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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 8,058,633 B2
  • Filed: 05/15/2009
  • Issued: 11/15/2011
  • Est. Priority Date: 06/17/2008
  • Status: Expired due to Fees
First Claim
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1. A pulse width modulation signal generating device which generates a pulse width modulation signal for modulating a laser beam according to image data, comprising:

  • a cycle signal output circuit adopted to output a cycle signal having a cycle corresponding to a predetermined drawing rate for drawing an image by the laser beam in accordance with the image data; 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, wherein the predetermined drawing rate increases as the drawing position rises in a vertical direction of the image drawn by the laser beam.

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