Touch Substrate Mesh Electrodes Insulation Breaks
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Solution Overview
Problem
In the design of touch substrates for display devices using FMLOC technology, short circuits between metal routes in the touch structure layer due to metal remains after etching are prevalent, making it difficult to determine the specific location of poor touches and hindering timely repair and yield improvement.
Innovation Solution
A touch substrate with a mesh-type touch electrode layer featuring lead wires, first and second touch electrodes intersecting at right angles, and boundary meshes with distinct first and second breaks to ensure insulation between adjacent touch electrodes, allowing for effective identification and repair of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal mesh structure is used for touch electrodes, then touch sensitivity is improved, but short circuits occur due to metal remains after etching
Solution Approach 1:
The patent extracts the problematic continuous metal mesh structure and replaces it with isolated metal line segments separated by insulation layers. This removes the harmful conductivity while preserving the touch sensing function through the arranged metal segments, effectively eliminating short circuits caused by metal remains.
Solution Approach 2:
The patent introduces an insulation layer as an intermediary between metal routes and between the touch electrode layer and the underlying structure. This intermediary prevents direct contact and potential short circuits while allowing the touch electrode layer to function properly above the insulation barrier.
2Reliability
If metal routes are used in touch structure layer, then electrical conductivity is improved, but manufacturing precision deteriorates due to etching remains
Solution Approach 1:
The patent segments the continuous metal routes into discrete metal line segments separated by insulation layers. This segmentation allows each segment to be manufactured and positioned independently, reducing the impact of etching variations and improving overall manufacturing precision while maintaining electrical conductivity through the segmented paths.
3Difficulty of detecting and measuring
If detection device is used to identify poor touch, then defect detection capability is improved, but repair efficiency deteriorates due to inability to determine specific position
Solution Approach 1:
The patent applies local quality by creating distinct insulation structures at specific locations where metal routes intersect or adjacent to each other. These localized insulation features serve as reference points that help detection devices identify specific defect positions, enabling both detection and targeted repair of poor touches.
Data Source
AI summary
Disclosed are a touch substrate and a display device. The touch substrate includes a touch electrode layer with a mesh type structure; the touch electrode layer includes the first touch electrode including first touch sub-electrodes, and the second touch electrode including second touch sub-electrodes; each first touch sub-electrode includes first touch electrode meshes, and each second touch sub-electrode includes second touch electrode meshes; the touch electrode layer further includes boundary meshes located between adjacent first touch sub-electrode and second touch sub-electrode; each boundary mesh includes at least two first mesh lines; each first mesh line is provided with a first break; second mesh lines are arranged in a first touch electrode mesh and/or a second touch electrode mesh; the second mesh lines are provided with second breaks; and a pattern shape of the first mesh line and a pattern shape of the second mesh line are different.