Touch Module Shielding Layer for Narrow Border Design
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Solution Overview
Problem
Conventional touch devices face challenges in achieving a narrow border design due to the need to prevent electrical interference between upper and lower circuit layers, which increases the width of the non-sensing area and blocking layer.
Innovation Solution
A touch module design that includes a shielding layer between the first and second circuit layers in the non-sensing area, allowing them to overlap without causing electrical interference, while using a blocking layer to conceal the circuit and shielding layers, thereby reducing the overall width of the non-sensing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper circuit layer and lower circuit layer are not overlapped to prevent electrical interference, then electrical interference is avoided, but the total width of the circuit layers increases, causing the non-sensing area and blocking layer width to increase
Solution Approach 1:
The patent introduces a shielding layer as an intermediary component positioned between the upper circuit layer and lower circuit layer. This shielding layer acts as a mediator that blocks electrical interference between the two circuit layers, allowing them to be overlapped vertically. The shielding layer is connected to ground potential, creating an electromagnetic shield that prevents signal interference while enabling the circuit layers to occupy the same horizontal space, thus reducing the non-sensing area width.
2Length of stationary object
If the upper circuit layer and lower circuit layer are overlapped to reduce total width, then the non-sensing area width is reduced, but serious electrical interference is caused between the circuit layers
Solution Approach 1:
The shielding layer serves as a ground-connected intermediary that electromagnetically isolates the upper and lower circuit layers when they are overlapped. By positioning the shielding layer between the two circuit layers and connecting it to ground, the patent creates an electromagnetic barrier that prevents signal interference while allowing the circuit layers to share the same horizontal footprint, thus achieving narrow border design without sacrificing electrical reliability.
3Reliability
If the blocking layer width is increased to accommodate non-overlapped circuit layers, then electrical interference is prevented, but the border width of the touch device increases
Solution Approach 1:
The shielding layer acts as a ground-connected electromagnetic barrier positioned between the upper and lower circuit layers in the non-sensing area. This intermediary structure enables the circuit layers to be overlapped vertically without causing electrical interference, thereby reducing the required width of the blocking layer and achieving a narrower device border while maintaining electrical reliability.
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 enables a narrower border in touch devices by allowing the circuit layers to overlap without interference, increasing the size of the sensing area and meeting the trend of narrow border designs.
Implementation Method 1
The shielding layer is disposed in the non-sensing area and located between the first circuit layer and the second circuit layer
Data Source
AI summary
A touch module having a sensing area and a non-sensing area is provided. The touch module includes a cover covering the sensing and non-sensing areas, a first and a second sensing electrode layers disposed in the sensing area, a first and a second circuit layers disposed in the non-sensing area, a shielding layer, and a blocking layer. The first and second circuit layers are electrically connected to the first and second sensing electrode layers respectively. The first and second circuit layers at least partially overlap each other along a direction perpendicular to a surface of the cover. The shielding layer is disposed in the non-sensing area and between the first and second circuit layers. The blocking layer is disposed on aforementioned surface and in the non-sensing area. The blocking layer at least partially overlaps the first circuit layer, the second circuit layer, and the shielding layer along aforementioned direction.