Touch Substrate Black Matrix Shielding for Capacitance Consistency
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Solution Overview
Problem
The manufacture and use of On Glass Metal (OGM) touch panels face insufficient capacitance consistency between peripheral and in-plane channels, leading to yield issues and touch failures, especially in high-temperature and high-humidity environments.
Innovation Solution
A touch substrate design with driving and sensing electrodes arranged at different layers, where orthogonal projections of the electrodes overlap in specific regions with varying effective areas, and a black matrix is positioned to shield certain overlapping regions, reducing capacitance differences and improving consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black matrix is added to shield overlapping regions, then capacitance consistency is improved, but device complexity increases
Solution Approach 1:
The black matrix is selectively positioned to cover only specific overlapping regions (first overlapping regions) where capacitance issues occur, rather than uniformly covering all overlapping regions. This localized approach addresses the capacitance consistency problem in critical areas while minimizing the impact on overall device complexity and maintaining transparency in non-critical areas.
Solution Approach 2:
The overlapping regions are divided into two categories: first overlapping regions (where the black matrix is applied) and second overlapping regions (where it is not). This segmentation allows differential treatment of different overlapping areas based on their specific capacitance characteristics and functional requirements.
2Reliability
If mesh density of peripheral electrodes is reduced, then capacitance consistency is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different mesh densities are applied to different regions: peripheral driving and sensing electrodes have a first mesh density, while central electrodes have a second mesh density. This local differentiation allows optimization of capacitance consistency in peripheral regions without compromising the overall manufacturing precision, as the mesh density variation is built into the design rather than requiring tight process control.
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
This design enhances capacitance consistency between peripheral and in-plane channels, preventing yield issues and touch failures by reducing capacitance variations, thereby ensuring reliable touch panel performance.
Implementation Method 1
a black matrix arranged at a peripheral region of the touch substrate... an orthogonal projection of the black matrix onto the base substrate overlaps each first overlapping region
Data Source
AI summary
The present disclosure provides a touch substrate, a method for manufacturing the touch substrate and a touch display device. The touch substrate includes a base substrate, a plurality of driving electrodes and a plurality of sensing electrodes arranged at different layers on the base substrate, and a black matrix arranged at a peripheral region of the touch substrate. Orthogonal projections of the driving electrodes onto the base substrate overlap orthogonal projections of the sensing electrodes onto the base substrate at a plurality of first overlapping regions and a plurality of second overlapping regions, an orthogonal projection of the black matrix onto the base substrate overlaps each first overlapping region and does not overlap each second overlapping region, and an effective area of the first overlapping region is smaller than an effective area of the second overlapping region.