Touch Sensing Structure Recessed Border Area FPC Juxtaposition
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Solution Overview
Problem
The existing touch sensing structures have a significant border area that limits screen space, as it is required to conceal wiring and other elements, thereby reducing the usable area for user interaction.
Innovation Solution
A touch sensing structure with a recessed border area where a main flexible printed circuit and a touch flexible printed circuit are laterally juxtaposed, allowing the touch sensing unit to be partially exposed and connected to driving elements, thereby reducing the border width and increasing the screen area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a border area is used to conceal wiring and elements, then the wiring and elements are hidden, but the screen space available for user interaction is reduced
Solution Approach 1:
The patent transitions from a planar arrangement of FPCs to a three-dimensional configuration by forming a recess in the second substrate. This allows the FPCs to be positioned in different vertical levels, enabling them to be laterally juxtaposed without increasing the border area width, thus preserving screen space while maintaining wiring concealment.
Solution Approach 2:
The FPCs are nested within the recess structure of the second substrate. The recess accommodates the FPCs by forming a cavity in the substrate, allowing the wiring elements to be hidden within this nested structure rather than requiring additional border space for concealment.
2Area of stationary object
If the border area is minimized to increase screen space, then the screen area is maximized, but the wiring and elements become exposed
Solution Approach 1:
By utilizing the vertical dimension through the recess structure, the patent achieves both minimal border area and effective wiring concealment. The FPCs are positioned within the recess, allowing them to be hidden from external view while occupying minimal lateral space, thus maximizing screen area.
Solution Approach 2:
The recess in the second substrate acts as an intermediary structure that facilitates both objectives: it provides a hiding place for the FPCs to maintain concealment while simultaneously allowing the border area to be minimized to maximize screen space.
3Reliability
If FPCs are positioned to connect driving elements, then electrical connection is achieved, but the border area width increases
Solution Approach 1:
The patent uses the vertical dimension by forming a recess in the second substrate to position the FPCs. This allows the FPCs to be laterally juxtaposed close to the driving elements while maintaining adequate connection length, thus achieving reliable electrical connection without increasing the border area width.
Solution Approach 2:
The FPCs are nested within the recess structure, allowing them to be positioned optimally for electrical connection to the driving elements while the recess itself provides the necessary space for connection without expanding the overall border area.
Data Source
AI summary
A touch sensing structure including a central area and a border area, including: a display panel, including: first substrate; and a second substrate opposite to the first substrate, wherein the second substrate comprises in the border area a recess that partially exposes the first substrate; a main flexible printed circuit (FPC) and a touch flexible printed circuit (FPC) laterally juxtaposed in the border area, wherein the main FPC is bonded to an exposed portion of the first substrate and electrically connected to a first driving element, wherein the touch FPC is bonded to the second substrate and electrically connected to a second driving element; and a touch sensing unit disposed on the second substrate and electrically connected to the touch FPC.