Stacked Touch Electrodes With Black Matrix Insulator
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Solution Overview
Problem
Existing touch screens face challenges in improving sensitivity, shadow elimination, lightness, and thinness, particularly in capacitive touch screen technologies.
Innovation Solution
A touch substrate with a stacked arrangement of first and second touch electrodes, where the black matrix is located between them, enhancing capacitance and allowing for an in-cell or on-cell integration within display devices, thereby improving sensitivity and reducing thickness while maintaining optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional capacitive touch screen structure is used, then the basic touch function is achieved, but the sensitivity and capacitance are insufficient
Solution Approach 1:
The patent transitions from a planar arrangement of touch electrodes to a three-dimensional stacked configuration. The first and second touch electrodes are positioned at different vertical levels separated by the black matrix layer, creating overlapping projection areas that increase capacitance without expanding the horizontal footprint. This dimensional change enables enhanced touch sensitivity while maintaining a compact structure.
Solution Approach 2:
The black matrix layer is strategically positioned between the first and second touch electrodes, serving multiple functions simultaneously: it acts as an insulating layer preventing electrical interference, as a structural separator maintaining electrode spacing, and as part of the overall touch sensing architecture. This nested arrangement maximizes the utility of each layer within the stacked configuration.
2Length of stationary object
If the touch screen thickness is reduced to achieve lightness, then the device becomes thinner and lighter, but the manufacturing precision and alignment become more difficult
Solution Approach 1:
The touch screen is divided into distinct functional layers: the first touch electrode layer, the black matrix insulating layer, and the second touch electrode layer. Each layer is independently fabricated and then precisely aligned through lamination. This segmentation allows for optimized thickness control of each individual layer while maintaining overall alignment precision through standardized manufacturing processes.
Solution Approach 2:
The patent optimizes the thickness parameters of each layer to achieve the desired overall thinness. The black matrix layer thickness is controlled within 5-15 nm, and the spacing between electrodes is precisely regulated. By carefully adjusting these dimensional parameters, the patent achieves both reduced overall thickness and maintained manufacturing precision.
3Illumination intensity
If the black matrix line width is reduced to improve lightness and aperture ratio, then more light can pass through, but the shadow elimination effect may be compromised
Solution Approach 1:
The black matrix is positioned specifically in the overlapping projection areas of the first and second touch electrodes, where it is most needed for shadow elimination. Rather than uniformly distributing the black matrix across the entire display, the patent concentrates it in critical regions, optimizing both light transmission and shadow reduction locally where electrode intersections occur.
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
The solution increases capacitance, enhances sensitivity, and achieves better shadow elimination and lightness by using a three-layer structure with a black matrix as an insulating layer, simplifying the manufacturing process and reducing the number of masks required.
Implementation Method 1
the black matrix is located between the first touch electrode and the second touch electrode... a material of the black matrix is an insulating material
Implementation Method 2
an orthographic projection of the first touch electrode on the basal substrate and an orthographic projection of the second touch electrode on the basal substrate at least partially overlap with each other... effectively increases the capacitance between the first touch electrode and the second touch electrode
Data Source
AI summary
A touch substrate, a manufacturing method thereof, and a display device. The touch substrate includes: a basal substrate; a first touch electrode, a black matrix, and a second touch electrode located on a first surface of the basal substrate; an orthographic projection of the first touch electrode on the basal substrate and an orthographic projection of the second touch electrode on the basal substrate at least partially overlap with each other; the first touch electrode and the second touch electrode are insulated from each other; in an overlapping area of the first touch electrode and the second touch electrode, the black matrix is located between the first touch electrode and the second touch electrode.