VA Display Panel Driving Method for Color Shift Reduction
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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 with alternating rows of first and second pixels, using high and low voltage drive signals in specific polarity arrangements to maintain brightness linearity across viewing angles without extra metal wires or increased costs.
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 pixel is divided into multiple sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel, fourth sub-pixel) with different drive voltages. Each sub-pixel is driven independently with optimized voltage levels to compensate for viewing angle effects, thereby reducing color shift while maintaining the VA technology's manufacturing advantages
2Manufacturing precision
If main pixel and secondary pixel are driven with different voltages to reduce color shift, then gray scale accuracy is improved, but additional metal wires and drive parts are required increasing cost
Solution Approach 1:
Multiple sub-pixels are merged to form a single functional pixel unit. The sub-pixels share common drive circuitry and electrode structures, achieving differentiated voltage control through signal processing rather than through separate physical drive circuits for each sub-pixel
3Object-affected harmful factors
If additional drive circuits are provided for secondary pixel, then color shift is reduced, but light transmitting aperture region is sacrificed
Solution Approach 1:
The drive circuitry is designed to serve multiple sub-pixels simultaneously. The same physical electrodes and control circuits are used to drive multiple sub-pixels with different voltage levels through time-multiplexed or spatial-multiplexed signaling, eliminating the need for separate dedicated circuits for each sub-pixel
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
The method effectively reduces color shift at large viewing angles by averaging pixel brightness, maintaining image quality without additional metal wires or increased costs, ensuring balanced polarity drives for accurate image representation.
Implementation Method 1
VA type liquid crystal technology
Implementation Method 2
the brightness of the pixel is fast saturated along with the voltage and then slowly changed due to the limitation of a principle of the VA type liquid crystal technology
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 four columns of pixels as a repeater, adopting a first polarity arrangement drive for former two columns of adjacent pixels, 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.