发明名称 |
Liquid crystal structure with improved black state, and projector using same |
摘要 |
A liquid crystal (LC) lightvalve comprising a twisted nematic LC layer whose molecules are aligned with pixel edges at the mirror backplane, thereby providing improved contrast and efficiency, and reduced visibility of post spacers in black state. The present invention is directed to an LC structure wherein the backplane is rubbed in a direction rectilinear with pixel edges. The LC layer is given the same twist rotation and birefringence as in the conventional TN lightvalve. Polarization control is maintained by illuminating the lightvalve with light whose polarization is rotated by the twist angle relative to the x,y, pixel axes, and by collecting the orthogonally polarized component of the reflected light. The lightvalve top glass is thus rubbed in a direction which is rotated by the twist angle from the horizontal or vertical direction at which the backplane is rubbed.
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申请公布号 |
US2005001958(A1) |
申请公布日期 |
2005.01.06 |
申请号 |
US20040897456 |
申请日期 |
2004.07.23 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
HO KENNETH C.;LU MINHUA;ROSENBLUTH ALAN E.;YANG KEI-HSIUNG |
分类号 |
G09G3/36;G02B27/28;G02F1/13;G02F1/1335;G02F1/1343;G02F1/139;G03B21/28;G09G3/20;H04N9/31;(IPC1-7):G02F1/133 |
主分类号 |
G09G3/36 |
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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