Segmented Dummy Leads for Short-Circuit Prevention in Array Substrates
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Solution Overview
Problem
In touch display products, leads arranged in the same layer as data lines are prone to short-circuiting, leading to voltage reduction and display quality issues such as dark lines, affecting user experience.
Innovation Solution
The array substrate design includes data lines and dummy leads in the same layer, with dummy leads composed of multiple disconnected conducting wires extending in the same direction, which reduces the length of conducting wire short-circuiting and maintains uniform voltage, and touch electrodes in a different layer to enhance display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If leads are arranged in the same layer as data lines, then the manufacturing process is simplified and device complexity is reduced, but short-circuits between leads and data lines occur causing voltage reduction and display quality degradation
Solution Approach 1:
The dummy lead is divided into multiple disconnected conducting wire segments instead of using a continuous conducting wire. These segments are arranged in the same layer as data lines but are electrically isolated from each other, preventing short-circuits while maintaining the simplified layer structure
Solution Approach 2:
Insulating layers are introduced between the disconnected conducting wire segments of the dummy lead and the data lines. These insulating layers act as intermediaries that allow the leads and data lines to coexist in the same layer while preventing electrical short-circuits
2Reliability
If continuous conducting wires are used in dummy leads, then electrical connectivity is maintained, but short-circuits with data lines cause voltage reduction and dark lines
Solution Approach 1:
The continuous conducting wire is segmented into multiple disconnected conducting wire segments. Each segment maintains local electrical connectivity for its intended function, while the disconnections prevent continuous short-circuit paths with data lines, eliminating voltage reduction and dark line issues
Solution Approach 2:
The harmful continuous conducting path that causes short-circuits is extracted and removed, while retaining the essential function of the dummy lead through the disconnected segments. The segments are strategically positioned to avoid contact with data lines while still serving the dummy lead's purpose
3Length of stationary object
If dummy leads use long continuous conducting wires, then the dummy lead function is fulfilled, but the likelihood of short-circuits with data lines increases
Solution Approach 1:
The long continuous conducting wire is divided into multiple shorter disconnected segments. This segmentation reduces the probability of any single segment contacting a data line, while the cumulative length of all segments still fulfills the dummy lead's functional requirements
Solution Approach 2:
The dummy lead's conducting path is transformed from a single-dimensional continuous line to a multi-dimensional arrangement of disconnected segments distributed in space. This dimensional transformation allows the dummy lead to maintain its length and function while reducing short-circuit risk through spatial distribution
Data Source
AI summary
The disclosure discloses an array substrate, a method for manufacturing the same, a display panel and a display device. The array substrate includes a base substrate; a plurality of data lines and a plurality of dummy leads, wherein the plurality of data lines and the plurality of dummy leads are in the same layer on the base substrate, and the plurality of data lines and the plurality of dummy leads extend along the first direction; and at least one dummy lead includes a plurality of wires which extend in the first direction and are disconnected with one another.