Display Panel Touch Wires with Width Compensation Over Dam Heights
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Solution Overview
Problem
The manufacturing process of touch wires in display panels, particularly when climbing over varying heights and intersecting functional layers, leads to issues such as short circuits and disconnections due to inconsistent line widths and heights, affecting yield and touch performance.
Innovation Solution
The touch wire design includes sub-portions with varying heights and line widths, where line widths are inversely proportional to heights, with compensation at higher elevations to maintain consistent widths, preventing short circuits and disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch wire climbs over varying heights of functional layers, then the touch wire can connect across different layers, but the line width becomes inconsistent leading to short circuits and disconnections
Solution Approach 1:
The touch wire is designed with different line widths at different heights. At higher positions where the wire climbs over functional layers, the line width is reduced to prevent short circuits between adjacent wires. At lower positions, the line width is larger to ensure adequate spacing and prevent disconnections. This local differentiation of line width based on height resolves the contradiction between connection reliability and manufacturing precision.
2Ease of manufacture
If the touch wire is designed with uniform line width, then manufacturing is simpler, but short circuits occur at higher positions due to reduced spacing
Solution Approach 1:
The line width parameter of the touch wire is changed dynamically based on the height position. The design specifies that at higher positions (first height portion), the line width should be smaller, while at lower positions (second height portion), the line width should be larger. This parameter change prevents short circuits at higher positions while maintaining manufacturability through defined design rules.
3Object-affected harmful factors
If the touch wire line width is reduced at higher positions, then short circuits are prevented, but disconnections may occur due to excessive narrowing
Solution Approach 1:
The line width is adjusted based on height with specific design constraints. The design rules specify that the line width at the first height portion should be smaller than at the second height portion, but with a maximum ratio constraint (e.g., width at first height portion should not be less than 0.5 times the width at second height portion). This controlled parameter change prevents short circuits while avoiding excessive narrowing that would cause disconnections.
Data Source
AI summary
A display panel and a display device are provided, the display panel includes a base substrate and a touch wire including a first sub-portion and a second sub-portion, a main surface of the base substrate is a first surface; the second sub-portion includes a first height portion and a second height portion, a height of the first height portion relative to the first surface is smaller than a height of the second height portion relative to the first surface, line widths of respective positions of the first height portion are inversely proportional to heights of the respective positions of the first height portion relative to the first surface, and line widths of respective positions of at least part of the second height portion are proportional to heights of the respective positions of the at least part of the second height portion relative to the first surface.