Touch Panel Electrode Lattice Pattern for Display Interference Fringe Elimination
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Solution Overview
Problem
Conventional electrostatic capacitive touch panels face issues with interference fringes and image degradation due to the parallel alignment of electrode patterns and pixel patterns, leading to nonuniformity and visibility of gaps between electrodes when stacked with display panels.
Innovation Solution
The touch panel design features a transparent dielectric layer with first electrodes extending along one direction on the front surface and second electrodes along the perpendicular direction on the reverse surface, incorporating main and sub-electrode wirings that cross each other, forming a lattice-like pattern without gaps, which complements the electrode pattern and pixel pattern alignment, thereby avoiding interference fringes and enhancing homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode patterns are aligned parallel to pixel patterns, then manufacturing is simplified, but interference fringes and image degradation occur
Solution Approach 1:
The patent applies asymmetry by intentionally misaligning the electrode pattern relative to the pixel pattern. Specifically, the electrode pattern is shifted so that electrode lines do not parallelly align with pixel boundaries, creating an asymmetric relationship between the two patterns. This asymmetric arrangement eliminates the regular interference fringes that occur with parallel alignment, while still maintaining manufacturing simplicity through a single-layer transparent electrode structure.
2Ease of manufacture
If gaps exist between electrodes, then electrode fabrication is easier, but nonuniformity and visibility of gaps degrade the display
Solution Approach 1:
The patent applies local quality by varying the electrode pattern density and gap distribution across different regions. The electrode lines are designed with non-uniform spacing and varying transparency, creating local variations in optical properties. This allows gaps to exist for fabrication ease while the overall pattern maintains visual uniformity, as the non-uniform local characteristics average out to eliminate visible nonuniformity across the entire display.
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
This configuration effectively reduces the occurrence of interference fringes and image degradation, simplifies manufacturing, and enhances the homogeneity of the electrode pattern, ensuring a uniform and visually appealing display without recognizing different images between electrode regions.
Implementation Method 1
A change in electrostatic capacitance between one first electrode and each of the plurality of second electrodes is detected for every first electrode, thereby detecting the contact location of a finger on the operation surface of the touch panel
Data Source
AI summary
A touch panel including a transparent dielectric layer having a front surface and a reverse surface opposite to the front surface, first electrodes each extended in a first direction of a pixel matrix and formed on the front surface of the transparent dielectric layer such that the first electrodes are arranged in a second direction of the pixel matrix which crosses with the first direction, and second electrodes each extended in the second direction and formed on the reverse surface of the transparent dielectric layer such that the second electrodes are arranged in the first direction. Each of the first electrodes includes first main electrode wirings and first sub electrode wirings. Each of the second electrode includes second main electrode wirings and second sub electrode wirings. The first main electrode wirings cross the second main electrode wirings when viewed from the front surface of the dielectric layer.