发明授权
- 专利标题： Projection apparatus and projection-type image display apparatus
- 专利标题（中）： 投影装置和投影型图像显示装置
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申请号： US10887028申请日： 2004-07-07
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公开(公告)号： US06905213B2公开(公告)日： 2005-06-14
- 发明人: Koji Hirata , Masahiko Yatsu , Futoshi Yamasaki
- 申请人： Koji Hirata , Masahiko Yatsu , Futoshi Yamasaki
- 申请人地址： JP Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Townsend and Townsend and Crew LLP
- 优先权： JP2002-040913 20020219
- 主分类号： G03B33/12
- IPC分类号： G03B33/12 ; G02B27/14 ; G02B27/28 ; G03B21/00 ; H04N9/31 ; G03B21/14 ; G03B21/20 ; G03B21/22 ; H04N3/22
摘要：
In an illumination optical system and a color combining optical system of a projection apparatus using three image display elements, the object of the present invention is to reduce misconvergence of enlarged images displayed on a screen. The present invention provides a projection apparatus including light-detecting elements provided outside of an effective screen display area. An active region of image display elements for each color beam is controlled respectively based on results of the light-detecting elements in order to adjust display position of each color beam on the screen.
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