Narrow Border Touch Panel via Perpendicular Bonding Surface
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Solution Overview
Problem
Conventional touch panels face challenges in reducing the border dimension due to the expansion of the shielding layer, which affects the effective reduction of the sensing device's border dimension.
Innovation Solution
The touch panel design features a substrate with a main plane and a non-active region, where the bonding surface of the flexible printed circuit board is not parallel to the main plane, allowing connecting lines to be located in the non-active region, and a flexible transparent film that connects to both planes, reducing the bonding region and thus the border dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is used to shield the peripheral circuit and bonding region, then electromagnetic interference is reduced, but the border dimension of the sensing device increases
Solution Approach 1:
The patent moves the bonding region from the main plane (2D surface) to the side surface (3D vertical dimension) of the substrate. By making the bonding surface perpendicular to the main plane, the connecting lines are routed vertically along the side surface rather than horizontally across the main plane, effectively removing the bonding region from the 2D border dimension while maintaining electromagnetic shielding on the main plane.
2Reliability
If the bonding region is expanded to accommodate the flexible printed circuit board connection, then electrical connection is improved, but the border dimension of the sensing device increases
Solution Approach 1:
The bonding surface is positioned on the side surface of the substrate perpendicular to the main plane, transferring the electrical connection function from the 2D main plane to the 3D vertical dimension. This allows the flexible printed circuit board to connect to the sensing device through the side surface, eliminating the need for horizontal bonding regions that would increase the border dimension.
3Length of stationary object
If the shielding layer range is reduced to achieve narrow border, then border dimension is reduced, but electromagnetic shielding effectiveness is compromised
Solution Approach 1:
The patent maintains effective electromagnetic shielding on the main plane by positioning the bonding region on the perpendicular side surface. This spatial separation ensures that the shielding layer on the main plane does not need to extend into the border area, as the bonding region is located in a different dimensional plane, thus achieving narrow border while maintaining shielding effectiveness.
Solution Approach 2:
The patent segments the substrate into distinct functional regions: the main plane for sensing and shielding functions, and the side surface for bonding and electrical connection functions. This segmentation allows the shielding layer to be confined to the main plane without needing to extend to the border area, achieving both narrow border and effective shielding.
Data Source
AI summary
A touch panel includes a substrate, a flexible printed circuit board and a sensing device. The substrate includes a main plane having an active region and a non-active region surrounding the active region. The flexible printed circuit board has a bonding surface, wherein the bonding surface and the main plane are not parallel to each other. The sensing device includes a plurality of electrode patterns located in the active region and a plurality of connecting lines respectively connected between the electrode patterns and the flexible printed circuit board so as to electrically connect the electrode patterns and the flexible printed circuit board, wherein at least a part of the connecting lines is located in the non-active region, and the connecting lines are connected to the bonding surface of the flexible printed circuit board.