TIDUEE5A October   2018  – May 2022

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagrams
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 DLP3030-Q1
      2. 2.3.2 DLPC120-Q1
      3. 2.3.3 TMS320F28023
    4. 2.4 System Design Theory
      1. 2.4.1 Head-up Display Parameter Design and Tradeoffs
        1. 2.4.1.1 Field of View and Eyebox
        2. 2.4.1.2 Resolution
        3. 2.4.1.3 Virtual Image Distance
      2. 2.4.2 Picture Generation Unit Design Decisions
        1. 2.4.2.1 Etendue Efficiency Match
        2. 2.4.2.2 Aperture Size: Selecting f/# of Optics
        3. 2.4.2.3 Thermal Design
        4. 2.4.2.4 LED Selection Summary
      3. 2.4.3 Design Summary
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Software
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Test Results
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Cadence Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks
  12. 7Terminology
  13. 8Revision History

2.4.1.3 Virtual Image Distance

VID is a very important system design parameter. It does not have a large effect on required brightness, but it drastically changes the solar loading of the imager. AR HUDs perform well with longer virtual image distances, 7.5 m and above. This allows the displayed image to conformally overlay information on the road and cars in front of the driver for a seamless image. These long virtual image distances collect and focus more sunlight back into the HUD system. This solar load can cause problems with absorptive display devices such as TFT panels, increasing the temperature beyond rated conditions. A DLP3030-Q1 based projection system uses a transmissive diffuser screen to create the displayed image. Sunlight collected and incident on this screen is both transmitted and dispersed, minimizing temperature rises of the screen and reducing light concentration on the optics behind the screen. This enables a DLP3030-Q1 based HUD design to support a VID > 15 m.

For more information on the effects of solar load and virtual image distance, please see DLP® Technology: Solar loading in augmented reality head-up display systems white paper.

GUID-FF72E281-090E-4F47-9180-8766EF98886F-low.gif Figure 2-5 Increased Sunlight Concentration With a Longer Virtual Image Distance

The brightness, resolution, and long virtual image distances enabled by the DLP3030-Q1 DMD and chipset allows for HUD systems with bright images, large eyeboxes, and sharp displays.