发明名称 |
Polarizing illumination device and projection display device |
摘要 |
A polarizing illumination device and a projection display device using the polarizing illumination device improve light utilization efficiency. Polarizing conversion elements are placed so that one of polarizing separation films of a first polarizing conversion element and one of polarizing separation films of a second polarizing conversion element are close to each other and so that effective incident areas and ineffective incident areas are alternately arranged in the x direction. The width WP in the x direction of the effective incident areas and the ineffective incident areas is set to be larger than half of the width WL in the x direction of small lenses in a second lens array. The optical axes of each of small lenses are offset from the lens centers thereof so that partial beams emerging from the small lenses in a first lens array optimally enter the effective incident areas where the partial beams should enter.
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申请公布号 |
US6092901(A) |
申请公布日期 |
2000.07.25 |
申请号 |
US19980203343 |
申请日期 |
1998.12.02 |
申请人 |
SEIKO EPSON CORPORATION |
发明人 |
HASHIZUME, TOSHIAKI;USHIYAMA, TOMIYOSHI;IECHIKA, HISASHI |
分类号 |
G02F1/13;G02B27/28;G02F1/1335;G02F1/13357;G03B21/00;H04N9/31;(IPC1-7):F21V9/14;G02B5/30 |
主分类号 |
G02F1/13 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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