Light source response compensation for light projection system using a graphics processing unit

A method, comprising steps of:

• a) generating a drive control signal for a mirror driver that generates a mirror drive signal in response to the drive control signal, the drive control signal being generated so that transitions of the mirror drive signal occur at expected peaks of an expected mirror sense signal;
• b) receiving an actual mirror sense signal from a microelectromechanical (MEMS) mirror driven by the mirror drive signal;
• c) detecting zero crosses of the actual mirror sense signal;
• d) determining when the actual mirror sense signal actually peaks as a function of the detected zero crosses;
• e) adjusting the drive control signal such that the transitions of the mirror drive signal occur at the actual peaks of the actual mirror sense signal;
• and
• f) returning to step b).

A light projection system, comprising:

• a microelectromechanical (MEMS) mirror configured to operate in response to a mirror drive signal and to generate a mirror sense signal as a result of the operation of the MEMS mirror in response to the mirror drive signal;
• a mirror driver configured to generate the mirror drive signal in response to a drive control signal;
• a controller configured to:
• a) receive the mirror sense signal from the MEMS mirror;
• b) obtain a first sample of the mirror sense signal at a first phase of the mirror drive signal;
• c) obtain a second sample of the mirror sense signal at a second phase of the mirror drive signal, wherein the first and second phases are separated by a half period of the mirror drive signal, with the second phase occurring after the first phase;
• and
• d) generate the drive control signal as a function of a difference between the first and second samples so as to keep the mirror drive signal separated in phase from the mirror sense signal by a desired amount of phase separation.

A light projection system, comprising:

• a microelectromechanical (MEMS) mirror configured to operate based on a mirror drive signal and to generate a mirror sense signal as a result of the operation of the MEMS mirror based upon the mirror drive signal;
• a mirror driver configured to generate the mirror drive signal in response to a drive control signal;
• a controller configured to:
• a) receive the mirror sense signal from the MEMS mirror;
• b) obtain first and seconds samples of the mirror sense signal;
• and
• c) generate the drive control signal such the first and second samples are equal.

A method, comprising steps of:

• a) generating a mirror drive signal in response to a drive control signal and applying the mirror drive signal to a microelectromechanical (MEMS) mirror to drive oscillation of that mirror;
• b) sampling a mirror sense signal produced by the MEMS mirror twice to produce first and second samples, the first sample being sampled when the mirror drive signal is at a first phase, the second sample being sampled when the mirror drive signal is at a second phase that occurs subsequent to the first phase by half a period of the mirror drive signal;
• c) determining a difference between the first and second samples;
• d) adjusting the drive control signal based upon the difference, if the difference is other than zero;
• and
• e) returning to step a).