Illumination system and display device including such a system

Details Illumination system and display device including such a system Illumination system and display device including such a system

1996-12-17

1998-02-24

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal optical element

Passive liquid crystal polarizer

349 98, 349175, G02F 113, G02F 11335, C09K 1802

Patent

active

057216037

ABSTRACT:
An illumination system comprising a reflector, a cholesteric filter and a depolarizer. The cholesteric filter is arranged between a radiation source and, in a display device, a display panel, and is selected to transmit radiation having a selected state of polarization in a selected wavelength range, while reflecting otherwise polarized radiation in that wavelength range. The depolarizer is disposed between the reflector and the cholesteric filter. Radiation reflected by the cholesteric filter is re-reflected to the filter by the reflector and, having been depolarized in the depolarizer, is transmitted to the extent it has the selected state of polarization in the selected wavelength.

REFERENCES:
patent: 4088400 (1978-05-01), Assouline
patent: 4298249 (1981-11-01), Gloor
patent: 4737896 (1988-04-01), Mochizuki et al.
patent: 5029986 (1991-07-01), De Vaan
patent: 5159478 (1992-10-01), Akiyama
patent: 5262880 (1993-11-01), Abeleah
patent: 5325218 (1994-06-01), Willett
patent: 5341231 (1994-08-01), Yamamoto et al.
patent: 5513025 (1996-04-01), Watanabe et al.
"Polarizing Color Filters made from Cholesteric LC Silicones" by R. Maurer et al. in SID International Symposium 1990, Digest of Technical Papers, pp. 110-113 (No Month).
"New Liquid Polarized Color Projection Principle" in Japanese Journal of Applied Physics, vol. 29, No. 10, Oct. 1990, pp. 1974-1984 by M. Schadt and J. Funfschilling.
"Retardation Film for STN-LCD's `NRF`" by the firm of Nitto Denko in SID '92 Exhibit Guide, Society for Information Display, May 17-22, 1992, Boston, MA.

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