LED Display Luminance Compensation via Aging History
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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, affecting image quality and performance.
Innovation Solution
A pixel luminance degradation compensator is implemented in electronic devices to store aging history information for each pixel, considering luminance, ambient light exposure, and temperature, and applies compensation factors to maintain accurate image display by adjusting pixel luminance values.
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 lifespan are improved, but luminance degradation and color shifts occur over time due to aging
Solution Approach 1:
The patent applies preliminary action by storing aging history information for each pixel in advance and computing compensation factors before displaying images. The system maintains a running record of each pixel's luminance history and environmental conditions, then uses this pre-collected data to calculate compensation factors that are applied to counteract anticipated aging effects, thereby maintaining display quality over the extended lifespan of LED pixels
Solution Approach 2:
The patent implements feedback by continuously monitoring pixel luminance history and environmental conditions (temperature, humidity, light exposure), then using this feedback information to compute compensation factors that adjust pixel drive signals. This closed-loop system measures actual pixel performance and aging conditions, then feeds this information back to modify driving parameters and compensate for degradation, maintaining stable luminance and color accuracy over time
2Measurement precision
If compensation factors are applied to each pixel, then luminance accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by implementing pixel-level compensation, where each pixel or pixel group has its own aging history record and compensation factor. The display is divided into individually manageable units, allowing precise tracking of luminance degradation and application of tailored compensation to each segment based on its specific usage history and environmental exposure, thereby achieving high luminance accuracy without requiring complete redesign of the entire display system
Solution Approach 2:
The patent implements self-service by enabling the display system to automatically monitor its own aging conditions through stored luminance history and environmental sensors, then autonomously compute and apply compensation factors without external intervention. The system uses its own operational data to self-correct luminance degradation, reducing the need for manual calibration or complex external compensation hardware
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 and an ambient light sensor. 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, ambient light exposure, and temperature measurements.