Touch Display Panel Repair Line Design for Broken Wire Yield
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Solution Overview
Problem
Conventional touch display panels suffer from easily broken touch wires, which cannot be inspected or repaired during production, leading to reduced product yield.
Innovation Solution
A touch display panel design that includes a plurality of touch electrode sets, touch wires, and at least one repair line, where the repair line comprises a repair section and a connection section electrically connected to each other, and is disposed insulatively from the touch wires, allowing for effective repair of broken touch wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch wire width is reduced to increase resolution, then display resolution is improved, but touch wire reliability deteriorates
Solution Approach 1:
The touch wire system is segmented into functional sections: signal transmission sections (narrow width for high resolution) and repair sections (wider width for reliability). The repair section has a greater width than the signal transmission section, providing enhanced mechanical strength and fault tolerance while maintaining high resolution in the display area.
Solution Approach 2:
A repair section is pre-configured alongside each touch wire before any failure occurs. This repair section is positioned to overlap with the touch wire's projection and includes repair electrodes and conductive structures that can be activated to restore functionality if the narrow touch wire breaks.
2Ease of manufacture
If conventional touch wire structure is used, then manufacturing process is simple, but repair capability is lost
Solution Approach 1:
The repair functionality is merged with the existing touch wire structure by integrating repair electrodes, repair lines, and conductive layers into the same multi-layer architecture as the signal transmission components. This allows repair capabilities to be added without fundamentally changing the manufacturing process or requiring separate repair systems.
Solution Approach 2:
An insulation layer with through-holes serves as an intermediary structure that enables electrical connection between the touch wire and the repair section. The through-holes allow conductive material to pass through and establish electrical pathways for repair while maintaining the insulating properties of the layer itself.
3Productivity
If touch wire breaks during production, then product yield is reduced, but inspection capability is insufficient
Solution Approach 1:
The repair section includes a repair electrode with a first reflectivity and the touch wire has a second reflectivity, where the reflectivities differ. This reflectivity contrast enables easy detection and differentiation of the repair section from the signal transmission section during optical inspection processes, allowing for identification of repair locations and verification of repair effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution enables convenient repair of broken touch wires during module inspection using processes like laser cutting and melting, thereby improving product yield and maintaining touch functionality.
Implementation Method 1
by adopting a process such as a laser cutting and melting process at an end of the touch wire connected to the touch electrode coinciding with a projection of the repair section
Implementation Method 2
laser cutting and melting process
Data Source
AI summary
An embodiment of the present application provides a touch display panel and a display device. The touch display panel disposes at least one repair line and disposes the repair line insulatively from touch wires, and the repair line includes a repair section and a connection section electrically connected each other. Extension directions of the connection section and the touch wires are the same. An orthographic projection of the touch wire corresponding to the repair section on the touch display panel partially coincides with an orthographic projection of the repair section on the touch display panel.