Device for displaying colors produced by controllable cholesteric color filters
First Claim
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1. An electrically controllable color display device having compact linear light guidance, which comprises three switchable color filters optically connected in series, each color filter comprising two cholesteric filters, two λ
- /4 plates, and one electrically switchable liquid crystal cell with segmented electrodes, each color filter being constructed so as to attenuate one of three different colors in response to electrical control.
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Abstract
Colors are generated in the display device by guiding light through three serially-arranged, electrically controlled color filters. Each filer attenuates one of three colors. The color filters incorporate two cholesteric filters, two λ/4 plates, and one electrically switchable liquid crystal display.
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Citations
12 Claims
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1. An electrically controllable color display device having compact linear light guidance, which comprises three switchable color filters optically connected in series, each color filter comprising two cholesteric filters, two λ
- /4 plates, and one electrically switchable liquid crystal cell with segmented electrodes, each color filter being constructed so as to attenuate one of three different colors in response to electrical control.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrically controllable color display which comprises three switchable color filters optically connected in series, each filter comprising in order a first cholesteric filter, a first λ
- /4 plate, a liquid crystal cell, a second λ
/4 plate, and a second cholesteric filter, each color filter being constructed so as to attenuate one of the three different colors in response to electrical control. - View Dependent Claims (11, 12)
- /4 plate, a liquid crystal cell, a second λ
Specification