Touch Panel Side Touch Detection Without Bezel Expansion
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Solution Overview
Problem
Conventional touch panels struggle to accurately detect side touch operations without increasing the bezel width due to the limitations of self-capacitive sensing and the need for additional metal lines, which complicates determining touch coordinates and widens the bezel.
Innovation Solution
A touch panel design featuring a substrate with a plane portion and bending portions, incorporating a plane touch module for sensing plane touch signals and a side touch module for sensing side touch signals, where touch signal lines are multiplexed to avoid additional peripheral lines, enabling accurate side touch detection without increasing the bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional metal lines are added to detect side touch operations, then side touch detection capability is improved, but bezel width increases
Solution Approach 1:
The touch signal lines are designed to serve dual purposes: detecting touch operations on both the plane portion and the bending portion (side surface). By making the touch signal lines multi-functional, the patent eliminates the need for additional dedicated metal lines for side touch detection, thereby maintaining a narrow bezel width while achieving comprehensive touch detection capability across different surfaces.
2Adaptability or versatility
If self-capacitive sensing is used for side touch detection, then detection capability is improved, but manufacturing complexity increases due to additional metal lines
Solution Approach 1:
The existing touch signal lines are designed to function for both plane touch and side touch detection, eliminating the need for additional dedicated metal lines. This multi-functional design simplifies the manufacturing process by reducing the number of components and assembly steps required, while still achieving comprehensive touch detection capability.
Solution Approach 2:
The patent combines the plane touch detection and side touch detection functions into a single integrated system using shared touch signal lines. By merging these functions, the patent reduces device complexity and manufacturing complexity, as there is no need to manufacture and assemble separate dedicated lines for side touch detection.
3Ease of manufacture
If touch electrodes are located only at the same plane, then manufacturing simplicity is maintained, but side touch operation detection is lost
Solution Approach 1:
The patent extends touch detection from a two-dimensional plane to a three-dimensional structure by incorporating the bending portion (side surface) into the touch detection area. The touch signal lines are designed to follow the substrate's bending, enabling detection on both the plane portion and the side surface, thus adding a spatial dimension to touch interaction while maintaining manufacturing simplicity through the use of existing line structures.
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 allows for accurate detection of touch operations at different planes without increasing the bezel width, utilizing a mutually-capacitive mode to determine touch coordinates and transmit signals efficiently through shared touch signal lines.
Implementation Method 1
A part of touch signal lines of the plane touch module are multiplexed as touch signal lines of the side touch module
Data Source
AI summary
A touch panel, a method for manufacturing the same and a display device are disclosed. The touch panel includes: a substrate including a plane portion and at least one bending portion extending from an edge of the plane portion and bent to form a side of the plane portion; a plane touch module arranged at the plane portion and configured to sense a plane touch signal generated at the plane portion; and a side touch module arranged at the bending portion and configured to sense a side touch signal generated at the bending portion. A part of touch signal lines of the plane touch module are multiplexed as touch signal lines of the side touch module.