Patent ID: 7593151

Claim:
A display unit having a coherent light scanning system for scanning coherent light, and projecting the coherent light onto a screen, said coherent light scanning system comprising: a coherent light generator for receiving a coherent light generation signal and for outputting coherent light; a polygon mirror for receiving the coherent light from the coherent light generator and for reflecting the coherent light to be projected on the screen; and an optical path formation part for receiving the coherent light from the polygon mirror and transmitting the coherent light onto the screen, such that each reflection plane of the polygon mirror corresponds to multiple scans of coherent light on the screen and at least one change in a scanning direction of the coherent light on the screen during each rotation of the polygon mirror, wherein the scanning direction of coherent light on the screen changes corresponding to an angle of the polygon mirror relative to the coherent light received at the polygon mirror, and the coherent light generator signal corresponds to a string of data, the string of data being read in a first direction corresponding to a first scan direction of coherent light on the screen, and being read in a reverse direction corresponding to a second scan direction of coherent light on the screen.