VA Display Driving Method for Large-Angle Color Shift
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Solution Overview
Problem
Large-viewing angle color shift in VA-type liquid crystal display panels due to non-linear brightness change with voltage, leading to deviated gray scales and increased manufacturing costs from additional metal wires and drive parts.
Innovation Solution
A driving method for display panels that alternates rows of pixels with different drive voltages, using high and low voltage signals in specific polarity arrangements to maintain brightness linearity across viewing angles without additional metal wires or increased costs, ensuring balanced sub-pixel polarity and Vcom levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If VA type liquid crystal technology is used, then production efficiency and manufacturing cost are improved, but optical property defects such as color shift at large viewing angles occur
Solution Approach 1:
The patent applies parameter changes by alternating drive voltages between adjacent pixels and using different polarity arrangements for different rows of pixels. This modifies the electrical parameters dynamically to compensate for the optical defects of VA type liquid crystal at large viewing angles, reducing color shift while maintaining the manufacturing advantages of VA technology
2Measurement precision
If drive voltage is increased to improve brightness linearity, then gray scale accuracy is improved, but color shift at large viewing angles worsens due to non-linear brightness change
Solution Approach 1:
The patent implements dynamics by dynamically adjusting drive voltages for different pixels based on their position and using alternating polarity arrangements. This dynamic voltage adjustment compensates for the non-linear brightness characteristics of VA liquid crystal at large viewing angles, maintaining gray scale accuracy while reducing color shift
Solution Approach 2:
The patent changes electrical parameters by applying different voltage levels and polarity sequences to different pixel rows. This parameter modulation compensates for the non-linear optical response of VA liquid crystal, improving gray scale representation while mitigating color shift effects
3Object-affected harmful factors
If secondary pixels with low drive voltage are added to reduce color shift, then color shift is reduced, but device complexity and manufacturing cost increase due to additional metal wires and drive parts
Solution Approach 1:
The patent merges the functions of main pixels and secondary pixels into a single pixel structure. By using alternating drive voltages and polarity arrangements on existing pixels, it achieves the color shift reduction effect of having separate main and secondary pixels without the need for additional metal wires or drive circuitry
Solution Approach 2:
The patent makes existing pixels multi-functional by enabling them to operate in different modes (main pixel mode and secondary pixel mode) through alternating voltage drive. This allows a single pixel structure to perform both functions, eliminating the need for separate secondary pixel structures and associated metal wires
4Object-affected harmful factors
If secondary pixels with low drive voltage are added to reduce color shift, then color shift is reduced, but light transmitting aperture region is reduced
Solution Approach 1:
The patent combines the optical functions of main and secondary pixels within the same physical pixel area. By using alternating voltage drive on existing pixels rather than adding separate secondary pixel structures, it maintains the full light transmitting aperture while achieving color shift reduction
Data Source
AI summary
A driving method for a display panel and a display device are provided. The driving method includes adopting drive data of relatively high voltage and drive data of relatively low voltage respectively for driving any two adjacent pixels; and with three columns of pixels as a repeater, adopting a first polarity arrangement drive for pixels in a first column, and adopting a second polarity arrangement drive for the rest two columns of adjacent pixels; the first polarity arrangement drive is to perform positive polarity drive, negative polarity drive, negative polarity drive and positive polarity drive on four sub-pixels in the pixel respectively; and the second polarity arrangement drive is to perform negative polarity drive, positive polarity drive, positive polarity drive and negative polarity drive on four sub-pixels in the pixel respectively. The display device uses such a driving method.