DLPU140A May   2024  – September 2025 DLP160AP , DLP160CP , DLP2000 , DLP2010 , DLP2010LC , DLP2010NIR , DLP2021-Q1 , DLP230GP , DLP230KP , DLP230NP , DLP300S , DLP3010 , DLP3010LC , DLP301S , DLP3020-Q1 , DLP3021-Q1 , DLP3030-Q1 , DLP3034-Q1 , DLP3310 , DLP4500 , DLP4500NIR , DLP4620S-Q1 , DLP4621-Q1 , DLP470NE , DLP470TE , DLP4710 , DLP4710LC , DLP471NE , DLP471TE , DLP471TP , DLP480RE , DLP500YX , DLP5500 , DLP550HE , DLP550JE , DLP5530-Q1 , DLP5530S-Q1 , DLP5531-Q1 , DLP5531A-Q1 , DLP5532-Q1 , DLP5533A-Q1 , DLP5534-Q1 , DLP6500FLQ , DLP6500FYE , DLP650LE , DLP650LNIR , DLP650NE , DLP650TE , DLP651LE , DLP651NE , DLP660TE , DLP670RE , DLP670S , DLP7000 , DLP7000UV , DLP780NE , DLP780TE , DLP781NE , DLP781TE , DLP800RE , DLP801RE , DLP801XE , DLP9000 , DLP9000X , DLP9000XUV , DLP9500 , DLP9500UV

 

  1.   1
  2.   Abstract
  3. 1DMD Diffraction Efficiency Calculator Functionality
  4. 2Installation and setup
  5. 3Input Parameters
    1. 3.1  Pixel Models (DMD Micromirror)
    2. 3.2  Parameter Sweeps
    3. 3.3  Wavelength
    4. 3.4  Illumination Angle of Incidence
    5. 3.5  Tilt Angle
    6. 3.6  ƒ/Number (Illumination and Projection)
    7. 3.7  Enhance Slider
    8. 3.8  Diffraction Energy Plot
    9. 3.9  Array Size
    10. 3.10 Output File Name
    11. 3.11 Average Diffraction Efficiency and Photopic Diffraction Efficiency
    12. 3.12 Apodization
    13. 3.13 Run Simulation
  6. 4Coordinate System
  7. 5Examples
    1. 5.1 High F/Number Illumination
    2. 5.2 Mismatched Illumination and Projection F/Number
    3. 5.3 Cantilever Versus Torsional With Same Pixel Pitch
    4. 5.4 Side Diamond Diffraction Pattern
    5. 5.5 Apodization
  8.   Trademarks
  9. 6References
  10. 7Revision History

3.4 Illumination Angle of Incidence

Typically, the illumination angle of incidence (AOI), defined as the central ray angle of the illumination light cone is twice that of the mirror tilt angle. However, the DMD is illuminated with a cone of light as shown in Figure 3-3. Standard illumination angles can be found in Table 3-1.

Illumination cone angle incident on a DMD Figure 3-3 Illumination cone angle incident on a DMD
Note:

α, the illumination half-cone angle, is equal to the DMD mirror tilt angle. The angle of incidence (AOI) is twice the mirror tilt angle and is defined from the normal to the DMD mirror array surface.