Primary-side driving control circuit for backlight of LCD panel

Details Primary-side driving control circuit for backlight of LCD panel Primary-side driving control circuit for backlight of LCD panel

2011-08-16

2011-08-16

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S219000, C315S308000, C315S177000

Reexamination Certificate

active

07999493

ABSTRACT:
The present invention discloses a primary-side driving backlight circuit for LCD panel. The primary-side driving backlight circuit employs a single isolation device to achieve isolation request for safety for the secondary side. The PWM controller on the secondary-side of a transformer generates a control signal according to a feedback signal. The control signal is transmitted by the isolation device to a High/Low side driver. The High/Low side driver has a High Output and a Low Output, which drives power switches at high side and low side respectively, in order to control the power of an input source transmitting into the transformer and further control the voltage and current of cold cathode lamp(s) of a backlight circuit.

REFERENCES:
patent: 4322817 (1982-03-01), Kuster
patent: 5977725 (1999-11-01), Miyazaki et al.
patent: 2006/0284568 (2006-12-01), Chang et al.

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