OLED Pixel Degradation Compensation Circuit
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Solution Overview
Problem
Organic light-emitting diode (OLED) displays face pixel degradation (burn-in) issues due to varying degradation speeds of red, green, and blue sub-pixels, leading to color shift and limited compensation regions, where the blue sub-pixel's compensation region saturates first, causing ineffective compensation and color shift.
Innovation Solution
A processor with a pixel degradation compensation circuit that generates a current degradation value for sub-pixel data, adjusts it dynamically to slow down accumulation speed before saturation, and accumulates this value to maintain target brightness, applying 'dynamic decay factor accumulate speed' to prevent color shift and prolong sub-pixel life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the compensation value of sub-pixel data is increased to maintain target brightness of degraded sub-pixels, then the brightness attenuation is improved, but the compensation region (data upscaling space) becomes saturated first for blue sub-pixels, causing color shift
Solution Approach 1:
The patent applies dynamics by making the degradation accumulation speed adjustable rather than fixed. The controller dynamically changes the accumulation speed of decay factors based on real-time monitoring of compensation region usage, allowing the system to adapt between fast accumulation (when compensation space is abundant) and slow accumulation (when approaching saturation), thereby resolving the contradiction between maintaining brightness and preventing color shift
Solution Approach 2:
The patent implements feedback by continuously monitoring the compensation region status and using this information to adjust the degradation accumulation speed. The controller receives feedback about the current degradation level and compensation capacity, then adjusts the accumulation rate accordingly, creating a closed-loop control system that prevents color shift while maintaining brightness compensation effectiveness
2Illumination intensity
If the degradation accumulation speed is increased to compensate for faster degrading sub-pixels, then the target brightness is maintained, but the compensation region saturates faster causing color shift
Solution Approach 1:
The patent makes the degradation accumulation speed dynamic rather than static. The controller adjusts the accumulation speed based on the current state of the compensation region, allowing the system to maintain target brightness while extending the compensation region lifespan by slowing down accumulation when approaching saturation thresholds
Solution Approach 2:
The patent applies preliminary action by proactively adjusting the degradation accumulation speed before the compensation region becomes saturated. The controller monitors the compensation capacity in advance and reduces the accumulation rate when thresholds are approached, preventing color shift before it occurs rather than reacting after saturation happens
Data Source
AI summary
The disclosure provides a processor and a pixel degradation compensation method thereof. The processor includes a processing circuit and a pixel degradation compensation circuit. The pixel degradation compensation circuit generates a current degradation value based on current sub-pixel data. The current degradation value represents the degradation effect of the current sub-pixel data on a corresponding sub-pixel in a display module. The pixel degradation compensation circuit may adjust the current degradation value to generate an adjusted degradation value corresponding to the current sub-pixel data. The adjusted degradation value is accumulated to a total degradation value corresponding to the current sub-pixel data. The pixel degradation compensation circuit compensates the current sub-pixel data based on the total degradation value corresponding to the current sub-pixel data so as to generate compensated current sub-pixel data to the display module.