Power calibration of multiple light sources in a display screen

摘要

A display device with multiple light sources includes a detector that dynamically measures output intensities of the light sources as the light sources are producing light to cause an image to be formed on a display screen. A controller for the display device compares the measured output intensities with desired output intensities determined from factory-calibrated correlation values and adjusts the inputs to the light sources to compensate for drift and other similar effects, so that brightness uniformity among the multiple light sources can be achieved.

主权项

1. A light-based display device, comprising:
a display screen; pixels disposed in the display screen; light sources for producing a first light that is conveyed to the pixels, wherein the pixels emit a second light distinct from the first light; a detector positioned on a light source side of the pixels, wherein the detector measures output intensity of the first light produced by one or more of the light sources as correlated to an input current to the one or more of the light sources, wherein the first light measured by the detector is a portion of the first light not impinging on the pixels; and a controller for modulating the input current to a first light source in accordance with desired output intensities as determined from the correlation of the measured output intensity of the first light produced by a second light source to the input current to the first light source; wherein the detector measures at least a portional output intensity of the light produced by the light sources, wherein the light sources are laser beam sources for producing laser beams, the system further comprising a beam splitter disposed in optical paths of the laser beams and directing a portion of the laser beams to the detector.