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    • 6. 发明授权
    • Switchable color filter
    • 可切换滤色片
    • US07126654B2
    • 2006-10-24
    • US10415713
    • 2001-11-01
    • Jürg FünfschillingKlaus SchmittMartin Schadt
    • Jürg FünfschillingKlaus SchmittMartin Schadt
    • G02F1/1347
    • H04N9/3117G02B5/3016G02F1/133533G02F1/133536G02F1/13473G02F1/23G02F2001/133543G02F2001/133638G02F2201/343G02F2203/34
    • A liquid crystal switchable color filter switches between three color bands and is preferably used for time-sequential devices, such as projection devices, direct view displays and video cameras. The color filter may employ circularly polarizing selective reflection bands of at least four cholesteric filters together with three liquid crystal switches and related retarder layers. In one embodiment, the handedness of the second cholesteric is equal to the handedness of the third cholesteric filter and opposite to the handedness of the first and fourth cholesteric filter and, for the blocking state of a color band, the optic axis of the corresponding liquid crystal switch is parallel or perpendicular to the polarization direction. This concept leads to improved, excellent color saturation and requires less stringent production tolerances than in the prior art. Moreover, it advantageously allows overlapping color transmission bands thus improving the light efficiency.
    • 液晶可切换彩色滤光片在三个色带之间切换,优选用于诸如投影设备,直视图和摄像机的时序设备。 滤色器可以采用至少四个胆甾型滤光器的圆偏振选择反射带,以及三个液晶开关和相关的延迟器层。 在一个实施例中,第二胆甾醇的螺旋性等于第三胆甾型滤光器的螺旋性,并且与第一和第四胆甾型滤光器的螺旋性相反,并且对于色带的阻挡状态,相应液体的光轴 晶体开关平行或垂直于偏振方向。 该概念导致改进的优异的色饱和度,并且比现有技术要求的生产公差要小得多。 此外,其有利地允许重叠的彩色传输频带,从而提高光效率。