Touch Sensor Diagonal Electrode Lines Reduce Bezel Width
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Solution Overview
Problem
Mutual capacitive type touch sensors in display devices have a wide peripheral area due to signal lines in non-sensing regions, which increases the size of electronic circuitry and limits space for other components in devices like mobile phones and tablets.
Innovation Solution
The design includes first touch electrode lines extending in one direction and second touch electrode lines sloped diagonally, with pad signal lines positioned on one side of the peripheral area, reducing the number of signal lines and thus minimizing the peripheral area width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are positioned in non-sensing regions for mutual capacitive type touch sensors, then the touch sensing function is achieved, but the width of peripheral areas increases
Solution Approach 1:
The patent applies dimensionality change by positioning pad signal lines in the thickness direction (Z-axis) rather than only in the planar peripheral area. The first and second pad signal lines are disposed at different positions in the thickness direction, allowing them to connect to touch electrode lines while minimizing the width of peripheral areas in the plane of the substrate.
Solution Approach 2:
The patent segments the signal transmission function by separating first pad signal lines and second pad signal lines into different spatial locations, specifically at different positions in the thickness direction. This segmentation allows each signal line to be optimally positioned without requiring large peripheral areas, as they can extend vertically through the touch panel structure.
2Ease of manufacture
If signal lines are positioned in non-sensing regions, then touch electrode connections are established, but the size of electronic circuitry increases
Solution Approach 1:
The patent utilizes the thickness direction to position pad signal lines, allowing electronic circuitry to be compact in the planar dimensions while maintaining proper connections. By extending signal lines vertically through different layers rather than horizontally across large peripheral areas, the overall volume of electronic circuitry is reduced.
3Reliability
If signal lines are positioned in non-sensing regions, then touch sensor functionality is achieved, but valuable space for other components is limited
Solution Approach 1:
The patent resolves the space limitation by positioning pad signal lines in the thickness direction at different Z-axis positions, rather than consuming valuable planar space. This allows the touch sensor to maintain full functionality while preserving maximum area on the substrate for other electronic components and display elements.
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 reduces the bezel width of the touch panel, allowing for more compact electronic circuitry and valuable space in devices, enhancing portability and design flexibility.
Implementation Method 1
A touch electrode may form a sensing capacitor together with another touch electrode (mutual-capacitor type) or form a sensing capacitor together with an external object (self-capacitor type). When a conductor, such as a finger, approaches a touch sensor or comes into contact with the touch sensor, capacitance of the sensing capacitor or a charged quantity of electric charge is changed to recognize whether a contact has been made and a contact position
Implementation Method 2
When a conductor, such as a finger, approaches a touch sensor or comes into contact with the touch sensor, capacitance of the sensing capacitor or a charged quantity of electric charge is changed
Data Source
AI summary
A touch sensor including first touch electrode lines extending in one direction and second touch electrode lines extending in a diagonal direction sloped with respect to the first touch electrode lines. A first touch electrode line intersects a second touch electrode line.