Parallel Touch Electrodes Reduce Channel Resistance in Large Displays
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Solution Overview
Problem
Current touch solutions for large-sized products face challenges with high resistance, leading to insensitive touch, long response times, and poor user experience due to high single channel resistance, which limits the adoption of touch technology in large-sized devices.
Innovation Solution
A touch substrate design featuring a base substrate with overlapping first and second touch electrodes connected in parallel, reducing channel resistance and improving sensitivity, along with additional features like irregular contours and floating electrodes to enhance touch sensitivity and reduce visibility of etching marks, facilitating the creation of large-sized touch products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-channel touch electrode design is used in large-sized products, then the structure is simple, but the channel resistance is high causing insensitive touch and long response time
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes (first touch electrodes and second touch electrodes) arranged in different layers. Each layer contains segmented electrodes that can be independently controlled, allowing the large-sized touch panel to be divided into multiple touch units that can be scanned sequentially, thereby reducing the channel resistance and improving touch sensitivity.
Solution Approach 2:
The patent transitions from a single-layer electrode design to a multi-layer electrode design. The first touch electrodes and second touch electrodes are arranged in different layers with overlapping areas, creating a three-dimensional electrode structure. This dimensional change allows for reduced channel resistance while maintaining large touch area.
2Measurement precision
If the touch unit size is large (e.g., 5mm*5mm), then the manufacturing is easier, but the capacitance change caused by touch pen pressing is very small making it difficult to identify
Solution Approach 1:
Each touch unit is further divided into multiple touch sub-units by the segmented electrodes in different layers. This segmentation creates smaller effective detection areas within each touch unit, increasing the capacitance change when a touch pen presses on the surface, thereby improving touch detection precision.
Solution Approach 2:
The patent applies different electrode configurations to different regions. The overlapping areas of first and second touch electrodes create localized high-sensitivity zones, while maintaining larger overall touch unit dimensions for ease of manufacture. This local quality enhancement improves detection precision without sacrificing manufacturing ease.
3Shape
If regular contour electrodes are used, then the manufacturing process is simple, but the etching marks are visible causing poor visual quality
Solution Approach 1:
The patent employs asymmetric or irregular contours for the touch electrodes instead of regular geometric shapes. This asymmetric design disrupts the regular reflection of light that causes visible etching marks, thereby improving visual quality. The irregular contours can be integrated into the existing manufacturing process with minimal additional complexity.
Data Source
AI summary
Disclosed is a touch substrate, including a base substrate; a plurality of first touch electrodes and a plurality of second touch electrodes arranged on the base substrate, wherein the plurality of first touch electrodes and the plurality of second touch electrodes have an overlapping area and are electrically insulated from each other; and a plurality of touch units arranged on the base substrate. Each of the touch units includes at least two first touch electrodes and at least one second touch electrode, and the at least two first touch electrodes in each touch unit are connected in parallel. By arranging at least two first touch electrodes connected with each other in parallel in each touch unit, the channel resistance is reduced effectively, and a large-sized touch product is realized. A method of fabricating a touch substrate, a display panel, and a display device are further disclosed.