Liquid crystal driving semiconductor chip

Details Liquid crystal driving semiconductor chip Liquid crystal driving semiconductor chip

2007-01-30

2007-01-30

Lao, Lun-Yi (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S098000, C345S204000

Reexamination Certificate

active

10807135

ABSTRACT:
Disclosed is a liquid crystal driving semiconductor chip capable of preventing an electrostatic-surge originated malfunction. A monitor electrode for monitoring the ground potential of an external power supply circuit is provided as separate from a ground electrode16for power supply, the logical level of the monitor electrode is detected by an NMOS transistor in a level monitor section and a NAND gate is controlled by the detected signal. When the ground potential in the semiconductor chip drops due to, for example, a negative electrostatic surge, the logical level of the monitor electrode increases relatively to turn the NMOS transistor on, thereby setting the detected signal to “L”. As a result, the NAND gate is closed so that an enable signal from a control electrode stops being supplied to a control section, thereby preventing a malfunction originating from the erroneous enable signal.

REFERENCES:
patent: 5532718 (1996-07-01), Ishimaru
patent: 6633274 (2003-10-01), Yokota et al.
patent: 08-22267 (1996-01-01), None
patent: 08-22268 (1996-01-01), None

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