Color display device with chirped diffraction gratings

Details Color display device with chirped diffraction gratings Color display device with chirped diffraction gratings

1993-08-10

1997-03-25

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Lens or prism separate from projection system

359 19, 359575, 359571, 349 95, 349158, G02F 11335

Patent

active

056150245

ABSTRACT:
A display device comprises a liquid crystal spatial light modulator (1) associated with diffractive means, such as a diffraction grating comprising grating elements (5). The diffraction grating is illuminated by a light source (6, 7) and each element is chirped and blazed so as to separate the primary colors of the illuminating light and direct them to individual light-modulating elements (R, G, B) of the modulator (1). By dispensing with conventional color filters, the efficiency of the display device is improved. Further, the focusing action of the grating elements (5) directs light to the elements of the modulator (1) so as to prevent light wastage caused by blocking of light by opaque regions of the display.

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Yao et al "Chirp-Grating lens for guided-wave optics" Appl. Phys. Letter 33(7)-Oct. 1978 -pp. 635-637.
Search Report for European Appl. 93306299.4, mailed Nov. 18, 1993.
Brady et al, "Liquid Crystal Color Display", IBM Tech. Bul., vol. 24, No. 3, Aug. 1981, pp. 1573-1576.

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