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

6.1 Light Output vs. Eyebox and Field of View

The total light output (lumens) required to create the virtual image at the eyebox depends on the desired maximum brightness intensity of the virtual image, the area of the eyebox, and the FOV.

As stated before, virtual image distance (VID) has no impact on the total light required, even though the virtual image size grows with VID for a given FOV.

The following formula provides an approximation of the total light (lumens) required for a rectangular eyebox:

eqn0.png

Where

Total_Light — Total light at pupil in lumens

EyeBoxX — X dimension of eyebox in meters

EyeBoxY — Y dimension of eyebox in meters

Brightnessintensity — Maximum brightness intensity of virtual image in nits or cd/m2 (typically 10,000 nits to 15,000 nits)

HFOV — Horizontal field of view

VFOV — Vertical field of view

Estimated total light (reflected to driver's eyebox) for

140 mm × 60 mm eyebox, 12° × 6° FOV and max virtual image brightness 15,000 nits ≈ 2.78 lumens