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Researchers Submit Patent Application, "Electronic Device for Recognizing Asynchronous Digital Pen and Recognizing Method Thereof", for Approval

July 30, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor RHEE, Bong-Jae (Suwon-si, KR), filed on December 4, 2013, was made available online on July 17, 2014.

The patent's assignee is Samsung Electronics Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "With rapid development of an electronic communication technology, a peripheral device attached to or additionally used for an electronic device also develops. For example, for the peripheral device, there exists an auxiliary memory card, an ear microphone mounted and installed in an electronic device to allow communication with a counterpart user, a Bluetooth headset for performing short distance wireless communication via a Bluetooth module mounted in the electronic device, and a stylus pen which is a kind of a digital pen used to manipulate a touchscreen unit for performing input and output simultaneously.

"Recently, a so-called smartphone is mainly used as a representative electronic device, and the smartphone indispensably has a touchscreen unit performing input/output of data simultaneously using a large-sized screen with consideration of use convenience.

"A touch panel used for the touchscreen unit is roughly classified into various touch panels such as a resistive touch panel, a capacitive touch panel, an ultrasonic touch panel, a light (infrared) sensor type touch panel, a touch panel using an electromagnetic resonance, etc.

"To increase convenience and variety in touch, the electronic device having the above-described various types of touchscreen unit has a stylus pen of a predetermined length, whose end has a pointed tip so that it is detachable from the inside of the electronic device. For example, an electronic device having a resistive touchscreen may have a construction where a stylus pen has a simply pointed end and touches the touchscreen with a predetermined pressure. Also, in a case of a capacitive touch panel, it is preferable that a tip contacting the touchscreen is formed of a conductive material and applied.

"Meanwhile, a method using an electromagnetic resonance requires a sensor pad (referred to as a 'digitizer') arranged in an array configuration for generating electromagnetic resonance at the lower portion of a display screen on which pen input is performed, and detection is possible only within a detect region of the sensor pad.

"However, since this method requires a magnetic material and a coil body inside a pen and requires a flat-shaped sensor pad also inside an electronic device, the structure is complicated and manufacturing costs increase. Also, in the method using an ultrasonic wave, when a pen generates an ultrasonic wave, a time until a receiver provided to an electronic device receives the ultrasonic wave is measured, and a distance between the receiver and the pen is calculated from the propagation velocity of an ultrasonic wave and the time until the ultrasonic wave is received. Therefore, unlike the electromagnetic resonance method, the method using the ultrasonic wave does not require the sensor pad of array configuration and the detect region is relatively wide. The above-described related-art ultrasonic wave method uses a method of measuring distances between two or more receivers and a pen, and calculating the coordinate of the pen using triangle drawing. This method may accurately measure a time until an ultrasonic wave is received only when a receiver knows an accurate point at which the pen generates the ultrasonic wave. Therefore, there is a need for a more reasonable measurement method.

"The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide an electronic device and a method for recognizing an asynchronous digital pen so as not to require a separate synchronization means.

"Another aspect of the present disclosure is to provide an electronic device and a method for recognizing an asynchronous digital pen, realized to contribute to slimness of the electronic device by excluding a synchronization means that should be added.

"Still another aspect of the present disclosure is to provide an electronic device and a method for recognizing an asynchronous digital pen, realized to contribute to manufacturing cost reduction by excluding a synchronization means.

"In accordance with an aspect of the present disclosure, an electronic device for receiving an input by a digital pen having a waveform generator is provided. The electronic device includes at least three reception sensors installed in the electronic device at positions that are separated from one another, and are configured to receive a waveform generated by the waveform generator of the digital pen, and a processor configured to calculate an input coordinate of the digital pen using a difference between a velocity of the waveform received by the at least three reception sensors and a reception time.

"In accordance with an aspect of the present disclosure, at least one of the at least three reception sensors is not disposed on a line between at least two other of the at least three reception sensors.

"More preferably, the reception sensors may be disposed in a region of the electronic device other than a display region of a display unit provided to the electronic device. However, they are not limited thereto but the at least three reception sensors may be disposed in the display region without influencing device units.

"In accordance with an aspect of the present disclosure, the waveform generator may be an ultrasonic wave generating unit, and the at least three reception sensors may be ultrasonic reception sensors. Also, the waveform generator may a vibration generating unit, and the at least three reception sensors may be vibration reception sensors. However, they are not limited thereto but various types of generator for generating a pulse-shaped waveform or a modulated continuous waveform may be used.

"In accordance with another aspect of the present disclosure, a method for calculating an input coordinate of a digital pen having a waveform generator in an electronic device including at least three reception sensors is provided. The method includes determining a difference of at least two reception times of waveforms received from the at least three reception sensors, respectively, and determining an input coordinate of the digital pen using the determined deference of at least two reception times and a velocity of the waveform set in advance.

"Other aspects, advantages and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

"The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

"FIG. 1 is a view illustrating a state of an electronic device for recognizing an asynchronous digital pen in use according to an embodiment of the present disclosure;

"FIG. 2 is a view illustrating an electronic device where the digital pen of FIG. 1 and reception sensors are disposed according to an embodiment of the present disclosure;

"FIG. 3 is a schematic view illustrating a time difference related to ultrasonic signal transfer between respective reception sensors and the digital pen of FIG. 2 according to an embodiment of the present disclosure;

"FIG. 4A is a graph measuring a coordinate of a digital pen by a synchronization means according to the related art;

"FIG. 4B is a graph measuring a coordinate of a digital pen, and illustrating correlation between the coordinate of the digital pen and time difference between respective reception sensors, according to an embodiment of the present disclosure;

"FIG. 5A is a graph illustrating an input error of a digital pen depending on a difference between an actual speed of sound and a speed of sound used for calculation according to the related art;

"FIG. 5B is a graph illustrating an input error of a digital pen depending on a difference between an actual speed of sound and a speed of sound used for calculation according to an embodiment of the present disclosure;

"FIG. 6 is a view illustrating an electronic device including reception sensors disposed for correcting an input error generated in FIG. 5B and a digital pen according to an embodiment of the present disclosure;

"FIG. 7 is a view illustrating a coordinate system depending on an ultrasonic wave transfer time difference between the respective reception sensors of FIG. 6 according to an embodiment of the present disclosure;

"FIG. 8A is a graph illustrating an input point of a digital pen and an input point by calculation in a case where an actual speed of sound and a speed of sound used for calculation coincide according to an embodiment of the present disclosure;

"FIG. 8B is a graph illustrating an input error between an input point of a digital pen and an input point by calculation in a case where an actual speed of sound and a speed of sound used for calculation do not coincide according to an embodiment of the present disclosure;

"FIG. 9 is a view illustrating an electronic device illustrating a digital pen and arrangement of respective reception sensors for detecting a 3 Dimensional (3D) input coordinate on a space according to an embodiment of the present disclosure;

"FIG. 10 is a block diagram illustrating an electronic device according to an embodiment of the present disclosure; and

"FIG. 11 is a flowchart illustrating a procedure for correcting an error of an input coordinate of a digital pen using a plurality of reception sensors according to an embodiment of the present disclosure.

"Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures."

For additional information on this patent application, see: RHEE, Bong-Jae. Electronic Device for Recognizing Asynchronous Digital Pen and Recognizing Method Thereof. Filed December 4, 2013 and posted July 17, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4216&p=85&f=G&l=50&d=PG01&S1=20140710.PD.&OS=PD/20140710&RS=PD/20140710

Keywords for this news article include: Electronics, Samsung Electronics Co., Samsung Electronics Co. Ltd.

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Source: Electronics Newsweekly


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