Local dimming on light-emitting screens for improved image uniformity in scanning beam display systems

摘要

Systems and techniques for scanning-beam display are provided to use local dimming on the optical energy of at least one optical beam to minimize the non-uniform image brightness across the screen. This local dimming during the beam scanning can be achieved by adjusting optical energy of at least one optical beam during the scanning based on (1) the location of the scanning optical beam and (2) the predetermined distortion information at the location.

主权项

1. A method for controlling image displaying in a scanning beam display system, comprising:
scanning one or more optical beams of optical pulses onto a screen to display images carried by the optical pulses on the screen; during the scanning, adjusting optical energies of the optical pulses of the one or more optical beams in form of a time domain signal modulation to carry image information with respect to positions of the one or more scanning optical beams on the screen to render the images on the screen by using the scanning to transform the time domain signal modulation in each optical beam into spatial images on the screen; and during the scanning, in addition to the adjusting optical energies of the optical pulses for transforming the time domain signal modulation in each optical beam into the spatial images on the screen, further adjusting optical energies of the optical pulses of at least one optical beam, based on a predetermined spatial variation of the optical beam in connection with a location of the optical beam on the screen caused by one or more distortions in scanning the optical beam onto the screen, to reduce the one or more distortions in the images displayed on the screen.