Method of adjusting a pulse-width modulation clock

Details Method of adjusting a pulse-width modulation clock Method of adjusting a pulse-width modulation clock

2011-07-26

2011-07-26

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

Reexamination Certificate

active

07986294

ABSTRACT:
A method for driving a planar light source device is provided. The planar light source device includes (a) a plurality of planar light source units to light a color LCD device from the back, each planar light source unit including a red LED, a green LED, and a blue LED; and (b) a driving circuit to perform ON/OFF control of the red LED, the green LED, and the blue LED included in each planar light source unit on the basis of pulse-width modulation. The method includes adjusting respective pulse-width modulation unit clocks CLR-unit, CLG-Unit, and CLB-Unitin each planar light source unit to long or short by increasing or decreasing the number of frequency division cycles of a system clock in the driving circuit.

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