Display Panel Touch Wiring Layout to Prevent FMLOC Short Circuits
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Solution Overview
Problem
The FMLOC process in display panels is prone to short-circuit defects due to potential short circuits between touch wirings.
Innovation Solution
The display panel design includes a touch organic layer exposing touch pins and a touch relay wire extending between the organic layer and the base substrate, with touch wirings connected via holes, and a layered touch metal structure to prevent direct protrusion and minimize slope-induced short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch wiring protrudes from the touch organic layer to connect with the touch pin, then the connection is more direct and simpler, but the slope at the edge of the organic layer increases causing short-circuit defects
Solution Approach 1:
The patent introduces a relay wire as an intermediary component between the touch pin and the touch wiring. The relay wire extends from the touch pin through the touch organic layer to connect with the touch wiring, eliminating the need for the touch wiring itself to protrude. This mediator approach maintains electrical connection while preventing the harmful protrusion that causes short circuits at the organic layer edge.
Solution Approach 2:
The patent segments the connection path into two distinct parts: the relay wire that penetrates the organic layer to connect the touch pin, and the touch wiring that remains embedded within the organic layer. This segmentation allows the relay wire to handle the protrusion function while the touch wiring stays protected, thus resolving the contradiction between connection simplicity and short-circuit prevention.
2Reliability
If the touch wiring is embedded in the touch organic layer without protrusion, then short-circuit defects are reduced, but the connection complexity increases
Solution Approach 1:
The patent merges the functions of the relay wire and touch wiring into a unified connection system. The relay wire and touch wiring are electrically connected through a via hole, creating an integrated pathway from the touch pin to the touch channel. This merging approach maintains reliability by embedding the touch wiring while managing complexity through functional integration rather than separate independent connections.
3Volume of moving object
If the FMLOC process is used to combine display and touch modules, then thickness and cost are reduced, but short-circuit defects between touch wirings increase
Solution Approach 1:
The patent applies local quality by differentiating the structural requirements of different components within the FMLOC architecture. The touch pin area allows protrusion and direct connection, while the touch wiring area maintains embedding within the organic layer. This localized differentiation enables the FMLOC process to achieve thinness and cost reduction while preventing short-circuit defects in the critical wiring regions.
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 through a via hole.