发明名称 |
Contrast ratio improving method for liquid crystal projector |
摘要 |
The invention provides a method for improving the contrast ratio of the display image projected on a screen from a liquid crystal projector that comprises at least a light source, an electrode-having, twisted nematic liquid crystal cell comprising at least one nematic liquid crystal, and two polarizers disposed so that the liquid crystal cell is sandwiched between them, which is characterized in that at least two HBLC optical films are so arrayed between the polarizers that the slow axes of the films are approximately perpendicular to each other so as not to cause a retardation in the direction normal to the film surfaces; and provides a liquid crystal projector that uses the improving method. |
申请公布号 |
US2003112414(A1) |
申请公布日期 |
2003.06.19 |
申请号 |
US20020276024 |
申请日期 |
2002.11.12 |
申请人 |
YOSHIOKA KENICHIRO;TORIGOE MICHIKO;TANAKA KOUCHI |
发明人 |
YOSHIOKA KENICHIRO;TORIGOE MICHIKO;TANAKA KOUCHI |
分类号 |
G02F1/1335;G02F1/13363;H04N9/31;(IPC1-7):G03B21/00 |
主分类号 |
G02F1/1335 |
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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