Sub-pixel Voltage Compensation for Residual Image in Displays
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Solution Overview
Problem
Traditional liquid crystal displays suffer from residual image and flicker uniformity issues due to charge accumulation and polarity deviations in the driving voltage, which are difficult to address through existing material and signal optimization methods.
Innovation Solution
A system and method for image processing that includes a greyscale value selection module, optimal common voltage determination, flicker uniformity determination, and image compensation to improve residual image and flicker uniformity by selecting optimal greyscale values and common voltages for sub-pixels, and compensating them based on determined uniformity and flicker values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If driving signal voltage polarity is adjusted to improve residual image, then residual image is reduced, but the process becomes complex and difficult to accurately set compensation amount
Solution Approach 1:
The patent changes the parameter being adjusted from driving signal voltage polarity to common electrode voltage. By varying the common voltage parameter across different display regions, the system achieves residual image compensation without the complexity of polarity switching. Each region's common voltage is independently optimized to counteract charge accumulation effects.
Solution Approach 2:
The patent extracts the compensation function from the driving signal path and places it in the common electrode voltage control path. This separation allows the compensation mechanism to operate independently from the image display signals, simplifying the overall control architecture while maintaining effectiveness.
2Object-affected harmful factors
If driving signal voltage polarity is adjusted to improve residual image, then residual image is reduced, but different display areas require different polarities making uniform compensation difficult
Solution Approach 1:
The patent implements local quality by assigning different common voltage values to different display regions based on their specific charge accumulation characteristics. Each region's common voltage is independently optimized, allowing tailored compensation for local variations in residual image and flicker uniformity without affecting other regions.
3Object-affected harmful factors
If image is dynamically refreshed to improve residual image, then static residual image is reduced, but display effect of the panel is affected
Solution Approach 1:
The patent segments the voltage control into two independent components: common electrode voltage for residual image compensation and pixel electrode voltage for image display. This segmentation allows the common voltage to be optimized for reducing residual images while the pixel voltage maintains optimal image quality, preventing the trade-off present in dynamic refreshing approaches.
Data Source
AI summary
Exemplary embodiments of the present disclosure relate to a system and method for image processing, and a display device. The system comprises: a greyscale value selection module for selecting a plurality of color greyscale values for each sub-pixel, the sub-pixel being used for displaying an image; an optimal common voltage determination module for determining an optimal common voltage of each sub-pixel according to the selected color greyscale values for each sub-pixel; a uniformity determination module comprising a flicker uniformity determination module and a common voltage uniformity determination module, the flicker uniformity determination module being used for determining the flicker uniformity of each sub-pixel, the common voltage uniformity determination module being used for determining the common voltage uniformity of each sub-pixel according to the determined flicker uniformity of each sub-pixel; and an image compensation module for compensating each sub-pixel according to at least one of the optimal common voltage of each sub-pixel and the common voltage uniformity of each sub-pixel, thereby improving the residual image and flicker uniformity at the time of image display.