Display Panel Subpixel Polarity Balancing for Wide-Angle Color Shift
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Solution Overview
Problem
Large-sized liquid crystal displays using the vertical alignment (VA) mode suffer from color shift at wide angles due to mismatched numbers of high voltage subpixels with positive and negative polarities, leading to incorrect colors and degraded image quality.
Innovation Solution
A display panel with a substrate and subpixel array, where data lines input alternating high and low voltage signals, ensuring equal numbers of subpixels with positive and negative polarities for each color, and a driving method to adjust voltage signals based on a display search chart to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If data signals are divided into high voltage and low voltage signals for large-sized liquid crystal displays, then color shift at wide angles can be solved, but the number of subpixels with positive and negative polarities becomes mismatched, causing common electrode voltage shift and incorrect colors
Solution Approach 1:
The patent applies local quality by differentiating the treatment of subpixels based on their polarity. Subpixels with positive polarity and negative polarity are assigned different voltage signals (first voltage data signal vs. second voltage data signal) to compensate for the common electrode voltage shift. This localized differentiation ensures that each group of subpixels receives appropriate voltage compensation, maintaining color accuracy while solving the wide-angle color shift problem.
Solution Approach 2:
The patent changes the voltage parameter applied to subpixels based on their polarity. By introducing two distinct voltage data signals with different voltage levels, the system dynamically adjusts the electrical parameters to compensate for the common electrode voltage shift caused by stray capacitance, thereby resolving the color accuracy issue while maintaining wide-angle viewing performance.
2Object-affected harmful factors
If high voltage and low voltage signals are used to improve wide-angle viewing, then color shift is reduced, but image quality degrades due to unbalanced electric charges in subpixels
Solution Approach 1:
The patent implements local quality by applying different voltage signals to subpixels based on their polarity groups. Subpixels with positive polarity receive one voltage signal while subpixels with negative polarity receive another voltage signal. This localized differentiation ensures that the electric charge distribution is balanced across all subpixels, preventing image quality degradation while maintaining the wide-angle viewing improvement.
Solution Approach 2:
The patent employs a feedback mechanism where the display device measures the actual color output and compares it with the expected color values. Based on this feedback, the system adjusts the voltage signals applied to subpixels to compensate for any imbalances, ensuring that image quality is maintained while achieving wide-angle viewing performance.
Data Source
AI summary
A display panel, a display device and a driving method are provided. In the display panel, subpixels input with a first voltage data signal and subpixels input with a second voltage data signal are alternately arranged, and among the subpixels with a same color in a same row, the number of the subpixels input with the first voltage data signal with a positive polarity is equal to the number of the subpixels input with the first voltage data signal with a negative polarity; polarities of data signals of the subpixels in a same column are identical.