Touch Panel Bridge Structure for Reducing Unwanted Capacitance
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Solution Overview
Problem
Conventional touch display devices experience large unnecessary and undesired capacitance due to the complex arrangement and structure of touch electrodes, which affects touch sensitivity and accuracy.
Innovation Solution
The touch display device incorporates a touch panel with touch electrodes arranged in a mesh pattern, where specific electrodes are electrically connected through bridges in a different layer, and dummy metals are used to adjust capacitance, reducing unwanted capacitance and improving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes are arranged in a complex shape to provide comprehensive touch sensing coverage, then touch sensing capability is improved, but large unnecessary and undesired capacitance is generated
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes arranged in a matrix pattern, where each sub-electrode can be independently controlled. This segmentation allows the system to activate only the necessary electrode segments for a given touch detection task, reducing the total capacitance involved while maintaining comprehensive sensing coverage across the display surface.
Solution Approach 2:
Different regions of the touch electrode array are assigned different functions or activation states based on local requirements. The controller can selectively activate specific rows or columns of sub-electrodes depending on where touch input is expected or needed, thereby reducing unnecessary capacitance in regions that do not require active sensing at any given moment.
2Measurement precision
If multiple touch electrodes are arranged closely together to improve touch coordinate accuracy, then detection precision is improved, but capacitance interference between adjacent electrodes increases
Solution Approach 1:
The closely spaced touch electrodes are segmented into independently controllable sub-electrodes with distinct addressing. This allows the controller to activate only specific sub-electrode pairs for detection, minimizing the number of simultaneously active electrodes and reducing capacitive coupling interference between adjacent electrodes while maintaining high spatial resolution for accurate touch coordinate detection.
Solution Approach 2:
The touch sensing operation employs periodic scanning of electrode pairs in a systematic sequence. By activating electrode pairs in alternating rows and columns during different time periods, the system reduces simultaneous capacitance interactions and allows for better signal differentiation, thereby reducing interference while maintaining accurate touch coordinate measurement capability.
3Area of stationary object
If touch electrodes are arranged in a dense pattern to reduce dead zones, then touch coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The dense touch electrode pattern is implemented using modular sub-electrode units that can be systematically arranged in matrix formations. This modular segmentation simplifies the manufacturing process by allowing standardized fabrication techniques to be applied repeatedly across the display surface, reducing overall manufacturing complexity while achieving comprehensive touch coverage with minimal dead zones.
Solution Approach 2:
The segmented sub-electrode design provides multi-functionality where each sub-electrode can serve multiple purposes: active touch detection, capacitive coupling reduction, and adaptive activation based on usage patterns. This universal design approach simplifies manufacturing by using a single repeated module for all touch sensing functions across the entire display area, rather than requiring different electrode configurations for different regions.
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 minimizes unnecessary capacitance, enhancing touch sensitivity and accuracy by optimizing the electrical connections between touch electrodes.
Implementation Method 1
a capacitance-based touch sensing method for detecting the presence or absence of a touch, touch coordinates, etc., based on a change in capacitance which is formed on a touch electrode
Data Source
AI summary
Aspects relate to a touch display device and a touch panel and, more particularly to, a touch display device and a touch panel which may prevent a large unnecessary and undesired capacitance between a bridge and a surrounding touch electrode through a change in a bridge structure for an electrical connection between the touch electrodes, thereby obtaining excellent touch sensitivity.