Multi-Layer Metal Grid Touch Control Device for Bendability
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Solution Overview
Problem
Capacitive touch screens using ITO material face issues with breakage, high resistance, and cost, while active capacitive pen touch technology requires high electrical performance and uniform metal grid density, leading to visibility and response delay problems due to uneven reflectivity and impedance.
Innovation Solution
A touch control device with a metal pattern in two layers, including touch control electrodes and virtual graphics, made of the same material, forming a regular grid on a base substrate to improve bendability, light transmittance, and vanishing effect, while ensuring uniform channel impedance and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO material is used for touch control electrodes, then electrical performance is achieved, but the material is prone to breakage and has high resistance
Solution Approach 1:
The patent changes the material parameter from ITO to metal material, fundamentally altering the electrical and mechanical properties of the touch control electrode. This material substitution resolves the contradiction by providing both good electrical performance and improved mechanical strength to prevent breakage.
2Manufacturing precision
If metal grid density is increased to improve vanishing effect, then reflectivity uniformity improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent transitions from a single-layer metal grid to a multi-layer metal grid structure. This dimensional change allows the system to achieve uniform reflectivity through the layered configuration rather than relying solely on increased grid density in a single plane, thereby reducing manufacturing complexity while maintaining optical performance.
3Ease of manufacture
If single-layer metal grid is used, then manufacturing is simpler, but vanishing effect and reflectivity uniformity are insufficient
Solution Approach 1:
The patent divides the single-layer metal grid into multiple layers, with each layer having specific grid patterns. This segmentation allows each layer to contribute to the overall vanishing effect while maintaining relatively simple manufacturing processes for each individual layer, resolving the contradiction between manufacturing simplicity and optical performance.
4Stability of the object's composition
If metal material is used instead of ITO, then bendability improves, but electrical performance requirements become more challenging to meet
Solution Approach 1:
The patent employs metal materials that combine good electrical conductivity with high mechanical flexibility. This material selection creates a composite effect where both electrical performance and bendability requirements are satisfied simultaneously, overcoming the limitations of both ITO and conventional metals.
Data Source
AI summary
A touch control device is provided and includes a base substrate and a metal pattern on the base substrate. The metal pattern includes a first metal pattern and a second metal pattern. The first metal pattern and the second metal pattern are in different layers. The first metal pattern includes a first touch control electrode and a first virtual graphic that is insulated from the first touch control electrode. The second metal pattern includes a second touch control electrode and a second virtual graphic that is insulated from the second touch control electrode. An orthographic projection of the metal pattern to the base substrate is a regular grid.