Foldable Device Stylus Detection via Resonance Calibration
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Solution Overview
Problem
Foldable electronic devices face challenges in accurately recognizing a stylus pen due to variations in resonant frequency caused by differences in electronic device components, leading to a margin of error in input detection, which can result in incorrect pen pressure detection.
Innovation Solution
A foldable electronic device with a sensor panel featuring a plurality of vertical channels and a processor that detects the folding state and transmits/receives deviation detection signals to correct input information using compensation values, ensuring precise stylus pen recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic resonance is used to detect stylus pen magnetic field, then stylus pen location can be identified, but resonance frequency deviations occur due to component variations and magnetic interference
Solution Approach 1:
The patent applies preliminary action by performing frequency calibration before actual stylus detection. The system pre-determines compensation values for resonance frequency deviations caused by component variations and magnetic interference elements. This calibration data is stored and applied during operation to correct detected frequencies, ensuring accurate stylus location identification despite inherent frequency shifts in the electromagnetic resonance system.
2Adaptability or versatility
If sensor panel channels are increased to improve detection coverage, then stylus input detection capability is enhanced, but device complexity increases
Solution Approach 1:
The patent implements universality by designing sensor panel channels that serve multiple functions. The same vertical and horizontal channels used for stylus location detection are also employed for frequency calibration and compensation. This multi-functional approach allows comprehensive stylus detection coverage without proportionally increasing device complexity, as the existing channel infrastructure is leveraged for both detection and calibration purposes.
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 solution provides standardized usage and improved product satisfaction by accurately correcting input information and maintaining precise pen pressure detection across varying device characteristics.
Implementation Method 1
The electronic device may detect a magnetic field generated from a stylus pen by using electro magnetic resonance (hereinafter referred to as "EMR"). The electronic device may identify a location of the stylus pen based on the induced electromotive force generated by the magnetic field for each channel.
Implementation Method 2
The electronic device may identify a location of the stylus pen based on the induced electromotive force generated by the magnetic field for each channel.
Data Source
AI summary
According to certain embodiments, a foldable electronic device comprises: a flexible display; a first housing in which a first region of the flexible display is positioned; a second housing in which a second region of the flexible display is positioned; a hinge structure interposed between the first housing and the second housing and forming a folding axis; a sensor panel interposed between the flexible display and each of the first housing and the second housing, the sensor panel configured to identify input information of a stylus pen, and including a plurality of first vertical channels interposed the first housing and the first region of the flexible display and a plurality of second vertical channels disposed between the second housing and the second region of the flexible display; and a processor configured to control the sensor panel, wherein the processor is configured to: detect whether the foldable electronic device is folded; when the foldable electronic device is folded, transmit a deviation detection signal to at least one of the plurality of first vertical channels and receive the deviation detection signal through at least one of the plurality of second vertical channels; and correct the input information of the stylus pen using a compensation value corresponding to the received deviation detection signal.