Display Panel Polarity Switching Flicker Compensation
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Solution Overview
Problem
Conventional TFT-LCD display panels experience an instantaneous flicker problem when switching polarity due to sub-pixels with the same polarity appearing brighter than those with different polarities, especially at low gray levels.
Innovation Solution
A driving method for a display panel that detects a preset switching condition based on the number of sub-pixels with the same gray level, switches polarity modes, and uses data compensation values obtained through bilinear interpolation to adjust sub-pixel values, avoiding flicker by superimposing compensation values under the second polarity mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity switching is performed to solve h-block problem, then h-block problem is resolved, but instantaneous flicker occurs due to brightness difference between sub-pixels with same and different polarities
Solution Approach 1:
The patent changes the gray level parameter of sub-pixels based on their polarity relationship. Sub-pixels with the same polarity as the current frame's reference polarity have their gray levels adjusted (increased or decreased based on a compensation value), while sub-pixels with different polarity remain unchanged. This parameter change compensates for the brightness difference caused by polarity switching, thereby resolving the instantaneous flicker problem while maintaining h-block problem resolution
Solution Approach 2:
The patent performs preliminary determination of the reference polarity for each frame in advance. By determining which polarity (positive or negative) will be the reference polarity before generating the display data, the system can proactively apply the appropriate gray level compensation to sub-pixels. This preliminary action ensures that brightness compensation is already in place before polarity switching occurs, preventing instantaneous flicker
Data Source
AI summary
A driving method for a display panel and a driving device are disclosed. The method includes: detecting that if a current data frame satisfies a preset switching condition of switching a first polarity mode to a second polarity mode; if the current data frame satisfies a preset switching condition, obtaining a polarity input signal corresponding to a previous data frame; obtaining a data compensation value corresponding to each sub-pixel according to the polarity input signal and a position of each sub-pixel of the current data frame; under the second polarity mode, after superimposing a value of each sub-pixel of the current data frame and the data compensation value corresponding to each sub-pixel, outputting to a display panel. Accordingly, the present invention can avoid an instantaneous flicker when switching from the first polarity mode to the second polarity mode.