JPH04136925A - Liquid crystal projector - Google Patents
Liquid crystal projectorInfo
- Publication number
- JPH04136925A JPH04136925A JP2261979A JP26197990A JPH04136925A JP H04136925 A JPH04136925 A JP H04136925A JP 2261979 A JP2261979 A JP 2261979A JP 26197990 A JP26197990 A JP 26197990A JP H04136925 A JPH04136925 A JP H04136925A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video
- circuit
- projected
- liquid crystal
- 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 18
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 10
- 230000003321 amplification Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Projection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
Ｌ棗し９秤址分兄
本発明は投写面の色によって拡大投写される映像の色合
いが変化しないようにした液晶プロジェクタに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal projector in which the hue of an enlarged and projected image does not change depending on the color of the projection surface.
従来の技術
従来、液晶プロジェクタは液晶表示パネルに映し出され
る映像、例えば赤色．緑色，青色用の３枚の各液晶表示
パネルに映し出される単色映像を合成して、それ専用の
スクリーン上に拡大投写しカラー映像を得るようにして
おり、そのカラー映像の色合いは専用のスクリーンに合
わせて調整されていた。BACKGROUND OF THE INVENTION Conventionally, liquid crystal projectors have been used to display images projected on a liquid crystal display panel, such as red. The monochromatic images projected on each of the three liquid crystal display panels for green and blue are combined and enlarged and projected onto a dedicated screen to obtain a color image. It was adjusted accordingly.
発明が解決しようとする課題
そのため、斯る従来の液晶プロジェクタでは、専用スク
リーン以外の例えば色付き壁面等に映像を拡大投写した
場合、その壁面（投写面）の色によって投写した映像の
色合いが変化して正しい色の映像が得られないと云った
問題を生していた。Problems to be Solved by the Invention Therefore, in such a conventional liquid crystal projector, when an image is enlarged and projected onto a colored wall surface other than a dedicated screen, the hue of the projected image changes depending on the color of the wall surface (projection surface). This caused the problem that images with the correct colors could not be obtained.
本発明はこのような点に鑑み成されたものであって、投
写面の色の影響を受けることなく正しい色の映像が得ら
れるようにした液晶プロジェクタを提供することを目的
とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal projector that can provide images of correct colors without being affected by the color of the projection surface.
課題を解決するための手段
上記した目的を達成するため本発明では、液晶表示パネ
ルに映し出される映像を拡大投写する投写部を有する液
晶プロジェクタにおいて、その投写面の色に応じて投写
される映像の色合いを補正する補正手段を設けたもので
、具体的には前記補正手段を、色合い補正時に通常の映
像信号に替えて基準ホワイト信号を投写部に供給する基
準信号発生回路と、基準ホワイト信号に基づく投写面か
らの反射光を受けて投写面の色を感知するセンサーと、
センサーで感知した色に応じて投写部に供給される映像
信号のレベル補正を行なう補正回路とより構成したもの
である。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a liquid crystal projector that has a projection section that enlarges and projects an image displayed on a liquid crystal display panel. The device is equipped with a correction means for correcting the hue, and specifically, the correction means is provided with a reference signal generation circuit that supplies a reference white signal to the projection unit in place of a normal video signal during hue correction, and a reference white signal that is a sensor that detects the color of the projection surface by receiving reflected light from the projection surface,
It is composed of a correction circuit that corrects the level of the video signal supplied to the projection unit according to the color detected by the sensor.
昨−月一
このような構成によれば、色合い補正時には基準信号発
生手段からの基準ボワイ１〜信号が投写部に供給され、
センサーで感知した投写面の色に応じたレベル補正が補
正回路でなされることになる。According to such a configuration, the reference bow 1 signal from the reference signal generating means is supplied to the projection unit during hue correction,
A correction circuit performs level correction according to the color of the projection surface detected by the sensor.
実施イ舛
以下、本発明の液晶プロジェクタについて図面と共に説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The liquid crystal projector of the present invention will be described below with reference to the drawings.
図における（１）は受信アンテナ或いはビデオ等の外部
機器からの通常の映像信号を信号処理して（この場合、
赤、緑、青の三原色信号にして）出力する映像信号回路
、（２）は色合い調整のための基準ボワイＩ・信号を出
力する基準信号発生回路、（３）は色合い補正時に映像
信号回路（１）からの通常の映像信号に替えて基準信号
発生回路（２）からの基準ホワイト信号（即ち、白色の
合成光が得られる三原色信号）を出力する映像切換回路
、（４）は映像切換回路（３）からの通常の映像信号或
いは基準ホワイト信号を増幅して出力する映像出力回路
、（５）は映像出力回路（４）から通常の映像信号或い
は基準ホワイＩ・信号が供給される投写部で、該投写部
（５）は光源からの赤色、緑色、青色光を赤色、緑色、
青色用の各液晶表示パネルで夫々映像信号或いは基準ホ
ワイト信号に応じて変調し、その合成光を投射レンズ部
で投写面（６）に拡大投写するようになっている。（７
）は色合い補正時に投写面（６）で反射された投写部（
５）からの投射光を受けて投写面（６）の色を感知する
センサー、（８）はセンサー（７）から入力される信号
（即ち、反射光から得られる基準ホワイト信号）と基準
信号発生回路（２）からの基準ホワイト信号とをレベル
比較しその比較結果に応じた補正信号を映像出力回路（
４）に出力し映像出力回路（４）から出力される映像信
号のレベル補正を行なわせる補正回路で、該補正回路（
８）はセンサー（７）からの基準ホワイト信号と基準信
号発生回路（８）からの基準ホワイト信号とのレベル差
が無くなると補正終了信号を出力するようになっている
。（９）は補正スイッチ（１０）をＯＮ操作した色合い
補正時にセンサー（７）及び補正回路（８）を動作状態
に設定して映像切換回路（３）を基準ホワイト信号の出
力状態にし、補正終了時には補正回路（８）からの補正
終了信号を受けてセンサー（７）及び補正回路（８）を
非動作状態に設定して映像切換回路（３）を通常の映像
信号の出力状態にする制御信号を出力する補正切換回路
である。(1) in the figure is signal processing of a normal video signal from a receiving antenna or an external device such as a video (in this case,
(2) is a reference signal generation circuit that outputs a reference bow I signal for tint adjustment; (3) is a video signal circuit that outputs the three primary color signals of red, green, and blue (red, green, and blue); (3) is a video signal circuit ( (4) is a video switching circuit that outputs a reference white signal (i.e., three primary color signals from which white composite light is obtained) from the reference signal generation circuit (2) in place of the normal video signal from 1); (3) is a video output circuit that amplifies and outputs the normal video signal or reference white signal from the video output circuit (4), and (5) is a projection unit to which the normal video signal or reference white I signal is supplied from the video output circuit (4). The projection unit (5) converts the red, green, and blue light from the light source into red, green, and
Each blue liquid crystal display panel modulates the light according to a video signal or a reference white signal, and the combined light is enlarged and projected onto a projection surface (6) by a projection lens section. (7
) is the projection area (
5) A sensor that detects the color of the projection surface (6) by receiving the projected light from the sensor (8), which generates a signal input from the sensor (7) (i.e., a reference white signal obtained from the reflected light) and a reference signal. The level is compared with the reference white signal from the circuit (2), and a correction signal according to the comparison result is sent to the video output circuit (
4) and performs level correction of the video signal output from the video output circuit (4).
8) outputs a correction end signal when there is no difference in level between the reference white signal from the sensor (7) and the reference white signal from the reference signal generation circuit (8). (9) sets the sensor (7) and correction circuit (8) to the operating state when the correction switch (10) is turned ON to perform color correction, and the video switching circuit (3) is set to the output state of the reference white signal, and the correction is completed. A control signal that sometimes receives a correction end signal from the correction circuit (8), sets the sensor (7) and the correction circuit (8) to a non-operating state, and puts the video switching circuit (3) in a normal video signal output state. This is a correction switching circuit that outputs .
従って、投写面（６）に通常の映像信号に基づく映像を
映し出している状態で、補正スイッチ（１０）をＯＮ操
作すると、補正切換回路（９）より制御信号が出力され
てセンサ゛−（７）及び補正回路（８）が動作状態にな
ると共に映像切換回路（３）が通常の映像信号に替えて
基準ホワイト信号を出力する状態に切り換わり、映像出
力回路（４）を通じて投写部（５）より投写面（６）に
拡大投写されることになる。そして、この投写面（６）
で反射された投写部（５）からの投射光を受けることで
得られるセンサー（５）からの基準ホワイト信号と基準
信号発生回路（２）からの基準ポヮイ１〜信号とが補正
回路（８）で比較され、その比較結果に応じた補正信号
が映像出力回路（４）に出力されることになる。例えば
、投写面（６）が赤色の場合には、センサー（７）から
得られる基準ホワイト信号の赤色のレベルの方が大きく
なるため、映像出力回路（４）から出力される基準ホワ
イト信号の赤色レベルが映像用゛力回路（４）の増幅度
を調整することで、即ち赤色レベルの増幅度を小さくす
ることで補正されることになる。そして、補正後に得ら
れるセンサー（７）からの基準ホワイト信号と基準信号
発生回路（２）からの基準ホワイト信号とが再び比較さ
れ、両信号が同レベルになるまで補正が繰り返されるこ
とになる。そして、センサー（７）から得られる基準ホ
ワイト信号と基準信号発生回路（２）からの基準ホワイ
ト信号とのレベル差が無くなると補正を終了して、補正
終了信号が補正回路（８）から補正切換回路（９）に出
力され、補正切換回路（９）よりそれに基づく制御信号
が出力され、センサー（７）及び補正回路（８）が非動
作状態に設定されると共に、映像切換回路（３）が再び
通常の映像信号を出力する状態に切り換えられる。これ
により、映像出力回路（４）を通じてその投写面の色（
この場合、赤）のレベルが小さくされた映像信号が投写
部（５）に供給されることになり、投写面（６）にはそ
の色の影響を受けない映像が映し出されることになる。Therefore, when the correction switch (10) is turned on while an image based on a normal image signal is being projected on the projection surface (6), a control signal is output from the correction switching circuit (9) and the sensor At the same time that the correction circuit (8) becomes operational, the video switching circuit (3) switches to a state where it outputs a reference white signal instead of the normal video signal, and from the projection unit (5) through the video output circuit (4). The image will be enlarged and projected onto the projection surface (6). And this projection surface (6)
The reference white signal from the sensor (5) obtained by receiving the projection light from the projection unit (5) reflected by the reference point 1~signal from the reference signal generation circuit (2) is sent to the correction circuit (8). A correction signal corresponding to the comparison result is output to the video output circuit (4). For example, when the projection surface (6) is red, the red level of the reference white signal obtained from the sensor (7) is higher, so the red level of the reference white signal output from the video output circuit (4) is higher. The level is corrected by adjusting the amplification degree of the video power circuit (4), that is, by reducing the amplification degree of the red level. Then, the reference white signal from the sensor (7) obtained after correction and the reference white signal from the reference signal generation circuit (2) are compared again, and the correction is repeated until both signals are at the same level. Then, when there is no difference in level between the reference white signal obtained from the sensor (7) and the reference white signal from the reference signal generation circuit (2), the correction is finished, and the correction end signal is sent from the correction circuit (8) to switch the correction. The correction switching circuit (9) outputs a control signal based on the signal, the sensor (7) and the correction circuit (8) are set to a non-operating state, and the video switching circuit (3) is set to a non-operating state. The state is switched back to outputting a normal video signal. As a result, the color of the projection surface (
In this case, a video signal with a lower level (red) is supplied to the projection unit (5), and an image that is not affected by the color is projected on the projection surface (6).
見所（２）Ａ来
、」二連した如く本発明の液晶プロジェクタに依れば、
その投写面の色に応じて投写される映像の色合いを補正
するようにしているので、投写面の色の影響を受けない
適正な色の映像を映し出すことが出来る。Highlights (2) As stated above, according to the liquid crystal projector of the present invention,
Since the hue of the projected image is corrected according to the color of the projection surface, it is possible to project an image with an appropriate color that is not affected by the color of the projection surface.
図は、本発明液晶プロジェクタのブロック構成例である
。
（２）−基準信号発生回路
（３）−映像切換回路、 （４）−投写部（６） −−
投写面、 （７） −センサー（８）−補正回路。The figure shows an example of the block configuration of the liquid crystal projector of the present invention. (2) - Reference signal generation circuit (3) - Video switching circuit, (4) - Projection section (6) --
Projection surface, (7) - sensor (8) - correction circuit.
Claims (2)
映し出される映像を拡大投写する投写部を有する液晶プ
ロジェクタにおいて、その投写面の色に応じて投写され
る映像の色合いを補正する補正手段を設けたことを特徴
とする液晶プロジェクタ。(1) In a liquid crystal projector that has a projection unit that enlarges and projects an image displayed on a liquid crystal display panel based on a supplied video signal, a correction means that corrects the hue of the projected image according to the color of the projection surface is provided. A liquid crystal projector characterized by:
に替えて基準ホワイト信号を投写部に供給する基準信号
発生回路と、基準ホワイト信号に基づく投写面からの反
射光を受けて投写面の色を感知するセンサーと、センサ
ーで感知した色に応じて投写部に供給される映像信号の
レベル補正を行なう補正回路とより成ることを特徴とす
る第１請求項に記載の液晶プロジェクタ。(2) The correction means includes a reference signal generation circuit that supplies a reference white signal to the projection unit in place of a normal video signal during hue correction, and a reference signal generation circuit that receives reflected light from the projection surface based on the reference white signal and 2. The liquid crystal projector according to claim 1, comprising: a sensor that detects color; and a correction circuit that corrects the level of the video signal supplied to the projection unit according to the color detected by the sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2261979A JPH04136925A (en) | 1990-09-28 | 1990-09-28 | Liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2261979A JPH04136925A (en) | 1990-09-28 | 1990-09-28 | Liquid crystal projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04136925A true JPH04136925A (en) | 1992-05-11 |
Family
ID=17369321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2261979A Pending JPH04136925A (en) | 1990-09-28 | 1990-09-28 | Liquid crystal projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04136925A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002097784A1 (en) * | 2001-05-31 | 2002-12-05 | Seiko Epson Corporation | Image display system, projector, information storage medium and image processing method |
| US6990234B2 (en) | 2000-09-13 | 2006-01-24 | Seiko Epson Corporation | Correction curve generating method, image processing method, image display unit, and storage medium |
| JP2006109380A (en) * | 2004-10-08 | 2006-04-20 | Sharp Corp | Projection image color adjusting method and projector |
| JP2006140839A (en) * | 2004-11-12 | 2006-06-01 | Sharp Corp | Projector |
| US7079155B2 (en) | 2002-03-18 | 2006-07-18 | Seiko Epson Corporation | Image display device, image processing method, program, and storage medium |
| US7110002B2 (en) | 2000-05-08 | 2006-09-19 | Seiko Epson Corporation | Image displaying system of environment-adaptive type, presentation system, and image processing method and program |
| JP2006251140A (en) * | 2005-03-09 | 2006-09-21 | Matsushita Electric Ind Co Ltd | Projection device |
| US7170634B2 (en) | 2001-03-06 | 2007-01-30 | Seiko Epson Corporation | Picture display system, picture data processing method, and program for performing color correction of output pictures |
| US7284867B2 (en) | 2003-12-25 | 2007-10-23 | Funai Electric Co., Ltd. | Projector |
| JP2007322671A (en) * | 2006-05-31 | 2007-12-13 | Research Organization Of Information & Systems | Projection image correction system and correction information generation program |
| US7595811B2 (en) | 2001-07-26 | 2009-09-29 | Seiko Epson Corporation | Environment-complaint image display system, projector, and program |
| JP2011013443A (en) * | 2009-07-01 | 2011-01-20 | Canon Inc | Image display device, control method thereof, and program thereof |
-
1990
- 1990-09-28 JP JP2261979A patent/JPH04136925A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7110002B2 (en) | 2000-05-08 | 2006-09-19 | Seiko Epson Corporation | Image displaying system of environment-adaptive type, presentation system, and image processing method and program |
| US6990234B2 (en) | 2000-09-13 | 2006-01-24 | Seiko Epson Corporation | Correction curve generating method, image processing method, image display unit, and storage medium |
| US7170634B2 (en) | 2001-03-06 | 2007-01-30 | Seiko Epson Corporation | Picture display system, picture data processing method, and program for performing color correction of output pictures |
| US7542055B2 (en) | 2001-05-31 | 2009-06-02 | Seiko Epson Corporation | Image display system, projector, information storage medium, and image processing method |
| WO2002097784A1 (en) * | 2001-05-31 | 2002-12-05 | Seiko Epson Corporation | Image display system, projector, information storage medium and image processing method |
| CN100346651C (en) * | 2001-05-31 | 2007-10-31 | 精工爱普生株式会社 | Image display system, projector, information storage medium and image processing method |
| US7986332B2 (en) | 2001-07-26 | 2011-07-26 | Seiko Epson Corporation | Environment-compliant image display system, projector, and program |
| US7595811B2 (en) | 2001-07-26 | 2009-09-29 | Seiko Epson Corporation | Environment-complaint image display system, projector, and program |
| US7079155B2 (en) | 2002-03-18 | 2006-07-18 | Seiko Epson Corporation | Image display device, image processing method, program, and storage medium |
| US7284867B2 (en) | 2003-12-25 | 2007-10-23 | Funai Electric Co., Ltd. | Projector |
| JP2006109380A (en) * | 2004-10-08 | 2006-04-20 | Sharp Corp | Projection image color adjusting method and projector |
| JP2006140839A (en) * | 2004-11-12 | 2006-06-01 | Sharp Corp | Projector |
| JP2006251140A (en) * | 2005-03-09 | 2006-09-21 | Matsushita Electric Ind Co Ltd | Projection device |
| JP2007322671A (en) * | 2006-05-31 | 2007-12-13 | Research Organization Of Information & Systems | Projection image correction system and correction information generation program |
| JP2011013443A (en) * | 2009-07-01 | 2011-01-20 | Canon Inc | Image display device, control method thereof, and program thereof |
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