Touch Screen Panel Outer Wire Routing for Coupling Interference
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Solution Overview
Problem
Existing touch screen panels face challenges in reducing coupling interference between touch input signals, particularly when the touch recognition area has non-parallel boundaries, leading to deteriorated touch sensitivity and increased bezel size due to inefficient wire arrangements.
Innovation Solution
The touch screen panel design includes a touch recognition area divided into multiple areas based on reference lines passing through the weight center, with outer wires connecting the touch electrodes and driving unit in a way that minimizes adjacency between different types of outer wires, allowing for efficient electrical connection and reduced coupling interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outer wires are arranged to connect touch electrodes and driving unit in conventional manner, then electrical connection is established, but coupling interference between touch input signals increases and touch sensitivity deteriorates
Solution Approach 1:
The touch recognition area is divided into multiple areas (first to fourth areas) based on reference lines passing through the weight center. Outer wires connecting first outermost touch electrodes and second outermost touch electrodes are alternately disposed in these divided areas, segmenting the wire arrangement to reduce coupling interference between adjacent wires of different types.
Solution Approach 2:
The boundaries of the touch recognition area are configured to be non-parallel to the reference lines, creating an asymmetric arrangement. The outer wires are connected to the driving unit at positions adjacent to specific areas (first and second areas), establishing an asymmetric connection pattern that minimizes interference while maintaining electrical functionality.
2Adaptability or versatility
If touch recognition area uses non-rectangular forms (circular, oval, rhombic), then adaptability to various forms is improved, but wire arrangement efficiency decreases leading to increased bezel size
Solution Approach 1:
The reference line division method and outer wire arrangement strategy are designed to be universally applicable to various touch recognition area forms including circular, oval, rhombic, and rectangular shapes. The same principle of dividing areas based on reference lines and alternately disposing outer wires in divided areas maintains wire arrangement efficiency across different geometric configurations.
Solution Approach 2:
The outer wires are specifically connected to the driving unit at localized positions adjacent to the first and second areas, rather than uniformly distributed. This localized connection approach optimizes wire routing for non-rectangular forms, reducing the overall bezel size while maintaining adaptability to various shapes.
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 minimizes coupling interference and reduces bezel size by alternately disposing outer wires in the touch recognition area, enhancing touch sensitivity and adaptability to various forms such as circular, oval, or rhombic shapes.
Implementation Method 1
A capacitive touch screen panel converts a contact position into electrical signals by detecting a change in capacitance, which is caused by a conductive touch electrode and another adjacent touch electrode or a ground electrode
Data Source
AI summary
A touch screen panel includes a touch recognition area that recognizes a touch input and a non-recognition area that does not recognize the touch input. The touch recognition area includes first touch electrodes connected in a first direction and second touch electrodes connected in a second direction orthogonal to the first direction. The non-recognition area includes a driver that obtains coordinate information of the touch input by using the first and second touch electrodes and outer wires connecting the first and second touch electrodes and the driver.