Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1996-01-02
1999-05-11
Brier, Jeffery
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
364141, G09G5/00
Patent
active
059032600
ABSTRACT:
Signal management control units 47.sub.1 -47.sub.n of respective scan drivers LSI in an LCD module are cascade-connected and each have the same construction. A detected signal of the signal management control unit 47J is a data signal latch clock LP applied to a terminal CKB.sub.1. A detected signal of the signal management control unit 47.sub.2 is a frame start signal SP applied to a terminal CKB.sub.2. A detected signal of the signal management control unit 47n is an AC-transforming clock FR applied to a terminal CKBn. The signal management control unit 47.sub.1 includes a signal stop detection circuit 48 serving as a signal detection means for detecting a stop of the detected signal and a sequence processing circuit 51 consisting of a signal delay circuit 49 and a logic circuit 50. When stopping oscillations of, e. g., the frame start signal SP, outputs T.sub.1 -T.sub.n of the circuit 51 change to an L level. Hence, a display-off signal DF of the LCD module assumes the L level. A liquid crystal panel is forcibly set in a display-off mode. As a result, even if the frame start signal SP is stopped due to some cause, a liquid crystal application voltage is set down to zero. It is, therefore, possible to avoid a liquid crystal DC drive and prevent a deterioration of the liquid crystal.
REFERENCES:
patent: 3947811 (1976-03-01), Hodgson
patent: 4268827 (1981-05-01), Hughen et al.
patent: 4314245 (1982-02-01), Wilbur, Jr.
patent: 4453208 (1984-06-01), Middleton et al.
patent: 4541066 (1985-09-01), Lewandowski
patent: 4674031 (1987-06-01), Siska, Jr.
patent: 4687956 (1987-08-01), Itoh et al.
patent: 4748444 (1988-05-01), Arai
patent: 4758896 (1988-07-01), Ito
patent: 4855892 (1989-08-01), Lower
patent: 4922448 (1990-05-01), Kunieda et al.
patent: 4931791 (1990-06-01), Mallard, Jr.
patent: 5077553 (1991-12-01), Buzak
patent: 5155477 (1992-10-01), Shirochi
patent: 5155613 (1992-10-01), Sakayori
patent: 5592191 (1997-01-01), Tsuboyama et al.
patent: 5629715 (1997-05-01), Zenda
patent: 5710929 (1998-01-01), Fung
Bell Paul A.
Brier Jeffery
Janofsky Eric B.
Seiko Epson Corporation
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