JP2001056463A - Liquid crystal display device - Google Patents

Liquid crystal display device

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Publication number
JP2001056463A
JP2001056463A JP11234032A JP23403299A JP2001056463A JP 2001056463 A JP2001056463 A JP 2001056463A JP 11234032 A JP11234032 A JP 11234032A JP 23403299 A JP23403299 A JP 23403299A JP 2001056463 A JP2001056463 A JP 2001056463A
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liquid crystal
layer
light
color
display device
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JP11234032A
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Japanese (ja)
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Satoshi Ikeda
悟志 池田
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Casio Comput Co Ltd
カシオ計算機株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a reflection type liquid crystal display device capable of light display of white and display of a color image having excellent color quality.
SOLUTION: This liquid crystal display device has a pair of front and rear substrates 1 and 2 opposed to each other interposing a liquid crystal layer 10. And a polarizing plate 11 is disposed in front of the front substrate 1 and a reflection plate 14 is disposed in the rear of the rear substrate 2. And color filters 7R, 7G and 7B of three color of red, green and blue corresponding to plural picture elements are provided between the liquid crystal layer 10 and the reflection plate 14 and a polarized light reflecting layer 8 which reflects incident light of a component of polarized light along a reflection axis and transmits incident light of a component of polarized light along a transmission axis is provided between the color filter 7R, 7G and 7B and the liquid crystal 10.
COPYRIGHT: (C)2001,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】この発明は、カラー画像を表示する液晶表示装置に関するものである。 TECHNICAL FIELD The present invention relates to a liquid crystal display device for displaying a color image.

【0002】 [0002]

【従来の技術】液晶表示装置には、TN(ツイステッド・ネマティック)型液晶表示装置、STN(スーパー・ BACKGROUND OF THE INVENTION a liquid crystal display device, TN (twisted nematic) type liquid crystal display device, STN (super
ツイステッド・ネマティック)型液晶表示装置、強誘電性液晶または反強誘電性液晶を用いた強誘電性液晶表示装置などがある。 Twisted nematic) type liquid crystal display device, and the like ferroelectric liquid crystal display device using a ferroelectric liquid crystal or anti-ferroelectric liquid crystal.

【0003】これらの液晶表示装置は、液晶層をはさんで対向する前後一対の基板のそれぞれの内面に、互いに対向する領域により複数の画素領域を形成する電極が設けられ、前記一対のうちの前基板の前面と、後基板の背後とに、それぞれ偏光板が配置された構成となっている。 [0003] These liquid crystal display devices, each of the inner surfaces of the pair of substrates before and after facing across the liquid crystal layer, an electrode to form a plurality of pixel regions is provided by a region facing each other, of the pair and the front surface of the front substrate, on the back of the rear substrate, polarizing plates is in the deployed configuration.

【0004】前記液晶表示装置には、白黒画像を表示するものと、フルカラー画像等の多色カラー画像を表示するものとがあり、カラー画像を表示する液晶表示装置は、従来、いずれか一方の基板(一般には前基板)の内面に、前記複数の画素領域にそれぞれ対応する複数の色の着色層、例えば赤、緑、青またはイエロー、マゼンタ、シアンの3色のカラーフィルタを設けて構成されている。 [0004] The liquid crystal display device, as to display a black and white image, while others of displaying multi-color images, such as a full-color image, a liquid crystal display device for displaying a color image, conventionally, one or the inner surface of the substrate (typically before the substrate), a plurality of color colored layers corresponding to the plurality of pixel areas, for example, red, green, blue or yellow, magenta, is formed by providing a color filter of three colors of cyan ing.

【0005】また、前記液晶表示装置には、バックライトを備え、このバックライトからの照明光を利用して表示する透過型のものと、自然光や室内光等の外光を利用して表示する反射型のものとがあり、反射型の液晶表示装置は、従来、その背後(後側偏光板の背面)に反射板を配置して構成されている。 [0005] wherein the liquid crystal display device, a backlight, and a transmission type to be displayed using illumination light from the backlight, displays utilizing the external light such as natural light or room light while others of the reflection type, the reflection type liquid crystal display device is conventionally formed by arranging a reflector behind (rear surface of the rear-side polarizing plate).

【0006】 [0006]

【発明が解決しようとする課題】しかし、従来のカラー画像を表示する反射型液晶表示装置は、複数の画素領域からそれぞれ、前記着色層の色に着色した着色光(赤、 [SUMMARY OF THE INVENTION] However, the reflective type liquid crystal display device for displaying the conventional color image, each of a plurality of pixel areas, colored light colored to the color of the colored layer (red,
緑、青またはイエロー、マゼンタ、シアンの3色の着色光)を出射させ、これらの着色光の混色により白を含む様々な色を表示するものであるため、白の表示が暗く、 Green, blue or yellow, magenta, to emit the three colors of colored light) of cyan, because the display of white is dark as they display a variety of colors including white by color mixing of these colored light,
また表示画像の色質が悪いという問題をもっている。 Also has a problem of poor color quality of the displayed image.

【0007】すなわち、従来の反射型液晶表示装置は、 Namely, the conventional reflection type liquid crystal display device,
その背後に反射板を配置した構成であり、前方から入射した外光が、前側偏光板と着色層および液晶層と後側偏光板とを順に透過して前記反射板により反射され、その反射光が、前記後側偏光板と液晶層および着色層と前側偏光板とを順に透過して前方に出射する。 A configuration of arranging the reflector behind, external light incident from the front is reflected by the reflecting plate and the front polarizing plate color layer and the liquid crystal layer and the rear polarizing plate transmits through the order, the reflected light but it is emitted forward through the said rear polarizing plate and the liquid crystal layer and coloring layer and the front polarizing plate in this order.

【0008】そのため、従来の反射型液晶表示装置は、 [0008] Therefore, the conventional reflection type liquid crystal display device,
その各画素領域から出射する光が常に着色光であり、この着色光は、前記着色層によりその吸収波長帯域の波長成分の光を吸収されてその着色層の色に着色した、強度を大きく減じた光である。 As is always colored light is light emitted from each pixel region, the colored light, the absorbed light having a wavelength component of the absorption wavelength band by the colored layer colored in the color of the colored layer reduces the strength significantly It was a light.

【0009】そして、例えば前記着色層として赤、緑、 [0009] Then, for example, red as the colored layer, green,
青の3色のカラーフィルタを備えた液晶表示装置の場合、従来は、隣り合う3つの画素領域からそれぞれ出射する赤、緑、青の3色の光の加法混色により白を表示しているが、これらの赤、緑、青の出射光は、いずれも前記カラーフィルタでの吸収により強度を大きく減じた光であるため、表示される白は、暗い表示である。 For the liquid crystal display device provided with color filters of three colors of blue, conventionally, red emitted from each of the three pixels adjacent areas, green, displaying the white by additive color mixing of three colors of blue light these red, green, light emitted blue because both are light obtained by subtracting the intensity increases by absorption in the color filter, white display is dark display.

【0010】しかも、従来の液晶表示装置は、複数の色の着色光の混色により白を表示するものであるため、前記複数の色の着色光の出射強度をそれぞれ、帯色の無い良好な白が得られるように調整する必要があり、そのためには、前記複数の色の着色層の吸収特性および層厚を、白の表示を優先させて設定しなければならない。 [0010] Moreover, the conventional liquid crystal display device, since it is intended to display white by mixing of a plurality of colors of colored light, wherein the plurality of the emission intensity of the colored light of the color respectively, no good white with strip colors It must be adjusted so as to obtain, for this, the absorption and thickness of the plurality of colors of color layers, must be set by giving priority to the display of white.

【0011】そのため、従来の液晶表示装置は、各画素領域から出射する各色の着色光の色純度を全て高くすることが難しく、したがって、色質の良いカラー画像が得られない。 [0011] Therefore, the conventional liquid crystal display device, it is difficult to increase all the color purity of each color of the colored light emitted from each pixel region, therefore, it is not obtained a good color image with color quality.

【0012】この発明は、白の表示が明るく、また色質の良いカラー画像を表示することができる反射型の液晶表示装置を提供することを目的としたものである。 [0012] This invention is aimed at displaying the white bright, also provides a reflective liquid crystal display device capable of displaying a good color image with color quality.

【0013】 [0013]

【課題を解決するための手段】この発明の液晶表示装置は、液晶層をはさんで対向する前後一対の基板のそれぞれの内面に、互いに対向する領域により複数の画素領域を形成する電極が設けられ、前記一対の基板のうちの前基板の前面に偏光板が配置され、後基板の背後に反射手段が配置されるとともに、前記液晶層と前記反射手段との間に、前記複数の画素領域にそれぞれ対応する複数の色の着色層が設けられ、これらの着色層と前記液晶層との間に、互いにほぼ直交する方向に反射軸と透過軸とをもち、前記反射軸に沿った偏光成分の入射光を反射し、 Means for Solving the Problems] The liquid crystal display device of the present invention, each of the inner surfaces of the pair of substrates before and after facing across the liquid crystal layer, provided with electrodes forming a plurality of pixel regions by a region facing each other is, the polarizing plate in front of the front substrate of the pair of substrates are disposed, together with the reflecting means behind the rear substrate are disposed, between the liquid crystal layer and said reflecting means, said plurality of pixel areas corresponding colored layer of a plurality of colors are provided for, between the and the coloring layer liquid crystal layer has a transmission axis and the reflection axis in a direction substantially perpendicular to each other, polarized light component along the reflector axis It reflects the incident light,
前記透過軸に沿った偏光成分の入射光を透過させる偏光反射層が設けられていることを特徴とするものである。 It is characterized in that the polarized reflection layer that transmits incident light of the polarized component along the transmission axis is provided.

【0014】この発明の液晶表示装置は、上記のような構成であるため、前方から入射し、前記偏光板と液晶層とを透過した光が、前記偏光反射層に入射し、その光のうちの前記偏光反射層の反射軸に沿った偏光成分の光が、この偏光反射層により反射され、前記液晶層および偏光板を透過して前方に出射する。 [0014] The liquid crystal display device of the present invention, since a configuration as described above, incident from the front, light transmitted through said polarizing plate and the liquid crystal layer is incident on the polarized light reflecting layer, of the light optical polarization component along the reflection axis of the polarizing reflective layer is reflected by the polarized light reflecting layer to be emitted forward through the liquid crystal layer and the polarizing plate.

【0015】前記偏光反射層により反射されて前方に出射する光は、前記偏光反射層が前記液晶層と着色層との間に設けられているため、前記着色層による吸収を受けないので、高強度の白色光である。 The light emitted to the front is reflected by the polarization reflecting layer, since the polarized light reflecting layer is provided between the liquid crystal layer and the coloring layer, does not undergo absorption by the colored layer, high strength is a white light.

【0016】また、前方から入射し、前記偏光板と液晶層とを透過して前記偏光反射層に入射した光のうち、前記偏光反射層の透過軸に沿った偏光成分の光は、この偏光反射層を透過して前記着色層に入射し、この着色層によりその吸収波長帯域の波長成分の光を吸収されて着色光となり、その着色光が前記反射手段により反射され、 Further, incident from the front, the passes through the polarizing plate and the liquid crystal layer of the light incident on the polarized light reflecting layer, the light of the polarized component along the transmission axis of the polarizing reflective layer, the polarization passes through the reflective layer is incident on the colored layer, the colored layer is absorbed the light having a wavelength component of the absorption wavelength band becomes colored light, the colored light is reflected by said reflecting means,
前記着色層と前記偏光反射層と液晶層および偏光板とを順に透過して前方に出射する。 Emitted forward through the said colored layer and the reflective polarizer layer and the liquid crystal layer and the polarizing plate in this order.

【0017】すなわち、この液晶表示装置は、前方から入射した光を前記偏光反射層により反射して白を表示し、前記偏光反射層を透過し前記着色層を透過して着色した光を前記反射手段により反射して前記着色層の色を表示するものであり、各画素領域から出射する白色光と着色光との比率は、前記偏光板と液晶層とを透過して前記偏光反射層に入射する光の偏光状態に応じて変化する。 [0017] That is, the liquid crystal display device, a white display the light incident from the front is reflected by the polarizing reflective layer, transmitted through the light colored passes through reflecting the colored layer the polarizing reflective layer is intended to display a color of the colored layer is reflected by means the ratio between the white light and colored light emitted from each pixel region is incident on the polarized light reflecting layer passes through the said polarizing plate and the liquid crystal layer It varies according to the polarization state of light.

【0018】つまり、前方から入射した光は、前記偏光板によりその吸収軸に沿った振動成分の光を吸収されて直線偏光となり、その光が前記液晶層を透過する過程で液晶分子の配向状態に応じた複屈折作用を受けるため、 [0018] That is, light incident from the front, the orientation state of the absorbed light of a vibration component along the absorption axis thereof by the polarizing plate becomes linearly polarized light, the liquid crystal molecules in the course of the light is transmitted through the liquid crystal layer for receiving a birefringence effect corresponding to,
前記液晶分子の配向状態に応じて前記偏光反射層に入射する光の偏光状態が変化し、それによって各画素領域から出射する白色光と着色光との比率が変化する。 The liquid crystal molecules polarization state of light incident on the polarized light reflecting layer is changed according to the orientation of it by the ratio changes between the white light and colored light emitted from each pixel region.

【0019】したがって、各画素領域の電極間に印加する電圧を制御し、液晶分子の配向状態を変化させて各画素領域から出射する白色光と着色光との比率を制御することにより、各画素領域の表示を、白表示と着色表示とに変化させるとともに、前記白色光と着色光との比率によって決まる着色表示の色の濃さと明るさを制御し、各画素領域からの出射光の混色によりカラー画像を表示することができる。 [0019] Thus, by controlling the voltage applied between the electrodes of each pixel region, controlling the ratio between the white light and colored light by changing the alignment state of the liquid crystal molecules is emitted from each pixel region, each pixel the display area, along with changing to the white display and color display, controls the white light and darkness and brightness of the color display color determined by the ratio of the colored light, by mixing the light emitted from each pixel region color image can be displayed.

【0020】このように、この発明の液晶表示装置は、 [0020] In this way, the liquid crystal display device of the present invention,
前方から入射した光を前記偏光反射層により反射して白を表示するものであり、前記偏光反射層により反射されて前方に出射する光は、前記着色層による吸収を全く受けない高強度の白色光であるため、明るい白を表示することができる。 Are those of the light incident from the front is reflected by the polarizing reflective layer displays white, light emitted forward is reflected by the polarization reflecting layer, a white high strength receives no absorption by the coloring layer because it is light, it is possible to display a bright white.

【0021】しかも、この液晶表示装置は、前方から入射した光を前記偏光反射層により反射して白を表示するものであるため、複数の色の着色光の混色により白を表示する従来の液晶表示装置のように、前記複数の色の着色光の出射強度をそれぞれ帯色の無い良好な白が得られるように調整する必要はなく、したがって、複数の色の着色層の吸収特性および層厚をそれぞれ色純度の高い着色光が得られるように設定し、色質の良いカラー画像を表示することができる。 [0021] Moreover, the liquid crystal display device, is to display the white light incident from the front is reflected by the polarized light reflecting layer, the conventional liquid crystal displays white by color mixing of a plurality of colors of colored light as the display device, the plurality of no need to adjust the emission intensity of the colored light of the color for good white without each band colors is obtained, therefore, the absorption characteristics and thickness of the plurality of color of the colored layer each set to high color light color purity is obtained, it is possible to display a good color image with color quality.

【0022】 [0022]

【発明の実施の形態】この発明の液晶表示装置は、上記のように、液晶層をはさんで対向する前後一対の基板のうちの前基板の前面に偏光板を配置し、後基板の背後に反射手段を配置するとともに、前記液晶層と前記反射手段との間に、複数の画素領域にそれぞれ対応する複数の色の着色層を設け、これらの着色層と前記液晶層との間に、反射軸に沿った偏光成分の入射光を反射し、透過軸に沿った偏光成分の入射光を透過させる偏光反射層を設けることにより、反射型のものであっても、白の表示が明るく、また色質の良いカラー画像を表示することができるようにしたものである。 DETAILED DESCRIPTION OF THE INVENTION A liquid crystal display device of this invention, as described above, the polarizer is arranged in front of the front substrate of the pair of substrates before and after facing across the liquid crystal layer, behind the rear substrate with arranging the reflecting means, between said reflecting means and said liquid crystal layer, a colored layer of a plurality of colors corresponding to a plurality of pixel regions is provided, between the and the coloring layer liquid crystal layer, the incident light polarization component along the reflection axis is reflected, by providing a polarizing reflective layer that transmits incident light of the polarized component along the transmission axis, also be of a reflective type, the display of the white bright, Further it is obtained to be able to display a good color image with color quality.

【0023】この発明の液晶表示装置において、前記複数の色の着色層は、前記液晶層と前記反射手段との間であれば、前記後基板の内面側と背面側のいずれに設けてもよく、また、前記偏光反射層は、前記着色層と前記液晶層との間であれば、前記後基板の内面側と背面側のいずれに設けてもよい。 [0023] In the liquid crystal display device of the present invention, the plurality of colors colored layers, if between the reflection means and the liquid crystal layer may be provided on either the back side the inner surface side of the rear substrate in addition, the polarizing reflective layer, if between the colored layer and the liquid crystal layer may be provided either on the back side the inner surface side of the rear substrate.

【0024】すなわち、例えば、前記偏光反射層と着色層の両方を後基板の内面側に設ける場合は、前記後基板の内面に前記着色層を設け、この着色層の上に前記偏光反射層を設ければよい。 [0024] That is, for example, the case of providing both of the polarized light reflecting layer and the coloring layer on the inner surface of the rear substrate, the colored layer provided on the inner surface of the rear substrate, said polarized light reflecting layer on top of the colored layer it may be provided. また、前記偏光反射層と着色層の両方を後基板の背面側に設ける場合は、前記後基板の背面に前記偏光反射層を設け、この偏光反射層の背面に前記着色層を設ければよく、いずれの構成としても、白の表示が明るく、また色質の良いカラー画像を表示することができる。 Also, in the case of providing both of the polarized light reflecting layer and the colored layer on the back side of the rear substrate, said polarized light reflecting layer provided on the back surface of the rear substrate, may be provided the colored layer on the back of the polarized light reflecting layer , as either configuration, it is possible to display the white bright, also displays a good color image with color quality.

【0025】さらに、前記複数の色の着色層は、赤、 [0025] In addition, the plurality of color colored layers of red,
緑、青またはイエロー、マゼンタ、シアンの3色のカラーフィルタが好ましく、この3色のカラーフィルタを備えることにより、フルカラー画像等の多色カラー画像を表示することができる。 Green, blue or yellow, magenta, and three color filters of cyan Preferably, by providing a color filter of three colors, it is possible to display a multi-color image such as a full color image.

【0026】 [0026]

【実施例】図1〜図3はこの発明の第1の実施例を示しており、図1は液晶表示装置のハッチングを省略した断面図である。 Embodiment] FIGS shows a first embodiment of the present invention, FIG. 1 is a sectional view, hatching of the liquid crystal display device.

【0027】この液晶表示装置は、液晶層10をはさんで対向する前後一対の透明基板1,2のそれぞれの内面に、互いに対向する領域により複数の画素領域を形成する透明な電極4,6が設けられ、前記一対の基板1,2 [0027] The liquid crystal display device, the liquid crystal layer 10 in interposed at respective inner surfaces of the pair of transparent substrates 1 and 2 before and after the opposing transparent electrodes 4, 6 to form a plurality of pixel regions by a region facing each other is provided, said pair of substrates 1 and 2
のうちの前基板1の前面に偏光板11が配置され、後基板2の背後に反射手段として反射板14が配置されるとともに、前記液晶層10と前記反射板14との間に、前記複数の画素領域にそれぞれ対応する複数の色の着色層、例えば赤、緑、青のカラーフィルタ7R,7G,7 Polarizer 11 is disposed on the front surface of the front substrate 1 of, in conjunction with reflector 14 is arranged as a reflecting means behind the rear substrate 2, between the liquid crystal layer 10 and the reflective plate 14, a plurality a plurality of color colored layers corresponding respectively to the pixel region, for example, red, green, and blue color filters 7R of, 7G, 7
Bが設けられ、これらのカラーフィルタ7R,7G,7 B are provided, these color filters 7R, 7G, 7
Bと前記液晶層10との間に、偏光反射層8が設けられた構成となっている。 Between the liquid crystal layer 10 is B, and has a configuration in which the polarization reflective layer 8 is provided.

【0028】なお、前記偏光板11は、一般にニュートラル偏光板と称される無着色偏光板であり、前記反射板14は、アルミニウムまたは銀等の金属膜、あるいはチタン酸バリウム等の白色膜からなる無着色反射板である。 [0028] Incidentally, the polarizing plate 11 is generally a non-colored polarizers termed neutral polarizer, the reflection plate 14, a white film of a metal film such as aluminum or silver or barium titanate, etc. it is a non-colored reflective plate.

【0029】また、この実施例の液晶表示装置は、単純マトリックス方式のものであり、一方の基板、例えば前基板1の内面に設けられた電極4は、行方向(画面の左右方向)に沿わせて互いに平行に形成された複数の走査電極、他方の基板である後基板2の内面に設けられた電極6は、列方向(画面の上下方向)に沿わせて互いに平行に形成された複数の信号電極である。 Further, the liquid crystal display device of this embodiment is of a simple matrix system, along the one of the substrates, the electrodes 4 provided before the inner surface of the substrate 1, for example, a row direction (horizontal direction of the screen) a plurality of scan electrodes formed in parallel to each other Te Align, electrodes 6 provided on the inner surface of the substrate 2 after an other substrate, a plurality which are parallel to each other along a column direction (vertical direction of the screen) a signal electrode.

【0030】この実施例では、前記カラーフィルタ7 [0030] In this embodiment, the color filter 7
R,7G,7Bを後基板2の内面に設け、このカラーフィルタ7R,7G,7Bの上に前記偏光反射層8を設けるとともに、前記偏光反射層8の上に、前記信号電極6 R, 7G, provided on the inner surface of the rear substrate 2 and 7B, the color filter 7R, 7G, provided with the polarizing reflective layer 8 on the 7B, on the polarized light reflecting layer 8, the signal electrode 6
を設けている。 A is provided.

【0031】図3は前記偏光反射層8の斜視図である。 [0031] FIG. 3 is a perspective view of the polarizing reflective layer 8.
この偏光反射層8は、互いにほぼ直交する方向に反射軸8sと透過軸8pとをもっており、前記反射軸8sに沿った偏光成分の入射光を反射し、前記透過軸8pに沿った偏光成分の入射光を透過させる特性を有している。 The polarized light reflecting layer 8, has a transmission axis 8p and the reflection axis 8s in a direction substantially perpendicular to each other, and reflect incident light of the polarized component along the reflection axis 8s, polarized light component along the transmission axis 8p It has the property of transmitting the incident light.

【0032】すなわち、図3に示したように、前記偏光反射層8に、その反射軸8sに沿った偏光成分(以下、 [0032] That is, as shown in FIG. 3, the polarization reflective layer 8, the polarization component (hereinafter along its reflection axis 8s,
S偏光成分という)の光sと、前記透過軸8pに沿った偏光成分(以下、P偏光成分という)の光pとの両方を含む光を入射させると、その入射光のうちの前記反射軸8sに沿ったS偏光成分の光sは偏光反射層8で反射され、前記透過軸8pに沿ったP偏光成分の光pは偏光反射層8を透過する。 S and light s) of that polarization component, the transmission axis 8p polarization component (hereinafter along, when light is incident containing both light p of P that polarized light component), the reflection axis of the incident light light s of S-polarized light component along the 8s is reflected by the polarized light reflecting layer 8, the light p of the P-polarized component along the transmission axis 8p is transmitted through the polarization reflection layer 8. なお、図3には、偏光反射層8にその前面側から光を入射させた例を示したが、前記偏光反射層8は、その背面側からの入射光に対しても同じ特性を示す。 Incidentally, in FIG. 3, there is shown an example in which light is incident from the front side to the polarized light reflecting layer 8, the polarization reflecting layer 8 also shows the same characteristics with respect to incident light from the back side thereof.

【0033】前記偏光反射層8は、一般に偏光反射板と呼ばれる光学フィルムと同じ構成のものであり、例えば、後基板2の内面に設けられた前記カラーフィルタ7 [0033] The polarized light reflecting layer 8 is generally of the same configuration as the optical film called polarizing reflection plate, for example, the color filter 7 provided on the inner surface of the rear substrate 2
R,7G,7Bの上に前記光学フィルムを貼り付けて形成されている。 R, 7G, and is formed by pasting the optical film onto 7B. なお、この偏光反射層8は、波長依存性の無い反射特性および透過特性を有しており、その反射光は鏡面反射光である。 Incidentally, the polarization reflecting layer 8 has a reflection and transmission properties with no wavelength dependence, the reflected light is specularly reflected light.

【0034】さらに、前記一対の基板1,2の内面にはそれぞれ、前記電極4,6を覆って配向膜5,9が形成されており、これらの配向膜5,9は、その膜面を所定の方向にラビングすることにより配向処理されている。 Furthermore, each of the inner surfaces of the pair of substrates 1 and 2 is formed with an alignment film (5,9) to cover the electrodes 4, 6, these alignment films 5 and 9, the film surface It is alignment treatment by rubbing in a predetermined direction.

【0035】そして、前記一対の基板1,2は、枠状のシール材3を介して接合されており、これらの基板1, [0035] Then, the pair of substrates 1, 2 are joined via the frame-shaped sealing member 3, the substrates 1,
2間の前記シール材3で囲まれた領域に液晶が充填されて液晶層10が形成されている。 The sealing material 3 crystal in a region surrounded by the filled liquid crystal layer 10 between the two is formed.

【0036】また、この実施例の液晶表示装置は、ST Further, the liquid crystal display device of this embodiment, ST
N型のものであり、前記液晶層10の液晶分子は、前記一対の基板1,2の内面に設けられた配向膜5,9によりそれぞれの基板1,2の近傍における配向方向を規制され、一対の基板1,2間において180°〜270° Is of N-type, liquid crystal molecules of the liquid crystal layer 10 is regulated the alignment direction in the vicinity of each of the substrates 1 by the orientation films 5,9 provided on the inner surface of the pair of substrates 1 and 2, 180 ° to 270 ° in between the pair of substrates 1 and 2
の範囲のツイスト角、例えば220°〜240°のツイスト角でツイスト配向している。 Twist angle in the range of, are twisted at a twist angle of, for example, 220 ° to 240 °.

【0037】なお、このSTN型の液晶表示装置は、液晶分子のツイスト角が大きいため、電極4,6間への電圧の印加による液晶分子の配向状態の変化に対する光の透過率の変化が急峻であり、したがって、液晶分子のツイスト角がほぼ90°であるTN型のものに比べて高デューティでの時分割駆動が可能であるが、その反面、表示に帯色を生じるため、この実施例では、前基板1の前面に配置された偏光板11と前記前基板1との間に、帯色補償用の位相差板12を設けている。 [0037] Incidentally, this STN liquid crystal display device, for the twist angle of the liquid crystal molecules is large, abrupt change in transmittance of light with respect to a change in orientation of the liquid crystal molecules by applying voltage between electrodes 4 and 6 , and the thus, because although the twist angle of the liquid crystal molecules is possible time-division driving at high duty as compared with the TN type is approximately 90 °, resulting the other hand, the band color display, this embodiment in front between the polarizing plate 11 disposed on the front surface of the substrate 1 and the front substrate 1 is provided with a phase difference plate 12 for band color compensation.

【0038】この位相差板12は、前記液晶層10のΔ [0038] The retardation plate 12, the liquid crystal layer 10 delta
nd(液晶の複屈折性Δnと液晶層厚dとの積)に応じて設定されたリタデーションを有しており、前記偏光板11と前記位相差板12と前記偏光反射層8のそれぞれ光学軸の向きは、前記液晶層10の液晶分子の配向状態と、前記液晶層10のΔndおよび位相差板12のリタデーションの値に応じて、表示の帯色を無くすように設定されている。 nd has a set retardation depending on (the product of the birefringence Δn and the liquid crystal layer thickness d of the liquid crystal), each optical axis of the polarizer 11 and the retardation plate 12 and the polarized reflection layer 8 the orientation of the alignment state of the liquid crystal molecules of the liquid crystal layer 10, in accordance with the retardation values ​​Δnd and the retarder 12 of the liquid crystal layer 10 is set to eliminate the band color display.

【0039】図2は、前記液晶層10の液晶分子の配向状態を、220°〜240°のツイスト角のツイスト配向とし、前記液晶層10のΔndを300〜700n [0039] Figure 2, the alignment state of the liquid crystal molecules of the liquid crystal layer 10, the twisted orientation of the twist angle of 220 ° ~240 °, 300~700n the Δnd of the liquid crystal layer 10
m、前記位相差板12のリタデーションを300〜70 m, the retardation of the retardation plate 12 300-70
0nmに設定したときの、前記液晶分子の配向状態と、 When set to 0 nm, the alignment state of the liquid crystal molecules,
前記偏光板11の吸収軸11aと、前記位相差板12の遅相軸12aと、前記偏光反射層8の反射軸8sおよび透過軸8pの向きを示している。 Shows the absorption axis 11a of the polarizer 11, the slow axis 12a of the retardation plate 12, the direction of the reflection axis 8s and the transmission axis 8p of the polarizing reflective layer 8.

【0040】図2のように、この実施例では、前基板1 [0040] As in FIG. 2, in this embodiment, the front substrate 1
の近傍における液晶分子配向方向1aを、画面の横軸x The liquid crystal molecular alignment direction 1a in the vicinity of the horizontal axis x of the screen
に対して前面(液晶表示装置の前面)側から見て右回りに20°〜30°ずれた方向、後基板2の近傍における液晶分子配向方向2aを、前記横軸xに対して前面側から見て左回りに20°〜30°ずれた方向に設定しており、したがって、液晶層10の液晶分子は、そのツイスト方向を図に破線矢印で示したように、後基板2から前基板1に向かい、前面側から見て右回りに220°〜2 To the front face (the liquid crystal display device front) 20 ° clockwise as viewed from the side to 30 ° shifted direction, the liquid crystal molecular alignment direction 2a in the vicinity of the rear substrate 2, from the front side with respect to the horizontal axis x look is set to 20 ° to 30 ° shifted direction counterclockwise, the thus, the liquid crystal molecules of the liquid crystal layer 10, the twist direction as indicated by broken line arrows in the figure, before the substrate from the rear substrate 2 1 across the street, 220 ° clockwise when viewed from the front side to 2
40°のツイスト角でツイスト配向している。 It has been twisted in the twist angle of 40 °.

【0041】そして、前記偏光板11は、その吸収軸1 [0041] Then, the polarizer 11, the absorption axis 1
1aを前記横軸xに対して前面側から見て左回りにほぼ5°〜15°ずれた方向に向けて配置されており、前記位相差板12は、その遅相軸12aを前記横軸xに対して前面側から見て左回りに40°〜50°ずれた方向に向けて配置されている。 1a is disposed toward substantially 5 ° to 15 ° shifted direction counterclockwise as viewed from the front side with respect to the horizontal axis x, the phase difference plate 12, the horizontal axis the slow axis 12a is arranged toward the 40 ° to 50 ° shifted direction counterclockwise as viewed from the front side with respect to x. すなわち、前記偏光板11の吸収軸11aは、前記前基板1の近傍における液晶分子配向方向1aに対し、前面側から見て左回りに25°〜4 That is, the absorption axis 11a of the polarizer 11, to the liquid crystal molecular alignment direction 1a in the vicinity of the front substrate 1, 25 ° counterclockwise when viewed from the front side to 4
5°ずれており、前記位相差板12の遅相軸12aは、 5 ° deviation and the slow axis 12a of the retardation plate 12,
前記偏光板11の吸収軸11aに対し、前面側から見て左回りに35°〜45°ずれている。 The relative absorption axis 11a of the polarizer 11 are offset 35 ° to 45 ° counterclockwise as viewed from the front side.

【0042】また、前記偏光反射層8は、その反射軸8 Further, the polarizing reflective layer 8, the reflection axis 8
sを前記横軸xに対して前面側から見て左回りに70° 70 ° counterclockwise when viewed from the front side of s with respect to the horizontal axis x
〜80°ずれた方向に向けて設けられている。 Provided towards to 80 ° shifted direction. すなわち、この偏光反射層8の反射軸8sは、前記後基板2の近傍における液晶分子配向方向2aに対し、前面側から見て左回りにほぼ50°ずれており、前記反射軸8sとほぼ直交する透過軸8pは、前記後基板2の近傍における液晶分子配向方向2aに対し、前面側から見て右回りにほぼ20°ずれている。 In other words, the reflection axis 8s of the polarized light reflecting layer 8, to the liquid crystal molecular alignment direction 2a in the vicinity of the rear substrate 2 are offset approximately 50 ° counterclockwise when viewed from the front side, substantially perpendicular to the reflection axis 8s transmission axis 8p to the to the liquid crystal molecular alignment direction 2a in the vicinity of the rear substrate 2, are offset approximately 20 ° clockwise as viewed from the front side.

【0043】さらに、この実施例では、前記偏光反射層8による反射光(鏡面反射光)を広範囲に拡散させて出射するため、前記偏光板11と前記前基板1との間に、 [0043] Further, in this embodiment, since the emitted widely diffuses the reflected light (specular reflection light) by the polarization reflecting layer 8, between the front substrate 1 and the polarizer 11,
光拡散層13を設けている。 It is provided with a light diffusing layer 13.

【0044】なお、図1では、前記光拡散層13を、前記位相差板12の背面側(位相差板12と前基板1との間)に設けているが、この光拡散層13は、前記位相差板12の前面側(位相差板12と偏光板11との間)に設けてもよい。 [0044] In FIG. 1, the light diffusion layer 13, are provided on the back side of the retardation plate 12 (between the phase difference plate 12 and the front substrate 1), the light diffusion layer 13, it may be provided on the front side of the retardation plate 12 (between the phase difference plate 12 and a polarizer 11).

【0045】この液晶表示装置は、上記のような構成であるため、前方から入射し、前記偏光板11と位相差板12と液晶層10とを透過した光が、前記偏光反射層8 [0045] The liquid crystal display device are the configuration as described above, incident from the front, the polarizer 11 and the retardation plate 12 and the light transmitted through the liquid crystal layer 10 is, the polarizing reflective layer 8
に入射し、その光のうちの前記偏光反射層8の反射軸8 Incident on the reflection axis 8 of the polarizing reflective layer 8 of the light
sに沿った偏光成分の光(図3におけるS偏光成分の光s)が、この偏光反射層8により反射され、前記液晶層10および位相差板12と偏光板11を透過して前方に出射する。 Light of polarization component along the s (light s of S-polarized component in FIG. 3) is reflected by the polarized light reflecting layer 8, emitted forward through the liquid crystal layer 10 and the retarder 12 and the polarizer 11 to.

【0046】前記偏光反射層8により反射されて前方に出射する光は、前記偏光反射層8が前記液晶層10とカラーフィルタ7R,7G,7Bとの間に設けられているため、前記カラーフィルタ7R,7G,7Bによる吸収を全く受けない非着色光、つまり高強度の白色光である。 The light emitted to the front is reflected by the polarization reflecting layer 8, since the polarized reflection layer 8 is provided between the liquid crystal layer 10 and the color filter 7R, 7G, and 7B, the color filter 7R, 7G, uncolored light which receive no absorption by 7B, that is, white light of high intensity.

【0047】なお、前方から入射した光は、前記偏光板11によりその吸収軸11aに沿った振動成分の光を吸収されて直線偏光となり、その光が前記位相差板12の複屈折作用により偏光状態を変えるとともに、前記液晶層10を透過する過程で液晶分子の配向状態に応じた複屈折作用を受け、その光が前記偏光反射層8に入射して、その光のうちの前記偏光反射層8の反射軸8sに沿った偏光成分の光が、この偏光反射層8により反射される。 [0047] Incidentally, the light incident from the front, the absorbed light of a vibration component along the absorption axis 11a by the polarizing plate 11 to become a linearly polarized light, the polarization the light has a birefringence effect of the retardation plate 12 with changes state, the receiving birefringence effect in accordance with the alignment state of the liquid crystal molecules in the process of passing through the liquid crystal layer 10, the light is incident on the polarized light reflecting layer 8, the polarization reflecting layer of the light light of polarization component along the reflection axis 8s 8 is reflected by the polarized light reflecting layer 8.

【0048】そして、前記偏光反射層8により反射された光は、前記液晶層10および位相差板12を再び透過して前記偏光板11に入射し、その光のうちの前記偏光板11の吸収軸11aに沿った偏光成分の光がこの偏光板11により吸収され、前記偏光板11の透過した光が前方に出射する。 [0048] Then, the light reflected by the polarization reflection layer 8 is again transmitted through the liquid crystal layer 10 and the retarder 12 is incident on the polarizer 11, the absorption of the polarizing plate 11 of the light light of polarization component along the axis 11a is absorbed by the polarizer 11, the transmitted light of the polarizer 11 is emitted forward.

【0049】したがって、前記偏光反射層8により反射されて前方に出射する白色光の強度は、前記偏光板11 [0049] Thus, the intensity of the white light emitted forward is reflected by the polarizing reflective layer 8, the polarizer 11
と位相差板12液晶層10とを透過して前記偏光反射層8に入射する光の偏光状態に応じて変化する。 And changes according to the polarization state of light incident on the polarized light reflecting layer 8 passes through the retardation plate 12 liquid crystal layer 10.

【0050】また、前方から入射し、前記偏光板11と位相差板12と液晶層10とを透過して前記偏光反射層8に入射した光のうち、前記偏光反射層8の透過軸8p [0050] Moreover, incident from the front, of the light incident on the polarized light reflecting layer 8 is transmitted through said polarizing plate 11 and the retardation plate 12 and the liquid crystal layer 10, transmission axes 8p of the polarizing reflective layer 8
に沿った偏光成分の光(図3におけるP偏光成分の光p)は、この偏光反射層8を透過して前記カラーフィルタ7R,7G,7Bに入射し、このカラーフィルタ7 Light of polarization component (light p of the P-polarized component in FIG. 3) along the incident and transmitted through the polarized light reflecting layer 8 the color filter 7R, 7G, in 7B, the color filter 7
R,7G,7Bによりその吸収波長帯域の波長成分の光を吸収されて着色光となり、その着色光が前記反射板1 R, 7G, the absorbed light having a wavelength component in the absorption wavelength band becomes colored light by 7B, the colored light is the reflection plate 1
4により反射され、前記カラーフィルタ7R,7G,7 4 is reflected by the color filter 7R, 7G, 7
Bと前記偏光反射層8と液晶層10および位相差板12 B and the polarization reflective layer 8 and the liquid crystal layer 10 and the retarder 12
と偏光板11とを順に透過して前方に出射する。 And emitted to the front passes through a polarizing plate 11 in order.

【0051】この着色光は、前方から入射した光のうち、前記偏光反射層8を透過し、前記カラーフィルタ7 [0051] The colored light, of the light incident from the front, passes through the polarizing reflective layer 8, the color filter 7
R,7G,7Bによりその吸収波長帯域の波長成分の光を吸収されて着色した光であり、したがって、前方に出射する着色光の強度も、前記偏光板11と位相差板12 R, 7G, 7B is light colored are absorbing light having a wavelength component of the absorption wavelength band by, therefore, the strength of the colored light emitted forward, the polarizer 11 and the retardation plate 12
液晶層10とを透過して前記偏光反射層8に入射する光の偏光状態に応じて変化する。 Passes through the liquid crystal layer 10 varies according to the polarization state of light incident on the polarized light reflecting layer 8.

【0052】すなわち、この液晶表示装置は、前方から入射した光を前記偏光反射層8により反射して白を表示し、前記偏光反射層8を透過し前記カラーフィルタ7 [0052] That is, the liquid crystal display device, white to display the reflected light incident from the front by the reflective polarizer layer 8, it is transmitted through the polarization reflecting layer 8 the color filter 7
R,7G,7Bを透過して着色した光を前記反射板14 R, 7G, light colored transmitted through 7B the reflection plate 14
により反射して前記カラーフィルタ7R,7G,7Bの色を表示するものであり、各画素領域から出射する白色光と着色光との比率は、前記偏光板11と位相差板12 Is intended to display the reflected color filters 7R, 7G, the color 7B, the ratio between the white light and colored light emitted from each pixel region, the polarizer 11 and the retardation plate 12
液晶層10とを透過して前記偏光反射層8に入射する光の偏光状態に応じて変化する。 Passes through the liquid crystal layer 10 varies according to the polarization state of light incident on the polarized light reflecting layer 8.

【0053】つまり、前方から入射した光は、上述したように、前記偏光板11によりその吸収軸11aに沿った振動成分の光を吸収されて直線偏光となり、その光が前記位相差板12の複屈折作用により偏光状態を変えるとともに、前記液晶層10を透過する過程で液晶分子の配向状態に応じた複屈折作用を受けるため、前記液晶分子の配向状態に応じて前記偏光反射層8に入射する光の偏光状態が変化し、それによって各画素領域から出射する白色光と着色光との比率が変化する。 [0053] That is, light incident from the front, as described above, the absorbed light of a vibration component along the absorption axis 11a by the polarizing plate 11 to become a linearly polarized light, the light of the retardation plate 12 with changing the polarization state by birefringence effect, for receiving a birefringence effect corresponding to the alignment state of the liquid crystal molecules in the process of passing through the liquid crystal layer 10, incident on the polarized light reflecting layer 8 in accordance with the alignment state of the liquid crystal molecules polarization state changes of the light, thereby changing the ratio between the white light and colored light emitted from each pixel region.

【0054】したがって、各画素領域の電極4,6間に印加する電圧を制御し、液晶分子の配向状態を変化させて各画素領域から出射する白色光と着色光との比率を制御することにより、各画素領域の表示を、白表示と着色表示とに変化させるとともに、前記白色光と着色光との比率によって決まる着色表示の色の濃さと明るさを制御し、各画素領域からの出射光の混色によりカラー画像を表示することができる。 [0054] Thus, by controlling the voltage applied between the electrodes 4, 6 of each pixel region, controlling the ratio between the white light and colored light by changing the alignment state of the liquid crystal molecules is emitted from each pixel region the display of each pixel region, with changing the white display color display and controls the density and brightness of the color display color determined by the ratio between the white light and colored light, light emitted from each pixel region it is possible to display a color image by color mixing.

【0055】なお、この実施例では、前記液晶層10の液晶分子の配向状態と、前記偏光板11の吸収軸11a [0055] In this embodiment, the alignment state of the liquid crystal molecules of the liquid crystal layer 10, the absorption axis 11a of the polarizer 11
と、前記位相差板12の遅相軸12aと、前記偏光反射層8の反射軸8sおよび透過軸8pの向きを図2に示したように設定しているため、前記電極4,6間に液晶分子が基板1,2面に対して最も倒伏した初期のツイスト配向状態に配向するオフ電圧を印加したときに、その画素領域の表示が白になり、前記電極4,6間に液晶分子が基板1,2面に対してほぼ垂直に立上がり配向するオン電圧を印加したときに、その画素領域の表示が前記カラーフィルタ7R,7G,7Bの色になる。 When the slow axis 12a of the retardation plate 12, the direction of the reflection axis 8s and the transmission axis 8p of the polarizing reflective layer 8 because it is set as shown in FIG. 2, between the electrodes 4, 6 when the liquid crystal molecules are applied the off-voltage to orient the most lodging the initial twist alignment state with respect to 1 surface substrate, it displays the pixel area in the white, the liquid crystal molecules between the electrodes 4, 6 upon application of the oN voltage oriented rising substantially perpendicular to the substrate 1 surface, the display of the pixel area color filters 7R, 7G, become the color of 7B.

【0056】また、この実施例の液晶表示装置は、複数の色の着色層として、赤、緑、青の3色のカラーフィルタ7R,7G,7Bを備えているため、各画素領域からそれぞれ出射する赤、緑、青の光の濃さと明るさを制御することにより、フルカラー画像等の多色カラー画像を表示することができる。 [0056] The liquid crystal display device of this embodiment, as a colored layer of a plurality of colors, red, green, due to the provision of color filters 7R three colors blue, 7G, the 7B, respectively emitted from each pixel region to red, green, by controlling the density and brightness of the light of the blue, it is possible to display the multi-color image, such as a full-color image.

【0057】このように、上記液晶表示装置は、前方から入射した光を前記偏光反射層8により反射して白を表示するものであり、前記偏光反射層8により反射されて前方に出射する光は、前記カラーフィルタ7R,7G, [0057] Thus, the liquid crystal display device is to display white by reflecting light incident from the front by the reflective polarizer layer 8, the light emitted forward is reflected by the polarization reflecting layer 8 , the color filters 7R, 7G,
7Bによる吸収を全く受けない高強度の白色光であるため、明るい白を表示することができる。 Since 7B is a high intensity white light which does not receive any absorption by, you can display a bright white.

【0058】しかも、この液晶表示装置は、前方から入射した光を前記偏光反射層8により反射して白を表示するものであるため、複数の色の着色光の混色により白を表示する従来の液晶表示装置のように、前記複数の色の着色光の出射強度をそれぞれ帯色の無い良好な白が得られるように調整する必要はなく、したがって、前記赤、 [0058] Moreover, the liquid crystal display device, is to display white by reflecting light incident from the front by the reflective polarizer layer 8, the conventional displays white by color mixing of a plurality of colors of colored light as in the liquid crystal display device, it is not necessary to adjust the plurality of the emission intensity of the colored light of the color for good white without each band colors is obtained, therefore, the red,
緑、青のカラーフィルタ7R,7G,7Bの吸収特性および層厚をそれぞれ色純度の高い着色光が得られるように設定し、色質の良いカラー画像を表示することができる。 Green, and blue color filters 7R of, 7G, set 7B of absorption and thickness to as high color light color purity each can be obtained, it is possible to display a good color image with color quality.

【0059】また、この実施例の液晶表示装置は、高デューティでの時分割駆動が可能なSTN型のものであるが、前基板1の前面に配置された偏光板11と前記前基板1との間に位相差板12を設けているため、STN型の液晶表示装置において問題とされる表示の帯色をほとんど無くすことができる。 [0059] The liquid crystal display device of this embodiment is of the time-division driving is possible STN type at high duty, before the polarizing plate 11 disposed on the front surface of the substrate 1 and the front substrate 1 since there is provided a retardation plate 12 between, it can be substantially eliminated band color display in question in STN type liquid crystal display device.

【0060】すなわち、前記位相差板12が無い場合を考えると、この実施例の液晶表示装置は、前記偏光板1 [0060] That is, considering the case where the retardation plate 12 is not, the liquid crystal display device of this embodiment, the polarizer 1
1の透過軸11aが前基板11の近傍における液晶分子配向方向1aに対して斜めにずれているため、前記偏光板11を透過して液晶層10入射した直線偏光が、この液晶層18の複屈折性により各波長光がそれぞれ偏光状態の異なる楕円偏光となった光になり、その光が偏光反射層8に入射する。 Since the first transmission shaft 11a is shifted obliquely with respect to the liquid crystal molecular alignment direction 1a in the vicinity of the front substrate 11, the linearly polarized light incident liquid crystal layer 10 is transmitted through the polarizing plate 11, double of the liquid crystal layer 18 each wavelength light by refractive become light becomes different elliptically polarized with each polarization state, the light is incident on the polarized light reflecting layer 8.

【0061】そして、前記偏光反射層8は、その反射軸8sに沿った偏光成分の入射光を反射し、透過軸8pに沿った偏光成分の入射光を透過させるが、この偏光反射層8に入射する光が上記のような各波長光がそれぞれ偏光状態の異なる楕円偏光となった光であると、その反射光と透過光がそれぞれ、可視光帯域の各波長光ごとの光強度が互いに異なる分光強度分布の光となり、その分光強度分布に応じた色に帯色する。 [0061] Then, the polarization reflecting layer 8 reflects the incident light of polarization component along the reflection axis 8s, but transmits the incident light polarization component along the transmission axis 8p, this polarized light reflecting layer 8 When the incident light is a light the wavelength as described above becomes different elliptically polarized with each polarization state, the reflected light and transmitted light, respectively, different light intensities for each wavelength in the visible light band from each other It becomes spectral intensity distribution of the light, to Obishoku the color corresponding to the spectral intensity distribution.

【0062】そのため、位相差板12が無い場合は、前記偏光反射層8で反射された光により表示される白が何らかの色を帯び、また、前記偏光反射層8を透過し前記カラーフィルタ7R,7G,7Bの色に着色して出射する光により表示される色に、色ずれが発生する。 [0062] Therefore, when there is no phase difference plate 12, tinged white some color displayed by the light reflected by the polarized light reflecting layer 8, also the color filters 7R transmitted through the polarization reflection layer 8, 7G, the color displayed by the light emitted by colored in a color other 7B, the color shift occurs.

【0063】しかし、この実施例では、前記偏光板11 [0063] However, in this embodiment, the polarizer 11
と前記前基板1との間に、前記液晶層10のΔndに応じて設定されたリタデーションを有する位相差板12を設けているため、前記液晶層18の複屈折性により各波長光がそれぞれ偏光状態の異なる楕円偏光となった光になるのを、前記位相差板12の複屈折作用により補償して、表示の帯色を無くすように設定しているため、前記位相差板12の複屈折作用により補償して上述した光の帯色を無くし、白の表示の帯色および前記カラーフィルタ7R,7G,7Bによる表示色の色ずれが無い、良好な色質のカラー画像を表示することができる。 And the between the front substrate 1, the order is provided with the retardation plate 12 with a retardation which is set in accordance with the Δnd of the liquid crystal layer 10, polarizing the respective wavelength light by birefringence of the liquid crystal layer 18 each light to become light a different elliptically polarized of state, and compensated by the birefringence effect of the retardation plate 12, since the set so as to eliminate the band color display, the birefringence of the retardation plate 12 eliminating band color of light as described above is compensated by the action, the band color display of white and the color filters 7R, 7G, there is no color shift of the display colors by 7B, is possible to display a color image of good color quality it can.

【0064】しかも、この実施例では、前記偏光板11 [0064] Moreover, in this embodiment, the polarizer 11
と前記前基板1との間に光拡散層13を設けているため、前記偏光反射層8により反射される白色光が鏡面反射光であっても、その白色光を広範囲に拡散させて前方に出射するとともに、前記偏光反射層8を透過し、前記カラーフィルタ7R,7G,7Bの色に着色して反射板14により反射された着色光も広範囲に拡散させて前方に出射することができ、したがって、広い視野角を得ることができる。 Since there is provided a light diffusion layer 13 between the front substrate 1 and the even white light reflected by the polarization reflection layer 8 is a specular reflection light, forward by diffusing the white light extensively while emitting the polarized light reflecting layer 8 passes, the color filter 7R, 7G, colored light reflected by the reflecting plate 14 and colored in a color other 7B also widely diffused can be emitted to the front, Therefore, it is possible to obtain a wide viewing angle.

【0065】なお、上記第1の実施例では、カラーフィルタ7R,7G,7Bを後基板2の内面に設け、このカラーフィルタ7R,7G,7Bの上に偏光反射層8を設けているが、前記カラーフィルタ7R,7G,7Bは、 [0065] In the above first embodiment, a color filter 7R, 7G, 7B provided on the inner surface of the rear substrate 2, the color filter 7R, 7G, is provided with the polarizing reflective layer 8 on top of 7B, the color filters 7R, 7G, 7B is,
液晶層10と反射板14との間であれば、前記後基板2 If between the liquid crystal layer 10 and the reflection plate 14, the rear substrate 2
の内面側と背面側のいずれに設けてもよく、また、前記偏光反射層8は、前記カラーフィルタ7R,7G,7B May be provided on any of the inner surface side and the back side, also, the polarization reflecting layer 8, the color filter 7R, 7G, 7B
の前記液晶層10との間であれば、前記後基板の内面側と背面側のいずれに設けてもよい。 If between the liquid crystal layer 10 may be provided either on the back side the inner surface side of the rear substrate.

【0066】図4はこの発明の第2の実施例を示す液晶表示装置のハッチングを省略した断面図であり、この実施例の液晶表示装置は、後基板2の背面に前記偏光反射層8を設け、この偏光反射層8の背面に赤、緑、青の3 [0066] Figure 4 is a sectional view hatching of the liquid crystal display device showing a second embodiment of the present invention, a liquid crystal display device of this embodiment, the polarizing reflective layer 8 on the back surface of the rear substrate 2 provided, red on the back of the polarized light reflecting layer 8, green, and blue 3
色のカラーフィルタ7R,7G,7Bを設けたものである。 Color filters 7R of, those provided 7G, the 7B.

【0067】なお、この実施例の液晶表示装置は、偏光反射層8とカラーフィルタ7R,7G,7Bの両方を後基板2の背面に設けたものであるが、他の構成は上述した第1の実施例の液晶表示装置と同じであるため、重複する説明は図に同符号を付して省略する。 [0067] The liquid crystal display device of this embodiment, the polarized light reflecting layer 8 and the color filters 7R, 7G, first it but on the rear surface of the rear substrate 2 both 7B, other configurations described above is the same as in example liquid crystal display device, and redundant description will be omitted by the same symbol in FIG.

【0068】この実施例においても、前記液晶層10と後基板2の背後に設けられた反射板14との間に赤、 [0068] Also in this embodiment, the red between the reflecting plate 14 provided behind the rear substrate 2 and the liquid crystal layer 10,
緑、青の3色のカラーフィルタ7R,7G,7Bを設け、これらのカラーフィルタ7R,7G,7Bと前記液晶層10との間に、互いにほぼ直交する方向に反射軸8 Green, color filters 7R three colors blue, 7G, and 7B is provided, these color filters 7R, 7G, between 7B and the liquid crystal layer 10, reflection axis in a direction substantially perpendicular to each other 8
sと透過軸8pとをもち、前記反射軸8sに沿った偏光成分の入射光を反射し、前記透過軸8pに沿った偏光成分の入射光を透過させる偏光反射層8を設ているため、 Has a s a transmission axis 8p, reflect incident light polarization components along the reflection axis 8s, for which the set of polarizing reflective layer 8 which transmits the incident light of the transmission axis polarization component along the 8p,
上述した第1の液晶表示装置と同様に、白の表示が明るく、また色質の良いカラー画像を表示することができる。 Like the first liquid crystal display device described above, it is possible to display the white bright, also displays a good color image with color quality.

【0069】なお、上記第1および第2の実施例では、 [0069] Incidentally, in the above first and second embodiment,
前基板1の前面に配置された偏光板11と前基板1との間に光拡散層13を設けているが、この光拡散層13を省略し、前記偏光反射層8にその反射軸8sに沿った偏光成分の光を散乱反射する機能をもたせるとともに、後基板2の背後に設ける反射板14を散乱反射板とすることにより、広い視野角を得るようにしてもよい。 It is provided with the light diffusion layer 13 between the polarizing plate 11 disposed before the front surface of the substrate 1 and the front substrate 1, to omit this light diffusion layer 13, its reflection axis 8s to the polarized light reflecting layer 8 with the light of the polarized component along impart a function to diffuse reflection, a reflective plate 14 provided behind the rear substrate 2 by a scattering reflection plate, it may be obtained a wide viewing angle.

【0070】また、上記各実施例の液晶表示装置は、複数の色の着色層として、赤、緑、青の3色のカラーフィルタ7R,7G,7Bを備えたものであるが、前記複数の着色層は、赤、緑、青の3色のカラーフィルタに限らず、例えば、イエロー、マゼンタ、シアンの3色のカラーフィルタを備えて多色カラー画像を表示するようにしてもよい。 [0070] Further, the liquid crystal display device of each embodiment, as a colored layer of a plurality of colors, red, green, color filters 7R three colors blue, 7G, which was provided with a 7B, the plurality of colored layer, red, green, not limited to a color filter of three colors of blue, for example, yellow, magenta, may be displayed multi-color image comprising three color filters of cyan.

【0071】さらに、上記各実施例の液晶表示装置は、 [0071] Further, the liquid crystal display device of the above embodiments,
STN型のものであるが、この発明は、液晶層の液晶分子を例えばほぼ90ツイスト角でツイスト配向させたT But it is of STN type, and the invention is to twist alignment of liquid crystal molecules of the liquid crystal layer for example at approximately 90 twist angle T
N型の液晶表示装置や、強誘電性液晶または反強誘電性液晶を用いた強誘電性液晶表示装置などにも適用することができ、その場合は、上記実施例で備えた帯色補償用の位相差板12は無くてよい。 And N-type liquid crystal display device, the strength can be applied to such a ferroelectric liquid crystal display device using a ferroelectric liquid crystal or anti-ferroelectric liquid crystal, in that case, for band color compensation with the above Example difference of the phase plate 12 may not.

【0072】また、上記各実施例の液晶表示装置は、単純マトリックス方式のものであるが、この発明は、液晶層をはさんで対向する前後一対の基板のうちの一方の基板の内面に、マトリックス状に配列する複数の画素電極と、これらの画素電極にそれぞれ接続された複数のアクティブ素子(例えば薄膜トランジスタ)と、前記複数のアクティブ素子に信号を供給するための複数の配線とが設けられ、他方の基板の内面に、前記複数の画素電極と対向する対向電極が設けられたアクティブマトリックス方式の液晶表示装置にも適用することができる。 [0072] Further, the liquid crystal display device of each embodiment is of the simple matrix system, the present invention is the one of the inner surfaces of the substrates of the pair of substrates before and after facing across the liquid crystal layer, a plurality of pixel electrodes arranged in a matrix form, and these are connected to a plurality of active elements in the pixel electrode (for example, a thin film transistor), and a plurality of wirings are provided for supplying a signal to said plurality of active elements, the inner surface of the other substrate, can also be applied to a liquid crystal display device of active matrix type wherein a plurality of pixel electrodes facing the counter electrodes are provided.

【0073】このアクティブマトリックス液晶表示装置の場合も、前基板の前面に偏光板を配置し、後基板の背後に反射手段を配置するとともに、前記液晶層と前記反射手段との間に、複数の画素領域にそれぞれ対応する複数の色の着色層を設け、これらの着色層と前記液晶層との間に、反射軸に沿った偏光成分の入射光を反射し、透過軸に沿った偏光成分の入射光を透過させる偏光反射層を設けることにより、白の表示が明るく、また色質の良いカラー画像を表示することができる。 [0073] In the case of the active matrix liquid crystal display device, before the polarizing plate disposed on the front surface of the substrate, while disposing the reflecting means behind the rear substrate, between said reflecting means and said liquid crystal layer, a plurality of a colored layer of a plurality of colors corresponding to the pixel area is provided, between the coloring layer and the liquid crystal layer, it reflects incident light polarization component along the reflector axis, the polarization component along the transmission axis by providing the polarizing reflective layer that transmits incident light, bright display of white and can be displayed with good color images color quality.

【0074】さらにまた、上記実施例の液晶表示装置は、後基板2の背後に配置する反射手段に反射板14を用いた、外光を利用する反射型表示だけを行なうものであるが、この発明は、外光を利用する反射型表示と、背後からの照明光を利用する透過型表示との両方の表示を行なう、いわゆる2ウエイ表示型の液晶表示装置にも適用することができる。 [0074] Furthermore, the liquid crystal display device of the above embodiment, using a reflection plate 14 to the reflection means disposed behind the rear substrate 2, but performs only the reflective display utilizing external light, this invention can be carried out and the reflective display utilizing external light, the display both the transmissive display utilizing illumination light from behind, also applicable to liquid crystal display device of the so-called two-way display type.

【0075】すなわち、2ウエイ表示型の液晶表示装置は、充分な明るさの外光が得られる高照度の環境下では外光を利用する反射型表示を行ない、外光の明るさが不足するときに、外光を利用する反射型表示による画面輝度の不足を、前記照明光を利用する透過型表示の併用により補うようにしたものであり、この2ウエイ液晶表示装置は、充分な明るさの外光が得られない低照度の環境下でも使用することができる。 [0075] That is, two-way display type liquid crystal display device, in an environment of high-intensity outside light sufficient brightness is obtained performs reflective display utilizing external light, the lack of brightness of the ambient light Occasionally, the shortage of screen brightness by reflection type display utilizing external light, which has as compensated by the transmissive display of the combination of using the illumination light, the two-way liquid crystal display device, sufficient brightness can be used in an environment of no external light is obtained a low illuminance.

【0076】なお、この発明の液晶表示装置は、偏光反射層による外光の反射により白を表示するものであるため、前記照明光を利用する透過型表示を併用するときも、白表示の明るさは、前方から入射する外光の強度に対応した明るさであるが、前記偏光反射層により反射された光は、着色層による吸収を全く受けない光であるため、前方から入射する光の強度がある程度以上であれば、充分な明るさの白表示が得られる。 [0076] The liquid crystal display device of the present invention, since the reflection of external light by the polarized light reflecting layer is for displaying white, even when used in combination transmissive display utilizing the illumination light, white display brightness is is a brightness corresponding to the intensity of the external light incident from the front, the light reflected by the polarized light reflecting layer are the light that is not subjected to absorption by the coloring layer at all, of the light incident from the front if the intensity is greater than or equal to a certain extent, white display of sufficient brightness can be obtained.

【0077】この発明を前記2ウエイ表示型の液晶表示装置に適用する場合、後基板2の背後に配置する反射手段を半透過反射板とし、この半透過反射板の背後に、前面全体から照明光を出射するバックライトを配置してもよいが、前記反射手段として、例えば平成9年特許願第353603号の明細書および図面に記載された、理論的には光源からの光を100%出射し、前方からの入射光を100%反射するものを用いれば、光源からの照明光を高い効率で照明光として出射するとともに、前方からの入射光も高い反射率で反射することができる。 [0077] When applying the present invention to the two-way display type liquid crystal display device, the reflecting means to place behind the rear substrate 2 and the semi-transmissive reflective plate, behind the semi-transmissive reflective plate, the illumination from the entire front surface may be disposed a backlight for emitting light, it said as a reflection means, for example, Heisei described 9 years specification and drawings of Japanese Patent Application No. 353,603, theoretically the exit 100% light from the light source and, if a thing that reflects incident light from the front 100%, with emitted as illumination light illuminating light from the light source with high efficiency, can be reflected by the incident light is high reflectance from the front.

【0078】 [0078]

【発明の効果】この発明の液晶表示装置は、液晶層をはさんで対向する前後一対の基板のうちの前基板の前面に偏光板を配置し、後基板の背後に反射手段を配置するとともに、前記液晶層と前記反射手段との間に、複数の画素領域にそれぞれ対応する複数の色の着色層を設け、これらの着色層と前記液晶層との間に、反射軸に沿った偏光成分の入射光を反射し、透過軸に沿った偏光成分の入射光を透過させる偏光反射層を設けたものであるため、 [Effect of the Invention A liquid crystal display device of the present invention, with a polarizing plate disposed on the front surface of the front substrate of the pair of substrates before and after facing across the liquid crystal layer, placing a reflecting means behind the rear substrate , between the reflection means and the liquid crystal layer, a plurality of color colored layers corresponding to a plurality of pixel regions is provided, the polarization component, along the reflection axis between the coloring layer and the liquid crystal layer for reflect incident light, is provided with a polarizing reflective layer that transmits incident light of the polarized component along the transmission axis,
反射型のものであっても、白の表示が着色層による吸収がない明るい表示であり、また色質の良いカラー画像を表示することができる。 Also be of a reflective type, white display is bright display is not absorbed by the colored layer, also can be displayed with good color images color quality.

【0079】この発明の液晶表示装置において、前記複数の色の着色層は、前記液晶層と前記反射手段との間であれば、前記後基板の内面側と背面側のいずれに設けてもよく、また、前記偏光反射層は、前記着色層と前記液晶層との間であれば、前記後基板の内面側と背面側のいずれに設けてもよい。 [0079] In the liquid crystal display device of the present invention, the plurality of colors colored layers, if between the reflection means and the liquid crystal layer may be provided on either the back side the inner surface side of the rear substrate in addition, the polarizing reflective layer, if between the colored layer and the liquid crystal layer may be provided either on the back side the inner surface side of the rear substrate.

【0080】すなわち、例えば、前記偏光反射層と着色層の両方を後基板の内面側に設ける場合は、前記後基板の内面に前記着色層を設け、この着色層の上に前記偏光反射層を設ければよい。 [0080] That is, for example, the case of providing both of the polarized light reflecting layer and the coloring layer on the inner surface of the rear substrate, the colored layer provided on the inner surface of the rear substrate, said polarized light reflecting layer on top of the colored layer it may be provided. また、前記偏光反射層と着色層の両方を後基板の背面側に設ける場合は、前記後基板の背面に前記偏光反射層を設け、この偏光反射層の背面に前記着色層を設ければよく、いずれの構成としても、白の表示が明るく、また色質の良いカラー画像を表示することができる。 Also, in the case of providing both of the polarized light reflecting layer and the colored layer on the back side of the rear substrate, said polarized light reflecting layer provided on the back surface of the rear substrate, may be provided the colored layer on the back of the polarized light reflecting layer , as either configuration, it is possible to display the white bright, also displays a good color image with color quality.

【0081】さらに、前記複数の色の着色層は、赤、 [0081] In addition, the plurality of color colored layers of red,
緑、青またはイエロー、マゼンタ、シアンの3色のカラーフィルタが好ましく、この3色のカラーフィルタを備えることにより、フルカラー画像等の多色カラー画像を表示することができる。 Green, blue or yellow, magenta, and three color filters of cyan Preferably, by providing a color filter of three colors, it is possible to display a multi-color image such as a full color image.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】この発明の第1の実施例を示す液晶表示装置のハッチングを省略した断面図。 FIG. 1 is a cross-sectional view taken hatching of the liquid crystal display device showing a first embodiment of the present invention.

【図2】前記液晶表示装置における液晶層の液晶分子の配向状態と、偏光板の吸収軸と、位相差板の遅相軸と、 [Figure 2] and the alignment state of the liquid crystal molecules of the liquid crystal layer in the liquid crystal display device, the absorption axis of the polarizing plate, the slow axis of the retardation plate,
偏光反射層の反射軸および透過軸の向きを示す図。 It shows the direction of the reflection axis and the transmission axis of the polarizing reflective layer.

【図3】偏光反射層の斜視図。 Figure 3 is a perspective view of a polarizing reflective layer.

【図4】この発明の第2の実施例を示す液晶表示装置のハッチングを省略した断面図。 4 is a cross-sectional view is omitted hatching of the liquid crystal display device showing a second embodiment of the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

1…前基板 2…後基板 4,6…電極 5,9…配向膜 7R,7G,7B…カラーフィルタ(着色層) 8…偏光反射層 8s…反射軸 8p…透過軸 10…液晶層 11…偏光板 12…位相差板 13…拡散層 14…反射板(反射手段) 1 ... substrate before 2 ... rear substrate 4 and 6 ... electrodes 5,9 ... orientation film 7R, 7G, 7B ... color filter (colored layer) 8 ... polarized light reflective layer 8s ... reflection axis 8p ... transmission shaft 10 ... liquid crystal layer 11 ... polarizer 12 ... retardation plate 13 ... diffusion layer 14 ... reflecting plate (reflection means)

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】液晶層をはさんで対向する前後一対の基板のそれぞれの内面に、互いに対向する領域により複数の画素領域を形成する電極が設けられ、前記一対の基板のうちの前基板の前面に偏光板が配置され、後基板の背後に反射手段が配置されるとともに、前記液晶層と前記反射手段との間に、前記複数の画素領域にそれぞれ対応する複数の色の着色層が設けられ、これらの着色層と前記液晶層との間に、互いにほぼ直交する方向に反射軸と透過軸とをもち、前記反射軸に沿った偏光成分の入射光を反射し、前記透過軸に沿った偏光成分の入射光を透過させる偏光反射層が設けられていることを特徴とする液晶表示装置。 To claim 1, wherein each of inner surfaces of the pair of substrates before and after facing across the liquid crystal layer, an electrode to form a plurality of pixel regions is provided by a region facing each other, the front substrate of the pair of substrates polarizing plate is disposed in front, with reflective means behind the rear substrate are disposed, between said reflecting means and said liquid crystal layer, a colored layer of a plurality of colors corresponding to the plurality of pixel regions provided is, between the and the coloring layer liquid crystal layer has a transmission axis and the reflection axis in a direction substantially perpendicular to each other, and reflect incident light of the polarized component along the reflector axis, along said transmission axis the liquid crystal display device characterized by polarized reflection layer that transmits incident light of the polarized component is provided with.
  2. 【請求項2】後基板の内面に着色層が設けられ、この着色層の上に偏光反射層が設けられていることを特徴とする請求項1に記載の液晶表示装置。 Wherein the inner surface of the substrate after the colored layer is provided, the liquid crystal display device according to claim 1, characterized in that polarizing reflective layer is provided on the colored layer.
  3. 【請求項3】後基板の背面に偏光反射層が設けられ、この偏光反射層の背面に着色層が設けられていることを特徴とする請求項1に記載の液晶表示装置。 Polarization reflective layer is provided on the back of 3. After substrate, a liquid crystal display device according to claim 1, characterized in that the colored layer is provided on the back of the polarized light reflecting layer.
  4. 【請求項4】複数の色の着色層は、赤、緑、青またはイエロー、マゼンタ、シアンの3色のカラーフィルタであることを特徴とする請求項1〜3のいずれか1つに記載の液晶表示装置。 4. A plurality of color colored layers of red, green, blue or yellow, magenta, according to any one of claims 1 to 3, characterized in that the color filters of three colors of cyan The liquid crystal display device.
JP11234032A 1999-08-20 1999-08-20 Liquid crystal display device Pending JP2001056463A (en)

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