DLPA083B june   2019  – april 2023 DLP2000 , DLP2010 , DLP230KP , DLP230NP , DLP3010 , DLP3310 , DLP4620S-Q1 , DLP4710 , DLP471TP , DLP500YX , DLP5500 , DLP5530S-Q1 , DLP5531-Q1 , DLP5533A-Q1 , DLP6500FLQ , DLP6500FYE , DLP650LNIR , DLP670S , DLP7000 , DLP7000UV , DLP9000 , DLP9000X , DLP9000XUV , DLP9500 , DLP9500UV

 

  1.   Abstract
  2.   Trademarks
  3. 1Purpose and Scope
    1. 1.1 Limitations
    2. 1.2 Acronyms Used in This Document
  4. 2On-State Fill Factor
  5. 3Window Properties
  6. 4Mirror Diffraction Efficiency
    1. 4.1 Mirror Flatness
    2. 4.2 Mirror Diffraction Efficiency
    3. 4.3 Diffraction Efficiency with Mismatched Illumination and Projection f-numbers
  7. 5Mirror Reflectivity
  8. 6Estimating Overall DMD Efficiency
  9. 7References
  10. 8Revision History

1 Purpose and Scope

The next three sections discuss the fill factor, window optical properties, and the active mirror array properties, respectively. This report concludes with a discussion on calculating the overall efficiency.

As discussed in more detail in Section 6, overall optical efficiency can be estimated using
Equation 1.

Equation 1. EfficiencyDMD = transmissionwindow × efficiencyfillfactor × efficiencydiffraction × reflectivitymirror × transmissionwindow

where

  • transmissionwindow is single-pass window transmission including two anti-reflection surfaces. This term is accounted for twice because light travels through the window twice.
  • efficiencyfillfactor is the fractional mirror coverage (on-state mirrors) as viewed from the illumination direction
  • efficiencydiffraction is the mirror array diffraction efficiency which can include effects of non-flat mirrors
  • reflectivitymirror is the mirror reflectivity including mirror scatter

Overall DMD efficiency is generally a product of fill factor, window transmission, diffraction efficiency, and mirror reflectivity, which are described in more detail in the following sections.