Hexagonal Electrode Touch Panel Resistivity Reduction
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Solution Overview
Problem
Conventional touch panels face issues with high resistivity and trace phenomena, especially in large-size widescreen designs, and have limited touch sensing capabilities due to the thickness of the transparent insulating layer and the rhombus-shaped electrodes.
Innovation Solution
A touch panel design featuring a transparent substrate, a first electrode layer with parallel hexagon-shaped electrodes, a thin transparent insulating layer, a second electrode layer with complementary ten-sided electrodes, and a cover layer, where the electrodes are connected in series with interconnect elements and have a gap between them ranging from 30 micrometers to 300 micrometers, enhancing touch sensing and reducing resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the transparent insulating layer is minimized to reduce overall thickness, then the overall thickness is reduced, but the X-axis and Y-axis electrode layers suffer high resistivity
Solution Approach 1:
The patent changes the geometric parameters of the electrodes from conventional rhombus shapes to hexagon shapes with specific side lengths (first side length a1, second side length a2) and controlled gaps (30-300 micrometers). This parameter optimization allows the electrodes to maintain low resistivity even with a thinner transparent insulating layer (50-200 micrometers), resolving the contradiction between reduced thickness and maintained electrical performance
Solution Approach 2:
The patent employs composite electrode structures combining conductive materials with specific geometric configurations. The hexagonal electrodes with complementary shapes create a composite sensing system where the electrode geometry itself enhances electrical conductivity and touch sensing capability, allowing thin insulating layers without compromising resistivity
2Length of stationary object
If the thickness of the transparent insulating layer is minimized, then the overall thickness is reduced, but trace phenomenon occurs impacting visual appearance
Solution Approach 1:
The patent optimizes the gap parameter between complementary hexagonal electrodes to 30-300 micrometers, which is sufficient to prevent trace phenomena while maintaining thin overall structure. This parameter adjustment ensures that the electrodes are spaced adequately to avoid visual defects while still allowing thin insulating layer usage
3Device complexity
If conventional rhombus-shaped electrodes are used, then the structure is simple, but touch sensing is insufficient
Solution Approach 1:
The patent employs asymmetric complementary hexagonal electrode shapes where the first and second electrodes have different orientations and gap configurations. This asymmetric design creates enhanced electric field interactions that significantly improve touch sensing capability while maintaining manufacturing simplicity through standardized hexagonal geometries
Solution Approach 2:
The patent transitions from conventional two-dimensional rhombus electrodes to three-dimensional configured hexagonal electrodes with vertical spacing (30-300 micrometers). This dimensional addition creates multiple sensing zones and enhances the electric field distribution, thereby improving touch sensing precision without substantially increasing planar complexity
4Area of stationary object
If large-size widescreen touch panels are applied, then the display area is increased, but resistivity increases
Solution Approach 1:
The patent segments the large electrode structures into multiple smaller hexagonal electrode units arranged in parallel, each with optimized dimensions (sides a1 and a2) and connected through interconnect elements. This segmentation allows the overall large display area to be achieved while maintaining low resistivity in each individual electrode segment, preventing the resistivity increase that would occur in monolithic large electrodes
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 design achieves a thinner and more lightweight touch panel with improved touch sensing capabilities, reducing resistivity and enhancing the detection of touch positions, including floating touches, by increasing the intensity of magnetic force lines and expanding the sensing field through the cover layer.
Implementation Method 1
the magnetic force lines, which are generated from the first electrodes and the second electrodes, exist in the cover layer or pass through the cover layer
Implementation Method 2
A transparent insulating layer, which is disposed between the X-axis electrode layer and the Y-axis electrode layer, is used to insulate the X-axis electrode layer from the Y-axis electrode layer
Implementation Method 3
A capacitor-based touch panel is a commonly used touch panel that utilizes a capacitive coupling effect to detect touch position. Specifically, changes in capacitance corresponding to the touch position are detected when a finger touches a surface of the touch panel
Data Source
AI summary
A touch panel includes a first electrode layer and a second electrode layer disposed above a transparent substrate. At least one transparent insulating layer is disposed between the first electrode layer and the second electrode layer. The electrode pattern of the first electrode layer has more than four sides, and the electrode pattern of the second electrode layer substantially complements the electrode pattern of the first electrode layer. A gap between the first electrodes and the second electrodes is between 30 and 300 micrometers. A cover layer is formed above the second electrode layer, and magnetic force lines, generated from the first electrode and the second electrode, exist in the cover layer or pass through the cover layer.