Touch Control Panel Electrode Bending for Flexible Deformation
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Solution Overview
Problem
Existing touch panels with curved surfaces face issues such as poor alignment accuracy, stretch damage, and cracking when an add-on touch screen is attached, due to groove designs that lead to single trace of touch metal grid, high trace resistance, RC delay, low mutual capacitance, and poor touch accuracy.
Innovation Solution
A touch panel design featuring a base substrate with first and second touch electrodes forming interdigital structures, including bending parts and connection electrodes, which are insulated and electrically communicated to enhance mutual capacitance and sensitivity, while grooves on the substrate allow for flexible deformation without overlapping with touch electrodes, reducing damage during stretching and rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If grooves are designed on the touch screen to increase tensile deformation amount, then stretching and attaching becomes easier and damage to key components is reduced, but single trace of touch metal grid occurs, communication between grids becomes poor, trace resistance increases, RC delay increases, spacing between metal grids increases, mutual capacitance value decreases, and touch accuracy deteriorates
Solution Approach 1:
The touch electrode is divided into multiple traces instead of using a single trace design. This segmentation allows the electrode structure to accommodate grooves while maintaining multiple conduction paths, thereby reducing the impact of groove-induced trace resistance increases and improving grid communication.
Solution Approach 2:
The patent introduces a multi-dimensional electrode layout where electrodes are arranged in both horizontal and vertical directions, forming a grid structure. This dimensional expansion allows the touch panel to maintain effective capacitance coupling even when grooves are present, as electrodes can communicate through multiple spatial paths rather than relying on single-trace connections.
2Adaptability or versatility
If curved surfaces are formed on the display substrate periphery, then the display substrate can accommodate flexible display requirements, but poor alignment accuracy, stretch damage, and cracking occur when an add-on touch screen is attached
Solution Approach 1:
The patent employs curved electrode traces that follow the contour of the display substrate's curved surfaces. This curvature adaptation allows the touch electrode structure to conform to the flexible display geometry while maintaining electrical continuity and alignment accuracy, preventing stretch damage and cracking during attachment.
Solution Approach 2:
The electrode trace geometry parameters are adjusted to match the curved surface characteristics of the display substrate. By changing the trace curvature radius and path configuration, the electrode structure adapts to flexible display requirements while maintaining reliable electrical connections and avoiding structural failure during attachment processes.
3Measurement precision
If extension lengths of touch electrodes are increased to enhance mutual capacitance, then touch sensitivity and accuracy improve, but the touch panel becomes more susceptible to damage during stretching and rolling
Solution Approach 1:
The electrode structure is segmented into multiple shorter traces arranged in parallel rather than using few long traces. This segmentation maintains the total extended length needed for high mutual capacitance while distributing mechanical stress across multiple segments, thereby improving resistance to stretch damage and rolling deformation.
Solution Approach 2:
The electrode traces are designed with flexible routing that can dynamically accommodate deformation during stretching and rolling. The traces include bendable sections and redundant paths that allow the structure to flex without breaking, maintaining electrical connectivity even when the panel undergoes mechanical stress.
Data Source
AI summary
Disclosed are a touch-control panel and a preparation method therefor, and a display apparatus. The touch-control panel comprises: a substrate, a plurality of first touch-control electrodes which are arranged on the substrate at intervals and extend in a first direction, and a plurality of second touch-control electrodes which are arranged on the substrate at intervals and extend in the first direction, wherein the first touch-control electrodes and the second touch-control electrodes are insulated from each other; the first touch-control electrodes and the second touch-control electrodes cross to form a first interdigital structure; and first bending parts extending towards the outer sides of the first touch-control electrodes are formed on side parts of the first touch-control electrodes, or, second bending parts extending towards the outer sides of the second touch-control electrodes are formed on side parts of the second touch-control electrodes.