Adjustable Duty Cycle Display for AR Visual Artifacts
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Solution Overview
Problem
Close-eye display systems in augmented and virtual reality suffer from visual artifacts such as motion blur and judder due to head and eye movements, which can lead to simulator sickness and reduced performance.
Innovation Solution
The system dynamically adjusts the illumination pulse or duty cycle on an individual color channel basis for each pixel or group of pixels, using sensors to monitor movement data and a compensation circuit to modify the duty cycle in real-time, thereby reducing visual artifacts like motion blur and judder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame rate of the graphics system is increased to reduce visual artifacts, then the visual quality improves, but the graphics-processing resources are overly taxed
Solution Approach 1:
The patent segments the display into multiple color channels (red, green, blue) and applies different duty cycles to each channel independently. This allows the system to reduce persistence for channels that contribute more to motion blur perception while maintaining higher persistence for channels that provide stability, thereby improving visual quality without uniformly increasing processing load across all channels.
Solution Approach 2:
The patent applies local quality by assigning different persistence characteristics to different color channels based on their specific roles in the display. Green and blue channels receive reduced duty cycles to minimize motion blur, while red channels may maintain higher persistence for stability, optimizing visual artifacts locally across different spectral components.
2Manufacturing precision
If the illumination persistence is decreased to reduce motion blur, then the sharpness improves, but the brightness and lifetime of the display are affected
Solution Approach 1:
The patent implements dynamic duty cycle adjustment where the illumination persistence is not fixed but can be varied in real-time based on display conditions. The system dynamically reduces persistence for color channels that cause motion blur while maintaining higher persistence for channels that enhance stability, allowing optimal sharpness without uniformly sacrificing brightness across all channels.
Solution Approach 2:
The patent changes the duty cycle parameter independently for each color channel, allowing the system to optimize persistence for sharpness while compensating for brightness losses through targeted adjustments. By varying the duty cycle parameter dynamically and selectively, the system achieves improved sharpness without proportionally reducing overall display brightness.
3Reliability
If the duty cycle is reduced for all color channels to minimize visual artifacts, then motion blur and judder are reduced, but the overall brightness and image quality suffer
Solution Approach 1:
The patent segments the duty cycle control by color channel, applying reduced persistence selectively to channels that contribute most to motion blur (green and blue) while maintaining higher persistence for channels that provide stability (red). This segmented approach reduces visual artifacts without uniformly dimming the entire display.
Solution Approach 2:
The patent applies local quality by differentiating persistence characteristics across color channels based on their specific visual contributions. Green and blue channels receive lower duty cycles to minimize motion blur, while red channels maintain higher persistence for stability, achieving artifact reduction without sacrificing overall brightness.
Data Source
AI summary
Methods and systems relating generally to information displays, and more particularly to systems and methods for setting or dynamically adjusting the illumination pulses of a display or portions of a display on an individual color channel (typically R, G, B) basis. The illumination pulses may be adjusted for a plurality of frames at once, or on a frame by frame basis. The illumination pulses may be controlled for an entire image frame, or the illumination pulse may be controlled on a finer basis, for instance on separate areas or sub-regions of a display. Such adjustments can lead to improved sharpness, brightness, or useable lifetime of the display, and can eliminate or reduce discrepancies of visual artifacts in the visual field by providing separate or variable duty cycle capability on an individual color channel basis to the display for use in combination with display images, particularly for use with close-eye display orientations such as those used in augmented reality or virtual reality applications.