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PULSE WIDTH MODULATION SIGNAL GENERATING DEVICE, IMAGE DISPLAY APPARATUS INCLUDING PULSE WIDTH MODULATION SIGNAL GENERATING DEVICE, AND PULSE WIDTH MODULATION SIGNAL GENERATING METHOD

  • US 20090310633A1
  • Filed: 05/15/2009
  • Published: 12/17/2009
  • Est. Priority Date: 06/17/2008
  • Status: Active Grant
First Claim
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1. A pulse width modulation signal generating device which generates a pulse width modulation signal for modulating laser beam according to image data, comprising:

  • a cycle signal output circuit adopted to output a cycle signal having a cycle corresponding to a drawing rate for drawing the image data by the laser beam; and

    a pulse width modulation circuit adopted to receive the image data and the cycle signal and modulate a pulse wave having a cycle determined by the cycle signal by changing duty ratio of the pulse wave based on the image data to produce the pulse width modulation signal.

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