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

3.11 Average Diffraction Efficiency and Photopic Diffraction Efficiency

These fields are not user inputs. The output gives the calculated average diffraction efficiency and average photopic diffraction efficiency. The average diffraction efficiency is calculated by taking an average of the diffraction efficiency values across the specified wavelength spectrum. The photopic diffraction efficiency is taken by multiplying the diffraction efficiency with the normalized photopic response at the corresponding wavelengths. This is done as a summation taken across the entire wavelength spectrum. The result is then divided by the summation of the photopic response values across the wavelength spectrum.

Equation 2. P h o t o p i c   E f f i c i e n c y = ∑ λ i S λ i     P h o t λ i   D   i f f r a c t i o n   E f f i c i e n c y ( λ i ) ∑ λ i S λ i   P h o t ( λ i )

S (λi) is the source spectrum and Phot (λi) is the photopic curve. The average is then taken across the spectrum to show the value displayed in the application.

Diffraction pattern. Light inside the dotted blue line is collected by the projection optics. Light outside the dotted blue line is lost in diffraction lobes. Diffraction efficiency is light collected divided by total light. Figure 3-8 Diffraction pattern. Light inside the dotted blue line is collected by the projection optics. Light outside the dotted blue line is lost in diffraction lobes. Diffraction efficiency is light collected divided by total light.