US20130249823A1 - Stylus, pressure detecting system and driving method thereof - Google Patents

Stylus, pressure detecting system and driving method thereof Download PDF

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Publication number
US20130249823A1
US20130249823A1 US13/672,321 US201213672321A US2013249823A1 US 20130249823 A1 US20130249823 A1 US 20130249823A1 US 201213672321 A US201213672321 A US 201213672321A US 2013249823 A1 US2013249823 A1 US 2013249823A1
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Prior art keywords
signal
frequency
pressure
stylus
amplitude
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Abandoned
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US13/672,321
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English (en)
Inventor
Soon-Sung Ahn
Hyoung-Wook Jang
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Samsung Display Co Ltd
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Samsung Display Co Ltd
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Filing date
Publication date
Application filed by Samsung Display Co Ltd filed Critical Samsung Display Co Ltd
Assigned to SAMSUNG DISPLAY CO., LTD reassignment SAMSUNG DISPLAY CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Ahn, Soon-Sung, JANG, HYOUNG-WOOK
Publication of US20130249823A1 publication Critical patent/US20130249823A1/en
Priority to US15/348,870 priority Critical patent/US9846497B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0383—Signal control means within the pointing device
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04162—Control or interface arrangements specially adapted for digitisers for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/038—Indexing scheme relating to G06F3/038
    • G06F2203/0384—Wireless input, i.e. hardware and software details of wireless interface arrangements for pointing devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position

Definitions

  • Embodiments of the present invention relate to a stylus, and to a pressure detecting system including a stylus and a driving method thereof.
  • a digitizer, a touch screen, or the like which is capable of replacing a conventional input device such as a keyboard and a mouse, and which is capable of directly detecting a position contacted by a human's hand or an object, has been widely used.
  • a stylus system capable of performing more elaborate, or more accurate, input (as compared to a system using the human hand) tends to increase.
  • An aspect of embodiments of the present invention provides a stylus, a pressure detecting system capable of detecting writing pressure of the stylus without changing a frequency of the signal emitted from the stylus, and a driving method thereof.
  • a stylus including a pressure detector for detecting applied pressure, a first signal generator for generating a signal of a first frequency, a second signal generator for generating a signal of a second frequency, and a controller for adjusting at least one of the first and second signal generators to control an amplitude ratio of the signal of the first frequency to the signal of the second frequency according to the applied pressure detected by the pressure detector.
  • the first frequency and the second frequency may be different from each other.
  • the first and second signal generators may be respectively configured to emit the signals of the first and second frequencies through a single signal emitter.
  • the first signal generator and the second signal generator may respectively emit the signal of the first frequency and the signal of the second frequency through different signal emitters.
  • the controller might be configured to change an amplitude of only one of the signals of the first and second frequencies to control the amplitude ratio of the signals of the first and second frequencies.
  • the controller may be configured to change both an amplitude of the signal of the first frequency and an amplitude of the signal of the second frequency to control the amplitude ratio of the signals of the first and second frequencies.
  • a pressure detecting system including a stylus including a pressure detector for detecting applied pressure, a first signal generator for generating a signal of a first frequency, a second signal generator for generating a signal of a second frequency, and a controller for adjusting at least one of the first and second signal generators to control an amplitude ratio of the signal of the first frequency to the signal of the second frequency according to the applied pressure detected by the pressure detector, and a pressure detecting apparatus for receiving the signals of the first and second frequencies from the stylus, and for detecting the applied pressure according to the amplitude ratio of the signal of the first frequency to the signal of the second frequency.
  • the first frequency and the second frequency may be different from each other.
  • the first signal generator and the second signal generator may respectively emit the signal of the first frequency and the signal of the second frequency through a single signal emitter.
  • the first signal generator and the second signal generator may respectively emit the signal of the first frequency and the signal of the second frequency through different signal emitters.
  • the controller might be configured to change an amplitude of only one of the signals of the first and second frequencies to control the amplitude ratio of the signals.
  • the controller may be configured to change both the amplitude of the signal of the first frequency and the amplitude of the signal of the second frequency to control the amplitude ratio of the signals.
  • a driving method of a pressure detecting system including detecting applied pressure, controlling an amplitude ratio of a signal of a first frequency to a signal of a second frequency according to the detected applied pressure, emitting the signal of the first frequency and the signal of the second frequency, receiving the signal of the first frequency and the signal of the second frequency, calculating the amplitude ratio of the signal of the first frequency to the signal of the second frequency, and calculating the pressure from the calculated amplitude ratio.
  • the first frequency and the second frequency may be different from each other.
  • Controlling the amplitude ratio might include changing an amplitude of only one of the signals of the first and second frequencies to control the amplitude ratio of the signals.
  • Controlling the amplitude ratio may include changing both an amplitude of the signal of the first frequency and an amplitude of the signal of the second frequency to control the amplitude ratio of the signals.
  • FIG. 1 is a diagram showing a pressure detecting system according to an exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a pressure detecting system according to an exemplary embodiment of the present invention.
  • FIGS. 3A to 4C are graphs showing an operation of controlling an amplitude ratio of two signals corresponding to pressure applied to a tip of a stylus according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing a stylus according to another exemplary embodiment of the present invention.
  • FIG. 6 is a flow chart showing a driving method of a pressure detecting system according to an exemplary embodiment of the present invention.
  • first element When a first element is described as being coupled to a second element, the first element may be directly coupled to the second element, or may be indirectly coupled to the second element via one or more other elements. Further, some elements that are not essential to the complete understanding of the embodiments of the present invention are omitted for clarity. Also, like reference numerals refer to like elements throughout.
  • FIG. 1 is a diagram showing a pressure detecting system according to an exemplary embodiment of the present invention.
  • the pressure detecting system 1 according to the present embodiment of the present invention includes a stylus 100 and a pressure detecting apparatus 200 .
  • the stylus 100 is a device capable of being used to input information by contact with the pressure detecting apparatus, the stylus 100 being used in lieu of a user's hand.
  • the stylus 100 may change an amplitude ratio of two signals emitted from the stylus 100 to enable writing pressure of the stylus 100 to be detected by the pressure detecting apparatus 200 .
  • the pressure detecting apparatus 200 may be, for example, a digitizer or a touch screen capable of recognizing information corresponding to an input (e.g., a predetermined input operation) by the stylus 100 , and detecting a position(s) contacted by the stylus 100 according to a resistive scheme, a capacitive scheme, or the like.
  • the pressure detecting apparatus 200 may detect the writing pressure of the stylus 100 (e.g., pressure between the stylus and the surface of the pressure detecting apparatus) from the amplitude ratio of the two signals emitted from the stylus 100 .
  • aspects of the present embodiment are characterized by the sensing of the writing pressure of the stylus 100 . Therefore, details of the stylus 100 and the pressure detecting apparatus 200 of the present embodiment will be described below.
  • FIG. 2 is a block diagram showing a pressure detecting system according to an exemplary embodiment of the present invention.
  • a stylus 100 may include a pressure detector 120 , a first signal generator 130 , a second signal generator 140 , and a controller 150 .
  • the pressure detector 120 may detect pressure applied to the stylus 100 .
  • the pressure detector 120 may detect pressure applied to a tip 110 of the stylus 100 according to a user's writing operation, or according to a user's manipulation of the stylus.
  • the tip 110 may be coupled to the pressure detector 120 to transfer pressure generated in, or exerted on, the tip 110 to the pressure detector 120 .
  • the tip 110 which is a part capable of contacting the pressure detecting apparatus 100 , may protrude from one end of the stylus 100 .
  • FIG. 2 shows the pressure detector 120 is configured to detect the pressure applied to the tip 110 as described above
  • the pressure detector 120 may detect other kinds of externally applied pressure to, or on, the stylus 100 , in addition to the pressure applied through the tip 110 .
  • the pressure detector 120 may detect a strength of a user's grip on the stylus 100 . Therefore, the user controls the strength of the user's hand gripping the stylus 100 , thereby making it possible to control functions (e.g., a line thickness, a color change, etc.) of the stylus (e.g., by squeezing the stylus 100 harder).
  • the pressure detector 120 may include a variable capacitor having a capacitance changed by the pressure applied to the stylus 100 .
  • the pressure detector 120 may include a variable coil, or a variable resistance (e.g., a variable resistive element), or may include a resonance circuit having at least one of the variable capacitor, the variable coil, or the variable resistance.
  • the first signal generator 130 may generate a signal S 1 of a first frequency, and may change an amplitude of the signal S 1 of the first frequency according to control of the controller 150 .
  • the second signal generator 140 may generate a signal S 2 of a second frequency, and may change an amplitude of the signal S 2 of the second frequency according to the control of the controller 150 .
  • Each of the first and second signal generators 130 and 140 may generate a signal having a fixed frequency, and may emit the signal S 1 of the first frequency and the signal S 2 of the second frequency to the outside (e.g., may externally emit the signals S 1 and S 2 ) via a signal emitter (e.g., a single signal emitter) 160 . Therefore, a separate component for changing the frequency may be omitted from within the first and second signal generators 130 and 140 .
  • the first and second frequencies may be different frequencies.
  • the controller 150 controls the first signal generator 130 and/or the second signal generator 140 corresponding to the pressure detected through the pressure detector 120 , thereby making it possible to control an amplitude ratio between the signal S 1 of the first frequency and the signal S 2 of the second frequency.
  • the controller 150 may change the amplitudes of the signal S 1 of the first frequency and/or the signal S 2 of the second frequency to have an amplitude ratio corresponding to the pressure detected through the pressure detector 120 with reference to a separate lookup table, an equation, or the like.
  • the pressure detecting apparatus 200 may receive the signal S 1 of the first frequency and the signal S 2 of the second frequency emitted from the stylus 100 , and may calculate the pressure applied to the stylus 100 from the amplitude ratio of the signals S 1 and S 2 . Accordingly, the pressure detecting apparatus 200 may include a receiver 210 and a pressure calculator 220 .
  • the receiver 210 may receive the signal S 1 of the first frequency and the signal S 2 of the second frequency, which are emitted from the signal emitter 160 of the stylus 100 .
  • the pressure calculator 220 calculates the amplitude ratio of the signal S 1 of the first frequency to the signal S 2 of the second frequency received by the receiver 210 , and inversely transforms the calculated amplitude ratio, thereby making it possible to calculate the pressure applied to the stylus 100 .
  • the pressure calculator 220 may refer to the separate lookup table or the equation (or may refer to a different lookup table or equation) similar to the controller 150 of the stylus 100 .
  • the pressure calculator 220 may include filters suitable or optimized for signals of the first frequency and the second frequency to divide the signal received by the receiver 210 into the signal S 1 of the first frequency and the signal S 2 of the second frequency. Therefore, the writing pressure of the stylus 100 may be detected by changing only the amplitude of the signals S 1 and S 2 having the fixed frequencies, and without performing a complicated process of changing the frequency of the signal.
  • FIGS. 3A to 4C are graphs showing an operation of controlling an amplitude ratio of two signals according to pressure applied to a tip of a stylus according to an embodiment of the present invention.
  • FIGS. 3A to 3C show an operation of controlling an amplitude ratio of the signals S 1 and S 2 by changing both of the amplitudes of the signals S 1 and S 2 of the first and second frequencies
  • FIGS. 4A and 4C show an operation of controlling an amplitude ratio of the signals S 1 and S 2 by changing the amplitude of the signal S 1 of the first frequency, while fixing, or not changing, the amplitude of the signal S 2 of the second frequency.
  • the controller 150 may control the signal S 1 of the first frequency and the signal S 2 of the second frequency to respectively be ‘na 1 ’ and ‘na 2 .’ Therefore, the pressure detecting apparatus 200 receiving the signal S 1 of the first frequency having an amplitude of ‘na 1 ’ and the signal S 2 of the second frequency having an amplitude of ‘na 2 ’ may calculate an amplitude ratio (‘a 1 :a 2 ’) of the signals S 1 and S 2 , and may inversely calculate the ‘Pressure A’ applied to the tip 110 from the calculated amplitude ratio.
  • the controller 150 may change the amplitudes of the signal S 1 of the first frequency and the signal S 2 of the second frequency to respectively be ‘nb 1 ’ and ‘nb 2 .’ Therefore, the pressure detecting apparatus 200 receiving the signal S 1 of the first frequency having the amplitude of ‘nb 1 ’ and the signal S 2 of the second frequency having the amplitude of ‘nb 2 ’ may calculate an amplitude ratio (‘b 1 :b 2 ’) of the signals S 1 and S 2 , and may inversely calculate the ‘Pressure B’ applied to the tip 110 from the calculated amplitude ratio.
  • the controller 150 may set the amplitude of the signal S 1 of the first frequency to be ‘0.’ That is, the generation of the signal S 1 of the first frequency may be stopped such that only the signal S 2 of the second frequency is transferred to the pressure detecting apparatus 200 . Therefore, a situation where the pressure detecting apparatus 200 is receiving only the signal S 2 of the second frequency may indicate that the stylus 100 is in the hovering state.
  • the controller 150 may control amplitudes of the signal S 1 of the first frequency and the signal S 2 of the second frequency to be the same as each other.
  • the controller 150 might control only the amplitude of the signal S 1 of the first frequency to be ‘nc 1 .’ Therefore, the pressure detecting apparatus 200 receiving the signals S 1 and S 2 of the first and second frequencies having the same amplitude of ‘nc 1 ’ may calculate an amplitude ratio (‘1:1’) of the signals S 1 and S 2 , and may inversely calculate the ‘Pressure C’ applied to the tip 110 from the calculated amplitude ratio.
  • the pressure detecting apparatus 200 receiving the signal S 1 of the first frequency having the amplitude of ‘nd 1 ’ and the signal S 2 of the second frequency having the amplitude of ‘nc 1 ’ may calculate an amplitude ratio (‘d 1 :c 1 ’) of the signals S 1 and S 2 , and may inversely calculate the pressure ‘D’ applied to the tip 110 from the calculated amplitude ratio.
  • the pressure applied to the tip 110 of the stylus 100 when the pressure applied to the tip 110 of the stylus 100 is changed from ‘C’ to ‘0’ (that is, when the stylus 100 is changed to the ‘Hovering’ state), and when an amplitude ratio corresponding to the pressure ‘0’ is set to be ‘e 1 :c 1 ,’ the amplitude of the signal S 2 of the second frequency may be fixed at ‘nc 1 .’ Therefore, the controller 150 might control, or change, only the amplitude of the signal S 1 of the first frequency to be ‘ne 1 .’ Therefore, the pressure detecting apparatus 200 receiving the signal S 1 of the first frequency having the amplitude of ‘ne 1 ’ and the signal S 2 of the second frequency having the amplitude of ‘nc 1 ’ may calculate an amplitude ratio (‘e 1 :c 1 ’) of the signals S 1 and S 2 , and may inversely calculate the pressure ‘0’ applied to the tip 110 from the calculated amplitude ratio. Because only the amplitude of any one of
  • FIG. 5 is a diagram showing a stylus according to another exemplary embodiment of the present invention.
  • the stylus 200 may be configured to include a first signal emitter 161 and a second signal emitter 162 . Therefore, the first and second signal generators 130 and 140 may respectively externally emit a signal S 1 of a first frequency and a signal S 2 of a second frequency through different signal emitters 161 and 162 .
  • the first signal generator 130 may externally emit the signal S 1 of the first frequency through the first signal emitter 161
  • the second signal generator 140 may externally emit the signal S 2 of the second frequency through the second signal emitter 162 .
  • FIG. 6 is a flow chart showing a driving method of a pressure detecting system according to an exemplary embodiment of the present invention.
  • the driving method of the pressure detecting system according to the present exemplary embodiment of the present invention includes a pressure detecting step (S 100 ); an amplitude ratio changing step (S 200 ); a signal emitting step (S 300 ), an amplitude ratio calculating step (S 400 ), and a pressure calculating step (S 500 ).
  • pressure applied to the stylus 100 is detected.
  • pressure applied to the tip 110 of the stylus 100 may be detected, and/or pressure applied by grip strength of a hand gripping the stylus 100 may be detected. Further, the pressure applied to the stylus 100 may be calculated through the pressure detector 120 including a variable capacitor, or the like.
  • an amplitude ratio of a signal S 1 of a first frequency to a signal S 2 of a second frequency is changed in a manner corresponding to the pressure detected in the pressure detecting step (S 100 ).
  • the amplitude ratio of the signals S 1 and S 2 may be controlled by changing any one of the signals S 1 and S 2 or by changing both of the signals S 1 and S 2 .
  • the first and second frequencies of the signals S 1 and S 2 may be different from each other.
  • the signal S 1 of the first frequency and the signal S 2 of the second frequency may be externally emitted.
  • the signal S 1 of the first frequency and the signal S 2 of the second frequency may be externally emitted via a single signal emitter 160 (as shown in FIG. 2 ), or may be emitted through different signal emitters 161 and 162 (as shown in FIG. 5 ).
  • the amplitude ratio of the signal S 1 of the first frequency to the signal S 2 of the second frequency, which are received in the pressure detecting apparatus 200 may be calculated.
  • the pressure applied to the stylus 100 may be calculated using the amplitude ratio calculated in the amplitude calculating step (S 400 ).
  • the stylus the pressure detecting system for detecting writing pressure of the stylus without changing the frequency of the signal emitted from the stylus, and the driving method thereof, may be provided.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • User Interface Of Digital Computer (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
US13/672,321 2012-03-26 2012-11-08 Stylus, pressure detecting system and driving method thereof Abandoned US20130249823A1 (en)

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KR1020120030587A KR101282430B1 (ko) 2012-03-26 2012-03-26 스타일러스, 압력 검출 시스템 및 그의 구동방법

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US9846497B2 (en) 2017-12-19
US20170123518A1 (en) 2017-05-04

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