Curved Slit Common Electrode for LCD Color Shifting
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices suffer from 'color shifting' due to anisotropic refraction index of liquid crystal molecules, leading to display differences at various viewing angles and reduced aperture and contrast ratios, especially in edge regions of pixel units.
Innovation Solution
The array substrate design features a common electrode with curved slits parallel to each other and a pixel electrode pattern profile matching the slit region, ensuring uniform electrical field distribution across pixel units, which reduces display differences and increases aperture and contrast ratios by compensating for 'color shifting'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional FFS type pixel configuration is used, then liquid crystal molecules can be rotated to control transmittance, but color shifting occurs at different viewing angles due to anisotropic refraction index
Solution Approach 1:
The common electrode is divided into multiple slits that are parallel to the data line, creating multiple independent electric field regions. This segmentation allows different areas of the pixel to have optimized electric field distributions, reducing color shifting while maintaining transmittance control.
Solution Approach 2:
The slit configuration in the common electrode creates an asymmetric electric field distribution that compensates for the anisotropic refraction index of liquid crystal molecules. The slits are positioned and dimensioned to balance the electric field across different viewing angles, reducing color shifting.
2Object-affected harmful factors
If curved slits are used in common electrode to reduce color shifting, then display consistency improves, but manufacturing complexity increases
Solution Approach 1:
The common electrode slits are designed with curved profiles rather than straight lines. This curvature allows the electric field to be more uniformly distributed across the pixel area, improving display consistency and reducing edge effects while maintaining manufacturability through standard photolithography processes.
3Manufacturing precision
If pixel electrode pattern profile is made parallel to slit region profile, then electrical field distribution becomes uniform, but device complexity increases
Solution Approach 1:
The pixel electrode pattern profile is specifically designed to be parallel to the slit region profile of the common electrode in the edge regions of the pixel. This local optimization ensures uniform electrical field distribution where it is most needed (at the edges), while the overall device structure remains relatively simple and manufacturable.
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 configuration enhances the display consistency and quality by uniformly rotating liquid crystal molecules, reducing 'color shifting' and improving the overall displaying properties of LCD devices.
Implementation Method 1
The liquid crystal molecules can be rotated by driving of the potential difference produced between the pixel electrode 11 and the common electrode 13
Implementation Method 2
the refraction index of the liquid crystal molecules is anisotropic, the liquid crystal display device is in different displaying states at different viewing angles
Implementation Method 3
the electrical field on both sides of the boundary line at the curved portion is symmetrical about the boundary line during the driving process and the crystal liquid molecules 20 are rotated in two directions opposite to each other
Data Source
AI summary
Disclosed are an array substrate and a liquid crystal display device. The array substrate comprises a base substrate, and data lines and gate lines, which are orthogonal to each other to define a plurality of pixel units, formed in a pixel region of the base substrate, with each of the pixel units comprising a switching element, a pixel electrode and a common electrode that is overlapped with the pixel electrode. The common electrode in each of the pixel units comprises slits, and the slits have a shape of curved line and are parallel to each other so as to form a slit region in the common electrode; and the pattern profile of the pixel electrode is parallel to the profile of the slit region of the common electrode.