Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-04-04
2010-06-15
Lewis, David L (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S213000
Reexamination Certificate
active
07737938
ABSTRACT:
In a driving circuit for an LCD backlight, a fundamental wave generator generates a triangle wave signal and a square wave signal in accordance with time constant of a time constant circuit including a time constant capacitor. A PWM comparator compares a difference signal between a feedback voltage and a preset reference voltage with the triangle wave signal to generate a PWM signal in response to the comparison result. A signal synchronizer sets a connection node between the time constant capacitor and the fundamental wave generator and an output terminal of the square wave signal in accordance with a power level of the LCD backlight. Also, a driving signal generator generates a driving signal in response to the square wave signal from the fundamental wave generator and the PWM signal from the PWM comparator. The driving circuit enables PWM controlling integrated circuits to be synchronized together.
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Gong Jung Chul
Ha Chang Woo
Min Byoung Own
Shin Sang Cheol
Lewis David L
Lowe Hauptman & Ham & Berner, LLP
Samsung Electro-Mechanics Co. Ltd.
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