JPH0375617A - Liquid crystal projector - Google Patents
Liquid crystal projectorInfo
- Publication number
- JPH0375617A JPH0375617A JP1213417A JP21341789A JPH0375617A JP H0375617 A JPH0375617 A JP H0375617A JP 1213417 A JP1213417 A JP 1213417A JP 21341789 A JP21341789 A JP 21341789A JP H0375617 A JPH0375617 A JP H0375617A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- angle
- condenser lens
- contrast
- inclination
- 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.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 230000000007 visual effect Effects 0.000 abstract 4
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
PURPOSE:To obtain a high contrast by disposing a liquid crystal panel with inclination by as much as the angle corresponding to a preferential visual angle with respect to the optical central axis of an optical path and disposing a condenser lens so as to intersect approximately orthogonally with the central axis. CONSTITUTION:The liquid crystal panel 9 is disposed in the optical path from a light source 3 to a projecting lens 23 with the inclination by as much as the angle theta corresponding to the preferential visual angle and the condenser lens 7 is disposed to intersect approximately orthogonally with the central axis. The contrast is maximized at about 0 deg. angle of inclination when the contrast of a screen is observed while the angle of inclination of the condenser lens 7 is gradually lessened from the preferential visual angle and while the liquid crystal panel 9 is held set at the preferential visual angle. The contrast of the screen is improved in this way and the high performance as the projector for which the large-sized screen is used is obtd.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、スリーンに映像を投写するプロジェクタ−に
於いて、画像表示素子として液晶を用いた液晶プロジェ
クタ−に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid crystal projector that uses liquid crystal as an image display element in a projector that projects images onto a screen.
（従来の技術）
斯種液晶プロジェクタ−に於いて、画面のコントラスト
を改善するために、第４図の如く光源（２５）から投写
レンズ（２８）へ至る光路中に、液晶表示装置 （２６
）及びコンデンサレンズ（２７）を傾けて配置した液晶
プロジェクタ−（２４）が提案されている（例えば実開
昭６４−３０９７８ ［ＨＯ４Ｎ５／７４］ ）。(Prior Art) In this type of liquid crystal projector, in order to improve the contrast of the screen, a liquid crystal display device (26) is installed in the optical path from the light source (25) to the projection lens (28) as shown in FIG.
) and a liquid crystal projector (24) in which a condenser lens (27) is arranged at an angle has been proposed (for example, Utility Model Application Publication No. 64-30978 [HO4N5/74]).
この様に液晶表示装置（２６）及びコンデンサレンズ（
２７）を傾けるのは、これによって画面のコントラスト
が改善されるという液晶表示パネル固有の性質があるか
らである。この傾斜角度は「優先視野角」或は「適正視
野角」と呼ばれ、一般に３°〜６°の範囲に設定される
。In this way, the liquid crystal display device (26) and the condenser lens (
27) is tilted because there is a property inherent in liquid crystal display panels that the contrast of the screen is improved by tilting the screen. This angle of inclination is called a "priority viewing angle" or "appropriate viewing angle" and is generally set in a range of 3° to 6°.
（解決しようとする課題）
しかし前記優先視野角を設定した場合でも、大形スクリ
ーンに映像を投写する液晶プロジェクタ−に於いては、
依然としてコントラストが不十分である問題があった。(Problem to be solved) However, even when the above-mentioned priority viewing angle is set, in a liquid crystal projector that projects images on a large screen,
There was still a problem of insufficient contrast.
本発明の目的は、従来よりも更にコントラストを改善出
来る液晶プロジェクタ−を提供することである。An object of the present invention is to provide a liquid crystal projector that can further improve contrast than conventional ones.
（課題を解決する為の手段）(Means for solving problems)
Claims (1)
に、液晶パネル（９）の両側に一対の偏向フィルター（
８）（１０）を配備してなる液晶表示装置と、コンデン
サレンズ（７）とを配備した液晶プロジェクターに於い
て、液晶パネル（９）は、前記光路の光学的中心軸に対
して優先視野角に応じた角度θだけ傾けて配置すると共
に、コンデンサレンズ（７）は、前記中心軸に略直交さ
せて配置したことを特徴とする液晶プロジェクター。(1) In the optical path from the light source (3) to the projection lens (23), a pair of polarizing filters (
8) In a liquid crystal projector equipped with a liquid crystal display device equipped with (10) and a condenser lens (7), the liquid crystal panel (9) has a preferential viewing angle with respect to the optical center axis of the optical path. A liquid crystal projector, characterized in that the condenser lens (7) is arranged at an angle θ corresponding to the central axis, and the condenser lens (7) is arranged substantially perpendicular to the central axis.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1213417A JPH0375617A (en) | 1989-08-17 | 1989-08-17 | Liquid crystal projector |
| DE69030537T DE69030537T2 (en) | 1989-07-20 | 1990-07-19 | Liquid crystal projector |
| EP90113877A EP0409246B1 (en) | 1989-07-20 | 1990-07-19 | Liquid crystal projector |
| KR1019900011059A KR0138759B1 (en) | 1989-07-20 | 1990-07-20 | Liquid crystal projector |
| US07/885,693 US5473339A (en) | 1989-07-20 | 1992-05-19 | Liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1213417A JPH0375617A (en) | 1989-08-17 | 1989-08-17 | Liquid crystal projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0375617A true JPH0375617A (en) | 1991-03-29 |
Family
ID=16638882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1213417A Pending JPH0375617A (en) | 1989-07-20 | 1989-08-17 | Liquid crystal projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0375617A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0659234A (en) * | 1992-08-06 | 1994-03-04 | Fujitsu Ltd | Projection type liquid crystal display |
| US5371559A (en) * | 1991-11-15 | 1994-12-06 | Matsushita Electric Industrial Co., Ltd. | Light valve image projection apparatus |
| US5612797A (en) * | 1994-05-14 | 1997-03-18 | U.S. Philips Corporation | Liquid crystal projection display systems |
| JP2008233145A (en) * | 2007-03-16 | 2008-10-02 | Seiko Epson Corp | Projector |
| JP2009282553A (en) * | 2009-09-01 | 2009-12-03 | Seiko Epson Corp | Projector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61220811A (en) * | 1985-03-28 | 1986-10-01 | Asahi Glass Co Ltd | Manufacture of composite plastic |
| JPS623227A (en) * | 1985-06-28 | 1987-01-09 | Seikosha Co Ltd | Projection type liquid crystal display device |
| JPS6271921A (en) * | 1985-09-25 | 1987-04-02 | Casio Comput Co Ltd | Liquid crystal projector |
| JPS62186225A (en) * | 1986-02-10 | 1987-08-14 | Sony Corp | Projector |
| JPS6373782A (en) * | 1986-09-16 | 1988-04-04 | Sony Corp | Projector |
| JPS63314519A (en) * | 1987-06-18 | 1988-12-22 | Canon Inc | Display device |
-
1989
- 1989-08-17 JP JP1213417A patent/JPH0375617A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61220811A (en) * | 1985-03-28 | 1986-10-01 | Asahi Glass Co Ltd | Manufacture of composite plastic |
| JPS623227A (en) * | 1985-06-28 | 1987-01-09 | Seikosha Co Ltd | Projection type liquid crystal display device |
| JPS6271921A (en) * | 1985-09-25 | 1987-04-02 | Casio Comput Co Ltd | Liquid crystal projector |
| JPS62186225A (en) * | 1986-02-10 | 1987-08-14 | Sony Corp | Projector |
| JPS6373782A (en) * | 1986-09-16 | 1988-04-04 | Sony Corp | Projector |
| JPS63314519A (en) * | 1987-06-18 | 1988-12-22 | Canon Inc | Display device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371559A (en) * | 1991-11-15 | 1994-12-06 | Matsushita Electric Industrial Co., Ltd. | Light valve image projection apparatus |
| JPH0659234A (en) * | 1992-08-06 | 1994-03-04 | Fujitsu Ltd | Projection type liquid crystal display |
| US5612797A (en) * | 1994-05-14 | 1997-03-18 | U.S. Philips Corporation | Liquid crystal projection display systems |
| JP2008233145A (en) * | 2007-03-16 | 2008-10-02 | Seiko Epson Corp | Projector |
| JP4572347B2 (en) * | 2007-03-16 | 2010-11-04 | セイコーエプソン株式会社 | projector |
| JP2009282553A (en) * | 2009-09-01 | 2009-12-03 | Seiko Epson Corp | Projector |
| JP4572358B2 (en) * | 2009-09-01 | 2010-11-04 | セイコーエプソン株式会社 | projector |
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