Touch Display Panel Concave Electrode Intersection Design
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Solution Overview
Problem
Existing touch display devices using metal grids as touch electrodes often exhibit Moiré-like uneven display phenomena due to widened intersection angles during the manufacturing process, leading to increased pixel coverage and compromised display effects.
Innovation Solution
A touch display panel design featuring a touch electrode with concave structures in the intersection areas of its electrode lines, reducing the vertical projection area and pixel coverage, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal grid is used as a touch electrode, then touch performance is improved through reduced parasitic capacitance, but display uniformity deteriorates due to Moiré-like uneven display phenomenon
Solution Approach 1:
The patent applies local quality by making the electrode lines have different properties in different regions. Specifically, the electrode lines are designed with varying transparency or optical properties in different areas to reduce the Moiré effect in display regions while maintaining effective touch detection properties in touch-sensitive regions. This local differentiation allows the electrode to simultaneously optimize both display uniformity and touch performance.
2Ease of manufacture
If electrode lines are made with standard width, then manufacturing is simplified, but intersection area becomes too large causing pixel coverage increase and display quality degradation
Solution Approach 1:
The patent applies curvature by designing the electrode lines with bent or curved segments instead of straight lines. The electrode lines include bent portions that allow them to intersect at smaller angles or pass closer to each other, thereby reducing the intersection area. This curved geometry enables more compact electrode intersections that cover fewer pixels while maintaining electrical connectivity and touch sensitivity.
3Ease of manufacture
If electrode lines intersect at standard angles, then photomask fabrication is easier, but intersection area increases leading to Moiré effect and poor display quality
Solution Approach 1:
The patent applies asymmetry by using non-uniform electrode line configurations where lines have different widths, orientations, or patterns in different regions. The electrode lines are designed with asymmetric properties that allow for smaller intersection areas while maintaining manufacturability. This asymmetric design breaks the regular periodicity that causes Moiré effects, thereby improving display quality while keeping the photomask fabrication process feasible.
Data Source
AI summary
A touch display panel, a manufacturing method of a touch display panel, and a display device are provided. The touch display panel includes a substrate and a touch electrode on the substrate. The touch electrode includes a first electrode line extending in a first direction and a second electrode line extending in a second direction. The second direction is different from the first direction. The touch electrode also includes an intersection area. In the intersection area, the first electrode line intersects with the second electrode line. At least one of the first electrode line and the second electrode line includes one or more concave structures in the intersection area.