Patent ID: 7513624
Filing Date: 2009-04-07
Classification: G09G,H04N

Abstract:
1. An arrangement for projecting an image on a viewing screen, comprising: a laser source including a laser for generating a laser beam having an output power, a main current source for supplying a main bias current to the laser, and another current source for supplying another bias current to the laser; a feedback circuit including a photodiode for detecting the output power, and for generating and feeding a feedback signal to the main current source to control the main bias current; a scanner for sweeping the laser beam to form a scan line having pixels arranged along one direction, and for sweeping the scan line along another direction orthogonal to the one direction to form a raster pattern of scan lines on the viewing screen; and a controller including a modulator for converting input image data into output control signals and for controlling the other current source to modulate the other bias current, both bias currents being combined for modulating the laser beam to illuminate selected pixels on the scan lines to form the image on the viewing screen.