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WO2007108165A1 - Dispositif d'affichage a cristaux liquides - Google Patents

Dispositif d'affichage a cristaux liquides Download PDF

Info

Publication number
WO2007108165A1
WO2007108165A1 PCT/JP2006/323021 JP2006323021W WO2007108165A1 WO 2007108165 A1 WO2007108165 A1 WO 2007108165A1 JP 2006323021 W JP2006323021 W JP 2006323021W WO 2007108165 A1 WO2007108165 A1 WO 2007108165A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
display device
luminance
data signal
Prior art date
Application number
PCT/JP2006/323021
Other languages
English (en)
Japanese (ja)
Inventor
Satoshi Sekido
Original Assignee
Sharp Kabushiki Kaisha
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 Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2007108165A1 publication Critical patent/WO2007108165A1/fr

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other

Definitions

  • the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a backlight device.
  • liquid crystal display devices are used in various fields such as mobile phones, televisions, and computers.
  • the liquid crystal display device performs gradation display by adjusting the transmittance of the liquid crystal layer by changing the magnitude of the voltage applied to the pixel electrode for each pixel in accordance with the display image.
  • a liquid crystal display device usually includes a backlight device that illuminates the liquid crystal display panel with a back surface power in addition to the liquid crystal display panel, except for some single-color display devices that do not perform power.
  • FIG. 3 is an explanatory diagram for explaining the response speed in a conventional liquid crystal display device.
  • FIG. 3A shows a change in the data signal voltage applied to the pixel electrode of one pixel
  • FIG. Fig. 3C shows the change in the luminance of the backlight device
  • Fig. 3D shows the change in the apparent luminance on the display screen in one pixel.
  • the liquid crystal display device shown in FIGS. 3A to 3D is configured to be capable of gradation display.
  • the levels of “Data signal voltage”, “Transmittance of liquid crystal layer”, “Brightness of backlight device”, and “Luminance of appearance on display screen” showing the vertical axis of each of FIGS. 3A to 3D are gradation levels. The corresponding relative value is shown. 3A to 3D, the horizontal axis is time.
  • the transmissivity of the liquid crystal layer changes more slowly than the data signal voltage. Therefore, after the level of the data signal voltage is switched, There is a time lag until the transmittance of the light reaches the corresponding value (set value).
  • the response time of the liquid crystal layer is 16 ms (Typ).
  • the brightness of the knocklight is constant regardless of the level of the data signal voltage.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-302160
  • An object of the present invention is to provide a liquid crystal display device that can solve the above-described problems and can improve the response speed as compared with the prior art.
  • a liquid crystal display device is a liquid crystal display device including a liquid crystal display panel and a backlight device that illuminates the liquid crystal display panel, and the luminance of the backlight device
  • a control unit that controls the brightness of the backlight device during a set time when the data signal voltage applied to any pixel electrode of the liquid crystal display panel changes. It is characterized by raising or lowering.
  • the invention's effect As described above, in the liquid crystal display device according to the present invention, when the level of the applied data signal voltage changes from the level in the previous frame period at the pixel electrode of any pixel, the backlight is simultaneously generated. The brightness of the device temporarily increases or decreases.
  • the liquid crystal display device when the level of the data signal voltage increases, there is a time lag until the transmittance of the liquid crystal layer reaches a set value, and conventionally, the amount of light passing through the liquid crystal layer is insufficient during this time.
  • the brightness of the knocklight device is increased, so that the shortage of light quantity is compensated.
  • the apparent luminance on the display screen reaches the set value in a shorter period of time than in the prior art, and the liquid crystal display device according to the present invention can improve the response speed as compared with the prior art.
  • FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 2 is an explanatory diagram for explaining the response speed in the liquid crystal display device shown in FIG. 1.
  • FIG. 2A shows a change in the data signal voltage applied to the pixel electrode of one pixel
  • FIG. Fig. 2C shows the change in luminance of the liquid crystal layer in one pixel
  • Fig. 2C shows the change in luminance of the backlight device
  • Fig. 2D shows the change in the apparent luminance on the display screen in one pixel.
  • FIG. 3 is an explanatory diagram for explaining the response speed in a conventional liquid crystal display device.
  • FIG. 3A shows a change in the data signal voltage applied to the pixel electrode of one pixel
  • FIG. 3C shows the change in luminance of the backlight device
  • FIG. 3D shows the change in the apparent luminance on the display screen in one pixel.
  • the liquid crystal display device is a liquid crystal display device including a liquid crystal display panel and a backlight device that illuminates the liquid crystal display panel, and includes a control unit that controls the luminance of the backlight device.
  • the control unit increases or decreases the luminance of the backlight device during a set time when a data signal voltage applied to any pixel electrode of the liquid crystal display panel changes.
  • the backlight device includes a light emitting diode as a light source, and the control unit controls the current value of the current supplied to the light emitting diode by controlling the current value of the current. It is preferable to adopt a mode for controlling the above. According to this aspect, the brightness of the knocklight device can be controlled easily and accurately.
  • the control unit when the first change in the data signal voltage occurs in one frame period, changes the luminance of the backlight device during a set time. It is preferable to adopt a mode of raising or lowering. This aspect is particularly effective when the gradation of the entire display area of the liquid crystal display panel changes at once.
  • FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device according to an embodiment of the present invention.
  • the liquid crystal display device in the present embodiment mainly includes a liquid crystal display panel and a backlight device 9 that illuminates the liquid crystal display panel.
  • the liquid crystal display panel is configured by sealing a liquid crystal layer between an active matrix substrate 1 and a counter substrate. In FIG. 1, only the active matrix substrate 1 is shown, and the counter substrate and the liquid crystal layer are not shown.
  • the liquid crystal display panel also includes a gate driver 2, a source dryer 3, and a control IC 4. Further, although not shown, the counter substrate is provided with a common electrode, a color filter corresponding to each pixel, and the like.
  • the active matrix substrate 1 includes a plurality of pixels A to A arranged in a matrix in an area corresponding to a display area (n and m are arbitrary integers). Pixel A
  • a plurality of source lines X to X are arranged. Between each row of pixels A to A
  • a plurality of gate lines Y to Y are arranged along the horizontal direction of the screen.
  • Each of the source lines X to ⁇ is connected to the source electrode and the source of the TFT 10 constituting the corresponding column.
  • Each of the gate lines Y to Y constitutes a corresponding row
  • the gate electrode of TFT10 and the gate driver 2 are connected.
  • the gate driver 2 and the source driver 3 are connected to the control IC 4.
  • the control IC 4 receives an image signal, a synchronization signal, a clock signal, and the like from outside the liquid crystal display panel. When these signals are input, the control IC 4 generates a gate driver control signal and a source driver control signal at timings suitable for the gate driver 2 and the source driver 3 to drive the liquid crystal. The control IC 4 outputs an image signal, a source driver control signal, and a clock signal to the source driver 3, and outputs a gate driver control signal and a clock signal to the gate driver 2.
  • the gate driver 2 and the source driver 3 are supplied with a power supply voltage from a power supply circuit (not shown).
  • the source driver 3 is also supplied with a gradation reference voltage (V to V (1: integer)) from a gradation voltage circuit (not shown).
  • a counter electrode voltage (Vcom) is supplied to the counter electrode of the counter substrate from a counter electrode drive circuit (not shown).
  • the inversion driving method is employed, and the polarity of the voltage applied to the liquid crystal layer is inverted every frame or every horizontal period.
  • the gate driver 2 includes the gate lines Y to Y based on the gate driver control signal and the clock signal.
  • a data signal voltage is applied to the pixel electrode 11 of the pixel in the row.
  • the liquid crystal display device in the present embodiment is the same as the conventional liquid crystal display device.
  • the power that has the configuration of is different from that in the following points.
  • the liquid crystal display device according to the present embodiment includes a backlight control unit 5 that controls the luminance of the backlight device 9.
  • the knock light control unit 5 increases or decreases the brightness of the knock light device 9 for a set time.
  • the brightness of the knock device during drawing is constant (see FIG. 3C), but in this embodiment, the luminance of the backlight device during drawing is not constant. .
  • the knock light device 9 is an edge light type backlight device, and includes a light guide plate 8a and a plurality of light emitting diodes 8b arranged on one side surface of the light guide plate 8a.
  • the light emitting diode 8b is disposed only on one side surface of the light guide plate 8a.
  • the present embodiment is not limited to this.
  • the light emitting diode 8b may be disposed on two opposite side surfaces.
  • the backlight control unit 5 increases or decreases the luminance of the backlight device 9 by controlling the current value of the current supplied to the light emitting diode 8b. Further, in the present embodiment, the knock light control unit 5 increases or decreases the luminance of the backlight device 9 when the first change in the data signal voltage occurs in one frame period. Note that the “frame period” means the period from when all the gate lines are scanned sequentially from top to bottom until the display of one screen is completed once.
  • the backlight control unit 5 includes a data operation circuit 6 and a current control circuit 7 that supplies current to the light-emitting diode 8b in response to an instruction from the data operation circuit 6.
  • the data arithmetic circuit 6 receives image signals, synchronization signals, clock signals, and the like from the outside of the liquid crystal display panel. Based on these input signals, the data arithmetic circuit 6 first detects the timing at which the data signal voltage changes during the current frame period.
  • the data arithmetic circuit 6 detects the output timing of the data signal voltage after the gate line Y is selected. And de
  • the data calculation circuit 6 sends a current control signal to the current control circuit 7 at the detected timing. Increase or decrease the current value. Specifically, when the data signal voltage increases, the data arithmetic circuit 6 increases the current value and increases the brightness of the knocklight device 9. On the other hand, when the data signal voltage decreases, the data arithmetic circuit 6 decreases the current value to decrease the brightness of the knock light device 9.
  • the data calculation circuit 6 causes the current control circuit to increase or decrease the current value only during the set time for the detected time point.
  • the setting time, current value increase and decrease ranges will be described later with reference to FIG.
  • information (luminance information) for specifying the luminance of the light source 8b is input to the current control circuit 7 from the optical sensor 12 disposed in the vicinity of the light emitting diode 8b.
  • the current control circuit 7 controls the current value supplied to the light emitting diode 8b by feedback control based on luminance information. Specifically, the current control circuit 7 performs feedback control so that the target value of luminance given from the data calculation circuit 6 is achieved.
  • the current control circuit 7 can obtain the current value of V, which is actually supplied to the light emitting diode 8b as the luminance information power, and can control the supplied current based on the obtained current value.
  • FIG. 2 is an explanatory diagram for explaining the response speed in the liquid crystal display device shown in FIG. 1.
  • FIG. 2A shows a change in the data signal voltage applied to the pixel electrode of one pixel
  • FIG. 2B shows one pixel
  • 2C shows the change in the transmittance of the liquid crystal layer
  • FIG. 2C shows the change in the brightness of the backlight device
  • FIG. 2D shows the change in the apparent brightness of the display screen in one pixel.
  • the levels of "data signal voltage”, “transmittance of the liquid crystal layer”, “brightness of the backlight device”, and “appearance brightness of the display screen” indicating the vertical axes of FIGS. 2A to 2D are as follows: It is shown as a relative value corresponding to the gradation level. 2A to 2D, the horizontal axis is time.
  • the transmittance of the liquid crystal layer also changes more slowly than the data signal voltage due to the characteristics of the liquid crystal material in this embodiment.
  • the response time of the liquid crystal layer is 16 ms (Typ).
  • the backlight control unit 5 increases the brightness for the set time.
  • the transmittance of the liquid crystal layer rises to the set value, and the amount of illumination light that passes through the liquid crystal layer increases as compared with the case where the luminance is constant (see FIG. 3C).
  • the apparent brightness on the display screen reaches the set value in a short time.
  • the time required for the apparent brightness on the display screen to reach the set value is only 0.1 ⁇ s or less.
  • the force for explaining the case where the data signal voltage is increased is not limited to this example.
  • the backlight control unit 5 simultaneously decreases the luminance for the set time.
  • the light intensity of the illumination light that passes through the liquid crystal layer when the transmittance of the liquid crystal layer does not decrease to the set value decreases compared to the case where the luminance is constant, so the apparent luminance on the display screen is Decrease to set value in a short time
  • the apparent luminance on the display screen reaches the set value in a shorter period of time compared to the case where the luminance of the conventional knock light device is constant. . Therefore, according to the liquid crystal display device of the present invention, the response speed can be improved as compared with the conventional liquid crystal display device. Further, in the present embodiment, the increase and decrease in luminance occur over the entire light emitting surface of the knocklight device. Therefore, in the liquid crystal display device in this embodiment, in particular, the entire display area of the liquid crystal display panel is This is effective when the gradation changes at once.
  • the time to increase or decrease the luminance, the increase width and the decrease width of the luminance in other words, the time to increase or decrease the current value supplied to the light emitting diode 8b
  • the descending width may be set according to the reaction rate of the liquid crystal material constituting the liquid crystal layer.
  • the time for raising or lowering the current value, the rise and fall width of the current value are the amount of light per unit time of light passing through the liquid crystal layer, and the transmittance of the liquid crystal layer is the set value. It is set to be almost constant before reaching and after reaching It is preferable.
  • the current waveform is shown in FIG. 2B. It is preferable to set it so that a curve that reverses the waveform of the transmittance of the liquid layer is drawn. In this way, the apparent brightness on the display screen can be reliably reached to the set value in a short period of time.
  • the knock light device 9 is configured to uniformly illuminate the entire back surface of the liquid crystal display panel. It is not limited to.
  • the knock light device may have a light emitting surface divided into a plurality of areas and capable of illuminating with different brightness for each area.
  • the backlight device may be capable of illuminating the back surface of the liquid crystal display panel with different luminance for each pixel (row) aligned in the horizontal direction, or the back surface of the liquid crystal display panel for each pixel. It may be one that can be illuminated with different brightness.
  • a specific example of such a backlight device is a direct type knock device in which a plurality of light emitting diodes are arranged in a matrix.
  • a direct type knock device in which a plurality of light emitting diodes are arranged in a matrix.
  • the same number of light emitting diodes as the number of rows of pixels are arranged.
  • the same number of light emitting diodes as the number of pixels are arranged.
  • the knock light control unit determines whether a change in the data signal voltage occurs each time the data signal voltage is output as the source line force.
  • the backlight control unit supplies a current obtained by increasing or decreasing the current value to the light emitting diode that illuminates the corresponding row.
  • the backlight control unit when the backlight control unit detects a change in the data signal voltage, the backlight control unit increases or decreases the current value with respect to the light emitting diode corresponding to the pixel in which the data signal voltage changes. Supply the lowered current.
  • the gate driver 2 and the source driver 3 can be provided by an IC chip.
  • the IC chip that functions as the gate driver 2 and the source driver 3 is mounted in a peripheral area of the display area of the active matrix substrate 1 by COG (Chip On Glass), TCP (Tape Carrier Package), or the like.
  • COG Chip On Glass
  • TCP Transmission Carrier Package
  • these IC chips are
  • the active matrix substrate 1 is connected to source lines or gate lines formed on the active matrix substrate 1.
  • the circuits constituting the gate driver 2 and the source driver 3 can be formed monolithically on the active matrix substrate 1.
  • knock light control unit 5 can also be provided by an IC chip.
  • This IC chip can also be mounted in the area around the display area of the active matrix substrate 1 by COG, TCP, or the like.
  • all or part of the data arithmetic circuit 6 and the current control circuit 7 constituting the backlight control unit 5 can be formed monolithically on the active matrix substrate 1.
  • the liquid crystal display device according to the present invention is effective as a display device for various devices such as a mobile phone, a television, and a computer. Therefore, the liquid crystal display device according to the present invention has industrial applicability.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un dispositif d'affichage à cristaux liquides capable d'améliorer la vitesse de réaction par comparaison à l'état antérieur de la technique. Lorsqu'on modifie un niveau de tension de signal de données appliqué à l'un des pixels du dispositif d'affichage à cristaux liquides par rapport à une période d'image précédente, la luminance du dispositif de rétro-éclairage est simultanément augmentée ou diminuée temporairement. Ainsi, la quantité de lumière traversant la couche de cristaux liquides par unité de temps est sensiblement constante avant et après que le facteur de transmission de la couche de cristaux liquides atteigne une valeur spécifiée et la luminance apparente sur l'écran d'affichage atteint la valeur spécifiée en un temps réduit par comparaison à l'état antérieur de la technique. La vitesse de réaction s'en trouve améliorée. Le dispositif d'affichage à cristaux liquides de la présente invention peut être appliqué à un téléphone mobile, à un téléviseur et au dispositif d'affichage d'un ordinateur.
PCT/JP2006/323021 2006-03-23 2006-11-17 Dispositif d'affichage a cristaux liquides WO2007108165A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006081272 2006-03-23
JP2006-081272 2006-03-23

Publications (1)

Publication Number Publication Date
WO2007108165A1 true WO2007108165A1 (fr) 2007-09-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011217370A (ja) * 2011-03-24 2011-10-27 Toshiba Corp 映像表示装置及び映像表示方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001281634A (ja) * 2000-03-31 2001-10-10 Canon Inc 液晶素子の駆動方法
JP2002123226A (ja) * 2000-10-12 2002-04-26 Hitachi Ltd 液晶表示装置
JP2002156950A (ja) * 2000-09-08 2002-05-31 Hitachi Ltd 液晶表示装置
JP2006323299A (ja) * 2005-05-20 2006-11-30 Toyota Industries Corp 液晶表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001281634A (ja) * 2000-03-31 2001-10-10 Canon Inc 液晶素子の駆動方法
JP2002156950A (ja) * 2000-09-08 2002-05-31 Hitachi Ltd 液晶表示装置
JP2002123226A (ja) * 2000-10-12 2002-04-26 Hitachi Ltd 液晶表示装置
JP2006323299A (ja) * 2005-05-20 2006-11-30 Toyota Industries Corp 液晶表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011217370A (ja) * 2011-03-24 2011-10-27 Toshiba Corp 映像表示装置及び映像表示方法

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