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

5 AM-HUD System

The system block diagram of an AM-HUD is shown in Figure 9. A standard optical engine incorporating DLP Pico projection display technology can be used for AM-HUD. A customer can make necessary system level trade-offs to leverage a wide range of optical engines available from suppliers and not require a custom development.

The projector incorporating DLP technology projects an image on the diffuser screen. A combination of mirror(s) and combiner create a virtual image in front of the viewer’s eyes, as shown in Figure 10. Normally the fold mirror(s) is a flat mirror, and the combiner is a free-form plastic with 20-25% reflectivity. Since the FOV is relatively small, one can use a diffuser screen with very high gain. This reduces the total light output required from the projection unit. A diffuser screen with 20× gain is recommended for AM-HUD applications.

The diffuser screen (in this example a transmissive screen) and one fold mirror can be replaced with a single "reflective diffuser" screen. This may help reduce the overall size of the AM-HUD product.

image9.pngFigure 9. DLP AM-HUD System Simplified Block Diagram
image10.pngFigure 10. Virtual Image

* These variables are defined in Table 3.