JP2706473B2 - Color liquid crystal display - Google Patents
Color liquid crystal displayInfo
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- JP2706473B2 JP2706473B2 JP63170537A JP17053788A JP2706473B2 JP 2706473 B2 JP2706473 B2 JP 2706473B2 JP 63170537 A JP63170537 A JP 63170537A JP 17053788 A JP17053788 A JP 17053788A JP 2706473 B2 JP2706473 B2 JP 2706473B2
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- liquid crystal
- color
- refractive index
- crystal display
- polarized light
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Description
【発明の詳細な説明】 〔概要〕 表示用STN（Super twisted Nematie）液晶層と光学補
償層とを重ね、表示用STN液晶層の複屈折で生じた着色
を光学補償層で補償するようにした液晶表示装置に関
し、 光学補償層を低コストに構成することを目的とし、 光学補償層を屈折率の異方性を有する透明フィルムで
構成し、これを上記カラーフィルタの各色に対して夫々
設け、屈折率の異方性とフィルム厚との積を各色に対し
て夫々異ならしめて構成する。DETAILED DESCRIPTION OF THE INVENTION [Summary] A display STN (Super twisted Nematie) liquid crystal layer and an optical compensation layer are overlapped with each other, and coloring caused by birefringence of the display STN liquid crystal layer is compensated by the optical compensation layer. Regarding the liquid crystal display device, with the aim of configuring the optical compensation layer at low cost, the optical compensation layer is composed of a transparent film having anisotropy of the refractive index, which is provided for each color of the color filter, The product of the anisotropy of the refractive index and the film thickness is different for each color.
本発明は、表示用STN液晶層と光学補償層とを重ね、
表示用STN液晶層の複屈折で生じた着色を光学補償層で
補償するようにした液晶表示装置に関する。The present invention overlaps the display STN liquid crystal layer and the optical compensation layer,
The present invention relates to a liquid crystal display device in which coloring caused by birefringence of a display STN liquid crystal layer is compensated by an optical compensation layer.
近年、単純マトリクス方式の白黒表示液晶パネルの開
発が盛んに行なわれており、特に、カラーフィルタと組
合わせて大容量表示可能なカラー液晶表示装置の実現が
要求されている。この場合、一般に、表示用STN液晶セ
ルでは複屈折によって不必要な着色を呈し、この影響を
なくすためにはこの不必要な着色を補償する安価で良質
な光学補償板が必要である。2. Description of the Related Art In recent years, development of a simple matrix black-and-white display liquid crystal panel has been actively carried out, and in particular, realization of a color liquid crystal display device capable of large-capacity display in combination with a color filter is required. In this case, in general, an STN liquid crystal cell for display exhibits unnecessary coloring due to birefringence, and in order to eliminate this effect, an inexpensive and high-quality optical compensator for compensating for the unnecessary coloring is required.
上記光学補償板を設けられた液晶表示装置として、従
来、例えば、特開昭57−96315号公報（特願昭55−17440
6号）記載の「二層型液晶表示装置」や特願昭62−23534
5号の「液晶表示装置」等が提案されている。このよう
な光学補償板を用いた液晶表示装置は、偏光子及び表示
用液晶セル（一般に複屈折性を有する）を透過した光線
が旋光分散現象のために楕円偏光となって着色を呈する
いわゆる色付き現象を軽減するために、表示用液晶セル
の液晶分子ツィスト方向と逆のツィスト方向をもつ補償
用液晶セルを新たに設け、表示用液晶セルで生じた楕円
偏光を元の直線偏光に戻し、偏光子にて阻止して黒表示
とする。この場合、液晶セルは液晶分子ツィスト方向が
逆である以外は殆ど同一条件のもとに作られており、液
晶セルでの旋光分散現象を液晶セルで補償する。As a liquid crystal display device provided with the above-mentioned optical compensator, a conventional liquid crystal display device is disclosed, for example, in JP-A-57-96315 (Japanese Patent Application No. 55-17440).
No. 6), “Two-layer liquid crystal display device” and Japanese Patent Application No. 62-23534.
No. 5 “Liquid crystal display device” and the like have been proposed. A liquid crystal display device using such an optical compensator has a so-called colored structure in which light transmitted through a polarizer and a liquid crystal cell for display (generally having birefringence) becomes elliptically polarized light due to an optical rotation dispersion phenomenon and is colored. In order to reduce the phenomenon, a compensation liquid crystal cell with a twist direction opposite to the liquid crystal molecule twist direction of the display liquid crystal cell is newly provided, and the elliptically polarized light generated in the display liquid crystal cell is returned to the original linear polarized light, and the polarization is returned. And black display. In this case, the liquid crystal cell is manufactured under almost the same conditions except that the liquid crystal molecule twist direction is reversed, and the optical rotation dispersion phenomenon in the liquid crystal cell is compensated by the liquid crystal cell.
光学補償層としての液晶セルは良好な特性を有してい
るが、一般に、液晶パネル用のガラス基板は高価であ
り、又、液晶パネルの歩留りが悪く、これらにより、安
価に構成できない問題点があった。Although a liquid crystal cell as an optical compensation layer has good characteristics, generally, a glass substrate for a liquid crystal panel is expensive, and the yield of the liquid crystal panel is low. there were.
本発明は、光学補償層を低コストに構成できるカラー
液晶表示装置を提供することを目的とする。An object of the present invention is to provide a color liquid crystal display device in which an optical compensation layer can be configured at low cost.
第１図は本発明の原理図を示す。同図中、251,252,…
は少なくとも２色のカラーフィルタ、26は表示液晶層、
27は光学補償層である。本発明は、光学補償層27を屈折
率の異方性を有する透明フィルム281,282,…で構成し、
これをカラーフィルタ251,252,…の各色に対して夫々設
け、屈折率の異方性とフィルム厚との積を各色に対して
夫々異ならしめてなる。FIG. 1 shows a principle diagram of the present invention. In the figure, 25 1 , 25 2 , ...
Is a color filter of at least two colors, 26 is a display liquid crystal layer,
27 is an optical compensation layer. In the present invention, the optical compensation layer 27 is composed of transparent films 28 1 , 28 2 ,.
This is provided for each color of the color filters 25 1 , 25 2 ,..., And the product of the anisotropy of the refractive index and the film thickness is made different for each color.
各透明フィルム281,282,…の屈折率の異方性の大きさ
や方向を所定値に設定することにより、黒表示時、液晶
層26から取出された楕円偏光を略同一の直線偏光に変換
できる。つまり、補償用液晶層と同じ効果を得ることが
できる。By setting the magnitude and direction of the anisotropy of the refractive index of each of the transparent films 28 1 , 28 2 ,... To a predetermined value, the elliptically polarized light extracted from the liquid crystal layer 26 becomes substantially the same linearly polarized light during black display. Can be converted. That is, the same effect as that of the compensation liquid crystal layer can be obtained.
この場合、透明フィルムを用いているため、補償用液
晶パネルを用いていた従来例に比し、ガラス基板を用い
る必要はなく、又、液晶パネルに対して歩留りが良好で
あり、これらにより、安価に構成できる。In this case, since a transparent film is used, it is not necessary to use a glass substrate as compared with the conventional example using a liquid crystal panel for compensation, and the yield is good with respect to the liquid crystal panel. Can be configured.
第２図は本発明の一実施例の構成図を示す。同図中、
１は液晶パネルで、ガラス板２、Ｒ（赤）,G（緑）,B
（青）に夫々対応したカラーフィルタ3R,3G,3B、マトリ
クス状透明電極4a,4b、配向膜５、例えば260゜のツィス
トをもつSTN型の液晶６（セル厚は例えば６μｍ、屈折
率の異方性Δｎは例えば0.15）、シール材７、ガラス板
８にて構成されており、液晶パネル１そのものは従来の
ものと同じである。９はバックライト、10は偏光板であ
る。FIG. 2 shows a block diagram of one embodiment of the present invention. In the figure,
1 is a liquid crystal panel, a glass plate 2, R (red), G (green), B
(Blue) color filters 3 R , 3 G , 3 B , matrix transparent electrodes 4 a, 4 b, alignment film 5, STN type liquid crystal 6 having, for example, a 260 ° twist (cell thickness is, for example, 6 μm, refraction) The anisotropy Δn of the ratio is, for example, 0.15), a seal member 7 and a glass plate 8. The liquid crystal panel 1 itself is the same as the conventional one. 9 is a backlight and 10 is a polarizing plate.
11R,11G,11Bは透明シートで、例えばポリマの延伸フ
ィルムで構成されており、夫々、屈折率の異方性Δｎ
（Δｎ＝平行方向屈折率ｎ−垂直方向屈折率ｎ⊥）を
有しており、光学補償層を形成する。この場合、シート
11R,11G,11Bの延伸方向は液晶６中の偏光の回転方向と
逆方向にシート中の光が回転するように設定されてい
る。12は偏光板である。本発明は、光学補償層を液晶で
構成せず、屈折率の異方性を有する部材で構成した点に
特徴を有する。11 R , 11 G , and 11 B are transparent sheets, for example, made of a stretched polymer film, each having a refractive index anisotropy Δn.
(Δn = refractive index in the parallel direction n−refractive index in the vertical direction n⊥ ), and forms an optical compensation layer. In this case, the sheet
The stretching directions of 11 R , 11 G , and 11 B are set so that the light in the sheet rotates in the opposite direction to the rotation direction of the polarized light in the liquid crystal 6. 12 is a polarizing plate. The present invention is characterized in that the optical compensation layer is not formed of liquid crystal but is formed of a member having anisotropy in refractive index.
第３図は光学補償の様子を説明する図を示す。第３図
において、バックライトから出た白色光13は偏光板10を
通過して直線偏光14となり、次に、カラーフィルタ3R,3
G,3Bを通過してR,G,Bの３色の光15R,15G,15Bに分離され
る。FIG. 3 is a diagram for explaining the state of optical compensation. In FIG. 3, the white light 13 emitted from the backlight passes through the polarizing plate 10 to become linearly polarized light 14, and then the color filters 3 R , 3
Through the G, 3 B is separated into R, G, light 15 R, 15 G, 15 B 3 colors of B.
ここで、黒表示時、液晶６に両側の透明電極によって
比較的低電圧を印加する。これにより、液晶６の液晶分
子は変らず、液晶６には一般に複屈折率性があるので液
晶６を通過した光は各色に対して楕円偏光16R,16G,16B
となり、シート11R,11G,11Bを通過する。この場合、シ
ート11R,11G,11Bの各々の屈折率の異方性Δｎの大き
さ，Δｎの方向，シート厚ｄを楕円偏光16R,16G,16Bに
対して適切な値に設定すると、楕円偏光16R,16G,16Bは
略同一の直線偏光17R,17G,17Bとなる。直線偏光17R,1
7G,17Bは偏光板12を通過しないのて、楕円偏光16R,16G,
16Bによる不必要な着色を呈することを防止でき、黒表
示となる。Here, during black display, a relatively low voltage is applied to the liquid crystal 6 by the transparent electrodes on both sides. As a result, the liquid crystal molecules of the liquid crystal 6 do not change, and since the liquid crystal 6 generally has a birefringent property, light passing through the liquid crystal 6 emits elliptically polarized light 16 R , 16 G , 16 B for each color.
And passes through the sheets 11 R , 11 G and 11 B. In this case, the magnitude of the anisotropy Δn of the refractive index of each of the sheets 11 R , 11 G , and 11 B , the direction of Δn, and the sheet thickness d are set to appropriate values for the elliptically polarized lights 16 R , 16 G , and 16 B. , The elliptically polarized light 16 R , 16 G , 16 B becomes substantially the same linearly polarized light 17 R , 17 G , 17 B. Linear polarized light 17 R , 1
Since 7 G and 17 B do not pass through the polarizing plate 12, elliptically polarized light 16 R , 16 G ,
Unnecessary coloring due to 16 B can be prevented, and black display is achieved.
一方、色表示時、液晶６に両側の透明電極によって比
較的高電圧を印加する。これにより、液晶６の液晶分子
は立ち、液晶６を通過した光は各色に対して直線偏光18
R,18G,18Bとなり、シート11R,11G,11Bを通過する。この
場合、液晶６を通過した光は直線偏光18R,18G,18Bであ
るので、シート11R,11G,11Bを通過した光は前述の場合
とは逆に楕円偏光19R,19G,19Bとなる。楕円偏光19R,1
9G,19Bは偏光板12を通過することが可能であるので、夫
々R,G,Bを表示する。On the other hand, during color display, a relatively high voltage is applied to the liquid crystal 6 by the transparent electrodes on both sides. As a result, the liquid crystal molecules of the liquid crystal 6 rise, and the light that has passed through the liquid crystal 6 becomes linearly polarized light 18 for each color.
R, 18 G, 18 B, and the sheet 11 R, passes through a 11 G, 11 B. In this case, since the light passing through the liquid crystal 6 is linearly polarized light 18 R , 18 G , 18 B , the light passing through the sheets 11 R , 11 G , 11 B is elliptically polarized light 19 R , contrary to the above case. 19 G and 19 B. Elliptically polarized light 19 R , 1
Since 9 G and 19 B can pass through the polarizing plate 12, R, G and B are displayed, respectively.
ここで、シート11R,11G,11Bの補償作用について考え
てみる。シート11R,11G,11Bは、第４図に示す如く、屈
折率の異方性Δｎ（Δｎ＝平行方向屈折率ｎ−垂直方
向屈折率ｎ⊥）をΔnR,ΔnG,ΔnBのように夫々異にされ
ている。この場合、各色に対する屈折率の異方性ΔnR,
ΔnG,ΔnBを異ならせるには、各色に対してΔｎの大き
さのみ、Δｎの方向のみ（シート11R,11G,11B夫々の間
で例えば10゜）、或いはΔｎの大きさと方向との双方、
を夫々異ならせればよい。例えば一実施例として、シー
ト11R,11G,11Bのシート厚ｄを同一とした場合、ΔnR,Δ
nG,ΔnBの値を液晶６からの楕円偏光16R,16G,16Bを直線
偏光17R,17G,17Bに変換できるだけの値は設定し、屈折
率の異方性Δｎとシート厚ｄとの積、つまり、シート11
RのΔnR・ｄを0.5μｍ、シート11GのΔnG・ｄを0.6μ
ｍ、シート11GのΔnB・ｄを0.7μｍとする。Here, the compensation action of the sheets 11 R , 11 G , and 11 B will be considered. As shown in FIG. 4, the sheets 11 R , 11 G , and 11 B have a refractive index anisotropy Δn (Δn = parallel direction refractive index n−vertical direction refractive index n⊥ ) of Δn R , Δn G , Δn B. Each is different. In this case, the anisotropy of the refractive index for each color Δn R ,
[Delta] n G, in order different [Delta] n B, the magnitude of [Delta] n for each color only, only the direction of the [Delta] n (sheet 11 R, 11 G, 11 B between, for example, 10 ° each), or the magnitude and direction of the [Delta] n And both,
May be different from each other. For example, as one embodiment, when the sheet thickness d of the sheets 11 R , 11 G , and 11 B is the same, Δn R , Δ
The values of n G and Δn B that can convert the elliptically polarized light 16 R , 16 G and 16 B from the liquid crystal 6 into linearly polarized light 17 R , 17 G and 17 B are set. The product of the sheet thickness d and the sheet 11
0.5μm to R of [Delta] n R · d, the [Delta] n G · d of the seat 11 G a 0.6 micron
m, a [Delta] n B · d of the seat 11 G and 0.7 [mu] m.
このように、シート11R,11G,11Bに屈折率の異方性Δ
ｎを有する延伸フィルムを用いると、延伸フィルムは実
質的に補償用液晶セルと同様に光の偏光方向を回転させ
るので、補償用液晶セルと同様に光学補償を行なうこと
ができる。しかも各色に対して夫々Δｎ・ｄの値を異な
らせているため、黒表示時、各色に対する楕円偏光16R,
16G,16Bを正しく直線偏光17R,17G,17Bに変換でき、一
方、色表示時、各色に対する直線偏光18R,18G,18Bを正
しく楕円偏光19R,19G,19Bに変換でき、高品質のカラー
表示を行なうことができる。Thus, the sheets 11 R , 11 G , and 11 B have the refractive index anisotropy Δ
When a stretched film having n is used, the stretched film rotates the polarization direction of light substantially in the same manner as in the compensating liquid crystal cell, so that optical compensation can be performed in the same manner as in the compensating liquid crystal cell. Moreover, since the value of Δn · d is different for each color, the elliptically polarized light 16 R ,
16 G and 16 B can be correctly converted to linearly polarized light 17 R , 17 G and 17 B , while at the time of color display, linearly polarized light 18 R , 18 G and 18 B for each color can be correctly converted to elliptically polarized light 19 R , 19 G and 19 B. It can be converted to B , and high quality color display can be performed.
この場合、Δｎ・ｄを各色に対して異ならしめるに
は、上記のようにΔｎのみを各色に対して異ならせる
（ΔnR,ΔnG,ΔnBのようにする）他、Δｎは同一で、シ
ート厚ｄを各色に対して異ならせるようにしてもよく、
或いはΔｎ及びｄの双方を各色に対して異らせるように
してもよい。特に、シートは層状に構成することも可能
であり、各層シートのΔｎを夫々適切な値に設定するこ
とにより、前述と同様の効果を得ることができる。In this case, in order to make Δn · d different for each color, only Δn is made different for each color as described above (like Δn R , Δn G , Δn B ), and Δn is the same, The sheet thickness d may be made different for each color,
Alternatively, both Δn and d may be different for each color. In particular, the sheets can be formed in layers, and the same effect as described above can be obtained by setting Δn of each layer sheet to an appropriate value.
なお、上記実施例はR,G,の３色に適用したものである
が、これに限定されものではなく、これ以外の色の組合
わせでも２色以上であれは本発明を適用できる。Although the above embodiment is applied to three colors of R, G, and the like, the present invention is not limited to this, and the present invention can be applied to other combinations of two or more colors.
以上説明した如く、本発明によれば、光学補償層に透
明フィルムを用いたため、補償用液晶パネルを用いた従
来例に比して安価に構成でき、高品質のカラー表示を行
なうことができる。As described above, according to the present invention, since the transparent film is used for the optical compensation layer, it can be configured at a lower cost than the conventional example using the liquid crystal panel for compensation, and high quality color display can be performed.
第１図は本発明の原理図、 第２図は本発明の一実施例の構成図、 第３図は光学補償の様子を説明する図、 第４図はシートの屈折率の異方性を説明する図である。 図において、 １は液晶パネル、 3R,3G,3B,251,252,…はカラーフィルタ、 4a,4bは透明電極、 ６は液晶、 10,12は偏光板、 11R,11G,11Bは透明シート、 14は偏光板10を通過した直線偏光、 15R,15G,15Bはカラーフィルタを通過した直線偏光、 16R,16G,16Bは液晶を通過した楕円偏光、 17R,17G,17Bはシートを通過した直線偏光、 18R,18G,18Bは液晶を通過した直線偏光、 19R,19G,19Bはシートを通過した楕円偏光、 26は表示用液晶層、 27は光学補償層、 281,282,…は透明フィルム を示す。FIG. 1 is a diagram illustrating the principle of the present invention, FIG. 2 is a diagram illustrating the configuration of an embodiment of the present invention, FIG. 3 is a diagram illustrating the state of optical compensation, and FIG. FIG. In the figure, 1 is a liquid crystal panel, 3 R , 3 G , 3 B , 25 1 , 25 2 ,... Are color filters, 4 a and 4 b are transparent electrodes, 6 is liquid crystal, 10 and 12 are polarizing plates, 11 R and 11. G, 11 B is a transparent sheet, 14 is linearly polarized light that has passed through the polarizer 10, 15 R, 15 G, 15 B is linearly polarized light that has passed through the color filters, 16 R, 16 G, 16 B is passed through the liquid crystal oval polarization, 17 R, 17 G, 17 B is linearly polarized light that has passed through the sheet, 18 R, 18 G, 18 B are linearly polarized light passing through the liquid crystal, 19 R, 19 G, 19 B is elliptically polarized light that has passed through the sheet, 26 denotes a display liquid crystal layer, 27 denotes an optical compensation layer, and 28 1 , 28 2 ,...
Claims (4)
2,…）と、表示用液晶層（26）と、該表示用液晶層（2
6）の光学軸ツィスト方向と逆方向の光学軸ツィスト方
向をもつ光学補償層（27）とを重ね、該表示用液晶層
（26）で生じた着色を該光学補償層（27）で補償する構
成としたカラー液晶表示装置において、 上記光学補償層（27）を屈折率の異方性を有する透明フ
ィルム（281,282,…）で構成し、これを上記カラーフィ
ルタ（251,252,…）の各色に対して夫々設け、 屈折率の異方性とフィルム厚との積を該各色に対して夫
々異ならしめてなることを特徴とするカラー液晶表示装
置。A color filter of at least two colors (25 1 , 25
2 ,...), A display liquid crystal layer (26), and the display liquid crystal layer (2).
The optical compensation layer (27) having an optical axis twist direction opposite to the optical axis twist direction of 6) is overlapped, and the coloring generated in the display liquid crystal layer (26) is compensated by the optical compensation layer (27). In the color liquid crystal display device having the above structure, the optical compensation layer (27) is made of a transparent film (28 1 , 28 2 ,...) Having anisotropy of the refractive index, and this is formed by the color filter (25 1 , 25 2. ) A color liquid crystal display device provided for each of the colors, wherein the product of the anisotropy of the refractive index and the film thickness is made different for each of the colors.
の延伸フィルムであることを特徴とする請求項１記載の
カラー液晶表示装置。2. The color liquid crystal display device according to claim 1 , wherein said transparent films (28 1 , 28 2 ,...) Are stretched films of a polymer.
率の異方性の方向が該各色に対して異なることを特徴と
する請求項１記載のカラー液晶表示装置。3. The color liquid crystal display device according to claim 1 , wherein the transparent films (28 1 , 28 2 ,...) Have different directions of anisotropy of the refractive index for each color.
率の異方性の大きさが該各色に対して異なることを特徴
とする請求項１記載のカラー液晶表示装置。4. The color liquid crystal display device according to claim 1 , wherein the transparent films (28 1 , 28,...) Have different anisotropy of the refractive index for each color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170537A JP2706473B2 (en) | 1988-07-08 | 1988-07-08 | Color liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170537A JP2706473B2 (en) | 1988-07-08 | 1988-07-08 | Color liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0220825A JPH0220825A (en) | 1990-01-24 |
| JP2706473B2 true JP2706473B2 (en) | 1998-01-28 |
Family
ID=15906750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63170537A Expired - Lifetime JP2706473B2 (en) | 1988-07-08 | 1988-07-08 | Color liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2706473B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2897131B2 (en) * | 1989-06-06 | 1999-05-31 | 株式会社リコー | Liquid crystal display device |
| JP2004191832A (en) | 2002-12-13 | 2004-07-08 | Dainippon Printing Co Ltd | Optical retardation element, display element provided with the same, and production method of optical retardation element |
| JP2007163894A (en) | 2005-12-14 | 2007-06-28 | Fujifilm Corp | Liquid crystal display device |
| JP2008112110A (en) * | 2006-10-31 | 2008-05-15 | Optrex Corp | Liquid crystal display |
| JP4591622B2 (en) * | 2008-03-31 | 2010-12-01 | 凸版印刷株式会社 | Phase difference substrate, transflective liquid crystal display device, and method of manufacturing phase difference substrate |
-
1988
- 1988-07-08 JP JP63170537A patent/JP2706473B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0220825A (en) | 1990-01-24 |
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