Capacitive Touch Panel Edge Precision via Border Sensing Nodes
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Solution Overview
Problem
Capacitive touch sensing panels face inaccuracies in detecting touch positions at the edges and corners of the active area due to insufficient sensing nodes, leading to erroneous touch position detection.
Innovation Solution
The design includes a touch sensing panel with conductive electrode serials and sensing nodes positioned along the borders and outside the active area, with larger electrode patterns on the edges and corners, ensuring more nodes are available for accurate touch position calculation at these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing nodes are positioned only within the active area, then the device complexity is reduced, but the touch precision at edges and corners deteriorates
Solution Approach 1:
The patent extends the sensing node arrangement from the two-dimensional active area into the third spatial dimension by positioning nodes in the border area and outer area surrounding the active area. This dimensional extension provides additional sensing nodes for edge and corner detection without complicating the internal active area structure.
Solution Approach 2:
The patent applies different sensing node densities to different regions: the active area has a first density, the border area has a second density, and the outer area has a third density. This local differentiation optimizes touch precision where needed (edges and corners) while maintaining simplicity in the center region.
2Measurement precision
If electrode patterns are enlarged at edges and corners, then the touch precision at these areas is improved, but the area occupied by electrodes increases
Solution Approach 1:
The patent makes the electrode patterns non-uniform by enlarging them specifically at edge and corner regions while keeping the central electrode patterns at standard size. This local enlargement improves capacitive coupling and sensing precision at edges and corners without significantly increasing the total electrode area.
Solution Approach 2:
The electrode patterns are segmented into different regions (central region and edge/corner regions) with different sizes. This segmentation allows optimized electrode dimensions for each functional region, improving overall touch precision without uniform area increase.
3Measurement precision
If sensing nodes are positioned in the border area and outer area, then the touch position detection accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The sensing nodes in the border area and outer area serve multiple functions: they detect touches near edges and corners, provide reference signals for position calculation, and extend the sensing range beyond the active area. This multi-functionality justifies the extended structure.
Solution Approach 2:
The patent positions sensing nodes in the border area and outer area, extending the sensing array beyond the traditional active area boundaries. This dimensional extension enables accurate detection of touches at edges and corners while maintaining a systematic grid structure that doesn't overly complicate the device.
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 enhances touch precision by utilizing additional sensing nodes at edges and corners, reducing error rates and providing more precise touch position detection compared to traditional designs.
Implementation Method 1
The capacitive type touch sensing panel senses a touched position according to a difference in capacitance created in an upper or lower plate when the user physically contacts with a conductive film formed on the upper or lower plate
Data Source
AI summary
Provided is a touch sensing panel including a substrate that includes a touch electrode formation area and an active area formed within the touch electrode formation area; a plurality of first conductive electrode serials that are arranged on the touch electrode formation area of the substrate in such a manner that the first conductive electrode serials are separated from one another along a first direction; a plurality of second conductive electrode serials that are arranged on the touch electrode formation area of the substrate in such a manner that the second conductive electrode serials are separated from one another along a second direction intersecting the first direction and that are electrically insulated from the first conductive electrode serials; and a plurality of sensing nodes that are positioned at crossings of the first conductive electrode serials and the second conductive electrode serials.