Capacitive Stylus Tip for Pressure and Angle Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch screen styluses lack the ability to easily select parameters such as line width, style, or color, and do not provide the level of artistic control offered by traditional drawing tools like pencils, limiting user interaction with touch screens.
Innovation Solution
A touch screen stylus with a movable tip and capacitive sensors that detect changes in distance and pressure, allowing for real-time control of line width, color, and other visual parameters by analyzing movements and forces applied to the stylus, and providing haptic feedback to simulate drawing on paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional stylus is used, then the device structure remains simple, but the user cannot easily select parameters such as line width, color, or style
Solution Approach 1:
The patent implements a movable tip mechanism that allows the stylus tip to shift position within the body in response to applied pressure. This dynamic structure enables the capacitive sensors to detect different positions and pressures, providing multiple control parameters (line width, color, style) without requiring multiple physical buttons or switches, thus increasing versatility while maintaining relatively simple structure
Solution Approach 2:
The patent changes the physical state and position of the tip relative to the capacitive sensors. By varying the tip's position and the pressure applied, the system detects different capacitance values and translates them into different drawing parameters (line width, color, style), enabling parameter selection through physical interaction rather than electronic controls
2Ease of operation
If pressure sensing is added to control line width, then artistic control is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical pressure sensing mechanisms with capacitive sensing. The movable tip and capacitive sensor combination uses electrical field detection rather than mechanical springs or levers, providing pressure sensitivity with simpler and more integrated components, thus improving ease of operation while minimizing the increase in device complexity
3Measurement precision
If multiple capacitive sensors are used to detect tip movements, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the capacitive sensing function into multiple discrete sensors positioned at different locations within the stylus body. Each sensor detects the position of the movable tip from its specific viewpoint, and the combination of these segmented measurements provides precise three-dimensional position and pressure detection, improving measurement precision while keeping each individual sensor simple
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 users to easily select and control line width, color, and other parameters, enhancing artistic control and user interaction with touch screens by translating stylus movements and pressures into corresponding visual effects on the screen.
Implementation Method 1
The amount of displacement may be determined by an absolute shift in capacitance of the applicable sensor
Implementation Method 2
The angle of the stylus relative to the touch screen surface may be determined by the relative shift in the capacitive sensors around the wall of the stylus
Data Source
AI summary
A handheld stylus for use with a display device may include a handheld body, a tip movably coupled to the body, and at least one capacitive sensor configured to detect movements of the tip relative to the body. The at least one capacitive sensor may comprise at least one first conductive element secured to or integral with the body, and at least one second conductive element secured to or integral with the movable tip. The tip may be arranged such that the at least one first conductive element and the at least one second conductive element are spaced apart from each other. The at least one capacitive sensor may be configured to detect changes in respective distances between the at least one first conductive element and the at least one second conductive element caused by movements of the tip relative to the body.