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JP4518764B2 - Projection-type image display device - Google Patents
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JP4518764B2 - Projection-type image display device - Google Patents

Projection-type image display device Download PDF

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JP4518764B2
JP4518764B2 JP2003301808A JP2003301808A JP4518764B2 JP 4518764 B2 JP4518764 B2 JP 4518764B2 JP 2003301808 A JP2003301808 A JP 2003301808A JP 2003301808 A JP2003301808 A JP 2003301808A JP 4518764 B2 JP4518764 B2 JP 4518764B2
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luminance
projection
image
projected
brightness
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JP2005070549A (en
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信和 細矢
ひとみ 高橋
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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  • Projection Apparatus (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Controls And Circuits For Display Device (AREA)

Description

本発明は、液晶プロジェクタ、DLP等の投射型映像表示装置に関するものである。   The present invention relates to a projection-type image display device such as a liquid crystal projector and a DLP.

液晶プロジェクタにおいて、スクリーンに投影される映像の明るさは、部屋の明るさ(周辺輝度)によって大きく左右される。たとえば、周辺輝度が高い場合には、投射映像の明度が飛んでしまうため、投射映像は全体的に明度が下がったように見える。逆に、周辺輝度が低い場合には、投射映像は明度が上がったように見える。   In a liquid crystal projector, the brightness of an image projected on a screen greatly depends on the brightness of the room (peripheral brightness). For example, when the peripheral luminance is high, the brightness of the projected video is skipped, so that the projected video appears to have a reduced brightness overall. Conversely, when the peripheral brightness is low, the projected image appears to have increased brightness.

この発明は、周辺輝度に応じて、投射映像の明度を自動的に調整することができる投射型映像表示装置を提供することを目的とする。   An object of the present invention is to provide a projection-type image display device that can automatically adjust the brightness of a projection image according to the peripheral luminance.

請求項1に記載の発明は、投射面上の輝度を検出する輝度検出器を備え、前記投射面上に投射映像を投射する投射型映像表示装置において、前記輝度検出器は前記投写映像の幅よりも検出幅を広くする広角レンズを前記輝度検出器と前記投射面との間にさらに備え、前記輝度検出器は投射型映像表装置本体の前面に前向きに設けられ、前記輝度検出器は前記投射面上に投射された映像の内側の輝度と外側の輝度を検出し、前記輝度検出器によって検出された前記投射面上に投射された映像の外側の輝度に基づいて、投射する映像の輝度を制御する制御手段を備えていることを特徴とする。 The invention described in claim 1 is provided with a luminance detector for detecting the luminance on the projection surface, and the projection detector displays a projected image on the projection surface. The luminance detector has a width of the projected image. A wide-angle lens that makes the detection width wider than that between the luminance detector and the projection surface, the luminance detector is provided forward on the front surface of the projection type video display device body, and the luminance detector The brightness of the image to be projected is detected based on the brightness of the outside of the image projected on the projection surface detected by the brightness detector by detecting the brightness inside and outside the image projected on the projection surface. It has the control means which controls this.

この発明によれば、周辺輝度に応じて、投射映像の明度を自動的に調整することができるようになる。   According to the present invention, the brightness of the projected image can be automatically adjusted according to the peripheral luminance.

以下、図面を参照して、この発明を液晶プロジェクタに適用した場合の実施例について説明する。   Embodiments in which the present invention is applied to a liquid crystal projector will be described below with reference to the drawings.

図1は、液晶プロジェクタの構成を示している。   FIG. 1 shows the configuration of a liquid crystal projector.

入力映像信号は、A/D変換器1を介して、映像信号処理回路2に送られる。映像信号処理回路2は、フレームメモリ3を備えている。映像信号処理回路2では、輝度補正処理の他、スケーリング処理、ガンマ補正処理等が行われる。映像信号処理回路2によって得られた信号は、図示しない表示パネルに送られる。   The input video signal is sent to the video signal processing circuit 2 via the A / D converter 1. The video signal processing circuit 2 includes a frame memory 3. In the video signal processing circuit 2, scaling processing, gamma correction processing, and the like are performed in addition to luminance correction processing. The signal obtained by the video signal processing circuit 2 is sent to a display panel (not shown).

この液晶プロジェクタは、CPU10によって制御される。CPU10は、図示しないROM、RAMを備えている。また、この液晶プロジェクタには、輝度補正に用いられる単色ラインセンサ12が設けられている。単色ラインセンサ12は、CPU10に接続されている。   This liquid crystal projector is controlled by the CPU 10. The CPU 10 includes a ROM and a RAM (not shown). Further, the liquid crystal projector is provided with a monochromatic line sensor 12 used for luminance correction. The monochromatic line sensor 12 is connected to the CPU 10.

単色ラインセンサ12は、図2に示すように、液晶プロジェクタ本体の前面に、前向きで設けられている。また、単色ラインセンサ12としては、この例では、図3に示すように、中央部においてセンサ密度が高く両端部においてセンサ密度が低いノンリニア・ラインセンサが用いられている。単色ラインセンサ12の前側には、図4に示すように、広角レンズ13が設けられており、検出幅を広くしている。   As shown in FIG. 2, the monochromatic line sensor 12 is provided on the front surface of the liquid crystal projector body so as to face forward. As the monochromatic line sensor 12, in this example, as shown in FIG. 3, a non-linear line sensor having a high sensor density at the center and a low sensor density at both ends is used. As shown in FIG. 4, a wide-angle lens 13 is provided on the front side of the monochromatic line sensor 12 to increase the detection width.

図4に示すように、単色ラインセンサ12は、スクリーン20上に投射された映像30の内側の輝度と、映像の外側の輝度(周辺輝度)とを測定することが可能となっている。映像内部の輝度は、映像外部の輝度に比べて非常に大きいので、投射映像の内側の輝度と、映像の外側の輝度(周辺輝度)とを測定することが可能である。CPU10は、単色ラインセンサ12によって検出された周辺輝度に基づいて、映像信号処理回路2内の輝度補正回路を制御する。つまり、CPU10は、単色ラインセンサ12によって検出された周辺輝度が高い場合には、映像信号の輝度が高くなり、検出された周辺輝度が低い場合には映像信号の輝度を低くなるように、輝度補正回路を制御する。   As shown in FIG. 4, the monochromatic line sensor 12 can measure the brightness inside the image 30 projected on the screen 20 and the brightness outside the image (peripheral brightness). Since the brightness inside the video is much larger than the brightness outside the video, it is possible to measure the brightness inside the projected video and the brightness outside the video (peripheral brightness). The CPU 10 controls the luminance correction circuit in the video signal processing circuit 2 based on the peripheral luminance detected by the monochrome line sensor 12. That is, the CPU 10 increases the luminance of the video signal when the peripheral luminance detected by the monochrome line sensor 12 is high, and decreases the luminance of the video signal when the detected peripheral luminance is low. Control the correction circuit.

したがって、周辺輝度が高い場合には、映像信号はその輝度が高くなるように補正されるので、コントラスト比が高くなり、投射映像が明瞭に見えるようになる。一方、周辺輝度が低い場合には、映像信号はその輝度が低くなるように補正されるので、コントラスト比が下がり、投射映像は鑑賞に適したものとなる。   Therefore, when the peripheral luminance is high, the video signal is corrected so that the luminance is high, so that the contrast ratio is high and the projected video can be seen clearly. On the other hand, when the peripheral brightness is low, the video signal is corrected so that the brightness is low, so that the contrast ratio is lowered and the projected video is suitable for viewing.

液晶プロジェクタの電気的構成を示すブロック図である。It is a block diagram which shows the electric constitution of a liquid crystal projector. 液晶プロジェクタ本体の正面図である。It is a front view of a liquid-crystal projector main body. 単色ラインセンサの構成を示す拡大正面図である。It is an enlarged front view which shows the structure of a monochromatic line sensor. 単色ラインセンサによって、スクリーン20上に投射された映像の内側の輝度と、映像の外側の輝度(周辺輝度)とが測定されることを示す模式図である。It is a schematic diagram which shows that the brightness | luminance inside the image | video projected on the screen 20, and the brightness | luminance (periphery brightness | luminance) outside the image | video are projected by the monochrome line sensor.

符号の説明Explanation of symbols

1 A/D変換器
2 映像信号処理回路
3 フレームメモリ
10 CPU
12 単色ラインセンサ
1 A / D converter 2 Video signal processing circuit 3 Frame memory 10 CPU
12 Monochromatic line sensor

Claims (1)

投射面上の輝度を検出する輝度検出器を備え、前記投射面上に投射映像を投射する投射型映像表示装置において、
前記輝度検出器は前記投写映像の幅よりも検出幅を広くする広角レンズを前記輝度検出器と前記投射面との間にさらに備え、
前記輝度検出器は投射型映像表装置本体の前面に前向きに設けられ
前記輝度検出器は前記投射面上に投射された映像の内側の輝度と外側の輝度を検出し、
前記輝度検出器によって検出された前記投射面上に投射された映像の外側の輝度に基づいて、投射する映像の輝度を制御する制御手段を備えていることを特徴とする投射型映像表示装置
In a projection-type image display device that includes a luminance detector that detects luminance on a projection surface and projects a projection image on the projection surface.
The luminance detector further comprises a wide-angle lens that makes the detection width wider than the width of the projected image between the luminance detector and the projection surface,
The brightness detector prospectively provided on the front surface of the projection type image table apparatus main body,
The luminance detector detects an inner luminance and an outer luminance of an image projected on the projection surface ,
A projection-type image display apparatus comprising: control means for controlling the luminance of an image to be projected on the basis of the luminance outside the image projected on the projection plane detected by the luminance detector.
JP2003301808A 2003-08-26 2003-08-26 Projection-type image display device Expired - Fee Related JP4518764B2 (en)

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JP5245362B2 (en) * 2007-11-07 2013-07-24 株式会社ニコン Camera with projector
CN105185301B (en) * 2015-08-12 2017-11-17 西安诺瓦电子科技有限公司 Brightness of display screen adjusting method

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JP4030199B2 (en) * 1998-08-21 2008-01-09 三菱電機株式会社 Projection type LCD
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JP2002311503A (en) * 2001-04-19 2002-10-23 Mitsubishi Electric Corp Image quality correction system
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