Display Panel Driving Method for Vertical Alignment LCD Color Cast Correction
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Solution Overview
Problem
In vertical alignment liquid crystal display devices, color cast occurs due to varying light transmittance at different viewing angles, and existing solutions either increase metal wires or TFT elements, affecting transmittance and brightness, or lead to abnormal picture quality from mismatched subpixel voltages.
Innovation Solution
A driving method and device that divide pixel units into groups, applying different voltage levels and polarities to subpixels in adjacent rows and columns, ensuring equal numbers of positive and negative polarity subpixels to prevent Vcom interference and maintain accurate image signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two different high and low drive voltage signals are applied to every adjacent two pixel units to improve color cast, then color cast is reduced, but the number of positive and negative polarity subpixels becomes mismatched causing abnormal picture quality
Solution Approach 1:
The display panel is divided into multiple pixel unit groups, where each group contains an even number of pixel units. This segmentation ensures that within each group, the number of positive polarity subpixels equals the number of negative polarity subpixels, thereby balancing stray capacitance effects and preventing abnormal picture quality while maintaining color cast improvement
Solution Approach 2:
Adjacent pixel unit groups use opposite polarity drive voltages (first group uses positive polarity, second group uses negative polarity, and so on). This asymmetric arrangement between groups combined with symmetric arrangement within groups allows color cast correction while maintaining overall electrical balance
2Ease of manufacture
If pixel electrodes are divided into two independent pixel electrodes to improve color cast, then color cast is reduced, but metal wires and TFT elements increase reducing light transmitting aperture
Solution Approach 1:
Instead of changing the physical structure by adding more electrodes and wires, the invention changes the electrical parameter (drive voltage polarity) to achieve color cast improvement. By applying different polarity voltages to adjacent pixel units, color cast is corrected without adding any physical structures that would reduce light transmitting aperture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances picture quality by preventing stray capacitance effects on Vcom, eliminating color cast and abnormal picture issues while maintaining consistent subpixel charging, thus improving display accuracy and brightness.
Implementation Method 1
since liquid crystal molecules keep a certain deflection angle, the transmittance of light under different viewing angles is different
Implementation Method 2
due to the influence of stray capacitance, when the number of the subpixels of positive polarity high voltage is more than the number of the subpixels of negative polarity high voltage in the same row, the equivalent voltage of a common voltage Vcom is improved to some extent relative to the original Vcom
Data Source
AI summary
The disclosure relates to a driving method and a driving device for a display panel and a display device, wherein the display panel includes a plurality of first pixel units and a plurality of second pixel units which are disposed adjacently. The driving method includes dividing a plurality of pixel units of the display panel into a plurality of pixel unit groups; driving subpixels in first pixel units and subpixels in second pixel units by using drive voltages of different voltage levels; driving the subpixels arranged in the same line in every two adjacent pixel unit groups by using the drive voltages of opposite polarities; and driving every continuously arranged four lines of pixel units in the same one of the pixel unit groups by using the drive voltages of different polarities.