Driving circuit

Details Driving circuit Driving circuit

2006-09-05

2006-09-05

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Intensity or color driving control

C345S010000, C345S011000, C345S213000

Reexamination Certificate

active

07102654

ABSTRACT:
A driving circuit of this invention has a comparator that compares an input signal with a sampling signal to perform a pulse width modulation to the input signal, a driving transistor circuit that switches according to an output signal of the comparator, and a filter that reduces a switching frequency component of the driving transistor circuit. The switching frequency of the driving transistor circuit is a product of multiplication of a horizontal frequency. Also, a PLL circuit that locks the frequency of the sampling signal to the frequency acquired from multiplication of the horizontal frequency is provided. Therefore, when the driving circuit with the PWM method is built in a television set, beat interference can be prevented, avoiding an unpleasant view caused by the raster interference on the television screen.

REFERENCES:
patent: 4503456 (1985-03-01), Nakamura et al.
patent: 5329367 (1994-07-01), Fernsler et al.
patent: 5519445 (1996-05-01), Ohira
patent: 5929574 (1999-07-01), Kim et al.
patent: 6404135 (2002-06-01), Shino
patent: 6549198 (2003-04-01), Uto et al.
patent: 6795043 (2004-09-01), Shibata

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