Touch Sensor Mesh Geometry for Balanced Electrode Resistance
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Solution Overview
Problem
The existing touch sensors have unequal resistance values between transmission and reception electrodes due to differing cell arrangements, leading to higher resistance in reception electrodes.
Innovation Solution
The touch sensor design includes transmission and reception electrodes with quadrangular cells where the longer diagonal of each cell extends in the direction of the electrode, reducing the number of intersections and conductive paths, thereby lowering resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mesh pattern uses more fine lines arranged in the extending direction to increase electrode coverage, then the electrode area is improved, but the resistance value increases due to more intersections and longer conductive paths
Solution Approach 1:
The patent applies asymmetry by making the cell shape non-square with specific diagonal length relationships. The second diagonal is set to be longer than the first diagonal by a specific ratio (1.05 to 1.3 times), creating an asymmetric quadrangular cell pattern. This asymmetric configuration optimizes the balance between electrode area coverage and resistance values by controlling the aspect ratio of the cells in the mesh pattern.
Solution Approach 2:
The patent changes the geometric parameters of the mesh pattern cells, specifically the ratio of diagonal lengths. By controlling the second diagonal to be 1.05 to 1.3 times longer than the first diagonal, the invention optimizes the conductive path length and intersection density to achieve both adequate electrode area and acceptable resistance values.
2Reliability
If the cell shape is made more elongated in the extending direction to reduce the number of intersections, then the resistance value is lowered, but the electrode coverage area is reduced
Solution Approach 1:
The patent optimizes the cell geometry parameters by setting specific diagonal length ratios. The second diagonal is controlled to be 1.05 to 1.3 times the first diagonal, which provides the optimal balance between reducing resistance (by limiting excessive elongation) and maintaining adequate electrode coverage area.
Solution Approach 2:
The patent applies local quality by creating a non-uniform cell distribution pattern where the quadrangular cells have specific dimensional relationships. The varying diagonal lengths create local variations in conductive path characteristics, optimizing the trade-off between resistance and coverage in different regions of the electrode pattern.
Data Source
AI summary
Each sensor electrode includes transmission electrodes extending in a first direction, and reception electrodes extending in a second direction. Each of the transmission electrodes and the reception electrodes includes a mesh pattern formed by arranging a plurality of cells. Each cell has a quadrangular shape formed by a first diagonal and a second diagonal longer than the first diagonal. Each sensor electrode is configured so that the second diagonal extends in an extending direction of the sensor electrodes.