Method for displaying images comprising Q levels of grey on a ma

Details Method for displaying images comprising Q levels of grey on a ma Method for displaying images comprising Q levels of grey on a ma

1992-01-06

1994-06-14

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345147, G09G 300

Patent

active

053214188

ABSTRACT:
A method for displaying, on a matrix screen composed of pixels disposed along K lines and M columns, images having Q grey levels G.sub.j, 0.ltoreq.j.ltoreq.Q-1. Pixels are scanned and to display a given grey level, a mixed number of black and white states of the pixels are displayed. The number of white states and the number of black states required to display a given grey level are calculated based on a number of sub-frames N used to display the grey scale image and the number of different grey scales Q. This assigns a black state or a white state to each of the addressing phase indices. The addressing phase indices are then selected according to predetermined rules and the states of the pixels in each sub-frame vary within a sub-frame displaying a given grey scale by keeping the number of black and white pixels of the sub-frame as constant as possible.

REFERENCES:
patent: 5122783 (1992-06-01), Bassetti, Jr.
patent: 5157524 (1992-10-01), Dijon et al.
patent: 5252959 (1993-10-01), Kono
1985 International Display Research Conference, S. T. Lagerwall et al., pp. 213-221, "Ferroelectric Liquid Crystals for Displays".

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