Resonant Stylus Pen Structure for Hover and Pressure Detection
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Solution Overview
Problem
Existing stylus pens face challenges in accurately distinguishing hover, contact, and pressure operations due to signal attenuation and require additional components like EMR sensors, leading to increased thickness and cost, while passive pens struggle with precision and active pens are expensive and require batteries.
Innovation Solution
A stylus pen design that utilizes an inner empty space to miniaturize the device and includes a housing with a core, inductor unit, capacitor unit, movable bracket, and magnetic body, where the movement of the core changes the resonance frequency through capacitance and inductance to enhance signal transmission and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EMR method is used to improve writing and drawing quality, then writing quality is improved, but thickness increases and cost increases due to additional EMR sensor panel and driving IC
Solution Approach 1:
The patent combines the EMR sensor functionality with the existing touch sensor layer, eliminating the need for a separate EMR sensor panel. The touch sensor panel is configured to detect both touch events and EMR signals simultaneously, merging multiple functions into a single component structure.
Solution Approach 2:
The touch sensor panel is designed to serve multiple functions: detecting light touch events, detecting hover events, and detecting pressure events. This multi-functionality eliminates the need for separate specialized sensors, reducing overall thickness while maintaining precise writing quality.
2Measurement precision
If EMR method is used to improve writing and drawing quality, then writing quality is improved, but cost increases due to additional EMR sensor panel and driving IC
Solution Approach 1:
The patent merges the EMR sensing capability into the existing touch sensor panel structure, eliminating the need for separate EMR sensor panels and driving ICs. This integration reduces component count and manufacturing complexity, thereby lowering costs while maintaining writing quality.
Solution Approach 2:
The touch sensor panel is designed to perform multiple sensing functions (light touch, hover, pressure) using a single device structure, eliminating the need for multiple specialized components and reducing overall system cost.
3Ease of manufacture
If passive stylus pen is used to reduce cost, then cost is reduced, but ability to recognize precise touch deteriorates
Solution Approach 1:
The patent implements dynamic resonance frequency adjustment by moving the core within the coil based on detected touch events. This dynamic adjustment optimizes signal transmission for different touch states (hover, light touch, pressure), enabling precise touch recognition in passive stylus pens without requiring expensive active components.
Solution Approach 2:
The patent changes the resonance frequency parameter dynamically by adjusting the core position in the coil. This parameter adjustment optimizes the LC resonance circuit performance for different touch conditions, enabling precise touch recognition while maintaining passive stylus pen cost effectiveness.
4Measurement precision
If core moves to change resonance frequency, then ability to distinguish hover and contact improves, but device complexity increases
Solution Approach 1:
The patent combines the resonance frequency adjustment mechanism with the existing touch sensor control circuitry. The same controller that manages touch events also controls the core movement and interprets resonance frequency changes, merging multiple functions into existing components and minimizing additional complexity.
Solution Approach 2:
The system uses the touch sensor panel's existing signal processing capabilities to detect core position and adjust resonance frequency automatically. The controller self-manages the resonance optimization without requiring separate dedicated control circuits, reducing overall device complexity.
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 design improves the pen's ability to distinguish hover and contact states at low reference pressures, reduces volume, and stabilizes signal transmission, enhancing usability and portability without additional costs.
Implementation Method 1
an inductor unit (1200) disposed in the housing; a capacitor unit (2100) disposed in the housing to form a resonance circuit with the inductor unit
Implementation Method 2
a core (1020) having one end disposed outside the housing (1010) and the rest portion except for the one end disposed in the housing and moved along a longitudinal direction by an external force applied to the one end
Data Source
AI summary
Disclosed is a stylus pen and a method for manufacturing the same, and to a stylus pen that is miniaturized by using an inner empty space thereof to reduce an inner volume. A stylus pen in which a resonance frequency of a resonance circuit may be changed according to a movement of a core. A stylus pen includes a housing, a core having one end disposed outside the housing and the rest portion disposed in the housing and moved along a longitudinal direction by an external force applied to the one end, an inductor unit disposed in the housing, a capacitor unit disposed in the housing to form a resonance circuit with the inductor unit, a movable bracket disposed in the housing and disposed at the other end of the core to operate in conjunction with the core, and a magnetic body disposed in the movable bracket.