Bent Strip Electrode and Segmented Second Layer for LCD Disclination Control
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Solution Overview
Problem
Current display devices, such as LCDs and OLEDs, suffer from poor display quality due to disclinations caused by disordered liquid crystal molecule alignments under external pressure, leading to scratches and luminance differences between pressed and unpressed regions.
Innovation Solution
A TFT array substrate design featuring a strip-like first electrode with bent portions and a sheet-like second electrode layer with openings below the bent portions, reducing the overlapping area and electric field influence, thereby minimizing disclinations and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional TFT array substrate with straight strip-like electrodes and continuous second electrode layer is used, then the manufacturing process is simple, but disclinations occur due to disordered liquid crystal molecule alignments under external pressure, resulting in poor display quality
Solution Approach 1:
The second electrode layer is segmented by introducing openings (through-holes or recesses) at specific positions below the bent portions of strip-like electrodes. This segmentation reduces the overlapping area between electrodes, thereby reducing electric field concentration and preventing disclinations in the liquid crystal layer, which improves display quality without excessive complexity increase
Solution Approach 2:
The strip-like first electrodes are designed with bent portions (curved shapes) instead of straight lines. These bent portions, combined with openings in the second electrode layer, create a specific electric field distribution that reduces stress concentration on liquid crystal molecules under external pressure, preventing disclination formation and improving display reliability
2Ease of operation
If the overlapping area between strip-like first electrode and second electrode layer is large, then the electric field is strong for liquid crystal control, but disclinations occur under external pressure causing scratches and luminance differences
Solution Approach 1:
The electrode structure is designed with non-uniform characteristics: the second electrode layer has openings specifically at positions below bent portions of strip-like electrodes, creating local variations in overlapping area. This local quality adjustment reduces electric field concentration at critical positions where disclinations tend to form, while maintaining sufficient control efficiency in other regions
Solution Approach 2:
The bent portions of strip-like electrodes, which could potentially create stress concentration points, are combined with openings in the second electrode layer to convert the potential harmful electric field concentration into a beneficial distributed electric field pattern. This configuration reduces disclination formation while maintaining effective liquid crystal control
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 design enhances substrate yield and display quality by reducing electric field effects on liquid crystal alignment, minimizing disclinations and maintaining alignment after external pressure is removed.
Implementation Method 1
the first electrode layer includes a strip-like first electrode, and the second electrode layer is a sheet-like electrode, the strip-like first electrode includes a bent portion, and the second electrode layer includes at least an opening, the opening is located below the bent portion
Data Source
AI summary
A TFT array substrate includes a first electrode layer and a second electrode layer disposed below the first electrode layer. The first electrode layer includes a strip-like first electrode, and the second electrode layer is a sheet-like electrode. The strip-like first electrode includes a bent portion. The second electrode layer includes at least one opening, the opening is located below the bent portion.