JPS613125A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPS613125A JPS613125A JP59123484A JP12348484A JPS613125A JP S613125 A JPS613125 A JP S613125A JP 59123484 A JP59123484 A JP 59123484A JP 12348484 A JP12348484 A JP 12348484A JP S613125 A JPS613125 A JP S613125A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- plate
- light
- display device
- 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
Classifications
-
- 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
- G02F1/133553—Reflecting elements
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、・少くとも一方が透過性を有する一対の電極
基板の間に液晶材料を封入した液晶セルと、これをはさ
むように配置された一対の偏光板によって構成された液
晶表示装置に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides: a liquid crystal cell in which a liquid crystal material is sealed between a pair of electrode substrates, at least one of which is transparent; The present invention relates to a liquid crystal display device configured with a pair of polarizing plates.
従来より、液晶表示装置は１低消費電力で小型な画像表
示器であるために、小型計算機や電子腕時計の表示器と
して幅広く用いられておシ、最近においては、フルカラ
ーの液晶表示装置も開発され小型カラーテレビジョンや
ビューファインダ、ハンディコンピュータなどの表示部
分に様々な用途への応用が考えられている。Traditionally, liquid crystal display devices have been widely used as displays in small computers and electronic wristwatches because they are small image displays with low power consumption.Recently, full-color liquid crystal display devices have also been developed. Various applications are being considered for the display parts of small color televisions, viewfinders, and handheld computers.
先ず、液晶表示装置の原理を、ＴＮ型の場合について、
第３図を参照して説明する。第３図において、１０は透
過性を有する一対の電極基板の間に液晶材料を封入して
成るＴＮ型液晶セル、１１は電圧源、１２はスイッチ、
１３および１４は液晶セルをはさむ↓うに配置された偏
光板を示す。First, we will explain the principle of a liquid crystal display device in the case of a TN type.
This will be explained with reference to FIG. In FIG. 3, 10 is a TN type liquid crystal cell formed by sealing a liquid crystal material between a pair of transparent electrode substrates, 11 is a voltage source, 12 is a switch,
Reference numerals 13 and 14 indicate polarizing plates placed on both sides of the liquid crystal cell.
入射光１５が偏光板１３に入射すると、偏光板１３上に
示した矢印１６の方向に偏光した直線偏波光のみが透過
される。偏光板工３を透過した光は、ＴＮ配列の液晶セ
ルＩＯＫ入射される。ＴＮ配列の液晶セルＩＯＫは、電
圧源１１およびスイ、チ１２を介して電圧印加が可能と
なっているが。When the incident light 15 enters the polarizing plate 13, only linearly polarized light polarized in the direction of the arrow 16 shown on the polarizing plate 13 is transmitted. The light transmitted through the polarizing plate 3 is incident on the TN array liquid crystal cell IOK. A voltage can be applied to the TN array liquid crystal cell IOK via the voltage source 11 and switches and switches 12.
電圧無印加時では直線偏波光はＴＮ配列セル１０を透過
中に液晶分子の捩れに沿って９０°だけ回転（９０°旋
光）する（図示矢印１６）。したがってＴＮセルからの
出射光１７は、矢印１６と同方向の偏光特性を持った偏
光板１４に入射するが偏光方向が９０°ずれているため
に透過することが出来ずＫこの部分のセルは暗く見える
。今、スイッチ１２をＯＮシてＴＮ配列セルＩＯＫ電圧
を印加するとＴＮセルの９０°の旋光性は消失してセル
１０の入射光と出射光の偏光方向は同じになり偏光板１
４を光は透過し明るく見える。When no voltage is applied, the linearly polarized light rotates by 90° (90° optical rotation) along the twist of the liquid crystal molecules while passing through the TN array cell 10 (arrow 16 in the figure). Therefore, the emitted light 17 from the TN cell enters the polarizing plate 14, which has polarization characteristics in the same direction as the arrow 16, but cannot be transmitted because the polarization direction is shifted by 90 degrees. It looks dark. Now, when the switch 12 is turned on and the TN array cell IOK voltage is applied, the 90° optical rotation of the TN cell disappears, and the polarization directions of the incident light and the output light of the cell 10 become the same, and the polarizing plate 1
Light passes through 4 and appears bright.
以上のような説明かられかるように液晶表示装置は１偏
光板を用いて光の透過や遮断を行なうために第４図に示
すように視野角θが限定され、視野角外やその付近にお
いて画像のコントラストが著しく低下してしまうという
欠点がある。As can be seen from the above explanation, the viewing angle θ is limited as shown in Figure 4 because the liquid crystal display uses one polarizing plate to transmit or block light. The disadvantage is that the contrast of the image is significantly reduced.
本発明は前述したように視野角が限定されるという欠点
を除去した液晶表示装置を提供することを目的とするも
のである。An object of the present invention is to provide a liquid crystal display device that eliminates the drawback of limited viewing angle as described above.
本発明による液晶表示装置は、少くとも一方が透過性を
有する一対の電極基板の間に液晶材料を封入した液晶セ
ルと、これをはさむように配置された一対の偏光板によ
って構成された液晶表示装置例おいて、一方の偏光板の
表面に光学的に拡散性をもつ部分を設けたことを特徴と
するものである。A liquid crystal display device according to the present invention includes a liquid crystal cell in which a liquid crystal material is sealed between a pair of electrode substrates, at least one of which is transparent, and a pair of polarizing plates arranged to sandwich the liquid crystal cell. The device example is characterized in that an optically diffusive portion is provided on the surface of one of the polarizing plates.
第１図は本発明に係る液晶表示装置の一実施例を示す。 FIG. 1 shows an embodiment of a liquid crystal display device according to the present invention.
図中２１は透過性を有する一対の電極基板の間に液晶材
料を封入した液晶セル、２２および２３は偏光板、２４
は偏光板２３の上に配置きれた拡散板を示す。拡散板２
４け透過形の拡散板で、その表面は微小な凹凸をもつ面
で形成されていて、透過してきた光の方向を無秩序の方
向に透過する。光源２５から来る光は偏光板２２を通っ
て液晶セル２１に入り、液晶セルによって明暗の光学的
変調を受は偏光板２３を通って拡散板２４に入る。拡散
板２４は、入って来た光を無秩序の方向に透過するので
、液晶表示装置の視野角は広がシ、従来のように視野角
外から表示装置を観察した場合のようなコントラスト不
足による表示部の認識不良は防止される。In the figure, 21 is a liquid crystal cell in which a liquid crystal material is sealed between a pair of transparent electrode substrates, 22 and 23 are polarizing plates, and 24
shows a diffuser plate disposed on the polarizing plate 23. Diffusion plate 2
It is a 4-piece transmission type diffuser plate, and its surface is formed with minute irregularities, so that the transmitted light is transmitted in random directions. Light coming from a light source 25 passes through a polarizing plate 22 and enters a liquid crystal cell 21, receives optical modulation of brightness and darkness by the liquid crystal cell, passes through a polarizing plate 23, and enters a diffusing plate 24. Since the diffuser plate 24 transmits the incoming light in random directions, the viewing angle of the liquid crystal display device is widened, and it is difficult to avoid the lack of contrast when observing the display device from outside the viewing angle as in the conventional case. Poor recognition of the display unit is prevented.
本発明は光源を必要とし７ない反射型の液晶表示装置に
用いても視野角を広げる効果はあるが、上記の実施例に
示したように透過型の液晶表示装置に用いた場合によシ
大きな効果を示す。Although the present invention has the effect of widening the viewing angle even when used in a reflective type liquid crystal display device that does not require a light source, the present invention has the effect of widening the viewing angle when used in a transmissive type liquid crystal display device as shown in the above embodiment. Shows great effect.
本発明に用いる拡散板としては、よく知らｔ］るものと
しては、磨ガラスなどがを）る。拡散板の表面粗さは１
視野角の広がりと、画像の解像度とのかねあいによって
決めるのがよい。A well-known example of the diffuser plate used in the present invention is polished glass. The surface roughness of the diffuser plate is 1
It is best to decide based on the balance between the wide viewing angle and the image resolution.
拡散板はなるべく表示部に近い方が画像のコントラスト
が大きくなるために磨りガラスの粗面力；表示部側に来
るようＶこ密着するのがよい。The contrast of the image will be greater if the diffuser plate is as close to the display section as possible, so it is best to have the surface roughness of the frosted glass closely attached to the display section side.
第２図は本発明の他の実施例を示すもので、第１図に示
す実施例の拡散板の代りにマイクロレンズアレイを設け
たものである。［ゾ中、３１は液晶セル、３２および３
３は偏光板、３４はマイクロレ／−／７ン” 、 、
；、、′／、Ｓ７／？” ’ｊ！ｆン、に１２ どぐｊ
、、１ 、／ ７’ズアレイはその中の個々のレンズ
において開口数の大きなものを用いるほど視野角を広げ
ることが出来る。FIG. 2 shows another embodiment of the present invention, in which a microlens array is provided in place of the diffuser plate of the embodiment shown in FIG. [In the middle, 31 is a liquid crystal cell, 32 and 3
3 is a polarizing plate, 34 is a microlen/-/7", ,
;,,'/,S7/? ” 'j!fn, ni12 dogj
, 1, /7' array can widen the viewing angle by using larger numerical apertures for the individual lenses therein.
またマイクロレンズアレイの代りＫ、ファイ・々−マッ
トを用いても同様の効果を得ることが出来る。Furthermore, the same effect can be obtained by using a K, phi-mat instead of a microlens array.
以上説明したように１本発明は、液晶表示装置の上部に
透過形の拡散板を密着して取り付けたという簡単な構造
で、これまでの液晶表示装置の限定された視野角を大き
く広げる効果をもつ。As explained above, the present invention has a simple structure in which a transmissive diffuser plate is closely attached to the top of a liquid crystal display device, and has the effect of greatly expanding the limited viewing angle of conventional liquid crystal display devices. Motsu.
また現時点での液晶表示を用いたテレビ受像器は、画素
が粗いために画質が悪く見えるが、本発明をこのよう々
表示装置として用いると、本発明に用いる拡散板は、光
学的低域通過フィルタでもあるために１画素のあらさを
目立たなくするという効果があり、見かけ上面質が向上
するというメリットも得られる。特に最近発表されてい
るカラーフィルタを用いた液晶カラーテレビは、カラー
フィルタのストライブが目立ちがちであ多本発明をこの
ような表示器に用いるとカラーフィルタのストライプを
目立たなくシ、見かけ上の画質を向上させる。In addition, current television receivers using liquid crystal displays have coarse pixels and thus appear to have poor image quality. However, when the present invention is used as a display device in this way, the diffuser plate used in the present invention has an optical low-pass Since it is also a filter, it has the effect of making the imperfections of a single pixel less noticeable, and also has the advantage of improving the apparent surface quality. In particular, in LCD color TVs that use color filters that have been announced recently, the stripes on the color filter tend to be noticeable.If the present invention is applied to such a display, the stripes on the color filter will not be noticeable and the appearance will be reduced. Improve image quality.
第１図は本発明による液晶表示装置の一実施例を示す斜
視図、第２図は本発明の他の実施例を示す斜視図、第３
図は液晶表示装置の原理図、第４図は液晶表示装置の視
野角を示す図である。
１０・・・液晶セル １１・・・電圧源１２・・・
スイッチ １３．１４・・・偏光板１５・・・入射
光 １７・・・出射光２１・・・液晶セル
２２．２３・・・偏光板２４・・・拡散板 ２５
・・・光源３１・・・液晶セル ３２．３３・・・
偏光板３４・・・マイクロレンズアレイ
３５・・・光源
第１図
第２図FIG. 1 is a perspective view showing one embodiment of a liquid crystal display device according to the present invention, FIG. 2 is a perspective view showing another embodiment of the present invention, and FIG.
The figure is a diagram showing the principle of a liquid crystal display device, and FIG. 4 is a diagram showing the viewing angle of the liquid crystal display device. 10...Liquid crystal cell 11...Voltage source 12...
Switch 13.14...Polarizing plate 15...Incoming light 17...Outgoing light 21...Liquid crystal cell
22.23...Polarizing plate 24...Diffusion plate 25
...Light source 31...Liquid crystal cell 32.33...
Polarizing plate 34... Microlens array 35... Light source Figure 1 Figure 2
Claims (1)
晶材料を封入した液晶セルと、これをはさむように配置
された一対の偏光板によって構成された液晶表示装置に
おいて、一方の偏光板の表面に光学的に拡散性をもつ部
分を設けたことを特徴とする液晶表示装置。In a liquid crystal display device configured with a liquid crystal cell in which a liquid crystal material is sealed between a pair of electrode substrates, at least one of which is transparent, and a pair of polarizing plates arranged to sandwich the cell, one of the polarizing plates is A liquid crystal display device characterized by having an optically diffusive portion on its surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59123484A JPS613125A (en) | 1984-06-15 | 1984-06-15 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59123484A JPS613125A (en) | 1984-06-15 | 1984-06-15 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS613125A true JPS613125A (en) | 1986-01-09 |
Family
ID=14861770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59123484A Pending JPS613125A (en) | 1984-06-15 | 1984-06-15 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS613125A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5159478A (en) * | 1988-07-28 | 1992-10-27 | Kabushiki Kaisha Toshiba | Transmission liquid crystal display apparatus |
| JPH05203979A (en) * | 1992-01-28 | 1993-08-13 | Sharp Corp | Liquid crystal display device |
-
1984
- 1984-06-15 JP JP59123484A patent/JPS613125A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5159478A (en) * | 1988-07-28 | 1992-10-27 | Kabushiki Kaisha Toshiba | Transmission liquid crystal display apparatus |
| JPH05203979A (en) * | 1992-01-28 | 1993-08-13 | Sharp Corp | Liquid crystal display device |
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