Display Panel Driving Method for Color Shift and Brightness Uniformity
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Solution Overview
Problem
Conventional driving methods for display panels cause color shift and abnormal picture quality due to mismatched polarities of high voltage applied to sub-pixels, leading to uneven brightness and affected common electrode voltage, which compromises image accuracy.
Innovation Solution
A driving method that applies drive voltages with opposite polarities to adjacent sub-pixels and utilizes multiple voltage levels to ensure equal numbers of sub-pixels with positive and negative polarities in each column, preventing parasitic capacitance interference and maintaining accurate image signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different drive voltage signals are applied to two adjacent pixel units with opposite polarities, then color shift problem is solved, but mismatch of positive and negative polarities causes uneven brightness and affects picture quality
Solution Approach 1:
The pixel units are divided into first pixel units and second pixel units with different polarity configurations. By segmenting the pixel array into groups with opposite polarities, the patent achieves both color shift correction and brightness uniformity. Each segment (pixel unit) is driven with appropriate polarity to balance the overall display performance.
Solution Approach 2:
Different drive voltage signals with opposite polarities are applied to different regions (first pixel units vs. second pixel units) of the display panel. This local differentiation in voltage polarity allows each region to compensate for color shift while maintaining overall brightness uniformity across the entire panel.
2Quantity of substance
If high voltage with positive polarity is applied to more sub-pixels than negative polarity in the same column, then common electrode voltage Vcom increases due to parasitic capacitance, but this causes unequal charging and brightness differences
Solution Approach 1:
The patent applies drive voltage signals with opposite polarities to first pixel units and second pixel units, creating a counterbalancing effect. The negative polarity signals compensate for the positive polarity signals, preventing the accumulation of parasitic capacitance effects and ensuring that the common electrode voltage Vcom remains stable, thus maintaining uniform brightness across all sub-pixels.
3Reliability
If conventional driving method is used to solve color shift, then color shift is corrected, but picture color and quality are affected due to unequal voltage application
Solution Approach 1:
The patent employs an asymmetric driving scheme where first pixel units and second pixel units are driven with opposite polarities in a non-uniform pattern. This asymmetric approach allows correction of color shift while maintaining picture quality by strategically distributing the polarity differences across different regions of the display panel.
Data Source
AI summary
The present disclosure illustrates a driving method of a display panel and a driver device thereof. The method comprises steps of: applying drive voltages with opposite polarities to drive the positional corresponding sub-pixels of the two adjacent rows of pixel units, wherein the voltages with opposite polarities comprise voltage with positive polarity and voltage with negative polarity; applying voltages with positive polarity to a part of the positional corresponding sub-pixels of the two adjacent rows of pixel units; applying voltage with negative polarity to the other part of the positional corresponding sub-pixels of the two adjacent rows of pixel units; applying two drive voltages with opposite polarities to drive sub-pixels of the same pixel unit; applying drive voltages with at least two voltage levels to drive sub-pixels of the same pixel unit, and separating the plurality of sub-pixels according to the drive voltages with voltage levels.