Pulse width modulation signal generating device, image display apparatus including pulse width modulation signal generating device, and pulse width modulation signal generating method
First Claim
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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Abstract
A pulse width modulation signal generating device which generates a pulse width modulation signal for modulating laser beam according to image data includes: a cycle signal output circuit which outputs 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 which receives supply of the image data and the cycle signal and modulates 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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Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A pulse width modulation signal generating method which generates a pulse width modulation signal for modulating laser beam according to image data, comprising:
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outputting 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 receiving the image data and the cycle signal and modulating 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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Specification