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Backlight driving apparatus for LCD

  • US 20040145560A1
  • Filed: 12/19/2003
  • Published: 07/29/2004
  • Est. Priority Date: 01/24/2003
  • Status: Abandoned Application
First Claim
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1. A backlight driving apparatus for a liquid crystal device having a liquid crystal panel displaying an output picture signal and a backlight projecting rays on the liquid crystal panel, comprising:

  • an NTSC/PAL detector, which detects a vertical frequency of an input picture signal; and

    an inverter, which receives a predetermined constant voltage and generates a PWM signal to drive the backlight, wherein the inverter controls a frequency of the PWM signal based on a decision result of the NTSC/PAL detector.

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