JPH06324316A - Picture display device - Google Patents

Picture display device

Info

Publication number
JPH06324316A
JPH06324316A JP5074455A JP7445593A JPH06324316A JP H06324316 A JPH06324316 A JP H06324316A JP 5074455 A JP5074455 A JP 5074455A JP 7445593 A JP7445593 A JP 7445593A JP H06324316 A JPH06324316 A JP H06324316A
Authority
JP
Japan
Prior art keywords
light
liquid crystal
order
intensity
order light
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.)
Granted
Application number
JP5074455A
Other languages
Japanese (ja)
Other versions
JP2843479B2 (en
Inventor
Ikuo Onishi
伊久雄 大西
Katsuya Fujisawa
克也 藤沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kuraray Co Ltd
Original Assignee
Kuraray Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kuraray Co Ltd filed Critical Kuraray Co Ltd
Priority to JP5074455A priority Critical patent/JP2843479B2/en
Priority to KR1019930006892A priority patent/KR0120397B1/en
Priority to EP93106795A priority patent/EP0567995A1/en
Priority to US08/052,832 priority patent/US5513025A/en
Publication of JPH06324316A publication Critical patent/JPH06324316A/en
Application granted granted Critical
Publication of JP2843479B2 publication Critical patent/JP2843479B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the deterioration of pictures due to shadows of non-linear element parts and pixel element parts for driving liquid crystal of liquid crystal cells, etc., and to obtain pictures having a high contrast. CONSTITUTION:This device is provided with picture display units of liquid crystal cells 4 on which many pixels of dot states are arranged in two- dimensionally, etc., and a phase grid 5 arranged in a display optical path 2 of the picture display unit and having grid patterns in two direction. In the device, in the center wave-length of the picture display unit, the strengthes of (+ or -1,0)th-order lights and (0, + or -1)th-order lights are in the range of 60 to 180% with respect to the strength of a zeroth-order light, the strength of (+ or -1, + or -1)th-order lights are in the range of 20 to 30% with respect to the strength of the zeroth-order light and further, the sum of the strength of the zeroth-order light and the strengthes of (+ or -1,0)th-order lights, (0,+ or -1)th-order lights and (+ or -, + or -)th-order lights is >=70% with respect to whole diffracted light beam in the center wave length.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は液晶セルをライトバルブ
(light valve)として用いた背面投射方式
の液晶表示装置等の画像表示装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device such as a rear projection type liquid crystal display device using a liquid crystal cell as a light valve.

【0002】[0002]

【従来の技術】この種の液晶表示装置は、光源からの光
を液晶セルにその背面から照射し、この液晶セルの画像
を液晶セルの前面側で目視観察するものである。このよ
うに液晶セルを通過した光を目視することから、液晶セ
ルの画素電極や導線の影が投影されて、画質が低下する
場合がある。特に、液晶セルの駆動方式として、各画素
に薄膜トランジスタなどの非線形素子を組み込んだアク
ティブマトリクス方式を採用することにより、表示情報
量を多くして、TV画像を表示可能としたものにあって
は、このアクティブマトリクス形液晶を駆動するための
非線形素子部および画素電極部が不透明であるために、
これらのかなり濃い影が投影される。特に、レンズによ
り拡大して目視観察した場合、影が拡大されて画質が大
きく低下する。この非線形素子部や電極などの影による
画質低下を解消するために、位相格子を液晶セルの前面
側、つまり目視者側に設けることが提案されている。
2. Description of the Related Art In a liquid crystal display device of this type, light from a light source is applied to a liquid crystal cell from its back surface, and an image of the liquid crystal cell is visually observed on the front surface side of the liquid crystal cell. Since the light passing through the liquid crystal cell is visually observed in this way, the shadows of the pixel electrodes and conducting wires of the liquid crystal cell may be projected and the image quality may deteriorate. In particular, as a liquid crystal cell driving method, by adopting an active matrix method in which a non-linear element such as a thin film transistor is incorporated in each pixel, the amount of display information is increased and a TV image can be displayed. Since the non-linear element portion and the pixel electrode portion for driving this active matrix type liquid crystal are opaque,
These fairly dark shadows are projected. In particular, when magnified by a lens and visually observed, the shadow is magnified and the image quality is greatly deteriorated. It has been proposed to provide a phase grating on the front surface side of the liquid crystal cell, that is, on the viewer side in order to eliminate the deterioration of the image quality due to the shadow of the non-linear element portion or the electrode.

【0003】[0003]

【発明が解決しようとする課題】かかる位相格子により
画素電極部などの影による画質低下は防止できるもの
の、画像のコントラストが低下し、画像がぼけて見える
という課題があった。本発明は、上述した点に鑑みてな
されたものであって、非線形素子部や電極などの影によ
る画質低下を解消するとともに、画像のコントラストの
低下割合を低減した画像表示装置を提供することを目的
とする。
Although the phase grating can prevent the image quality from being deteriorated due to the shadow of the pixel electrode portion or the like, it has a problem that the contrast of the image is deteriorated and the image looks blurred. The present invention has been made in view of the above points, and provides an image display device that eliminates the deterioration of image quality due to the shadow of the non-linear element portion, the electrode, and the like, and that reduces the reduction ratio of the image contrast. To aim.

【0004】[0004]

【課題を解決するための手段】本発明によれば、上記目
的は、ドット状の画素が2次元的に多数配列された画像
表示器と、この画像表示器の表示光路に配置された、2
方向に格子パターンを持つ位相格子とを備え、上記画像
表示器の中心波長において、0次光の強度に対する(±
1,0)次光および(0,±1)次光の強度が60〜1
80%の範囲にあり、0次光の強度に対する(±1,±
1)次光の強度が20〜330%の範囲にあり、かつ0
次光の強度と(±1,0)次光、(0,±1)次光およ
び(±1,±1)次光の強度との合計が、全回折光の強
度に対して上記中心波長において70%以上であること
を特徴とする画像表示装置により達成される。なお、本
発明における中心波長とは、画像表示器に入射する表示
光の波長領域の中心値(例えば、カラー画像表示器であ
れば赤色光と青色光との平均値)をいい、全回折光と
は、0次光および±1次以上の全ての回折光をいう。
According to the present invention, the above object is to provide an image display in which a large number of dot-shaped pixels are two-dimensionally arranged, and an image display arranged in the display optical path of the image display.
And a phase grating having a grating pattern in the direction, at the center wavelength of the image display device (±
The intensity of the (1,0) order light and the (0, ± 1) order light is 60 to 1
It is in the range of 80%, and it is (± 1, ±
1) The intensity of the next light is in the range of 20 to 330%, and 0
The sum of the intensity of the next light and the intensity of the (± 1,0) order light, the (0, ± 1) order light, and the (± 1, ± 1) order light is the above central wavelength with respect to the intensity of all diffracted light. Is 70% or more in the image display device. The central wavelength in the present invention means the central value of the wavelength region of the display light incident on the image display (for example, the average value of red light and blue light in the case of a color image display), and the total diffracted light. Means 0th order light and all diffracted light of ± 1st order or higher.

【0005】[0005]

【作用】2方向に格子パターンをもつ位相格子に平行光
を入射させると図2に示すような回折パターンが得られ
る。一方、本発明で用いられる液晶セル4はTV、VT
Rの映像信号等を受けて、画像を表示するもので、その
一例の概略平面図である図3に示すように、不透明な非
線形素子部11および配線部12を有している。したが
って、開口部(図中、斜線で示す)は一部分のみであ
る。該液晶セルとレンズとの間、またはレンズの目視者
側(すなわち、液晶セルとは反対側)に上記の位相格子
を配置すると、開口部を通過して該位相格子に入射した
光が回折作用により図2に示すように拡がることから、
不透明な非線形素子部11および配線部12による影が
目立たない。さらに、本発明における位相格子は、液晶
表示装置の中心波長(例えば、550nm)において、
0次光強度に対する(±1,0)次光等の強度および全
回折光の強度に対する0次光の強度等の合計が上記の特
定範囲にあることから、(1,1)次光、(1,−1)
次光、(−1,−1)次光および(−1,1)次光で囲
まれる領域の光の強度が高く、かつ同領域内において中
心部の明るさと周辺部の明るさとの比が適当であるた
め、コントラストの低下および画像のぼけを極めて低く
抑えることができる。
When parallel light is incident on a phase grating having a grating pattern in two directions, a diffraction pattern as shown in FIG. 2 is obtained. On the other hand, the liquid crystal cell 4 used in the present invention is a TV or a VT.
An image is displayed in response to a video signal of R or the like, and has an opaque nonlinear element section 11 and a wiring section 12, as shown in FIG. 3, which is a schematic plan view of an example thereof. Therefore, the opening (indicated by diagonal lines in the figure) is only a part. When the above-mentioned phase grating is arranged between the liquid crystal cell and the lens or on the viewer side of the lens (that is, on the side opposite to the liquid crystal cell), the light passing through the opening and incident on the phase grating diffracts. Because it spreads as shown in Figure 2,
The shadow of the opaque non-linear element portion 11 and the wiring portion 12 is inconspicuous. Furthermore, the phase grating according to the present invention has a central wavelength (for example, 550 nm) of the liquid crystal display device,
Since the sum of the intensities of the (± 1,0) order light with respect to the 0th order light intensity and the intensity of the 0th order light with respect to the intensity of all diffracted light is within the above specific range, the (1,1) order light, ( 1, -1)
The intensity of the light surrounded by the next light, the (−1, −1) th light, and the (−1,1) th light is high, and in the same region, the ratio of the brightness of the central portion to the brightness of the peripheral portion is high. Since it is suitable, it is possible to suppress the deterioration of the contrast and the blur of the image to be extremely low.

【0006】[0006]

【実施例】以下、本発明の実施例につき図1を参照して
詳細に説明する。図1は本発明の画像表示装置の一例の
概略構成図であって、バックライト(光源)1の光がア
クティブマトリクス形液晶セル4の背面側Rから照射さ
れる。この液晶セル4の前面側、つまり、画像表示光が
通る表示光路2には位相格子5が配置され、その前面側
Fにはレンズ群3が設けられており、目視者の目6によ
って、レンズ群3を通して液晶セル上の画像が目視され
る。バックライトとしては、ハロゲンランプ、キセノン
ランプ、メタルハライド、蛍光ランプなどのランプと拡
散板とを組み合わせたもの、上記ランプ、導光板および
拡散板を組み合わせたものが利用される。また、位相格
子5をレンズ群3の前面側Fに配置してもよい。
Embodiments of the present invention will be described in detail below with reference to FIG. FIG. 1 is a schematic configuration diagram of an example of an image display device of the present invention, in which light from a backlight (light source) 1 is emitted from a back side R of an active matrix type liquid crystal cell 4. A phase grating 5 is arranged on the front surface side of the liquid crystal cell 4, that is, on the display optical path 2 through which the image display light passes, and a lens group 3 is provided on the front surface side F thereof. The image on the liquid crystal cell is visible through group 3. As the backlight, a combination of a lamp such as a halogen lamp, a xenon lamp, a metal halide, a fluorescent lamp and a diffusion plate, or a combination of the above lamp, a light guide plate and a diffusion plate is used. Further, the phase grating 5 may be arranged on the front side F of the lens group 3.

【0007】ここで、格子の高さおよび形状を種々変え
ることにより作製した位相格子について、非線形素子部
や電極などの影による画質低下の解消と、画像コントラ
ストの影響とを比較検討した結果を表1に示す。表1よ
り、550nm(上記液晶表示装置の中心波長)におい
て、0次光の強度に対して、(±1,0)次光および
(0,±1)次光の強度がそれぞれ60〜180%の範
囲にあり、(±1,±1)次光の強度が20〜330%
の範囲にあり、かつ0次光の強度と(±1,0)次光、
(0,±1)次光および(±1,±1)次光の強度との
合計が、全回折光の強度に対して70%以上である場
合、非線形素子部や電極などの影による画質低下を解消
し、画像コントラストの低減割合を低くすることができ
る。
Here, the results of a comparative examination of elimination of image quality deterioration due to shadows of non-linear element parts and electrodes and the effect of image contrast are presented for phase gratings produced by variously changing the height and shape of the grating. Shown in 1. From Table 1, at 550 nm (center wavelength of the liquid crystal display device), the intensities of the (± 1,0) -order light and the (0, ± 1) -order light are 60 to 180% with respect to the intensity of the 0th-order light. And the intensity of the (± 1, ± 1) next light is 20 to 330%.
And the intensity of the 0th-order light and the (± 1,0) th-order light,
When the sum of the intensities of the (0, ± 1) order light and the (± 1, ± 1) order light is 70% or more of the intensity of the total diffracted light, the image quality due to the shadow of the non-linear element part or the electrode It is possible to eliminate the decrease and reduce the reduction rate of the image contrast.

【表1】 [Table 1]

【0008】本発明における2方向に格子パターンをも
つ位相格子の一例を図4に示す。図4に示す位相格子は
平板9上に凸部10がドット状に縦横に配列されてな
る。
FIG. 4 shows an example of a phase grating having a grating pattern in two directions according to the present invention. The phase grating shown in FIG. 4 comprises convex portions 10 arranged vertically and horizontally on a flat plate 9.

【0009】本発明における位相格子の他の一例の概略
斜視図を図5に示す。図5に示す位相格子は互いに直交
する2方向(X,Y)に格子パターンを有する。該位相
格子のX方向またはY方向に一致するI−(I)線断面
図を図6に示す。図6に示すように、該位相格子におけ
る各格子パターンの高さ(凸部と凹部の高さの差)hは
製造上等の誤差を除いて概ね一定である。ここで、X方
向の格子パターンの高さとY方向の格子パターンの高さ
とは必ずしも同一でなくてもよい。なお、該位相格子に
おける格子パターンの方向とは一致しない方向にも、一
定の高さを有する格子パターンが存在するかのようであ
るが、図7に示す、II−(II)線断面図より明らかなよ
うに、該位相格子のX方向およびY方向以外には一定の
格子高さを有する格子パターンが構成されない。
FIG. 5 shows a schematic perspective view of another example of the phase grating according to the present invention. The phase grating shown in FIG. 5 has a grating pattern in two directions (X, Y) orthogonal to each other. FIG. 6 shows a cross-sectional view of the phase grating taken along line I- (I) corresponding to the X direction or the Y direction. As shown in FIG. 6, the height (difference between the heights of the convex portion and the concave portion) h of each grating pattern in the phase grating is substantially constant except for manufacturing errors. Here, the height of the lattice pattern in the X direction and the height of the lattice pattern in the Y direction do not necessarily have to be the same. Incidentally, it seems that there is a grating pattern having a constant height in a direction that does not coincide with the direction of the grating pattern in the phase grating. From the II- (II) line sectional view shown in FIG. As is apparent, no grating pattern having a constant grating height is formed except in the X and Y directions of the phase grating.

【0010】なお、位相格子の格子パターンの方向は液
晶セルの画素に対して水平方向であっても、垂直方向で
あってもよく、画素の水平方向および垂直方向に対して
斜めであってもよい。また、2方向の格子パターンがな
す角度は90°に限られない。
The direction of the grating pattern of the phase grating may be horizontal or vertical to the pixels of the liquid crystal cell, or may be oblique to the horizontal and vertical directions of the pixels. Good. Further, the angle formed by the grid patterns in the two directions is not limited to 90 °.

【0011】本発明の画素表示装置としては、液晶表示
装置のほか、プラズマ・ディスプレイ・パネル(PD
P)、エレクトロルミネッセンス(EL)、LEDなど
が挙げられる。また、液晶表示装置の用途としては、ビ
ューファインダ、液晶プロジェクターなどが挙げられ
る。
As the pixel display device of the present invention, in addition to a liquid crystal display device, a plasma display panel (PD
P), electroluminescence (EL), LED and the like. Further, examples of applications of the liquid crystal display device include a viewfinder and a liquid crystal projector.

【0012】[0012]

【発明の効果】本発明の画像表示装置によれば、液晶セ
ルの液晶を駆動するための非線形素子部および画素電極
部の影などによる画質低下が低減され、しかもコントラ
ストの高い画像を得ることができる。
According to the image display device of the present invention, it is possible to obtain a high-contrast image in which the deterioration of the image quality due to the shadow of the non-linear element portion and the pixel electrode portion for driving the liquid crystal of the liquid crystal cell is reduced. it can.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の画像表示装置の一例を示す概略構成図
である。
FIG. 1 is a schematic configuration diagram showing an example of an image display device of the present invention.

【図2】2方向に格子パターンをもつ位相格子から得ら
れる回折パターンを示す図である。
FIG. 2 is a diagram showing a diffraction pattern obtained from a phase grating having a grating pattern in two directions.

【図3】本発明で用いられる液晶セルの概略平面図であ
る。
FIG. 3 is a schematic plan view of a liquid crystal cell used in the present invention.

【図4】本発明における位相格子の一例の概略斜視図で
ある。
FIG. 4 is a schematic perspective view of an example of a phase grating according to the present invention.

【図5】本発明における位相格子の他の一例の概略斜視
図である。
FIG. 5 is a schematic perspective view of another example of the phase grating according to the present invention.

【図6】図5に示す位相格子のI−(I)線断面図であ
る。
6 is a sectional view taken along the line I- (I) of the phase grating shown in FIG.

【図7】図5に示す位相格子のII−(II)線断面図であ
る。
7 is a sectional view taken along line II- (II) of the phase grating shown in FIG.

【符号の説明】[Explanation of symbols]

1 光源 2 表示光路 3 レンズ群 4 液晶セル 5 位相格子 6 観察者の眼 11 非線形素子部 12 配線部 F 前面側 R 背面側 DESCRIPTION OF SYMBOLS 1 light source 2 display optical path 3 lens group 4 liquid crystal cell 5 phase grating 6 observer's eye 11 nonlinear element section 12 wiring section F front side R rear side

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成5年4月16日[Submission date] April 16, 1993

【手続補正2】[Procedure Amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0004[Correction target item name] 0004

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0004】[0004]

【課題を解決するための手段】本発明によれば、上記目
的は、ドット状の画素が2次元的に多数配列された画像
表示器と、この画像表示器の表示光路に配置された、2
方向に格子パターンを持つ位相格子とを備え、上記画像
表示器の中心波長において、0次光の強度に対する(±
1,0)次光および(0,±1)次光の強度が60〜1
80%の範囲にあり、0次光の強度に対する(±1,±
1)次光の強度が20〜330%の範囲にあり、かつ0
次光の強度と(±1,0)次光、(0,±1)次光およ
び(±1,±1)次光の強度との合計が、全回折光の強
度に対して上記中心波長において70%以上であること
を特徴とする画像表示装置により達成される。なお、本
発明における中心波長とは、画像表示器から出射する表
示光の最短波長と最長波長との中心値(例えば、カラー
画像表示器であれば赤色光と青色光との平均値)をい
い、全回折光とは、0次光および±1次以上の全ての回
折光をいう。
According to the present invention, the above object is to provide an image display in which a large number of dot-shaped pixels are two-dimensionally arranged, and an image display arranged in the display optical path of the image display.
And a phase grating having a grating pattern in the direction, at the center wavelength of the image display device (±
The intensity of the (1,0) order light and the (0, ± 1) order light is 60 to 1
It is in the range of 80%, and it is (± 1, ±
1) The intensity of the next light is in the range of 20 to 330%, and 0
The sum of the intensity of the next light and the intensity of the (± 1,0) order light, the (0, ± 1) order light, and the (± 1, ± 1) order light is the above central wavelength with respect to the intensity of all diffracted light. Is 70% or more in the image display device. The center wavelength in the present invention means the center value of the shortest wavelength and the longest wavelength of the display light emitted from the image display (for example, the average value of red light and blue light in the case of a color image display). , Total diffracted light refers to 0th order light and all diffracted light of ± 1st order or higher.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ドット状の画素が2次元的に多数配列さ
れた画像表示器と、この画像表示器の表示光路に配置さ
れた、2方向に格子パターンを持つ位相格子とを備え、
上記画像表示器の中心波長において、0次光の強度に対
する(±1,0)次光および(0,±1)次光の強度が
60〜180%の範囲にあり、0次光の強度に対する
(±1,±1)次光の強度が20〜330%の範囲にあ
り、かつ0次光の強度と(±1,0)次光、(0、±
1)次光および(±1,±1)次光の強度との合計が、
全回折光の強度に対して上記中心波長において70%以
上であることを特徴とする画像表示装置。
1. An image display device having a plurality of dot-shaped pixels arranged two-dimensionally, and a phase grating having a grating pattern in two directions, which is arranged in a display optical path of the image display device,
At the center wavelength of the image display, the intensity of the (± 1,0) -order light and the intensity of the (0, ± 1) -order light with respect to the intensity of the 0th-order light are in the range of 60 to 180%, and the intensity of the 0th-order light is The intensity of the (± 1, ± 1) th order light is in the range of 20 to 330%, and the intensity of the 0th order light and the (± 1,0) th order light, (0, ±
1) The sum of the intensities of the next light and (± 1, ± 1) next light is
An image display device, wherein the intensity of all diffracted light is 70% or more at the central wavelength.
JP5074455A 1992-04-28 1993-03-31 Image display device Expired - Fee Related JP2843479B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5074455A JP2843479B2 (en) 1993-03-31 1993-03-31 Image display device
KR1019930006892A KR0120397B1 (en) 1992-04-28 1993-04-23 Image display apparatus
EP93106795A EP0567995A1 (en) 1992-04-28 1993-04-27 Image display apparatus
US08/052,832 US5513025A (en) 1992-04-28 1993-04-27 Image display apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5074455A JP2843479B2 (en) 1993-03-31 1993-03-31 Image display device

Publications (2)

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JPH06324316A true JPH06324316A (en) 1994-11-25
JP2843479B2 JP2843479B2 (en) 1999-01-06

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JP5074455A Expired - Fee Related JP2843479B2 (en) 1992-04-28 1993-03-31 Image display device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170065484A (en) * 2014-06-13 2017-06-13 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Optical stacks for sparkle reduction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170065484A (en) * 2014-06-13 2017-06-13 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Optical stacks for sparkle reduction
JP2017520789A (en) * 2014-06-13 2017-07-27 スリーエム イノベイティブ プロパティズ カンパニー Optical stack for sparkle reduction
US10353214B2 (en) 2014-06-13 2019-07-16 3M Innovative Properties Company Optical stacks for sparkle reduction

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