JPH06308482A - Color liquid crystal display device - Google Patents
Color liquid crystal display deviceInfo
- Publication number
- JPH06308482A JPH06308482A JP5092669A JP9266993A JPH06308482A JP H06308482 A JPH06308482 A JP H06308482A JP 5092669 A JP5092669 A JP 5092669A JP 9266993 A JP9266993 A JP 9266993A JP H06308482 A JPH06308482 A JP H06308482A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal cell
- light
- plate
- polarizing 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はカラー液晶表示装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display device.
【０００２】[0002]
【従来の技術】液晶表示装置として、着色した表示が得
られるカラー液晶表示装置がある。図５は従来のカラー
液晶表示装置の断面図であり、この液晶表示装置は、カ
ラーフィルタを備えた液晶セル１０と、この液晶セル１
０をはさんで配置された一対の偏光板２１，２２とから
なっている。2. Description of the Related Art As a liquid crystal display device, there is a color liquid crystal display device which can obtain a colored display. FIG. 5 is a cross-sectional view of a conventional color liquid crystal display device. This liquid crystal display device includes a liquid crystal cell 10 having a color filter and a liquid crystal cell 1.
It is composed of a pair of polarizing plates 21 and 22 which are arranged with 0 interposed therebetween.
【０００３】上記液晶セル１０は、透明電極１３，１４
を形成しその上に配向膜１５，１６を形成した上下一対
の透明基板１１，１２を枠状のシール材１８を介して接
合し、この両基板１１，１２間の前記シール材１８で囲
まれた領域に液晶１９を封入したもので、この液晶セル
１０の一方の基板、例えば図において下基板１２には、
透過光を着色するためのカラーフィルタ１７が設けられ
ている。The liquid crystal cell 10 has transparent electrodes 13 and 14
And a pair of upper and lower transparent substrates 11 and 12 on which the alignment films 15 and 16 are formed are bonded to each other via a frame-shaped sealing material 18, and are surrounded by the sealing material 18 between the two substrates 11 and 12. A liquid crystal 19 is sealed in a closed region. One substrate of the liquid crystal cell 10, for example, the lower substrate 12 in the figure,
A color filter 17 for coloring the transmitted light is provided.
【０００４】なお、上記カラーフィルタ１７は基板１２
上に形成されており、この基板１２側の透明電極１４は
前記カラーフィルタ１７を覆う保護膜（図示せず）の上
に形成されている。また、上記液晶セル１０としては、
一般に、液晶１９の分子１９ａを両基板１１，１２間に
おいてほぼ９０°のツイスト角でツイスト配向させたＴ
Ｎ（ツイステッド・ネマティック）型のものが用いられ
ている。The color filter 17 is provided on the substrate 12
The transparent electrode 14 on the substrate 12 side is formed on a protective film (not shown) that covers the color filter 17. Further, as the liquid crystal cell 10,
Generally, the molecules 19a of the liquid crystal 19 are twist-aligned between the substrates 11 and 12 at a twist angle of about 90 °.
N (Twisted Nematic) type is used.
【０００５】また、上記一対の偏光板２１，２２は、そ
の透過軸を互いに平行にして配置されており、これら偏
光板２１，２２の透過軸は、液晶セル１０の一方の基板
側の液晶分子配向方向とほぼ平行な方向にある。The pair of polarizing plates 21 and 22 are arranged such that their transmission axes are parallel to each other. The transmission axes of these polarizing plates 21 and 22 are liquid crystal molecules on one substrate side of the liquid crystal cell 10. It is in a direction substantially parallel to the orientation direction.
【０００６】なお、液晶表示装置には、透過型のもの
と、裏面に反射板を配置した反射型のものとがあるが、
カラーフィルタを備えたカラー液晶表示装置は一般に、
図５に示したような透過型のものとされている。There are two types of liquid crystal display devices, a transmissive type and a reflective type in which a reflecting plate is arranged on the back surface.
A color liquid crystal display device equipped with a color filter is generally
It is of a transmissive type as shown in FIG.
【０００７】上記カラー液晶表示装置は、その裏面側に
光源（図示せず）を配置し、液晶セル１０の両基板１
１，１２の電極１３，１４間に電圧を印加して表示駆動
されるもので、光源からの光は、入射側（図５では下
側）の偏光板２２により直線偏光されて液晶セル１０に
入射する。In the color liquid crystal display device, a light source (not shown) is arranged on the back surface side thereof, and both substrates 1 of the liquid crystal cell 10 are arranged.
Display driving is performed by applying a voltage between the electrodes 13 and 14 of Nos. 1 and 12, and the light from the light source is linearly polarized by the polarizing plate 22 on the incident side (the lower side in FIG. 5) to the liquid crystal cell 10. Incident.
【０００８】そして、液晶セル１０に入射した直線偏光
は、カラーフィルタ１７と液晶層とを通って液晶セル１
０を出射するが、その場合、カラーフィルタ１７の色に
対応する波長帯域以外の波長光がカラーフィルタ１７で
吸収されるため、液晶セル１０を出射する光がカラーフ
ィルタ１７の色に着色された光となる。The linearly polarized light that has entered the liquid crystal cell 10 passes through the color filter 17 and the liquid crystal layer, and the liquid crystal cell 1
0 is emitted, but in that case, light having a wavelength other than the wavelength band corresponding to the color of the color filter 17 is absorbed by the color filter 17, so that the light emitted from the liquid crystal cell 10 is colored in the color of the color filter 17. Become light.
【０００９】また、液晶セル１０の電極１３，１４間に
電圧を印加していない状態、つまり液晶分子１９ａがツ
イスト配向している状態では、液晶セル１０を通る光が
液晶１９による偏光作用を受け、液晶層を通過し終った
ときに液晶セル１０に入射した直線偏光と直交する方向
の直線偏光になるため、このときは液晶セル１０を出射
した直線偏光が出射側（図５では上側）の偏光板２１で
吸収され、表示が暗（黒）状態になる。When no voltage is applied between the electrodes 13 and 14 of the liquid crystal cell 10, that is, when the liquid crystal molecules 19a are twist-aligned, the light passing through the liquid crystal cell 10 is polarized by the liquid crystal 19. Since the linearly polarized light in the direction orthogonal to the linearly polarized light that has entered the liquid crystal cell 10 when it has finished passing through the liquid crystal layer, the linearly polarized light that has exited the liquid crystal cell 10 is on the output side (upper side in FIG. 5). The light is absorbed by the polarizing plate 21, and the display is in a dark (black) state.
【００１０】一方、液晶セル１０の電極１３，１４間に
電圧を印加すると、液晶分子１９ａが基板１１，１２面
に対してほぼ垂直に立上り配向し、液晶１９による偏光
作用はほとんどなくなるため、液晶セル１０に入射した
直線偏光がそのまま液晶セル１０を出射する。そして、
このときは、液晶セル１０を出射した直線偏光が出射側
偏光板２１を透過し、表示が、カラーフィルタ１７によ
り着色された色の明表示になる。On the other hand, when a voltage is applied between the electrodes 13 and 14 of the liquid crystal cell 10, the liquid crystal molecules 19a rise and orient substantially vertically to the surfaces of the substrates 11 and 12, and the polarization effect of the liquid crystal 19 is almost eliminated. The linearly polarized light that has entered the cell 10 exits the liquid crystal cell 10 as it is. And
At this time, the linearly polarized light emitted from the liquid crystal cell 10 is transmitted through the emission side polarizing plate 21, and the display becomes a bright display of the color colored by the color filter 17.
【００１１】[0011]
【発明が解決しようとする課題】しかしながら、上記従
来のカラー液晶表示装置は、カラーフィルタ１７を用い
て透過光を着色するものであるため、光の透過率が低
く、したがって表示が暗いという問題をもっている。However, since the above-mentioned conventional color liquid crystal display device colors the transmitted light by using the color filter 17, it has a problem that the light transmittance is low and therefore the display is dark. There is.
【００１２】これは、カラーフィルタ１７での光の吸収
によるものであり、カラーフィルタ１７は、その色に対
応する波長帯域の光もかなり高い吸収率で吸収するた
め、カラーフィルタ１７を通った着色光が、カラーフィ
ルタ１７に入射する前の前記波長帯域の光に比べて大幅
に光量を減じた光になり、表示が暗くなってしまう。This is due to the absorption of light by the color filter 17. Since the color filter 17 also absorbs light in the wavelength band corresponding to the color with a considerably high absorption rate, coloring through the color filter 17 is performed. The light becomes light in which the amount of light is significantly reduced compared to the light in the wavelength band before entering the color filter 17, and the display becomes dark.
【００１３】なお、図５に示したカラー液晶表示装置は
透過型のものであるが、このカラー液晶表示装置の裏面
に反射板を配置して反射型装置とすると、装置の表面側
から入射し、裏面の反射板で反射されて表面側に出射す
る光がカラーフィルタ１７を２度通って二重に光量を減
じるため、表示がかなり暗くなって、表示装置としては
ほとんど使用できなくなる。Although the color liquid crystal display device shown in FIG. 5 is of a transmissive type, if a reflection plate is arranged on the back surface of this color liquid crystal display device to form a reflection type device, light is incident from the front side of the device. Since the light reflected by the reflecting plate on the back surface and emitted to the front surface side passes through the color filter 17 twice and the light amount is doubly reduced, the display is considerably darkened and becomes almost unusable as a display device.
【００１４】本発明は、カラーフィルタを用いずに透過
光を着色して光の透過率を高くし、表示の明るさを十分
高くすることができるカラー液晶表示装置を提供するこ
とを目的としたものである。It is an object of the present invention to provide a color liquid crystal display device capable of coloring transmitted light without using a color filter to increase the light transmittance and sufficiently increase the display brightness. It is a thing.
【００１５】[0015]
【課題を解決するための手段】本発明のカラー液晶表示
装置は、透明電極を形成した一対の透明基板間に液晶を
封入しその分子をホモジニアス配向させた液晶セルと、
１枚の位相板と、１枚の偏光板と、反射板とを備え、前
記偏光板を前記液晶セルの表面側に配置し、前記反射板
を前記液晶セルの裏面側に配置するとともに、前記偏光
板と反射板のいずれかと前記液晶セルとの間に前記位相
板を配置してなり、かつ、前記位相板の遅相軸と前記液
晶セルの液晶分子配向方向とを互いにほぼ平行にするか
あるいはほぼ直交させ、前記偏光板の透過軸を前記位相
板の遅相軸に対して所定角度斜めにずらしたことを特徴
とするものである。本発明において、上記偏光板の透過
軸と位相板の遅相軸とのずれ角は４５±５°であるのが
望ましい。A color liquid crystal display device of the present invention comprises a liquid crystal cell in which a liquid crystal is sealed between a pair of transparent substrates having transparent electrodes, and the molecules of which are homogeneously aligned.
A phase plate, a polarizing plate, and a reflecting plate, wherein the polarizing plate is arranged on the front surface side of the liquid crystal cell, the reflecting plate is arranged on the rear surface side of the liquid crystal cell, and Whether the phase plate is arranged between any one of a polarizing plate and a reflection plate and the liquid crystal cell, and whether the slow axis of the phase plate and the liquid crystal molecule alignment direction of the liquid crystal cell are substantially parallel to each other. Alternatively, the transmission axes of the polarizing plates are made to be substantially orthogonal to each other and the transmission axis of the polarizing plate is slanted by a predetermined angle with respect to the slow axis of the phase plate. In the present invention, the deviation angle between the transmission axis of the polarizing plate and the slow axis of the phase plate is preferably 45 ± 5 °.
【００１６】[0016]
【作用】このカラー液晶表示装置は、その表面側から入
射する光を裏面側の反射板で反射させて表示する反射型
のものであり、表面側からの入射光は、偏光板と位相板
と液晶セルを通って反射板で反射され、再び前記液晶セ
ルと位相板と偏光板を通って出射する。This color liquid crystal display device is of a reflection type in which light incident from the front surface side is reflected by the reflection plate on the rear surface side and displayed. The incident light from the front surface side is reflected by the polarizing plate and the phase plate. The light passes through the liquid crystal cell, is reflected by the reflection plate, and is emitted again through the liquid crystal cell, the phase plate and the polarizing plate.
【００１７】このカラー液晶表示装置においては、偏光
板の透過軸と位相板の遅相軸とを所定角度斜めにずらす
とともに、位相板の遅相軸と液晶セルの液晶分子配向方
向（ホモジニアス配向方向）とを互いにほぼ平行にする
かあるいはほぼ直交させているため、偏光板を通って入
射した直線偏光が、位相板と液晶セルとを通る過程でこ
れらの偏光作用により偏光状態を変えられるとともに、
反射板で反射されて再び液晶セルおよび位相板を通る過
程でさらに偏光状態を変えられて前記偏光板に入射す
る。In this color liquid crystal display device, the transmission axis of the polarizing plate and the slow axis of the phase plate are slanted by a predetermined angle, and the slow axis of the phase plate and the liquid crystal molecule alignment direction (homogeneous alignment direction) of the liquid crystal cell. ) And are substantially parallel to each other or substantially orthogonal to each other, linearly polarized light that has entered through the polarizing plate can change the polarization state due to these polarization effects in the process of passing through the phase plate and the liquid crystal cell.
The light is reflected by the reflection plate and again changed in polarization state in the process of passing through the liquid crystal cell and the phase plate, and then enters the polarizing plate.
【００１８】また、液晶セルの電極間に電圧を印加する
と、液晶分子の配向状態の変化により液晶セルでの偏光
作用が変化するため、位相板と液晶セルとによる偏光作
用を受けた光が、電圧無印加状態（液晶分子がホモジニ
アス配向している状態）とは異なる偏光状態の光となっ
て偏光板に入射し、さらに液晶分子がほぼ垂直に立上が
り配向すると、液晶セルによる偏光作用がほとんど無く
なり、偏光板を通って入射した直線偏光が位相板による
偏光作用だけを受けて偏光板に入射する。When a voltage is applied between the electrodes of the liquid crystal cell, the polarization effect of the liquid crystal cell changes due to the change of the alignment state of the liquid crystal molecules. When light with a polarization state different from that in which no voltage is applied (where the liquid crystal molecules are homogeneously aligned) is incident on the polarizing plate, and when the liquid crystal molecules rise almost vertically and are aligned, the polarization effect of the liquid crystal cell is almost eliminated. The linearly polarized light that has entered through the polarizing plate receives only the polarization effect of the phase plate and enters the polarizing plate.
【００１９】このため、偏光板を通って入射し位相板と
液晶セルとを２度ずつ通って再び前記偏光板に入射する
光の偏光状態は、液晶セルの液晶分子配向状態により変
化し、ある状態では偏光板に入射する光が入射時と同じ
直線偏光となり、他の状態では非直線偏光となる。For this reason, the polarization state of the light that enters through the polarizing plate, passes through the phase plate and the liquid crystal cell twice, and then enters the polarizing plate again, changes depending on the liquid crystal molecule alignment state of the liquid crystal cell. In the state, the light incident on the polarizing plate becomes the same linearly polarized light as when the light enters, and in the other states, it becomes the non-linearly polarized light.
【００２０】そして、偏光板に入射する光が入射時と同
じ直線偏光であれば、全ての波長光が偏光板を透過する
ため、このときは出射光が無着色光となり、また偏光板
に入射する光が非直線偏光であるときは、その光のうち
偏光板を透過する偏光成分の波長光だけが偏光板を通っ
て出射し、出射光が着色光になる。If the light incident on the polarizing plate is the same linearly polarized light as at the time of incidence, all wavelength light is transmitted through the polarizing plate, and at this time, the emitted light becomes uncolored light and is incident on the polarizing plate. When the light to be emitted is non-linearly polarized light, only the light of the wavelength of the polarization component that passes through the polarizing plate out of the light is emitted through the polarizing plate, and the emitted light becomes colored light.
【００２１】したがって、本発明のカラー液晶表示装置
によれば、従来の液晶表示装置のようにカラーフィルタ
を用いずに透過光を着色することができ、したがって着
色光の光量は、表示装置に入射する光のうちの前記着色
光となる波長帯域の光の量とほとんど変わらないから、
光の透過率を高くして、表示の明るさを十分高くするこ
とができる。Therefore, according to the color liquid crystal display device of the present invention, it is possible to color the transmitted light without using a color filter as in the conventional liquid crystal display device, and therefore the amount of the colored light is incident on the display device. The amount of light in the wavelength band that becomes the colored light out of the
By increasing the light transmittance, the brightness of the display can be sufficiently increased.
【００２２】[0022]
【実施例】以下、本発明の第１の実施例を図１〜図３を
参照して説明する。図１はカラー液晶表示装置の断面図
である。このカラー液晶表示装置は、液晶分子をホモジ
ニアス配向させた１つの液晶セル３０と、１枚の位相板
４０と、１枚の偏光板４１と、１枚の反射板４２とから
なっており、前記偏光板４１は液晶セル３０の表面（図
において上面）側に配置され、前記反射板４２は液晶セ
ル３０の裏面（図において下面）側に配置され、また位
相板４０は前記液晶セル３０と偏光板４１との間に配置
されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a color liquid crystal display device. This color liquid crystal display device comprises one liquid crystal cell 30 in which liquid crystal molecules are homogeneously aligned, one phase plate 40, one polarizing plate 41, and one reflecting plate 42. The polarizing plate 41 is arranged on the front surface (upper surface in the figure) of the liquid crystal cell 30, the reflection plate 42 is arranged on the rear surface (lower surface in the drawing) of the liquid crystal cell 30, and the phase plate 40 polarizes the liquid crystal cell 30. It is arranged between the plate 41.
【００２３】上記液晶セル３０は、透明電極３３，３４
を形成しその上に水平配向膜３５，３６を形成した一対
の透明基板３１，３２を枠状のシール材３７を介して接
合し、この両基板３１，３２間の前記シール材３７で囲
まれた領域に液晶３８を封入したもので、両基板３１，
３２上の水平配向膜３５，３６は互いに平行な方向に配
向処理されており、液晶３８の分子３８ａは、一方向に
ホモジニアス配向されている。The liquid crystal cell 30 includes transparent electrodes 33 and 34.
And a pair of transparent substrates 31 and 32 on which the horizontal alignment films 35 and 36 are formed are bonded to each other via a frame-shaped sealing material 37, and surrounded by the sealing material 37 between the substrates 31 and 32. The liquid crystal 38 is sealed in the open area.
The horizontal alignment films 35 and 36 on 32 are aligned in a direction parallel to each other, and the molecules 38a of the liquid crystal 38 are homogeneously aligned in one direction.
【００２４】一方、位相板４０は、上記液晶セル３０の
初期リタデーション（電圧無印加状態でのリタデーショ
ン）とほぼ等しいリタデーションをもつものとされてお
り、この位相板４０は、その遅相軸を液晶セル３０の液
晶分子配向方向（ホモジニアス配向方向）と直交させて
配置されている。On the other hand, the phase plate 40 is supposed to have a retardation almost equal to the initial retardation of the liquid crystal cell 30 (retardation when no voltage is applied). The cells 30 are arranged so as to be orthogonal to the liquid crystal molecule alignment direction (homogeneous alignment direction) of the cell 30.
【００２５】また、偏光板４１は、その透過軸を上記位
相板４０の遅相軸に対して所定角度斜めにずらした状態
で配置されている。図２は、上記液晶表示装置における
液晶セル３０の液晶分子配向方向と、位相板４０の遅相
軸と、偏光板４１の透過軸とを示す平面図であり、位相
板４０の遅相軸４０ａは、液晶セル３０の液晶分子配向
方向３０ａとほぼ直交している。また、図２において、
４１ａは偏光板４１の透過軸であり、この実施例では、
偏光板４１の透過軸４１ａと位相板４０の遅相軸４０ａ
とのずれ角ψを４５°としている。Further, the polarizing plate 41 is arranged such that its transmission axis is slanted by a predetermined angle with respect to the slow axis of the phase plate 40. 2 is a plan view showing a liquid crystal molecule alignment direction of the liquid crystal cell 30, a slow axis of the phase plate 40, and a transmission axis of the polarizing plate 41 in the liquid crystal display device. The slow axis 40a of the phase plate 40 is shown in FIG. Are substantially orthogonal to the liquid crystal molecule alignment direction 30a of the liquid crystal cell 30. In addition, in FIG.
41a is a transmission axis of the polarizing plate 41, and in this embodiment,
The transmission axis 41a of the polarizing plate 41 and the slow axis 40a of the phase plate 40
The deviation angle ψ with respect to is 45 °.
【００２６】上記カラー液晶表示装置は、その表面（上
面）側から入射する光（自然光または照明光源からの
光）を裏面側の反射板４２で反射させて表示する反射型
のものであり、表面側からの入射光は、偏光板４１と位
相板４０と液晶セル３０を通って反射板４２で反射さ
れ、再び液晶セル３０と位相板４０と偏光板４１を通っ
て出射する。また、このカラー液晶表示装置は、液晶セ
ル３０の両基板３１，３２の電極３３，３４間に電圧を
印加して表示駆動される。The color liquid crystal display device is of a reflection type in which light (natural light or light from an illumination light source) incident from the front surface (upper surface) side is reflected by the reflection plate 42 on the rear surface side for display. The incident light from the side passes through the polarizing plate 41, the phase plate 40 and the liquid crystal cell 30, is reflected by the reflecting plate 42, and is emitted again through the liquid crystal cell 30, the phase plate 40 and the polarizing plate 41. Further, this color liquid crystal display device is driven for display by applying a voltage between the electrodes 33 and 34 of both substrates 31 and 32 of the liquid crystal cell 30.
【００２７】このカラー液晶表示装置においては、偏光
板４１の透過軸４１ａと位相板４０の遅相軸４０ａとを
所定角度斜めにずらしているため、偏光板４１を通って
入射した直線偏光が、位相板４０を通る過程でこの位相
板４０の偏光作用により楕円偏光となる。In this color liquid crystal display device, since the transmission axis 41a of the polarizing plate 41 and the slow axis 40a of the phase plate 40 are slanted by a predetermined angle, the linearly polarized light incident through the polarizing plate 41 is While passing through the phase plate 40, it becomes elliptically polarized light due to the polarization effect of the phase plate 40.
【００２８】また、上記液晶セル３０は液晶分子３８ａ
をホモジニアス配向させたものであるため、この液晶セ
ル３０は電圧無印加状態ではホモジニアス配向している
液晶分子３８ａの長軸方向に遅相軸がある位相板と考え
てよい。そして、この液晶セル３０の液晶分子配向方向
３０ａは位相板４０の遅相軸４０ａと直交しているた
め、液晶分子３８ａがホモジニアス配向している状態で
は、上記位相板４０を通る過程で楕円偏光された光が、
液晶セル３０を通る過程で液晶セル３０の偏光作用によ
りさらに偏光状態を変えられる。The liquid crystal cell 30 includes liquid crystal molecules 38a.
Therefore, the liquid crystal cell 30 may be considered as a phase plate having a slow axis in the major axis direction of the liquid crystal molecules 38a that are homogeneously aligned in the absence of applied voltage. The liquid crystal molecule orientation direction 30a of the liquid crystal cell 30 is orthogonal to the slow axis 40a of the phase plate 40. The light is
In the process of passing through the liquid crystal cell 30, the polarization state of the liquid crystal cell 30 can further change the polarization state.
【００２９】そして、このカラー液晶表示装置では、偏
光板４１を通って入射した光が、位相板４０と液晶セル
３０とを通る過程でこれらの偏光作用により偏光状態を
変えられるとともに、反射板４２で反射されて再び液晶
セル３０および位相板４０を通る過程でさらに偏光状態
を変えられて前記偏光板４１に入射する。In this color liquid crystal display device, the light incident through the polarizing plate 41 is changed in polarization state by the polarization action of the light while passing through the phase plate 40 and the liquid crystal cell 30, and the reflecting plate 42 is also included. The light is reflected by, and is changed in polarization state in the process of passing through the liquid crystal cell 30 and the phase plate 40 again, and is incident on the polarizing plate 41.
【００３０】また、液晶セル３０の電極３３，３４間に
電圧を印加すると、液晶分子３８ａの配向状態がホモジ
ニアス配向状態から基板３１，３２面に対して立上るよ
うに変化し、この液晶分子３８ａの配向状態の変化によ
り液晶セル３０での偏光作用が変化するため、位相板４
０と液晶セル３０による偏光作用を受けた光が、電圧無
印加状態とは異なる偏光状態の光となって偏光板４１に
入射し、さらに液晶分子３８ａがほぼ垂直に立上がり配
向すると、液晶セル３０による偏光作用がほとんど無く
なり、偏光板４１を通って入射した直線偏光が位相板４
０による偏光作用だけを受けて前記偏光板４１に入射す
る。When a voltage is applied between the electrodes 33 and 34 of the liquid crystal cell 30, the alignment state of the liquid crystal molecules 38a changes from the homogeneous alignment state to rise to the surfaces of the substrates 31 and 32, and the liquid crystal molecules 38a. Since the polarization effect in the liquid crystal cell 30 changes due to the change in the alignment state of the phase plate 4,
0 and the light polarized by the liquid crystal cell 30 becomes a light in a polarization state different from the state in which no voltage is applied and enters the polarizing plate 41. Further, when the liquid crystal molecules 38a rise vertically and are aligned, the liquid crystal cell 30 The polarization effect due to is almost eliminated, and the linearly polarized light that has entered through the polarizing plate 41 is transmitted through the phase plate 4
Only the polarization effect of 0 is received and the light enters the polarizing plate 41.
【００３１】すなわち、位相板４０のリタデーションＲ
ｅ1 は、この位相板４０の位相板の屈折率異方性（Δｎ
1 ）とその板厚（ｄ1 ）との積（Δｎ1 ・ｄ1 ）によっ
て決まり、液晶分子３８ａをホモジニアス配向させた液
晶セル３０のリタデーションＲｅ2 は、液晶３８の屈折
率異方性（Δｎ2 ）と液晶層厚（ｄ2 ）との積（Δｎ2
・ｄ2 ）によって決まるが、液晶３８の屈折率異方性Δ
ｎ2 は、見掛け上、電圧の印加により液晶分子３８ａが
立上り配向するのにともなって小さくなり、液晶分子３
８ａが垂直に立上り配向したときに“０”となるため、
液晶セル３０のΔｎ2 ・ｄ2 つまりリタデーションＲｅ
2 が“０”となって偏光作用が無くなり、透過光が位相
板４０による偏光作用だけを受ける。That is, the retardation R of the phase plate 40
e 1 is the refractive index anisotropy (Δn
1 ) and the plate thickness (d 1 ) thereof (Δn 1 · d 1 ), the retardation Re 2 of the liquid crystal cell 30 in which the liquid crystal molecules 38a are homogeneously aligned is determined by the refractive index anisotropy (Δn 1 ) of the liquid crystal 38. 2 ) and the liquid crystal layer thickness (d 2 ) (Δn 2
.D 2 ), but the refractive index anisotropy Δ of the liquid crystal 38
Apparently, n 2 becomes smaller as the liquid crystal molecules 38a rise and align due to the application of voltage, and the liquid crystal molecules 3
Since 8a is “0” when vertically oriented,
Δn 2 · d 2 of the liquid crystal cell 30, that is, the retardation Re
2 becomes “0” and the polarization effect disappears, and the transmitted light receives only the polarization effect by the phase plate 40.
【００３２】このため、偏光板４１を通って入射し位相
板４０と液晶セル３０とを２度ずつ通って再び前記偏光
板４１に入射する光の偏光状態は、液晶セル３０の液晶
分子配向状態により変化し、ある状態では偏光板４１に
入射する光が入射時と同じ直線偏光となり、他の状態で
は非直線偏光となる。Therefore, the polarization state of the light that enters through the polarizing plate 41, passes through the phase plate 40 and the liquid crystal cell 30 twice, and then enters the polarizing plate 41 again, the polarization state of the liquid crystal molecules of the liquid crystal cell 30 is the same. The light incident on the polarizing plate 41 becomes linearly polarized light in the certain state and becomes non-linearly polarized light in the other state.
【００３３】そして、偏光板４１に入射する光が入射時
と同じ直線偏光であれば、全ての波長光が偏光板４１を
透過するため、このときは出射光が無着色光となり、ま
た偏光板４１に入射する光が非直線偏光であるときは、
その光のうち偏光板４１を透過する偏光成分の波長光だ
けが偏光板４１を通って出射し、出射光が着色光にな
る。If the light incident on the polarizing plate 41 is the same linearly polarized light as at the time of incidence, all wavelength light is transmitted through the polarizing plate 41, and at this time, the emitted light becomes uncolored light and the polarizing plate. When the light incident on 41 is non-linearly polarized light,
Of the light, only the wavelength light of the polarization component that passes through the polarizing plate 41 is emitted through the polarizing plate 41, and the emitted light becomes colored light.
【００３４】なお、この実施例では、位相板４０のリタ
デーションＲｅ1 と液晶セル３０のリタデーションＲｅ
2 とをほぼ等しくし、位相板４０の遅相軸４０ａと液晶
セル３０の液晶分子配向方向３０ａとを互いに直交させ
るとともに、位相板４０の遅相軸４０ａと偏光板の透過
軸４１ａとのずれ角ψを４５°としているため、液晶セ
ル３０に電圧を印加していないとき、つまり液晶分子３
８ａがホモジニアス配向状態にあるときに、位相板４０
と液晶セル３０とを２度ずつ通った光が、偏光板４０を
通って入射したときの直線偏光とほぼ同じ直線偏光とな
り、偏光板４１を通って出射する光が、白色光に近い無
着色光になる。In this embodiment, the retardation Re 1 of the phase plate 40 and the retardation Re 1 of the liquid crystal cell 30 are used.
2 are made substantially equal to each other, and the slow axis 40a of the phase plate 40 and the liquid crystal molecule alignment direction 30a of the liquid crystal cell 30 are orthogonal to each other, and the slow axis 40a of the phase plate 40 and the transmission axis 41a of the polarizing plate are deviated from each other. Since the angle ψ is 45 °, when the voltage is not applied to the liquid crystal cell 30, that is, the liquid crystal molecules 3
8a is in a homogeneous orientation state, the phase plate 40
And light passing through the liquid crystal cell 30 twice become linearly polarized light which is almost the same as the linearly polarized light when entering through the polarizing plate 40, and the light emitted through the polarizing plate 41 is uncolored close to white light. Become light.
【００３５】したがって、上記カラー液晶表示装置によ
れば、従来のカラー液晶表示装置のようにカラーフィル
タを用いずに透過光を着色することができ、したがって
着色光の光量は、表示装置に入射する光のうちの前着色
光となる波長帯域の光の量とほとんど変わらないから、
光の透過率を高くして、表示の明るさを十分高くするこ
とができる。Therefore, according to the color liquid crystal display device described above, the transmitted light can be colored without using a color filter as in the conventional color liquid crystal display device, so that the amount of the colored light is incident on the display device. Since it is almost the same as the amount of light in the wavelength band that becomes pre-colored light,
By increasing the light transmittance, the brightness of the display can be sufficiently increased.
【００３６】すなわち、従来のカラー液晶表示装置で
は、表示装置に入射する光のうちの着色光となる波長帯
域の光量に比べて、カラーフィルタを通った着色光の光
量がかなり減少するが、上記カラー液晶表示装置では、
このような光量の減少はほとんど生じない。このため、
上記実施例のカラー液晶表示装置は、反射型のものであ
っても、その表示の明るさは十分である。上記カラー液
晶表示装置における表示の明るさについて説明すると、
この表示装置を出射する光の強度Ｉは次の (1)式で表わ
される。That is, in the conventional color liquid crystal display device, the amount of colored light passing through the color filter is considerably reduced as compared with the amount of light in the wavelength band which becomes colored light in the light incident on the display device. In the color liquid crystal display device,
Such a decrease in light amount hardly occurs. For this reason,
Even if the color liquid crystal display device of the above embodiment is a reflection type, the display brightness is sufficient. Explaining the display brightness in the color liquid crystal display device,
The intensity I of the light emitted from this display device is expressed by the following equation (1).
【００３７】[0037]
【数１】 [Equation 1]
【００３８】この (1)式で求められる光強度Ｉの値は、
白表示のとき、つまり液晶セル３０の液晶分子３８ａが
ホモジニアス配向状態にあって出射光が無着色光となっ
たときで、表示装置に入射する全ての波長光（可視光）
の強度のほぼ１／２であり、したがって十分明るい表示
が得られる。The value of the light intensity I obtained by the equation (1) is
At the time of white display, that is, when the liquid crystal molecules 38a of the liquid crystal cell 30 are in a homogeneous alignment state and the emitted light is uncolored light, all wavelength light (visible light) incident on the display device is displayed.
The intensity is about 1/2, and thus a sufficiently bright display can be obtained.
【００３９】また、従来のカラー液晶表示装置では、そ
の表示色がカラーフィルタの色によって決まってしまう
が、上記実施例のカラー液晶表示装置は、液晶セル３０
への印加電圧を制御することによって表示色を変化させ
ることができる。Further, in the conventional color liquid crystal display device, the display color is determined by the color of the color filter, but in the color liquid crystal display device of the above embodiment, the liquid crystal cell 30 is used.
The display color can be changed by controlling the voltage applied to the display.
【００４０】図３は上記カラー液晶表示装置のＣＩＥ色
度図であり、ここでは、位相板４０のリタデーションＲ
ｅ1 と液晶セル３０のリタデーションＲｅ2 とをＲｅ1
＝Ｒｅ2 ＝９００ｎｍとしたときの色度を示している。FIG. 3 is a CIE chromaticity diagram of the above-mentioned color liquid crystal display device. Here, the retardation R of the phase plate 40 is used.
e 1 and the retardation Re 2 of the liquid crystal cell 30 are set to Re 1
It shows the chromaticity when = Re 2 = 900 nm.
【００４１】この色度図のように、上記カラー液晶表示
装置の表示色は、液晶セル３０に印加する電圧を高くし
ていくのにともなって、電圧０状態、つまり液晶分子３
８ａがホモジニアス配向している状態での初期表示色か
ら、電圧最大状態、つまり液晶分子３８ａが垂直に立上
り配向した状態での最終表示色まで変化するが、その途
中で、表示の光強度Ｉが高くかつ色純度も高い表示色に
なる。As shown in the chromaticity diagram, the display color of the color liquid crystal display device is in the zero voltage state, that is, the liquid crystal molecules 3 as the voltage applied to the liquid crystal cell 30 is increased.
8a changes from the initial display color in the homogeneously aligned state to the maximum voltage state, that is, the final display color in the state in which the liquid crystal molecules 38a vertically rise and orients. The display color is high and the color purity is high.
【００４２】なお、このカラー液晶表示装置の初期表示
色、つまり液晶セル３０の液晶分子３８ａがホモジニア
ス配向状態にあるときの表示色は上述したように“白”
である。The initial display color of this color liquid crystal display device, that is, the display color when the liquid crystal molecules 38a of the liquid crystal cell 30 are in the homogeneous alignment state is "white" as described above.
Is.
【００４３】また、この実施例では、位相板４０のリタ
デーションＲｅ1 が９００ｎｍ、偏光板４０の透過軸４
０ａと位相板４０の遅相軸４０ａとのずれ角ψが４５°
であるため、液晶セル３０に液晶分子３８ａが垂直に立
上り配向する電圧を印加したとき、つまり、液晶セル３
０による偏光作用が無くなって透過光が位相板４０によ
る偏光作用だけを受けるときは、位相板４０を反射板４
２側に向かって通る過程で楕円偏光となった光が、位相
板４０を偏光板４１側に向かって通る過程で、偏光板４
０を通って入射したときの直線偏光に近い直線偏光状の
光となる。Further, in this embodiment, the retardation Re 1 of the phase plate 40 is 900 nm and the transmission axis 4 of the polarizing plate 40.
0a and the slow axis 40a of the phase plate 40 have a deviation angle ψ of 45 °
Therefore, when a voltage for vertically aligning the liquid crystal molecules 38a is applied to the liquid crystal cell 30, that is, the liquid crystal cell 3
When the polarization effect due to 0 disappears and the transmitted light receives only the polarization effect due to the phase plate 40, the phase plate 40 is moved to the reflection plate 4
The light that has become elliptically polarized light in the process of passing toward the second side passes through the phase plate 40 toward the side of the polarizing plate 41.
The light becomes a linearly polarized light which is close to the linearly polarized light when entering through 0.
【００４４】このため、このカラー液晶表示装置は、液
晶分子３８ａがほぼ垂直に立上り配向する電圧最大状態
での最終表示色はほぼ“白”であり、電圧を高くしてい
くのにともなう表示色の変化は、白（初期表示色）→赤
→青→赤→青→黄→青→緑→白（最終表示色）である。Therefore, in this color liquid crystal display device, the final display color is almost "white" in the maximum voltage state in which the liquid crystal molecules 38a rise and are aligned almost vertically, and the display color accompanying an increase in voltage. Changes from white (initial display color) → red → blue → red → blue → yellow → blue → green → white (final display color).
【００４５】したがって、上記カラー液晶表示装置は、
液晶セル３０への印加電圧を制御することによって、そ
の表示色を上記各色に任意に変えることができる。ま
た、上記カラー液晶表示装置は、液晶分子をホモジニア
ス配向させた１つの液晶セル３０と、１枚の位相板４０
と、１枚の偏光板４１と、１枚の反射板４２との４つの
要素だけで構成されるものであるから、構成が簡単で、
低コストに得ることができる。Therefore, the color liquid crystal display device described above is
By controlling the voltage applied to the liquid crystal cell 30, the display color can be arbitrarily changed to each of the above colors. In addition, the color liquid crystal display device includes one liquid crystal cell 30 in which liquid crystal molecules are homogeneously aligned and one phase plate 40.
Since it is composed of only four elements, that is, one polarizing plate 41 and one reflecting plate 42, the configuration is simple,
It can be obtained at low cost.
【００４６】しかも、上記実施例のカラー液晶表示装置
では、上記 (1)式のように、出射光の強度Ｉが位相板４
０と液晶セル３０とのリタデーション差（Ｒｅ1 −Ｒｅ
2 ）によって決まるため、温度の変化によって位相板４
０と液晶セル３０のリタデーションＲｅ1 ，Ｒｅ2 の値
が変化しても光強度Ｉの変化は小さく（位相板４０と液
晶セル３０との温度特性が同じであれば光強度Ｉは変化
しない）、したがって、温度の変化による表示の明るさ
や表示色の変化を小さくすることができる。Moreover, in the color liquid crystal display device of the above-mentioned embodiment, the intensity I of the emitted light is equal to the phase plate 4 as shown in the above expression (1).
0 and the liquid crystal cell 30 retardation difference (Re 1 -Re
2 ), the phase plate 4 changes depending on the temperature.
0 and the values of the retardations Re 1 and Re 2 of the liquid crystal cell 30 change little (the light intensity I does not change if the temperature characteristics of the phase plate 40 and the liquid crystal cell 30 are the same). Therefore, it is possible to reduce changes in display brightness and display color due to changes in temperature.
【００４７】なお、上記第１の実施例では、位相板４０
の遅相軸４０ａと液晶セル３０の液晶分子配向方向３０
ａとをほぼ直交させているが、前記位相板４０は、その
遅相軸４０ａを液晶セル３０の液晶分子配向方向３０ａ
とほぼ平行にして配置してもよく、その場合でも、上記
実施例と同様な効果が得られる。In the first embodiment, the phase plate 40
Slow axis 40a and liquid crystal molecule orientation direction 30 of liquid crystal cell 30
The phase plate 40 has a slow axis 40a, which is substantially orthogonal to a, and whose slow axis 40a is aligned with the liquid crystal molecule alignment direction 30a of the liquid crystal cell 30.
They may be arranged substantially in parallel with, and in that case, the same effect as that of the above embodiment can be obtained.
【００４８】図４は本発明の第２の実施例による、液晶
セル３０の液晶分子配向方向と、位相板４０の遅相軸
と、偏光板４１の透過軸とを示す平面図であり、この実
施例では、位相板４０の遅相軸４０ａを、液晶セル３０
の液晶分子配向方向３０ａに対してほぼ平行にしてい
る。また、図４において、４１ａは偏光板４１の透過軸
であり、この実施例では、偏光板４１の透過軸４１ａ
を、上記位相板４０の遅相軸４０ａに対して４５°斜め
方向にずらしている。この第２の実施例のカラー液晶表
示装置における表示の明るさ、つまり表示装置を出射す
る光の強度Ｉは次の (3)式で表わされる。FIG. 4 is a plan view showing the alignment direction of liquid crystal molecules of the liquid crystal cell 30, the slow axis of the phase plate 40, and the transmission axis of the polarizing plate 41 according to the second embodiment of the present invention. In the embodiment, the slow axis 40a of the phase plate 40 is connected to the liquid crystal cell 30.
Is almost parallel to the liquid crystal molecule alignment direction 30a. Further, in FIG. 4, 41a is a transmission axis of the polarizing plate 41, and in this embodiment, the transmission axis 41a of the polarizing plate 41 is used.
Are shifted obliquely by 45 ° with respect to the slow axis 40a of the phase plate 40. The brightness of the display in the color liquid crystal display device of the second embodiment, that is, the intensity I of the light emitted from the display device is expressed by the following equation (3).
【００４９】[0049]
【数２】 [Equation 2]
【００５０】この (2)式で求められる光強度Ｉの値も、
白表示のときは液晶表示装置に入射する全ての波長光
（可視光）の強度のほぼ１／２であり、したがって表示
の明るさは十分である。The value of the light intensity I obtained by the equation (2) is also
At the time of white display, the intensity of all wavelength light (visible light) incident on the liquid crystal display device is approximately 1/2, and therefore the brightness of the display is sufficient.
【００５１】また、この実施例においては、位相板４０
のリタデーションＲｅ1 と液晶セル３０のリタデーショ
ンＲｅ2 を同じにしても異ならせてもよく、いずれも場
合も、透過光の偏光状態が液晶セル３０の液晶分子配向
状態により変化し、ある状態では偏光板４１に入射する
光が入射時と同じ直線偏光となり、他の状態では非直線
偏光となるため、出射光が無着色光となる“白”の表示
と、出射光が着色光となる着色表示とを得ることができ
るし、また液晶セル３０に印加する電圧を制御すること
によって表示色を変えることができる。Also, in this embodiment, the phase plate 40
Retardation Re 1 and may be also varied in the retardation Re 2 of the liquid crystal cell 30 the same, if any, the polarization state of the transmitted light is changed by the liquid crystal molecular alignment state of the liquid crystal cell 30, polarizing in one state Since the light incident on the plate 41 becomes the same linearly polarized light as when it is incident and becomes non-linearly polarized light in the other states, "white" display in which the emitted light is uncolored light and colored display in which the emitted light is colored light And the display color can be changed by controlling the voltage applied to the liquid crystal cell 30.
【００５２】なお、上記第１および第２の実施例では、
偏光板４１の透過軸４１ａと位相板４０の遅相軸４０ａ
とのずれ角ψを４５°としたが、このずれ角ψは、４５
°に限らず任意に選ぶことができる。ただし、位相板４
０による着色効果を十分に得るには、前記ずれ角ψを４
５±５°とするのが望ましい。In the above first and second embodiments,
The transmission axis 41a of the polarizing plate 41 and the slow axis 40a of the phase plate 40
The deviation angle ψ with respect to is set to 45 °, but this deviation angle ψ is 45
Not limited to °, it can be selected arbitrarily. However, the phase plate 4
In order to sufficiently obtain the coloring effect by 0, the shift angle ψ is set to 4
It is desirable that the angle is 5 ± 5 °.
【００５３】さらに、上記実施例では、位相板４０を液
晶セル３０と偏光板４１との間に配置したが、前記位相
板４０は、液晶セル３０と反射板４２との間に配置して
もよい。Further, in the above embodiment, the phase plate 40 is arranged between the liquid crystal cell 30 and the polarizing plate 41, but the phase plate 40 may be arranged between the liquid crystal cell 30 and the reflection plate 42. Good.
【００５４】[0054]
【発明の効果】本発明のカラー液晶表示装置は、透明電
極を形成した一対の透明基板間に液晶を封入しその分子
をホモジニアス配向させた液晶セルと、１枚の位相板
と、１枚の偏光板と、反射板とを備え、前記偏光板を前
記液晶セルの表面側に配置し、前記反射板を前記液晶セ
ルの裏面側に配置するとともに、前記偏光板と反射板の
いずれかと前記液晶セルとの間に前記位相板を配置して
なり、かつ、前記位相板の遅相軸と前記液晶セルの液晶
分子配向方向とを互いにほぼ平行にするかあるいはほぼ
直交させ、前記偏光板の透過軸を前記位相板の遅相軸に
対して所定角度斜めにずらしたものであるから、カラー
フィルタを用いずに透過光を着色して光の透過率を高く
し、表示の明るさを十分高くすることができる。The color liquid crystal display device of the present invention includes a liquid crystal cell in which a liquid crystal is sealed between a pair of transparent substrates having transparent electrodes and the molecules of which are homogeneously aligned, one phase plate, and one phase plate. A polarizing plate and a reflecting plate are provided, the polarizing plate is arranged on the front surface side of the liquid crystal cell, the reflecting plate is arranged on the back surface side of the liquid crystal cell, and either the polarizing plate or the reflecting plate and the liquid crystal are arranged. The phase plate is arranged between the cell and the slow axis of the phase plate and the liquid crystal molecule alignment direction of the liquid crystal cell are substantially parallel or substantially orthogonal to each other, and the transmission of the polarizing plate is performed. Since the axis is slanted by a predetermined angle with respect to the slow axis of the phase plate, the transmitted light is colored to increase the light transmittance without using a color filter, and the brightness of the display is sufficiently high. can do.
【図１】本発明の第１の実施例によるカラー液晶表示装
置の断面図。FIG. 1 is a sectional view of a color liquid crystal display device according to a first embodiment of the present invention.
【図２】本発明の第１の実施例による液晶セルの液晶分
子配向方向と位相板の遅相軸と偏光板の透過軸とを示す
平面図。FIG. 2 is a plan view showing an alignment direction of liquid crystal molecules of a liquid crystal cell, a slow axis of a phase plate, and a transmission axis of a polarizing plate according to a first embodiment of the present invention.
【図３】本発明の第１の実施例によるカラー液晶表示装
置のＣＩＥ色度図。FIG. 3 is a CIE chromaticity diagram of the color liquid crystal display device according to the first embodiment of the present invention.
【図４】本発明の第２の実施例による液晶セルの液晶分
子配向方向と位相板の遅相軸と偏光板の透過軸とを示す
平面図。FIG. 4 is a plan view showing an alignment direction of liquid crystal molecules of a liquid crystal cell, a slow axis of a phase plate, and a transmission axis of a polarizing plate according to a second embodiment of the present invention.
【図５】従来のカラー液晶表示装置の断面図。FIG. 5 is a sectional view of a conventional color liquid crystal display device.
３０…液晶セル ３１，３２…透明基板 ３０ａ…液晶分子配向方向（ホモジニアス配向方向） ３３，３４…透明電極 ３５，３６…配向膜 ３８…液晶 ３８ａ…液晶分子 ４０…位相板 ４０ａ…遅相軸 ４１…偏光板 ４１ａ…透過軸 ４２…反射板 30 ... Liquid crystal cell 31, 32 ... Transparent substrate 30a ... Liquid crystal molecule alignment direction (homogeneous alignment direction) 33, 34 ... Transparent electrode 35, 36 ... Alignment film 38 ... Liquid crystal 38a ... Liquid crystal molecule 40 ... Phase plate 40a ... Slow axis 41 ... Polarizing plate 41a ... Transmission axis 42 ... Reflecting plate
Claims (2)
晶を封入しその分子をホモジニアス配向させた液晶セル
と、１枚の位相板と、１枚の偏光板と、反射板とを備
え、前記偏光板を前記液晶セルの表面側に配置し、前記
反射板を前記液晶セルの裏面側に配置するとともに、前
記偏光板と反射板のいずれかと前記液晶セルとの間に前
記位相板を配置してなり、かつ、前記位相板の遅相軸と
前記液晶セルの液晶分子配向方向とを互いにほぼ平行に
するかあるいはほぼ直交させ、前記偏光板の透過軸を前
記位相板の遅相軸に対して所定角度斜めにずらしたこと
を特徴とするカラー液晶表示装置。1. A liquid crystal cell in which liquid crystal is sealed between a pair of transparent substrates having transparent electrodes and whose molecules are homogeneously aligned, one phase plate, one polarizing plate, and a reflecting plate. , The polarizing plate is arranged on the front surface side of the liquid crystal cell, the reflecting plate is arranged on the rear surface side of the liquid crystal cell, and the phase plate is provided between any one of the polarizing plate and the reflecting plate and the liquid crystal cell. And the slow axis of the phase plate and the alignment direction of liquid crystal molecules of the liquid crystal cell are substantially parallel or substantially orthogonal to each other, and the transmission axis of the polarizing plate is the slow axis of the phase plate. A color liquid crystal display device, which is slanted at a predetermined angle with respect to the above.
角は４５±５°であることを特徴とする請求項１に記載
のカラー液晶表示装置。2. The color liquid crystal display device according to claim 1, wherein the deviation angle between the transmission axis of the polarizing plate and the slow axis of the phase plate is 45 ± 5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09266993A JP3289391B2 (en) | 1993-04-20 | 1993-04-20 | Color liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09266993A JP3289391B2 (en) | 1993-04-20 | 1993-04-20 | Color liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06308482A true JPH06308482A (en) | 1994-11-04 |
| JP3289391B2 JP3289391B2 (en) | 2002-06-04 |
Family
ID=14060890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09266993A Expired - Lifetime JP3289391B2 (en) | 1993-04-20 | 1993-04-20 | Color liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3289391B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721600A (en) * | 1995-10-06 | 1998-02-24 | Nec Corporation | Reflective liquid crystal display with optical compensation plates |
| KR100734233B1 (en) * | 2000-12-20 | 2007-07-02 | 엘지.필립스 엘시디 주식회사 | color liquid crystal display |
-
1993
- 1993-04-20 JP JP09266993A patent/JP3289391B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721600A (en) * | 1995-10-06 | 1998-02-24 | Nec Corporation | Reflective liquid crystal display with optical compensation plates |
| KR100734233B1 (en) * | 2000-12-20 | 2007-07-02 | 엘지.필립스 엘시디 주식회사 | color liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3289391B2 (en) | 2002-06-04 |
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