LED Display Pixel Luminance Degradation Compensation
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Solution Overview
Problem
Electronic device displays, particularly those with light-emitting diodes, experience luminance degradation and color shifts over time due to aging effects, affecting display performance.
Innovation Solution
A pixel luminance degradation compensator is implemented in the electronic device to store aging history information for each pixel, computing compensation factors based on luminance and temperature data to adjust pixel luminance values, ensuring stable and accurate image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If light-emitting diodes are used in display pixels, then energy efficiency and longevity are improved, but luminance degradation and color shifts occur over time due to aging effects
Solution Approach 1:
The system performs preliminary action by storing aging history information for each pixel in advance and computing compensation factors before displaying images. The compensation factors are calculated based on accumulated aging data and applied to adjust pixel luminance values, preventing luminance degradation and color shifts from affecting display quality.
Solution Approach 2:
The system implements feedback by continuously monitoring pixel aging through stored aging history information and using this data to compute compensation factors. These factors are applied to adjust pixel luminance values in real-time, creating a closed-loop system that compensates for aging effects and maintains display performance.
2Reliability
If compensation factors are computed and applied to each pixel, then luminance stability is improved, but device complexity increases
Solution Approach 1:
The system applies segmentation by maintaining separate aging history information for each individual pixel and computing unique compensation factors for each pixel. This per-pixel approach allows precise compensation for aging effects while enabling selective application of compensation only where needed, rather than uniformly across the entire display.
Solution Approach 2:
The system implements parameter changes by dynamically adjusting pixel luminance values based on computed compensation factors. The compensation factors modify the luminance parameters of individual pixels according to their specific aging history, allowing the display to adapt to aging effects through parameter adjustment rather than hardware modification.
Data Source
AI summary
An electronic device may be provided with a display. A content generator may generate frames of image data to be displayed on the display. The display may have an array of pixels that emit light to display images. The pixels may contain light-emitting devices such as organic light-emitting diodes, quantum dot light-emitting diodes, and light-emitting diodes formed from discrete semiconductor dies. As a result of aging, the light producing capabilities of the light-emitting devices may degrade over time. The electronic device may have a temperature sensor that gathers temperature measurements. A pixel luminance degradation compensator may apply compensation factors to uncorrected pixel luminance values associated with the frames of image data to produce corresponding corrected pixel luminance values for the display. The compensation factors may be based on aging history information such as pixel luminance history and temperature measurements.