Touch Pen Tilt Detection via Capacitance Variation
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Solution Overview
Problem
Conventional touch pens fail to provide an enhanced user experience, particularly in applications requiring high sensitivity, such as painting, as they rely solely on pressure-sensitive responses which are inadequate for meeting user demands.
Innovation Solution
A touch pen with a capacitor circuit that varies capacitance values based on tilt angles, incorporating a detection circuit to generate capacitance information and a signal generating circuit to produce corresponding driving signals, allowing for improved control over touch screens through adjustable line thickness and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch pens use only pressure-sensitive responses, then the device complexity is low, but the measurement precision and user experience are insufficient
Solution Approach 1:
The patent changes the physical parameter being measured from only pressure to include both pressure and tilt angle. The capacitor circuit detects capacitance variations caused by tilt angle changes, while the pressure-sensitive rubber detects pressure. This multi-parameter detection approach improves measurement precision without significantly increasing device complexity.
Solution Approach 2:
The touch pen is designed to perform multiple functions: detecting both pressure and tilt angle, and controlling multiple screen parameters (line thickness, brightness, color temperature). This multi-functionality approach allows a single device to provide enhanced user experience across different application scenarios.
2Adaptability or versatility
If the touch pen includes capacitor circuit, detection circuit, and signal generating circuit, then the measurement precision and control capability are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple detection functions into a unified capacitor circuit that detects both pressure and tilt angle through capacitance variations. The detection circuit and signal generating circuit process these variations to control multiple screen parameters simultaneously, achieving functional integration that improves adaptability while managing device complexity.
Solution Approach 2:
The capacitor circuit acts as an intermediary that translates physical tilt angle into detectable capacitance variations. This intermediary mechanism enables the detection circuit to indirectly measure tilt angle without requiring direct mechanical sensors, thus improving control capability while keeping the device structure relatively simple.
3Measurement precision
If the touch pen uses fluid to apply forces to the second electrode, then the measurement precision for tilt angle is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses fluid (hydraulic principle) to apply forces to the second electrode based on tilt angle. The fluid pressure changes with tilt angle, causing the elastic member to deform and move the second electrode, which changes the capacitance. This hydraulic approach improves tilt angle detection precision while avoiding complex mechanical linkage systems.
Solution Approach 2:
The patent changes the state of the fluid (pressure) in response to tilt angle changes. This parameter change in fluid pressure directly translates tilt angle into measurable capacitance variations, improving measurement precision while maintaining relatively simple manufacturing through the use of common hydraulic principles.
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 touch pen enhances writing experience by enabling precise control over touch screens, offering a simple structure, fast response, reduced power consumption, and easy implementation, while meeting high application requirements.
Implementation Method 1
a capacitor circuit, wherein the capacitor circuit has different capacitance values when the touch pen is at different tilt angles
Implementation Method 2
an elastic member, provided between the first electrode and the second electrode
Implementation Method 3
a fluid, provided on a side of the second electrode away from the pen tip, and used to apply different forces to the second electrode when the touch pen is at different tilt angles
Data Source
AI summary
A touch pen, a driving method thereof, and a touch system are provided. The touch pen includes: a capacitance circuit having different capacitance values when the touch pen is at different tilt angles; a detection circuit configured to detect a capacitance value of the capacitance circuit and generate capacitance information corresponding to the capacitance value; and a signal generating circuit configured to generate a corresponding driving signal according to the capacitance information.