AR DLP Color Sequencing to Prevent Ghosting and Color Breakup
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Solution Overview
Problem
DLP projectors used in augmented reality (AR) devices experience issues such as ghosting, color breakup, and high pixel persistence when used in mobile applications due to user motion, leading to poor image quality and user experience.
Innovation Solution
Configure DLP projectors to generate a single RGB color sequence repetition per image frame, identify the color sequence of the light source component, and reduce pixel persistence to mitigate these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DLP projectors are used in AR devices with traditional color sequence settings, then the device can operate with standard settings, but ghosting and color breakup occur due to user motion
Solution Approach 1:
The system performs preliminary identification of the light source color sequence (RGB, BGR, or other variations) and configures the color plane rendering accordingly before displaying virtual content. This preliminary configuration prevents ghosting and color breakup by ensuring the color planes are rendered in the correct sequence matching the light source output, eliminating the harmful effects before they can manifest during user motion.
2Loss of information
If multiple color sequence repetitions are used per image frame, then color information is more complete, but pixel persistence increases causing image smearing
Solution Approach 1:
The system changes the parameter of color sequence repetitions from multiple per frame to exactly one repetition per frame. This parameter change reduces pixel persistence and eliminates image smearing while maintaining complete color information by ensuring all three color planes (R, G, B) are rendered in the single repetition sequence, optimized for motion scenarios in AR.
3Reliability
If the light source generates multiple color sequences per frame, then color rendering is more robust, but motion artifacts increase during user motion
Solution Approach 1:
The system preliminarily identifies the light source color sequence type and configures the rendering pipeline to generate exactly one color sequence per frame matching that identified pattern. This preliminary configuration ensures color rendering robustness by adapting to the specific light source while simultaneously minimizing motion artifacts by limiting the number of color sequences displayed during frame rendering.
Data Source
AI summary
A method for configuring a digital light projector (DLP) of an augmented reality (AR) display device is described. A light source component of the DLP projector is configured to generate a single red-green-blue color sequence repetition per image frame. The AR display device identifies a color sequence of the light source component of the DLP projector and tracks a motion of the AR display device. The AR display device adjusts an operation of the DLP projector based on the single red-green-blue color sequence repetition, the color sequence of the light source component of the DLP projector, and the motion of the AR display device.