Touch Input Induction Coil Using Ribbon Cable Bending
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Solution Overview
Problem
Conventional touch panels face challenges in achieving accurate line depiction with varying thicknesses and fine location recognition using fingers, and existing solutions for integrating induction coils with electromagnetic pens are labor-intensive, costly, or increase module thickness.
Innovation Solution
A touch input device featuring an induction coil formed by bending a ribbon cable with specific coupling, allowing for low-cost and simple manufacturing processes, where the ribbon cable with multiple bends and a coupling device creates a single-wire coil to interact with an electromagnetic pen for pressure-sensitive signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual winding of wires around the touch panel is used to form an induction coil, then the induction coil can be formed, but the process is labor-intensive and inconsistent with automated production
Solution Approach 1:
The induction coil is segmented into multiple straight wire segments arranged in parallel within the ribbon cable, rather than requiring continuous manual winding. This segmentation allows for automated assembly while achieving the same functional effect of generating magnetic flux through multiple parallel current paths.
Solution Approach 2:
The wire is pre-formed into a ribbon cable structure with multiple parallel conductors before assembly onto the touch panel. This preliminary preparation of the wire configuration enables automated placement and connection processes, eliminating the need for manual winding during final assembly.
2Ease of manufacture
If the induction coil is arranged on a separate circuit board and then assembled with the touch panel, then the induction coil can be integrated, but the thickness of the entire touch module increases
Solution Approach 1:
The induction coil structure is merged with the touch panel assembly by integrating the ribbon cable directly onto the touch panel surface. The multiple parallel wires are positioned to follow the contours of the touch panel, allowing the induction coil functionality to be combined with the existing touch panel structure rather than adding a separate thick circuit board layer.
Solution Approach 2:
The induction coil is configured to lie substantially in the same plane as the touch panel surface, transitioning from a traditional three-dimensional stacked coil structure to a two-dimensional planar arrangement. This dimensional change allows the induction coil to occupy minimal vertical space while maintaining its functional area.
3Ease of manufacture
If a pattern of the induction coil is coated with transparent metal on the capacitive touch panel substrate, then the induction coil can be integrated, but the design of photomask must be changed which greatly increases cost
Solution Approach 1:
A ribbon cable structure serves as an intermediary component that provides the induction coil functionality without requiring direct photomask patterning on the touch panel substrate. The ribbon cable acts as a pre-fabricated intermediary element that can be assembled onto the touch panel using standard connection techniques, avoiding the need for complex photomask design changes and expensive transparent metal coating processes.
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
The solution enables accurate position and pressure sensing on touch screens with reduced production costs and complexity, overcoming the limitations of prior art by using a flexible ribbon cable and coupling device to form a compact induction coil.
Implementation Method 1
the induction coil, which is disposed around the touch panel, is utilized to interact with the electromagnetic pen for generating a pressure sensitive signal
Data Source
AI summary
An induction coil of a touch input device provided in the present invention includes a ribbon cable and a coupling device. The ribbon cable is disposed on a plane, and the ribbon cable has a first terminal and a second terminal and has a plurality of wires. The ribbon cable defines a sensing region on the plane by a plurality of bends. The coupling device is utilized to couple the wires at the first terminal and the second terminal such that the wires form a circuit with a plurality of turns wound by a single conducting wire. A touch input device is further provided in the present invention.