Color liquid-crystal shutter array having unique pixel arrangeme

Details Color liquid-crystal shutter array having unique pixel arrangeme Color liquid-crystal shutter array having unique pixel arrangeme

1993-12-13

1996-08-20

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 61, 359 55, 345 94, 345208, G02F 11335, G02F 11343, G09G 336

Patent

active

055484239

ABSTRACT:
A method of driving positive-type super-twisted nematic liquid crystal shutters by using a low-voltage CMOS-LSI maintaining a contrast ratio of greater than 100 without being colored. When an inter-electrode voltage at which the color of the liquid crystal pixels constituting the liquid crystal shutters starts to extinguish is denoted by VL and an inter-electrode voltage that minimizes the transmission factor of the liquid crystal pixels is denoted by VM, a peak value of the AC voltage applied to the opposing electrode is set to be (VL+VM)/2, and a peak value of the AC voltage applied to the signal electrodes is set to be (VL-VM)/2. The AC voltage applied to the opposing electrode and the AC voltage applied to the signal electrodes are set to be in phase with each other to select a bright level and are inverted relative to each other in phase to select a dark level.

REFERENCES:
patent: 4231640 (1980-11-01), Funada
patent: 4335936 (1982-06-01), Nonomura
patent: 4818981 (1989-04-01), Oki
patent: 4844569 (1989-07-01), Wada
patent: 4920409 (1990-04-01), Yamagishi
patent: 5047789 (1991-09-01), Kanayama
patent: 5206673 (1993-04-01), Kawahara
Japanese Unexamined Utility Model Application (KOKAI) No. 61-125453 Aug. 7, 1986 Myoshi.
Japanese Unexamined Patent Application (KOKAI) No. 62-134624 Jun. 17, 1987 Konishi.
Japanese Uexamined Patent Application (KOKAI) No. 62-150330 Jul. 4, 1987 Shioji.

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