Display Panel Grayscale Driving for Bright-Line Afterimage Reduction
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Solution Overview
Problem
Display panels experience bright-line afterimages due to differences in charging and discharging times of sub-pixels with positive and negative polarities during column inversion driving, particularly when transitioning from high-contrast images to low-contrast images.
Innovation Solution
A method for driving a display panel that involves determining target grayscale values for sub-pixels based on original and previous grayscale values, using lookup tables to adjust grayscale differences, and applying data voltages accordingly to minimize afterimage formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If column inversion driving mode is used to drive the display panel, then the driving efficiency is improved, but bright-line afterimages occur due to differences in charging and discharging times of sub-pixels with positive and negative polarities
Solution Approach 1:
The patent adjusts the grayscale values of sub-pixels dynamically based on their polarity and the grayscale value of previous frame sub-pixels in the same column. By changing the grayscale parameters adaptively, the charging and discharging times are balanced, eliminating bright-line afterimages while maintaining column inversion driving efficiency
Solution Approach 2:
The patent uses the grayscale value of sub-pixels from the previous frame as feedback to adjust the current frame grayscale values. This feedback mechanism allows the system to compensate for polarity-related charging differences, preventing afterimage formation while maintaining high driving efficiency
2Manufacturing precision
If grayscale values are adjusted to reduce afterimages, then image transition quality is improved, but the complexity of the driving method increases
Solution Approach 1:
The patent divides the display panel into sub-pixel groups based on polarity (positive and negative groups) and processes each group separately. By segmenting the grayscale adjustment by polarity and column, the complex global optimization problem is broken down into simpler, manageable segments that can be processed independently
Solution Approach 2:
The patent applies different grayscale adjustment strategies to different sub-pixel groups based on their local characteristics (polarity and column position). Each sub-pixel's grayscale value is adjusted according to its specific polarity group and column, rather than applying a uniform adjustment across the entire display, thereby improving image quality without excessive complexity
Data Source
AI summary
A method for driving a display panel and a display device, the method includes: acquiring an original grayscale value of each sub-pixel in an mth row and a target grayscale value corresponding to a data voltage input to each sub-pixel in an (m−1)th row m being an integer greater than 1; if, in a same column, the original grayscale value of the sub-pixel in the mth row is larger than the target grayscale value corresponding to the data voltage input to the sub-pixel in the (m−1)th row, determining a target grayscale value of each sub-pixel in the mth row according to the original grayscale value of the sub-pixel in the mth row and the target grayscale value of the sub-pixel in the (m−1)th row inputting a data voltage to a data line in the display panel according to the target grayscale value of each sub-pixel in the mth row.