SLAAEQ8 February   2025 MSPM0C1103 , MSPM0C1103-Q1 , MSPM0C1104 , MSPM0C1104-Q1 , MSPM0C1105 , MSPM0C1106 , MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G1518 , MSPM0G1519 , MSPM0G3105 , MSPM0G3105-Q1 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3505 , MSPM0G3505-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0G3518 , MSPM0G3518-Q1 , MSPM0G3519 , MSPM0G3519-Q1 , MSPM0H3216 , MSPM0L1117 , MSPM0L1227 , MSPM0L1227-Q1 , MSPM0L1228 , MSPM0L1228-Q1 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346 , MSPM0L2227 , MSPM0L2228 , MSPM0L2228-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Laser Speckle Reduction
    2. 1.2 MSPM0 Requirements
  5. 2PWM
    1. 2.1 PWM Implementation
    2. 2.2 PWM Test Result
  6. 3PWM and GPIO
    1. 3.1 PWM and GPIO Implementation
    2. 3.2 Interrupt Time Calibration
    3. 3.3 PWM and GPIO Test Result
  7. 4Timer and GPIO
    1. 4.1 Timer and GPIO Implementation
  8. 5Summary
  9. 6References

1.1 Laser Speckle Reduction

Laser Speckle Reduction (LSR), is a technology to reduce the laser speckle. In three color projector, there are several methods to reduce the laser speckle,
  • Process laser light at the source.
  • In the optical path, superimpose the random speckles to reduce the intensity of the speckles.

The common speckle superposition method is vibration. In the optical path, there are two general places to apply vibration,

  • Optical machine vibration.
  • Screen vibration.

Home and portable projectors are hard to add vibration to the screen, which increases the installation cost of the projector. Therefore, adding vibration to the projector optical machine is a low-cost method to reduce speckle.

Vibration is generally generated using coils or motors. This application note introduces the methods to generate the coils control PWM waveform using MSPM0.