Patent ID: 7791561
Filing Date: 2010-09-07
Classification: G03B,G09G,H04N

Abstract:
1. A display system, comprising: a screen comprising a substrate on which a plurality of parallel fluorescent stripes are formed, wherein adjacent fluorescent stripes are made of different fluorescent materials that absorb light at an excitation wavelength to emit light of different colors, respectively; and an optical module to project and scan one or more excitation optical beams at the excitation wavelength onto the screen to convert an image carried by the one or more excitation optical beams via an optical modulation into an image produced by emitted light from the parallel fluorescent stripes on the screen, wherein the optical module comprises a modulation control which controls the optical modulation of each excitation optical beam to produce image grey scales, wherein the optical module comprises: a mechanism to monitor image data bits to be modulated on an excitation optical beam to produce a black pixel monitor signal that indicates black pixels in image data bits; at least a diode laser to produce a laser beam as the excitation optical beam; and a laser control coupled to receive the black pixel monitor signal and to operate the diode laser at a driving current below a laser threshold current without turning off the driving current to produce a low light output representing a black color on the screen when the black pixel monitor signal indicates a length of black pixels is less than a response delay time of the diode laser and turn off the driving current to produce a true black color on the screen when the black pixel monitor signal indicates a length of black pixels is greater than the response delay time of the diode laser.