发明授权
- 专利标题: Rear-projection screen and a rear projection image display employing the rear-projection screen
- 专利标题(中): 后投影屏幕和采用后投影屏幕的背投影像显示器
-
申请号: US336528申请日: 1994-11-09
-
公开(公告)号: US5513037A公开(公告)日: 1996-04-30
- 发明人: Takahiko Yoshida , Koji Hirata , Hiroki Yoshikawa , Masayuki Muranaka , Isao Yoshizaki , Atsuo Osawa
- 申请人: Takahiko Yoshida , Koji Hirata , Hiroki Yoshikawa , Masayuki Muranaka , Isao Yoshizaki , Atsuo Osawa
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX3-252831 19910905; JPX3-307230 19911028; JPX3-355569 19911224; JPX4-140388 19920601
- 主分类号: G03B21/62
- IPC分类号: G03B21/62 ; G03B21/60
摘要:
A rear-projection screen for a rear-projection image display comprises a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface (41) of the light absorbing sheet (4) is formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. The thickness of the Fresnel lens sheet (2) is approximately equal to that of the lenticular lens sheet (3). The entrance surface (31) and the exit surface (32) of the lenticular lens sheet (3) are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material, which is essential to the prior art rear-projection screen, are not necessarily dispersed in the base sheet (30) of the lenticular lens sheet (3). The rear-projection image display provided with this rear-projection screen has satisfactory focusing characteristics and enhanced vertical directional characteristics and is capable of displaying an image in high brightness and high contrast.
公开/授权文献
- US5117152A Cathode ray tube including a magnetic focusing lens 公开/授权日:1992-05-26
信息查询