WO2010041768A1 - 導光板 - Google Patents

導光板 Download PDF

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Publication number
WO2010041768A1
WO2010041768A1 PCT/JP2009/067945 JP2009067945W WO2010041768A1 WO 2010041768 A1 WO2010041768 A1 WO 2010041768A1 JP 2009067945 W JP2009067945 W JP 2009067945W WO 2010041768 A1 WO2010041768 A1 WO 2010041768A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
fine particles
light guide
light
refractive index
Prior art date
Application number
PCT/JP2009/067945
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
金光昭佳
Original Assignee
住友化学株式会社
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 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN200980139166.9A priority Critical patent/CN102171506B/zh
Publication of WO2010041768A1 publication Critical patent/WO2010041768A1/ja

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • 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

Definitions

  • the present invention relates to a light guide plate that contains fine particles for light scattering and has sufficiently suppressed yellowness.
  • a cold cathode lamp is disposed on the side of a light guide plate, and light from the cold cathode lamp is reflected by a dot pattern or a prism portion formed on the back surface of the light guide plate. It is known that the light can be uniformly emitted from the front surface of the light guide plate.
  • a light guide plate for a backlight a light guide plate in which fine particles are dispersed in a transparent resin such as an acrylic resin is known, and this light guide plate can scatter light by containing fine particles. It has excellent luminance uniformity (see Japanese Patent Application Laid-Open No. 2001-76522 (Patent Document 1)).
  • the present invention has been made in view of such technical background, and includes a light guide plate capable of emitting light with sufficiently suppressed yellowness while containing fine particles for light scattering, and high whiteness.
  • An object of the present invention is to provide a surface light source device capable of emitting light and a liquid crystal display device capable of realizing a natural and high-quality color display. The present invention provides the following means.
  • a light guide plate in which fine particles are dispersed in a transparent resin When the absolute value of the difference between the refractive index of the transparent resin and the refractive index of the fine particles is “ ⁇ n” and the cumulative 50% particle diameter of the fine particles is “D 50 ” ( ⁇ m), 0.30 ⁇ ⁇ n ⁇ D The relational expression 50 ⁇ 0.70 holds, A light guide plate, wherein an average light transmittance of visible light measured at an optical path length of 300 mm is 35% or more.
  • a surface light source device comprising the light guide plate according to any one of items 1 to 5.
  • a liquid crystal display device characterized in that the surface light source device according to item 6 is disposed on the back side of the liquid crystal panel.
  • the absolute value ( ⁇ n) of the difference between the refractive index of the transparent resin and the refractive index of the fine particles is 0.08 to 0.13.
  • the content of fine particles required for light scattering is small, and the processability can be improved by reducing the fine particle content.
  • the transparent resin is PMMA
  • the fine particles are styrene polymer fine particles, and both the PMMA and the styrene polymer have low light absorption and high transparency, thereby further improving the luminance.
  • FIG. 1 is a schematic side view showing an embodiment of a liquid crystal display device according to the present invention.
  • FIG. 2 is an explanatory diagram of a method for measuring the average light transmittance of visible light with an optical path length of 300 mm.
  • the liquid crystal display device (1) includes a surface light source device (9) and a liquid crystal panel (30) disposed on the front side of the surface light source device (9).
  • the liquid crystal panel (30) includes a liquid crystal cell (20) in which a liquid crystal (11) is sealed between a pair of upper and lower transparent electrodes (12) and (13) arranged in parallel and spaced apart from each other.
  • the liquid crystal cell (20) includes polarizing plates (14) and (15) disposed on both upper and lower sides. These constituent members (11), (12), (13), (14), and (15) constitute an image display unit.
  • An alignment film (not shown) is laminated on the inner surfaces (surfaces on the liquid crystal side) of the transparent electrodes (12) and (13).
  • the surface light source device (9) is disposed on the lower surface side (rear surface side) of the lower polarizing plate (15).
  • the surface light source device (9) includes a thin box-shaped lamp box (5) having a rectangular shape in plan view and an open upper surface (front surface), and a light guide plate (5) accommodated in the lamp box (5). 3) and a light source (2), and a light diffusing plate (4) mounted and fixed to the lamp box (5) so as to close its open surface.
  • the said light source (2) is arrange
  • the lamp box (5) is made of a white acrylic resin plate.
  • a dot printing portion made of white ink is formed, and light incident from one side surface into the light guide plate (3) from the light source (2) is received.
  • the light is uniformly emitted from the front surface of the light guide plate, that is, the light emitting surface (3b), by being reflected by the dot printing unit.
  • the said light-guide plate (3) consists of a plate-shaped body of the resin composition by which microparticles
  • the light guide plate (3) is configured to satisfy the following relational expression.
  • the light guide plate (3) is composed of transparent resin and fine particles that satisfy such a relational expression. Further, the light guide plate (3) has an average light transmittance of 35% or more measured with an optical path length of 300 mm.
  • the light guide plate (3) according to the above configuration is configured such that a relational expression of 0.30 ⁇ ⁇ n ⁇ D 50 ⁇ 0.70 is established, and the fine particles satisfying such a relational expression have any wavelength of visible light.
  • the liquid crystal display device (1) Since the light can be scattered to the same extent, the yellowness of the light emitted from the light emitting surface (3b) of the light guide plate (3) is sufficiently reduced, and the whiteness that is not substantially yellowish is obtained. High light can be emitted. Moreover, since the average light transmittance of visible light measured with the optical path length of 300 mm is 35% or more, high-intensity light can be emitted. Accordingly, in the liquid crystal display device (1), light having a high whiteness that is not substantially yellowish is emitted from the surface light source device (9) toward the liquid crystal panel (30) with high brightness. The color of the panel (30) can be accurately reproduced, and a natural and high-quality bright color display can be realized without being yellowish.
  • the light guide plate (3) is not particularly limited as long as it is a plate-shaped body of a resin composition in which fine particles are dispersed in a transparent resin. Any light guide plate can be used.
  • the transparent resin include methacrylic resin (PMMA, etc.), polycarbonate resin, ABS resin (acrylonitrile-styrene-butadiene copolymer resin), MS resin (methyl methacrylate-styrene copolymer resin), polystyrene resin, AS resin.
  • the fine particles are not particularly limited as long as they are fine particles having a refractive index different from that of the transparent resin constituting the light guide plate (3) and can diffuse transmitted light.
  • inorganic particles such as glass beads, silica particles, aluminum hydroxide particles, calcium carbonate particles, barium sulfate particles, titanium oxide particles, talc, styrene polymer particles, acrylic polymer particles, siloxane polymer particles, etc. Resin particles and the like.
  • the cumulative 50% particle diameter (D 50 ) of the fine particles is preferably in the range of 3 to 7 ⁇ m.
  • the transmitted light can be sufficiently scattered, and when it is 7 ⁇ m or less, the surface of the light guide plate (3) such as the light exit surface (3b) can be made smoother.
  • the absolute value ⁇ n of the difference between the refractive index of the transparent resin and the refractive index of the fine particles is preferably set to 0.08 to 0.13. If the absolute value ⁇ n of the difference in refractive index is within such a range, the content of fine particles required to obtain desired light scattering is small, and the workability can be improved by reducing the fine particle content. There are advantages.
  • the content of the fine particles in the light guide plate (3) is preferably set to 0.2 to 20 ppm.
  • the transmitted light can be sufficiently scattered, and by setting the concentration to 20 ppm or less, uneven distribution of fine particles due to aggregation of the fine particles can be reduced.
  • the content of fine particles in the light guide plate (3) is more preferably set to 0.5 to 10 ppm.
  • the light guide plate (3) may contain various additives such as an ultraviolet absorber, a heat stabilizer, an antioxidant, a weathering agent, a light stabilizer, a fluorescent brightener, and a processing stabilizer.
  • fine particles other than the fine particles satisfying the specific relational expression can be added as long as the effects of the present invention are not significantly impaired.
  • the thickness of the light guide plate (3) is not particularly limited, but is usually 0.05 to 15 mm, preferably 0.1 to 10 mm, and more preferably 0.5 to 5 mm.
  • the light guide plate (3) since the light guide plate (3) has an average light transmittance of visible light measured at an optical path length of 300 mm of 35% or more, high brightness can be achieved.
  • the light guide plate (3) preferably has an average visible light transmittance of 50% or more measured at an optical path length of 300 mm, particularly preferably 60% or more.
  • molding method can be used as a shaping
  • the light guide plate (3) may be subjected to the following processing. That is, for example, the peripheral side surface (51) may be polished, the light emitting surface (3b) may be subjected to light diffusion processing to make uniform light, and the back surface (3a) may be white.
  • Light diffusion processing such as dot printing using ink or the like, formation of a prism, or the like, or light such as a silver-deposited sheet or film on a surface other than the light emitting surface (3b) of the light guide plate A reflective layer may be provided.
  • a configuration in which the light source (2) is disposed on each of a pair of opposing side surfaces of the light guide plate (3) may be employed.
  • the light source (2) is not particularly limited.
  • a linear light source such as a cold cathode tube, a hot cathode tube, or an EEFL (external electrode fluorescent lamp), a light emitting diode (LED) or the like is used.
  • a point light source or the like is used.
  • the light guide plate (3), the surface light source device (9) and the liquid crystal display device (1) according to the present invention are not particularly limited to those of the above-described embodiment, and the spirit thereof is within the scope of the claims. Any design changes are allowed as long as they do not deviate.
  • Example 1 PMMA (polymethyl methacrylate) (“SUMIPEX EXN” manufactured by Sumitomo Chemical Co., Ltd., refractive index: 1.49) and polystyrene resin fine particles (“SBX-4” manufactured by Sekisui Plastics Co., Ltd.), refractive index: 1.59 ) Is mixed with a Henschel mixer so that the content is 0.5 ppm, melt-kneaded with a single screw extruder with a screw diameter of 40 mm, and extruded from a T die at a resin temperature of 265 ° C.
  • PMMA polymethyl methacrylate
  • SBX-4 polystyrene resin fine particles
  • a light guide plate of 4 mm and a width of 20 cm was produced.
  • the cumulative 50% particle diameter (D 50 ) of the polystyrene resin fine particles was 3.7 ( ⁇ m).
  • D 50 The cumulative 50% particle diameter of the polystyrene resin fine particles was 3.7 ( ⁇ m).
  • Example 2> A light guide plate was produced in the same manner as in Example 1 except that the content of the polystyrene resin fine particles was set to 1 ppm.
  • Example 4> A light guide plate was produced in the same manner as in Example 1 except that the content of the polystyrene resin fine particles was set to 10 ppm.
  • Example 5 PMMA (polymethyl methacrylate) (“SUMIPEX EXN” manufactured by Sumitomo Chemical Co., Ltd., refractive index: 1.49) and polystyrene resin fine particles (“SBX-6” manufactured by Sekisui Plastics Co., Ltd.), refractive index: 1.59 ) Is mixed with a Henschel mixer so that the content is 0.5 ppm, melt-kneaded with a single screw extruder with a screw diameter of 40 mm, and extruded from a T die at a resin temperature of 265 ° C. A light guide plate of 4 mm and a width of 20 cm was produced.
  • PMMA polymethyl methacrylate
  • SBX-6 polystyrene resin fine particles
  • the cumulative 50% particle diameter (D 50 ) of the polystyrene resin fine particles was 5.8 ( ⁇ m).
  • D 50 The cumulative 50% particle diameter of the polystyrene resin fine particles was 5.8 ( ⁇ m).
  • the cumulative 50% particle diameter (D 50 ) of the polystyrene resin fine particles was 2.8 ( ⁇ m).
  • D 50 The cumulative 50% particle diameter (D 50 ) of the polystyrene resin fine particles was 2.8 ( ⁇ m).
  • ⁇ Comparative Example 3> A light guide plate was produced in the same manner as in Comparative Example 2 except that the content of the polystyrene resin fine particles was set to 1 ppm.
  • ⁇ Comparative example 4> A light guide plate was produced in the same manner as in Comparative Example 2 except that the content of the polystyrene resin fine particles was set to 3 ppm.
  • the cumulative 50% particle diameter (D 50 ) of the acrylic resin fine particles was 2.0 ( ⁇ m).
  • the cumulative 50% particle diameter (D 50 ) is determined by measuring the particle diameter and volume of all particles, and integrating the volume sequentially from the smallest particle diameter, and the accumulated volume is 50% of the total volume of all particles.
  • the particle diameter of the particles to be Each light guide plate obtained as described above was evaluated according to the following evaluation method. The results are shown in Tables 1 and 2. ⁇ Measurement method of average light transmittance of visible light at optical path length of 300 mm> As shown in FIG. 2, the obtained light guide plate was cut into a size of 50 mm in width and 300 mm in length, and then the four side surfaces (51) were polished with a polishing machine (“Pura Beauty 1000” manufactured by Asahi Megaro). A test specimen (50) was prepared.
  • Each of these test specimens was measured in increments of 5 nm in a wavelength range of 380 to 780 nm with an optical path length of 300 mm using a Hitachi plastic property measurement system (configured with a U-3410 spectrophotometer and a large sample chamber integrating sphere accessory).
  • the light transmittance for each wavelength was measured, and the arithmetic average value of the light transmittance thus obtained was defined as “average light transmittance of visible light”.
  • ⁇ YI (Yellow Index) Evaluation Method> As shown in FIG. 2, the obtained light guide plate was cut into a size of 50 mm in width and 300 mm in length, and then the four side surfaces (51) were polished with a polishing machine (“Pura Beauty 1000” manufactured by Asahi Megaro).
  • test specimen (50) was prepared. Each of these test specimens was measured in increments of 5 nm in a wavelength range of 380 to 780 nm with an optical path length of 300 mm using a Hitachi plastic property measurement system (configured with a U-3410 spectrophotometer and a large sample chamber integrating sphere accessory). The light transmittance for each wavelength was measured, and YI (yellow index) was calculated from this. In addition, the thing whose YI is 2.0 or less was set as the pass. As is apparent from Table 1, the light guide plates of Examples 1 to 7 of the present invention have a sufficiently reduced YI, and therefore can emit light with high whiteness that is not substantially yellowish.
  • YI was a large value in the light guide plates of Comparative Examples 1 to 8 that deviated from the specified range of the present invention. From the comparison between Examples 1 and 5 and Comparative Examples 2 and 6, when ( ⁇ n ⁇ D 50 ) is smaller than 0.30, YI is larger, and ( ⁇ n ⁇ D 50 ) is larger than 0.70. It can be seen that YI increases, whereas YI is sufficiently small when ( ⁇ n ⁇ D 50 ) is in the range of 0.30 to 0.70.
  • the light guide plate according to the present invention is suitably used as a light guide plate for a surface light source device, but is not particularly limited to such applications.
  • the surface light source device of the present invention is suitably used as a backlight for a liquid crystal display device, but is not particularly limited to such applications, for example, for other display devices, lighting devices, signboards. Etc.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Elements Other Than Lenses (AREA)
PCT/JP2009/067945 2008-10-09 2009-10-08 導光板 WO2010041768A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200980139166.9A CN102171506B (zh) 2008-10-09 2009-10-08 导光板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-262687 2008-10-09
JP2008262687A JP4933512B2 (ja) 2008-10-09 2008-10-09 導光板

Publications (1)

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WO2010041768A1 true WO2010041768A1 (ja) 2010-04-15

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JP (1) JP4933512B2 (zh)
KR (1) KR20110070999A (zh)
CN (1) CN102171506B (zh)
TW (1) TWI434080B (zh)
WO (1) WO2010041768A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8217066B2 (en) 2009-10-01 2012-07-10 Amira Pharmaceuticals, Inc. Compounds as lysophosphatidic acid receptor antagonists
WO2012105294A1 (ja) * 2011-01-31 2012-08-09 住友化学株式会社 導光板用紫外線硬化型インクジェットインク及びこれを用いた導光板
CN102675790A (zh) * 2011-03-09 2012-09-19 住友化学株式会社 导光板用树脂组合物以及导光板
CN102959313A (zh) * 2010-06-24 2013-03-06 东洋苯乙烯股份有限公司 苯乙烯系导光板
US8778983B2 (en) 2009-10-01 2014-07-15 Amira Pharmaceuticals, Inc. Polycyclic compounds as lysophosphatidic acid receptor antagonists

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5496799B2 (ja) * 2010-07-08 2014-05-21 株式会社クラレ 発光体
WO2012111806A1 (ja) * 2011-02-18 2012-08-23 住友化学株式会社 検査装置および検査方法、並びに当該検査方法を用いた製造方法
TWI424220B (zh) * 2011-03-08 2014-01-21 Tpv Display Technology Xiamen 顯示器結構
JP6666065B2 (ja) 2014-09-30 2020-03-13 エルジー ディスプレイ カンパニー リミテッド 液晶表示装置
CN104991304B (zh) * 2015-06-25 2019-02-22 东莞轩朗实业有限公司 导光板、油墨及喷墨打印导光板制作方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004327204A (ja) * 2003-04-24 2004-11-18 Asahi Kasei Chemicals Corp 光拡散層一体型導光板

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
KR101244188B1 (ko) * 2005-02-28 2013-03-18 가부시키가이샤 구라레 광확산 필름 및 이것을 이용한 면광원 소자 그리고 액정표시 장치
JP5063873B2 (ja) * 2005-07-05 2012-10-31 出光興産株式会社 光拡散性ポリカーボネート系樹脂組成物、および同樹脂組成物を用いた光拡散板
JP2007048465A (ja) * 2005-08-05 2007-02-22 Mitsubishi Rayon Co Ltd Ｌｅｄ面光源装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004327204A (ja) * 2003-04-24 2004-11-18 Asahi Kasei Chemicals Corp 光拡散層一体型導光板

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8217066B2 (en) 2009-10-01 2012-07-10 Amira Pharmaceuticals, Inc. Compounds as lysophosphatidic acid receptor antagonists
US8778983B2 (en) 2009-10-01 2014-07-15 Amira Pharmaceuticals, Inc. Polycyclic compounds as lysophosphatidic acid receptor antagonists
CN102959313A (zh) * 2010-06-24 2013-03-06 东洋苯乙烯股份有限公司 苯乙烯系导光板
WO2012105294A1 (ja) * 2011-01-31 2012-08-09 住友化学株式会社 導光板用紫外線硬化型インクジェットインク及びこれを用いた導光板
CN102675790A (zh) * 2011-03-09 2012-09-19 住友化学株式会社 导光板用树脂组合物以及导光板

Also Published As

Publication number Publication date
KR20110070999A (ko) 2011-06-27
JP4933512B2 (ja) 2012-05-16
TW201033661A (en) 2010-09-16
JP2010092755A (ja) 2010-04-22
CN102171506B (zh) 2015-03-04
CN102171506A (zh) 2011-08-31
TWI434080B (zh) 2014-04-11

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