Pixel Grayscale Compensation for Display Afterimage Prevention
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Solution Overview
Problem
Existing display devices suffer from pixel deterioration leading to image sticking and afterimages, with current compensation methods applying uniform compensation across all grayscale levels, which can result in visible afterimages at certain levels.
Innovation Solution
A display device that calculates a grayscale compensation value based on the accumulated deterioration index and grayscale value of input image data, adjusting compensation values individually for each pixel and grayscale level, and correcting these values based on driving frequency and image display periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform compensation is applied across all grayscale levels, then the compensation process is simple, but visible afterimages occur at certain grayscale levels
Solution Approach 1:
The patent divides the grayscale range into multiple segments (first grayscale range and second grayscale range) with different compensation methods. For the first range (lower grayscale), uniform compensation is applied, while for the second range (higher grayscale), differentiated compensation based on pixel type (emission vs. non-emission pixels) is applied, thereby preventing visible afterimages while maintaining reasonable process complexity
Solution Approach 2:
The patent applies different compensation strategies to different local regions of the grayscale spectrum. Specifically, emission pixels and non-emission pixels are treated differently in the second grayscale range, with non-emission pixels receiving greater compensation. This local differentiation ensures that each grayscale level receives appropriate compensation tailored to its specific characteristics, eliminating the uniform approach's afterimage problem
2Reliability
If grayscale compensation values are adjusted individually for each pixel and grayscale level, then afterimage prevention is improved, but calculation complexity increases
Solution Approach 1:
The patent segments the grayscale levels into two distinct ranges and applies different compensation algorithms to each. This segmentation allows the system to use simple uniform compensation for the majority of grayscale levels (first range) while applying more sophisticated differentiated compensation only where necessary (second range), thereby reducing overall calculation complexity while maintaining effectiveness
Solution Approach 2:
The patent changes the compensation parameter strategy based on the grayscale level parameter. By switching from uniform compensation parameters in the first grayscale range to differentiated compensation parameters in the second grayscale range, the system optimizes the balance between calculation complexity and afterimage prevention effectiveness across different operating conditions
3Productivity
If compensation is applied without considering driving frequency, then the compensation process is faster, but compensation accuracy decreases
Solution Approach 1:
The patent introduces dynamic adaptation by making the deterioration index correction factor dependent on the driving frequency of the display device. The system automatically adjusts the correction factor based on the actual operating frequency, allowing accurate compensation across different driving conditions without requiring separate compensation processes for each frequency, thus maintaining both speed and accuracy
Data Source
AI summary
A display device includes: a display panel having a plurality of pixels in a display area; a scan driver driving gate lines of the display area; a data driver driving data lines in the display area; a timing controller sorting input image data to match a resolution of the display area and controlling driving timing of the scan driver and the data driver; and a deterioration compensator analyzing a deterioration index through the sorted image data, and generating deterioration-compensated image data based on the deterioration index data containing the deterioration index and an input grayscale level of the sorted image data, to provide it to the data driver, wherein the deterioration compensator compensates and modulates the deterioration indices of the deterioration index data depending on a driving frequency of the display panel, and generates the deterioration-compensated image data using the deterioration index data containing the compensated and modulated deterioration index.