Stylus Pen Segmented Capacitor Circuit for Hover Signal Reception
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Solution Overview
Problem
Existing stylus pens and touch screens face challenges in efficiently transmitting and receiving magnetic signals due to the thickness and fragility of digitizer components, which hinder the development of thinner and more flexible electronic devices.
Innovation Solution
A stylus pen design incorporating an inductor unit, a capacitor unit with parallel capacitors, a connection member, a movable member, and a conductive elastic member, allowing for efficient signal transmission and reception through a resonant electromagnetic interaction with touch screens, even in hovering states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional digitizer components are used for magnetic signal transmission, then signal transmission can be achieved, but the device thickness increases and flexibility is reduced
Solution Approach 1:
The capacitor unit is divided into multiple first capacitors connected in parallel, with a movable member that can contact different combinations of these capacitors. This segmentation allows the system to achieve variable capacitance values without requiring a single large capacitor, thereby reducing the thickness of the digitizer component while maintaining signal transmission efficiency.
Solution Approach 2:
The movable member is designed to move relative to the connection member, changing the contact state with different capacitors based on the hovering distance. This dynamic adjustment enables the capacitance value to vary with distance, allowing efficient signal transmission at different gaps without increasing component thickness.
2Ease of manufacture
If conventional rigid capacitor structures are used, then manufacturing is simplified, but durability against repeated folding is reduced
Solution Approach 1:
The capacitor structure uses thin-film technology with flexible connection members and movable members that can bend and deform without breaking. The elastic member provides flexibility while maintaining electrical connection, enabling the device to withstand repeated folding without compromising manufacturing simplicity.
3Device complexity
If a simple capacitor structure is used, then device complexity is reduced, but signal reception efficiency in hovering states is insufficient
Solution Approach 1:
The movable member dynamically adjusts its position relative to the connection member based on the hovering distance, changing which capacitors are activated. This dynamic adaptation allows the system to optimize signal reception efficiency for different hovering states without requiring a complex fixed structure.
Solution Approach 2:
The capacitance value is changed by selectively contacting different capacitors through the movable member's position. This parameter adjustment enables the system to adapt to varying hovering distances, improving signal reception efficiency while maintaining a relatively simple overall structure.
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
Enables efficient magnetic signal transmission and reception, supporting thinner and more flexible electronic devices by reducing the need for bulky digitizer components and enhancing durability against repeated folding.
Implementation Method 1
an inductor unit; and a capacitor unit including a plurality of first capacitors connected to the inductor unit in parallel
Implementation Method 2
efficient signal transmission and reception through a resonant electromagnetic interaction with touch screens
Implementation Method 3
a conductive elastic member connected to the second signal line
Data Source
AI summary
A stylus pen according to an exemplary embodiment includes: an inductor unit; and a capacitor unit including a plurality of first capacitors connected to the inductor unit in parallel, a connection member including a first signal line connected to one end of each of the plurality of first capacitors, a movable member including a second signal line connected to the first signal line when contacting the connection member, a conductive elastic member connected to the second signal line, and a second capacitor connected between the elastic member and the other end of each of the plurality of first capacitors.