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US20070188693A1 - Drive ic and display device having the same - Google Patents

Drive ic and display device having the same Download PDF

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Publication number
US20070188693A1
US20070188693A1 US11/738,009 US73800907A US2007188693A1 US 20070188693 A1 US20070188693 A1 US 20070188693A1 US 73800907 A US73800907 A US 73800907A US 2007188693 A1 US2007188693 A1 US 2007188693A1
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US
United States
Prior art keywords
bumps
drive
electrode terminals
aligned
adjacent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/738,009
Inventor
Seong-Yong Hwang
Sung-Chul Kang
Weon-Sik Oh
Cheol-Yong Jeong
Jin-Suk Lee
Ju-Young Yoon
Won-Gu Cho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US11/738,009 priority Critical patent/US20070188693A1/en
Publication of US20070188693A1 publication Critical patent/US20070188693A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • G—PHYSICS
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09372—Pads and lands
    • H05K2201/09409—Multiple rows of pads, lands, terminals or dummy patterns; Multiple rows of mounted components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09709—Staggered pads, lands or terminals; Parallel conductors in different planes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
    • H05K2201/10621—Components characterised by their electrical contacts
    • H05K2201/10674—Flip chip

Definitions

  • the present invention relates to a drive IC (Integrated Circuit) and a display device having the same, and more particularly to a drive IC having an electrically improved reliability and a display device having the same.
  • a drive IC Integrated Circuit
  • electronic instruments for example, such as a mobile communication terminal, a digital camera, a notebook computer, etc.
  • an image display device so as to display an image.
  • a flat panel display device representatively such as an LCD (Liquid Crystal Display) device, is mainly used.
  • the LCD device generally, includes a drive IC mounted on an LCD panel thereof.
  • a mobile communication terminal needs an LCD device having low power consumption and slim-type small size.
  • the LCD device having the slim-type small size is driven by means of a drive IC so-called one chip IC.
  • a drive IC so-called one chip IC.
  • COG Chip On Glass
  • the COG manner is a method that a drive IC is directly mounted on an LCD panel.
  • an ACF Anisotropic Conductive Film including a resin with a conductive ball is positioned on a plurality of electrode pads formed on the LCD panel and the drive IC is compressed with the electrode pads.
  • a plurality of bumps disposed under the drive IC is electrically connected to the electrode pads through the conductive ball.
  • the ACF is outwardly extruded from the drive IC due to compression of the drive IC while the drive IC is mounted on the LCD panel.
  • the conductive ball is moved to an outside of the drive IC with the resin and stacked up on a peripheral area of the bumps by colliding with bumps.
  • the bumps on which the conductive ball is stacked up may be electrically shorted to adjacent bumps. Also, since an adhesive force between the bumps and the conductive ball is deteriorated, an electrical connection between the drive IC and the electric pads may be opened.
  • the present invention provides a drive IC having an electrically improved reliability.
  • the present invention also provides a display device having the above drive IC.
  • a drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and aligned in a plurality of rows along a second direction perpendicular to the first direction, and bumps disposed on the electrode terminal.
  • a drive IC in another aspect of the invention, includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and bumps disposed on the electrode terminals.
  • the electrode terminals include first electrode terminals aligned in a first column and second electrode terminals aligned in a second column adjacent to the first column. Distances between adjacent two first electrode terminals are uniform and the second electrode terminals are positioned at areas corresponding to areas between the first electrode terminals aligned in the first column.
  • Each of the bumps has a predetermined length extended in a second direction perpendicular to the first direction.
  • the bumps include first bumps disposed on the first electrode terminals and second bumps disposed on the second electrode terminals.
  • the second bumps are separated from the first bumps and the separated distance between the first and second bumps is greater than a half of the predetermined length.
  • a display device includes a display panel and a drive IC electrically connected to the display panel.
  • the display panel includes a display area on which a gate line, a data line perpendicular to the gate line and a plurality of pixels are formed and a peripheral area on which electrode pads extended from the gate and data lines are formed.
  • the peripheral area is disposed adjacent to the display area.
  • the drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and aligned in a plurality of rows along a second direction perpendicular to the first direction and bumps disposed on the electrode terminal.
  • a display device includes a display panel and a drive IC electrically connected to the LCD panel.
  • the display panel includes a display area on which a gate line, a data line perpendicular to the gate line and a plurality of pixels are formed and a peripheral area on which electrode pads extended from the gate and data lines are formed.
  • the peripheral area is disposed adjacent to the display area.
  • the drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and bumps disposed on the electrode terminals.
  • the electrode terminals comprise first electrode terminals aligned in a first column and second electrode terminals aligned in a second column adjacent to the first column.
  • the distances between adjacent two first electrode terminals are uniform and the second electrode terminals are positioned at areas corresponding to areas between the first electrode terminals aligned in the first column.
  • Each of the bumps has a predetermined length extended in a second direction perpendicular to the first direction.
  • the bumps comprise first bumps disposed on the first electrode terminals and second bumps disposed on the second electrode terminals.
  • the second bumps are separated from the first bumps and the separated distance between the first and second bumps is greater than a half of the predetermined length.
  • bumps are disposed on a lower surface of the drive IC facing the display panel.
  • the bumps are sufficiently spaced apart from each other so as to allow an anisotropic conductive film to be smoothly flowed between the bumps.
  • conductive balls of the anisotropic conductive film is not stacked up on the peripheral area adjacent to the bumps, thereby preventing the bumps from being electrically connected to each other and an adhesive force between the drive IC and the display panel from being deteriorated.
  • FIG. 1 is a schematic plan view showing an LCD device having a drive IC according to an exemplary embodiment of the present invention
  • FIG. 2 is a schematic view showing a drive IC shown in FIG. 1 ;
  • FIGS. 3A and 3B are cross-sectional views showing a drive IC shown in FIG. 2 ;
  • FIG. 4 is an enlarged view showing a peripheral area of an LCD panel on which a drive IC is mounted shown in FIG. 2 ;
  • FIGS. 5A and 5B are cross-sectional views showing an LCD device shown in FIG. 1 ;
  • FIG. 6 is a partially enlarged view showing an energy loss due to bumps of a drive IC shown in FIG. 2 ;
  • FIGS. 7A to 7 F are schematic views showing bump shapes of a drive IC according to an exemplary embodiment of the present invention.
  • FIG. 8 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention.
  • FIG. 9 is a partially enlarged view showing a peripheral area of an LCD panel on which a drive IC is mounted shown in FIG. 8 ;
  • FIG. 10 is a partially enlarged view showing bumps of a drive IC shown in FIG. 8 ;
  • FIGS. 11A and 11B are partially enlarged views showing bump shapes of a drive IC according to another exemplary embodiment of the present invention.
  • FIG. 12 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention.
  • FIG. 13 is a partially enlarged view showing a peripheral area of an LCD panel on which a drive IC is mounted shown in FIG. 12 .
  • an LCD device will be described among various display devices in order to illustrate a drive IC and a display device having the same.
  • FIG. 1 is a schematic plan view showing an LCD device having a drive IC according to an exemplary embodiment of the present invention.
  • an LCD device 1000 includes a drive IC 100 and an LCD panel 200 on which the drive IC 100 is mounted.
  • the LCD panel 200 includes a TFT (Thin Film Transistor) substrate 300 , a color filter substrate 400 combined with the TFT substrate 300 and a liquid crystal layer (not shown) interposed between the TFT substrate 300 and the color filter substrate 400 .
  • TFT Thin Film Transistor
  • the LCD panel 200 further includes a sealant 600 disposed between the TFT substrate 300 and the color filter substrate 400 and positioned at an edge of the LCD panel 200 .
  • the sealant 600 combines the TFT substrate 300 with the color filter substrate 400 and prevents the liquid crystal interposed between the TFT substrate 300 and the color filter substrate 400 from leaking.
  • the LCD panel 200 is divided into a pixel area DA where the TFT substrate 300 is overlapped with the color filter substrate 400 so as to display an image and a peripheral area SA on which the drive IC 100 is mounted so as to drive the pixel area DA.
  • the TFT substrate 300 includes a plurality of gate lines 320 and a plurality of data lines 330 formed at the pixel area DA and perpendicular to each other.
  • the TFT substrate 300 also includes a plurality of input lines 310 formed at the peripheral area SA so as to receive a predetermined signal from an external.
  • the gate and data lines 320 and 330 extended from the pixel area DA are electrically connected to the drive IC 100 at the peripheral area SA.
  • the TFT substrate 300 may include a plurality of drive ICs formed at the peripheral area SA.
  • each of the drive ICs may be electrically connected to the gate and data lines.
  • FIG. 2 is a schematic view showing a drive IC shown in FIG. 1 .
  • FIG. 3A is a cross-sectional view taken along the line III-III′ for showing a structure of a drive IC shown in FIG. 2 and
  • FIG. 3B is a cross-sectional view taken along the line IV-IV′ for showing a drive IC shown in FIG. 2 .
  • the drive IC 100 includes a plurality of electrode terminals E I , E G and E D formed on a lower surface of a semiconductor substrate and a plurality of bumps B I , B G and B D formed on the electrode terminals E I , E G and E D .
  • a plurality of electrode terminals for input line E I (hereinafter, referred to as an input line electrode terminals)
  • a plurality of electrode terminals for gate line E G (hereinafter, referred to as a gate line electrode terminals)
  • a plurality of electrode terminals for data line E D (hereinafter, referred to as a data line electrode terminals) are formed on the lower surface of the drive IC 100 , which is facing the LCD panel 200 shown in FIG. 1 .
  • a plurality of bumps for the input line B I (hereinafter, referred to as an input line bumps), a plurality of bumps for the gate line B G (hereinafter, referred to as a gate line bumps) and a plurality of bumps for data line B D (hereinafter, referred to as a data line bumps) are disposed on the input line electrode terminals E I , gate line electrode terminals E G and data line electrode terminals E D , respectively.
  • the input line bumps B I are arranged along a first edge 100 a of the lower surface of the drive IC 100
  • the gate line bumps B G are arranged along second and third edges 100 b and 100 c positioned at both sides of the first edge 100 a
  • the data line bumps B D are arranged along a fourth edge 100 d parallel to the first edge 100 a.
  • the gate line bumps B G are arranged in two columns along the second and third edges 100 b and 100 c , respectively.
  • the gate line bumps B G arranged in different columns from each other and adjacent to each other are also juxtaposed in a direction parallel to the first edge 100 a of the drive IC 100 .
  • the data line bumps B D are arranged in two rows along the fourth edge 100 d and the data line bumps B D arranged in different rows from each other and adjacent to each other are also juxtaposed in a direction parallel to the second edge 100 b of the drive IC 100 .
  • the gate line bumps B G and the data line bumps B D of the drive IC 100 arranged in two columns or rows have been described.
  • the gate line bumps B G and the data line bumps B D may be arranged in three or more columns or rows, respectively.
  • a number of the input line bumps B I , gate line bumps B G and data line bumps B D may increase or decrease according to the LCD device 1000 .
  • FIG. 4 is an enlarged view showing a peripheral area of a liquid crystal display panel on which a drive IC is mounted shown in FIG. 2 .
  • the peripheral area SA of the LCD panel 200 is provided with a mounting area MA on which the drive IC 100 is mounted.
  • a plurality of input line electrode pads 310 a , a plurality of gate line electrode pads 320 a and a plurality of data line electrode pads 330 a are formed at the mounting area MA.
  • the input line electrode pads 310 a are connected to ends of the input lines 310 that receives the predetermined signal from the external, respectively, the gate line electrode pads 320 a are connected to ends of the gate lines 320 extended from the pixel area DA, respectively and the data line electrode pads 330 a are connected to ends of the data lines 330 extended from the pixel area DA, respectively.
  • the gate line electrode pads 320 have a width wider than that of the gate lines 320 , so that the gate line electrode pads 320 a are arranged in a plurality of columns so as to arrange the gate line electrode pads 320 a within the mounting area MA.
  • the gate line electrode pads 320 a are arranged at positions corresponding to the gate line bumps B G of the drive IC 100 shown in FIG. 2 . That is, the gate line electrode pads 320 a are arranged in two columns and the gate line electrode pads 320 a arranged in different columns from each other and adjacent to each other are also juxtaposed in a direction parallel to the first edge 100 a of the drive IC 100 .
  • the data line electrode pads 330 a are arranged at positions corresponding to the data line bumps B D of the drive IC 100 shown in FIG. 2 . That is, the data line electrode pads 330 a are arranged in two columns and the data line electrode pads 330 a arranged in different columns from each other and adjacent to each other are also juxtaposed in a direction parallel to the second edge 100 b of the drive IC 100 .
  • the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a arranged in the mounting area MA of the LCD panel 200 are electrically connected to the input line bumps B I , gate line bumps B G and data line bumps B D arranged in the drive IC 100 , respectively.
  • FIG. 5A is a cross-sectional view taken along the line I-I′ for showing an LCD device shown in FIG. 1
  • FIG. 5B is a cross-sectional view taken along the line II-II′ for showing an LCD device shown in FIG. 1 .
  • the LCD device 1000 includes the LCD panel 200 having the pixel and peripheral areas DA and SA and the drive IC 100 mounted on the peripheral area SA by means of a fixing member 700 .
  • the drive IC 100 is electrically connected to the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a arranged at the peripheral area SA of the LCD panel 200 by means of the fixing member 700 .
  • the fixing member 700 may include an ACF (Anisotropic Conductive Film), a non-conductive film or a solder.
  • ACF isotropic Conductive Film
  • the fixing member 700 including the ACF will be described and the ACF is represented by a reference numeral “ 700 ”.
  • the ACF 700 includes a conductive ball 710 and a resin 720 mixed with the conductive ball 710 and is disposed between the drive IC 100 and the LCD panel 200 .
  • the conductive ball 710 electrically connects the drive IC 100 to the LCD panel 200 and the resin 720 fixes the drive IC and the LCD panel 200 to each other.
  • the ACF 700 is coated over the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a of the LCD panel 200 .
  • the drive IC 100 on which the input line bumps B I , gate line bumps B G and data line bumps B D are mounted are compressed with the peripheral area SA such that the input line bumps B I , gate line bumps B G and data line bumps B D correspond to the input line electrode pads 310 a , gate line electrode pads 320 a and data line pads 330 a , respectively.
  • the input line bumps B I , gate line bumps B G and data line bumps B D of the drive IC 100 are electrically connected to the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a , respectively while the input line bumps B I , gate line bumps B G and data line bumps B D of the drive IC 100 compresses the conductive ball 710 .
  • the resin 720 has a reduced viscosity due to a high heat generated while the drive IC 100 is compressed with the peripheral area SA.
  • the resin 720 having the reduced viscosity is extruded outside the drive IC 100 with the conductive ball 710 that is not compressed between the drive IC 100 and LCD panel 200 and gradually hardened, thereby mounting the drive IC 100 on the peripheral area SA of the LCD panel 200 .
  • FIG. 6 is a partially enlarged view showing an energy loss due to bumps of a drive IC shown in FIG. 2 .
  • the gate line bumps B G or data line bumps B D shown in FIG. 2 will be described as an exemplary embodiment and represented by a reference numeral “B”.
  • the bumps “B” of the drive IC 100 are arranged in two rows and the bumps “B” arranged in different rows from each other and adjacent to each other are also juxtaposed in a direction perpendicular to a direction in which the bumps “B” are arranged.
  • the bumps “B” have a predetermined height (not shown) “H” and a first length L 1 , and the bumps “B”, which are arranged in a same row and adjacent to each other, are separated from each other with a first distance W 1 .
  • an inspection area CA is defined as shown in FIG. 6 .
  • the inspection area CA is defined by four bumps “B” adjacent to each other and provided with two inlets En and two outlets Ex.
  • An equation for frictional loss at a conventional duct having a rectangular shape is represented by the following equation (1).
  • E f 2( L/D e ) V 2 f+ 1 ⁇ 2 e f1 V 2 +1 ⁇ 2 e f2 V 2 (1)
  • E f is the frictional loss per unit mass of the ACF 700
  • L is a first length L 1 of the bumps “B”
  • De is an equivalent diameter
  • V is an average flow rate of the ACF 700 flowing inside the inspection area CA
  • f is a friction factor
  • e f1 is a loss coefficient (hereinafter, referred to as an entrance loss coefficient) at an entrance En of the inspection area CA
  • e f2 is a loss coefficient (hereinafter, referred to as an exit loss coefficient) at an exit Ex of the inspection area CA, respectively.
  • the frictional loss at the entrance En and the exit Ex is two times as large as the frictional loss represented by the above equation (1) because the inspection area CA has two entrances En and two exits Ex.
  • the frictional loss at exits arranged in a direction in which the bumps “B” are aligned is negligible quantity, the frictional loss at exits arranged in the direction in which the bumps “B” are aligned is not considered in this exemplary embodiment.
  • the equivalent diameter (De) is represent by the following equation (3).
  • Cd is a cross-sectional dimension
  • Pl is a peripheral length
  • L is a first length L 1 of the bumps “B”
  • W 1 is a distance between the bumps “B” arranged in a same column and adjacent to each other
  • H is a height of the bumps “B”, respectively.
  • FIGS. 7A to 7 F are schematic views showing various bump shapes of a drive IC according to an exemplary embodiment of the present invention.
  • the bumps “B” may have various shapes in order to reduce the frictional loss at the entrance En and the exit Ex as represented by the above equation (2).
  • corners of the bumps “B” that are adjacent to the entrance En are chamfered so as to reduce the frictional loss at the entrance En.
  • an entrance loss coefficient of the drive IC 100 shown in FIG. 7A is about one-sixth with respect to the entrance loss coefficient e f1 represented by the above equation (2), thereby reducing the frictional loss.
  • corners of the bumps “B” that are adjacent to the entrance En are rounded so as to reduce the frictional loss at the entrance En.
  • an entrance loss coefficient of the drive IC 100 shown in FIG. 7C is about one-third with respect to the entrance loss coefficient e f1 represented by the above equation (2), thereby reducing the frictional loss.
  • Entrance and exit loss coefficients of the drive IC 100 shown in FIG. 7D have a smaller value than the entrance and exit loss coefficients e f1 and e f2 represented by the above equation (2).
  • the drive IC 100 may have a bump having a circle shape, a pentagon, an octagon and so on so as to reduce the entrance and exit loss coefficients e f1 and e f2 .
  • the entrance loss coefficient En of the bumps “B” shown in FIGS. 7A to 7 F is set forth in “Transport Phenomena in Material Processing”, published in 1994 and written by D. R. Poirier and G. H. Geiger.
  • FIG. 8 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention.
  • a drive IC 100 includes a plurality of electrode terminals (not shown) formed on a lower surface thereof facing an LCD panel and a plurality of input line bumps B I , a plurality of gate line bumps B G and a plurality of data line bumps B D disposed on the input line electrode terminals (see FIG. 2 ), respectively.
  • the input line bumps B I are arranged along a first edge 100 a of the lower surface of the drive IC 100 .
  • the gate line bumps B G are arranged in two columns along second and third edges 100 b and 100 c of the drive IC 100 , respectively.
  • the gate line bumps B G arranged in different columns from each other are spaced apart from each other with a second distance W 2 .
  • the second distance W 2 is greater than a half of a length of the gate line bumps B G .
  • the gate line bumps B G arranged in a first column between the two columns are positioned at areas corresponding to spaces between the gate line bumps B G arranged in a second column between the two columns.
  • the data line bumps B D are arranged in two rows along a fourth edge 100 d parallel to the first edge 100 a and the data line bumps B D arranged in different rows from each other are spaced apart from each other with a third distance W 3 .
  • the third distance W 3 is greater than a half of a length of the data line bumps B D .
  • the data line bumps B D arranged in a first row between the two rows are positioned at areas corresponding to spaces between the data line bumps B D arranged in a second row between the two rows.
  • the gate line bumps B G and the data line bumps B D of the drive IC 100 arranged in two columns or rows have been described.
  • the gate line bumps B G and the data line bumps B D may be arranged in three or more columns or rows, respectively.
  • a number of the gate line bumps B G and data line bumps B D may increase or decrease according to the LCD device 1000 .
  • FIG. 9 is a partially enlarged view showing a peripheral area of a liquid crystal display panel on which a drive IC is mounted shown in FIG. 8 .
  • a peripheral area SA of the LCD panel 200 is provided with a mounting area MA on which the drive IC 100 is mounted shown in FIG. 8 .
  • a plurality of input line electrode pads 310 a , a plurality of gate line electrode pads 320 a and a plurality of data line electrode pads 330 a are formed at the mounting area MA.
  • the gate line electrode pads 320 a are arranged in two columns and the data line electrode pads 330 a are arranged in two columns within the mounting area MA.
  • the gate line electrode pads 320 a are arranged at positions corresponding to the gate line bumps B G of the drive IC 100 shown in FIG. 2 and the data line electrode pads 330 a are arranged at positions corresponding to the data line bumps B D of the drive IC 100 shown in FIG. 2 .
  • the gate line electrode pads 320 a arranged in a first column between the two columns are positioned at areas corresponding to spaces between the gate line electrode pads 320 a arranged in a second column between the two columns.
  • the data line electrode pads 330 a are arranged in a first column between the two columns are positioned at areas corresponding to spaces between the data line electrode pads 330 a arranged in a second column between the two columns.
  • FIG. 10 is a partially enlarged view showing bumps of a drive IC shown in FIG. 8 .
  • the gate line bumps B G or data line bumps B D shown in FIG. 8 will be described as an exemplary embodiment and represented by a reference numeral “B”.
  • the bumps “B” of the drive IC 100 are arranged in two rows and each of the bumps “B” has a second length L 2 in a direction perpendicular to a direction in which the bumps “B” are arranged.
  • the bumps “B”, which are arranged in a same row and adjacent to each other, are separated from each other with a predetermined distance and the bumps “B”, which are arranged in different rows, are spaced apart from each other with a fourth distance W 4 .
  • the fourth distance W 4 is greater than a half of the second length L 2 .
  • the ACF 700 is extruded through a space between the bumps “B” spaced apart from each other with the fourth distance W 4 . Also, a conductive ball 710 and a resin 720 mixed with the conductive ball 710 of the ACF 700 may be smoothly extruded outside the drive IC 100 , thereby preventing the conductive ball from stacking around the bumps “B”.
  • FIGS. 11A and 11B are partially enlarged views showing bump shapes of a drive IC according to another exemplary embodiment of the present invention.
  • the bumps “B” of the drive IC 100 are arranged in two rows and each of the bumps “B” has the second length L 2 in a direction perpendicular to a direction in which the bumps “B” are arranged.
  • the bumps “B”, which are arranged in different rows, are spaced apart from each other with a fourth distance W 4 .
  • the fourth distance W 4 is greater than a half of the second length L 2 .
  • corners of the bumps “B” that are adjacent to an entrance En are chamfered so as to reduce the frictional loss at the entrance En when the ACF 700 shown in FIG. 10 is flowed.
  • an angle ⁇ widened at the entrance En defined by the bumps “B” adjacent to each other is about 45 degrees and a depth of the widened entrance En is a half of a distance “d” between the bumps “B” adjacent to each other, the frictional loss at the entrance En may be reduced as described in FIG. 7A .
  • corners of the bumps “B” that are respectively adjacent to the entrance En and the exit Ex may be chamfered so as to reduce the frictional loss at the exit Ex with the frictional loss at the entrance En.
  • corners of the bumps “B” that are adjacent to an entrance En are rounded so as to reduce the frictional loss of the ACF 700 when the ACF 700 shown in FIG. 10 is flowed.
  • the frictional loss at the entrance En may be reduced as described in FIG. 7C .
  • corners of the bumps “B” that are respectively adjacent to the entrance En and the exit Ex may be rounded so as to reduce the frictional loss at the exit Ex with the frictional loss at the entrance En.
  • the bumps “B” may have various shapes, for example, such as a circle shape, a pentagon, a hexagon and an octagon and so on.
  • FIG. 12 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention.
  • a drive IC 100 includes a plurality of electrode terminals (not shown) formed on a lower surface thereof facing an LCD panel and a plurality of input line bumps B I , a plurality of gate line bumps B G and a plurality of data line bumps B D disposed on the input line electrode terminals, respectively.
  • the lower surface of the drive IC 100 is divided into an input line bump area D IA adjacent to a first edge 100 a thereof, a gate line bump area G OA adjacent to a second edge 100 b thereof and a data line bump area D OA adjacent to a third edge 100 c thereof.
  • the input line bumps B I are arranged in an entire are of the input line bump area D IA along the first edge 100 a and the input line bumps B I are arranged in two rows.
  • the gate line bumps B G are arranged in an entire are of the gate line bump area G OA along the second and third edges 100 b and 100 c , respectively.
  • the gate line bumps B G are arranged in three columns.
  • the data line bumps B D are arranged in an entire area of the data line bump area D OA along the fourth edge 100 d and the data line bumps B D are arranged in four rows.
  • the input line bumps B I , gate line bumps B G and data line bumps B D may be sufficiently spaced apart from each other since the input line bumps B I , gate line bumps B G and data line bumps B D are arranged in the entire areas of the input line bump area D IA , gate line bump area G OA and data line bump area D OA .
  • the input line bumps B I , gate line bumps B G and the data line bumps B D of the drive IC 100 arranged in two, three and four columns or rows have been described. However, a number of the input line bumps B I , gate line bumps B G and data line bumps B D may increase or decrease according to the LCD device 1000 .
  • FIG. 13 is a partially enlarged view showing a peripheral area of a liquid crystal display panel on which a drive IC is mounted shown in FIG. 12 .
  • a peripheral area SA of the LCD panel 200 is provided with a mounting area MA on which the drive IC 100 shown in FIG. 12 is mounted.
  • a plurality of input line electrode pads 310 a , a plurality of gate line electrode pads 320 a and a plurality of data line electrode pads 330 a are formed at the mounting area MA.
  • the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a are arranged in a plurality of columns or rows within the mounting area MA.
  • the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a are arranged at positions corresponding to the input line bumps B I , gate line bumps B G and data line bumps B D , respectively. Therefore, an arrangement of the input line electrode pads 310 a , gate line electrode pads 320 a and data line electrode pads 330 a will not be described in detail.
  • the drive IC 100 is mounted on the LCD panel 200 using the ACF 700 and the input line bumps B I , gate line bumps B G and data line bumps B D are sufficiently spaced apart from each other, the ACF 700 may be smoothly flowed outside the drive IC 100 .
  • the ACF 700 is not stacked up on the peripheral area of the input line bumps B I , gate line bumps B G and data line bumps B D , thereby improving an electrical reliability between the drive IC 100 and the LCD panel 200 .
  • the drive IC 100 may be applied to an LCD device having the slim-type small size and an LCD device having an LCD panel that gate and data printed circuit boards are positioned at a peripheral area adjacent to the LCD panel.
  • the LCD device 1000 having the LCD panel 200 has been described.
  • the drive IC 100 according to those exemplary embodiments of the present invention may be applied to a display device of an organic electro-luminescence or a display device of a plasma display panel.

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Abstract

In a drive IC and a display device having the same, the drive IC includes a plurality of bumps disposed on a lower surface of the drive IC and aligned in a plurality of rows along an edge of the drive IC. The bumps aligned in different rows from each other are juxtaposed in a direction perpendicular to a direction in which the bumps are aligned. Accordingly, when the drive IC is mounted on a display panel using an anisotropic conductive film, the anisotropic conductive film may be smoothly flowed through a space defined by the bumps of the drive IC, thereby improving electric properties of the drive IC and display device.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application relies for priority upon Korean Patent Application No. 2003-10819 filed on Feb. 20, 2003, the contents of which are herein incorporated by reference in its entirety.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a drive IC (Integrated Circuit) and a display device having the same, and more particularly to a drive IC having an electrically improved reliability and a display device having the same.
  • 2. Description of the Related Art
  • Recently, electronic instruments, for example, such as a mobile communication terminal, a digital camera, a notebook computer, etc., include an image display device so as to display an image. As an image display device, a flat panel display device, representatively such as an LCD (Liquid Crystal Display) device, is mainly used.
  • The LCD device, generally, includes a drive IC mounted on an LCD panel thereof. Particularly, a mobile communication terminal needs an LCD device having low power consumption and slim-type small size.
  • The LCD device having the slim-type small size is driven by means of a drive IC so-called one chip IC. In recent, an LCD device to which a COG (Chip On Glass) manner is applied is broadly used. The COG manner is a method that a drive IC is directly mounted on an LCD panel.
  • In the LCD panel to which the COG manner is applied, an ACF (Anisotropic Conductive Film) including a resin with a conductive ball is positioned on a plurality of electrode pads formed on the LCD panel and the drive IC is compressed with the electrode pads. A plurality of bumps disposed under the drive IC is electrically connected to the electrode pads through the conductive ball.
  • The ACF is outwardly extruded from the drive IC due to compression of the drive IC while the drive IC is mounted on the LCD panel. However, the conductive ball is moved to an outside of the drive IC with the resin and stacked up on a peripheral area of the bumps by colliding with bumps.
  • As a result, the bumps on which the conductive ball is stacked up may be electrically shorted to adjacent bumps. Also, since an adhesive force between the bumps and the conductive ball is deteriorated, an electrical connection between the drive IC and the electric pads may be opened.
    • BRIEF SUMMARY OF THE INVENTION
  • The present invention provides a drive IC having an electrically improved reliability.
  • The present invention also provides a display device having the above drive IC.
  • In one aspect of the invention, a drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and aligned in a plurality of rows along a second direction perpendicular to the first direction, and bumps disposed on the electrode terminal.
  • In another aspect of the invention, a drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and bumps disposed on the electrode terminals. The electrode terminals include first electrode terminals aligned in a first column and second electrode terminals aligned in a second column adjacent to the first column. Distances between adjacent two first electrode terminals are uniform and the second electrode terminals are positioned at areas corresponding to areas between the first electrode terminals aligned in the first column.
  • Each of the bumps has a predetermined length extended in a second direction perpendicular to the first direction. The bumps include first bumps disposed on the first electrode terminals and second bumps disposed on the second electrode terminals. The second bumps are separated from the first bumps and the separated distance between the first and second bumps is greater than a half of the predetermined length.
  • In further aspect of the invention, a display device includes a display panel and a drive IC electrically connected to the display panel.
  • The display panel includes a display area on which a gate line, a data line perpendicular to the gate line and a plurality of pixels are formed and a peripheral area on which electrode pads extended from the gate and data lines are formed. The peripheral area is disposed adjacent to the display area.
  • The drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and aligned in a plurality of rows along a second direction perpendicular to the first direction and bumps disposed on the electrode terminal.
  • In further aspect of the invention, a display device includes a display panel and a drive IC electrically connected to the LCD panel.
  • The display panel includes a display area on which a gate line, a data line perpendicular to the gate line and a plurality of pixels are formed and a peripheral area on which electrode pads extended from the gate and data lines are formed. The peripheral area is disposed adjacent to the display area.
  • The drive IC includes electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and bumps disposed on the electrode terminals.
  • The electrode terminals comprise first electrode terminals aligned in a first column and second electrode terminals aligned in a second column adjacent to the first column. The distances between adjacent two first electrode terminals are uniform and the second electrode terminals are positioned at areas corresponding to areas between the first electrode terminals aligned in the first column.
  • Each of the bumps has a predetermined length extended in a second direction perpendicular to the first direction. The bumps comprise first bumps disposed on the first electrode terminals and second bumps disposed on the second electrode terminals. The second bumps are separated from the first bumps and the separated distance between the first and second bumps is greater than a half of the predetermined length.
  • According to the drive IC and the display device having the same, bumps are disposed on a lower surface of the drive IC facing the display panel. The bumps are sufficiently spaced apart from each other so as to allow an anisotropic conductive film to be smoothly flowed between the bumps.
  • Thus, conductive balls of the anisotropic conductive film is not stacked up on the peripheral area adjacent to the bumps, thereby preventing the bumps from being electrically connected to each other and an adhesive force between the drive IC and the display panel from being deteriorated.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The above and other advantages of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:
  • FIG. 1 is a schematic plan view showing an LCD device having a drive IC according to an exemplary embodiment of the present invention;
  • FIG. 2 is a schematic view showing a drive IC shown in FIG. 1;
  • FIGS. 3A and 3B are cross-sectional views showing a drive IC shown in FIG. 2;
  • FIG. 4 is an enlarged view showing a peripheral area of an LCD panel on which a drive IC is mounted shown in FIG. 2;
  • FIGS. 5A and 5B are cross-sectional views showing an LCD device shown in FIG. 1;
  • FIG. 6 is a partially enlarged view showing an energy loss due to bumps of a drive IC shown in FIG. 2;
  • FIGS. 7A to 7F are schematic views showing bump shapes of a drive IC according to an exemplary embodiment of the present invention;
  • FIG. 8 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention;
  • FIG. 9 is a partially enlarged view showing a peripheral area of an LCD panel on which a drive IC is mounted shown in FIG. 8;
  • FIG. 10 is a partially enlarged view showing bumps of a drive IC shown in FIG. 8;
  • FIGS. 11A and 11B are partially enlarged views showing bump shapes of a drive IC according to another exemplary embodiment of the present invention;
  • FIG. 12 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention; and
  • FIG. 13 is a partially enlarged view showing a peripheral area of an LCD panel on which a drive IC is mounted shown in FIG. 12.
    • DETAILED DESCRIPTION OF THE INVENTION
  • In exemplary embodiments of the present invention, an LCD device will be described among various display devices in order to illustrate a drive IC and a display device having the same.
  • FIG. 1 is a schematic plan view showing an LCD device having a drive IC according to an exemplary embodiment of the present invention.
  • Referring to FIG. 1, an LCD device 1000 includes a drive IC 100 and an LCD panel 200 on which the drive IC 100 is mounted.
  • The LCD panel 200 includes a TFT (Thin Film Transistor) substrate 300, a color filter substrate 400 combined with the TFT substrate 300 and a liquid crystal layer (not shown) interposed between the TFT substrate 300 and the color filter substrate 400.
  • The LCD panel 200 further includes a sealant 600 disposed between the TFT substrate 300 and the color filter substrate 400 and positioned at an edge of the LCD panel 200. The sealant 600 combines the TFT substrate 300 with the color filter substrate 400 and prevents the liquid crystal interposed between the TFT substrate 300 and the color filter substrate 400 from leaking.
  • The LCD panel 200 is divided into a pixel area DA where the TFT substrate 300 is overlapped with the color filter substrate 400 so as to display an image and a peripheral area SA on which the drive IC 100 is mounted so as to drive the pixel area DA.
  • The TFT substrate 300 includes a plurality of gate lines 320 and a plurality of data lines 330 formed at the pixel area DA and perpendicular to each other. The TFT substrate 300 also includes a plurality of input lines 310 formed at the peripheral area SA so as to receive a predetermined signal from an external. The gate and data lines 320 and 330 extended from the pixel area DA are electrically connected to the drive IC 100 at the peripheral area SA.
  • Although not shown in FIG. 1, the TFT substrate 300 may include a plurality of drive ICs formed at the peripheral area SA. In this case, each of the drive ICs may be electrically connected to the gate and data lines.
  • FIG. 2 is a schematic view showing a drive IC shown in FIG. 1. FIG. 3A is a cross-sectional view taken along the line III-III′ for showing a structure of a drive IC shown in FIG. 2 and FIG. 3B is a cross-sectional view taken along the line IV-IV′ for showing a drive IC shown in FIG. 2.
  • Referring to FIGS. 2 to 3B, the drive IC 100 includes a plurality of electrode terminals EI, EG and ED formed on a lower surface of a semiconductor substrate and a plurality of bumps BI, BG and BD formed on the electrode terminals EI, EG and ED. Particularly, a plurality of electrode terminals for input line EI (hereinafter, referred to as an input line electrode terminals) a plurality of electrode terminals for gate line EG (hereinafter, referred to as a gate line electrode terminals) and a plurality of electrode terminals for data line ED (hereinafter, referred to as a data line electrode terminals) are formed on the lower surface of the drive IC 100, which is facing the LCD panel 200 shown in FIG. 1. Also, a plurality of bumps for the input line BI (hereinafter, referred to as an input line bumps), a plurality of bumps for the gate line BG (hereinafter, referred to as a gate line bumps) and a plurality of bumps for data line BD (hereinafter, referred to as a data line bumps) are disposed on the input line electrode terminals EI, gate line electrode terminals EG and data line electrode terminals ED, respectively.
  • The input line bumps BI are arranged along a first edge 100 a of the lower surface of the drive IC 100, the gate line bumps BG are arranged along second and third edges 100 b and 100 c positioned at both sides of the first edge 100 a, and the data line bumps BD are arranged along a fourth edge 100 d parallel to the first edge 100 a.
  • The gate line bumps BG are arranged in two columns along the second and third edges 100 b and 100 c, respectively. The gate line bumps BG arranged in different columns from each other and adjacent to each other are also juxtaposed in a direction parallel to the first edge 100 a of the drive IC 100. The data line bumps BD are arranged in two rows along the fourth edge 100 d and the data line bumps BD arranged in different rows from each other and adjacent to each other are also juxtaposed in a direction parallel to the second edge 100 b of the drive IC 100.
  • In FIG. 2, the gate line bumps BG and the data line bumps BD of the drive IC 100 arranged in two columns or rows have been described. However, the gate line bumps BG and the data line bumps BD may be arranged in three or more columns or rows, respectively. Also, a number of the input line bumps BI, gate line bumps BG and data line bumps BD may increase or decrease according to the LCD device 1000.
  • FIG. 4 is an enlarged view showing a peripheral area of a liquid crystal display panel on which a drive IC is mounted shown in FIG. 2.
  • Referring to FIG. 4, the peripheral area SA of the LCD panel 200 is provided with a mounting area MA on which the drive IC 100 is mounted.
  • A plurality of input line electrode pads 310 a, a plurality of gate line electrode pads 320 a and a plurality of data line electrode pads 330 a are formed at the mounting area MA.
  • The input line electrode pads 310 a are connected to ends of the input lines 310 that receives the predetermined signal from the external, respectively, the gate line electrode pads 320 a are connected to ends of the gate lines 320 extended from the pixel area DA, respectively and the data line electrode pads 330 a are connected to ends of the data lines 330 extended from the pixel area DA, respectively.
  • The gate line electrode pads 320 have a width wider than that of the gate lines 320, so that the gate line electrode pads 320 a are arranged in a plurality of columns so as to arrange the gate line electrode pads 320 a within the mounting area MA.
  • In FIG. 4, the gate line electrode pads 320 a are arranged at positions corresponding to the gate line bumps BG of the drive IC 100 shown in FIG. 2. That is, the gate line electrode pads 320 a are arranged in two columns and the gate line electrode pads 320 a arranged in different columns from each other and adjacent to each other are also juxtaposed in a direction parallel to the first edge 100 a of the drive IC 100.
  • Also, the data line electrode pads 330 a are arranged at positions corresponding to the data line bumps BD of the drive IC 100 shown in FIG. 2. That is, the data line electrode pads 330 a are arranged in two columns and the data line electrode pads 330 a arranged in different columns from each other and adjacent to each other are also juxtaposed in a direction parallel to the second edge 100 b of the drive IC 100.
  • Thus, the input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a arranged in the mounting area MA of the LCD panel 200 are electrically connected to the input line bumps BI, gate line bumps BG and data line bumps BD arranged in the drive IC 100, respectively.
  • FIG. 5A is a cross-sectional view taken along the line I-I′ for showing an LCD device shown in FIG. 1 and FIG. 5B is a cross-sectional view taken along the line II-II′ for showing an LCD device shown in FIG. 1.
  • Referring to FIGS. 5A and 5B, the LCD device 1000 includes the LCD panel 200 having the pixel and peripheral areas DA and SA and the drive IC 100 mounted on the peripheral area SA by means of a fixing member 700.
  • The drive IC 100 is electrically connected to the input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a arranged at the peripheral area SA of the LCD panel 200 by means of the fixing member 700.
  • The fixing member 700 may include an ACF (Anisotropic Conductive Film), a non-conductive film or a solder. In this exemplary embodiment, the fixing member 700 including the ACF will be described and the ACF is represented by a reference numeral “700”.
  • The ACF 700 includes a conductive ball 710 and a resin 720 mixed with the conductive ball 710 and is disposed between the drive IC 100 and the LCD panel 200. The conductive ball 710 electrically connects the drive IC 100 to the LCD panel 200 and the resin 720 fixes the drive IC and the LCD panel 200 to each other.
  • Hereinafter, a manner for mounting the drive IC 100 on the LCD panel 200 will be described.
  • The ACF 700 is coated over the input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a of the LCD panel 200.
  • The drive IC 100 on which the input line bumps BI, gate line bumps BG and data line bumps BD are mounted are compressed with the peripheral area SA such that the input line bumps BI, gate line bumps BG and data line bumps BD correspond to the input line electrode pads 310 a, gate line electrode pads 320 a and data line pads 330 a, respectively.
  • Thus, the input line bumps BI, gate line bumps BG and data line bumps BD of the drive IC 100 are electrically connected to the input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a, respectively while the input line bumps BI, gate line bumps BG and data line bumps BD of the drive IC 100 compresses the conductive ball 710.
  • The resin 720 has a reduced viscosity due to a high heat generated while the drive IC 100 is compressed with the peripheral area SA. The resin 720 having the reduced viscosity is extruded outside the drive IC 100 with the conductive ball 710 that is not compressed between the drive IC 100 and LCD panel 200 and gradually hardened, thereby mounting the drive IC 100 on the peripheral area SA of the LCD panel 200.
  • FIG. 6 is a partially enlarged view showing an energy loss due to bumps of a drive IC shown in FIG. 2. In FIG. 6, the gate line bumps BG or data line bumps BD shown in FIG. 2 will be described as an exemplary embodiment and represented by a reference numeral “B”.
  • Referring to FIG. 6, the bumps “B” of the drive IC 100 are arranged in two rows and the bumps “B” arranged in different rows from each other and adjacent to each other are also juxtaposed in a direction perpendicular to a direction in which the bumps “B” are arranged. The bumps “B” have a predetermined height (not shown) “H” and a first length L1, and the bumps “B”, which are arranged in a same row and adjacent to each other, are separated from each other with a first distance W1.
  • When the drive IC 100 is mounted on the LCD panel 200 using the ACF 700 shown in FIGS. 5A and 5B, the ACF 700 is extruded outside the drive IC 100 due to the compression of the drive IC 100.
  • In order to consider a frictional loss per unit mass due to the bump “B” when the ACF 700 is extruded outside the drive IC 100, an inspection area CA is defined as shown in FIG. 6.
  • The inspection area CA is defined by four bumps “B” adjacent to each other and provided with two inlets En and two outlets Ex. An equation for frictional loss at a conventional duct having a rectangular shape is represented by the following equation (1).
    E f=2(L/D e)V 2 f+½e f1 V 2+½e f2 V 2  (1)
  • Assuming that the inspection area CA defined by the bumps “B” of the drive IC 100 mounted on the LCD panel 200 is the rectangular-shaped duct, the frictional loss per unit mass of the ACF 700 is represented by the following equation (2)
    E f=2(L/D e)V 2 f+2*½e f1 V 2+2*½e f2 V 2  (2)
  • In the above equation (2), Ef is the frictional loss per unit mass of the ACF 700, L is a first length L1 of the bumps “B”, De is an equivalent diameter, V is an average flow rate of the ACF 700 flowing inside the inspection area CA, f is a friction factor, ef1 is a loss coefficient (hereinafter, referred to as an entrance loss coefficient) at an entrance En of the inspection area CA and ef2 is a loss coefficient (hereinafter, referred to as an exit loss coefficient) at an exit Ex of the inspection area CA, respectively.
  • The frictional loss at the entrance En and the exit Ex is two times as large as the frictional loss represented by the above equation (1) because the inspection area CA has two entrances En and two exits Ex. In the inspection area CA, since frictional loss at exits arranged in a direction in which the bumps “B” are aligned is negligible quantity, the frictional loss at exits arranged in the direction in which the bumps “B” are aligned is not considered in this exemplary embodiment.
  • The equivalent diameter (De) is represent by the following equation (3).
    De=(4*Cd)/Pl=4*(W 1*2L)/2*(W 1 +H)  (3)
  • In the above equation (3), Cd is a cross-sectional dimension, Pl is a peripheral length, L is a first length L1 of the bumps “B”, W1 is a distance between the bumps “B” arranged in a same column and adjacent to each other and H is a height of the bumps “B”, respectively.
  • Accordingly, the frictional loss per unit mass of the ACF 700 flowing inside a space formed by the bumps “B” using the above equations (2) and (3).
  • FIGS. 7A to 7F are schematic views showing various bump shapes of a drive IC according to an exemplary embodiment of the present invention.
  • Referring to FIGS. 7A to 7F, the bumps “B” may have various shapes in order to reduce the frictional loss at the entrance En and the exit Ex as represented by the above equation (2).
  • In the drive IC 100 shown in FIG. 7A, corners of the bumps “B” that are adjacent to the entrance En are chamfered so as to reduce the frictional loss at the entrance En.
  • For example, assuming that an angle θ widened at the entrance En defined by the bumps “B” adjacent to each other is about 45 degrees and a depth of the widened entrance En is a half of a distance “d” between the bumps “B” adjacent to each other, an entrance loss coefficient of the drive IC 100 shown in FIG. 7A is about one-sixth with respect to the entrance loss coefficient ef1 represented by the above equation (2), thereby reducing the frictional loss.
  • In the drive IC 100 shown in FIG. 7B, corners of the bumps “B” that are respectively adjacent to the entrance En and the exit Ex are chamfered. Entrance and exit loss coefficients of the drive IC 100 shown in FIG. 7B have a smaller value than the entrance and exit loss coefficients ef1 and ef2 represented by the above equation (2).
  • In the drive IC 100 shown in FIG. 7C, corners of the bumps “B” that are adjacent to the entrance En are rounded so as to reduce the frictional loss at the entrance En.
  • For example, when a radius of curvature “r” of the rounded corners and a distance “d” between the bumps “B” adjacent to each other is satisfied a condition of r/d=0.1, an entrance loss coefficient of the drive IC 100 shown in FIG. 7C is about one-third with respect to the entrance loss coefficient ef1 represented by the above equation (2), thereby reducing the frictional loss.
  • In the drive IC 100 shown in FIG. 7D, corners of the bumps “B” that are respectively adjacent to the entrance En and the exit Ex are rounded. Thus, Entrance and exit loss coefficients of the drive IC 100 shown in FIG. 7D have a smaller value than the entrance and exit loss coefficients ef1 and ef2 represented by the above equation (2).
  • Also, since the drive IC 100 shown in FIG. 7E has an oval shape and the drive IC 100 shown in FIG. 7F has a hexagon when viewed from an upper side of the drive IC 100, entrance and exit loss coefficients of the drive IC 100 shown in FIGS. 7E and 7F have a smaller value than the entrance and exit loss coefficients ef1 and ef2 represented by the above equation (2).
  • Although not shown in FIGS. 7A to 7F, the drive IC 100 may have a bump having a circle shape, a pentagon, an octagon and so on so as to reduce the entrance and exit loss coefficients ef1 and ef2.
  • The entrance loss coefficient En of the bumps “B” shown in FIGS. 7A to 7F is set forth in “Transport Phenomena in Material Processing”, published in 1994 and written by D. R. Poirier and G. H. Geiger.
  • FIG. 8 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention.
  • Referring to FIG. 8, a drive IC 100 includes a plurality of electrode terminals (not shown) formed on a lower surface thereof facing an LCD panel and a plurality of input line bumps BI, a plurality of gate line bumps BG and a plurality of data line bumps BD disposed on the input line electrode terminals (see FIG. 2), respectively.
  • The input line bumps BI are arranged along a first edge 100 a of the lower surface of the drive IC 100.
  • The gate line bumps BG are arranged in two columns along second and third edges 100 b and 100 c of the drive IC 100, respectively. The gate line bumps BG arranged in different columns from each other are spaced apart from each other with a second distance W2. The second distance W2 is greater than a half of a length of the gate line bumps BG. Also, the gate line bumps BG arranged in a first column between the two columns are positioned at areas corresponding to spaces between the gate line bumps BG arranged in a second column between the two columns.
  • The data line bumps BD are arranged in two rows along a fourth edge 100 d parallel to the first edge 100 a and the data line bumps BD arranged in different rows from each other are spaced apart from each other with a third distance W3. The third distance W3 is greater than a half of a length of the data line bumps BD. Also, the data line bumps BD arranged in a first row between the two rows are positioned at areas corresponding to spaces between the data line bumps BD arranged in a second row between the two rows.
  • In FIG. 8, the gate line bumps BG and the data line bumps BD of the drive IC 100 arranged in two columns or rows have been described. However, the gate line bumps BG and the data line bumps BD may be arranged in three or more columns or rows, respectively. Also, a number of the gate line bumps BG and data line bumps BD may increase or decrease according to the LCD device 1000.
  • FIG. 9 is a partially enlarged view showing a peripheral area of a liquid crystal display panel on which a drive IC is mounted shown in FIG. 8.
  • Referring to FIG. 9, a peripheral area SA of the LCD panel 200 is provided with a mounting area MA on which the drive IC 100 is mounted shown in FIG. 8.
  • A plurality of input line electrode pads 310 a, a plurality of gate line electrode pads 320 a and a plurality of data line electrode pads 330 a are formed at the mounting area MA.
  • The gate line electrode pads 320 a are arranged in two columns and the data line electrode pads 330 a are arranged in two columns within the mounting area MA.
  • The gate line electrode pads 320 a are arranged at positions corresponding to the gate line bumps BG of the drive IC 100 shown in FIG. 2 and the data line electrode pads 330 a are arranged at positions corresponding to the data line bumps BD of the drive IC 100 shown in FIG. 2.
  • That is, the gate line electrode pads 320 a arranged in a first column between the two columns are positioned at areas corresponding to spaces between the gate line electrode pads 320 a arranged in a second column between the two columns.
  • The data line electrode pads 330 a are arranged in a first column between the two columns are positioned at areas corresponding to spaces between the data line electrode pads 330 a arranged in a second column between the two columns.
  • FIG. 10 is a partially enlarged view showing bumps of a drive IC shown in FIG. 8. In FIG. 10, the gate line bumps BG or data line bumps BD shown in FIG. 8 will be described as an exemplary embodiment and represented by a reference numeral “B”.
  • Referring to FIG. 10, the bumps “B” of the drive IC 100 are arranged in two rows and each of the bumps “B” has a second length L2 in a direction perpendicular to a direction in which the bumps “B” are arranged. The bumps “B”, which are arranged in a same row and adjacent to each other, are separated from each other with a predetermined distance and the bumps “B”, which are arranged in different rows, are spaced apart from each other with a fourth distance W4. The fourth distance W4 is greater than a half of the second length L2.
  • When the drive IC 100 is mounted on the LCD panel 200 using the ACF 700 as shown in FIGS. 5A and 5B, the ACF 700 is extruded outside the drive IC 100 due to the compression of the drive IC 100.
  • The ACF 700 is extruded through a space between the bumps “B” spaced apart from each other with the fourth distance W4. Also, a conductive ball 710 and a resin 720 mixed with the conductive ball 710 of the ACF 700 may be smoothly extruded outside the drive IC 100, thereby preventing the conductive ball from stacking around the bumps “B”.
  • FIGS. 11A and 11B are partially enlarged views showing bump shapes of a drive IC according to another exemplary embodiment of the present invention.
  • Referring to FIGS. 11A and 11B, the bumps “B” of the drive IC 100 are arranged in two rows and each of the bumps “B” has the second length L2 in a direction perpendicular to a direction in which the bumps “B” are arranged. The bumps “B”, which are arranged in different rows, are spaced apart from each other with a fourth distance W4. The fourth distance W4 is greater than a half of the second length L2.
  • In the drive IC 100 shown in FIG. 11A, corners of the bumps “B” that are adjacent to an entrance En are chamfered so as to reduce the frictional loss at the entrance En when the ACF 700 shown in FIG. 10 is flowed.
  • For example, assuming that an angle θ widened at the entrance En defined by the bumps “B” adjacent to each other is about 45 degrees and a depth of the widened entrance En is a half of a distance “d” between the bumps “B” adjacent to each other, the frictional loss at the entrance En may be reduced as described in FIG. 7A.
  • Although not shown in FIG. 11A, corners of the bumps “B” that are respectively adjacent to the entrance En and the exit Ex (not shown) may be chamfered so as to reduce the frictional loss at the exit Ex with the frictional loss at the entrance En.
  • In the drive IC 100 shown in FIG. 11B, corners of the bumps “B” that are adjacent to an entrance En are rounded so as to reduce the frictional loss of the ACF 700 when the ACF 700 shown in FIG. 10 is flowed.
  • For example, when a radius of curvature “r” of the rounded corners and a distance “d” between the bumps “B” arranged in a same row and adjacent to each other is satisfied a condition of r/d=0.1, the frictional loss at the entrance En may be reduced as described in FIG. 7C.
  • Although not shown in FIG. 11B, corners of the bumps “B” that are respectively adjacent to the entrance En and the exit Ex (not shown) may be rounded so as to reduce the frictional loss at the exit Ex with the frictional loss at the entrance En.
  • Also, in order to reduce the frictional loss at the entrance En and the exit Ex, the bumps “B” may have various shapes, for example, such as a circle shape, a pentagon, a hexagon and an octagon and so on.
  • FIG. 12 is a schematic view showing a drive IC according to another exemplary embodiment of the present invention.
  • Referring to FIG. 12, a drive IC 100 includes a plurality of electrode terminals (not shown) formed on a lower surface thereof facing an LCD panel and a plurality of input line bumps BI, a plurality of gate line bumps BG and a plurality of data line bumps BD disposed on the input line electrode terminals, respectively.
  • The lower surface of the drive IC 100 is divided into an input line bump area DIA adjacent to a first edge 100 a thereof, a gate line bump area GOA adjacent to a second edge 100 b thereof and a data line bump area DOA adjacent to a third edge 100 c thereof.
  • The input line bumps BI are arranged in an entire are of the input line bump area DIA along the first edge 100 a and the input line bumps BI are arranged in two rows.
  • The gate line bumps BG are arranged in an entire are of the gate line bump area GOA along the second and third edges 100 b and 100 c, respectively. The gate line bumps BG are arranged in three columns.
  • The data line bumps BD are arranged in an entire area of the data line bump area DOA along the fourth edge 100 d and the data line bumps BD are arranged in four rows.
  • As the above described, the input line bumps BI, gate line bumps BG and data line bumps BD may be sufficiently spaced apart from each other since the input line bumps BI, gate line bumps BG and data line bumps BD are arranged in the entire areas of the input line bump area DIA, gate line bump area GOA and data line bump area DOA.
  • In FIG. 12, the input line bumps BI, gate line bumps BG and the data line bumps BD of the drive IC 100 arranged in two, three and four columns or rows have been described. However, a number of the input line bumps BI, gate line bumps BG and data line bumps BD may increase or decrease according to the LCD device 1000.
  • FIG. 13 is a partially enlarged view showing a peripheral area of a liquid crystal display panel on which a drive IC is mounted shown in FIG. 12.
  • Referring to FIG. 13, a peripheral area SA of the LCD panel 200 is provided with a mounting area MA on which the drive IC 100 shown in FIG. 12 is mounted.
  • A plurality of input line electrode pads 310 a, a plurality of gate line electrode pads 320 a and a plurality of data line electrode pads 330 a are formed at the mounting area MA.
  • The input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a are arranged in a plurality of columns or rows within the mounting area MA.
  • The input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a are arranged at positions corresponding to the input line bumps BI, gate line bumps BG and data line bumps BD, respectively. Therefore, an arrangement of the input line electrode pads 310 a, gate line electrode pads 320 a and data line electrode pads 330 a will not be described in detail.
  • Similarly, since the drive IC 100 is mounted on the LCD panel 200 using the ACF 700 and the input line bumps BI, gate line bumps BG and data line bumps BD are sufficiently spaced apart from each other, the ACF 700 may be smoothly flowed outside the drive IC 100.
  • Thus, the ACF 700 is not stacked up on the peripheral area of the input line bumps BI, gate line bumps BG and data line bumps BD, thereby improving an electrical reliability between the drive IC 100 and the LCD panel 200.
  • The drive IC 100 according to those exemplary embodiments of the present invention may be applied to an LCD device having the slim-type small size and an LCD device having an LCD panel that gate and data printed circuit boards are positioned at a peripheral area adjacent to the LCD panel.
  • Furthermore, in order to describe the drive IC according to those exemplary embodiments of the present invention, the LCD device 1000 having the LCD panel 200 has been described. However, the drive IC 100 according to those exemplary embodiments of the present invention may be applied to a display device of an organic electro-luminescence or a display device of a plasma display panel.
  • Although the exemplary embodiments of the present invention have been described, it is understood that the present invention should not be limited to these exemplary embodiments but various changes and modifications can be made by one ordinary skilled in the art within the spirit and scope of the present invention as hereinafter claimed.

Claims (22)

1-3. (canceled)
4. A circuit device comprising:
electrode terminals linearly aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and linearly aligned in a plurality of rows along a second direction perpendicular to the first direction; and
bumps disposed on the electrode terminal,
wherein distances between adjacent two electrode terminals aligned in the second direction from respective adjacent columns are uniform, and each of the bumps has at least one chamfered corner portion.
5. The circuit device of claim 4, wherein each of the bumps has at least one rounded corner portion.
6. (canceled)
7. A circuit device comprising:
electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate;
bumps disposed on the electrode terminals,
wherein the electrode terminals comprise first electrode terminals aligned in a first column and second electrode terminals aligned in a second column adjacent to the first column, distances between adjacent two first electrode terminals are uniform and the second electrode terminals are positioned at areas corresponding to areas between the first electrode terminals aligned in the first column.
8. The circuit device of claim 7, wherein each of the bumps has a predetermined length extended in a second direction perpendicular to the first direction, the bumps comprise first bumps disposed on the first electrode terminals and second bumps disposed on the second electrode terminals, the second bumps are separated from the first bumps and the separated distance between the first and second bumps is greater than half of the predetermined length.
9. The circuit device of claim 8, wherein each of the bumps has a rectangular shape when viewed from an upper side of the bumps.
10. The circuit device of claim 9, wherein each of the bumps has at least one chamfered corner portion.
11. The circuit device of claim 9, wherein each of the bumps has at least one rounded corner portion.
12-14. (canceled)
15. A display device comprising:
a display panel having a display area on which a gate line, a data line perpendicular to the gate line and a plurality of pixels are formed and a peripheral area on which electrode pads extended from the gate and data lines are formed, the peripheral area being disposed adjacent to the display area; and
a drive IC having electrode terminals linearly aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and linearly aligned in a plurality of rows along a second direction perpendicular to the first direction and bumps disposed on the electrode terminal, the drive IC being electrically connected to the electrode pads,
wherein distances between adjacent two electrode terminals aligned in the second direction from respective adjacent columns are uniform, and each of the bumps has at least one chamfered corner portion.
16. The display device of claim 15, wherein each of the bumps has at least one rounded corner portion.
17. (canceled)
18. The display device of claim 15, wherein the display panel is a liquid crystal display panel that displays an image by driving a liquid crystal.
19. A display device comprising:
a display panel having a display area on which a gate line, a data line perpendicular to the gate line and a plurality of pixels are formed and a peripheral area on which electrode pads extended from the gate and data lines are formed, the peripheral area being disposed adjacent to the display area; and
a drive IC having electrode terminals aligned in a plurality of columns along a first direction parallel to an edge line of a semiconductor substrate and bumps disposed on the electrode terminals,
wherein the electrode terminals comprise first electrode terminals aligned in a first column and second electrode terminals aligned in a second column adjacent to the first column, distances between adjacent two first electrode terminals are uniform and the second electrode terminals are positioned at areas corresponding to areas between the first electrode terminals aligned in the first column.
20. The display device of claim 19, wherein the electrode pads are positioned at the peripheral area and aligned in the plurality of columns along the first direction, the electrode pads comprise first electrode pads aligned in the first column and second electrode pads aligned in the second column, distances between adjacent two electrode pads are uniform, and the second electrode pads are positioned at areas corresponding to areas between the first electrode pads aligned in the first column.
21. The display device of claim 19, wherein each of the bumps has a predetermined length extended in a second direction perpendicular to the first directions, the bumps comprise first bumps disposed on the first electrode terminals and second bumps disposed on the second electrode terminals, the second bumps are separated from the first bumps and the separated distance between the first and second bumps is greater than a half of the predetermined length.
22. The display device of claim 21, wherein each of the bumps has a rectangular shape when viewed from an upper side of the bumps.
23. The display device of claim 22, wherein each of the bumps has at least one chamfered corner portion.
24. The display device of claim 22, wherein each of the bumps has at least one rounded corner portion.
25. The display device of claim 19, wherein the drive IC is electrically connected to the display panel by means of anisotropic conductive film.
26. The display device of claim 19, wherein the display panel is a liquid crystal display panel that displays an image by driving a liquid crystal.
US11/738,009 2003-02-20 2007-04-20 Drive ic and display device having the same Abandoned US20070188693A1 (en)

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EP1450405A3 (en) 2007-08-29
JP2004252466A (en) 2004-09-09
KR20040075377A (en) 2004-08-30
JP2011100126A (en) 2011-05-19
US20040165138A1 (en) 2004-08-26
EP1450405A2 (en) 2004-08-25
JP5060609B2 (en) 2012-10-31
CN1523409A (en) 2004-08-25
EP1450405B1 (en) 2019-09-11
TW200501023A (en) 2005-01-01
US7224424B2 (en) 2007-05-29
TWI357993B (en) 2012-02-11

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