Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-10-16
2011-11-08
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C315S294000
Reexamination Certificate
active
08054283
ABSTRACT:
An “LED” driving circuit comprises an “LED” driving voltage generator which generates an “LED” driving voltage, a pulse width modulation (“PWM”) control unit which outputs a “PWM” signal having a predetermined duty ratio, and a main switching unit which controls the driving voltage applied to the “LEDs” in accordance with the “PWM” signal. Further, the “PWM” control unit comprises a controller including an error amplifier which detects an error between a reference voltage and a driving voltage and amplifies the detected error, an oscillator which outputs a pulse signal having a predetermined oscillation frequency, and a comparator which compares the pulse signal output from the oscillator with an output voltage from the error amplifier to generate a “PWM” signal; and a high frequency damper connected to the main switching unit to prevent malfunction of the controller due to noise. A backlight unit and liquid crystal display incorporate the “LED” driving circuit.
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Jang Tae Seok
Lee Sang Gil
Lee Sang Hoon
Cantor & Colburn LLP
Hjerpe Richard
Samsung Electronics Co,. Ltd.
Schnirel Andrew
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