Asymmetric Pixel Electrode Branches for Display Transmittance
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Solution Overview
Problem
Conventional polymer-stabilized alignment (PSA) display panels face issues with disclination lines around pixel electrodes, reducing contrast ratio and transmittance, and the lithographic process limits the reduction of the width of the black matrix between pixel electrodes, hindering further improvements in transmittance.
Innovation Solution
A pixel structure with asymmetrically arranged branch portions on both sides of the data line, reducing the width of the data line and minimizing disclination lines, thereby enhancing transmittance and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black matrix width is reduced to improve transmittance, then the transmittance increases, but the lithographic process limit prevents further reduction below 8 micrometers
Solution Approach 1:
The pixel electrode is designed with asymmetric branch portions that are non-symmetrically arranged relative to the data line. This asymmetric configuration allows the data line to be positioned more centrally within the pixel structure, reducing the required spacing and enabling narrower data line widths that overcome traditional lithographic limitations while maintaining proper electrode function.
Solution Approach 2:
The invention reconfigures the spatial arrangement of pixel electrodes and data lines by introducing asymmetric positioning in the planar dimension. This dimensional reorganization allows for reduced horizontal spacing between electrodes and data lines, effectively increasing transmittance without violating manufacturing constraints.
2Illumination intensity
If the data line width is reduced to increase transmittance, then the transmittance improves, but the disclination line problem occurs around the pixel electrode
Solution Approach 1:
The asymmetric arrangement of branch portions relative to the data line creates a non-uniform electric field distribution that prevents the formation of disclination lines. The non-symmetric configuration disrupts the symmetric stress patterns that typically cause disclination, allowing narrow data lines to be used without generating these harmful optical defects.
3Ease of manufacture
If the branch portions are symmetrically arranged, then the manufacturing is simpler, but the data line width cannot be reduced further and disclination lines occur
Solution Approach 1:
The invention deliberately employs asymmetric arrangement of branch portions to achieve superior optical performance. While asymmetric designs are generally more complex to manufacture, the specific asymmetric configuration shown maintains manufacturability by using standard lithographic patterns while achieving reduced data line width and eliminating disclination lines, thereby improving transmittance.
Data Source
AI summary
A pixel structure includes a substrate, a scan line, a first data line, a second data line, a first active device, a second active device, a first pixel electrode, and a second pixel electrode. The substrate has a first unit area and a second unit area. The first pixel electrode is disposed in the first unit area and includes a first main portion and first branch portions extending from the first main portion to an edge of the first unit area. The second pixel electrode is disposed in the second unit area and includes a second main portion and second branch portions extending from the second main portion to an edge of the second unit area, wherein at least a part of the first branch portions and at least a part of the second branch portions are asymmetrically arranged at two sides of the second data line.