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WO2008111815A1 - Feuille de prisme de diffuseur comprenant un diffuseur de lumière dans un creux d'un prisme et unité lcd à rétroéclairage réalisée avec ce diffuseur - Google Patents

Feuille de prisme de diffuseur comprenant un diffuseur de lumière dans un creux d'un prisme et unité lcd à rétroéclairage réalisée avec ce diffuseur Download PDF

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Publication number
WO2008111815A1
WO2008111815A1 PCT/KR2008/001435 KR2008001435W WO2008111815A1 WO 2008111815 A1 WO2008111815 A1 WO 2008111815A1 KR 2008001435 W KR2008001435 W KR 2008001435W WO 2008111815 A1 WO2008111815 A1 WO 2008111815A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
prism sheet
unit prisms
diffuser
sheet according
Prior art date
Application number
PCT/KR2008/001435
Other languages
English (en)
Inventor
Jun Hyeak Choi
Man Suk Kim
Ju Yeol Choi
Seok Hoon Jang
Original Assignee
Cheil Industries Inc.
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
Priority claimed from KR1020080022438A external-priority patent/KR100993383B1/ko
Application filed by Cheil Industries Inc. filed Critical Cheil Industries Inc.
Priority to CN2008800081887A priority Critical patent/CN101646973B/zh
Publication of WO2008111815A1 publication Critical patent/WO2008111815A1/fr
Priority to US12/585,372 priority patent/US8274626B2/en

Links

Classifications

    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to a diffuser prism sheet and a liquid crystal display (LCD) back light unit using the same.
  • LCD liquid crystal display
  • a liquid crystal display (hereinafter, referred to simply as an "LCD”) device refers to a device which displays numerals or images through application of an electric field to liquid crystals disposed between two glass substrates formed with electrodes, in which the liquid crystals are made of a material having an intermediate phase between a liquid and a solid.
  • the LCD device Since the LCD device is not a self-luminescent device, it must be provided with a back light unit as a light source to generate light. An image is displayed in such a manner that transmittance of light generated from the back light unit is adjusted in a liquid crystal panel, in which liquid crystals are uniformly arranged.
  • FIG. 1 is an exploded perspective view showing a back light unit of a conventional LCD device.
  • a conventional LCD back light unit includes a light source 105, a light guide plate 110, a reflection plate 115, a diffusion sheet 120, prism sheets 125 and a protective sheet 130.
  • the light source 105 serves to emit light initially in the LCD device.
  • Various types of light sources can be used, however the LCD device generally employs a cold cathode fluorescence lamp (CCFL) as the light source 105, which has a low power consumption and emits very bright white light.
  • CCFL cold cathode fluorescence lamp
  • the light guide plate 110 is provided below an LCD panel 100 and near one side of the light source 105.
  • the light guide plate 110 serves to convert spot light generated from the light source 105 into plane light and then project the plane light forward to the LCD panel.
  • the reflection plate 115 is provided below the light guide plate 110.
  • the reflection plate 115 serves to reflect light emitted from the light source 105 toward the LCD panel 100 disposed in front of the reflection plate 115.
  • the diffusion sheet 120 is provided above the light guide plate 110. The diffusion sheet 120 serves to uniformize light passing through the light guide plate 110.
  • the prism sheets 125 are used to refract and concentrate the light, to thereby enhance brightness.
  • two prism sheets arranged in the perpendicular direction to each other are used.
  • the protective sheet 130 is provided above the prism sheets 125.
  • the protective sheet 130 serves to prevent scratches on the prism sheets 125, and to prevent the Moire effect from occurring when using the prism sheets 125 arranged in two layers in the vertical and horizontal directions.
  • the conventional LCD back light unit includes the above-described components.
  • the present invention is to add other technical ideas to the prism sheets 125 of the components.
  • Each of the prism sheets 125 is commonly configured such that a plurality of unit prisms are arranged successively with regular orientation on one surface of a film made of a transparent material.
  • the prism sheet 125 serves to refract the light progressing from the light guide plate 110 and diffused through the diffusion sheet 120 to have regular orientation.
  • the development of the LCD moves to a large-scale panel more than 40 inches from a monitor of 17 inches or 19 inches.
  • One of the most important factors in the large-scale panel is to maintain the intensity of light from the back light over a predetermined level and to uniformly distribute the light onto an object surface to be viewed.
  • a critical value of the brightness of light i.e., a value which the brightness of light is not required to exceed, exists.
  • the intensity of the light emitted from the light source is sufficiently large.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a diffuser prism sheet having a function of effectively diffusing light in addition to a function of refracting light to have orientation.
  • the objects to be accomplished by the present invention are not limited to the above objects, and other objects will be clearly understood by a person skilled in the art from the following detailed description.
  • a diffuser prism sheet comprising: a base film made of a transparent material; a light refracting part formed on one surface of the base film, the light refracting part including a plurality of unit prisms having a predetermined shape of a cross section and arranged in one direction; and light diffusing elements formed on valley portions between the adjacent unit prisms of the light refracting part.
  • At least 50 % of the light diffusing elements are distributed on valley surfaces of regions under a half of a height of each of the unit prisms.
  • an LCD back light unit comprising: a light guide plate; a light source disposed at a side surface or a rear surface of the light guide plate; and the aforementioned diffuser prism sheet formed on a surface of the light guide plate, from which light progresses, and having light refracting and light diffusing functions.
  • the diffuser prism sheet having the light refracting function and the light diffusing function can be manufactured. Accordingly, the light guide plate for use in an LCD back light unit having light diffusing and transmitting capability with high brightness can be manufactured. Further, since it is possible to eliminate a diffusion sheet used in the prior art, manufacturing costs can be saved, and the light guide plate can be decreased in thickness.
  • FIG. 1 is an exploded perspective view showing a back light unit of a conventional LCD device
  • FIG. 2 is a perspective view schematically showing a diffuser prism sheet according to an embodiment of the present invention
  • FIG. 3 is a photograph of an electron microscope of a model manufactured in practice with respect to the diffuser prism sheet according to the embodiment of the present invention.
  • FIG. 4 is an enlarged perspective view of an "A" portion in FIG. 2;
  • FIG. 5 is a view for explaining a pattern of light diffusing elements formed on a surface of the diffuser prism sheet;
  • FIG. 6 is an enlarged photograph with respect to the photograph of an electron microscope in FIG. 3;
  • FIG. 7 is a photograph of an experimental result with respect to a sample manufactured according to a comparative example.
  • FIG. 8 is a photograph of an experimental result with respect to a sample manufactured according to an experimental example.
  • a diffuser prism sheet comprises: a base film made of a transparent material; a light refracting part formed on one surface of the base film, the light refracting part including a plurality of unit prisms having a predetermined shape of a cross section and arranged in one direction; and light diffusing elements formed on valley portions between the adjacent unit prisms of the light refracting part. At least 50 % of the light diffusing elements are distributed on valley surfaces of regions under a half of a height of each of the unit prisms.
  • FIG. 2 is a perspective view schematically showing a diffuser prism sheet according to an embodiment of the present invention
  • FIG. 3 is a photograph of an electron microscope of a model manufactured in practice with respect to the diffuser prism sheet according to the embodiment of the present invention.
  • FIG. 4 is an enlarged perspective view of an "A" portion in FIG. 2
  • FIG. 5 is an enlarged photograph with respect to the photograph of an electron microscope in FIG. 3.
  • a diffuser prism sheet 20 according to the embodiment of the present invention includes a base film 200, a light refracting part 210 and light diffusing elements 220.
  • the base film 200 serves as a base layer of the diffuser prism sheet.
  • the base film 200 is generally made of a transparent material, such as transparent synthetic resin (e.g., polyethylene, polypropylene or polycarbonate), glass, metallic thin film, etc.
  • a thickness of the base film 200 is not certainly limited, however the thickness is generally several micrometers ( ⁇ m).
  • the light refracting part 210 serves to refract the light transmitting through the base film 200, to thereby provide the light with uniform orientation.
  • the light refracting part 210 is formed on one surface of the base film 200.
  • the light refracting part 210 is configured as a prism shape.
  • one surface of the base film 200 is formed with the light refracting part 210 which includes a plurality of unit prisms 211 to refract the light transmitting the base film 200 in a predetermined direction.
  • each of the unit prisms 211 of the light refracting part 210 has a triangle-shaped cross section and has a trigonal prism shape as a whole, the shape of the cross section of the unit prisms 211 of the light refracting part 210 is not limited to the triangular shape.
  • the unit prisms having a cross section of a semicircular shape (which is also called a semicylindrical shape or a lenticular shape) or any other shape capable of refracting light can be applied to the present invention.
  • the unit prisms can be configured as a transparent member having at least two optical planes capable of refracting light, in which at least one pair of surfaces of the optical planes are not parallel with each other, such as a cross section of a trapezoidal shape.
  • the determination of the shape of the cross section of the unit prisms 211 depends on features of a device to which the prism sheet is applied in practice, a required sight angle, a screen size, etc.
  • the plurality of unit prisms 211 of the light refracting part 210 are arranged in one direction, and are formed successively without a gap therebetween. However, in a case where straightness of light is more required rather than refraction of light, flat planes may be formed between the unit prisms 211. In other words, the unit prisms 211 may be arranged with a regular gap therebetween, instead of densely. It is preferred that a height of each of the unit prisms 211 (because the height of each of the unit prisms is not uniform, the height is defined as an average height) is set to be a range of 5 ⁇ m to 500 ⁇ m.
  • a vertex angle ( ⁇ ) is preferably in the range of 30 to 120 degrees.
  • the light diffusing elements 220 are irregularly distributed on a lower portion of the light refracting part 210, i.e., lower portions of valleys formed between the adjacent unit prisms 211.
  • the light diffusing elements 220 are configured as circle-shaped lenses, oval-shaped lenses, or both the circle-shaped and oval-shaped lenses.
  • the light diffusing elements 220 cover the surface of the light refracting part 210 in such a manner that a plurality of lens-shaped elements having a round end surface are distributed in contact with each other or apart from each other in a concave-convex form on the lower portions of the unit prisms 211.
  • a size of the oval lens of the light diffusing element 220 should be smaller than a size of a light refracting portion. More particularly, when the light diffusing element 220 is configured as a circular lens, a ratio of a diameter of the lens to a pitch (P) of the prisms (diameter/pitch ratio) is preferably in the range of 0.01 to 0.9.
  • a ratio of a long diameter of the lens to the pitch (P) of the prisms is preferably in the range of 0.01 to 0.9.
  • a ratio of a height of the light diffusing portion to a height of the light refracting portion is preferably in the range of 0.01 to 0.9.
  • the light diffusing elements 220 are formed to diffuse the light, transmitting through the base film 200 and the light refracting part 210, from the surface of the light refracting part 210 by a very small amount (here, to diffuse the light by a very small amount means to diffuse the light maximally to the ambient while maintaining a brightness reduction ratio of the refracted light in the range of approximately 5 to 10 %).
  • At least 50 % (more preferably at least 70 %) of the light diffusing elements 220 are distributed on the valley surfaces between the unit prisms 211, especially regions under a half of the height (h) of the unit prism 211 of the light refracting part 210.
  • the light diffusing elements 220 are more distributed on the lower portion of the unit prism 211 than the upper portion of the unit prism 211 of the light refracting part 210. More particularly, the light diffusing elements 220 are more distributed on the valley surfaces under a half of the height (h) of the unit prism 211
  • the reason for regulating the distribution density of the light diffusing elements 220 as described above is that arranging the light diffusing elements 220 concentratedly on the valley portions (under the condition of forming the same number of light diffusing elements) results in improvement of various properties.
  • the light diffusing elements 220 serve to haze the exterior appearance of the optical sheet, thereby enhancing concealment of inferior points.
  • the light diffusing elements 220 have a shortcoming of changing the optical path and thereby decreasing brightness of the back light.
  • the brightness properties are improved when the light diffusing elements 220 are concentratedly formed on the valley portions.
  • the light diffusing elements 220 may be configured as the oval-shaped lenses or both the circle-shaped and oval- shaped lenses as shown in FIG. 5.
  • the light diffusing elements 220 provided between the unit prisms 211 are configured as oval-shaped lenses, and the above- described long diameter of the oval-shaped lens is indicated by a reference letter a.
  • the light refracting part 210 is manufactured in such a manner that the mold having a recessed pattern is pressed to a transparent film having a uniform thickness to form an embossed prism shape, corresponding to the recessed pattern, on the surface of the transparent film. At this time, the upper surface of the transparent film becomes the light refracting part 210 having the prism shape, and the lower surface of the transparent film becomes the base film.
  • FIGs. 3 and 6 are photographs of an electron microscope with respect to the surface of the diffuser prism sheet which has been manufactured in practice according to the above method.
  • the light refracting part of a prism shape is formed on a film having a predetermined thickness, and the light diffusing elements are formed in a circle or oval lens shape on the lower portion of the light refracting part, i.e., on the valley portions between the adjacent unit prisms.
  • the above-described diffuser prism sheet 20 is used to be deposited on the surface of the light guide plate, from which the light progresses.
  • a conventional diffusion sheet which has been provided separately, can be eliminated.
  • the diffuser prism sheet 20 of the present invention can be applied to both an edge type LCD back light unit, in which the light source is disposed at a side surface of the light guide plate, and a direct type LCD back light unit, in which the light source is disposed at a lower surface of the light guide plate. Also, any one of a CCFL and an LED can be used as the light source.
  • the light diffusing part is formed in one body with the light refracting part, on the lower portion of the light refracting part.
  • the light diffusing part may not be formed separately from the light refracting part by use of an adhesive resin such as beads.
  • an experimental example will be explained, which proves that the light guide plate manufactured by using the diffuser prism sheet according to the embodiments of the present invention has good haze (which refers to the degree of light scattering) and transmittance properties without a large decrease of brightness. Since the non-described technical contents are well known to a person who is skilled in the art of the invention, explanation thereof will be omitted.
  • the light refracting part has a triangle-shaped cross section having a vertex angle of 90 degrees and a height or pitch of approximately 50 ⁇ m and the light diffusing elements formed in a lens shape are distributed irregularly on the lower portion of the light refracting part.
  • the lens shape has a diameter of 10 to 80 % of a pitch of the prisms, and approximately 60 % of the light diffusing elements are distributed on the area under a half of the height of the prism.
  • An experimental example 2 is the same as the experimental example 1, except that approximately 70 % of the light diffusing elements are distributed on the valley surfaces under a half of the height of the prism.
  • An experimental example 3 is the same as the experimental example 1, except that approximately 80 % of the light diffusing elements are distributed on the valley surfaces under a half of the height of the prism.
  • a comparative example is the same as the experimental example 1, except that approximately 40 % of the light diffusing elements are distributed on the valley surfaces under a half of the height of the prism.
  • a comparative test of the above experimental examples and comparative example was performed under the condition such that physical properties of the base film, such as kind, transparency, haze and thickness, used in the experimental examples are the same as those of the base film used in the comparative example.
  • FIG. 7 is a photograph of the experimental result with respect to the sample manufactured according to the comparative example
  • FIG. 8 is a photograph of the experimental result with respect to the sample manufactured according to the experimental example 1.
  • the following table 1 shows the measured results of brightness, haze and transmittance of the samples manufactured according to the comparative and experimental examples.
  • the sample of the comparative example has superior center brightness, but has an inferior light diffusion.
  • the above table 1 shows that the sample of the comparative example has center brightness of 5710 cd/m 2 , haze of 83.0 %, and transmittance of 9.0 %.
  • the above table 1 shows that the sample of the experimental example 1 has center brightness of 5638 cd/m 2 , haze of 90.0 %, and transmittance of 12.4 %.
  • the sample of the experimental example 2 has center brightness of 5530 cd/m", haze of 91.8 %, and transmittance of 16.2 %.
  • the sample of the experimental example 3 has center brightness of 5423 cd/m 2 , haze of 93.0 %, and transmittance of 19.04 %.
  • the use of the diffuser prism sheet according to the embodiment of the present invention results in remarkable improvement of diffusion properties of the optical sheet (refer to FIG. 8), in spite of a small decrease ratio (5 to 10 % or less) of the center brightness when compared to the structure without the light diffusing elements 220.
  • the table 1 also shows that the transmittance is increased as the density of the light diffusing elements 220 of the diffuser prism is increased, which is resulted from retroreflection characteristics of the prism film.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

Une feuille de prisme à diffuseur possède des fonctions de réfraction et de diffusion de lumière. La feuille de prisme de diffuseur comprend un film de base fait d'un matériau transparent, une partie de réfraction de lumière formée sur une surface du film de base et comprenant une pluralité de prismes d'unité possédant une forme prédéterminée d'une section transversale et ménagée dans une direction ainsi que des éléments de diffusion de lumière formés dans les parties de creux entre les prismes d'unités adjacents de la partie de réfraction de lumière. L'invention concerne aussi une unité LCD à rétroéclairage utilisant ce prisme de diffuseur.
PCT/KR2008/001435 2007-03-15 2008-03-14 Feuille de prisme de diffuseur comprenant un diffuseur de lumière dans un creux d'un prisme et unité lcd à rétroéclairage réalisée avec ce diffuseur WO2008111815A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2008800081887A CN101646973B (zh) 2007-03-15 2008-03-14 在棱柱谷包括光扩散体的扩散棱镜片及lcd背光单元
US12/585,372 US8274626B2 (en) 2007-03-15 2009-09-14 Diffuser prism sheet with light diffusing element on valley region, LCD back light unit including the same, and LCD device including the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2007-0025468 2007-03-15
KR20070025468 2007-03-15
KR10-2008-0022438 2008-03-11
KR1020080022438A KR100993383B1 (ko) 2007-03-15 2008-03-11 프리즘의 계곡부위에 형성된 광확산체를 포함하는 디퓨져프리즘 시트 및 이를 이용한 액정표시장치

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/585,372 Continuation US8274626B2 (en) 2007-03-15 2009-09-14 Diffuser prism sheet with light diffusing element on valley region, LCD back light unit including the same, and LCD device including the same

Publications (1)

Publication Number Publication Date
WO2008111815A1 true WO2008111815A1 (fr) 2008-09-18

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PCT/KR2008/001435 WO2008111815A1 (fr) 2007-03-15 2008-03-14 Feuille de prisme de diffuseur comprenant un diffuseur de lumière dans un creux d'un prisme et unité lcd à rétroéclairage réalisée avec ce diffuseur

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Country Link
WO (1) WO2008111815A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09211227A (ja) * 1996-02-01 1997-08-15 Hitachi Ltd 液晶表示モジュール
KR20010048770A (ko) * 1999-11-29 2001-06-15 윤종용 백라이트 어셈블리
KR20050092257A (ko) * 2004-03-15 2005-09-21 엘지.필립스 엘시디 주식회사 프리즘 시트 및 그를 갖는 백라이트 유닛
US20060227323A1 (en) * 2005-03-16 2006-10-12 Dai Nippon Printing Co., Ltd. Converging sheet, surface light source unit, and transmission type display

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09211227A (ja) * 1996-02-01 1997-08-15 Hitachi Ltd 液晶表示モジュール
KR20010048770A (ko) * 1999-11-29 2001-06-15 윤종용 백라이트 어셈블리
KR20050092257A (ko) * 2004-03-15 2005-09-21 엘지.필립스 엘시디 주식회사 프리즘 시트 및 그를 갖는 백라이트 유닛
US20060227323A1 (en) * 2005-03-16 2006-10-12 Dai Nippon Printing Co., Ltd. Converging sheet, surface light source unit, and transmission type display

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