High contrast black-and-white chiral nematic displays
First Claim
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1. A full spectrum black-and-white reflective chiral nematic display, comprising:
- (i) a chiral nematic display of controllable planar structure and focal conic structure;
(ii) two transparent substrates said substrates having conductive electrodes;
(iii) two elliptical polarizers;
(iv) said chiral nematic liquid crystal material being between the two transparent substrates;
(v) said liquid crystal material and said transparent substrates being between said polarizers; and
(vi) the display further comprising an optical reflector.
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Abstract
The invention relates to a chiral nematic display configuration, typically in liquid crystal displays, comprising a chiral nematic display of controllable planar structure and focal conic structure, characterised by the chiral nematic liquid crystal material being between two transparent substrates having conductive electrodes, the material being between two elliptical polarizers and there being an optical reflector. The invention achieves a high contrast black-and-white display. The displays in the embodiment are first and second optical mode configurations of the black-and-white chiral nematic displays.
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Citations
18 Claims
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1. A full spectrum black-and-white reflective chiral nematic display, comprising:
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(i) a chiral nematic display of controllable planar structure and focal conic structure;
(ii) two transparent substrates said substrates having conductive electrodes;
(iii) two elliptical polarizers;
(iv) said chiral nematic liquid crystal material being between the two transparent substrates;
(v) said liquid crystal material and said transparent substrates being between said polarizers; and
(vi) the display further comprising an optical reflector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A full spectrum black-and-white reflective chiral nematic display, comprising:
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(i) a chiral nematic display of controllable planar structure and focal conic structure;
(ii) two transparent substrates said substrates having conductive electrodes;
(iii) two elliptical polarizers;
(iv) said chiral nematic liquid crystal material being between the two transparent substrates;
(v) said liquid crystal material and said transparent substrates being between said polarizers;
(vi) the display further comprising an optical reflector; and
(vii) both optical polarisers being arranged to exhibit a handedness opposite to the handedness of the chiral nematic liquid crystal material.
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Specification