OLED Pixel Compensation Circuit for Burn-In Color Balance
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Solution Overview
Problem
Organic light-emitting diode (OLED) displays suffer from pixel degradation (burn-in) due to different degradation speeds of red, green, and blue sub-pixels, leading to color shifts when compensation regions for one color become saturated while others are not, limiting the display's lifespan.
Innovation Solution
A processor with a pixel degradation compensation circuit adjusts the grayscales of all sub-pixel data based on historical degradation effects, generating compensated image frame data to slow down degradation accumulation and extend the lifespan of the display by reducing additional compensation current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If grayscale compensation is applied to degraded sub-pixels, then brightness attenuation is improved, but compensation region saturation occurs faster leading to color shifts
Solution Approach 1:
The patent applies preliminary grayscale adjustment to all sub-pixel data before degradation compensation is applied. By pre-adjusting grayscales based on historical degradation effects, the system prepares the sub-pixel data in advance to slow down degradation accumulation, delaying the saturation of compensation regions and preventing color shifts during operation
Solution Approach 2:
The patent changes the grayscale parameter of sub-pixel data dynamically based on historical degradation effects. By adjusting grayscale values before compensation and using total degradation values to modify compensation amounts, the system optimizes the balance between brightness maintenance and compensation region sustainability across different colored sub-pixels
2Illumination intensity
If additional compensation current is applied to degraded sub-pixels, then brightness is maintained, but sub-pixel circuit lifetime is reduced
Solution Approach 1:
The patent applies preliminary grayscale adjustment to reduce the magnitude of subsequent compensation current requirements. By pre-adjusting grayscales to account for historical degradation, the system reduces the additional compensation current needed, thereby extending sub-pixel circuit lifetime while maintaining brightness
Solution Approach 2:
The patent uses total degradation values derived from historical degradation effects as feedback to dynamically adjust grayscale values and compensation amounts. This feedback mechanism ensures that compensation current is optimized based on actual degradation progression, preventing excessive current application that would reduce circuit lifetime
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 is coupled to the processing circuit to receive image frame data. The pixel degradation compensation circuit adjusts the grayscales of all sub-pixel data of the image frame data based on a grayscale adjustment rate corresponding to the image frame data to generate adjusted image frame data. The pixel degradation compensation circuit generates a total degradation value corresponding to current sub-pixel data in the adjusted image frame data based on 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 to generate compensated current sub-pixel data in compensated image frame data to a display module.