OLED Pixel Aging Compensation Using Power-Voltage Grayscale Correction
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Solution Overview
Problem
Existing display devices, particularly organic light emitting displays, face issues with image sticking due to accumulated stress or degradation in pixels, which current compensation technologies fail to accurately address, leading to reduced image quality.
Innovation Solution
A display device with an image sticking compensator that calculates age data of light emitting elements based on power voltage, adjusts degradation data, and applies grayscale compensation values to input image data, using lookup tables and scaling to prevent saturation, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image sticking compensation is performed using conventional methods, then image sticking is compensated to some extent, but the compensation accuracy is insufficient leading to reduced image quality
Solution Approach 1:
The patent changes the parameter used for age calculation from conventional methods to include power voltage as a key factor. By calculating age data based on both power voltage and degradation data, the system achieves more accurate reflection of light emitting element age, thereby improving compensation precision and reliability
Solution Approach 2:
The system implements a feedback mechanism where age data is continuously calculated and used to generate compensation data that is fed back to the display device. This closed-loop approach ensures that compensation is based on actual measured degradation, improving both accuracy and reliability of the compensation process
2Reliability
If degradation data is accumulated to compensate for image sticking, then image quality improves, but the grayscale compensation value may become saturated
Solution Approach 1:
The patent introduces a dynamic scaling mechanism that adjusts the grayscale compensation value based on the calculated age data. The scaler dynamically modifies the compensation magnitude to prevent saturation while maintaining effective image sticking compensation, allowing the system to adapt to different degradation levels
Solution Approach 2:
The system applies partial compensation by scaling the grayscale compensation value rather than applying full compensation. This partial action approach prevents over-compensation and saturation while still achieving sufficient image quality improvement, avoiding the harmful effect of grayscale saturation
Data Source
AI summary
A display device includes a pixel emitting light based on input image data, an age data calculator configured to generate age data of a light emitting element included in the pixel in consideration of a power voltage supplied to the pixel, and a compensator configured to output age compensation data by determining a grayscale compensation value corresponding to an input grayscale of the input image data, based on the age data, and applying the grayscale compensation value to the input image data.