Dispersion Correction Profile for HMD Optical Assemblies
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Solution Overview
Problem
Head-mounted displays (HMDs) face challenges in presenting accurate virtual images due to color dispersion in optical assemblies, leading to undesirable color shifts caused by different wavelengths of light being focused at varying angles, affecting brightness and chromaticity.
Innovation Solution
A dispersion adjustment profile is applied to the image, specific to the optical assembly, which adjusts the brightness values of red, green, and blue subpixels based on their bending angles and chief ray angles to correct for color dispersion, ensuring accurate chromaticity and image fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical assembly is used with the display to focus images as virtual images, then the user experience and feeling of presence are enhanced, but color dispersion causes undesirable color shifts in the virtual image
Solution Approach 1:
The system performs preliminary color correction by adjusting the color values of pixels in the generated image content before it is displayed. A color correction profile is applied that pre-compensates for the specific color dispersion characteristics of the optical assembly, ensuring that the colors remain accurate after passing through the dispersive optical elements.
Solution Approach 2:
The color correction is applied locally to different regions of the display. The system determines a chief ray angle for each pixel position and applies position-specific color correction values from the color correction profile, allowing each region to be corrected according to its specific optical path and dispersion characteristics.
2Measurement precision
If different wavelengths of light are focused at varying angles by the optical assembly, then image focusing is achieved, but brightness and chromaticity accuracy deteriorate
Solution Approach 1:
The system changes the color parameters (RGB values) of pixels based on their position and chief ray angle. By modifying the color values according to a predetermined color correction profile that accounts for wavelength-dependent dispersion, the system compensates for both brightness variations and chromaticity shifts caused by different focusing angles of different wavelengths.
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 solution effectively corrects color dispersion, ensuring that virtual images presented to the user match the intended white color target, improving image fidelity and user experience by accurately rendering chromaticity across the display pixel array.
Implementation Method 1
an optical assembly is used with the display to focus images rendered to the display as virtual image for users of the HMD
Implementation Method 2
color dispersion properties of the optical assembly... different wavelengths of light being focused at varying angles
Data Source
AI summary
An image is received that includes red, green, and blue subpixel values for each pixel in the image. A dispersion adjustment profile is applied to the image to generate a dispersion-corrected image. The dispersion adjustment profile is specific to an optical assembly disposed over a display pixel array of a head mounted display. The dispersion-corrected image is rendered to the display pixel array of the head mounted display.