Embedded Touch Wiring Layout to Prevent Display Panel Shorts
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Solution Overview
Problem
The FMLOC process in display panels is prone to short-circuit defects due to short circuits between touch wirings, which can occur when the touch wiring protrudes from the touch organic layer and forms a conductive connection at the edge of the organic layer during patterning.
Innovation Solution
The touch wiring is designed to not protrude from the touch organic layer and is connected to a touch relay wire through a via hole, with additional pin protection parts and a touch relay wire extending between the touch organic layer and the base substrate, ensuring electrical connection without direct exposure, thereby preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch wiring protrudes from the touch organic layer to ensure electrical connection, then the electrical connection is simplified, but short-circuit defects occur between touch wirings
Solution Approach 1:
The patent introduces a touch relay wire as an intermediary component between the touch wiring and the touch pin. The touch relay wire extends from the touch pin through the touch organic layer to connect with the touch wiring, which does not protrude from the touch organic layer. This intermediary structure eliminates direct exposure of conductive materials at edges while maintaining electrical connectivity, thus preventing short-circuit defects between touch wirings.
2Reliability
If the touch wiring does not protrude from the touch organic layer to prevent short circuits, then manufacturing reliability improves, but additional structures like via holes and relay wires are required
Solution Approach 1:
The patent segments the electrical connection path into distinct functional parts: the touch wiring embedded in the touch organic layer, the via hole for vertical connection, and the touch relay wire extending to the touch pin. This segmentation allows each component to perform its specific function optimally while preventing short circuits, as the touch wiring remains protected within the organic layer without requiring complex external routing structures.
Solution Approach 2:
The patent transitions the connection approach from a two-dimensional surface-level protruding wiring to a three-dimensional embedded structure with via holes and relay wires extending through layers. This dimensional change allows electrical connection without surface exposure, preventing short circuits while managing the increased structural complexity through vertical integration rather than horizontal expansion.
3Reliability
If pin protection parts are added to protect the touch pin, then reliability against short circuits improves, but the device structure becomes more complex
Solution Approach 1:
The pin protection parts are incorporated into the touch organic layer structure before the touch wiring is formed. By preliminarily establishing this protective barrier within the organic layer, the design prevents potential short circuits at the touch pin location without requiring additional post-processing steps or complex external protection mechanisms, thus managing structural complexity through integrated preliminary design.
Data Source
AI summary
A display panel includes a base substrate, a driving layer, a pixel layer and a touch layer stacked sequentially. In a peripheral area of the display panel, the driving layer is provided with a touch pin and a touch relay wire connected with the touch pin; the touch layer includes a touch organic layer and a touch metal layer buried in the touch organic layer, and the touch metal layer is formed with a touch channel and a touch wiring connected with the touch channel. The touch organic layer exposes the touch pin, and an end of the touch relay wire away from the touch pin extends between the touch organic layer and the base substrate. The touch wiring does not protrude out of the touch organic layer, and the touch wiring is electrically connected to the end of the touch relay wire away from the touch pin.