Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2006-08-08
2008-03-25
Owens, Douglas W. (Department: 2821)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C315S307000, C315S291000, C315S158000
Reexamination Certificate
active
07348960
ABSTRACT:
A backlight device includes a light source module having a plurality of light sources, a detecting circuit, a control unit, and a pulse width modulation (PWM) driving circuit. The detecting circuit is used for detecting the brightness of the light source module and generating a detecting signal to the control unit, such that the control unit outputs a control signal according to the detecting signal. In addition, the PWM driving circuit is used for generating a PWM signal for driving the light source module. In the present invention, the PWM driving circuit adjusts the base frequency of the PWM signal according to the control signal without adjusting the duty cycle of the PWM signal, so as to control the brightness of the light sources.
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Huang Li-Ren
Lin Chung-Wei
Yeh Chin-Ching
Alemu Ephrem
Industrial Technology Research Institute
Jianq Chyun IP Office
Owens Douglas W.
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