Display Substrate Signal-Line Structure to Reduce Static Short Circuits
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Solution Overview
Problem
The integration of a touch function in OLED display devices is prone to short circuits due to the accumulation of static electricity on signal lines with significantly different line widths, leading to defects and reduced reliability.
Innovation Solution
A display substrate design with signal lines featuring a first-layer wiring and a second-layer wiring that overlap perpendicularly, where at least one of the signal lines is disconnected to reduce static electricity accumulation, and the second-layer wiring remains continuous, ensuring electrical connectivity through via holes and bridge layers to maintain signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal lines with significantly different line widths are used to integrate touch function in OLED display, then the touch function and display function can be integrated, but static electricity accumulates on the signal lines causing short circuits
Solution Approach 1:
The signal line is divided into multiple segments along its length, with insulating layers placed between adjacent segments. This segmentation prevents continuous static electricity accumulation along the entire signal line while maintaining electrical connectivity through via holes that penetrate the insulating layers at specific locations.
Solution Approach 2:
An insulating layer is introduced as an intermediary element between adjacent signal line segments. This insulating layer acts as a mediator that blocks static electricity accumulation and potential short circuits, while via holes provide controlled electrical connection points where signal transmission is required.
2Reliability
If the first-layer wiring is disconnected to reduce static electricity accumulation, then short circuit risk is reduced, but electrical connectivity must be maintained through second-layer wiring
Solution Approach 1:
The wiring structure transitions from a single-layer disconnected design to a multi-layer configuration. The first-layer wiring is disconnected to prevent static electricity accumulation, while the second-layer wiring provides continuous electrical connectivity. Via holes vertically connect the two layers, effectively solving the contradiction by adding a dimensional aspect to the wiring architecture.
3Reliability
If via holes are used to maintain electrical connectivity through insulating layers, then signal transmission is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layers and via hole structures are pre-configured during the manufacturing process before final assembly. The via holes are positioned and formed in advance at precise locations where electrical connectivity is required, ensuring proper alignment and reducing the complexity of subsequent manufacturing steps.
Data Source
AI summary
A display substrate includes a base substrate, touch electrodes, and signal lines. At least some of the signal lines are electrically connected to the touch electrodes. The signal line includes a first signal line and a second signal line adjacent to each other. The first signal line and the second signal line respectively comprise a first-layer wiring and/or a second-layer wiring overlapped with each other in a direction perpendicular to the base substrate and electrically connected to each other. A line width of the first signal line is greater than a line width of the second signal line. The first-layer wiring of at least one of the first signal line or the second signal line is disconnected, and the second-layer wiring of the first signal line is continuous in a disconnected position.