DLPA078B February   2017  – September 2021 DLP160AP , DLP160CP , DLP2000 , DLP2010 , DLP230GP , DLP230KP , DLP230NP , DLP3010 , DLP3310 , DLP4710 , DLP471TP , DLPC3420 , DLPC3421

 

  1.   Trademarks
  2. 1 Introduction to Optical Modules
    1. 1.1 DLP Pico Chip or Digital Micromirror Device (DMD)
    2. 1.2 Illumination
    3. 1.3 llumination Optics
    4. 1.4 Projection Optics
    5. 1.5 Flash Memory Board
  3. 2 Use Case Considerations
    1. 2.1 Optical Module Specifications
  4. 3 Core Optical Module Specifications
    1. 3.1 Brightness
    2. 3.2 Size
    3. 3.3 Resolution
    4. 3.4 Illumination Power Consumption
    5. 3.5 Throw Ratio
    6. 3.6 Offset
    7. 3.7 Contrast Ratio
  5. 4 Additional Optical Module Specifications
    1. 4.1 Brightness Uniformity
    2. 4.2 Focus Uniformity
    3. 4.3 Color Management
    4. 4.4 Illumination Type
    5. 4.5 Thermal Management
    6. 4.6 Optical Zoom
    7. 4.7 Depth of Focus
    8. 4.8 Focus Method
    9. 4.9 Automatic White Point Correction
  6. 5 Features Implemented in Software
    1. 5.1 Keystone Correction
    2. 5.2 DLP Image Processing Settings
    3. 5.3 DLP IntelliBright Algorithms
  7. 6 Hardware Integration Considerations
    1. 6.1 Flash Memory
    2. 6.2 DLP Controller to DMD Interface
    3. 6.3 Flash Memory to DLP Controller Interface
  8. 7 Business Considerations
    1. 7.1 Cost
    2. 7.2 Custom Optical Modules
    3. 7.3 Minimum Order Quantity (MOQ)
    4. 7.4 Lead Times
  9. 8 Example Optical Module Specification Table
  10. 9 Get Started with Development
  11. 10Revision History

4.7 Depth of Focus

The distance at which a projection lens is focused is referred to as the “plane of focus.” While the focus is best at the plane of focus, the focus is often acceptable for some distance in front of and behind the plane of focus. This distance range over which the focus is acceptable is referred to as the “focus depth”.

A long depth of focus is generally desirable, especially for portable applications such as pico projections built in to smartphones or tablets. The longer the depth of focus, the more the product can be moved relative to the surface and still be considered in focus.