XR Display Color Correction for Waveguide Non-Uniformity
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Solution Overview
Problem
XR displays, particularly waveguide-based optical see-through displays, suffer from color non-uniformity issues that lead to distracting visual effects and chromatic binocular rivalry, affecting the realism and accuracy of presented images, especially in applications involving human skin tones and color matching with real-world content.
Innovation Solution
Implement techniques to correct color non-uniformity by adjusting the electrical stimulus applied to colored light elements in the display system, such as LEDs or LCOS panels, to modulate the amount and timing of light emission, and using color wheels to sequence color sub-frames, thereby ensuring uniform color distribution across the virtual image surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveguide-based optical see-through display is used, then transparency and virtual content overlay are enabled, but color non-uniformity occurs across the display surface
Solution Approach 1:
The patent applies local quality by dividing the display surface into multiple zones with different color correction parameters. Each zone has its own set of electrical stimulus adjustments tailored to compensate for local color non-uniformity characteristics, allowing the transparent display to maintain color accuracy across different regions while preserving overall transparency.
Solution Approach 2:
The patent changes electrical stimulus parameters (voltage, current, pulse width) applied to the light-emitting elements across different zones of the display. By dynamically adjusting these parameters based on measured color non-uniformity data, the system compensates for variations in color output while maintaining the transparent optical see-through functionality.
2Manufacturing precision
If electrical stimulus adjustment is applied to colored light elements, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing color correction lookup tables (LUTs) for different zones of the display before operation. During actual use, the system simply retrieves and applies the appropriate correction parameters from these pre-computed tables, avoiding the need for complex real-time calculations and reducing operational complexity while maintaining color uniformity.
Solution Approach 2:
The patent introduces an intermediary color correction processing layer between the image source and the display elements. This intermediary layer handles the complex stimulus adjustment calculations and parameter transformations, isolating the complexity from both the image source and the physical display elements, thereby simplifying the overall system architecture.
3Reliability
If color correction techniques are implemented, then visual comfort and realism are improved, but processing time and computational resources increase
Solution Approach 1:
The patent performs color correction parameter calculations and stores lookup tables in advance, before actual display operation. This preliminary processing shifts the computational burden to an initialization phase, allowing the system to apply pre-computed corrections during operation with minimal processing time, thereby improving visual comfort without significantly increasing real-time processing requirements.
Solution Approach 2:
The patent applies color correction selectively to specific zones or regions of the display where non-uniformity is most pronounced, rather than uniformly across the entire display surface. This partial action approach reduces the overall computational load and processing time while still achieving the necessary visual comfort and realism improvements in the most critical areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The techniques improve the realism and accuracy of XR displays by mitigating color non-uniformity, reducing visual discomfort, and enhancing the presentation of uniform colors and consistent skin tones.
Implementation Method 1
each pixel of a display of the display system propagates a respective first amount of first light having a first wavelength and a respective second amount of second light having a second wavelength to form an image
Data Source
AI summary
Display systems, media, and methods. Pixels of an image former form an image. Each pixel has a first color element to propagate a first amount of a first light having a first wavelength, based on a first electrical stimulus, and a second color element to propagate a second amount of a second light having a second wavelength, based on a second electrical stimulus. A display surface presents the image across a plurality of display surface locations. A processor executes instructions to scale the first electrical stimulus of each pixel of the image former by a first light scale factor, scale the second electrical stimulus of each pixel of the image former by a second light scale factor, and apply a pixel shading map to the image former to independently adjust, for each pixel of the display, the first amount relative to the second amount.