Array Substrate with Three Sub-Pixel Electrodes for VA LCD Color Shift
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Solution Overview
Problem
Vertical alignment (VA) mode LCDs suffer from a color shift phenomenon at large viewing angles due to differences in light transmission rates between sub-pixels, affecting display quality.
Innovation Solution
The array substrate design includes three sub-pixel electrodes connected to separate switching elements, allowing for voltage rebalancing between sub-pixels by discharging liquid crystal capacitance from one sub-pixel to another, thereby controlling voltage differences and minimizing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If one pixel of the VA panel is divided into two sub-pixels with different gray levels, then the light transmission rate difference between areas is improved, but the color shift phenomenon appears at large viewing angles
Solution Approach 1:
The pixel is divided into three sub-pixel electrodes (first, second, and third sub-pixel electrodes) with different areas, allowing independent control of light transmission in different regions. This segmentation enables precise adjustment of gray levels to compensate for viewing angle effects and eliminate color shift.
Solution Approach 2:
Different sub-pixel electrodes are assigned different areas and connected to different gate lines (first gate line and second gate line), enabling localized control of light transmission rates. The first sub-pixel electrode has a larger area than the second or third sub-pixel electrodes, allowing differential voltage application to maintain consistent color perception across viewing angles.
2Object-affected harmful factors
If three sub-pixel electrodes with different areas are used, then color shift is reduced, but the device complexity increases
Solution Approach 1:
The three sub-pixel electrodes share common connections to the data line and common electrode, while being controlled by two gate lines. This multi-functional design allows a single pixel structure to achieve both normal display function and color shift compensation without requiring completely separate control circuits for each sub-pixel.
Solution Approach 2:
The second and third sub-pixel electrodes are both connected to the data line and can be controlled by either the first or second gate line. This merging of control paths reduces the number of independent control lines needed, simplifying the overall device complexity while maintaining the ability to differentiate sub-pixel light transmission.
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 design improves display quality by reducing color shift at large viewing angles by generating voltage differences between sub-pixels, ensuring consistent light transmission rates.
Implementation Method 1
The LCD generates an electric field by applying a voltage to pixel electrode and common electrode on the two substrates
Implementation Method 2
the electric field controls liquid crystal molecules to deflect and combine the polarization of the incident light
Implementation Method 3
the electric field controls liquid crystal molecules to deflect
Data Source
AI summary
The present invention discloses an array substrate and a liquid crystal display panel. Each pixel region is connected correspondingly to a data line and two gate line, and each pixel region comprises three sub-pixel electrodes and three switching elements, wherein the first switching element is connected to the first gate line, the first sub-pixel electrode, and the data line, the second switching element is connected to the first gate line, the second sub-pixel electrode and the data line, and the third switching element is connected to the second gate line, a second sub-pixel electrode, and a third sub-pixel electrode. By the above-mentioned technical solution, the present invention can improve the color shift phenomenon when in a large viewing angle and increase the display quality.