Stylus Touch Resonance Driving for Faster Coordinate Detection
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Solution Overview
Problem
Existing touch apparatuses struggle to accurately detect and process signals for touch coordinates and determine the type of a touch object, particularly when using a stylus pen, with suboptimal performance and signal-to-noise ratio.
Innovation Solution
A touch apparatus and method that utilizes a resonance driving mode to generate a resonance signal with a stylus pen, followed by an idle mode to analyze detection signals, enhancing signal processing and object type determination through baseline signal comparison and frequency differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a driving signal is continuously output to the touch sensor, then touch detection can be performed, but signal processing time is insufficient and processing speed is reduced
Solution Approach 1:
The touch controller alternates between a driving mode where driving signals are output to the touch sensor and an idle mode where driving signals are not output. This periodic operation allows sufficient time for signal processing during the idle mode while maintaining touch detection capability during the driving mode, thereby resolving the contradiction between measurement precision and processing speed.
2Measurement precision
If resonance driving mode is used to generate resonance signal, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The touch controller utilizes resonance driving mode that generates resonance signals at specific frequencies (e.g., 400 kHz) to enhance the signal-to-noise ratio during touch detection. By leveraging the natural resonance characteristics of the stylus pen and touch sensor system, the patent improves measurement precision without requiring additional complex hardware components.
3Measurement precision
If driving signal frequency is increased to match resonance frequency, then resonance signal intensity increases, but energy consumption increases
Solution Approach 1:
The touch controller employs periodic driving mode and idle mode operation, where driving signals are output only during the driving mode for predetermined periods. This approach allows the system to use higher energy frequencies during resonance detection when needed, while consuming less energy overall by remaining in idle mode during non-detection periods, thus balancing signal intensity requirements with energy consumption constraints.
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
Improves touch detection performance by increasing resonance signal intensity and signal-to-noise ratio, allowing prompt determination of touch object type and secure sufficient processing time.
Implementation Method 1
a first driving signal is output for generation of a resonance signal of a stylus pen to the touch sensor
Data Source
AI summary
A touch apparatus according to an exemplary embodiment of the present invention includes: a touch sensor; and a touch controller that operates in a resonance driving mode during which a first driving signal is output for generation of a resonance signal of a stylus pen to the touch sensor and an idle mode during which the driving signal output to the touch sensor is stopped, and obtains first touch coordinate information from a detection signal input from the touch sensor during the resonance driving mode.