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

3.6 Depth of Focus

The distance at which a projection lens achieves optimal focus is known as the plane of focus. Although focus is most precise at this plane, focus remains acceptable within a certain range both in-front and behind the plane of focus. The distance range of acceptable focus is referred to as the depth of focus.

DLP Display projection optical modules must be precisely focused on the target projection surface which is accomplished by adjusting the projection lens. This adjustment can be done manually, digitally with a stepper motor, or automatically using an external autofocus system (such as a camera or depth sensing system) in combination with a stepper motor.

Note: Manually focused optical modules are most common, and although autofocus options can increase costs, they simplify product setup and enhance usability for the consumer.