Display Panel Driving Method for Large Viewing Angle Color Shift
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Solution Overview
Problem
Large viewing angle color shift in VA type liquid crystal display panels due to rapid brightness saturation with voltage, leading to deviations in gray scale representation and increased manufacturing costs with traditional solutions.
Innovation Solution
A driving method and device for display panels that utilize a time duration of scanning at least three adjacent columns of pixel units, driving common electrodes with preset voltages and data signals to achieve a high and low voltage crossover arrangement without doubling metal wiring and driving devices, thereby improving color shift without increasing cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional VA type liquid crystal technology is used to achieve high production efficiency and low manufacturing cost, then production efficiency and manufacturing cost are improved, but large viewing angle color shift occurs due to brightness saturation
Solution Approach 1:
The pixel is divided into a main pixel and a subpixel, with the subpixel having a smaller area. The subpixel is further divided into multiple sub-regions (first sub-region, second sub-region, third sub-region) that can be independently controlled with different voltages. This segmentation allows different parts of the pixel to contribute differently to the overall brightness, improving wide-viewing angle color performance without requiring complete redesign of the liquid crystal material or structure.
Solution Approach 2:
Different voltage values are applied to different sub-regions of the subpixel (first voltage to first sub-region, second voltage to second sub-region, third voltage to third sub-region). This creates local quality variations within the pixel structure, allowing precise control over the brightness contribution from each region. The main pixel and subpixel together form a composite pixel with optimized luminance characteristics across different viewing angles.
2Object-affected harmful factors
If subpixels are subdivided into main pixel and subpixel with different driving voltages to improve color shift, then color shift is improved, but the number of metal traces and driving devices must be doubled
Solution Approach 1:
The subpixel is divided into multiple sub-regions that can share common electrode structures and driving circuits. By merging the control of multiple sub-regions under a unified subpixel structure, the patent reduces the need for completely separate metal traces and driving devices for each sub-region. The main pixel and subpixel share portions of the pixel electrode structure, reducing overall metal trace requirements.
Solution Approach 2:
The subpixel structure serves multiple functions: it provides additional brightness control, enables wide-viewing angle color correction, and can be integrated with existing pixel structures. The same subpixel structure can be used across different pixel types (red, green, blue) in the display panel, reducing the need for specialized structures for each color channel.
3Object-affected harmful factors
If subpixels are subdivided into main pixel and subpixel to improve color shift, then color shift is improved, but transparent opening area is sacrificed and light transmittance is affected
Solution Approach 1:
The subpixel occupying a portion of the pixel area is configured with specific optical properties (different refractive index or alignment) to optimize its light transmission characteristics. This local optimization allows the subpixel to contribute to color correction while maintaining or enhancing overall light transmittance. The smaller area of the subpixel compared to the full pixel ensures that the transparent opening area is not significantly reduced.
4Measurement precision
If brightness changes linearly with voltage to accurately represent gray scale, then gray scale representation is improved, but this ideal situation cannot be achieved at large viewing angles due to brightness saturation
Solution Approach 1:
The pixel is divided into a main pixel and a subpixel with different area ratios. The subpixel is further segmented into multiple sub-regions that can be independently controlled. By adjusting the voltage applied to each sub-region and the subpixel, the patent creates a composite luminance response that maintains a more linear relationship between driving voltage and perceived brightness across different viewing angles, correcting the saturation effect.
Solution Approach 2:
The patent changes the voltage parameters applied to different pixel components (main pixel voltage, subpixel voltage, and sub-region voltages) to optimize the overall luminance response. By carefully selecting and adjusting these voltage parameters, the composite pixel achieves improved gray scale representation and reduced brightness saturation at large viewing angles while maintaining the desired brightness-voltage relationship.
Data Source
AI summary
Disclosed a driving method and a device of display panel, as well as a display panel, taking a time duration of scanning at least three adjacent columns of pixel unit as a driving period, the common electrodes of even rows of sub-pixels and odd rows of sub-pixels in adjacent rows of pixel units are driven by a preset voltage in the current driving period, and when the first preset voltage and the second preset voltage meet preset conditions, the preset sub-pixels in the pixel units are driven according to a preset data driving signal input by a data driving circuit.