DLPA078C February   2017  – October 2024 DLP160AP , DLP160CP , DLP2000 , DLP2010 , DLP230GP , DLP230KP , DLP230NP , DLP3010 , DLP3310 , DLP4710 , DLP471TP , DLPC3420 , DLPC3421

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction to Optical Modules
    1. 1.1 DLP Display Chip or Digital Micromirror Device (DMD)
    2. 1.2 Illumination
    3. 1.3 Illumination Optics
    4. 1.4 Projection Optics
    5. 1.5 Flash Memory Board
  5. 2Core Optical Module Specifications
    1. 2.1 Brightness
    2. 2.2 Size
    3. 2.3 Resolution
    4. 2.4 Illumination Power Consumption
    5. 2.5 Throw Ratio
    6. 2.6 Offset
    7. 2.7 Contrast Ratio
  6. 3Additional Optical Module Specifications
    1. 3.1 Brightness Uniformity
    2. 3.2 Focus Uniformity
    3. 3.3 Color Management
    4. 3.4 Thermal Management
    5. 3.5 Optical Zoom
    6. 3.6 Depth of Focus
  7. 4Optical Module Specification Examples
  8. 5Get Started with Development
  9.   Revision History

2.5 Throw Ratio

Throw ratio (see Figure 2-3) describes how large of a projected image an optical module creates at a given distance from the projection surface. The throw ratio is defined as the ratio of D (the distance from the final optical element to the projection surface) to W (width of projected image). For example:

  • Optical module with a throw ratio of 1.4 projects a 17” wide projected image from 24” away
  • Ultra-short throw optical module with a throw ratio of 0.3 projects an 80” wide projected image from 24" away

A shorter throw ratio requires larger projection lenses and mirrors, increasing the size of the optical module. For more information regarding throw ratio, see slide 69 of the DLP Optical Design Guidelines presentation.

DLP2000, DLP2010, DLP230NP, DLP3010 Throw Ratio Figure 2-3 Throw Ratio