DLPA073A September   2016  – September 2016 DLP2010 , DLPC2607 , DLPC3430 , DLPC3435

 

  1.   TI DLP Pico Technology for Aftermarket Head-up Displays
    1.     Trademarks
    2. 1 Introduction
    3. 2 Applicable Documents
    4. 3 Terminology
      1. 3.1 Types of AM-HUD
      2. 3.2 HUD Terminology
    5. 4 AM-HUD Key Requirements
      1. 4.1 Field of View
      2. 4.2 Resolution
      3. 4.3 Virtual Image Distance
      4. 4.4 Eyebox
      5. 4.5 Image Brightness
    6. 5 AM-HUD System
    7. 6 AM-HUD System Design Trade-Offs
      1. 6.1 Light Output vs. Eyebox and Field of View
      2. 6.2 Combiner and Diffuser Specification
        1. 6.2.1 Diffuser Screen Dimensions
        2. 6.2.2 Combiner Specification
      3. 6.3 Projection Unit Specification
    8. 7 Electronic System
    9. 8 Conclusions and Getting Started
  2.   Revision History

6.2.2 Combiner Specification

The combiner optical element can be made using injection molded plastic lens technology. It should be coated for 20-25% reflectivity.

There are two optical design choices for combiner and fold mirrors:

  • Option 1 — The combiner is a free-form surface, with the fold mirror as a plane (flat) mirror.
  • Option 2 — The combiner is a spherical surface, with the fold mirror as a free-form surface for the appropriate optical correction.

The following expressions can be used to estimate size of the combiner:

eqn_ar_3a.png

Combiner dimensions for reference design:

eqn_ar_3b.png

The optical specifications of the combiner will be a free-form surface. It will depend on the material and manufacturing process.