Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1999-09-14
2000-11-21
Sikes, William L.
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
349 10, 349 86, 349181, G02F 11335, G02F 11333, C09K 1902
Patent
active
061510866
ABSTRACT:
An optical system and projector includes a source of light, an output system having a collection angle for receiving light and passing such received light as an output, and a liquid crystal device including relatively low birefringence liquid crystal material for selectively scattering light through a controlled angle such that a major portion of the scattered light may be collected by said output system, or for transmitting light, the output system including an aperture for transmitting such scattered light and blocking unscattered light. A method of optimizing the angle of scattering of output light in a liquid crystal device which is operable to transmit light or to scatter light to match the entrance pupil of an optical system in order to maximize the amount of collected scattered light, includes selecting the birefringence of the liquid crystal material of about 0.16 or less, and placing the liquid crystal material and medium in physical relation to cause such light scattering or transmission.
Chowdhury Tarifur R.
Lambent LLC
Sikes William L.
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