Touch Sensing Device Bending Area Reducing Light Shielding
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Solution Overview
Problem
The challenge is to minimize the light shielding area in display devices while incorporating touch sensing functionality, as the pad portion and touch circuit board on the display panel are difficult to conceal, affecting visibility.
Innovation Solution
A touch sensing device with a base layer, touch electrode layer, and reinforcing members is designed, featuring protruding areas that can be bent to overlap the display panel, allowing the touch circuit board to be securely attached and reducing the light shielding area by positioning the bending areas adjacent to a neutral plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device uses a conventional flat structure with pad portion and touch circuit board disposed on the display panel, then the touch sensing functionality is achieved, but the light shielding area increases and visibility is reduced
Solution Approach 1:
The touch sensing device is divided into a bending area and a pad area. The bending area is bent downward to overlap with the display panel, while the pad area remains extended to receive the touch circuit board. This segmentation allows the device to reduce light shielding area while maintaining functionality.
Solution Approach 2:
The pad portion is transitioned from a two-dimensional flat layout on the display panel to a three-dimensional configuration where the bending area overlaps the display panel in a bent state. This dimensional change conceals the pad portion and reduces the light shielding area.
2Area of stationary object
If the pad portion is bent to reduce visibility impact, then the light shielding area is reduced, but the structural stability and electrical connection may be compromised
Solution Approach 1:
The reinforcing member is disposed on the pad area before the bending process. This preliminary reinforcement ensures that when the bending area is bent downward, the pad area maintains its structural integrity and can reliably receive and electrically connect the touch circuit board.
Solution Approach 2:
The reinforcing member is specifically placed only in the pad area where structural support is needed, while the bending area remains flexible for bending. This localized reinforcement maintains structural stability without compromising the bending functionality.
3Adaptability or versatility
If the touch circuit board is disposed on the display panel surface, then the touch sensing functionality is achieved, but the pad portion becomes visible and increases light shielding area
Solution Approach 1:
The device is segmented into bending area and pad area with distinct functions. The bending area conceals itself by overlapping the display panel, while the pad area is positioned to receive the touch circuit board. This segmentation allows the circuit board to be functionally integrated while visually concealed.
Solution Approach 2:
The pad portion is moved from the flat display panel surface to an overlapping position in three-dimensional space. By bending the bending area downward to overlap the display panel, the pad area and touch circuit board are concealed behind the display panel, reducing visible light shielding area.
Data Source
AI summary
A touch sensing device includes a base layer, a touch electrode layer, a first reinforcing member, and a touch circuit board. The base layer includes a main area and a protruding area protruding from the main area in a first direction. The touch electrode layer is disposed on a surface of the base layer. The first reinforcing member is disposed on a surface of the protruding area. The touch circuit board is electrically connected to the touch electrode layer. The protruding area includes a bending area and a pad area. The bending area is bent downward. The pad area extends from the bending area in the first direction and overlaps the base layer in a second direction intersecting the first direction in a bent state of the bending area. The touch circuit board is attached to the pad area.