Liquid crystal display device including a birefringent filter an

Details Liquid crystal display device including a birefringent filter an Liquid crystal display device including a birefringent filter an

1997-05-28

2000-06-13

Parkes, Kenneth

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

348833, 359594, 359497, G02F 11335

Patent

active

060755814

ABSTRACT:
An image display apparatus and a liquid-crystal display device using such an optical filter for diffusing pixels while suppressing the occurrence of moire. A diffuser (optical filter) 13 comprising a combination of a diffraction grating 26 and a birefringence plate 27 is disposed on an LCD 11 in an opposing relation to the viewer side. The diffraction grating 26 diffuses each pixel of the LCD 11 into three points in the vertical direction by a shift amount of POy/3 (POy: same color pixel pitch in the vertical direction). Further, the birefringence plate 27 diffuses each diffused pixel into two points in the horizontal direction by a shift amount of Pox/2 (Pox: same color pixel pitch in the horizontal direction). Thus, the diffuser 13 diffuses each pixel of the LCD 11 into six pixels to thereby optically erase a matrix-like pixel pattern. The diffraction grating 26 diffuses pixels by a large shift amount, whereby a total thickness of birefringence plate can be suppressed from increasing as compared with an optical filter for diffusing pixels by use of only a birefringence plate. Since the diffraction grating 26 diffuses pixels by a large shift amount, a grating pitch can be reduced, and the occurrence of moire can be suppressed.

REFERENCES:
patent: 4100570 (1978-07-01), Nobutoki
patent: 5048949 (1991-09-01), Sato et al.
patent: 5471343 (1995-11-01), Takasugi
patent: 5737042 (1998-04-01), Shinohara et al.

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