Touch Substrate with Integrated Black Matrix and Electrode Bridges
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Solution Overview
Problem
Conventional touch display panels, especially in-cell touch panels, face challenges with high manufacturing costs and light transmission issues due to complex fabrication processes requiring multiple mask plates.
Innovation Solution
A touch substrate design featuring a black matrix layer and touch electrode layer with electrode bridges, where first and second touch electrodes are insulated and connected through a black matrix layer, reducing the need for additional insulating layers and mask plates, and incorporating color filter layers to maintain spacing and improve light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask plates are used for fabricating in-cell touch panels, then manufacturing precision can be improved, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The patent combines the black matrix layer and electrode bridge layer into a single integrated structure. The black matrix serves dual functions: defining pixel boundaries and providing electrical connection paths for the electrode bridges. This merging eliminates the need for separate mask plates for each layer, reducing manufacturing complexity while maintaining precision through the unified design approach
Solution Approach 2:
The black matrix layer is designed to perform multiple functions simultaneously: it acts as an insulating layer, a connection layer for electrode bridges, and a pixel definition layer. This multi-functionality reduces the number of separate components and mask plates required, simplifying the fabrication process while maintaining manufacturing precision
2Manufacturing precision
If multiple mask plates are used for fabricating in-cell touch panels, then manufacturing precision can be improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the black matrix and electrode bridges into a single integrated layer that can be fabricated using one mask plate. This consolidation reduces the number of mask plates from multiple to just one for this combined structure, directly lowering manufacturing costs while the careful design of the integrated structure maintains the necessary fabrication precision
Solution Approach 2:
The patent extracts the electrode bridge function from a separate layer and integrates it directly into the black matrix layer. This extraction and integration eliminates the need for additional mask plates and processing steps, reducing manufacturing cost while the precise geometric design of the integrated structure ensures fabrication precision is maintained
3Reliability
If conventional touch electrode structures are used, then electrical connectivity is ensured, but light transmission rate decreases
Solution Approach 1:
The patent applies local quality by making the electrode bridges narrow and positioning them strategically only where needed for electrical connection. The bridges are made as thin as possible locally to minimize light blocking, while still maintaining sufficient electrical conductivity. This localized optimization allows electrical connectivity to be ensured without significantly compromising the overall light transmission rate
Data Source
AI summary
The present application discloses a touch substrate including a base substrate; a touch electrode layer on a base substrate comprising a plurality of columns of first touch electrodes, a plurality of rows of second touch electrodes, and a plurality of columns of electrode bridges in a same layer and made of a same electrode material; and a black matrix layer on the base substrate. The plurality of columns of first touch electrodes are insulated from the plurality of rows of second touch electrodes, and cross over the plurality of rows of second touch electrodes forming a plurality of intersections. A plurality of first touch electrode in each column are electrically connected by a plurality of electrode bridges. A plurality of second touch electrode in each row are electrically connected by the black matrix layer.