Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-05-01
1998-04-28
Bayerl, Raymond J.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, 345 90, 349 33, 349 41, 349 46, G09G 336, G02F 1133
Patent
active
057450870
ABSTRACT:
A gray scale signal duty ratio conversion section employs D flip-flops and AND gates so as to generate detection pulses for rises and falls of the gray scale signal T based on the gray scale signal T input from the control circuit and the clock signal CKT. Among the rise-detection pulses and fall-detection pulses, only the fall-detection pulses are delayed by the D flip-flop by one clock, and the delayed fall-detection pulses and the rise-detection pulses are input to an RS flip-flop so that the altered gray scale signal T' is obtained as an output of the RS flip-flop. The altered gray scale signal T' thus obtained is a signal whose HIGH period is longer than the input gray scale T by one clock. Thus, it is possible to compensate for the phenomenon associated with a TFT liquid crystal display device driven by the gray-scale driving method where a voltage applied to a liquid crystal capacitance may vary with the turning off of the TFT is from the voltage it was charged with. As a result, the liquid crystal material is prevented from being deteriorated, whereby the display quality and the reliability of the liquid crystal display device are improved.
REFERENCES:
patent: 4345249 (1982-08-01), Togashi
patent: 4630122 (1986-12-01), Morowaka
patent: 4805994 (1989-02-01), Miyajima
patent: 4908710 (1990-03-01), Wakai et al.
patent: 5062691 (1991-11-01), Tristani-Kendra et al.
patent: 5162786 (1992-11-01), Fukuda
patent: 5196738 (1993-03-01), Takahara et al.
patent: 5233447 (1993-08-01), Kuribayashi et al.
patent: 5253093 (1993-10-01), Takeda et al.
patent: 5541747 (1996-07-01), Nishi et al.
Kawaguchi Takafumi
Tomiyoshi Akira
Bayerl Raymond J.
Sharp Kabushiki Kaisha
Vail Seth D.
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