Array Substrate Slit Geometry for Liquid Crystal Restoring Force
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Solution Overview
Problem
Liquid crystal display devices of the FFS mode suffer from trace mura due to poor restoring force of the liquid crystal molecule layer, caused by different deflection states of liquid crystal molecules between the middle and edge areas of sub-pixels, leading to image sticking phenomena.
Innovation Solution
The array substrate design includes a common electrode with first and second sub-common electrodes, where the second sub-common electrodes are connected between adjacent first sub-common electrodes and feature slits at an angle, enhancing the restoring force of liquid crystal molecules and minimizing area occupation to maintain high light transmittance and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a common electrode is used in FFS mode liquid crystal display devices, then the display achieves wide viewing angle and high transmission efficiency, but trace mura occurs due to poor restoring force of liquid crystal molecules
Solution Approach 1:
The common electrode is divided into multiple independent common electrode sections arranged in an array, with each section corresponding to a sub-pixel region. This segmentation allows independent control of electric fields in different areas, enabling the edge areas to receive enhanced electric field strength for improved liquid crystal molecule restoring force while maintaining high light transmittance in the center areas.
Solution Approach 2:
Different regions of the common electrode are designed with different properties: edge area common electrode sections have structures optimized for generating strong electric fields to improve restoring force, while center area sections maintain structures optimized for high light transmittance. This local differentiation resolves the contradiction between these two requirements.
2Reliability
If the common electrode structure is modified to improve restoring force, then trace mura is prevented, but the aperture ratio and light transmittance may be reduced
Solution Approach 1:
By segmenting the common electrode into multiple sections, the structure can apply restoring force enhancement only where needed (edge areas) without occupying excessive area. The segmented design allows precise placement of electric field enhancement structures, minimizing their impact on the overall aperture ratio while effectively preventing trace mura.
3Reliability
If slits are added to common electrode sections to improve liquid crystal molecule deflection, then restoring force is enhanced, but the device complexity increases
Solution Approach 1:
The segmentation approach allows slits to be added only to specific common electrode sections (particularly edge area sections) rather than uniformly across the entire common electrode. This selective application reduces the overall complexity increase while achieving the desired improvement in liquid crystal molecule deflection and restoring force.
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 effectively prevents trace mura by improving the deflection state of liquid crystal molecules and enhancing the aperture ratio and light transmittance of the liquid crystal display device.
Implementation Method 1
a common electrode located over the plurality of sub-pixels and comprising a plurality of first sub-common electrodes and a plurality of second sub-common electrodes
Data Source
AI summary
An array substrate and a display device including the array substrate are disclosed. The array substrate includes: gate lines and data lines, gate lines and data lines defining sub-pixels arranged in an array, each of the sub-pixels being provided with a pixel electrode; and a common electrode located over the sub-pixels and including first sub-common electrodes and second sub-common electrodes in one-to-one correspondence with the sub-pixels. Each second sub-common electrode is connected between two adjacent first sub-common electrodes, each of the first sub-common electrodes is provided with first slits therein, the second sub-common electrode distributed in an extension direction of the first slits is provided with second slits therein, and there is an angle between an extension direction of the second slits and the extension direction of the first slits.