Subpixel Aging Compensation in Head-Mounted Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Head-mounted display systems experience reduced display quality over time due to non-uniform aging of subpixels, leading to luminance and color balance issues as subpixels emit less light and age at different rates.
Innovation Solution
A display calibration system determines compensation factors for each subpixel by measuring the electronic display's luminance and color balance, tracking usage, and applying a compensation matrix to adjust driving conditions, thereby compensating for aging and maintaining consistent display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subpixels are used to display images by combining different wavelengths of light, then display quality is initially good, but subpixels age at different rates causing luminance and color balance non-uniformity over time
Solution Approach 1:
The system performs preliminary characterization of each subpixel's aging rate during manufacturing or initial use. Compensation factors are pre-calculated and stored in a compensation matrix based on measured luminance and color balance data. This preliminary action allows the system to proactively compensate for aging effects before they manifest as visible display degradation, resolving the contradiction between maintaining display quality and extending display lifetime.
Solution Approach 2:
The patent applies local quality by creating a compensation matrix where each subpixel has its own unique compensation factors based on its individual aging characteristics. Instead of uniform compensation across the display, the system tailors compensation to each subpixel's specific location, color channel, and measured aging rate. This localized approach maintains overall display quality consistency while accounting for variations in subpixel aging patterns.
2Reliability
If compensation factors are determined for each subpixel to maintain display quality, then display quality consistency is improved, but system complexity increases due to tracking and calculation requirements
Solution Approach 1:
The display system performs self-characterization and self-compensation by automatically measuring its own subpixel performance and applying compensation factors. The system tracks its own usage patterns and aging progression without requiring external calibration equipment or manual intervention. This self-service approach reduces system complexity by eliminating separate calibration devices while maintaining display quality consistency through automated compensation.
Solution Approach 2:
The system implements feedback by continuously monitoring subpixel luminance and color balance output, comparing it against expected values, and adjusting driving conditions based on measured deviations. The compensation matrix is updated over time based on feedback from actual display performance, allowing the system to adapt to aging patterns and maintain quality consistency automatically.
Data Source
AI summary
A display calibration system determines compensation factors for each subpixel in an electronic display to compensate for non-uniformity due to aging of the electronic display. The system takes a first measurement of the display at an input setting, instructs the display to operate an input sequence, and takes a second measurement of the display at the same input setting. The system determines one or more compensation factors for each subpixel of the electronic display based on the first measurement, the second measurement, and one or more previous characterizations of a similar subpixel on a similar display. A compensation matrix may be stored in memory on an HMD that houses the electronic display, or it may be stored in the cloud and accessed when the display is operating.