JPH09265085A - Liquid crystal picture display device using holographic color filter - Google Patents
Liquid crystal picture display device using holographic color filterInfo
- Publication number
- JPH09265085A JPH09265085A JP7393496A JP7393496A JPH09265085A JP H09265085 A JPH09265085 A JP H09265085A JP 7393496 A JP7393496 A JP 7393496A JP 7393496 A JP7393496 A JP 7393496A JP H09265085 A JPH09265085 A JP H09265085A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- transparent base
- liquid crystal
- light
- display device
- 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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- Optical Filters (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Liquid Crystal (AREA)
- Holo Graphy (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、フルカラー画像を
表示する液晶画像表示装置に関する。TECHNICAL FIELD The present invention relates to a liquid crystal image display device for displaying a full-color image.
【０００２】[0002]
【従来の技術】染料や顔料を用いた既存のカラーフィル
ターに代えて、ホログラムや回折格子の分光回折特性を
利用したカラーフィルター（以下、ＨＣＦ；Holographi
c Col-or Filter と称する）を用いたフルカラー液晶画
像表示装置が公知であり、以下のものが例示される。2. Description of the Related Art Instead of existing color filters using dyes and pigments, color filters utilizing the spectral diffraction characteristics of holograms and diffraction gratings (hereinafter referred to as HCF; Holographi).
A full-color liquid crystal image display device using a c-col-or filter) is known, and the following are exemplified.
【０００３】特開平５−２３２３１９号公報 液晶画像表示装置のうち、液晶ビデオプロジェクターの
改良に係る本出願人による提案であり、カラーフィルタ
ーの各色セル自体をホログラムによって構成し、赤・緑
・青のそれぞれの色に対応させた微小なドットのホログ
ラムからなるホログラムパネル（ＨＣＦ）を有し、ＨＣ
Ｆからの各色に対応したそれぞれの回折光が集光するよ
うに、透光部を設けたスリットを配置して、前記スリッ
トを通過した光を、スクリーン上に赤・緑・青のドット
として結像させる液晶ビデオプロジェクターである。Japanese Laid-Open Patent Publication No. 5-232319 This is a proposal by the applicant relating to the improvement of a liquid crystal video projector in a liquid crystal image display device, in which each color cell of the color filter itself is formed by a hologram, and red, green, and blue are formed. It has a hologram panel (HCF) consisting of holograms of minute dots corresponding to each color.
A slit provided with a light-transmitting part is arranged so that the diffracted light corresponding to each color from F is condensed, and the light passing through the slit is connected as red, green, and blue dots on the screen. It is a liquid crystal video projector that makes images.
【０００４】特開平５−２４９３１８号公報 ホログラム素子により液晶照射光を３原色画像表示用画
素（液晶セル）の配置に応じた方向に回折することで３
原色光に分光する。各３原色画像表示用画素が相対応す
る３原色光により照射されることでカラー画像を表示す
る。JP-A-5-249318 SUMMARY OF THE INVENTION A hologram element diffracts liquid crystal irradiation light in directions corresponding to the arrangement of three primary color image display pixels (liquid crystal cells).
Disperse into primary color light. A color image is displayed by irradiating each of the three primary color image display pixels with corresponding three primary color light.
【０００５】特開平６−３０８３３２号公報 入射光（白色光）をホログラムにより回折分光して所定
の空間的な周期で異なる波長の光を所望の位置に出射す
るようにして、（既存の）カラーフィルターを用いない
で、液晶表示用バックライト等の利用効率を大幅に向上
させる。Japanese Laid-Open Patent Publication No. 6-308332 discloses that incident light (white light) is diffracted and dispersed by a hologram so that light having different wavelengths is emitted to a desired position in a predetermined spatial cycle, and (existing) color Without using a filter, the use efficiency of the backlight for liquid crystal display etc. is greatly improved.
【０００６】上記〜の提案では、ＨＣＦを用いるこ
とにより、既存のカラーフィルターに比較して、液晶照
射光（白色バックライト）の吸収が少なく、光の利用効
率が向上し、明るく小消費電力のフルカラー液晶画像表
示装置が提供される。In the above-mentioned proposals, by using HCF, absorption of liquid crystal irradiation light (white backlight) is less than that of existing color filters, light utilization efficiency is improved, and bright and small power consumption is achieved. A full color liquid crystal image display device is provided.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記の
何れの提案も、ＨＣＦの全面を一度に照射することがで
きるような光源を用いることが前提となっており、ＨＣ
Ｆの全面を照射できないような限られた光源を用いたＨ
ＣＦ表示に係る提案は、現在までに報告されていない。However, in any of the above proposals, it is premised that a light source capable of irradiating the entire surface of the HCF at one time is used.
H using a limited light source that cannot irradiate the entire surface of F
No proposal for CF display has been reported to date.
【０００８】本発明は、全面を照射できないような限ら
れた光源を用いながら、白色照明光を透明基材の内部を
複数回反射させてホログラム・アレイまで到達させるこ
とにより、全面で機能させることが可能なＨＣＦとそれ
を利用した液晶画像表示装置を提供することを目的とす
る。According to the present invention, while using a limited light source that cannot irradiate the entire surface, white illumination light is reflected multiple times inside the transparent substrate to reach the hologram array, thereby allowing the entire surface to function. It is an object of the present invention to provide an HCF capable of achieving the above and a liquid crystal image display device using the HCF.
【０００９】[0009]
【課題を解決するための手段】すなわち本発明は、入射
する白色照明光を光フィルターにより分光して赤・緑・
青の各波長分布の光に分離させ、液晶パネルの３原色画
像表示用画素を対応する３原色光により照射することで
フルカラー画像を表示する液晶画像表示装置において、
光フィルターが、回折波長選択性を有し赤・緑・青のそ
れぞれの色を回折するホログラム・アレイを透明基材上
に略マトリクス状に配置してなる構成のホログラフィッ
ク・カラーフィルターであると共に、前記カラーフィル
ターの透明基材の一側縁から、平行な白色照明光を透明
基材の内部に、透明基材と空気との臨界角より大きい角
度で入射させる照明光源を備えることを特徴とする液晶
画像表示装置である。That is, according to the present invention, incident white illumination light is separated by an optical filter into red, green, and red light.
In a liquid crystal image display device for displaying a full-color image by separating the light of each wavelength distribution of blue and irradiating the three primary color image display pixels of the liquid crystal panel with the corresponding three primary color light,
The optical filter is a holographic color filter having a structure in which hologram arrays having diffraction wavelength selectivity and diffracting each of red, green and blue colors are arranged in a substantially matrix on a transparent substrate. An illumination light source that causes parallel white illumination light to enter the transparent base material from one side edge of the transparent base material of the color filter at an angle larger than a critical angle between the transparent base material and air. It is a liquid crystal image display device.
【００１０】上記ホログラム・アレイは、用途に応じ
て、回折波長選択性を有する反射型ホログラムと透過型
ホログラムの両方が使用できる。As the hologram array, both a reflection type hologram and a transmission type hologram having diffraction wavelength selectivity can be used depending on the application.
【００１１】また、透明基材の内部に平行な白色照明光
を上記角度で入射させるために、補助プリズムを、その
入射面が、入射する白色照明光にほぼ垂直となるように
透明基材に隣接して配置することが一層好適である。In order to allow parallel white illumination light to enter the transparent substrate at the above-mentioned angle, the auxiliary prism is provided on the transparent substrate so that its incident surface is substantially perpendicular to the incident white illumination light. It is more preferable to arrange them adjacently.
【００１２】[0012]
【発明の実施の形態】図１は、本発明の一実施形態を示
す断面説明図である。ＨＣＦは、回折波長選択性を有し
赤・緑・青のそれぞれの色を回折する反射型ホログラム
からなるホログラム・アレイを、透明基材上（同図で、
透明基材の左側）に略マトリクス状に配置してなる構成
である。図１では、赤・緑・青のホログラム・アレイを
それぞれ１つずつ表して説明を簡略化しているが、図４
に全体的な概略図を示す。1 is a cross-sectional explanatory view showing an embodiment of the present invention. The HCF has a hologram array consisting of a reflection type hologram having a diffraction wavelength selectivity and diffracting each color of red, green and blue on a transparent substrate (in the figure,
This is a structure in which the matrix is arranged on the left side of the transparent substrate). In FIG. 1, one hologram array for each of red, green, and blue is shown to simplify the description.
Shows the overall schematic diagram.
【００１３】ＨＣＦの透明基材の端面近傍に設けられた
照明光源（図示せず）から、補助プリズムを経て、平行
な白色照明光が前記端面から透明基材の内部に入射され
る。From the illumination light source (not shown) provided in the vicinity of the end face of the transparent base material of the HCF, parallel white illumination light is made incident on the inside of the transparent base material from the end face via the auxiliary prism.
【００１４】透明基材の内部に入射される平行な白色照
明光の入射角θは、透明基材と空気との臨界角より大き
い角度とする必要があり、透明基材の屈折率をｎとした
場合、下記条件を満たす必要がある。 θ＞ａｒｃｓｉｎ（１／ｎ） 前記角度とすることにより、透明基材が空気と接する面
では、入射光は全反射する経路をとり、その経路に応じ
て順次異なるホログラム・アレイに到達することにな
る。The incident angle θ of the parallel white illumination light incident on the inside of the transparent substrate must be larger than the critical angle between the transparent substrate and air, and the refractive index of the transparent substrate is n. If you do, the following conditions must be met. θ> arcsin (1 / n) By setting the angle as described above, the incident light takes the path of total reflection on the surface of the transparent base material in contact with the air, and sequentially reaches different hologram arrays according to the path. Become.
【００１５】白色照明光のうち、図１で実線で表す特定
の１本の光路について説明する。補助プリズムの入射面
にほぼ垂直に入射して、一旦前記プリズムが空気と接す
る面で全反射することにより、透明基材の端面から入射
角θとなるように経路をとる。Of the white illumination light, one specific optical path represented by the solid line in FIG. 1 will be described. The light is incident on the incident surface of the auxiliary prism substantially perpendicularly, and once the prism is totally reflected on the surface in contact with air, a path is taken from the end surface of the transparent substrate to have an incident angle θ.
【００１６】次いで、青色光を反射回折するホログラム
・アレイに到達し、青色成分の光の一部が、同図で透明
基材の右側に反射回折されて透明基材からほぼ垂直に出
射する。Next, the light reaches the hologram array that reflects and diffracts the blue light, and a part of the light of the blue component is reflected and diffracted to the right side of the transparent base material in the figure, and is emitted almost vertically from the transparent base material.
【００１７】反射回折光の出射角度は、透明基材と空気
との臨界角より小さいため、界面で全反射せずに透明基
材から出射して、液晶パネルの対応する青色画像表示用
画素（液晶セル）に入射する。Since the outgoing angle of the reflected diffracted light is smaller than the critical angle between the transparent base material and the air, the reflected diffracted light exits from the transparent base material without being totally reflected at the interface, and corresponds to the corresponding blue image display pixel ( Liquid crystal cell).
【００１８】上記アレイで反射回折されなかった光（青
色成分以外の光と、残りの青色成分の光）は、上記アレ
イで全反射した後、透明基材が空気と接する面で再度全
反射する。（図３参照） 図面では、照明光が透明基材とホログラム・アレイとの
界面で全反射しているように表現されているが、透明基
材とホログラム・アレイの屈折率は近いため、実際には
ホログラム・アレイと空気とが接する面で前記の全反射
は行われる。The light that has not been reflected and diffracted by the array (the light other than the blue component and the remaining blue component) is totally reflected by the array and then totally reflected again on the surface of the transparent substrate that is in contact with air. . (Refer to FIG. 3) In the drawing, the illumination light is expressed as being totally reflected at the interface between the transparent substrate and the hologram array. However, since the transparent substrate and the hologram array have similar refractive indices, In the above, total reflection is performed on the surface where the hologram array and air contact.
【００１９】次いで、赤色光を反射回折するホログラム
・アレイに到達し、同様に赤色成分の光の一部が反射回
折されて透明基材からほぼ垂直に出射し、液晶パネルの
対応する赤色画像表示用画素（液晶セル）に入射するこ
とになる。Next, the light reaches the hologram array that reflects and diffracts the red light, and similarly, a part of the light of the red component is reflected and diffracted and is emitted almost vertically from the transparent substrate, and the corresponding red image display on the liquid crystal panel is performed. The light is incident on the pixel for use (liquid crystal cell).
【００２０】上記の一連の動作を繰り返すことにより、
全面でアレイに応じた所望の色の光を発するＨＣＦとし
て機能することになる。図１で実線で表した以外の光路
（例えば、点線で表す光路）も同様であることは当然で
ある。By repeating the above series of operations,
The entire surface functions as an HCF that emits light of a desired color according to the array. It goes without saying that the optical paths other than those shown by the solid lines in FIG. 1 (for example, the optical paths shown by the dotted lines) are the same.
【００２１】透明基材の内部への入射光は、上記のよう
に平行な白色照明光が理想的であるが、透明基材の内部
で入射角度に拡がりを持たないことが必須であり、ビー
ム状の細い光線であっても良い。The incident white light inside the transparent substrate is ideally parallel white illumination light as described above, but it is essential that the incident angle does not spread inside the transparent substrate. It may be a thin light beam.
【００２２】図２は、本発明の他の実施形態を示す断面
説明図であり、ホログラム・アレイとして、回折波長選
択性を有し赤・緑・青のそれぞれの色を回折する透過型
ホログラムを用いている。FIG. 2 is a cross-sectional explanatory view showing another embodiment of the present invention. As a hologram array, a transmission hologram having diffraction wavelength selectivity and diffracting each of red, green and blue colors is used. I am using.
【００２３】ホログラム・アレイでは、到達した入射光
の所望波長（色成分）の光を、同図で透明基材の左側に
透過回折するため、液晶パネルも透明基材の左側に配置
されることになり、他は先の実施形態と全く同様であ
る。In the hologram array, since the light of the desired wavelength (color component) of the incoming light that has arrived is transmitted and diffracted to the left side of the transparent base material in the figure, the liquid crystal panel should also be arranged on the left side of the transparent base material. Others are exactly the same as the previous embodiment.
【００２４】[0024]
【発明の効果】回折光のみがＨＣＦから出射し、他の光
は透明基材内で全反射するため、染料や顔料を用いた既
存のカラーフィルターに比べて、白色照明光が効率良く
利用される。また、従来のＨＣＦと比べては、全面を照
射できないような限られた光源を用いながら、全面で機
能させることが可能なＨＣＦが提供される。従って、透
明基材を薄型（図１，２で、左右方向に）に構成するこ
とができ、スペースをとらないコンパクトな液晶画像表
示装置が提供される。EFFECTS OF THE INVENTION Since only the diffracted light is emitted from the HCF and the other light is totally reflected inside the transparent substrate, the white illumination light is used more efficiently than the existing color filters using dyes and pigments. It Further, as compared with the conventional HCF, an HCF is provided that can function on the entire surface while using a limited light source that cannot irradiate the entire surface. Therefore, the transparent base material can be made thin (in the left and right directions in FIGS. 1 and 2), and a compact liquid crystal image display device that does not take up space is provided.
【００２５】[0025]
【図１】本発明の一実施形態を示す断面説明図。FIG. 1 is an explanatory sectional view showing an embodiment of the present invention.
【図２】本発明の他の実施形態を示す断面説明図。FIG. 2 is a cross-sectional explanatory view showing another embodiment of the present invention.
【図３】図１におけるホログラム・アレイの光学特性を
示す説明図。FIG. 3 is an explanatory diagram showing optical characteristics of the hologram array in FIG.
【図４】図１の全体的な概略を示す斜視図。FIG. 4 is a perspective view showing the overall outline of FIG.
Claims (4)
分光して赤・緑・青の各波長分布の光に分離させ、液晶
パネルの３原色画像表示用画素を対応する３原色光によ
り照射することでフルカラー画像を表示する液晶画像表
示装置において、 光フィルターが、回折波長選択性を有し赤・緑・青のそ
れぞれの色を回折するホログラム・アレイを透明基材上
に略マトリクス状に配置してなる構成のホログラフィッ
ク・カラーフィルターであると共に、 前記カラーフィルターの透明基材の一側縁から、平行な
白色照明光を透明基材の内部に、透明基材と空気との臨
界角より大きい角度で入射させる照明光源を備えること
を特徴とする液晶画像表示装置。1. White incident illuminating light is split by an optical filter to be separated into light having wavelength distributions of red, green and blue, and the pixels for displaying three primary color images of a liquid crystal panel are irradiated with corresponding three primary color light. In a liquid crystal image display device that displays a full-color image, an optical filter has a hologram array that has diffraction wavelength selectivity and that diffracts each of red, green, and blue colors in a substantially matrix form on a transparent substrate. With the holographic color filter having the configuration, the parallel white illumination light is introduced from one side edge of the transparent base material of the color filter into the transparent base material from the critical angle between the transparent base material and air. A liquid crystal image display device, comprising an illumination light source for making the light incident at a large angle.
有する反射型ホログラムからなる請求項１記載の液晶画
像表示装置。2. The liquid crystal image display device according to claim 1, wherein the hologram array comprises a reflection hologram having a diffraction wavelength selectivity.
有する透過型ホログラムからなる請求項１記載の液晶画
像表示装置。3. The liquid crystal image display device according to claim 1, wherein the hologram array comprises a transmission hologram having a diffraction wavelength selectivity.
するように、透明基材への白色照明光の入射角度を制御
する補助プリズムを備えることを特徴とする請求項１〜
請求項３の何れかに記載の液晶画像表示装置。4. An auxiliary prism for controlling the incident angle of the white illumination light on the transparent base material so that the incident white illumination light is totally reflected in the transparent base material.
The liquid crystal image display device according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7393496A JPH09265085A (en) | 1996-03-28 | 1996-03-28 | Liquid crystal picture display device using holographic color filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7393496A JPH09265085A (en) | 1996-03-28 | 1996-03-28 | Liquid crystal picture display device using holographic color filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09265085A true JPH09265085A (en) | 1997-10-07 |
Family
ID=13532461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7393496A Pending JPH09265085A (en) | 1996-03-28 | 1996-03-28 | Liquid crystal picture display device using holographic color filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09265085A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002003130A1 (en) * | 2000-06-30 | 2002-01-10 | Neurok, Llc | Color liquid crystal display |
| JP2002148717A (en) * | 2000-11-08 | 2002-05-22 | Dainippon Printing Co Ltd | Reflection type hologram screen and projection display device using the same |
| WO2007074787A1 (en) * | 2005-12-27 | 2007-07-05 | Matsushita Electric Industrial Co., Ltd. | Planar lighting device and liquid crystal display device using same |
| JP2010122590A (en) * | 2008-11-21 | 2010-06-03 | Toshiba Corp | Liquid crystal display, light guide plate and light guide method |
| JP4524807B2 (en) * | 1999-02-12 | 2010-08-18 | 凸版印刷株式会社 | Holographic color filter and liquid crystal display device using the same |
| JP2011099972A (en) * | 2009-11-05 | 2011-05-19 | Toppan Printing Co Ltd | Optical member, and el display device and el lighting system using the same |
| JP2015102613A (en) * | 2013-11-22 | 2015-06-04 | セイコーエプソン株式会社 | Optical device and display device |
| JP2015194549A (en) * | 2014-03-31 | 2015-11-05 | セイコーエプソン株式会社 | Optical device, image projection apparatus, and electronic equipment |
| JP2018503877A (en) * | 2015-01-28 | 2018-02-08 | レイア、インコーポレイテッドＬｅｉａ Ｉｎｃ． | 3D (3D) electronic display |
-
1996
- 1996-03-28 JP JP7393496A patent/JPH09265085A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4524807B2 (en) * | 1999-02-12 | 2010-08-18 | 凸版印刷株式会社 | Holographic color filter and liquid crystal display device using the same |
| WO2002003130A1 (en) * | 2000-06-30 | 2002-01-10 | Neurok, Llc | Color liquid crystal display |
| JP2002148717A (en) * | 2000-11-08 | 2002-05-22 | Dainippon Printing Co Ltd | Reflection type hologram screen and projection display device using the same |
| WO2007074787A1 (en) * | 2005-12-27 | 2007-07-05 | Matsushita Electric Industrial Co., Ltd. | Planar lighting device and liquid crystal display device using same |
| US7859610B2 (en) | 2005-12-27 | 2010-12-28 | Panasonic Corporation | Planar lighting and LCD device with a laser light source emitting a linearly-polarized laser beam, optical member to parallelize the beam and a plate-shaped light guide for emitting part of the beam |
| JP2010122590A (en) * | 2008-11-21 | 2010-06-03 | Toshiba Corp | Liquid crystal display, light guide plate and light guide method |
| JP2011099972A (en) * | 2009-11-05 | 2011-05-19 | Toppan Printing Co Ltd | Optical member, and el display device and el lighting system using the same |
| JP2015102613A (en) * | 2013-11-22 | 2015-06-04 | セイコーエプソン株式会社 | Optical device and display device |
| JP2015194549A (en) * | 2014-03-31 | 2015-11-05 | セイコーエプソン株式会社 | Optical device, image projection apparatus, and electronic equipment |
| JP2018503877A (en) * | 2015-01-28 | 2018-02-08 | レイア、インコーポレイテッドＬｅｉａ Ｉｎｃ． | 3D (3D) electronic display |
| US11194086B2 (en) | 2015-01-28 | 2021-12-07 | Leia Inc. | Three-dimensional (3D) electronic display |
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