Capacitive Touch Panel Electrodes with Protrusions
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Solution Overview
Problem
Capacitive touch panels face challenges in achieving high touch accuracy due to non-uniformity in the electrical field distribution, which affects the sensitivity and response time.
Innovation Solution
The design incorporates multiple sensing electrodes with protrusions and concave portions arranged in specific patterns to enhance the uniformity of the electrical field, improving touch accuracy and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the capacitance and capacitance variation ratio are increased to improve touch sensitivity, then touch sensitivity improves, but response time increases
Solution Approach 1:
The patent applies local quality by creating protrusions at specific locations on the sensing electrodes to generate localized high-density electric field regions. These protrusions concentrate the electric field in critical areas, enhancing touch sensitivity without requiring a uniform increase in overall capacitance, thus avoiding the trade-off with response time.
Solution Approach 2:
The patent changes the geometric parameters of the sensing electrodes by adding protrusions with specific dimensions and arrangements. This modifies the electric field distribution characteristics, enabling improved sensitivity through enhanced capacitance variation at touch points while maintaining overall system response characteristics.
2Measurement precision
If the uniformity of capacitance variation is improved to increase touch accuracy, then touch accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the sensing electrode surface into multiple regions with protrusions at different locations. This segmentation creates distinct high-density electric field zones that collectively improve uniformity across the entire touch surface, achieving better touch accuracy without requiring complete redesign of the entire electrode structure.
Solution Approach 2:
The patent employs asymmetric protrusion designs where protrusions are strategically positioned at specific locations rather than uniformly distributed. This asymmetric arrangement optimizes electric field distribution in critical areas, improving touch accuracy while minimizing the increase in structural complexity compared to symmetric uniform designs.
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 improved electrical field uniformity leads to increased touch accuracy and sensitivity, allowing for more precise detection of touch positions and reduced error rates.
Implementation Method 1
the capacitive touch panel senses capacitance variation (or electric field variation) between the sensing electrodes and converts a contact position into an electrical signal
Implementation Method 2
senses capacitance variation (or electric field variation) between the sensing electrodes
Data Source
AI summary
A touch panel comprises multiple first sensing electrodes constituting multiple rows, wherein the first sensing electrodes in each of the rows are electrically connected to each other, multiple second sensing electrodes constituting multiple columns crossing the rows, wherein the second sensing electrodes in each of the columns are electrically connected to each other, and multiple conductive patterns disposed between the first and second sensing electrodes. Each of the first and second sensing electrodes comprises multiple protrusions protruding outward from a corresponding boundary and multiple concave portions extending inward between the protrusions in a plan view. Pairs of protrusions extending from opposite sides of each of the first and second sensing electrodes are disposed opposite each other and are symmetrical to each other.