Pulse width modulation signal generation circuit, data line...

Details Pulse width modulation signal generation circuit, data line... Pulse width modulation signal generation circuit, data line...

2005-08-09

2005-08-09

Wu, Xiao (Department: 2674)

Computer graphics processing and selective visual display system

Display driving control circuitry

Intensity or color driving control

C345S089000, C345S098000, C345S100000, C345S211000

Reexamination Certificate

active

06927785

ABSTRACT:
The present invention provides a pulse width modulation signal generation circuit that generates pulse width modulation signals that can suppress the increase in power consumption caused by the increase in grayscale, together with a data line drive circuit, electro-optical device, and electronic instrument that use the same. The pulse width modulation signal generation circuit generates a pulse width modulation signal based on (a+b) bits of grayscale data that have been read from RAM. During that time, the circuit detects a match between a first count value and the high-order the a-bit grayscale data and a match between a second count value, which is one less than that first count value, and the high-order the a-bit grayscale data. In a decoder circuit, one of the match detection results is used to output a pulse width modulation signal, in correspondence with a result of decoding a frame number and the low-order b-bit the grayscale data.

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