Dynamic Color Uniformity Correction in XR Waveguide Displays
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Solution Overview
Problem
Achieving uniform color across a display, particularly in waveguide-based extended reality (XR) systems, is challenging due to variations in optical out-coupling efficiency and geometric design, leading to non-uniformity in light emission across different wavelengths.
Innovation Solution
A display system dynamically adjusts color uniformity correction in response to changes in brightness, applying minimal correction at high brightness levels and increasing correction at low brightness levels, with individual adjustment of color uniformity scaling factors for each color channel and fine-tuning illumination time to optimize performance across various brightness levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If waveguide technology is used to guide light in XR displays, then compactness and light direction efficiency are improved, but color uniformity deteriorates due to variations in optical out-coupling efficiency across different wavelengths
Solution Approach 1:
The patent applies local quality by adjusting the electrical stimulus magnitude to emitters (LEDs) based on their specific location within the display system. Different regions receive different stimulus levels to compensate for location-dependent optical out-coupling variations in the waveguide, thereby achieving uniform color output across the entire display area despite the compact waveguide structure
Solution Approach 2:
The patent changes the electrical stimulus parameter (current magnitude) applied to individual emitters to compensate for wavelength-dependent and location-dependent optical out-coupling efficiency variations. By dynamically adjusting this parameter, the system corrects color non-uniformity while maintaining the compact waveguide design
2Illumination intensity
If electrical stimulus magnitude is increased to improve brightness, then light emission intensity is improved, but color non-uniformity worsens due to variations in optical out-coupling efficiency across wavelengths
Solution Approach 1:
The patent applies local quality by individually adjusting the electrical stimulus magnitude for each emitter or region based on its specific characteristics and location. This localized adjustment ensures that brightness is optimized while simultaneously compensating for location-specific optical out-coupling variations, achieving both high brightness and color uniformity
Solution Approach 2:
The patent implements dynamic adjustment of electrical stimulus magnitudes based on detected color non-uniformity and desired brightness levels. The system continuously adapts the stimulus parameters to maintain optimal color uniformity across the display while achieving the target brightness, rather than using fixed stimulus levels
3Manufacturing precision
If color uniformity correction is applied across all brightness levels, then color uniformity is improved, but energy consumption increases significantly
Solution Approach 1:
The patent implements dynamic color uniformity correction that adapts to the current brightness level. At lower brightness levels where color non-uniformity is more perceptible, the system applies more aggressive correction with higher stimulus adjustments. At higher brightness levels where uniformity is less critical, the system reduces correction intensity, thereby extending battery life while maintaining acceptable color uniformity across all operating conditions
Solution Approach 2:
The patent changes the degree of color uniformity correction applied based on the brightness level parameter. The electrical stimulus adjustment magnitude is modulated according to the operating conditions, applying maximum correction only when necessary (at low brightness) and reducing correction at high brightness to conserve energy
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
Enhances display uniformity and extends brightness range without significantly impacting battery life, providing an improved visual experience under diverse operating conditions.
Implementation Method 1
Light-emitting diode (LED) technology is used in modern display systems... LEDs are semiconductor devices that emit light when an electrical current passes through them. The brightness of an LED is directly related to the amount of current driven through it
Implementation Method 2
Waveguides are optical components that guide light from the LED backlight or other light source to the viewer's eye
Data Source
AI summary
A display system for color correcting a display. An emitter of the display is configured to receive an electrical stimulus having a magnitude, and emit an amount of light that increases with increased magnitude of the electrical stimulus. A display controller is configured to apply an amount of color non-uniformity correction to the display to adjust respective amounts of light of two or more wavelengths emitted by the display, the amount of color non-uniformity correction applied decreasing with increased magnitude of the electrical stimulus.