Mesh-Shaped Touch Panel Signal Line Connection for Reduced Non-Display Area
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Solution Overview
Problem
Touch panels in display devices often have a visible connection part for signal lines, which increases the non-display area and can lead to static electricity issues due to varying resistance at the connection boundaries, affecting user experience and device reliability.
Innovation Solution
A touch panel design featuring a connection part with a mesh shape formed by mesh holes in both the touch sensor and signal line, using a transparent conductive layer and a metal layer, which reduces the visibility of the signal line and maintains constant resistance, preventing static electricity from opening boundaries between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal line connection part is made visible to ensure proper electrical connection, then the electrical connectivity is improved, but the non-display area increases and aesthetic quality deteriorates
Solution Approach 1:
The connection part is designed with a mesh structure containing multiple holes, allowing light to pass through while maintaining electrical conductivity. This porous configuration reduces the visible area of the connection part, thereby decreasing the non-display area and improving aesthetic quality while preserving electrical connectivity through the remaining conductive material.
Solution Approach 2:
The connection part employs a composite structure combining transparent conductive layer and metal layer. This composite material approach enables the connection part to maintain electrical conductivity while having reduced visual visibility, thus shrinking the perceived non-display area without compromising electrical connectivity.
2Reliability
If the connection part has a large area to ensure low resistance, then electrical conductivity is improved, but the visibility of the signal line increases and aesthetic quality worsens
Solution Approach 1:
The mesh structure with multiple holes reduces the visible area of the connection part by allowing light transmission through the holes. The conductive material is distributed in a grid pattern that maintains sufficient conductivity while presenting a less visible appearance, thus improving aesthetic quality without significantly increasing resistance.
Solution Approach 2:
The connection part has different properties in different regions: the mesh structure provides conductivity where needed while having gaps (holes) where visibility is reduced. This local variation in material distribution allows the connection part to simultaneously achieve low resistance in conductive paths and reduced visibility in the overall structure.
3Manufacturing precision
If the connection part boundary is sharp to ensure clear component separation, then manufacturing precision is improved, but resistance variation increases and static electricity issues worsen
Solution Approach 1:
The connection part is segmented into multiple conductive elements arranged in a mesh pattern, rather than being a single continuous structure. This segmentation creates multiple parallel conduction paths, which reduces resistance variation and prevents static electricity accumulation by distributing electrical flow across numerous pathways, thereby improving reliability while maintaining clear component boundaries.
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, a window member on the display panel and including a display area for transmitting the image, and a non-display area adjacent the display area, and a touch panel between the display panel and the window member, the touch panel including a touch sensor corresponding to the display area and including a sensor part and a connection part and a signal line including a connection part coupled to and overlapping the connection part of the touch sensor, and a line part coupled to the connection part of the signal line, wherein the connection part of the touch sensor and the connection part of the signal line define a plurality of mesh holes.