Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1992-06-01
1995-05-02
Weldon, Ulysses
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345149, G09G 336
Patent
active
054123950
ABSTRACT:
A frame thinning out system has been used as a display driving method for making a gradational display with several brightness levels on the screen of a liquid crystal display device and the like. This display driving method creates a gradational display by setting a plurality of frame time periods, during which each of a plurality of pixels on the screen of the display device is controlled for displaying an image, as one integration time period. The pixels are turned on for only a number of specified frame time periods corresponding to a brightness level to be displayed. All pixels of the display device are grouped into multiple groups composed of a plurality of pixels contiguous to each other. The number of pixels to be turned on in each frame time period is selected corresponding to the specified gradation data within the same group. Thus, the number of pixels to be turned on for one frame time period may be equal between subgroups in the scanning lines within the same group. The frame time period during which the number of pixels turned on is kept constant is set such that a human being does not sense flicker. Thus, a gradational display without noticeable flicker can be obtained. Since no delicate shades of brightness occur among pixels to the same gradation level, quality of the display is improved.
REFERENCES:
patent: 3821721 (1974-06-01), Hughes
patent: 3997719 (1976-12-01), Judice
patent: 4531160 (1985-07-01), Bhu
patent: 4827255 (1989-05-01), Ishii
patent: 5266940 (1993-11-01), Shiraishi
Maeda Hiroshi
Omori Takuro
Liang Regina
Sharp Kabushiki Kaisha
Weldon Ulysses
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