Display Device Subpixel Luminance Compensation for Afterimage Reduction
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Solution Overview
Problem
Display devices such as LED, QDD, and LCD suffer from image quality degradation and reduced lifespan due to afterimage formation caused by luminance deterioration, which existing technologies fail to effectively address.
Innovation Solution
A display device and driving method that utilize a timing controller to calculate average luminance for each subpixel, determine afterimage influence, and apply compensation gains to reduce afterimage formation by adjusting luminance, thereby improving image quality and extending device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display devices operate continuously with high luminance, then display brightness and visibility are improved, but afterimage formation and luminance deterioration occur, reducing display quality and device lifespan
Solution Approach 1:
The timing controller calculates average luminance for each subpixel and determines afterimage influence in advance before image display. Compensation gains are pre-calculated based on the relationship between average luminance and afterimage influence, allowing the system to proactively adjust luminance to prevent afterimage formation rather than reacting after deterioration occurs
Solution Approach 2:
The system dynamically changes the luminance parameter of subpixels based on calculated afterimage influence. By adjusting compensation gains according to average luminance levels, the system modifies display luminance in real-time to maintain optimal display quality and prevent cumulative deterioration, thus resolving the contradiction between maintaining high brightness and ensuring long-term reliability
2Manufacturing precision
If compensation for afterimage is applied to each subpixel individually, then display quality is improved, but processing complexity and computational load increase
Solution Approach 1:
The display panel is divided into multiple subpixels (red, green, blue) with each subpixel having its own average luminance calculation and compensation gain application. The timing controller processes each subpixel channel separately, calculating average luminance and determining compensation gains for each color channel, which allows precise control of afterimage for each subpixel while maintaining manageable processing through systematic segmentation
Solution Approach 2:
The timing controller performs multiple functions: it calculates average luminance, determines afterimage influence, calculates compensation gains, and applies corrections to each subpixel. This multi-functional approach consolidates what could be separate complex systems into a single controller, reducing overall device complexity while maintaining high display quality through comprehensive subpixel-level compensation
Data Source
AI summary
A display device includes a timing controller for calculating an average luminance for each subpixel with respect to an input image, calculating afterimage influence for each subpixel for determining a possibility of causing afterimage for each subpixel position on the basis of the average luminance, and deriving a compensation gain for each subpixel on the basis of the afterimage influence for each subpixel to provide the input image as a compensated image, a data driver for outputting a data voltage on the basis of the compensated image output from the timing controller, and a display panel for displaying an image on the basis of the data voltage.