JPH05341128A - Illumination light guide plate for liquid crystal display and manufacture thereof - Google Patents
Illumination light guide plate for liquid crystal display and manufacture thereofInfo
- Publication number
- JPH05341128A JPH05341128A JP4149531A JP14953192A JPH05341128A JP H05341128 A JPH05341128 A JP H05341128A JP 4149531 A JP4149531 A JP 4149531A JP 14953192 A JP14953192 A JP 14953192A JP H05341128 A JPH05341128 A JP H05341128A
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- light guide
- liquid crystal
- polymer
- crystal display
- 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.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、表示が明るく、部品点
数の少ない製造安定性に優れた液晶表示装置の照明用導
光板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate for illuminating a liquid crystal display device which has a bright display and a small number of parts and is excellent in manufacturing stability.
【0002】[0002]
【従来の技術】液晶表示装置の照明は、冷陰極型蛍光放
電ランプを側面に置き、導光板で背面に光を導き、反射
板、拡散板を介して液晶表示パネルに照射する構造が一
般的である。輝度の面内均一性を確保するために、密度
分布をつけた反射パターンを導光板の裏面に印刷し、照
明ランプ以外に最低3つの部品を用いることで、低電
力、高輝度、面内均質性、薄型軽量を比較的バランスよ
く達成することができた。光の利用効率の増加、部品点
数の減少のため、光散乱用の透明微粒子を導光板中に分
布をもたせて混入させ、下面に全反射層を形成する方法
(実公 昭58−46447)が、提示されている。ま
た、乳白色光散乱体を用いる方法(特公 平3−729
68)も提示されている。2. Description of the Related Art Generally, a liquid crystal display device has a structure in which a cold cathode fluorescent discharge lamp is placed on a side surface, a light guide plate guides light to the back surface, and the liquid crystal display panel is irradiated with the light through a reflection plate and a diffusion plate. Is. To ensure in-plane uniformity of brightness, a reflective pattern with a density distribution is printed on the back surface of the light guide plate, and at least three parts other than the illumination lamp are used to achieve low power, high brightness, and in-plane homogeneity. It was possible to achieve a good balance of thinness and lightness. In order to increase the light utilization efficiency and reduce the number of parts, a method of forming a total reflection layer on the lower surface by incorporating transparent fine particles for light scattering in the light guide plate in a distributed manner (Sho 58-46447) has been proposed. Has been presented. Also, a method using a milky white light scatterer (Japanese Patent Publication No. 3-729).
68) is also presented.
【0003】最近不均一構造を有する共重合体、および
ブレンドポリマーでミクロ相分離構造を形成し、散乱角
を制御できる乳白色の高輝度光散乱伝送体が報告された
(高分子学会予稿集Vol.41,No.3(1992) IL27)。Recently, a milky-white high-brightness light-scattering transmitter capable of controlling a scattering angle by forming a microphase-separated structure with a copolymer having a heterogeneous structure and a blended polymer has been reported (Proceedings of the Polymer Society of Japan, Vol. 41, No. 3 (1992) IL27).
【0004】[0004]
【発明が解決しようとする課題】従来の液晶表示装置の
照明は、照明ランプ以外に導光板、反射板、拡散板の最
低3つの部品を用いる必要があり、光の利用効率もあま
り大きくできないという課題があった。光の利用効率を
上げるためにも、製造コストを下げるためにも、導光板
に全ての機能を盛り込んで一体化することが理想的であ
る。In the illumination of the conventional liquid crystal display device, it is necessary to use at least three parts of a light guide plate, a reflection plate, and a diffusion plate in addition to the illumination lamp, and the light utilization efficiency cannot be increased so much. There were challenges. Ideally, all the functions should be integrated into the light guide plate in order to increase the light utilization efficiency and to reduce the manufacturing cost.
【0005】従来提示された、光散乱用の透明微粒子を
導光板中に分布をもたせて混入させる方法は、製造上極
めて制御が困難であった。また、不均一構造を有する共
重合体、およびブレンドポリマーでミクロ相分離構造を
形成させる方法は、導光板の形状を得るため加熱すると
容易に相構造に変化をきたし、量産工程で導光板として
の機能を保証するには無理があった。The previously proposed method of mixing transparent fine particles for light scattering in a light guide plate so as to have a distribution is extremely difficult to control in manufacturing. In addition, the method of forming a micro phase-separated structure with a copolymer having a non-uniform structure and a blended polymer easily changes the phase structure when heated to obtain the shape of the light guide plate, and thus, the light guide plate can be used in a mass production process. It was impossible to guarantee the function.
【0006】そこで本発明はこのような課題を解決する
もので、その目的とするところは、明るさと均質性に優
れた部品点数の少ない液晶表示装置の照明用導光板及び
その製造安定性に優れた製造法を提供するところにあ
る。Therefore, the present invention solves such a problem, and an object thereof is to provide a light guide plate for illumination of a liquid crystal display device which is excellent in brightness and homogeneity and has a small number of parts, and its manufacturing stability. It provides a manufacturing method.
【0007】[0007]
【課題を解決するための手段】上記目的は、照明ランプ
を備えた液晶表装置の照明用導光板において、前記導光
板が主成分の透明ポリマーAと、光散乱用のミセル化し
たポリマーBと、界面活性剤であるABグラフトポリマ
ーまたはABブロックポリマーからなる高分子エマルジ
ョンであることで達成される。また、前記液晶表示装置
の照明用導光板は、主成分の透明ポリマーAと、Aと非
相溶のポリマーBと、ABグラフトポリマーまたはAB
ブロックポリマーを共通溶媒に溶解し、分散後溶媒を除
去して適度な径のミセルを有する高分子エマルジョンペ
レットを作成し、射出成形または熱延伸で導光板の形状
を成形することで製造できる。The above object is to provide a light guide plate for illumination of a liquid crystal display device provided with an illumination lamp, wherein the light guide plate is a transparent polymer A as a main component, and a light-scattering micellar polymer B. It is achieved by being a polymer emulsion composed of an AB graft polymer or an AB block polymer which is a surfactant. The light guide plate for illumination of the liquid crystal display device includes a transparent polymer A as a main component, a polymer B incompatible with A, an AB graft polymer or an AB.
It can be manufactured by dissolving a block polymer in a common solvent, removing the solvent after dispersion to prepare a polymer emulsion pellet having micelles having an appropriate diameter, and molding the shape of the light guide plate by injection molding or hot drawing.
【0008】[0008]
(実施例1)ポリメタクリル酸メチル(PMMA)80
重量%、ポリスチレン(PS)19.5重量%、PMM
A−PS−PMMAブロックポリマー0.5重量%を酢
酸ブチルに溶解し、攪拌分散、溶媒除去により、PMM
Aを主成分とするペレットを作成した。PMMA−PS
−PMMAブロックポリマーが界面活性剤として界面に
局在し、平均粒径0.3μmのPSミセルを安定化し、
高分子エマルジョンを形成した。押出成形により平板状
に成形して導光板とし、裏面にアルミニウムを蒸着する
ことで反射層とした。このようにして作製した導光板
の、模式的な断面図を図1に示す。平均粒径0.3μm
のPSミセルが、原料ペレット中と同様な状態で均一に
分散していた。(Example 1) Polymethylmethacrylate (PMMA) 80
% By weight, polystyrene (PS) 19.5% by weight, PMM
0.5% by weight of the A-PS-PMMA block polymer was dissolved in butyl acetate, stirred and dispersed, and the solvent was removed to give PMM.
A pellet containing A as a main component was prepared. PMMA-PS
-PMMA block polymer is localized at the interface as a surfactant to stabilize PS micelles having an average particle size of 0.3 μm,
A polymeric emulsion was formed. A light guide plate was formed by extrusion into a flat plate, and aluminum was deposited on the back surface to form a reflective layer. A schematic cross-sectional view of the light guide plate thus manufactured is shown in FIG. Average particle size 0.3 μm
The PS micelles of were uniformly dispersed in the same state as in the raw material pellets.
【0009】導光板から出射される光の散乱角度や面内
の輝度分布は、ミセルの屈折率、粒径分布、密度分布等
により制御できる。本実施例のように原料ペレットの相
分離構造が成形後も維持されれば、材料設計が容易にで
き、導光板の特性も設計通りに管理することができる。
照明ランプから導光板の側面に入射した光は、吸収損失
をほとんど起こさず、ミセル界面における回折により表
面からほぼ垂直に出射してきた。また、表面内の輝度均
一性は、90%以上であった。The scattering angle of the light emitted from the light guide plate and the in-plane brightness distribution can be controlled by the refractive index of the micelles, the particle size distribution, the density distribution and the like. If the phase-separated structure of the raw material pellets is maintained after molding as in this embodiment, the material design can be facilitated and the characteristics of the light guide plate can be managed as designed.
The light incident on the side surface of the light guide plate from the illumination lamp causes almost no absorption loss and is emitted almost vertically from the surface due to diffraction at the micelle interface. The brightness uniformity on the surface was 90% or more.
【0010】このようにして作製した導光板を用いた液
晶表示装置の、模式的な断面図を図2に示す。図2にお
いて、21は液晶パネル、22は導光板、23が照明ラ
ンプである。同様の照明ランプを用いた従来のバックラ
イトに比べ、表示表面における輝度は60カンデラから
80カンデラに向上した。個体間のばらつきがほとんど
なく、明るく見やすいディスプレイを達成できた。ま
た、熱、湿度、耐光等の信頼性も十分であった。FIG. 2 shows a schematic sectional view of a liquid crystal display device using the light guide plate thus manufactured. In FIG. 2, 21 is a liquid crystal panel, 22 is a light guide plate, and 23 is an illumination lamp. The brightness on the display surface was improved from 60 candelas to 80 candelas as compared with the conventional backlight using the same illumination lamp. We were able to achieve a bright and easy-to-see display with little variation between individuals. Also, the reliability of heat, humidity, light resistance, etc. was sufficient.
【0011】(実施例2)ポリアクリル酸メチル(PM
A)70重量%、PS29.7重量%、PMAとPSを
グラフト鎖にもつポリマー0.3重量%をトルエンに加
熱溶解し、攪拌分散、溶媒除去により、PMAを主成分
とするペレットを作成した。PMA−PSグラフトポリ
マーが界面活性剤として界面に局在し、平均粒径0.8
μmのPSミセルを安定化し、高分子エマルジョンを形
成した。射出成形により、表面に微細な凹凸面を備えた
くさび状に成形して導光板とし、裏面にアルミニウムを
蒸着することで反射層とした。このようにして作製した
導光板の、模式的な断面図を図3に示す。平均粒径0.
8μmのPSミセルが、原料ペレット中と同様な状態で
均一に分散していた。(Example 2) Polymethyl acrylate (PM
A) 70% by weight, PS 29.7% by weight, and 0.3% by weight of a polymer having PMA and PS in the graft chain were dissolved in toluene by heating, and dispersed by stirring and removing the solvent to prepare pellets containing PMA as a main component. .. The PMA-PS graft polymer is localized at the interface as a surfactant and has an average particle size of 0.8.
The μm PS micelles were stabilized to form a polymer emulsion. A light guide plate was formed by injection molding into a wedge shape having fine uneven surfaces, and aluminum was deposited on the back surface to form a reflective layer. A schematic cross-sectional view of the light guide plate thus manufactured is shown in FIG. Average particle size 0.
8 μm PS micelles were uniformly dispersed in the same state as in the raw material pellets.
【0012】導光板から出射される光の散乱角度や面内
の輝度分布は、ミセルの屈折率、粒径分布、密度分布等
により制御できる。照明ランプからくさび状導光板の厚
い側面に入射した光は、ミセル界面における回折と表面
による乱反射により、垂直方向を極大値にもつ角度分布
をとって出射してきた。また、表面内の輝度均一性は9
0%以上であった。The scattering angle of the light emitted from the light guide plate and the in-plane brightness distribution can be controlled by the refractive index of the micelles, the particle size distribution, the density distribution and the like. The light incident on the thick side surface of the wedge-shaped light guide plate from the illumination lamp is emitted with an angular distribution having a maximum value in the vertical direction due to diffraction at the micelle interface and diffuse reflection by the surface. The brightness uniformity on the surface is 9
It was 0% or more.
【0013】このようにして作製した導光板を用いた液
晶表示装置は、同様の照明ランプを用いた従来のバック
ライトに比べ、表示表面における輝度は50カンデラか
ら70カンデラに向上した。個体間のばらつきがほとん
どなく、明るく見やすいディスプレイを達成できた。ま
た、熱、湿度、耐光等の信頼性も十分であった。In the liquid crystal display device using the light guide plate thus manufactured, the brightness on the display surface is improved from 50 candela to 70 candela, as compared with the conventional backlight using the same illumination lamp. We were able to achieve a bright and easy-to-see display with little variation between individuals. Also, the reliability of heat, humidity, light resistance, etc. was sufficient.
【0014】(実施例3)ポリメタクリル酸メチル(P
MMA)90重量%、ポリ酢酸ビニル(PVAc)9.
8重量%、PMMAとPVAcをグラフト鎖にもつポリ
マー0.2重量%をメチルエチルケトンに溶解し、攪拌
分散、溶媒除去により、PMMAを主成分とするペレッ
トを作成した。PMMA−PVAcグラフトポリマーが
界面活性剤として界面に局在し、平均粒径0.15μm
のPVAcミセルを安定化し、高分子エマルジョンを形
成した。射出成形により、U字状に成形して導光板と
し、裏面にアルミニウムを蒸着することで反射層とし
た。このようにして作製した導光板の、模式的な断面図
を図4に示す。平均粒径0.15μmのPVAcミセル
が、原料ペレット中と同様な状態で均一に分散してい
た。Example 3 Polymethylmethacrylate (P
MMA) 90% by weight, polyvinyl acetate (PVAc) 9.
Pellets containing PMMA as a main component were prepared by dissolving 8% by weight and 0.2% by weight of a polymer having PMMA and PVAc in a graft chain in methyl ethyl ketone, dispersing by stirring and removing the solvent. PMMA-PVAc graft polymer is localized at the interface as a surfactant and has an average particle size of 0.15 μm.
The PVAc micelles of Example 1 were stabilized to form a polymer emulsion. A light guide plate was formed into a U shape by injection molding, and aluminum was deposited on the back surface to form a reflective layer. A schematic cross-sectional view of the light guide plate thus manufactured is shown in FIG. PVAc micelles having an average particle diameter of 0.15 μm were uniformly dispersed in the same state as in the raw material pellets.
【0015】導光板から出射される光の散乱角度や面内
の輝度分布は、ミセルの屈折率、粒径分布、密度分布等
により制御できる。両側に配置した2本の照明ランプか
らU字状導光板の厚い側面に入射した光は、ミセル界面
における回折により表面からほぼ垂直方向に出射してき
た。また、表面内の輝度均一性は90%以上であった。The scattering angle of the light emitted from the light guide plate and the in-plane brightness distribution can be controlled by the refractive index of the micelles, the particle size distribution, the density distribution and the like. Light incident on the thick side surface of the U-shaped light guide plate from the two illumination lamps arranged on both sides is emitted from the surface in a substantially vertical direction due to diffraction at the micelle interface. The brightness uniformity on the surface was 90% or more.
【0016】このようにして作製した導光板を用いた液
晶表示装置は、同様の照明ランプを用いた従来のバック
ライトに比べ、表示表面における輝度は70カンデラか
ら90カンデラに向上した。個体間のばらつきがほとん
どなく、明るく見やすいディスプレイを達成できた。ま
た、熱、湿度、耐光等の信頼性も十分であった。In the liquid crystal display device using the light guide plate thus manufactured, the brightness on the display surface is improved from 70 candela to 90 candela, as compared with the conventional backlight using the same illumination lamp. We were able to achieve a bright and easy-to-see display with little variation between individuals. Also, the reliability of heat, humidity, light resistance, etc. was sufficient.
【0017】[0017]
【発明の効果】以上述べたように、本発明によれば照明
ランプを備えた液晶表装置の照明用導光板において、前
記導光板が主成分の透明ポリマーAと、光散乱用のミセ
ル化したポリマーBと、界面活性剤であるABグラフト
ポリマーまたはABブロックポリマーからなる高分子エ
マルジョンであることにより、明るさと均質性に優れた
部品点数の少ない液晶表示装置の照明が可能となった。As described above, according to the present invention, in the illuminating light guide plate of the liquid crystal display device having the illuminating lamp, the light guide plate is made into the transparent polymer A as the main component and the micelle for light scattering. By using a polymer emulsion composed of polymer B and an AB graft polymer or an AB block polymer which is a surfactant, it is possible to illuminate a liquid crystal display device having excellent brightness and homogeneity and a small number of parts.
【0018】また、前記液晶表示装置の照明用導光板
は、主成分の透明ポリマーAと、Aと非相溶のポリマー
Bと、ABグラフトポリマーまたはABブロックポリマ
ーを共通溶媒に溶解し、分散後溶媒を除去して適度な径
のミセルを有する高分子エマルジョンペレットを作成し
た後、射出成形または押出成形で導光板の形状を成形す
ることで安定に製造することが可能となった。照明の構
成部品点数を減らすことができたため、光の利用効率が
上がり製造コストを下げることができた。Further, in the light guide plate for illumination of the liquid crystal display device, a transparent polymer A as a main component, a polymer B incompatible with A, and an AB graft polymer or an AB block polymer are dissolved in a common solvent and dispersed. After the solvent was removed to prepare polymer emulsion pellets having micelles with a proper diameter, the light guide plate was molded by injection molding or extrusion molding, which enabled stable manufacture. Since it was possible to reduce the number of components of the lighting, it was possible to improve the utilization efficiency of light and reduce the manufacturing cost.
【図1】本発明の実施例1における導光板の概念を模式
的に表す断面図である。FIG. 1 is a cross-sectional view schematically showing the concept of a light guide plate in Example 1 of the present invention.
【図2】本発明の実施例1における液晶表示装置の概念
を模式的に表す断面図である。FIG. 2 is a cross-sectional view schematically showing the concept of the liquid crystal display device according to the first embodiment of the present invention.
【図3】本発明の実施例2における導光板の概念を模式
的に表す断面図である。FIG. 3 is a sectional view schematically showing the concept of a light guide plate in Example 2 of the present invention.
【図4】本発明の実施例3における導光板の概念を模式
的に表す断面図である。FIG. 4 is a sectional view schematically showing the concept of a light guide plate in Example 3 of the present invention.
11‥‥‥‥‥透明層(ポリマーA) 12‥‥‥‥‥ミセル(ポリマーB) 13‥‥‥‥‥反射層 21‥‥‥‥‥液晶パネル 22‥‥‥‥‥導光板 23‥‥‥‥‥表示ランプ 31‥‥‥‥‥凹凸面 11 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥・ ・ ・ ‥ Indicator lamp 31 ‥‥‥‥‥‥
Claims (5)
導光板において、前記導光板が主成分の透明ポリマーA
と、光散乱用のミセル化したポリマーBと、界面活性剤
であるABグラフトポリマーまたはABブロックポリマ
ーからなる高分子エマルジョンであることを特徴とする
液晶表示装置の照明用導光板。1. A light guide plate for illumination of a liquid crystal display device provided with an illumination lamp, wherein the light guide plate is a transparent polymer A containing a main component.
A light-guiding plate for illumination of a liquid crystal display device, which is a polymer emulsion comprising a micelle polymer B for light scattering and an AB graft polymer or an AB block polymer as a surfactant.
がくさび状、またはU字状であることを特徴とする請求
項1記載の液晶表示装置の照明用導光板。2. The illumination light guide plate of a liquid crystal display device according to claim 1, wherein the illumination light guide plate of the liquid crystal display device has a wedge shape or a U shape.
に、全反射用の金属層が形成されていることを特徴とす
る請求項1記載の液晶表示装置の照明用導光板。3. The light guide plate for illumination of a liquid crystal display device according to claim 1, wherein a metal layer for total reflection is formed on the back surface of the light guide plate for illumination of the liquid crystal display device.
に、光散乱のための微細な凹凸面を備えていることを特
徴とする請求項1記載の液晶表示装置の照明用導光板。4. The light guide plate for illumination of a liquid crystal display device according to claim 1, wherein the light guide plate for illumination of the liquid crystal display device is provided with a fine uneven surface for scattering light.
導光板の製造において、主成分の透明ポリマーAと、A
と非相溶のポリマーBと、ABグラフトポリマーまたは
ABブロックポリマーを共通溶媒に溶解し、分散後溶媒
を除去して適度な径のミセルを有する高分子エマルジョ
ンペレットを作成し、射出成形または押出成形で導光板
の形状に成形することを特徴とする液晶表示装置の照明
用導光板の製造方法。5. A transparent polymer A as a main component in the manufacture of a light guide plate for illumination of a liquid crystal display device equipped with an illumination lamp,
Polymer B, which is incompatible with, and AB graft polymer or AB block polymer are dissolved in a common solvent, and after dispersion, the solvent is removed to prepare polymer emulsion pellets having micelles of appropriate diameter, and injection molding or extrusion molding is performed. A method for manufacturing a light guide plate for illumination of a liquid crystal display device, characterized in that the light guide plate is formed into a shape of a light guide plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4149531A JPH05341128A (en) | 1992-06-09 | 1992-06-09 | Illumination light guide plate for liquid crystal display and manufacture thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4149531A JPH05341128A (en) | 1992-06-09 | 1992-06-09 | Illumination light guide plate for liquid crystal display and manufacture thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05341128A true JPH05341128A (en) | 1993-12-24 |
Family
ID=15477178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4149531A Pending JPH05341128A (en) | 1992-06-09 | 1992-06-09 | Illumination light guide plate for liquid crystal display and manufacture thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05341128A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108415194A (en) * | 2018-03-09 | 2018-08-17 | 广州林电智能科技有限公司 | LED backlight plate |
-
1992
- 1992-06-09 JP JP4149531A patent/JPH05341128A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108415194A (en) * | 2018-03-09 | 2018-08-17 | 广州林电智能科技有限公司 | LED backlight plate |
CN108415194B (en) * | 2018-03-09 | 2021-06-04 | 广州林电智能科技有限公司 | LED backlight plate |
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