Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-04-12
1999-09-07
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, 345 96, 345 99, 37 64, 37 75, G09G 336
Patent
active
059493984
ABSTRACT:
When a given row in an array of a liquid crystal display having a toggling backplane voltage is de-selected, the row select line voltage also toggles to prevent capacitive current in the pixel capacitance. The row select line driver includes a pair of transistors coupled in a push-pull configuration. The pair of transistors are responsive to a control signal that is produced in a corresponding stage of cascaded stages of a shift register. The pair of transistors form a buffer stage that prevents the toggling voltage developed in the row select line when the row is de-selected from affecting the operation of the shift register.
REFERENCES:
patent: 5055709 (1991-10-01), Smith
patent: 5055720 (1991-10-01), Tiede
patent: 5170155 (1992-12-01), Plus et al.
patent: 5222082 (1993-06-01), Plus
patent: 5410583 (1995-04-01), Weisbrod et al.
patent: 5434899 (1995-07-01), Huq et al.
patent: 5701136 (1997-12-01), Huq et al.
14.5: Capacitively Coupled Driving of TFT-LCD by Nagata, et al., pp. 242-245, SID 89 Digest.
A Compensative Driving Method For Common Electrode Voltage Distortion in TFT-LCDS by Tomita, et al., pp. 235-238.
Driver Circuits for AMLCDs by Lewis, et al., pp. 56-64.
(RCA 87842) Ser. No. 08/399,014, filed Mar. 6, 1995 by Huq, et al., entitled A Liquid Crystal Display Driver With Threshold Voltage Drift Compensation.
Chang Kent
Henig Sammy S.
Hjerpe Richard A.
Laks Joseph J.
Thomson Multimedia S.A.
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