Patent ID: 9736439
Date: 2017-08-15
CPC Classifications: G02B,G06F,G09G,H04N

Claim:
1. A scanning laser projector comprising: a scanning mirror to reflect a modulated light beam; a laser diode to produce the modulated light beam when driven with a drive current, the laser diode having a junction voltage when driven with the drive current; a current driver coupled to drive the laser diode with the drive current, the current driver including a power supply input and a pixel drive input; a programmable power supply coupled to provide the current driver with a programmable voltage at the power supply input; and a video processing apparatus to receive video data and to drive the current driver at the pixel drive input to illuminate pixels, wherein the video processing apparatus includes a pixel buffer to store future drive values for pixels to be illuminated in the future, and a look-ahead circuit that includes a peak detector to detect a peak future drive value in at least a portion of the pixel buffer, and where the look-ahead circuit determines future programmable voltages in response to the future drive values stored in the pixel buffer such that the future programmable voltages follow future changes in the junction voltage resulting from the future drive values stored in the pixel buffer plus a voltage headroom value.