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

2.4.3 Design Summary

The design tradeoffs presented in this document can be used to determine hardware capability and requirements for a HUD design. The example HUD design specification from Section 2.4 is:

  • FOV: 10° × 5°
  • Eyebox: 140 mm × 60 mm
  • VID: 10 m
  • Contrast: 1500:1
  • Resolution: > 80 ppd
  • Temperature rating: –40°C to 105°C

Figure 2-3 shows a HUD with this FOV and eyebox will require about 55 lumens output from the PGU. Figure 2-9 shows that the CSL LEDs will output around 90 lumens at with f/2.6 optics. The CSL LEDs will provide enough brightness margin to account for LED efficiency roll-off at high temperatures while minimizing typical power consumption. Figure 2-8 shows that with f/2.6 optics, a HUD design can realize a 1500:1 contrast ratio. Using the DLP3030-Q1 DMD with a horizontal FOV of 10° gives a resolution of 86 ppd. The DLP3030-Q1 chipset is fully automotive qualified with a temperature rating of –40°C to 105°C.

This example HUD design is well suited to use the DLP3030-Q1 chipset.