发明名称 |
Image projector with optimized luminous efficiency |
摘要 |
Disclosed is an image projector wherein the illumination of an LCD matrix screen is done by means of two polarized beams coming from a same light beam that has no particular direction of polarization. The two polarized beams are obtained by a polarization separator whence these two polarized beams emerge with a square section. On the one hand, each polarized beam goes through at least two juxtaposed convergent lenses by which it is converted into two sub-beams which project their illumination spot on the matrix screen and, on the other hand, each convergent lens has a surface with a shape that is homothetic with the shape of the matrix screen. The luminous efficiency is thus improved through the matching of the shape of the section of the non-polarized light beam with that of the matrix screen.
|
申请公布号 |
US5272496(A) |
申请公布日期 |
1993.12.21 |
申请号 |
US19920922499 |
申请日期 |
1992.07.31 |
申请人 |
THOMSON-CSF |
发明人 |
NICOLAS, CHRISTOPHE;LOISEAUX, BRIGITTE;HUIGNARD, JEAN-PIERRE |
分类号 |
G02B27/28;G02B27/10;G02F1/13;G02F1/1335;G02F1/13357;G03B33/12;H04N5/74;H04N9/31;(IPC1-7):G03B21/14 |
主分类号 |
G02B27/28 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|