Conclusion
The laser scanned-MEMS projection system is better suited for automotive augmented reality HUDs than the alternative DLP or LCD frame-based display systems. It has the lowest thermal heat generation, and when a laser HUD scanned image only has 25% to 30% of its pixels turned on, the DLP and LCD HUD will require 100% of its image pixels driven to generate the same amount of brightness (current) as the laser HUD. DLP and LCD systems throw away light in order to display a black pixel, but with the laser scanned-MEMS projection system, a black pixel is truly black because the laser diode is turned off and is not consuming power or generating thermal heat.
The DLP and LCD optical architectures do not fully turn off a black pixel, so there is some level of leakage due to the display panel’s surface reflectivity. This results in a slight bright spot where the black pixels area should be. During daytime sunlight, this envelope might not be an issue, but at night, it is much more apparent. From a driver safety perspective, it becomes another distraction, and tips the scale in favor of automakers moving to the laser scanned-MEMS projection system for their next generation HUD.
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