Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-02-27
1998-05-12
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, 345 94, 345209, G09G 336
Patent
active
057512671
ABSTRACT:
A liquid crystal device has a video interface having a reference value shifter and a level converter, which work as a gamma controller, and has a counter electrode signal generating circuit having a feedback amplifying circuit for adjusting peak-to-peak amplitude of a counter electrode signal on the basis of a control signal sent from a brightness adjuster. The reference value shifter shifts a reference value of polygonal-line approximation characteristics as much as a variation of the counter electrode signal amplitude on the basis of the control signal sent from the brightness adjuster. The level converter converts a level of an image signal in accordance with the polygonal-line approximation characteristics determined on the basis of the varying reference value, and thus compensates non-linearity of light transmittance index characteristics of liquid crystal to an applied voltage. Consequently, it is possible to provide the small, thin and cheap liquid crystal display device having a display brightness adjusting function capable of producing correct gradation.
REFERENCES:
patent: 5280279 (1994-01-01), Nakazawa et al.
patent: 5298892 (1994-03-01), Shapiro et al.
patent: 5436747 (1995-07-01), Suzuki
patent: 5483256 (1996-01-01), Ohi
Sato Yuji
Tanaka Manabu
Chang Kent
Hjerpe Richard
Sharp Kabushiki Kaisha
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