JPH01238621A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH01238621A JPH01238621A JP63066233A JP6623388A JPH01238621A JP H01238621 A JPH01238621 A JP H01238621A JP 63066233 A JP63066233 A JP 63066233A JP 6623388 A JP6623388 A JP 6623388A JP H01238621 A JPH01238621 A JP H01238621A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- polarizing plate
- angle
- display device
- torsion
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 45
- 238000002834 transmittance Methods 0.000 claims abstract description 16
- 239000011521 glass Substances 0.000 claims abstract description 14
- 230000010287 polarization Effects 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 8
- 210000002858 crystal cell Anatomy 0.000 claims description 13
- 239000000463 material Substances 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 101150034533 ATIC gene Proteins 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
この発明は、マルチプレックス駆動に適し、６４０Ｘ４
００絵素や６４０Ｘ４８０絵素なとの大表示容量デイス
プレィパネルとしてパーソナルコンピュータやワートブ
ロセソサなどの情報機器端末に使用される液晶表示装置
に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field This invention is suitable for multiplex drive, and is suitable for 640
The present invention relates to a liquid crystal display device used in information equipment terminals such as personal computers and word processors as a large display capacity display panel with 00 pixels or 640×480 pixels.
（ロ）従来の技術
従来、液晶表示装置とくには大表示容量の液晶表示装置
において、表示の品位を上げるためにさまざまな提案が
なされている。その中で、Ｒｏ−ｃｈｅ社のＤｒ、５ｃ
ｈａｄｔが提案したＯＭＩ（Ｏｐｔｉｃａｌ Ｍｏｄ
ｅ Ｉｎｔｅｒ−ｆｅｒｅｎｃｅ）方式は、それまで
のＳＴＮ （Ｓｕｐｅｒ Ｔｗｉｓｔｅｄ Ｎｅｍ
ａｔｉｃ）液晶表示装置の背景色の着色現象（黄緑色）
を解消し、白黒表示を可能としている（Ａｐｐｌ。(B) Prior Art Conventionally, various proposals have been made to improve the display quality of liquid crystal display devices, particularly liquid crystal display devices with a large display capacity. Among them, Dr. 5c of Ro-che
OMI (Optical Mod) proposed by hadt
e Inter-ference) method is similar to the previous STN (Super Twisted Name) method.
atic) Coloring phenomenon of background color of liquid crystal display device (yellow-green)
This eliminates the problem and enables black and white display (Appl.
Ｐｈｙｓ、 Ｌｅｔ ｔ、 ５０ （５）、 ２
Ｆｅｂｒｕａｒｙ １９８７）。Phys, Let t, 50 (5), 2
February 1987).
（ハ）発明が解決しようとする課題
しかしながら、０ＩＶＩＩ方式の液晶表示装置は液晶の
屈折率異方性Δｎ（正常光の屈折率と異常光の屈折率と
の差）と液晶セルの厚みｄとの積△ｎ×ｄを０５５以下
に設定するために、明るさが不足する傾向にあり、バン
クライト照明を用いる透過型液晶表示、装置では実用化
の方向にるるか、反射型液晶表示装置では背景色が青み
がかつており表示面が暗いといった問題があった。(c) Problems to be Solved by the Invention However, in the 0IVII type liquid crystal display device, the refractive index anisotropy Δn (difference between the refractive index of normal light and the refractive index of extraordinary light) of the liquid crystal and the thickness d of the liquid crystal cell Since the product △n×d is set to 055 or less, brightness tends to be insufficient. Transmissive liquid crystal displays and devices using bank light illumination are on the verge of being put into practical use, while reflective liquid crystal display devices are becoming less bright. There was a problem that the background color used to be bluish and the display surface was dark.
この発明は上記の事情を考慮してなされたもので、充分
な明るさか確保てきるとともに背景色の着色を解消する
ことができる液晶表示装置を提供しようとするものであ
る。The present invention has been made in consideration of the above circumstances, and aims to provide a liquid crystal display device that can ensure sufficient brightness and eliminate background coloring.
（ニ）課題を解決するための手段
この発明は、スーパーツィステッドネマチック液晶が封
入された液晶セルとその液晶セルの両面にそれぞれ配設
される高偏光度偏光板と高透過率偏光板とからなり、ス
ーパーツィステッドネマチック液晶の屈折率異方性と液
晶セル内の液晶層の厚みとの積を０６〜０．７とし、か
つ液晶セルを形成する２枚のガラス基板にそれぞれ貼設
された配向膜上の配向軸のなす角度を２１０゛〜２６０
°とすることを特徴とする液晶表示装置を提供する。(d) Means for Solving the Problem This invention consists of a liquid crystal cell in which a super twisted nematic liquid crystal is sealed, and a high polarization degree polarizing plate and a high transmittance polarizing plate respectively disposed on both sides of the liquid crystal cell. The product of the refractive index anisotropy of the super twisted nematic liquid crystal and the thickness of the liquid crystal layer in the liquid crystal cell is 06 to 0.7, and the super twisted nematic liquid crystal is attached to two glass substrates forming the liquid crystal cell. The angle formed by the alignment axis on the alignment film is 210° to 260°.
Provided is a liquid crystal display device characterized by: °.
高偏光度偏光板としては偏光度か９３％〜９９９９％の
ヨウ素系の偏光板が、高透過率偏光板としては透過率が
４５％〜５５％の染料系の偏光板かそれぞれに千適であ
る。An iodine-based polarizing plate with a polarization degree of 93% to 9999% is suitable as a high polarization polarizing plate, and a dye-based polarizing plate with a transmittance of 45% to 55% is suitable as a high transmittance polarizing plate. be.
（ホ）作用
屈折率異方性と液晶層の厚みとの積を０６〜０．７とし
、かつ配向軸のなす角度（液晶層のねじれ角）を２１０
°〜２６０°とすることかＬ値（光量を示す値）を４０
以上となし、充分に明るい表示面を形成する。また高偏
光度偏光板は点灯色をより黒くし、高透過率偏光板は背
景色を白くする。(E) The product of the working refractive index anisotropy and the thickness of the liquid crystal layer is 06 to 0.7, and the angle formed by the alignment axis (twist angle of the liquid crystal layer) is 210.
° ~ 260 ° or L value (value indicating the amount of light) 40
By doing the above, a sufficiently bright display surface is formed. Further, a high degree of polarization polarizing plate makes the lighting color blacker, and a high transmittance polarizing plate makes the background color whiter.
（へ）実施例
以下この発明の実施例を図面にて詳述するが、この発明
は以下の実施例に限定されるしのではない。(F) EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following examples.
第１図はドツトマトリクス式の液晶表示装置の縦断面図
で、１．２はガラス基板で、シール材３を介して２枚が
貼り合わされている。ガラス基板１．２の内側表面には
それぞれたとえばＩＴＯ膜（透明導電膜）からなる透明
電極４．５が形成されており、それぞれの透明電極４．
５を被覆するようにそれぞれのガラス基板１．２にはラ
ビング処理された配向膜６，７が貼設されている。そし
てガラス基板１．１間の空間に液晶材料８が封入される
。液晶材料８としては、ねじれ配向された液晶分子のツ
イスト角が９０°よりも大きくなるスーパーツィステッ
ドネマチック液晶であるンクロヘキザン系のチッソ（株
）製５Ｐ４６０８（Δｎ＝０．１０５．Ｔｃ’＝８６°
Ｃ，７７−２２ＣＩ））を使用し、その液晶層の厚みを
６μｍにする。したかってこの実施例においては、屈折
率異方性Δｎと液晶層の厚みｄとの積ΔｎＸｄは０．６
３となる。透明電極４，５と配向膜６，７とが設けられ
たガラス基板１．２とスーパーツィステッドネマチック
液晶とで液晶セル９が構成される。FIG. 1 is a longitudinal sectional view of a dot matrix type liquid crystal display device, in which 1.2 is a glass substrate, two of which are bonded together with a sealing material 3 interposed therebetween. A transparent electrode 4.5 made of, for example, an ITO film (transparent conductive film) is formed on the inner surface of the glass substrate 1.2, respectively.
Rubbed alignment films 6 and 7 are attached to each glass substrate 1.2 so as to cover the glass substrates 5. A liquid crystal material 8 is then sealed in the space between the glass substrates 1.1. The liquid crystal material 8 is 5P4608 (Δn=0.105.Tc'=86°, manufactured by Chisso Corporation), which is a super twisted nematic liquid crystal in which the twist angle of twisted liquid crystal molecules is larger than 90°.
C, 77-22CI)), and the thickness of the liquid crystal layer is 6 μm. Therefore, in this example, the product ΔnXd of the refractive index anisotropy Δn and the thickness d of the liquid crystal layer is 0.6.
It becomes 3. A liquid crystal cell 9 is composed of a glass substrate 1.2 provided with transparent electrodes 4, 5 and alignment films 6, 7, and super twisted nematic liquid crystal.
１０は高偏光度偏光板で、偏光度が９９９９％のヨウ素
系の偏光板である王立電機（株）製のｔ、Ｌｃ２−９２
−１８８を使用し、ガラス基板ｌの外側表面に配設され
る。また１１は高透過率偏光板で、ガラス基板２の外側
表面に配設され、透過率が５０％のカヤポーラ製のＳ−
２１−１０（開発コート）か使用される。それぞれの偏
光板１０゜１１の偏光軸１０ａ、ｌｌａとそれぞれの配
向膜６．７上の配向軸（ラビング方向）６ａ、７ａとは
第２図に示す関係を有している。第２図において、αは
配向軸６ａと配向軸７ａとのなす角度すなわち液晶層の
ねじれ角度であり、この実施例においては２４０°であ
る。βは配向膜７の配向軸７ａと高透過率偏光板＋１の
偏光軸１１ａとのなす角度であり、この実施例において
は３０°である。さらにγはそれぞれの偏光板１０．１
１の偏光軸１０ａと偏光軸１１ａとのなす角度であり、
この実施例では８５°である。10 is a high degree of polarization polarizing plate, t, Lc2-92 manufactured by Royal Electric Co., Ltd., which is an iodine-based polarizing plate with a degree of polarization of 9999%.
-188 and is disposed on the outer surface of the glass substrate l. Further, reference numeral 11 denotes a high transmittance polarizing plate, which is disposed on the outer surface of the glass substrate 2 and has a transmittance of 50%.
21-10 (development coat) is used. The polarizing axes 10a, lla of the respective polarizing plates 10.degree. 11 and the alignment axes (rubbing directions) 6a, 7a on the respective alignment films 6.7 have the relationship shown in FIG. In FIG. 2, α is the angle formed by the alignment axis 6a and the alignment axis 7a, that is, the twist angle of the liquid crystal layer, and is 240° in this embodiment. β is the angle between the alignment axis 7a of the alignment film 7 and the polarization axis 11a of the high transmittance polarizing plate +1, and is 30° in this example. Furthermore, γ is each polarizing plate 10.1
1 is the angle between the polarization axis 10a and the polarization axis 11a,
In this example it is 85°.
以上の構成において、第３図に示すように、Ｌ値はΔｎ
Ｘｄか０．６０μｍ以上で４０以上となるので、ΔｎＸ
ｄを０６０〜０７０の範囲にて設定することにより明る
さと色調とがコントロールされ、よって表示に必要な充
分な明るさが得られた。ΔｎＸｄを０．６０〜０７０の
範囲に設定する理由は、第４図の色度図に示すように、
ΔｎＸｄは０６０より小さくても０７０より大きくても
白点（ｗｈｉｔｅ ｐｏｉｎし）より遠さかろためて
あり、同時に上述したように充分な明るさを得るための
Ｌ値を満足させるようにするためである。In the above configuration, as shown in FIG. 3, the L value is Δn
If Xd is 0.60μm or more, it will be 40 or more, so ΔnX
By setting d in the range of 060 to 070, the brightness and color tone were controlled, and therefore sufficient brightness necessary for display was obtained. The reason why ΔnXd is set in the range of 0.60 to 070 is as shown in the chromaticity diagram in Figure 4.
Whether ΔnXd is smaller than 060 or larger than 070, it is stored at a distance from the white point, and at the same time, as mentioned above, in order to satisfy the L value to obtain sufficient brightness. be.
第５図はこの実施例の液晶セル９の透過率特性を示す図
であり、第６図は高透過率偏光板ＩＩの透過率特性を示
す図である。したがってこれらの特性を組み合わせろこ
とによって、波長が４００〜７００ｎｍの可視領域でフ
ラットな特性が得られ、青みの少ない白色が得られた。FIG. 5 is a diagram showing the transmittance characteristics of the liquid crystal cell 9 of this example, and FIG. 6 is a diagram showing the transmittance characteristics of the high transmittance polarizing plate II. Therefore, by combining these characteristics, flat characteristics were obtained in the visible wavelength range of 400 to 700 nm, and a white color with less bluish tinge was obtained.
なお上記実施例においては、高透過率偏光板側に光源（
バンクライト）を配設して使用される透過型表示装置と
して説明したが、高透過率偏光板側に高反射率の反射板
を配設することによって、反射型表示装置としてもよい
。高反射率の反射板としては、その表面状態を粗にした
反射板か好ましく、たとえば日東電工（昧）製のＮＰＦ
’３２０５Ｍや王立電機（株）製のＬＬ４６１２ＷＮＡ
なとを使用すればよい。このように構成すれば、従来の
反射型表示装置に比べ明るい背景の白黒表示の液晶表示
装置か得られろ。In the above embodiment, a light source (
Although the present invention has been described as a transmissive display device that is used by disposing a bank light, it may also be used as a reflective display device by disposing a high-reflectance reflecting plate on the high-transmittance polarizing plate side. As a reflector with high reflectance, it is preferable to use a reflector with a rough surface, such as NPF manufactured by Nitto Denko (Madhi).
'3205M and LL4612WNA manufactured by Royal Electric Co., Ltd.
You can use nato. With this configuration, a liquid crystal display device with a black and white display with a brighter background than a conventional reflective display device can be obtained.
（ト）発明の効果
この発明によれば、背景色である白色と表示色である黒
色とのコントラストが向上し、表示画面が充分に明るい
液晶表示装置が得られる。(G) Effects of the Invention According to the present invention, the contrast between the white background color and the display color black is improved, and a liquid crystal display device with a sufficiently bright display screen can be obtained.
第１図はこの発明の実施例の縦断面図、第２図は実施例
におけるそれぞれの偏光軸と配向軸との関係を示す説明
図、第３図はΔｎＸｃｌとＬ値との関係を示すり８う乙
第４図はΔｎＸｄと色相との関係を示す色度図、第５図
は液晶セルの分光特性を示すグラフ、第６図は高透過率
偏光板の分光特性を示すグラフである。
１．２ ガラス基板、６．７ 配向膜、６ａ、７
ａ−配向軸、８ ・・液晶材料、９ ・液晶セル、１０
高偏光度偏光板、＋１ 高透過率偏光板。
００１””−FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the relationship between each polarization axis and orientation axis in the embodiment, and FIG. 3 is a diagram showing the relationship between ΔnXcl and L value. FIG. 4 is a chromaticity diagram showing the relationship between ΔnXd and hue, FIG. 5 is a graph showing the spectral characteristics of a liquid crystal cell, and FIG. 6 is a graph showing the spectral characteristics of a high transmittance polarizing plate. 1.2 Glass substrate, 6.7 Alignment film, 6a, 7
a-alignment axis, 8 ・Liquid crystal material, 9 ・Liquid crystal cell, 10
High polarization degree polarizing plate, +1 high transmittance polarizing plate. 001""-
Claims (1)
液晶セルとその液晶セルの両面にそれぞれ配設される高
偏光度偏光板と高透過率偏光板とからなり、スーパーツ
イステッドネマチック液晶の屈折率異方性と液晶セル内
の液晶層の厚みとの積を０．６〜０．７とし、かつ液晶
セルを形成する２枚のガラス基板にそれぞれ貼設された
配向膜上の配向軸のなす角度を２１０°〜２６０°とす
ることを特徴とする液晶表示装置。1. It consists of a liquid crystal cell filled with super twisted nematic liquid crystal, and a high polarization degree polarizing plate and a high transmittance polarizing plate arranged on both sides of the liquid crystal cell, and the refractive index anisotropy of super twisted nematic liquid crystal The product with the thickness of the liquid crystal layer in the liquid crystal cell is 0.6 to 0.7, and the angle formed by the alignment axes on the alignment films attached to the two glass substrates forming the liquid crystal cell is 210°. A liquid crystal display device characterized in that the angle is 260°.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63066233A JPH01238621A (en) | 1988-03-18 | 1988-03-18 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63066233A JPH01238621A (en) | 1988-03-18 | 1988-03-18 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01238621A true JPH01238621A (en) | 1989-09-22 |
Family
ID=13309932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63066233A Pending JPH01238621A (en) | 1988-03-18 | 1988-03-18 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01238621A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008102227A (en) * | 2006-10-18 | 2008-05-01 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
| JP2008158503A (en) * | 2006-12-22 | 2008-07-10 | Samsung Electronics Co Ltd | Liquid crystal display device |
| JP2009025780A (en) * | 2007-06-18 | 2009-02-05 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
| JP2009092847A (en) * | 2007-10-05 | 2009-04-30 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61210324A (en) * | 1985-03-15 | 1986-09-18 | Hitachi Ltd | Liquid crystal display element |
| JPS63274924A (en) * | 1987-05-07 | 1988-11-11 | Asahi Glass Co Ltd | Liquid crystal display element |
| JPS6442632A (en) * | 1987-08-10 | 1989-02-14 | Seiko Instr & Electronics | Liquid crystal device |
-
1988
- 1988-03-18 JP JP63066233A patent/JPH01238621A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61210324A (en) * | 1985-03-15 | 1986-09-18 | Hitachi Ltd | Liquid crystal display element |
| JPS63274924A (en) * | 1987-05-07 | 1988-11-11 | Asahi Glass Co Ltd | Liquid crystal display element |
| JPS6442632A (en) * | 1987-08-10 | 1989-02-14 | Seiko Instr & Electronics | Liquid crystal device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008102227A (en) * | 2006-10-18 | 2008-05-01 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
| JP2008158503A (en) * | 2006-12-22 | 2008-07-10 | Samsung Electronics Co Ltd | Liquid crystal display device |
| US8665400B2 (en) | 2006-12-22 | 2014-03-04 | Samsung Display Co., Ltd. | Display device |
| JP2009025780A (en) * | 2007-06-18 | 2009-02-05 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
| US8274624B2 (en) | 2007-06-18 | 2012-09-25 | Nitto Denko Corporation | Liquid crystal panel and liquid crystal display |
| JP2009092847A (en) * | 2007-10-05 | 2009-04-30 | Nitto Denko Corp | Liquid crystal panel and liquid crystal display device |
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