Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reissue Patent
2006-08-15
2006-08-15
Nguyen, Chanh (Department: 2675)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C700S012000
Reissue Patent
active
RE039236
ABSTRACT:
Signal management control units471-47nof 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 unit47J is a data signal latch clock LP applied to a terminal CKB1. A detected signal of the signal management control unit472is a frame start signal SP applied to a terminal CKB2. A detected signal of the signal management control unit47n is an AC-transforming clock FR applied to a terminal CKBn. The signal management control unit471includes a signal stop detection circuit48serving as a signal detection means for detecting a stop of the detected signal and a sequence processing circuit51consisting of a signal delay circuit49and a logic circuit50. When stopping oscillations of, e. g., the frame start signal SP, outputs T1-Tnof the circuit51change 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.
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Nguyen Chanh
Watson Mark P.
LandOfFree
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