Pen Coordinate Scanning for Contact and Hover Signal Detection
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Solution Overview
Problem
Existing touch pads configured for pen input experience degraded coordinate detection accuracy for electrodes in contact and not in contact with the panel surface due to signal spreading, leading to distinct peak loss.
Innovation Solution
A sensor controller performs first and second scanning operations to detect signals from electrodes in contact and not in contact with the panel surface at different reference positions within specific ranges, using a smaller pitch for electrodes under the panel to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor electrodes are arranged closer together under the panel surface to improve coordinate detection accuracy for contacting electrodes, then accuracy of detection for electrodes in contact with the panel surface is improved, but accuracy of detection for electrodes not in contact with the panel surface is degraded
Solution Approach 1:
The patent applies dynamics by making the scanning range adjustable based on the detection target. The controller dynamically switches between a first scanning range for contacting electrodes and a second scanning range for non-contacting electrodes, optimizing detection accuracy for each case without being constrained by a fixed electrode arrangement
Solution Approach 2:
The patent changes the scanning range parameter according to the detection target. By expanding the scanning range to a second range greater than the first range when detecting non-contacting electrodes, the system captures spread signals more effectively, resolving the contradiction between close electrode spacing and signal capture range
2Measurement precision
If sensor electrodes are arranged closer together to enhance detection precision, then coordinate detection accuracy is improved, but signal spreading causes loss of distinct peaks
Solution Approach 1:
The system dynamically adjusts the scanning range based on whether the target electrode is contacting or non-contacting. For non-contacting electrodes where signal spreading occurs, the second scanning range captures the dispersed signal more effectively, preventing information loss while maintaining detection precision
Solution Approach 2:
By changing the scanning range parameter from the first range to the second range when detecting non-contacting electrodes, the system adapts to signal spreading conditions. This parameter change allows the detection system to capture broader signal distributions without losing peak information
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 the accuracy of detecting coordinates of electrodes in contact and not in contact with the panel surface by capturing position signals in a larger range, thereby enhancing overall coordinate detection precision.
Implementation Method 1
a sensor controller for detecting coordinates of a pen including one or more electrodes configured to transmit a signal
Data Source
AI summary
A method performed by a sensor controller detects coordinates of a pen including one or more electrodes that transmit a signal. The method includes a first scanning step of performing an operation of detecting a signal transmitted from an electrode in contact with a panel surface at each of three or more first reference positions at which signal levels can be detected, from the signal detected in a sensor electrode group included in a first range, among plural juxtaposed reference positions. The method includes a second scanning step of performing an operation of detecting a signal transmitted from an electrode not in contact with the panel surface at each of three or more second reference positions at which signal levels can be detected, from the signal detected in a sensor electrode group included in a second range greater than the first range, among the plural reference positions.