JP3180482B2 - Color liquid crystal display - Google Patents
Color liquid crystal displayInfo
- Publication number
- JP3180482B2 JP3180482B2 JP35142892A JP35142892A JP3180482B2 JP 3180482 B2 JP3180482 B2 JP 3180482B2 JP 35142892 A JP35142892 A JP 35142892A JP 35142892 A JP35142892 A JP 35142892A JP 3180482 B2 JP3180482 B2 JP 3180482B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal cell
- color
- δnd
- 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.)
- Expired - Fee Related
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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- 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
- G02F2202/00—Materials and properties
- G02F2202/40—Materials having a particular birefringence, retardation
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/34—Colour display without the use of colour mosaic filters
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/02—Number of plates being 2
Description
【０００１】[0001]
【産業上の利用分野】この発明は、複屈折効果を利用す
るツイステッドネマティック型のカラー液晶表示装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twisted nematic type color liquid crystal display device utilizing a birefringence effect.
【０００２】[0002]
【従来の技術】従来、パーソナルコンピュータなどのＯ
Ａ機器に用いられるカラー液晶表示装置では、カラーフ
ィルタが用いられている。ところが、カラーフイルタは
高価で且つ光利用率が著しく低いという大きな欠点を有
している。また、画素数が白黒表示のものの３倍になる
ので、精密な加工技術が要求される。カラーフィルタを
用いないマルチカラー液晶表示装置として、複屈折制御
（ＥＣＢ）効果型の液晶表示装置などが知られている。
このようなカラーフィルタを用いないカラー液晶表示装
置では、階調電圧（例えば、８階調の電圧）を画素に印
加すると、印加された階調電圧に応じて液晶分子の配向
が変化し、これに伴って液晶セルの有効なΔｎｄが変化
し、その結果、液晶の複屈折効果によって液晶セルのΔ
ｎｄの変化に応じた薄い色がつく。2. Description of the Related Art Conventionally, an O such as a personal computer has been used.
A color filter is used in a color liquid crystal display device used for the A-device. However, color filters have the major drawbacks of being expensive and having extremely low light utilization. Further, since the number of pixels is three times that of a monochrome display, a precise processing technique is required. As a multi-color liquid crystal display device without using a color filter, a birefringence control (ECB) effect type liquid crystal display device and the like are known.
In a color liquid crystal display device that does not use such a color filter, when a gradation voltage (for example, a voltage of 8 gradations) is applied to a pixel, the orientation of liquid crystal molecules changes according to the applied gradation voltage. , The effective Δnd of the liquid crystal cell changes, and as a result, the ΔΔ of the liquid crystal cell changes due to the birefringence effect of the liquid crystal.
A light color is obtained according to the change of nd.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述の
カラーフィルタを用いない従来のカラー液晶表示装置で
は、赤、緑、青の色特性つまり明度や彩度が悪く、８階
調電圧のもとでも、緑青、青紫、赤、黄の４色しか区別
することができないという問題がある。この発明は、上
記事情に鑑みてなされたもので、その目的とするところ
は、カラーフィルタを用いずに色特性が良好なマルチカ
ラー表示を実現できるカラー液晶表示装置を提供するこ
とである。However, in the conventional color liquid crystal display device which does not use the above-described color filter, the red, green and blue color characteristics, that is, lightness and chroma are poor, and even under an 8-gradation voltage. , Blue-green, blue-violet, red, and yellow. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a color liquid crystal display device capable of realizing a multi-color display with good color characteristics without using a color filter.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、この発明のカラー液晶表示装置は、液晶分子をツイ
スト配向させた複屈折効果型の液晶セルと、この液晶セ
ルの外側に配置された一対の偏光板と、前記一対の偏光
板間に配置された位相板とを備え、前記液晶セルの複屈
折効果の着色作用によりカラー表示を行うカラー液晶表
示装置であって、前記液晶セルの屈折率異方性Δｎとギ
ャップｄとの積Δｎｄが１０００〜２０００ｎｍの範囲
で、前記位相板の配置枚数をＮ枚とすれば、この位相板
の屈折率異方性ΔｎLと厚さｄLとの積ΔｎLｄLがΔｎｄ
×ｒ×(１／Ｎ)で、この場合の係数ｒが０．７０〜０．
９５を満足するようにしたことを特徴とする。 In order to achieve the above object, a color liquid crystal display device according to the present invention comprises a liquid crystal molecule having a twisted shape.
A liquid crystal cell of a birefringence effect type with a strike alignment, a pair of polarizing plates disposed outside the liquid crystal cell, and a phase plate disposed between the pair of polarizing plates ;
Color liquid crystal display for color display by the coloring effect of the folding effect
A liquid crystal cell having a refractive index anisotropy Δn and a gap d having a product Δnd in the range of 1000 to 2000 nm, and the number of the phase plates being N; The product of the anisotropy Δn L and the thickness d L Δn L d L is Δnd
× r × (1 / N), and the coefficient r in this case is 0.70-0.
95 is satisfied .
【０００５】[0005]
【作用】この発明によれば、液晶分子をツイスト配向さ
せた複屈折効果型の液晶セルのΔｎｄを１０００〜２０
００ｎｍの範囲に設定し、この液晶セルの外側に配置さ
れた一対の偏光板間にＮ枚の位相板を配置するととも
に、各位相板のΔｎLｄLを、係数ｒを０．７０〜０．９
５としたとき、Δｎｄ×ｒ×(１／Ｎ)に設定したので、
多階調の電圧印加時における液晶セルの複屈折による着
色効果がＮ枚の位相板の複屈折効果で強調され、これに
より赤、緑、青の色特性が向上する。According to the present invention, the liquid crystal molecules are twisted.
Δnd of the birefringent effect type liquid crystal cell is 1000 to 20
00 nm, N phase plates are disposed between a pair of polarizing plates disposed outside the liquid crystal cell, Δn L d L of each phase plate, and a coefficient r is set to 0.70 to 0. .9
When it was set to 5, since it was set to Δnd × r × (1 / N),
The coloring effect due to the birefringence of the liquid crystal cell when applying a voltage of multiple gradations is emphasized by the birefringence effect of the N phase plates, whereby the color characteristics of red, green and blue are improved.
【０００６】[0006]
【実施例】以下、図１〜図４を参照して、この発明の第
１実施例を説明する。図１は透過型のカラー液晶表示装
置の断面を示す。この図において、液晶セル１は、一方
の電極２およびこの電極２を覆う配向膜３が形成された
一方の基板４と、前記一方の電極２と交差して対向する
他方の電極５およびこの他方の電極５を覆う配向膜６が
形成された他方の基板７と、これら各基板４、７を所定
間隔を隔てて接合するシール材８と、これら各基板４、
７とシール材８とに囲まれた領域に封入されて液晶分子
が１８０〜３６０°の範囲でツイスト配向された液晶材
料９とからなっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross section of a transmission type color liquid crystal display device. In this figure, a liquid crystal cell 1 includes one substrate 2 on which one electrode 2 and an alignment film 3 covering the electrode 2 are formed, another electrode 5 which intersects and opposes the one electrode 2, and the other. The other substrate 7 on which the alignment film 6 covering the electrode 5 is formed, the sealing material 8 for joining these substrates 4 and 7 at a predetermined interval, and the substrates 4 and 7
The liquid crystal material 9 is sealed in a region surrounded by the seal material 7 and the seal material 8 and has liquid crystal molecules twist-aligned in a range of 180 to 360 °.
【０００７】ところで、色特性に優れたマルチカラー液
晶表示装置を実現するには、階調電圧の印加時における
赤、緑、青の色変化をなるべく大きくする必要がある
が、その為には液晶セルのΔｎｄと液晶分子のツイスト
角をともに最適化する必要がある。その一般的な液晶セ
ルの条件について、図２〜図４を参照して説明する。図
２は、ツイスト角が２１０°でΔｎｄが４００〜２００
０ｎｍの間で１００ｎｍ毎に異なる１７種類の各液晶セ
ルの表示色を示すＣＩＥ色度図である。この図２によれ
ば、液晶セルのΔｎｄは１５００〜２０００ｎｍが白色
を示し好適である。図３は、ツイスト角が２１０°の液
晶セルにおいて、（１／２００）デューティで８段階の
階調電圧を印加したときの液晶セルのΔｎｄと表示色の
変化との関係を示すＣＩＥ色度図である。この図におい
て、黒三角（▲）は液晶セルのΔｎｄが９００ｎｍ、プ
ラス（＋）は液晶セルのΔｎｄが１２００ｎｍ、黒菱
（◆）は液晶セルのΔｎｄが１４００ｎｍ、白菱（◇）
は液晶セルのΔｎｄが１６００ｎｍをそれぞれ表わして
いる。この図３によれば、液晶セルのΔｎｄが１４００
ｎｍと１６００ｎｍとの場合がよい多色に変化してい
る。図４は、Δｎｄが１４００ｎｍの液晶セルにおい
て、（１／２００）デューティで８段階の階調電圧を印
加したときの液晶分子のツイスト角と表示色の変化との
関係を示すＣＩＥ色度図である。この図において、ワイ
（Ｙ）はツイスト角が２１０°、プラス（＋）はツイス
ト角が２２５°、白菱（◇）はツイスト角が２４０°、
黒三角（▲）はツイスト角が２５５°をそれぞれ表わし
ている。この図４によれば、２１０゜、２２５゜、２４
０゜のツイスト角でほぼ同程度の色変化が得られている
が、その内でも２４０゜の場合が最も多色に変化してい
る。図２乃至図４から、液晶分子のツイスト角は２１０
〜２４０°程度に設定されていることが望ましい。ま
た、液晶セル１の屈折率異方性Δｎとギャップｄとの積
Δｎｄは、１０００〜２０００ｎｍ（測定波長：５８９
ｎｍ）の範囲で、好ましくは１４００〜２０００ｎｍに
設定するのがよい。なお、この液晶セル１は図面上で下
方から光が入射して上方へ出射する。By the way, in order to realize a multi-color liquid crystal display device having excellent color characteristics, it is necessary to make the color change of red, green and blue upon application of a gradation voltage as large as possible. It is necessary to optimize both the Δnd of the cell and the twist angle of the liquid crystal molecules. The general conditions of the liquid crystal cell will be described with reference to FIGS. FIG. 2 shows that the twist angle is 210 ° and Δnd is 400 to 200.
FIG. 9 is a CIE chromaticity diagram showing display colors of 17 types of liquid crystal cells that are different every 100 nm between 0 nm. According to FIG. 2, the Δnd of the liquid crystal cell is preferably 1500 to 2000 nm, which is white. FIG. 3 is a CIE chromaticity diagram showing a relationship between Δnd of a liquid crystal cell and a change in display color when eight gradation voltages are applied at (1/200) duty in a liquid crystal cell having a twist angle of 210 °. It is. In this figure, a black triangle (▲) indicates that the Δnd of the liquid crystal cell is 900 nm, a plus (+) indicates that the Δnd of the liquid crystal cell is 1200 nm, a black diamond (◆) indicates that the Δnd of the liquid crystal cell is 1400 nm, and a white diamond (菱)
Indicates that the Δnd of the liquid crystal cell is 1600 nm. According to FIG. 3, Δnd of the liquid crystal cell is 1400
In the case of nm and 1600 nm, the color changes to good multicolor. FIG. 4 is a CIE chromaticity diagram showing a relationship between a twist angle of liquid crystal molecules and a change in display color when a gradation voltage of eight stages is applied at (1/200) duty in a liquid crystal cell having Δnd of 1400 nm. is there. In this figure, the twist angle is 210 ° for the Y (Y), the twist angle is 225 ° for the plus (+), the twist angle is 240 ° for the white diamond (◇),
A black triangle (▲) indicates that the twist angle is 255 °. According to FIG. 4, 210 °, 225 °, 24
Almost the same color change is obtained at a twist angle of 0 °, but among them, the case of 240 ° has the most multicolor change. 2 to 4, the twist angle of the liquid crystal molecules is 210
It is desirable that the angle is set to about 240 °. The product Δnd of the refractive index anisotropy Δn of the liquid crystal cell 1 and the gap d is 1000 to 2000 nm (measuring wavelength: 589).
nm), preferably 1400 to 2000 nm. In the liquid crystal cell 1, light enters from below and exits upward in the drawing.
【０００８】液晶セル１の光入射側の基板４の外側に
は、直線偏光板からなる偏光子１０が配置されている。
また、光出射側の基板７の外側には、直線偏光板からな
る検光子１１が配置されている。そして、液晶セル１の
一方の基板４と偏光子１０との間、および液晶セル１の
上基板７と検光子１１との間には、それぞれ１枚ずつ合
計２枚の位相板１２が配置されている。各位相板１２
は、それぞれポリカーボネートからなっている。ポリカ
ーボネートは、構造式のなかにベンゼン環をもっている
ので、Δｎに顕著な波長依存性がみられる。そして、各
位相板１２のΔｎｄは、位相板１２の枚数をＮ枚（この
実施例では２枚）としたとき、Δｎｄ×ｒ×（１／Ｎ）
に設定する。但し、係数ｒは０．７〜０．９５の範囲で
ある。従って、本例の場合、Δｎｄの設定範囲は３５０
〜９５０ｎｍとなり、その内でも４９０〜９５０ｎｍの
範囲が好ましい。A polarizer 10 composed of a linear polarizer is disposed outside the substrate 4 on the light incident side of the liquid crystal cell 1.
Further, an analyzer 11 made of a linear polarizing plate is arranged outside the substrate 7 on the light emission side. A total of two phase plates 12 are arranged between the one substrate 4 of the liquid crystal cell 1 and the polarizer 10 and between the upper substrate 7 of the liquid crystal cell 1 and the analyzer 11, respectively. ing. Each phase plate 12
Are made of polycarbonate. Since polycarbonate has a benzene ring in its structural formula, Δn has a remarkable wavelength dependence. The Δnd of each phase plate 12 is Δnd × r × (1 / N) when the number of the phase plates 12 is N (two in this embodiment).
Set to. However, the coefficient r is in the range of 0.7 to 0.95. Therefore, in the case of this example, the setting range of Δnd is 350
To 950 nm, and among them, the range of 490 to 950 nm is preferable.
【０００９】なお、この液晶セル１は、（１／４００）
〜（１／４８０）デューティ、（１／１３）〜（１／１
５）バイアスで電圧駆動されている。また、各階調はフ
レームレートコントロール法により制御され、マルチカ
ラー表示が実現されている。The liquid crystal cell 1 has a (1/400)
To (1/480) duty, (1/13) to (1/1)
5) Voltage driven by bias. Further, each gradation is controlled by a frame rate control method to realize a multi-color display.
【００１０】このような透過型のカラー液晶表示装置で
は、液晶セル１が階調電圧によって駆動されると、印加
された階調電圧に応じて液晶分子の配向が変化し、この
変化に伴って液晶セル１の有効なΔｎｄが変化する。そ
の結果、液晶セル１を透過する光が液晶セル１の複屈折
効果によって液晶セル１の有効Δｎｄの変化に応じた色
に着色され、この着色効果が２枚の位相板１２の複屈折
効果で強調されるので、赤、緑、青の色特性つまり明度
や彩度が向上し、従来のものよりも色数の多いマルチカ
ラーが実現される。In such a transmission type color liquid crystal display device, when the liquid crystal cell 1 is driven by a gray scale voltage, the orientation of liquid crystal molecules changes according to the applied gray scale voltage. The effective Δnd of the liquid crystal cell 1 changes. As a result, the light transmitted through the liquid crystal cell 1 is colored by the birefringence effect of the liquid crystal cell 1 into a color corresponding to the change in the effective Δnd of the liquid crystal cell 1, and this coloring effect is caused by the birefringence effect of the two phase plates 12. Since the emphasis is made, the color characteristics of red, green, and blue, that is, lightness and saturation are improved, and a multi-color having more colors than the conventional one is realized.
【００１１】次に、図５を参照して、この発明の第２実
施例を説明する。なお、図１の第１実施例と同一部分に
は同一符号を付し、その説明は省略する。図５は反射型
のカラー液晶表示装置の断面を示す。このカラー液晶表
示装置は、第１実施例と同じ液晶セル１の両側に直線偏
光板からなる偏光板２０、２０がそれぞれ配置されてい
るとともに、液晶セル１の一方側の基板４と偏光板２０
との間、および液晶セル１の他方側の基板７と偏光板２
０との間にそれぞれ位相板２１が配置され、かつ他方側
の偏光板２０の外側に反射板２２が配置された構造にな
っている。この場合にも、液晶セル１の屈折率異方性Δ
ｎとギャップｄとの積（Δｎｄ）STNは１０００〜２０
００ｎｍで好ましくは１４００〜２０００ｎｍの範囲に
設定する。また、各位相板２１は、第１実施例と同様、
ポリカーボネートからなり、各位相板１２の（Δｎｄ）
LAMは、定数ｒを０．７０〜０．９５の範囲としたと
き、（Δｎｄ）STN×ｒ×（１／Ｎ）に設定されてい
る。そして、このカラー液晶表示装置は、図面上で上方
から入射した光が反射板２２で反射されて上方へ出射す
るようになっている。また、この液晶セル１も、透過型
の場合と同様に（１／４００）〜（１／４８０）デュー
ティ、（１／１３）〜（１／１５）バイアスで電圧駆動
され、フレームコントロール法により階調制御されてい
る。Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 5 shows a cross section of a reflective type color liquid crystal display device. In this color liquid crystal display device, polarizing plates 20 and 20 each composed of a linear polarizing plate are arranged on both sides of the same liquid crystal cell 1 as in the first embodiment, respectively.
And the substrate 7 on the other side of the liquid crystal cell 1 and the polarizing plate 2
A phase plate 21 is disposed between the polarizers 20 and 0, and a reflection plate 22 is disposed outside the polarizing plate 20 on the other side. Also in this case, the refractive index anisotropy Δ
The product of n and gap d (Δnd) STN is 1000 to 20
The thickness is set to 00 nm, preferably in the range of 1400 to 2000 nm. Further, each phase plate 21 is similar to the first embodiment.
(Δnd) of each phase plate 12 made of polycarbonate
The LAM is set to (Δnd) STN × r × (1 / N) when the constant r is in the range of 0.70 to 0.95. In the color liquid crystal display device, light incident from above in the drawing is reflected by the reflection plate 22 and emitted upward. This liquid crystal cell 1 is also voltage-driven with a duty ratio of (1/400) to (1/480) and a bias of (1/13) to (1/15) as in the case of the transmissive type. The key is controlled.
【００１２】このような反射型のカラー液晶表示装置に
おいても、印加された階調電圧に応じて液晶分子の配向
が変化し、この変化に伴って液晶セル１の有効なΔｎｄ
が変化するので、液晶セル１を透過する光が液晶セル１
の複屈折によって液晶セル１の有効なΔｎｄの変化に応
じた色に着色され、この着色効果が２枚の位相板２１の
複屈折効果で強調されるので、赤、緑、青の色特性が向
上し、色数の多いマルチカラーが実現される。Also in such a reflection type color liquid crystal display device, the orientation of the liquid crystal molecules changes according to the applied gradation voltage, and the effective Δnd of the liquid crystal cell 1 is changed with this change.
Changes, the light transmitted through the liquid crystal cell 1
Is colored in accordance with the change in the effective Δnd of the liquid crystal cell 1, and this coloring effect is enhanced by the birefringence effect of the two phase plates 21, so that the color characteristics of red, green, and blue are Improved, multi-color with many colors is realized.
【００１３】なお、上述した各実施例では、位相板にポ
リカーボネートを用いたが、これに限らず、ポリビニル
アルコールを保護膜（三酢酸セルロース）で挾んだもの
を用いてもよい。このような位相板では、構造上ベンゼ
ン環をもたないのでΔｎにほとんど波長依存性はみられ
ないが、ポリカーボネイトの位相板とは異なった効果が
ある。In each of the embodiments described above, polycarbonate is used for the phase plate. However, the present invention is not limited to this, and a material in which polyvinyl alcohol is sandwiched between protective films (cellulose triacetate) may be used. Since such a phase plate does not have a benzene ring in its structure, Δn hardly has a wavelength dependence, but has an effect different from that of a polycarbonate phase plate.
【００１４】また、位相板の配置構成は上記実施例の構
成に限らず、液晶セルの両側に合計で３枚以上配置して
もよく、また液晶セルの片側に複数枚の位相板を配置し
てもよい。The arrangement of the phase plates is not limited to the configuration of the above embodiment. A total of three or more phase plates may be arranged on both sides of the liquid crystal cell, or a plurality of phase plates may be arranged on one side of the liquid crystal cell. You may.
【００１５】[0015]
【発明の効果】以上説明したように、この発明によれ
ば、Δｎｄが１０００〜２０００ｎｍの範囲の液晶分子
をツイスト配向させた複屈折効果型の液晶セルを挟んで
その配置された一対の偏光板間にＮ枚の位相板を配置
し、位相板のΔｎLｄLが、係数ｒを０．７０〜０．９５
としたとき、Δｎｄ×ｒ×(１／Ｎ)を満足するように設
定したので、多階調の電圧印加時における液晶セルの複
屈折による着色効果をＮ枚の位相板の複屈折効果で強調
し、これにより赤、緑、青の色特性を改善することがで
きる。As described above, according to the present invention, liquid crystal molecules having Δnd in the range of 1000 to 2000 nm are provided.
N phase plates are arranged between a pair of polarizing plates disposed with a birefringent effect type liquid crystal cell having a twist orientation in between, and Δn L d L of the phase plate has a coefficient r of 0.70 to 0.70. 0.95
Is set so as to satisfy Δnd × r × (1 / N), so that the coloring effect due to the birefringence of the liquid crystal cell when a voltage of multiple gradations is applied is emphasized by the birefringence effect of the N phase plates. Thus, the color characteristics of red, green, and blue can be improved.
【図１】この発明の第１実施例である透過型のカラー液
晶表示装置の断面図。FIG. 1 is a sectional view of a transmission type color liquid crystal display device according to a first embodiment of the present invention.
【図２】図１の液晶セルにおいて、ツイスト角が２１０
°の液晶セルのΔｎｄと表示色との関係を示したＣＩＥ
色度図。FIG. 2 shows a twist angle of 210 in the liquid crystal cell of FIG.
CIE showing the relationship between Δnd and display color of liquid crystal cell in °
Chromaticity diagram.
【図３】図１の液晶セルにおいて、８段階の階調電圧を
印加したときのツイスト角が２１０゜の液晶セルのΔｎ
ｄと表示色との関係を示したＣＩＥ色度図。FIG. 3 shows Δn of a liquid crystal cell having a twist angle of 210 ° when eight gradation voltages are applied in the liquid crystal cell of FIG. 1;
FIG. 5 is a CIE chromaticity diagram showing a relationship between d and a display color.
【図４】図１の液晶セルにおいて、Δｎｄが１４００ｎ
ｍの液晶セルの８段階の階調電圧を印加したときの液晶
分子のツイスト角と表示色との関係を示したＣＩＥ色度
図。FIG. 4 shows the liquid crystal cell of FIG.
FIG. 8 is a CIE chromaticity diagram showing the relationship between the twist angle of liquid crystal molecules and the display color when eight gradation voltages are applied to a liquid crystal cell of m.
【図５】この発明の第２実施例である反射型のカラー液
晶表示装置の断面図。FIG. 5 is a sectional view of a reflective color liquid crystal display device according to a second embodiment of the present invention.
１ 液晶セル ９ 液晶材料 １０ 偏光子 １１ 検光子 １２、２１ 位相板 ２０ 偏光板 ２２ 反射板 DESCRIPTION OF SYMBOLS 1 Liquid crystal cell 9 Liquid crystal material 10 Polarizer 11 Analyzer 12, 21 Phase plate 20 Polarizer 22 Reflector
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−141630（ＪＰ，Ａ) 特開 平３−226713（ＪＰ，Ａ) 特開 平３−132720（ＪＰ，Ａ) 特開 平４−101119（ＪＰ，Ａ) 特開 平３−105311（ＪＰ，Ａ) 特開 平３−15022（ＪＰ，Ａ) 特開 平３−163584（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02F 1/1335 G02F 1/133 500 G02F 1/139 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-141630 (JP, A) JP-A-3-226713 (JP, A) JP-A-3-132720 (JP, A) JP-A-4- 101119 (JP, A) JP-A-3-105531 (JP, A) JP-A-3-15022 (JP, A) JP-A-3-163584 (JP, A) (58) Fields investigated (Int. 7, DB name) G02F 1/1335 G02F 1/133 500 G02F 1/139
Claims (2)
型の液晶セルと、この液晶セルの外側に配置された一対
の偏光板と、前記一対の偏光板間に配置された位相板と
を備え、前記液晶セルの複屈折効果によって透過光を着
色することによりカラー表示を行うカラー液晶表示装置
であって、 前記液晶セルの屈折率異方性Δｎとギャップｄとの積Δ
ｎｄが１０００〜２０００ｎｍの範囲で、前記位相板の
配置枚数をＮ枚とすれば、この位相板の屈折率異方性Δ
ｎLと厚さｄLとの積ΔｎLｄLがΔｎｄ×ｒ×(１／Ｎ)
で、この場合の係数ｒが０．７０〜０．９５の範囲であ
ることを特徴とするカラー液晶表示装置。1. A liquid crystal cell of a birefringence effect type in which liquid crystal molecules are twisted, a pair of polarizing plates disposed outside the liquid crystal cell, and a phase plate disposed between the pair of polarizing plates. To transmit light by the birefringence effect of the liquid crystal cell.
Color liquid crystal display device that performs color display by color
A is the product of the refractive index anisotropy Δn and the gap d of the liquid crystal cell Δ
If nd is in the range of 1000 to 2000 nm and the number of the phase plates is N, the refractive index anisotropy Δ
The product of n L and thickness d L Δn L d L is Δnd × r × (1 / N)
The coefficient r in this case is in the range of 0.70 to 0.95.
ち一方の偏光板の外側に反射板を配置したことを特徴と
するカラー液晶表示装置。2. A color liquid crystal display device according to claim 1, wherein a reflector is disposed outside one of the pair of polarizers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35142892A JP3180482B2 (en) | 1992-12-08 | 1992-12-08 | Color liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35142892A JP3180482B2 (en) | 1992-12-08 | 1992-12-08 | Color liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06175125A JPH06175125A (en) | 1994-06-24 |
| JP3180482B2 true JP3180482B2 (en) | 2001-06-25 |
Family
ID=18417221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35142892A Expired - Fee Related JP3180482B2 (en) | 1992-12-08 | 1992-12-08 | Color liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3180482B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128381C (en) * | 1994-10-26 | 2003-11-19 | 精工爱普生株式会社 | Liquid crystal device and electronic appliance by using same |
| KR100397652B1 (en) * | 1995-01-23 | 2003-11-28 | 아사히 가라스 가부시키가이샤 | Color liquid crystal display apparatus |
| JP3284169B2 (en) * | 1995-10-13 | 2002-05-20 | シャープ株式会社 | Birefringence control type liquid crystal display |
| JP3292809B2 (en) * | 1996-09-25 | 2002-06-17 | 松下電器産業株式会社 | Color liquid crystal display device |
| JP3339334B2 (en) | 1996-12-05 | 2002-10-28 | 松下電器産業株式会社 | Reflective liquid crystal display |
| JP3210274B2 (en) | 1997-08-25 | 2001-09-17 | 松下電器産業株式会社 | Reflective liquid crystal display |
| JP3172706B2 (en) | 1998-04-17 | 2001-06-04 | 松下電器産業株式会社 | Reflective liquid crystal display |
| TW522273B (en) | 1998-08-07 | 2003-03-01 | Matsushita Electric Ind Co Ltd | Reflection type liquid crystal display element |
| JP2000066195A (en) | 1998-08-24 | 2000-03-03 | Matsushita Electric Ind Co Ltd | Reflection type liquid crystal display device |
| JP2001013500A (en) | 1999-06-30 | 2001-01-19 | Matsushita Electric Ind Co Ltd | Reflection type liquid crystal display element |
| JP4871526B2 (en) | 2004-05-14 | 2012-02-08 | キヤノン株式会社 | Color display element and driving method of color display element |
-
1992
- 1992-12-08 JP JP35142892A patent/JP3180482B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06175125A (en) | 1994-06-24 |
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