JPS5911882B2 - LCD color display device - Google Patents
LCD color display deviceInfo
- Publication number
- JPS5911882B2 JPS5911882B2 JP51116348A JP11634876A JPS5911882B2 JP S5911882 B2 JPS5911882 B2 JP S5911882B2 JP 51116348 A JP51116348 A JP 51116348A JP 11634876 A JP11634876 A JP 11634876A JP S5911882 B2 JPS5911882 B2 JP S5911882B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- cholesteric liquid
- light
- 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.)
- Expired
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
-
- 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
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- 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)
- Liquid Crystal (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】
本発明は多色表示のできる液晶カラー表示装置に係わる
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal color display device capable of displaying multiple colors.
液晶を用いた表示装置は、低消費電力、低電圧駆動、安
価等の長所を有し、一部の表示機器に実用されている。Display devices using liquid crystals have advantages such as low power consumption, low voltage drive, and low cost, and are used in some display devices.
しかし、従来の液晶表示装置は全て白黒あるいは限定さ
れた２色表示であつた。その理由は、液晶は原理的には
多色表示が可能な電気光学効果も有しているが、それら
のほとんどが、表示色に視角依存性があり実用的視野が
非常に狭い、あるいは表示色の液晶層厚依存性が非常に
大であるため液晶パネルに極端な高精度が要求される等
の非実用的な欠点を有している所にあつた。本発明の目
的は、上記した従来における液晶表示の欠点を改善した
、即ち視野の広い多色表示が可能で実用的な液晶カラー
表示装置を提供することにある。本発明による液晶カラ
ー表示装置の構造上の基本的要旨とするところは、大別
して二種類ある。However, all conventional liquid crystal display devices display black and white or limited two colors. The reason for this is that, although liquid crystals also have an electro-optical effect that can, in principle, display multiple colors, in most cases, the displayed colors are dependent on the viewing angle, resulting in a very narrow practical field of view, or The dependence of the liquid crystal layer on the thickness of the liquid crystal layer is extremely large, so the liquid crystal panel has impractical drawbacks such as requiring extremely high precision. SUMMARY OF THE INVENTION An object of the present invention is to provide a practical liquid crystal color display device that improves the above-mentioned drawbacks of conventional liquid crystal displays, that is, is capable of displaying multiple colors with a wide field of view. The basic structural aspects of the liquid crystal color display device according to the present invention can be roughly divided into two types.
その一つは、表示にカラー効果を与えるための電界によ
る光波長選択散乱効果を示すコレステリツク液晶パネル
と、パターン表示を形成するための一対の直線偏光板で
挾まれた垂直配向ＤＳＭ効果型液晶パネルと、光の進路
方向を限定するための光学部材とから構成される新規な
構造である。もう一つは、表示にカラー効果を与えるた
めの電界による光波長選択散乱効果を示すコレステリツ
ク液晶パネルと、パターン表示を形成するための一対の
直線偏光板で挾まれたＴＮ型液晶パネルと、光の進路方
向を限定するための光学部材および光散乱光学部材とか
ら構成される新規な構造である。次に、本発明について
、実施例と示す図を参照しつつ、さらに詳しく説明する
。まず、本発明に用いる液晶パネルについて簡単に説明
する。One is a cholesteric liquid crystal panel that exhibits a light wavelength selective scattering effect using an electric field to give a color effect to the display, and a vertically aligned DSM effect liquid crystal panel that is sandwiched between a pair of linear polarizing plates to form a pattern display. This is a novel structure consisting of an optical member and an optical member for limiting the traveling direction of the light. The other is a cholesteric liquid crystal panel that exhibits a light wavelength-selective scattering effect using an electric field to give a color effect to the display, a TN liquid crystal panel sandwiched between a pair of linear polarizing plates to form a pattern display, and a This is a novel structure composed of an optical member for limiting the traveling direction of the light and a light scattering optical member. Next, the present invention will be described in more detail with reference to examples and figures shown. First, the liquid crystal panel used in the present invention will be briefly explained.
適当なラセンピツチを有するコレステリツク液晶は、そ
のフオーカルコニツク状と呼ばれる分子配向状態におい
て、可視光の波長選択散乱効果を示し、その光波長ある
いは散乱角が印加電界に応じて変化することは既によく
知られている。従つて、このようなコレステリツク液晶
パネルだけでは、表示色の視角依存性が強く、これを他
の光学部材で矯正すると表示視野が著しく狭くなつてし
まう。一方、ＤＳＭ（動的光散乱効果）型液晶パネルは
、電界非印加時は透明であり、電界が印加されると光を
散乱し、この光散乱は一般に波長依存性を持たず、視角
依存性もあまり無い。従つて、ＤＳＭ型液晶パネルは、
表示色は入射光色に限定されるが、表示視野は広いとい
う特徴を有する。なお、ＤＳＭ液晶パネルは、一般に電
界非印加時の液晶分子長軸の配向がパネル基板に垂直な
垂直配向型と、パネル基板に平行な平行配向型の二種類
があるが、本発明では垂直配向型を用いる。また、ＴＮ
（ねじれネマチツク）型液晶パネルは、電界非印加時の
液晶分子配向は９０晶ねじれ配向、電界印加時は垂直配
向を示すものである。従つて、ＴＮ型液晶パネルは、そ
の両側に一対の直線偏光板を設置すれば、電界印加によ
る光の透過・遡析制御効果に基ずく表示を行うことがで
きる。このＴＮ型液晶表示は、現在でも既に腕時計のデ
ジタル時刻表示等に用いられているが、視角によつては
表示コントラストは大きいが、その有効視野は狭い。本
発明は、上記した従来からある液晶パネルを他の光学部
材と共に組合わせて、有効視野の広い多色表示を可能に
するものである。次に、本発明による第１の実施例につ
いて説明する。第１図は第１の実施例の液晶カラー表示
装置の構造を示す断面図である。第１図における表示装
置は、コレステリツク液晶パネル１と垂直配向ＤＳＭ型
液晶パネル２が図示されているように互いにほぼ平行に
配置され、コレステリツク液晶パネル１の両側には、白
色光源３からの光のパネル１への入射角を適当なほぼ一
定の角度にするためのルーバ一４と、パネル１からの前
方散乱光のうちパネル面にほぼ垂直な散乱光のみを透過
させるためのルーバ一５とが設置され、一方ＤＳＭ型液
晶パネル２の両側には、偏光方向が互いに垂直な一対の
直線偏光板６，７が設置されている。前記コレステリツ
ク液晶パネル１およびＤＳＭ型液晶パネル２は、図示は
していないが各々適当な駆動回路に接続されている。ル
ーバ一４，５は、適当な厚みの不透明な板に、板面に対
し斜目もしくは垂直な方向の適当な口径の多数の孔を設
けたものでもよいし、通常の一次元方向のみの２枚のル
ーバ一を互いの方向を異なるように適当に合せ重ねるこ
とによつて所望の光進行角を得るようにしたものでもよ
い。コレステリツク液晶パネル１は、通常の数種類のコ
レステリツク液晶あるいはコレステリツク液晶とネマチ
ツク液晶とを混合した正の誘電異方性と可視光で前述し
た光波長選択散乱を示すような適当な大きさのラセンピ
ツチを有するコレステリツク液晶を使用し、この液晶に
電界を印加するための電極は用途に応じ適当な形状のも
のを使用する。また、ＤＳＭ型液晶パネル２は通常のも
のでよい。次に土述した構造の液晶カラー表示装置の動
作について説明する。It is already well known that cholesteric liquid crystals with a suitable helical pitch exhibit wavelength-selective scattering effects for visible light in a molecular orientation state called focalconic, and that the wavelength or scattering angle of the light changes depending on the applied electric field. It is being Therefore, if such a cholesteric liquid crystal panel is used alone, the display color has a strong viewing angle dependence, and if this is corrected with other optical members, the display field of view will be significantly narrowed. On the other hand, a DSM (dynamic light scattering effect) type liquid crystal panel is transparent when no electric field is applied, and scatters light when an electric field is applied, and this light scattering generally has no wavelength dependence but a viewing angle dependence. There aren't many either. Therefore, the DSM type liquid crystal panel is
The display color is limited to the color of the incident light, but the display field is wide. Note that there are generally two types of DSM liquid crystal panels: a vertical alignment type in which the long axis of the liquid crystal molecules is aligned perpendicular to the panel substrate when no electric field is applied, and a parallel alignment type in which the alignment is parallel to the panel substrate. Use a mold. Also, TN
In a (twisted nematic) type liquid crystal panel, liquid crystal molecules exhibit a 90-crystal twisted orientation when no electric field is applied, and a vertical orientation when an electric field is applied. Therefore, by installing a pair of linear polarizing plates on both sides of the TN type liquid crystal panel, display can be performed based on the light transmission/retrospection control effect by applying an electric field. This TN type liquid crystal display is already used for digital time displays in wristwatches, etc., and although the display contrast is large depending on the viewing angle, its effective field of view is narrow. The present invention enables multicolor display with a wide effective field of view by combining the conventional liquid crystal panel described above with other optical members. Next, a first embodiment of the present invention will be described. FIG. 1 is a sectional view showing the structure of a liquid crystal color display device according to a first embodiment. In the display device shown in FIG. 1, a cholesteric liquid crystal panel 1 and a vertically aligned DSM type liquid crystal panel 2 are arranged substantially parallel to each other as shown, and light from a white light source 3 is provided on both sides of the cholesteric liquid crystal panel 1. A louver 14 is provided to make the angle of incidence on the panel 1 a suitable approximately constant angle, and a louver 5 is provided to transmit only scattered light substantially perpendicular to the panel surface out of the forward scattered light from the panel 1. On the other hand, a pair of linear polarizing plates 6 and 7 whose polarization directions are perpendicular to each other are installed on both sides of the DSM type liquid crystal panel 2. The cholesteric liquid crystal panel 1 and the DSM type liquid crystal panel 2 are each connected to a suitable drive circuit, although not shown. The louvers 4 and 5 may be made of an opaque plate of an appropriate thickness with a large number of holes of appropriate diameter diagonally or perpendicular to the plate surface, or they may be made of two holes of an appropriate diameter in a direction diagonal or perpendicular to the plate surface, or two holes of an appropriate diameter in a normal one-dimensional direction. A desired light traveling angle may be obtained by appropriately stacking two louvers so that their directions are different from each other. The cholesteric liquid crystal panel 1 has positive dielectric anisotropy made of several types of ordinary cholesteric liquid crystals or a mixture of cholesteric liquid crystals and nematic liquid crystals, and a helical pitch of an appropriate size that exhibits the above-mentioned light wavelength selective scattering in visible light. A cholesteric liquid crystal is used, and the electrodes for applying an electric field to the liquid crystal are of an appropriate shape depending on the purpose. Further, the DSM type liquid crystal panel 2 may be a normal one. Next, the operation of the liquid crystal color display device having the structure described above will be explained.
まず、光源３からの白色光は、ルーバ一４により、定め
られた入射角でコレステリツク液晶パネル１へ入射する
。このコレステリツク液晶パネル１で散乱された光のう
ちパネル面に垂直な散乱光のみがルーバ一５を通過する
が、この垂直散乱光は前述したように液晶パネル１の印
加電界の大きさに応じて特定の波長すなわち特定の色を
有するものである。この特定の色の光は直線偏光板６に
より直線偏光となつて、次のＤＳＭ型液晶パネル２およ
び直線偏光板７に垂直に入射される。このＤＳＭ型液晶
パネル２は、垂直配向型であるため電界非印加部を透過
する光は直線偏光板７で遮断される。一方液晶パネル２
の電界印加部では、入射光はいわゆる動的光散乱効果に
よつて散乱され、この散乱光の大半は直線偏光板７を通
過して観視者８の目に入る。この時の表示色は観視者８
の視角に依らず一定である。表示面の表示色を変える場
合は、コレステリツク液晶パネル１の所望の部分の印加
電圧の大きさを適当に変えればよく、表示パターンを変
える場合はＤＳＭ型液晶パネル２の電圧印加を適当に変
えればよい。また、本表示装置の表示目的によって屯液
晶パネル１および２を、Ｘ−Ｙマトリクス電極構造等の
時分割駆動にすることも可能である。また、前記コレス
テリツク液晶パネル１の散乱光波長の液晶層厚依存性は
、散乱光波長の電界依存性がそれほど強くはないように
コレステリツク液晶の誘電率を小さくすることによつて
、小さく抑えることができる。すなわち、コレステリツ
ク液晶パネル１は、その寸法精度において通常程度でよ
く、充分実用的であるといえる。以上、要するに本実施
例による表示装置＆叙有効視野が広く、任意の表示色お
よび表示パターンが得られ、価格的にも充分実用的であ
る。次に、第２の実施例について説明する。First, white light from the light source 3 is incident on the cholesteric liquid crystal panel 1 through the louver 14 at a predetermined angle of incidence. Of the light scattered by the cholesteric liquid crystal panel 1, only the scattered light perpendicular to the panel surface passes through the louver 15, but as described above, this perpendicular scattered light depends on the magnitude of the electric field applied to the liquid crystal panel 1. It has a specific wavelength, that is, a specific color. This specific color light is converted into linearly polarized light by the linearly polarizing plate 6 and is perpendicularly incident on the next DSM type liquid crystal panel 2 and the linearly polarizing plate 7. Since this DSM type liquid crystal panel 2 is of a vertical alignment type, the light that passes through the non-electric field application area is blocked by the linear polarizing plate 7. On the other hand, LCD panel 2
In the electric field application section, the incident light is scattered by a so-called dynamic light scattering effect, and most of this scattered light passes through the linear polarizing plate 7 and enters the viewer's 8 eyes. The display color at this time is viewer 8
It is constant regardless of the viewing angle. If you want to change the display color on the display surface, just change the magnitude of the voltage applied to the desired part of the cholesteric liquid crystal panel 1, and if you want to change the display pattern, just change the voltage applied to the DSM type liquid crystal panel 2. good. Further, depending on the display purpose of the present display device, the liquid crystal panels 1 and 2 may be driven in a time-division manner using an X-Y matrix electrode structure or the like. Further, the dependence of the scattered light wavelength on the liquid crystal layer thickness of the cholesteric liquid crystal panel 1 can be suppressed by reducing the dielectric constant of the cholesteric liquid crystal so that the electric field dependence of the scattered light wavelength is not so strong. can. That is, the cholesteric liquid crystal panel 1 can be said to have a normal level of dimensional accuracy and is sufficiently practical. In short, the display device and display according to this embodiment has a wide effective field of view, allows arbitrary display colors and display patterns, and is sufficiently practical in terms of price. Next, a second example will be described.
第２図は、第２の実施例による液晶カラー表示装置の構
造を示す断面略図である。第２図における表示装置は、
コレステリツク液晶パネル９とＴＮ型液晶パネル１０が
図示されている様に互いにほぼ平行に配置され、コレス
テリツク液晶パネル９の両側には、白色光源１１からの
光のパネル９への入射角を適当なほぼ一定の角度にする
ためのルーバ一１２と、パネル９からの前方散乱光のう
ちパネル面にほぼ垂直な散乱光のみを透過させるための
ルーバ一１３が設置され、一方ＴＮ型液晶パネル１０の
両側には、偏光方向が互いに垂直もしくは平行な一対の
直線偏光板１４，１５が設置され、外側の直線偏光板１
５のさらに外側には光散乱板１６が配置された構成にあ
る。FIG. 2 is a schematic cross-sectional view showing the structure of a liquid crystal color display device according to a second embodiment. The display device in FIG.
A cholesteric liquid crystal panel 9 and a TN type liquid crystal panel 10 are arranged substantially parallel to each other as shown in the figure, and on both sides of the cholesteric liquid crystal panel 9, there are provided an appropriate angle of incidence of light from a white light source 11 to the panel 9. A louver 12 is installed to maintain a constant angle, and a louver 13 is installed to transmit only the scattered light that is substantially perpendicular to the panel surface out of the forward scattered light from the panel 9. A pair of linear polarizing plates 14 and 15 whose polarization directions are perpendicular or parallel to each other are installed, and the outer linear polarizing plate 1
A light scattering plate 16 is arranged further outside of the light scattering plate 5 .
前記コレステリツク液晶パネル９とＴＮ型液晶パネル１
０は、図示されてはいないが各々適当な駆動回路に接続
されている。ルーバ一１２，１３、コレステリツク液晶
パネル９、直線偏光板１４，１５＆ζ第１の実施例と同
様なものを同様に使用するので詳細ぱ省略する。ＴＮ型
液晶パネル１０は、通常のものでよい。光散乱板１６は
スリガラスあるいは薄紙の如き光を前方散乱するもので
ある。次に、上述した構造の液晶カラー表示装置の動作
について説明する。The cholesteric liquid crystal panel 9 and the TN type liquid crystal panel 1
0 are each connected to a suitable drive circuit, although not shown. Louvers 12, 13, cholesteric liquid crystal panel 9, linear polarizing plates 14, 15 &ζ are used in the same manner as in the first embodiment, so detailed description thereof will be omitted. The TN type liquid crystal panel 10 may be a normal one. The light scattering plate 16 is made of ground glass or thin paper that scatters light forward. Next, the operation of the liquid crystal color display device having the above structure will be explained.
光源１１からの光は、第１の実施例と同様にコレステリ
ツク液晶パネル９に印加される電界の大きさに応じた特
定色の直線偏光となつて、ＴＮ型液晶パネル１０に垂直
に入射される。このＴＮ型液晶パネル１０を透過する光
は、通常のＴＮ型液晶表示と同様に印加電界の大きさに
応じて次の直線偏光板１５を透過したり遮断されたりす
る。しかし、この透過光はパネル面に対して垂直な直進
光であるため、観視者１７が表示面を直正面から見る場
合以外は表示コントラストが著しく低いものとなる。光
散乱板１６は、このような表示視野の狭まさを改善する
ためのもので、前述したような垂直直進光を観視者１７
の方へ広く散乱させる役目を果す。表示色および表示パ
ターンの制御は、第１の実施例と同様に、液晶パネル９
，１０に印加する電圧を適当に加減することによつて行
〉ことができる。以上、要するに本実施例による表示装
置も、有効視野が広く任意の表示色および表示パターン
が得られ、価格的にも実用的である。なお、第１および
第２実施例における表示装置の各構成部材は、図では説
明をわかり易くするため互いに離して示されているが、
実際の装置ではなるべく互いに密着させる方がよい。ま
た、第２の実施例において、光散乱板１６はルーバ一１
３からある程度離れているために、表示パターンが細か
い場合等に表示パターンエツヂのぼけが目立つこともあ
る。As in the first embodiment, the light from the light source 11 becomes linearly polarized light of a specific color depending on the magnitude of the electric field applied to the cholesteric liquid crystal panel 9, and enters the TN type liquid crystal panel 10 perpendicularly. . The light transmitted through this TN type liquid crystal panel 10 is transmitted or blocked by the next linear polarizing plate 15 depending on the magnitude of the applied electric field, as in a normal TN type liquid crystal display. However, since this transmitted light travels in a straight line perpendicular to the panel surface, the display contrast becomes extremely low unless the viewer 17 views the display surface directly in front. The light scattering plate 16 is intended to improve the narrowness of the display field of view, and is designed to prevent the viewer 17 from directing the vertically traveling light as described above.
It plays the role of scattering it widely towards. The display colors and display patterns are controlled by the liquid crystal panel 9 as in the first embodiment.
, 10 by appropriately adjusting the voltages applied to them. In summary, the display device according to this embodiment also has a wide effective field of view, can provide arbitrary display colors and display patterns, and is also practical in terms of price. Note that although the constituent members of the display device in the first and second embodiments are shown separated from each other in the drawings to make the explanation easier to understand,
In an actual device, it is better to make them as close to each other as possible. In addition, in the second embodiment, the light scattering plate 16 is attached to the louver 11.
3, the blurring of the display pattern edge may become noticeable when the display pattern is fine.
従つて、視野は狭くてもシヤープな表示を得たい場合に
は、光散乱板１６は用いない方がよい場合もある。Therefore, if you want to obtain a sharp display even if the field of view is narrow, it may be better not to use the light scattering plate 16.
第１図は本発明による第１の実施例を示す断面略図であ
り、第２図は本発明による第２の実施例を示す断面略図
である。
図において、１，９・・・・・・コレステリツク液晶パ
ネル、２・・・・・・ＤＳＭ型液晶パネル、４，５，１
２，１３・・・・・・ルーバ一、６，７，１４，１５・
・・・・・直線偏光板、１０・・・・・・ＴＮ型液晶パ
ネル、１６・・・・・・光散乱板。FIG. 1 is a schematic cross-sectional view showing a first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing a second embodiment of the present invention. In the figure, 1, 9... cholesteric liquid crystal panel, 2... DSM type liquid crystal panel, 4, 5, 1
2, 13...louver one, 6, 7, 14, 15...
...Linear polarizing plate, 10 ...TN type liquid crystal panel, 16 ... Light scattering plate.
Claims (1)
ネルと垂直配向ＤＳＭ型液晶パネルとを含み、前記コレ
ステリツク液晶パネルの外側には光入射角を前記コレス
テリツク液晶パネル全面においてほぼ一定にするための
ルーバーをおよび内側には前記コレステリツク液晶パネ
ル面にほぼ垂直な光だけを透過させるためのルーバーを
配置し、前記垂直配向ＤＳＭ型液晶パネルの両側には互
いの偏光方向がほぼ垂直な一対の直線偏光板を配置した
ことを特徴とする液晶カラー表示装置。 ２ 互いにほぼ平行に配置されたコレステリツク液晶パ
ネルとＴＮ型液晶パネルとを含み、前記コレステリツク
液晶パネルの外側には光入射角を前記コレステリツク液
晶パネル全面においてほぼ一定にするためのルーバーを
、および内側には前記コレステリツク液晶パネル面にほ
ぼ垂直な光だけを透過させるためのルーバーを配置し、
前記ＴＮ型液晶パネルの両側には互いの偏光方向がほぼ
垂直もしくは平行な一対の直線偏光板を配置し、前記直
線偏光板のうち外側の直線偏光板のさらに外側に光散乱
板を配置したことを特徴とする液晶カラー表示装置。[Scope of Claims] 1. A cholesteric liquid crystal panel and a vertically aligned DSM type liquid crystal panel are arranged substantially parallel to each other, and on the outside of the cholesteric liquid crystal panel, the incident angle of light is made substantially constant over the entire surface of the cholesteric liquid crystal panel. A louver is arranged inside the cholesteric liquid crystal panel to transmit only light that is substantially perpendicular to the surface of the cholesteric liquid crystal panel, and a pair of louvers whose polarization directions are substantially perpendicular to each other are arranged on both sides of the vertically aligned DSM liquid crystal panel. A liquid crystal color display device characterized by arranging a linear polarizing plate. 2. It includes a cholesteric liquid crystal panel and a TN type liquid crystal panel arranged almost parallel to each other, and a louver is provided on the outside of the cholesteric liquid crystal panel to make the angle of light incidence almost constant over the entire surface of the cholesteric liquid crystal panel, and a louver is provided on the inside of the cholesteric liquid crystal panel. A louver is arranged to transmit only light almost perpendicular to the cholesteric liquid crystal panel surface,
A pair of linear polarizing plates whose polarization directions are substantially perpendicular or parallel to each other are arranged on both sides of the TN type liquid crystal panel, and a light scattering plate is arranged further outside of the outer linear polarizing plate among the linear polarizing plates. A liquid crystal color display device featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51116348A JPS5911882B2 (en) | 1976-09-28 | 1976-09-28 | LCD color display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51116348A JPS5911882B2 (en) | 1976-09-28 | 1976-09-28 | LCD color display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5342054A JPS5342054A (en) | 1978-04-17 |
| JPS5911882B2 true JPS5911882B2 (en) | 1984-03-19 |
Family
ID=14684718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51116348A Expired JPS5911882B2 (en) | 1976-09-28 | 1976-09-28 | LCD color display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5911882B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2607741B2 (en) * | 1990-07-12 | 1997-05-07 | シャープ株式会社 | Liquid crystal display |
| US5629784A (en) * | 1994-04-12 | 1997-05-13 | Ois Optical Imaging Systems, Inc. | Liquid crystal display with holographic diffuser and prism sheet on viewer side |
| US5963284A (en) * | 1998-04-01 | 1999-10-05 | Ois Optical Imaging Systems, Inc. | LCD with diffuser having diffusing particles therein located between polarizers |
| JP4873876B2 (en) * | 2005-03-28 | 2012-02-08 | オリンパス株式会社 | Light quantity adjustment mechanism, illumination unit equipped with the same, and microscope equipped with light quantity adjustment mechanism or illumination unit equipped with light quantity adjustment mechanism |
-
1976
- 1976-09-28 JP JP51116348A patent/JPS5911882B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5342054A (en) | 1978-04-17 |
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