JPH082641Y2 - Diffusion plate for liquid crystal display - Google Patents
Diffusion plate for liquid crystal displayInfo
- Publication number
- JPH082641Y2 JPH082641Y2 JP1988083782U JP8378288U JPH082641Y2 JP H082641 Y2 JPH082641 Y2 JP H082641Y2 JP 1988083782 U JP1988083782 U JP 1988083782U JP 8378288 U JP8378288 U JP 8378288U JP H082641 Y2 JPH082641 Y2 JP H082641Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- crystal display
- plate
- diffusion plate
- 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.)
- Expired - Lifetime
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 12
- 238000009792 diffusion process Methods 0.000 title description 11
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 238000000149 argon plasma sintering Methods 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000113 methacrylic resin Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- -1 methacryloyl group Chemical group 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920005668 polycarbonate resin Polymers 0.000 description 2
- 239000004431 polycarbonate resin Substances 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- AMBJXYFIMKHOQE-UHFFFAOYSA-N 2-(2,4,6-tribromophenoxy)ethyl prop-2-enoate Chemical compound BrC1=CC(Br)=C(OCCOC(=O)C=C)C(Br)=C1 AMBJXYFIMKHOQE-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000005337 ground glass Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000006120 scratch resistant coating Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は液晶表示装置に使用する光拡散板に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a light diffusing plate used in a liquid crystal display device.
上記光拡散板にはアクリル樹脂、ポリスチレン樹脂、
ポリ塩化ビニル樹脂またはポリカーボネート樹脂のよう
な熱可塑性樹脂を用いることができ、これらの熱可塑性
樹脂にシリカ、アルミナ、各種粘土、ガラスビーズなど
の光拡散性物質を混合して光拡散性を付与した光拡散板
が広く用いられており、全光線透過率で50％、拡散光線
透過率で45％程度の性能を有している。Acrylic resin, polystyrene resin,
A thermoplastic resin such as polyvinyl chloride resin or polycarbonate resin can be used, and these thermoplastic resins are mixed with a light diffusing substance such as silica, alumina, various clays, and glass beads to impart light diffusing property. A light diffusion plate is widely used and has a performance of about 50% in total light transmittance and about 45% in diffused light transmittance.
光拡散板用途においては光拡散性能と光線透過性能の
両方が重要である。すなわち、均一な画面を得るために
光量を均一にする必要があり、光拡散性を高めなければ
ならない。一方、解像度を挙げるためには、画面を明る
くする必要があり、光線透過性（全光線透過率）の高い
ものを用いなければならない。しかしがながら、従来の
光拡散物質を含有させた光拡散板は光拡散性を向上させ
ようとすると光線透過性の低下を招き、一方、光線透過
性を上げようとすると光拡散性の低下を招き、両者を同
時に満足させることは困難であった。In light diffusion plate applications, both light diffusion performance and light transmission performance are important. That is, it is necessary to make the light amount uniform in order to obtain a uniform screen, and the light diffusivity must be improved. On the other hand, in order to increase the resolution, it is necessary to brighten the screen, and it is necessary to use one having high light transmittance (total light transmittance). However, the conventional light diffusing plate containing the light diffusing substance causes a decrease in the light transmittance when trying to improve the light diffusing property, while it causes a decrease in the light diffusing property when trying to increase the light diffusing property. It was difficult to invite them and satisfy both at the same time.
本考案は前記した従来の光拡散板の有する問題点を解
決するものである。The present invention solves the problems of the conventional light diffusion plate described above.
すなわち全光線透過率を落とさずに、かつ光拡散性が
高い拡散板を使用することにより、面照度が明るく、か
つ良好な光拡散性を有する液晶表示装置用光拡散板を提
供するものである。That is, by using a diffusion plate having a high light diffusivity without lowering the total light transmittance, a surface illuminance is bright, and a light diffusion plate for a liquid crystal display device having a good light diffusivity is provided. .
本考案は屈折率に差のある少なくとも２種類の光重合
可能なモノマーあるいはオリゴマーを含有する組成物に
紫外線を照射することにより硬化してなる光散乱樹脂板
から構成される液晶表示装置用拡散板に関する。該光散
乱樹脂板の製造方法は本願出願人による特許出願特願昭
62−197839号（特開昭64−40906号）（昭和62年８月７
日出願）「光散乱樹脂板及びその製造方法」に記載され
ているとおりである。The present invention is a diffuser plate for a liquid crystal display device, which is composed of a light-scattering resin plate obtained by curing a composition containing at least two kinds of photopolymerizable monomers or oligomers having different refractive indexes by irradiating with ultraviolet rays. Regarding The method for manufacturing the light-scattering resin plate is described in Japanese Patent Application No.
62-197839 (Japanese Patent Laid-Open No. 64-40906) (August 7, 1987)
Japanese application) As described in "Light-scattering resin plate and manufacturing method thereof".
その製造方法について概略を例示すれば、単独重合体
の屈折率がそれぞれ異なる光共重合可能なモノマーある
いはオリゴマーを少なくとも２種類以上含有する組成物
を光重合開始剤と共に基板上に塗布するかまたはセル中
に封入し、特定の紫外線を照射する。該モノマーあるい
はオリゴマーとしては、分子内にアクリロイル基、メタ
アクリロイル基、ビニル基あるいはアリル基等を有する
ものが好適なものとして例示され、光重合開始剤は通常
の光重合で使用されているものを使用することができ
る。An outline of the production method is as follows. A composition containing at least two kinds of photocopolymerizable monomers or oligomers each having a different homopolymer refractive index is applied onto a substrate together with a photopolymerization initiator or a cell It is sealed inside and irradiated with specific ultraviolet rays. As the monomer or oligomer, those having an acryloyl group, a methacryloyl group, a vinyl group, an allyl group or the like in the molecule are exemplified as suitable ones, and the photopolymerization initiator is one used in ordinary photopolymerization. Can be used.
光重合に際して用いられる基板は、塗布された膜の表
面の平滑性が得られる硝子、プラスチック、金属等の平
板あるいは型板などが使用できる。As the substrate used for the photopolymerization, a flat plate or template of glass, plastic, metal or the like which can obtain the smoothness of the surface of the coated film can be used.
また、光重合に際して用いられる紫外線ランプは通常
は水銀ランプあるいはメタルハライドランプが用いら
れ、形状は、その長軸の長さをｄ、ランプと被照射体と
の距離をｌとしたとき、その比d/lは0.2以下好ましくは
0.1であり、空極的には点光源であることが最も好まし
い。本考案にて用いられる前記光散乱樹脂板の厚さは目
的に応じて選ばれとくに限定されない。他の基材と積層
して用いる場合には20〜2000μｍのものが好ましい。Further, a mercury lamp or a metal halide lamp is usually used as an ultraviolet lamp used for photopolymerization, and its shape is the ratio d when the length of its major axis is d and the distance between the lamp and the irradiated body is l. / l is 0.2 or less, preferably
It is 0.1, and it is most preferable that it is a point light source in the air pole. The thickness of the light scattering resin plate used in the present invention is selected according to the purpose and is not particularly limited. When used by laminating with other base material, those having a thickness of 20 to 2000 μm are preferable.
本考案の液晶表示装置用拡散板は前記光散乱樹脂板を
透明ガラスまたは透明プラスチック等の透明基材表面に
被着させるか、あるいは複数の基材の間に介挿させた積
層体として形成することができる。また、摺りガラスや
フィラー添加量を少なくして光拡散性を低下させて全光
線透過率を高めた光拡散板と前記の光散乱樹脂板を積層
して用いることにより、光拡散性に優れ、かつ全光線透
過率の高い液晶表示装置用拡散板とすることもできる。The diffuser plate for a liquid crystal display device of the present invention is formed as a laminate in which the light-scattering resin plate is adhered to the surface of a transparent substrate such as transparent glass or transparent plastic, or is inserted between a plurality of substrates. be able to. Further, by using a laminated light diffusion plate and a light diffusing plate having reduced total light transmittance by reducing the light diffusivity by reducing the amount of ground glass and filler added, excellent light diffusivity, Further, it can be used as a diffusion plate for a liquid crystal display device having a high total light transmittance.
前記透明基材として用いる透明プラスチックとしては
透明であればとくに限定されないがポリカーボネイト樹
脂板、メタアクリル樹脂板、ポリスチレン樹脂などを用
いることができる。The transparent plastic used as the transparent substrate is not particularly limited as long as it is transparent, but a polycarbonate resin plate, a methacrylic resin plate, a polystyrene resin or the like can be used.
基材と光散乱樹脂板を被着させる方法はとくに限定さ
れず、公知の方法を用いることができる。薄膜に用いら
れる透明プラスチック板の外側表面には耐擦傷性被覆を
施すことが好ましい。The method of applying the substrate and the light-scattering resin plate is not particularly limited, and a known method can be used. It is preferable to provide a scratch-resistant coating on the outer surface of the transparent plastic plate used for the thin film.
本考案の液晶表示装置用拡散板は、光拡散性が高く、
かつ、全光線透過率も高いので画照度が高く、良好な解
像度を得ることができる。The diffusion plate for a liquid crystal display device of the present invention has high light diffusivity,
Moreover, since the total light transmittance is also high, the image illuminance is high, and good resolution can be obtained.
平均分子量2000のポリプロピレングリコールとトルエ
ンジイソシアネート及び２−ヒドロキシエチルアクリレ
ートの反応によって得たポリエーテルウレタンアクリレ
ート（屈折率1.481）100部に対してトリブロムフェノキ
シエチルアクリレート（屈折率1.567）100部及びベンジ
ルジメチルケタール６部を添加混合した樹脂組成物を、
1mm厚のスペーサーをはさんだ50cm×50cmの２枚の透明
メタアクリル樹脂板間に注入して膜状体とし、これに50
cmの距離から、500Wの点光源タイプの高圧水銀ランプに
より２分間の紫外線照射を行ない硬化シートを得た。
（第１図） 該硬化シートの全光線透過率及び拡散光線透過率をJI
S K−6714に準じて積分球式光線透過率測定装置を使っ
て測定した。100 parts of polyether urethane acrylate (refractive index 1.481) obtained by the reaction of polypropylene glycol having an average molecular weight of 2000 with toluene diisocyanate and 2-hydroxyethyl acrylate, 100 parts of tribromophenoxyethyl acrylate (refractive index 1.567) and benzyl dimethyl ketal A resin composition prepared by adding and mixing 6 parts,
A 50 mm x 50 cm transparent methacrylic resin plate sandwiching a 1 mm thick spacer is injected into a film-like body, and 50
From a distance of cm, ultraviolet rays were irradiated for 2 minutes with a 500 W point light source type high pressure mercury lamp to obtain a cured sheet.
(Fig. 1) JI of total light transmittance and diffuse light transmittance of the cured sheet
It measured using the integrating sphere type light transmittance measuring device according to SK-6714.
該硬化シートは全光線透過率87％、拡散光線透過率78
％であった。The cured sheet had a total light transmittance of 87% and a diffuse light transmittance of 78.
%Met.
この硬化シートを液晶表示装置用拡散板として使い、
第２図〜第４図の様な液晶表示装置を組み立てた。Using this cured sheet as a diffusion plate for liquid crystal display devices,
A liquid crystal display device as shown in FIGS. 2 to 4 was assembled.
該拡散板は従来の光拡散板（全光線透過率50％、拡散
光線透過率45％程度）に比べて光拡散性に優れ、かつ全
光線透過率も高いので、明るい画像を得ることが出来
た。Compared with the conventional light diffuser (total light transmittance 50%, diffuse light transmittance 45%), the diffuser plate has excellent light diffusivity and high total light transmittance, so bright images can be obtained. It was
第１図〜第４図は光伝送体拡散板及びそれを用いた液晶
表示装置の構成を示す。 第２図は表示装置裏面より光源を当てる方式を、第３図
は側面より光源を当てる方式を、第４図は側面より光源
を当てる方式で、導光部が鏡面板を有する薄層体の積層
体から成る構造を示している。 実線は光源からの光を光路で示し、破線は散乱光となる
様子を示す。 １……光伝送体用拡散板 ２……鏡面板 ３……光源 ４……液晶体表示部 ５……鏡面板を有する薄層体 ６……光散乱樹脂板 ７……透明メタアクリル樹脂板1 to 4 show the structures of a light transmission body diffuser plate and a liquid crystal display device using the same. FIG. 2 shows a method of applying a light source from the back surface of the display device, FIG. 3 shows a method of applying a light source from the side surface, and FIG. 4 shows a method of applying a light source from the side surface. The structure which consists of a laminated body is shown. The solid line shows the light from the light source in the optical path, and the broken line shows how it becomes scattered light. 1 ... Diffusing plate for optical transmission body 2 ... Mirror surface plate 3 ... Light source 4 ... Liquid crystal display unit 5 ... Thin layer body having mirror surface plate 6 ... Light-scattering resin plate 7 ... Transparent methacrylic resin plate
───────────────────────────────────────────────────── フロントページの続き (72)考案者 大野 哲郎 大阪府高槻市塚原２丁目10番１号 住友化 学工業株式会社内 (56)参考文献 特開 昭64−40906（ＪＰ，Ａ) 特開 昭62−174703（ＪＰ，Ａ) 特開 昭60−162611（ＪＰ，Ａ) 特公 昭58−17921（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Ohno 2-10-1 Tsukahara, Takatsuki City, Osaka Prefecture Sumitomo Kagaku Kogyo Co., Ltd. (56) Reference JP-A-64-40906 (JP, A) JP Sho 62-174703 (JP, A) JP 60-162611 (JP, A) JP 58-17921 (JP, B2)
Claims (1)
合可能なモノマーあるいはオリゴマーを含有する組成物
に紫外線を照射することにより硬化してなる光散乱樹脂
板から構成される液晶表示装置用拡散板。1. A liquid crystal display device comprising a light-scattering resin plate obtained by curing a composition containing at least two kinds of photopolymerizable monomers or oligomers having different refractive indexes by irradiating with ultraviolet rays. Diffuser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988083782U JPH082641Y2 (en) | 1988-06-23 | 1988-06-23 | Diffusion plate for liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988083782U JPH082641Y2 (en) | 1988-06-23 | 1988-06-23 | Diffusion plate for liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH025723U JPH025723U (en) | 1990-01-16 |
| JPH082641Y2 true JPH082641Y2 (en) | 1996-01-29 |
Family
ID=31308492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988083782U Expired - Lifetime JPH082641Y2 (en) | 1988-06-23 | 1988-06-23 | Diffusion plate for liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH082641Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09159837A (en) * | 1995-12-04 | 1997-06-20 | Dainippon Printing Co Ltd | Light diffusing light guide plate and manufacturing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60162611A (en) * | 1984-02-03 | 1985-08-24 | Nippon Sheet Glass Co Ltd | Preparation of synthetic resin optical element having refractive index distribution |
| JP2583519B2 (en) * | 1987-08-07 | 1997-02-19 | 日本板硝子株式会社 | Manufacturing method of light scattering resin plate |
-
1988
- 1988-06-23 JP JP1988083782U patent/JPH082641Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH025723U (en) | 1990-01-16 |
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