Active Stylus Perpendicular Circuit Board Connection
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Solution Overview
Problem
Existing active styluses face challenges in signal transmission due to the limitations of wire connections between touch sensing elements and main circuit boards, which hinder the assembly process and lead to structural weaknesses.
Innovation Solution
The active stylus employs a novel electrical connection structure where a second circuit board, perpendicular to the first circuit board, supports the touch sensing element, allowing for smooth board-to-board electrical connections and enhanced structural strength through the use of pads on opposing surfaces for welding, facilitating the transmission of a large amount of information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wire connection is used between the touch sensing element and the main circuit board, then the assembly is simpler, but the signal transmission capacity is insufficient and the structural strength is weak
Solution Approach 1:
The patent extracts the connection function from a single wire and distributes it across multiple pads on circuit boards. The wire connection is replaced by direct pad-to-pad electrical connections between the first circuit board and second circuit board, eliminating the need for intermediate wiring while increasing signal capacity through multiple parallel connection points.
Solution Approach 2:
The patent transitions from a one-dimensional wire connection to a two-dimensional pad array connection. Multiple pads are arranged on opposing surfaces of the first and second circuit boards, creating a planar connection interface that provides both mechanical strength and high signal transmission capacity through parallel conductive paths.
2Device complexity
If a wire connection is used between the touch sensing element and the main circuit board, then the device complexity is reduced, but the assembly and welding become difficult and easily damaged
Solution Approach 1:
The patent merges the electrical connection function and mechanical support function into a single integrated structure. The pads on the circuit boards serve dual purposes: providing electrical connectivity and providing mechanical strength to support the touch sensing element, eliminating the need for separate wire connections and reducing assembly complexity.
Solution Approach 2:
The circuit boards are designed with pre-positioned pads in specific arrangements on their surfaces. This preliminary design of the connection interface allows for straightforward alignment and assembly, as the pads are already in their final positions and orientations, eliminating complex wiring assembly steps.
3Loss of information
If more information needs to be transmitted, then the signal transmission requirement increases, but the wire cannot meet the transmission requirement
Solution Approach 1:
The patent segments the single wire connection into multiple discrete pad connections. Each pad provides an independent electrical pathway, allowing multiple signals to be transmitted simultaneously through parallel connections. This segmentation enables the system to handle increased information transmission requirements by utilizing the collective capacity of multiple pads rather than overloading a single wire.
Data Source
AI summary
An active stylus, including a housing, a pen core, a first circuit board, and a touch sensing module, is provided. The pen core, the first circuit board, and the touch sensing module are disposed in the housing. The touch sensing module includes a touch sensing element and a second circuit board. The touch sensing element is disposed on and electrically connected to the second circuit board. The second circuit board is electrically connected to the first circuit board and is abutted to a lateral surface of the first circuit board. The second circuit board is perpendicular to the first circuit board. The pen core is abutted to the touch sensing element.