Parallel Electrode Touch Panel for Uniform Field Distribution
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Solution Overview
Problem
Existing touch panels face challenges in achieving low power consumption and uniform electrical field distribution, particularly near the edges, which affects their performance and efficiency.
Innovation Solution
A touch panel design featuring parallel electrodes with a substrate, conductive layer, corner electrodes, and edge resistance, where parallel electrodes in the x-axis and y-axis are connected to a voltage-controlled unit and isolated from the edge resistance, improving electrical field uniformity and reducing power consumption by using silver conductive wires with low resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional four-corner electrodes are used for touch detection, then the touch panel can detect touch position, but the electrical field distribution becomes non-uniform near the edges and power consumption increases
Solution Approach 1:
The patent divides the electrode structure into multiple segments: four corner electrodes (A, B, C, D) and additional parallel electrodes (PA, PB, PC, PD) positioned along the edges. This segmentation allows each electrode group to contribute differently to the electrical field distribution, creating more uniform field coverage across the entire touch panel surface while reducing the need for high voltage at any single location, thereby lowering overall power consumption.
Solution Approach 2:
The patent applies different electrode configurations to different regions of the touch panel. The corner electrodes maintain their traditional positioning for basic touch detection, while parallel electrodes are specifically added along the edges where electrical field uniformity is poorest. This local enhancement approach improves overall field uniformity without unnecessarily increasing power consumption across the entire panel.
2Reliability
If voltage is increased to improve electrical field uniformity near edges, then field distribution improves, but power consumption increases
Solution Approach 1:
By segmenting the electrode system into corner and parallel electrode groups, the patent distributes the voltage application across multiple locations. This allows the electrical field to be built up gradually and uniformly across the panel without requiring a single high-voltage source, thereby reducing energy loss while achieving field uniformity.
Solution Approach 2:
The parallel electrodes act as intermediary elements between the corner electrodes and the touch surface. They provide intermediate voltage distribution points that help maintain uniform electrical field strength across the panel, particularly in edge regions, without requiring excessive voltage that would lead to energy loss.
3Reliability
If traditional electrode configuration is used, then device complexity remains low, but electrical field uniformity deteriorates near edges
Solution Approach 1:
The electrode structure is segmented into modular components: four corner electrodes and four parallel electrode pairs. Each segment performs a specific function (corner electrodes for basic detection, parallel electrodes for edge field enhancement), making the overall complex structure manageable and maintainable while achieving superior electrical field uniformity.
Solution Approach 2:
The parallel electrodes serve multiple functions: they enhance electrical field uniformity in edge regions, provide additional touch detection points, and work cooperatively with the corner electrodes to create a comprehensive detection network. This multi-functionality justifies the increased structural complexity by delivering multiple performance benefits simultaneously.
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 low power consumption and enhanced electrical field uniformity near the edges, allowing for precise touch detection with reduced voltage drops and improved reliability, while maintaining effective touch position detection in both axes.
Implementation Method 1
A uniform electrical field is formed on the ITO layer. The capacitive charge effect results from the panel being touch by the fingers.
Implementation Method 2
The conductive layer enclosed by the chains of series resistances, CAR-YU, CAR-YD, CAR-XR and CAR-XL around conductive layer 11, is the effective touch area.
Data Source
AI summary
The disclosure discloses a touch panel with parallel electrodes. The parallel electrodes mainly include a pair of parallel electrodes in x-axis and a pair of parallel electrodes in y-axis, further forming a ring structure by means of a series connection of eight corner resistances. The ring structure is the improvement of the electrode design, and is formed on the conductive layer of touch panel with a chain of series resistances. The voltage support of the conductive layer of the ring structure is provided by the corner electrodes on the conductive layer for touch detection.