Touch Unit Conductive Branch Shielding Electric Field Interference
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Solution Overview
Problem
Current capacitive touch units, especially mutual-capacitive type touch screens, suffer from lower signal noise ratio and precision in touch recognition due to interference from the electric field in the display panel, which affects the accuracy of touch recognition.
Innovation Solution
A touch unit design featuring a first touch electrode, a second touch electrode with sub-electrodes and a conductive bridge wire, and a conductive branch that is insulated from the first touch electrode, with the conductive branch's orthogonal projection falling within the region of the first touch electrode, enhancing mutual capacitance and shielding against electric field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If capacitive touch units are applied to in-cell type touch screen, then thickness and weight are reduced and light transmittance is improved, but signal noise ratio is lowered due to electric field interference
Solution Approach 1:
The patent introduces a conductive branch as an intermediary element positioned between the first touch electrode and the second touch electrode. This conductive branch serves as a mediator to enhance the mutual capacitance signal while being strategically positioned to minimize interference from the display panel's electric field, thus improving signal noise ratio without compromising the in-cell integration benefits
Solution Approach 2:
The patent applies local quality by creating a specific structural configuration where the conductive branch is positioned at a precise location relative to the touch electrodes. The orthogonal projection of the conductive branch falls within the region of the first touch electrode, creating a localized enhancement of mutual capacitance exactly where needed, while maintaining overall system integration
2Device complexity
If traditional touch electrode structure is used, then device structure is simple, but touch recognition precision is lower due to electric field interference
Solution Approach 1:
The patent segments the second touch electrode into first sub-electrode and second sub-electrode components, with the conductive branch connecting them. This segmentation allows for optimized positioning and configuration of each sub-component to maximize mutual capacitance while minimizing interference from the display panel's electric field, thereby improving touch recognition precision
Solution Approach 2:
The patent introduces a new dimensional arrangement by positioning the conductive branch such that its orthogonal projection falls within the region of the first touch electrode. This spatial arrangement in the projection dimension creates an additional capacitive coupling path that enhances signal detection without significantly increasing overall structural complexity
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 design improves the signal noise ratio and precision of touch recognition by increasing usable information in the touch inductive signal while minimizing noise interference from the display panel's electric field.
Implementation Method 1
the capacitive touch units are divided into a self-capacitive type and a mutual-capacitive type
Implementation Method 2
a capacitance between the touch electrodes in the touch unit is apt to be interfered by an electric field in the display panel
Data Source
AI summary
A touch unit and a manufacturing method thereof and a touch substrate are provided. The touch unit includes a first touch electrode, a second touch electrode and a conductive branch, the second touch electrode includes a first sub-electrode, a second sub-electrode and a conductive bridge wire, the first sub-electrode is located at one side of the first touch electrode and the second sub-electrode is located at the other side of the first touch electrode, the conductive bridge wire strides over the first touch electrode and two ends of the conductive bridge wire are connected with the first sub-electrode and the second sub-electrode respectively; and the conductive branch is connected with the second touch electrode and insulated from the first touch electrode, and an orthogonal projection of the conductive branch on a plane the first touch electrode at least partially located falls in a region corresponding to the first touch electrode.