Touch Electrode Pattern Layout for Stable Stylus Voltage Sensing
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Solution Overview
Problem
Existing touch input devices experience variations in output voltage based on the position of a stylus pen, affecting the accuracy of touch and stylus detection.
Innovation Solution
A touch input device with a sensor unit comprising multiple patterns of electrodes, including first, second, third, and fourth patterns, connected in specific configurations to control touch and stylus sensing modes, stabilizing output voltage and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a typical flexible display panel with metal mesh touch sensor is used, then the device can detect touch input, but the output voltage of the sensing circuit varies according to the position of the stylus pen
Solution Approach 1:
The sensor unit is divided into multiple independent patterns (first pattern, second pattern, third pattern, fourth pattern) arranged in specific configurations. Each pattern can be independently controlled and sensed, allowing the system to compensate for position variations by selecting appropriate patterns based on the stylus position, thereby maintaining stable output voltage while preserving detection accuracy
Solution Approach 2:
Different patterns are designed with different electrical connections and sensing characteristics tailored to their specific locations and functions. The first and second patterns have one end connected to the sensing circuit while the other end is opened, while the third and fourth patterns have both ends connected to the sensing circuit, creating local variations in electrical properties to compensate for position-dependent voltage changes
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 device effectively detects touch positions and stylus pen positions with reduced voltage variation, improving sensing accuracy and stability across different modes.
Implementation Method 1
a capacitor C is approximately 250 pF. Based on ten distributed models, at a driving frequency of 300 kHz, an impedance of the capacitor is approximately 200 times greater than a resistance thereof
Data Source
AI summary
The present invention relates to a multifunctional touch input device capable of detecting a touch position, driving a stylus pen, and detecting a position of the stylus pen. The touch input device includes a sensor unit and a control unit, the sensor unit including a plurality of patterns. The plurality of patterns include a first pattern extending in a first direction, a second pattern disposed adjacent to the first pattern, a third pattern extending in a second direction different from the first direction, and a fourth pattern disposed adjacent to the third pattern. Here, the plurality of first third patterns have one ends electrically connected to the control unit and the other ends electrically opened. The plurality of first patterns have the other ends that are electrically connected to each other, and the plurality of third patterns have the other ends that are electrically connected to each other.