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TWO-STATE ELECTRO-OPTICAL OBTURATING DEVICE WITH A TRANSMITTANCE THAT IS OPTIMISED OVER THE ENTIRE VISIBLE SPECTRAL BAND
TWO-STATE ELECTRO-OPTICAL OBTURATING DEVICE WITH A TRANSMITTANCE THAT IS OPTIMISED OVER THE ENTIRE VISIBLE SPECTRAL BAND
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机译：在整个可见光谱带上都优化了透射率的两种状态的光电光器件
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摘要
An electro-optical obturating device comprising a pair of superposed optical cells is proposed. A first cell (10) comprises a first material comprising a host cholesteric liquid crystal, a guest chiral dopant of 1 and 2% by weight of the first material so that the first material has a helical pitch comprised in the range 450 nm to 460 nm, and a guest neutral dichroic dye. A second cell (20) comprises a second material comprising a second host cholesteric liquid crystal, a second guest neutral dichroic dye, and a guest nematic liquid crystal having a concentration comprised between 14 and 20% by weight of the second material so that the second material has a helical pitch comprised in the range 550 nm to 580 nm.
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