Display Panel Driving Method Reducing Color Shift
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Solution Overview
Problem
Large viewing angle color shift issues in VA type liquid crystal display panels due to non-linear brightness change with voltage, leading to color deviation, which is partially mitigated by subdividing sub-pixels but at the cost of increased metal traces and manufacturing complexity.
Innovation Solution
A driving method and device for display panels that utilize three columns of subpixels with alternating high and low voltages, where the processor executes instructions for point inversion driving with different preset voltages in alternating frames to reduce color shift, employing a processor and memory to manage the driving of subpixels in a display array with distinct voltage polarities.
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 color shift occurs at large viewing angles
Solution Approach 1:
The pixel is divided into a main pixel and a subpixel, with the subpixel having a different liquid crystal layer structure (first liquid crystal layer with different molecular orientation) to compensate for color shift at large viewing angles while maintaining the VA type display's manufacturing advantages
2Object-affected harmful factors
If subpixels are subdivided into main pixel and subpixel, then color shift is improved, but the number of metal traces and driving devices doubles
Solution Approach 1:
The common electrode is shared between the main pixel and subpixel, and the second electrode is also shared, reducing the number of independent electrode structures. The liquid crystal layer is designed with a first liquid crystal layer and second liquid crystal layer that can be manufactured in a relatively integrated process
Solution Approach 2:
The common electrode serves both the main pixel and subpixel simultaneously, and the second electrode also serves dual purposes. The liquid crystal layers work together to provide both the primary display function and the color shift compensation function
3Object-affected harmful factors
If subpixels are subdivided into main pixel and subpixel, then color shift is improved, but transparent opening area is sacrificed
Solution Approach 1:
The subpixel is positioned at a specific location within the pixel structure, and the liquid crystal layers are arranged with specific local orientations (first liquid crystal layer with vertical orientation, second liquid crystal layer with different orientation) to provide color shift compensation only where needed, rather than requiring the entire pixel structure to be redesigned
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 solution effectively reduces the probability of color shift at large viewing angles by alternately arranging pixel units with high and low voltage intensities and different subpixel polarities, improving display performance without doubling the number of metal traces or increasing costs.
Implementation Method 1
Large size liquid crystal display panels are mostly configured in vertical alignment (VA) type or in coplanar switching (IPS) type
Data Source
AI summary
Disclosed is a driving method and a device of display panel, as well as a display apparatus. Compared with the conventional design, adjacent pixel units in a display array in the application display panel are arranged alternately with high and low voltage intensities, polarities of adjacent subpixels in the display array are different, and common electrodes of subpixels in a same row are provided with two different preset voltages. The driving device drives the subpixels in the display array to perform point inversion driving according to the two different preset voltages in a driving period, which can reduce the probability of the phenomenon of viewing angle color shift of the display panel, and when the display panel operates with this driving period, the problem of viewing angle color shift of the display panel can be improved.