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  • Dynamic Ground Projection Application Requirements

    • DLPA116 October   2020 DLP2021-Q1 , DLP3021-Q1

       

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  • Dynamic Ground Projection Application Requirements
  1.   Trademarks
  2. 1Static projection in automotive applications
  3. 2Brightness Requirements
    1. 2.1 Main Parameters that Influence Display Brightness
      1. 2.1.1 Ambient Lighting Conditions
      2. 2.1.2 Projection Surface Impact on Display Brightness
      3. 2.1.3 Size of the Displayed Image
      4. 2.1.4 Brightness of the Displayed Image
    2. 2.2 Other Brightness Considerations
      1. 2.2.1 Time of Day
      2. 2.2.2 Projector Contrast
      3. 2.2.3 Other Application Constraints
    3. 2.3 Brightness Capabilities with DLP Technology
  4. 3Summary
  5. 4References
  6. IMPORTANT NOTICE
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APPLICATION NOTE

Dynamic Ground Projection Application Requirements

Trademarks

DLP is a registered trademark of Texas Instruments Incorporated.

All other trademarks are the property of their respective owners.

1 Static projection in automotive applications

There are several examples of automotive implementations of static projector applications, from door panel logo projectors producing small images and rocker panel projection along the length of the car, to general welcome lighting projected around the vehicle. There are also countless aftermarket implementations available. These previous implementations help set the expectations and requirements for future implementations with dynamic content.

2 Brightness Requirements

Projectors for automotive applications can have varying optical flux requirements, around 100 lumens for some augmented reality head-up display systems and over 1500 lumens for some high resolution headlight systems. Dynamic ground projector (DGP) applications also have varying flux requirements, but will typically be below 50 lumens. The main parameter that determines the required brightness in a DGP application is display size, but there are also several parameters that might restrict maximum brightness such as required mechanical form factor, required power limit, ambient brightness, or desired thermal performance.

There are two main units used to determine the brightness of a projector or a display. The optical flux of a projector is typically measured in lumens (lm), a measurement of the total light output of the projector, while the brightness, or luminance, of a display is typically measured in candela per meters squared (cd/m2), or nits. The relationship between luminance [cd/m2], illuminance [lux], and optical flux [lumens] are described in the equations below.

 

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