发明名称 |
Directional display and method of making a mask for a directional display |
摘要 |
A directional display comprises a display arrangement such as a spatial light modulator 2 and a rear parallax barrier 6 illuminated by a suitable backlight 1. The spatial light modulator 2 and the parallax barrier 6 cooperate to produce Fresnel diffraction which results in spatially non-uniform brightness across viewing windows of the display. Also, where the spatial light modulator 2 has pixels of non-constant vertical aperture, further variations in the intensity profile at the windows occurs. In order to compensate for this, a mask 21 is provided, for instance between the parallax barrier 6 and the backlight 1. The mask 21 cooperates with the parallax barrier 6 to produce an intensity pattern having variations which are the inverse of the variations in intensity pattern produced by the parallax barrier 6 and the spatial light modulator 2. The variations are superimposed and substantially cancel each other out so as to result in viewing windows which have substantially uniform light intensities. <IMAGE> <IMAGE> |
申请公布号 |
EP0847208(A3) |
申请公布日期 |
1999.10.27 |
申请号 |
EP19970309840 |
申请日期 |
1997.12.05 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
MOSELEY, RICHARD ROBERT;WOODGATE, GRAHAM JOHN;EZRA, DAVID |
分类号 |
G02B5/32;G02B27/22;G02F1/13357;G09F9/00;H04N13/00;H04N13/04 |
主分类号 |
G02B5/32 |
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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