DLPA083B june   2019  – april 2023 DLP2000 , DLP2010 , DLP230KP , DLP230NP , DLP3010 , DLP3030-Q1 , DLP3310 , DLP4620S-Q1 , DLP470NE , DLP470TE , DLP4710 , DLP471NE , DLP471TE , DLP471TP , DLP480RE , DLP500YX , DLP5500 , DLP550HE , DLP550JE , DLP5530-Q1 , DLP5530S-Q1 , DLP5531-Q1 , DLP5533A-Q1 , DLP6500FLQ , DLP6500FYE , DLP650LE , DLP650LNIR , DLP650NE , DLP650TE , DLP651NE , DLP660TE , DLP670RE , DLP670S , DLP7000 , DLP7000UV , DLP780NE , DLP780TE , DLP781NE , DLP781TE , DLP800RE , DLP801RE , DLP801XE , 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

3 Window Properties

The two main types of DMD windows are directly related to the packaging types:

  • Type A DMD packaging uses Corning 7056 glass (typically about 3 mm thick).
  • Wafer Level Packaging (WLP, often referred to as Sxxx package) uses Corning Eagle XG glass (typically about 1 mm thick or less).

Both the WLP window and the Type A window have an anti-reflective thin film coating to reduce reflections and increase transmission efficiency. Depending on the application, either the visible, UV, or NIR coating is used.

The values below describe a single pass of visible light (420 nm–680 nm) with random polarization through the window, and accounting for two surface coatings.

  • Average transmittance, Tave ≥ 99% at all angles 0–30° AOI,
  • Average transmittance, Tave ≥ 97% at all angles 30–45° AOI

All transmittance values are the total transmittance of the window (through both surfaces and glass). A transmission number of 96% is used in the Table 6-1 calculation representing a double pass through the window with approximately 99% transmission at each coated surface. See the DMD data sheets for device specific values.

For more information on window transmittance, see Wavelength Transmittance Considerations for DLP® DMD Window.