Touch Substrate Black Matrix Segmentation for ESD Prevention
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Solution Overview
Problem
Conventional touch substrates suffer from electrostatic discharge issues due to the deterioration of the black matrix layer during high-temperature processing, leading to touch control malfunctions.
Innovation Solution
A touch substrate design featuring a black matrix layer with reduced thickness in specific regions underneath the touch electrode blocks, spaced apart by gaps, which prevents electrostatic discharge by isolating the black matrix material from the touch electrode blocks, and an auxiliary black matrix layer to block light transmission through additional gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix layer is made thick to ensure light blocking, then light blocking performance is improved, but electrostatic discharge risk increases due to material deterioration during high-temperature processing
Solution Approach 1:
The black matrix layer is segmented into multiple layers with different thicknesses. The first black matrix layer has a first thickness in a first area, while the second black matrix layer has a second thickness (greater than the first) in a second area. This segmentation allows different regions to serve different functions: light blocking where needed and electrostatic discharge prevention where critical.
Solution Approach 2:
Different regions of the black matrix layer are assigned different thicknesses based on local requirements. The first area has a thinner black matrix layer sufficient for light blocking, while the second area has a thicker black matrix layer providing enhanced electrostatic discharge resistance. This local quality variation optimizes both light blocking performance and electrostatic discharge resistance without unnecessary material usage throughout the entire structure.
2Reliability
If the black matrix layer thickness is reduced to prevent electrostatic discharge, then electrostatic discharge resistance is improved, but light blocking performance deteriorates
Solution Approach 1:
The black matrix layer is divided into multiple layers with different thicknesses. The first black matrix layer provides baseline light blocking with thinner material, while the second black matrix layer provides enhanced electrostatic discharge resistance in specific areas with greater thickness. This segmentation resolves the contradiction by providing different thicknesses in different locations.
Solution Approach 2:
The black matrix layer exhibits local quality variation where the first area has a first thickness optimized for light blocking, and the second area has a second thickness optimized for electrostatic discharge resistance. This local differentiation allows each region to perform its primary function effectively without compromising the other.
3Reliability
If gaps are introduced in the black matrix layer to isolate touch electrode blocks, then electrostatic discharge prevention is improved, but light transmission control becomes more complex
Solution Approach 1:
The black matrix layer is segmented into multiple layers that can be independently controlled. The first black matrix layer and second black matrix layer can be selectively positioned and sized to create gaps where needed for electrostatic discharge prevention, while maintaining continuous coverage in areas requiring light blocking. This segmentation simplifies the control of light transmission compared to a single complex layer.
Solution Approach 2:
The multi-layer black matrix structure allows local quality variation where gaps can be introduced in specific regions to prevent electrostatic discharge, while other regions maintain continuous black matrix coverage for light blocking. This local control reduces the overall complexity of light transmission management by addressing gaps only where necessary.
Data Source
AI summary
The present application discloses a touch substrate including a base substrate; a black matrix layer on the base substrate in a black matrix area of the touch substrate; and a touch electrode layer on a side of the black matrix layer distal to the base substrate in a touch electrode area of the touch substrate. The touch electrode area partially overlaps with the black matrix area thereby forming an overlapping area. The touch electrode layer includes a plurality of touch electrode blocks at least partially in the overlapping area. A touch electrode block at least partially in the overlapping area is spaced apart from adjacent touch electrode blocks by a first gap. The black matrix layer in at least a portion of a region on a side of the first gap proximal to the base substrate has a reduced thickness relative to a thickness of a remaining portion of the black matrix layer.