WO2016006426A1 - タッチパネルシステム及び電子機器 - Google Patents
タッチパネルシステム及び電子機器 Download PDFInfo
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- WO2016006426A1 WO2016006426A1 PCT/JP2015/067922 JP2015067922W WO2016006426A1 WO 2016006426 A1 WO2016006426 A1 WO 2016006426A1 JP 2015067922 W JP2015067922 W JP 2015067922W WO 2016006426 A1 WO2016006426 A1 WO 2016006426A1
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- WIPO (PCT)
- Prior art keywords
- touch panel
- pen
- signal
- stylus pen
- touch
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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
- G06F3/0354—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
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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
- G06F3/041—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
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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
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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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
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0441—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
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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
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0442—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser
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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
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
Definitions
- the present invention relates to a touch panel system for detecting a position on a touch panel of a touch pen that touches the touch panel, and an electronic device including the touch panel system.
- a touch panel system for detecting a position on a touch panel of a stylus pen (touch pen) that touches the touch panel
- a configuration in which a writing pressure sensor for detecting writing pressure is provided in the stylus pen is known.
- This stylus pen has a pen tip provided so as to be movable in the axial direction according to the writing pressure.
- a writing pressure sensor provided in the stylus pen generates a voltage signal corresponding to the amount of movement of the pen tip due to the load. Then, based on a signal generated by the writing pressure sensor and a predetermined threshold value, it is determined whether or not the stylus pen touches the touch panel.
- the voltage signal of the writing pressure sensor changes when there is no touch on the touch panel due to environmental changes such as the temperature change around the stylus pen and the aging characteristics of the stylus pen components. It becomes difficult to correctly determine the presence or absence of touch.
- Patent Document 1 discloses a configuration in which a long-time average value of a voltage signal of a writing pressure sensor when there is no touch is obtained and a threshold value of the writing pressure sensor is updated based on the long-time average value.
- FIG. 18A is a schematic diagram for explaining the configuration of the stylus pen 93 and the touch panel 92.
- FIG. 18B shows the voltage from the writing pressure sensor 61d provided in the stylus pen 93 and the writing pressure sensor 61d. It is a graph which shows the relationship between the load added.
- the stylus pen 93 includes a pen tip 61 that is provided so as to be movable in the axial direction according to the writing pressure, and a writing pressure sensor 61 d that generates a voltage signal corresponding to the amount of movement of the pen tip 61.
- a writing pressure sensor 61 d that generates a voltage signal corresponding to the amount of movement of the pen tip 61.
- FIG. 19A is a schematic diagram for explaining the transition of the operation of the pen tip 61 provided on the stylus pen 93
- FIG. 19B shows the transition of the voltage from the writing pressure sensor 61 d provided on the stylus pen 93. It is a graph which shows.
- the pen tip 61 that has moved in the axial direction is a member that exerts a restoring force when the stylus pen 93 is separated from the touch panel 92 again. Thus, it is expected to return to the original position.
- the pen tip 61 may not return to the original position or may return too much beyond the original position, resulting in variations in the return position.
- This variation varies depending on the mechanism design method related to the nib 61 and the size variation of the parts used in the mechanism. As a result, the voltage from the writing pressure sensor 61d detected in a state where the pen tip 61 does not touch the touch panel 92 varies.
- the voltage V91 is output from the writing pressure sensor 61d of the stylus pen 93 that is away from the touch panel 92. And stylus pen 93 contacts touch panel 92 at time t91.
- the writing pressure of the stylus pen 93 is increased from time t91 to time t92, the pen tip 61 moves in the axial direction toward the writing pressure sensor 61d.
- the voltage output from the writing pressure sensor 61d decreases from the voltage V91 to the voltage V92.
- the pen tip 61 holds the position in the axial direction, and the voltage of the sensor 61d holds the voltage V92.
- the stylus pen 93 comes into contact with the touch panel 92 at time t95.
- the pen tip 61 moves again in the axial direction toward the writing pressure sensor 61d.
- the voltage output from the writing pressure sensor 61d decreases from the voltage V93 to the voltage V92.
- the pen tip 61 holds the position in the axial direction, and the voltage of the sensor 61d holds the voltage V92.
- the pen tip 61 moves in the axial direction toward the direction away from the writing pressure sensor 61d and returns to the original position until time 91. Return to the position where you can not return.
- the voltage of the writing pressure sensor 61d increases to a voltage V94 that is lower than the original voltage V91 up to time 91.
- the voltage from the writing pressure sensor 61d detected when the pen tip 61 does not touch the touch panel 92 is the voltage V91 before time t91, and the voltage V93 from time t94 to time t95. After time t98, the voltage is V94. Therefore, every time the stylus pen 93 is pushed into the touch panel 92 and released, there is a problem that the voltage from the non-touch writing pressure sensor 61d varies.
- the determination of the presence / absence of the touch is as sensitive and accurate as possible with respect to the slight touch of the pen tip 61 to the touch panel 92.
- the stylus pen 93 is brought into contact with the touch panel 92 at time t95. After that, until the time t99, the pen tip 61 is pushed into the touch panel 92 slightly larger and the voltage of the writing pressure sensor 61d does not decrease until it falls below the voltage V94 from the voltage V91. For this reason, there is a problem that the sensitivity of the stylus pen 93 is felt unstable.
- An object of the present invention is to provide a touch panel system and an electronic device in which the sensitivity of the stylus pen to the touch panel is stable even if the return position of the pen tip varies every time the stylus pen is pushed into the touch panel and released.
- a touch panel system is a touch panel system for detecting a position on a touch panel of a touch pen that touches the touch panel, and the touch pen responds to writing pressure. And a pen pressure sensor that generates a signal corresponding to the amount of movement of the pen tip, based on the distance between the touch pen and the touch panel, A threshold update circuit for updating a threshold for determining whether or not there is writing pressure by the writing pressure sensor is provided.
- an electronic device includes the touch panel system according to one embodiment of the present invention.
- the sensitivity of the stylus pen to the touch panel is stabilized.
- FIG. 1 is a block diagram illustrating a configuration of a touch panel system according to Embodiment 1.
- FIG. It is a wiring diagram which shows the structure of the touchscreen provided in the said touchscreen system. It is a circuit diagram which shows the structure of the multiplexer for switching the connection of the signal line connected to the said touch panel, the drive line connected to the driver, and the sense line connected to the sense amplifier. It is a block diagram which shows the structure of the stylus pen in the said touch panel system. It is a timing chart which shows the basic operation
- (A) is a figure which shows the output relationship to the touchscreen and stylus pen in the drive line of the driver in a touchscreen controller, and the sense line of a sense amplifier
- (b) is a wave form diagram which shows a synchronous waveform and a waveform for touch detection.
- (A) is a schematic diagram which shows the aspect in which the said touch panel controller drives the said touch panel with a synchronizing signal, (b) drives the said touch panel with the drive signal for the said touch panel controller to detect the position of the said stylus pen. It is a schematic diagram which shows an aspect.
- (A) is a schematic diagram which shows the position with respect to the said touch panel of the said stylus pen when the said touch panel controller is driving the said touch panel with a synchronizing signal
- (b) is another position with respect to the said touch panel of the said stylus pen
- (C) is a schematic diagram which shows the further another position with respect to the said touchscreen of the said stylus pen. It is a graph which shows the relationship between the amplitude of the synchronizing signal which the said stylus pen detects, and the distance from the said touch panel of the said stylus pen.
- (A) is a schematic diagram for explaining the transition of the positional relationship of the stylus pen with respect to the touch panel
- (b) is a graph showing the transition of the voltage from the writing pressure sensor provided in the stylus pen
- (C) is a graph which shows transition of the amplitude of the synchronizing signal which the said stylus pen detects.
- (A) is a graph which shows transition of the voltage from the pen pressure sensor provided in the stylus pen concerning Embodiment 2, and the threshold for judging the presence or absence of pen pressure with the above-mentioned pen pressure sensor
- (b) These are graphs showing the transition of the amplitude of the synchronization signal detected by the stylus pen. It is a schematic diagram which shows the structure of the touchscreen system which concerns on Embodiment 3.
- (A) is a schematic diagram for demonstrating the positional relationship of the touchscreen of the touchscreen system which concerns on Embodiment 3, and a stylus pen, (b) is with respect to the pen drive signal which the stylus pen of the said touchscreen system output. It is a wave form diagram which shows the pen signal amplitude obtained with a touch panel controller.
- (A) is a schematic diagram for demonstrating the other positional relationship of the touchscreen of the said touchscreen system, and a stylus pen, (b) is a pen signal obtained with a touchscreen controller about the pen drive signal relevant to the said positional relationship. It is a wave form diagram which shows an amplitude.
- FIG. 6 is a block diagram illustrating a configuration of a mobile phone according to a fourth embodiment.
- (A) is a schematic diagram for demonstrating the structure of a stylus pen and a touchscreen
- (b) is the voltage from the pen pressure sensor provided in the said stylus pen, and the load applied to the said pen pressure sensor. It is a graph which shows the relationship between.
- (A) is a schematic diagram for demonstrating transition of operation
- (b) is a graph which shows transition of the voltage from the pen pressure sensor provided in the said stylus pen. is there.
- FIG. 1 is a block diagram showing the configuration of the touch panel system 1 of the present embodiment
- FIG. 2 is a wiring diagram showing the configuration of the touch panel 2 provided in the touch panel system 1.
- the touch panel system 1 of the present embodiment includes a touch panel 2, a stylus pen (touch pen) 3, and a touch panel controller (control unit) 10 that drives the touch panel 2 and the stylus pen 3. Yes.
- the touch panel 2 includes K horizontal signal lines HL 1 to HL K (K is a positive integer) arranged parallel to each other along the horizontal direction, and parallel to each other along the vertical direction. (L is a positive integer) vertical signal lines VL 1 to VL L. Capacitors C11 to CKL are generated at the intersections of the horizontal signal lines HL 1 to HL K and the vertical signal lines VL 1 to VL L , respectively. Note that K and L may be the same or different from each other, but in the present embodiment, description will be made assuming that L ⁇ K. Further, in the present embodiment, the horizontal signal lines HL 1 to HL K and the vertical signal lines VL 1 to VL L intersect each other vertically. However, in the present invention, the present invention is not limited to this, and both are mutually connected. It is enough if they cross.
- the touch panel 2 is preferably wide enough to be worn by the hand holding the stylus pen 3, but may be a size used for a smartphone.
- the stylus pen 3 is not only a touch pen made of a conductor for contacting the touch panel 2 but also a pen that can input and output signals. As will be described later, the stylus pen 3 is provided with a synchronization signal detection circuit (synchronization circuit) 36, and a synchronization signal for synchronizing with a dedicated synchronization signal generated by the timing generator 14 of the touch panel controller 10. Is received and input.
- a synchronization signal detection circuit synchronization circuit
- the touch panel controller 10 includes a multiplexer 11, a driver 12, a sense amplifier 13, a timing generator 14, an AD converter 15, a capacity distribution calculation unit 16, a touch recognition unit 17, and a pen position detection unit 18. I have.
- the driver 12 the horizontal signal lines HL 1 ⁇ described above in the touch panel 2 HL K or vertical signal lines VL 1 ⁇ VL driveline DL 1 in response to driving of the L ⁇ DL K or driveline DL 1 ⁇ DL L to the voltage Is applied.
- the sense amplifier 13 When the horizontal signal lines HL 1 to HL K are driven in the first signal line driving period, the sense amplifier 13 outputs a charge signal corresponding to each capacitor C11 to CKL of the touch panel 2, and the stylus pens 3 and L at the time of touch.
- a linear sum signal corresponding to a first pen drive signal (pen drive signal) which is a charge at the time of touch corresponding to the electrostatic capacitance between each of the vertical signal lines VL 1 to VL L is expressed as a sense line SL 1. It reads through ⁇ SL K, supplied to the AD converter 15.
- the capacitance of the capacitor at the position changes when the stylus pen 3 is brought close to a certain position on the touch panel 2. Therefore, the amount of charge corresponding to the changed capacitance can be detected as a linear sum signal. Normally, when the stylus pen 3 is brought closer to the touch panel 2, the capacitances of the capacitors C11 to CKL at the closer positions increase.
- the sense amplifier 13 has a charge signal corresponding to each of the capacitors C11 to CKL of the touch panel 2 and the stylus pen 3 at the time of touch when the vertical signal lines VL 1 to VL L are driven in the second signal line drive period.
- a linear sum signal corresponding to the second pen drive signal (pen drive signal) representing the electric charge corresponding to the capacitance of the capacitor between each of the K horizontal signal lines HL 1 to HL K is sensed SL. 1 to SL L are read out and supplied to the AD converter 15.
- FIG. Figure 3 is a horizontal signal lines HL 1 - provided the touch panel 2 HL K, or vertical signal lines VL 1 ⁇ VL K ⁇ VL L and ⁇ driveline DL 1 which is connected to the driver DL K-DL L or sense 3 is a circuit diagram showing a configuration of a multiplexer that switches connection with sense lines SL 1 to SL K to SL L connected to an amplifier 13.
- FIG. 1 is a horizontal signal lines HL 1 - provided the touch panel 2 HL K, or vertical signal lines VL 1 ⁇ VL K ⁇ VL L and ⁇ driveline DL 1 which is connected to the driver DL K-DL L or sense 3 is a circuit diagram showing a configuration of a multiplexer that switches connection with sense lines SL 1 to SL K to SL L connected to an amplifier 13.
- FIG. 1 is a horizontal signal lines HL 1 - provided the touch panel 2 HL K, or vertical signal lines VL 1 ⁇ VL K ⁇ VL L and ⁇ driveline DL 1 which
- the multiplexer 11 is a connection switching circuit that switches connection between a plurality of inputs and a plurality of outputs.
- the horizontal signal lines HL 1 to HL K are connected to the drive lines DL 1 to DL K of the driver 12, and the vertical signal lines VL 1 to VL K to VL L are connected to sense amplifiers.
- 13 a first connection state of connecting to the sense line SL 1 ⁇ SL K ⁇ SL L of, connect the horizontal signal lines HL 1 ⁇ HL K to sense line SL 1 ⁇ SL K of the sense amplifier 13, the vertical signal line VL 1 ... VL K to VL L are switched to the second connection state in which the drive lines DL 1 to DL K to DL L of the driver 12 are connected.
- the horizontal signal lines HL 1 to HL K are connected to the drive lines DL 1 to DL K and the vertical signal lines VL 1 to VL L Are connected to the sense lines SL 1 to SL L.
- the horizontal signal lines HL 1 to HL K are connected to the sense lines SL 1 to SL K
- the vertical signal lines VL 1 to VL L are connected to the drive lines DL 1 to DL L. To be connected to.
- the timing generator 14 shown in FIG. 1 generates a signal that defines the operation of the driver 12, a signal that defines the operation of the sense amplifier 13, and a signal that defines the operation of the AD converter 15.
- the signals are supplied to the driver 12, the sense amplifier 13, and the AD converter 15, respectively.
- the timing generator 14 generates a synchronization signal.
- the touch panel controller 10 drives the horizontal signal lines HL 1 to HL K and the vertical signal lines VL 1 to VL L by using the synchronization signal generated by the timing generator 14 as a dedicated synchronization signal.
- the AD converter 15 includes charges corresponding to the capacitances C11 to CKL read through the vertical signal lines VL 1 to VL L and the sense lines SL 1 to SL L in the first signal line driving period, AD conversion of the linear sum signal corresponding to the first pen drive signal (pen drive signal), which is the charge corresponding to the capacitance between the stylus pen 3 and each of the L vertical signal lines VL 1 to VL L And supplied to the capacity distribution calculation unit 16.
- the AD converter 15 includes the charges corresponding to the capacitors C11 to CKL read through the horizontal signal lines HL 1 to HL K and the sense lines SL 1 to SL K and the stylus pen 3 in the second signal line driving period.
- a linear sum signal corresponding to the second pen drive signal (pen drive signal) which is a charge corresponding to the capacitance between each of the K horizontal signal lines HL 1 to HL K , is AD converted to a capacitance This is supplied to the distribution calculation unit 16.
- the capacitance distribution calculation unit 16 determines the capacitance distribution on the touch panel 2 based on the linear sum signal including the first pen driving signal and the second pen driving signal and the code sequence based on the driving, and The distribution of capacitance between the stylus pen 3 and each of the L vertical signal lines VL 1 to VL L and the static between the stylus pen 3 and each of the K horizontal signal lines HL 1 to HL K The distribution of capacitance is calculated, and the capacitance distribution on the touch panel 2 is supplied to the touch recognition unit 17, and the electrostatic capacitance between the stylus pen 3 and each of the L vertical signal lines VL 1 to VL L is calculated.
- the distribution of capacitance and the distribution of capacitance between the stylus pen 3 and each of the K horizontal signal lines HL 1 to HL K are supplied to the pen position detection unit 18 serving as position detection means.
- the touch recognition unit 17 recognizes the touched position on the touch panel 2 based on the capacitance distribution supplied from the capacitance distribution calculation unit 16.
- the pen position detector 18 is arranged along the horizontal signal line HL 1 of the stylus pen 3 based on the distribution of capacitance between the stylus pen 3 and each of the L vertical signal lines VL 1 to VL L. Detect position.
- the pen position detection unit 18 follows the vertical signal line VL 1 of the stylus pen 3 based on the distribution of capacitance between the stylus pen 3 and each of the K horizontal signal lines HL 1 to HL K. Detect position.
- the horizontal signal lines HL 1 to HL K are connected to the drive lines DL 1 to DL K of the driver 12, and the vertical signal lines VL 1 to VL L are connected to the sense line SL of the sense amplifier 13.
- the driver 12 drives the horizontal signal lines HL 1 ⁇ HL K by applying a voltage to the drive line DL 1 ⁇ DL K.
- pen drive signal a pen drive signal that is a charge corresponding to the capacitance between each of the L vertical signal lines VL 1 to VL L.
- the sense amplifier 13 reads the L first linear sum signals including the first pen drive signal through the multiplexer 11 and the sense lines SL 1 to SL L, and supplies them to the AD converter 15.
- the AD converter 15 AD-converts the L first linear sum signals including the first pen drive signal and outputs the converted signals to the capacitance distribution calculation unit 16.
- the first connection state is switched to the second connection state so that the drive signals and sense signals of the horizontal signal lines HL 1 to HL K and the vertical signal lines VL 1 to VL L are interchanged. That is, in the second connection state, the horizontal signal lines HL 1 to HL K are connected to the sense lines SL 1 to SL K of the sense amplifier 13, and the vertical signal lines VL 1 to VL L are connected to the drive lines DL 1 to DL of the driver 12. Connect to L.
- the driver 12 drives the vertical signal lines VL 1 ⁇ VL L by applying a voltage to the drive line DL 1 ⁇ DL L.
- the charges accumulated in the capacitors C11 to CKL by driving the vertical signal lines VL 1 to VL L , the stylus pen 3 and the K horizontal signal lines HL 1 to HL K K second linear sum signals based on a second pen drive signal (pen drive signal) that is an electric charge corresponding to the capacitance between them are obtained from each of the K horizontal signal lines HL 1 to HL K. Is output.
- the sense amplifier 13 reads the K second linear sum signals including the second pen drive signal through the multiplexer 11 and the sense lines SL 1 to SL K, and supplies them to the AD converter 15.
- the AD converter 15 performs AD conversion on the K second linear sum signals including the second pen drive signal and outputs the converted signals to the capacitance distribution calculation unit 16.
- the capacitance distribution calculation unit 16 includes the first linear sum signal including the first pen drive signal, the second linear sum signal including the second pen drive signal, and the electrostatic on the touch panel 2. supplies to the touch recognition unit 17 calculates the volume distribution, the position along the horizontal signal lines HL 1 of stylus pen 3, and calculates and pen position detecting position along the vertical signal line VL 1 stylus pen 3 Supply to unit 18.
- the touch recognition unit 17 recognizes the touched position on the touch panel 2 based on the capacitance distribution supplied from the capacitance distribution calculation unit 16.
- the pen position detection unit 18 is based on the position along the horizontal signal line HL 1 of the stylus pen 3 calculated by the capacitance distribution calculation unit 16 and the position along the vertical signal line VL 1 of the stylus pen 3. The position of the stylus pen 3 on the touch panel 2 is detected.
- the horizontal signal lines HL 1 to HL K and the vertical signal lines VL 1 to VL L are all driven simultaneously in parallel. That is, parallel driving is performed.
- the present invention is not limited to this, and the driving of the K horizontal signal lines HL 1 to HL K and the driving of the L vertical signal lines VL 1 to VL L in the touch panel 2 is performed in either parallel driving or sequential driving. There may be.
- Parallel driving means driving K horizontal signal lines HL 1 to HL K or driving L vertical signal lines VL 1 to VL L simultaneously in parallel, and sequential driving means K horizontal signal lines.
- the driving of HL 1 to HL K or the L vertical signal lines VL 1 to VL L are sequentially driven from the horizontal signal line HL 1 or the vertical signal line VL 1 sequentially. From the viewpoint of speed, parallel driving is preferable, and in this embodiment, parallel driving is adopted.
- the touch panel system 1 includes the touch panel 2, the stylus pen 3, and the touch panel controller 10 each having a capacitor formed at the intersection of the plurality of first signal lines and the plurality of second signal lines. I have.
- the touch panel controller 10 drives the horizontal signal lines HL 1 to HL K , which are a plurality of first signal lines, in the first signal line driving period, and outputs a charge signal based on the capacitance of each capacitor to each second signal line.
- a charge signal based drives the vertical signal lines VL 1 ⁇ VL L is a plurality of second signal lines to the electrostatic capacitance of each capacitor in the second signal line drive period
- the touch signal of the stylus pen 3 and an erroneous signal due to phantom noise are detected. And erroneous signals due to the phantom noise can be removed.
- the phantom noise is noise that generates a detection signal based on static electricity at a position different from the touch position of the stylus pen 3 through a hand holding the stylus pen 3, and is different from the normal touch position of the stylus pen 3. So it is what is considered noise.
- the stylus pen 3 of the present embodiment has, for example, a writing pressure sensor 31d for detecting writing pressure, and a writing pressure signal is output from the writing pressure sensor 31d while synchronizing with the touch panel controller 10. It has become so.
- FIG. 4 is a cross-sectional view showing the configuration of the stylus pen 3.
- the stylus pen 3 includes a pen body 30 that is held by a user and has a conductive grip portion 30 a formed in a substantially cylindrical shape so that the user can hold it by hand.
- a tip 31 is provided with a pen tip 31 that is pressed against the touch panel 2 during a touch operation.
- the pen tip 31 includes a pen tip cover 31a, a pen tip shaft 31b, and insulators 31c and 31c that hold the pen tip cover 31a in an axially movable manner.
- a pen pressure sensor 31d is provided on the back side of the pen tip shaft 31b.
- the pen tip cover 31a is made of an insulating material, and the pen tip shaft 31b is made of a conductive material, for example, a metal or a conductive synthetic resin material.
- the writing pressure sensor 31d is composed of, for example, a semiconductor piezoresistive pressure sensor, and a semiconductor strain gauge is formed on the surface of a diaphragm (not shown). Accordingly, when the pen tip cover 31a of the pen tip 31 is pressed against the touch panel 2 during the touch operation, the pen tip shaft 31b is pushed through the pen tip cover 31a to press the surface of the diaphragm of the writing pressure sensor 31d. Thus, a change in electric resistance due to the piezoresistance effect generated by the deformation of the diaphragm is converted into an electric signal. Thereby, the writing pressure in the stylus pen 3 can be detected. As described above, the pen tip 31 is provided so as to be movable in the axial direction of the stylus pen 3 according to the writing pressure, and the writing pressure sensor 31 d generates a signal corresponding to the amount of movement of the pen tip 31.
- the principle of pen pressure detection is not necessarily limited to this, and other detection principles can be employed.
- the pen pressure may be detected by configuring the pen tip to move in the axial direction according to the pen pressure to shield between the LED and the photodiode.
- the pen body 30 includes a connection switch 32, a control circuit 33, operation changeover switches 34a and 34b, a sense circuit (synchronization circuit) 35, a synchronization signal detection circuit (synchronization circuit) 36, and a timing adjustment circuit. 37, a drive circuit (pen drive circuit) 38, and a threshold update circuit 40 are provided.
- the connection switch 32 can be omitted. When the connection switch 32 is omitted, the output of the control circuit 33 is connected to a reference potential (GND), for example.
- GND reference potential
- connection switch 32 is an electronic switch composed of a field effect transistor (FET) or the like, and is turned on / off by the control circuit 33.
- FET field effect transistor
- the connection switch 32 is OFF, the pen tip shaft 31 b is electrically disconnected from the grip portion 30 a of the pen body 30.
- the stylus pen 3 may be difficult to obtain the synchronization signal of the touch panel 2 even if the pen tip cover 31a is brought close to the touch panel 2. is there.
- the connection switch 32 when the connection switch 32 is turned on, the pen tip shaft 31b is electrically connected to the grip portion 30a of the pen body 30, and the human body is electrically connected to the pen tip shaft 31b via the grip portion 30a. Accordingly, since the human body has a relatively large capacitance, when the stylus pen 3 approaches or comes into contact with the touch panel 2, the stylus pen 3 may easily acquire a synchronization signal of the touch panel 2.
- the stylus pen 3 is provided with, for example, a push-type first operation switch 39a and a second operation switch 39b.
- a push-type first operation switch 39a and a second operation switch 39b By pressing the first operation switch 39a and the second operation switch 39b, the first operation switch 39a and the second operation switch 39b are pressed.
- the functions assigned to the first operation switch 39 a and the second operation switch 39 b are executed via the control circuit 33.
- An example of the function assigned to the first operation switch 39a is an eraser function.
- the eraser function can be turned on / off by the first operation switch 39a.
- a function assigned to the second operation switch 39b for example, a right click function of the mouse can be cited, and the right click function of the mouse can be turned on / off by the second operation switch 39b. is there.
- eraser function and the right-click function of the mouse are examples, and are not limited to the eraser function and the right-click function of the mouse. It is also possible to add other functions by providing other operation switches.
- the touch signal to the touch panel 2 of the stylus pen 3 that is, the first pen drive signal and the second pen drive signal described above, touch the stylus pen 3 on the touch panel 2 with the connection switch 32 of the stylus pen 3 turned on.
- the touch position is detected by switching driving between the horizontal signal lines HL 1 to HL K and the vertical signal lines VL 1 to VL L.
- the driving pattern of the stylus pen 3 is driven by the drive circuit 38 in the first signal line driving period. Is matched with the drive pattern of the horizontal signal line HL K + 1 (or later) of the touch panel 2 by the touch panel controller 10, that is, the drive pattern of the (K + 1) th (or later) drive line DL K + 1 (or later) of the driver 12. In the second signal line drive period, the drive pattern of the vertical signal line VL L + 1 (or later) of the touch panel 2 by the touch panel controller 10, that is, the (L + 1) th (or later) drive line DL L + 1 (or later) of the driver 12. ) It adopts a method that match the pattern.
- the horizontal signal line HL K + 1 (or later) and the vertical signal line VL L + 1 (or later) itself do not exist.
- the drive pattern may be different depending on the drive period (K ⁇ L) as in the drive line DL K + 1 or drive line DL L + 1.
- a virtual line is displayed using the notation of the line DL L + 1 . In the following description, it will be expressed as drive line DL L + 1 .
- the stylus pen 3 of the present embodiment transmits and receives signals to and from the touch panel controller 10 wirelessly. Accordingly, the pen tip 31 is driven in the same pattern as driving the drive line DL L + 1 so as to match the drive timing of the drive lines DL 1 to DL L in the touch panel controller 10. In view of this, the stylus pen 3 is provided with a drive circuit 38 to drive in the same manner as the driver 12 of the touch panel controller 10.
- the drive of the drive lines DL 1 to DL L in the touch panel controller 10 is based on the drive timing generated by the timing generator 14. For this reason, the stylus pen 3 must also be operated in synchronization with the timing when the touch panel controller 10 is driven. Therefore, in the stylus pen 3 of the present embodiment, by providing the sense circuit 35, the synchronization signal detection circuit 36, and the timing adjustment circuit 37, the dedicated synchronization signal driven by the touch panel controller 10 is detected by the stylus pen 3, The timing of the dedicated synchronization signal of the touch panel controller 10 and the timing of the pen synchronization signal generated by the timing adjustment circuit 37 in the stylus pen 3 are made to coincide.
- FIG. 5 is a timing chart showing the basic principle of how to synchronize.
- the stylus pen 3 detects the dedicated synchronization signal generated by the timing generator 14 of the touch panel controller 10 by the sense circuit 35 and the synchronization signal detection circuit 36.
- the dedicated synchronization signal is a single pulse.
- the touch panel synchronization signal S0 which is a dedicated synchronization signal composed of a single pulse, is generated at a constant cycle.
- the sense circuit 35 generates a plurality of synchronization signal candidates S1 to Sp (p is an integer of 2 or more).
- the synchronization signal candidate Sp shown in FIG. 5 represents a signal in which the synchronization signal candidate S1 is delayed by about one cycle.
- the stylus pen 3 selects a synchronization signal having a high degree of coincidence with the dedicated synchronization signal transmitted from the timing generator 14 of the touch panel controller 10 from among the synchronization signal candidates S1 to Sp, and serves as a synchronization signal for communication with the touch panel controller 10. adopt.
- the synchronization signal candidate S4 or S5 having a high degree of coincidence with the touch panel synchronization signal S0 is employed as the pen synchronization signal of the stylus pen 3.
- the stylus pen 3 is in a detection mode until the synchronization is established, and the drive circuit 38 is not driven.
- the stylus pen 3 can be synchronized with the dedicated synchronization signal in the touch panel controller 10.
- FIG. 6A is a diagram showing an output relationship to the touch panel 2 and the stylus pen 3 in the drive line of the driver 12 and the sense line of the sense amplifier 13 in the touch panel controller 10, and FIG. 6B is a synchronization waveform and a touch detection waveform.
- FIG. 7A is a schematic diagram showing a mode in which the touch panel controller 10 drives the touch panel 2 by a synchronization signal
- FIG. 7B shows the touch panel 2 by a drive signal for the touch panel controller 10 to detect the position of the stylus pen 3. It is a schematic diagram which shows the aspect which drives.
- the dedicated synchronization signal of the touch panel controller 10 is generated by the timing generator 14 of the touch panel controller 10 and is driven by the driver 12 to the drive lines DL 1 to DL. Transmitted using L. Then, as a mechanism for notifying the stylus pen 3 of a dedicated synchronization signal that is the driving timing of the touch panel controller 10, as shown in FIG. 6B, driving with a waveform representing synchronization separately from a normal touch detection waveform.
- the lines DL 1 to DL L are driven. Specifically, in each of the drive lines DL 1 to DL L , a waveform for touch detection is generated after a synchronization waveform is generated.
- the driver 12 of the touch panel controller 10 drives the drive lines DL 1 to DL L with the same rectangular waveform (synchronization signal).
- the stylus pen 3 receives the synchronization waveform.
- the driver 12 drives the drive lines DL 1 to DL L with a touch detection waveform (drive signal) for detecting the position of the stylus pen 3 on the touch panel 2.
- the stylus pen 3 outputs a touch detection waveform (pen drive signal) corresponding to the drive line DL L + 1 to the touch panel 2.
- the driver 12 drives the drive lines DL 1 to DL L with a synchronization waveform (synchronization signal) in the synchronization period from time t3 to time t4.
- the stylus pen 3 receives the synchronization waveform.
- the driver 12 is in the driving period from time t4 to time t5, drives the drive line DL 1 ⁇ DL L by the touch detection waveform (drive signal).
- the stylus pen 3 outputs a touch detection waveform (pen drive signal) corresponding to the drive line DL L + 1 to the touch panel 2.
- a waveform for touch detection is generated by sequential driving.
- the generation of the synchronous waveform is expressed by a plurality of continuous pulses in order to facilitate visual distinction from the sequentially driven waveform.
- an M-sequence code or the like is converted to a Manchester code. It becomes easier to detect a synchronized waveform as a synchronized waveform.
- the detection method of the synchronization waveform is not necessarily as described above, and may be a detection method using a correlation output waveform by a matched filter, for example.
- FIG. 8A is a schematic diagram showing the position of the stylus pen 3 with respect to the touch panel 2 when the touch panel controller 10 is driving the touch panel 2 with a synchronization signal
- FIG. It is a schematic diagram which shows a position
- (c) is a schematic diagram which shows the further another position with respect to the touchscreen 2 of the stylus pen 3.
- Touch panel controller 10 is driven by the same synchronization signal drive lines DL 1 ⁇ DL L (synchronous waveform).
- the stylus pen 3 receives the synchronization signal through the pen tip 31 by the sense circuit 35 and the synchronization signal detection circuit 36 (FIG. 4).
- the said threshold value is predetermined by evaluation, such as experiment and simulation.
- the threshold value is a value that can be determined almost certainly that the stylus pen 3 is not touching the touch panel 2 and is determined to be a value that is as close to the touch panel 2 as possible. To do.
- FIG. 9 is a graph showing the relationship between the amplitude of the synchronization signal detected by the stylus pen 3 and the distance of the stylus pen 3 from the touch panel 2.
- the horizontal axis indicates the distance of the stylus pen 3 from the touch panel 2
- the vertical axis indicates the amplitude of the synchronization signal.
- the amplitude of the signal itself obtained by the pen tip 31 that can be detected in the sense circuit 35 is described as the amplitude of the synchronization signal.
- an expected synchronization waveform that can be detected in the synchronization signal detection circuit 36 is described.
- the peak level of the correlation between the received waveform and the actual received waveform may be treated as the amplitude of the synchronization signal.
- a threshold Ths corresponding to a distance d1 that is a distance that can be almost certainly determined that the stylus pen 3 is not touching the touch panel 2 and that is as close to the touch panel 2 as possible is displayed.
- the determination threshold is determined. If the amplitude of the synchronization signal is equal to or less than the threshold Ths, it can be reliably determined that there is no touch. Then, when the amplitude of the synchronization signal exceeds the threshold Ths, it is determined that there is a touch.
- a threshold Ths that is as large as possible can accurately determine the presence or absence of an actual touch, but is determined with emphasis on the certainty of determination of no touch.
- the range of the region As is a range in which the determination of no touch based on the amplitude of the synchronization signal is not very reliable.
- FIG. 10A is a schematic diagram for explaining the transition of the positional relationship of the stylus pen 3 with respect to the touch panel 2
- FIG. 10B is a graph showing the transition of the voltage from the writing pressure sensor 31 d provided in the stylus pen 3.
- C is a graph showing the transition of the amplitude of the synchronization signal detected by the stylus pen 3.
- the voltage corresponding to the pen pressure detected by the pen pressure sensor 31d and the amplitude of the synchronization signal corresponding to the distance of the stylus pen 3 from the touch panel 2 are as follows by the operation of the user of the stylus pen 3, respectively. To change.
- a voltage S11 having a voltage value V1 is output from the writing pressure sensor 31d of the stylus pen 3 that is away from the touch panel 2. Then, as the stylus pen 3 approaches the touch panel 2, the synchronization signal is detected by the stylus pen 3 at time t11, and the amplitude S12 of the synchronization signal increases after time t11. Next, at time t12, the amplitude S12 of the synchronization signal exceeds the threshold Ths, and it is determined that the stylus pen 3 has touched the touch panel 2. Thereafter, the stylus pen 3 actually touches the touch panel 2 at time t13, and the amplitude S2 of the synchronization signal reaches the amplitude value M1.
- the pen tip 31 moves in the axial direction toward the writing pressure sensor 31d.
- the voltage S11 output from the writing pressure sensor 31d decreases from the voltage value V1 to the voltage value V2.
- the amplitude S2 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 holds the position in the axial direction, and the voltage S11 of the sensor 31d holds the voltage V2.
- the amplitude S2 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 moves in the axial direction toward the direction away from the writing pressure sensor 31d, and the original position up to time t13 is changed. Go back beyond.
- the voltage S11 of the writing pressure sensor 31d increases to a voltage V3 that is higher than the original voltage V1 until time t13.
- the amplitude S12 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 holds the position returned beyond the original position, and the voltage S11 of the writing pressure sensor 31d. Holds the voltage value V3.
- the amplitude S12 of the synchronization signal starts to decrease from the amplitude value M1 and reaches the threshold value Ths, and it is determined that the stylus pen 3 has moved away from the touch panel 2.
- the amplitude S12 of the synchronization signal further decreases from the threshold Ths and reaches an amplitude value of zero at time t18.
- the stylus pen 3 is used in the period J1 and the period J2 where it is determined that the stylus pen 3 does not touch the touch panel 2 by the synchronization signal amplitude.
- the threshold value for touch presence determination applied to the voltage output from the writing pressure sensor 31d can be determined more accurately.
- This threshold value may be determined based on a value obtained by averaging the voltage of the writing pressure sensor 31d acquired a plurality of times in the period J1 and the period J2 in which it is determined that there is no touch in consideration of noise, or acquired a plurality of times. It may be determined based on a value obtained by filtering such as taking the minimum value of the voltage. In order to secure a margin, a threshold value slightly lower than the above threshold value may be set as the actual threshold value.
- Embodiment 2 The following describes Embodiment 2 of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.
- a threshold setting method described below may be introduced.
- FIG. 11A is a graph showing the transition of the voltage S13 from the writing pressure sensor 31d provided in the stylus pen 3 according to the second embodiment and the threshold value for determining the presence or absence of writing pressure by the writing pressure sensor 31d.
- (B) is a graph showing the transition of the amplitude S14 of the synchronization signal detected by the stylus pen 3.
- Threshold value Th1 A threshold value for determining that the stylus pen 3 has started touching the touch panel 2.
- the threshold value Th1 is the voltage value of the writing pressure sensor 31d during the period when it is determined that there is no touch based on the amplitude of the synchronization signal from the touch panel controller 10, and the writing pressure sensor 31d during the period when the writing pressure sensor 31d determines that there is no touch. Determined based on voltage value.
- Threshold Th2 A threshold for determining that a certain level of writing pressure has been applied. It is determined based on the lower limit value of the variation in the voltage value of the writing pressure sensor 31d obtained when the stylus pen 3 is not touching the touch panel 2.
- Threshold Th3 A threshold for determining that the voltage value of the writing pressure sensor 31d has not changed between the threshold Th1 and the threshold Th2 for a certain period of time.
- a voltage S13 having a voltage value V1 is output from the pen pressure sensor 31d of the stylus pen 3 that is away from the touch panel 2. Then, as the stylus pen 3 approaches the touch panel 2, the synchronization signal is detected by the stylus pen 3 at time t21, and the amplitude S14 of the synchronization signal increases after time t21. Next, at time t22, the amplitude S14 of the synchronization signal exceeds the threshold Ths, and it is determined that the stylus pen 3 has touched the touch panel 2. Thereafter, the stylus pen 3 actually touches the touch panel 2 at time t23, and the amplitude S14 of the synchronization signal reaches the amplitude value M1.
- the voltage S13 of the writing pressure sensor 31d falls below the threshold value Th2, and decreases to the voltage value V2 at time t24.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 holds the position in the axial direction, and the voltage S13 of the sensor 31d holds the voltage value V2.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 moves in the axial direction in a direction away from the writing pressure sensor 31d, and the original position until time t23 is moved. Go back beyond.
- the voltage S13 of the writing pressure sensor 31d exceeds the threshold Th1 at time t26, and it is determined that the touch on the touch panel 2 of the stylus pen 3 is lost by the threshold Th1.
- the voltage S13 of the writing pressure sensor 31d continues to increase until time t27, and reaches a voltage value V3 higher than the original voltage V1 until time t23.
- the stylus pen 3 moves away from the touch panel 2 at time t27, and the amplitude S14 of the synchronization signal starts decreasing from time t27.
- the threshold Th1 is updated based on the voltage value V3 of the voltage S13 of the writing pressure sensor 31d.
- the amplitude S14 of the synchronization signal continues to decrease.
- the amplitude S14 of the synchronization signal continues to decrease further until time t29.
- the stylus pen 3 maintains the distance from the touch panel 2 from time t29 to time t30, and the amplitude S14 of the synchronization signal maintains an amplitude value higher than the threshold Ths from time t29 to time t30.
- the stylus pen 3 starts to approach the touch panel 2 again, and the amplitude S14 of the synchronization signal reaches the amplitude value M1.
- the voltage S13 of the writing pressure sensor 31d starts to decrease from the voltage value V3.
- the voltage S13 of the writing pressure sensor 31d falls below the updated threshold value Th1. Thereby, it is determined that the touch of the stylus pen 3 on the touch panel 2 is started again.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1.
- the voltage S13 of the writing pressure sensor 31d decreases to a voltage value higher than the threshold value Th2 at time t32.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 holds the axial position, and the voltage S13 of the sensor 31d holds a voltage value higher than the threshold Th2.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1.
- the pen tip 31 moves in the axial direction in the direction away from the writing pressure sensor 31d, and reaches the original position from time t27. Return to the position where you can not return.
- the voltage S13 of the sensor 31d increases from time t33 to time t34 to a voltage value lower than the threshold value Th1.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1 until time t34.
- the stylus pen 3 moves away from the touch panel 2.
- the voltage S13 of the sensor 31d maintains a voltage value lower than the threshold value Th1.
- the amplitude S14 of the synchronization signal starts to decrease from the amplitude value M1, and reaches the threshold Ths at time t35. Thereby, it is determined that the touch on the touch panel 2 of the stylus pen 3 is lost.
- the threshold value Th1 is updated to a voltage value slightly lower than the voltage S13 of the sensor 31d.
- the stylus pen 3 is sufficiently separated from the touch panel 2, and the amplitude S14 of the synchronization signal reaches an amplitude value of zero.
- the stylus pen 3 starts to approach the touch panel 2 again, the amplitude S14 of the synchronization signal starts increasing at time t38, and exceeds the threshold Ths at time t39. Then, the amplitude S14 of the synchronization signal reaches the amplitude value M1.
- the stylus pen 3 is pushed into the touch panel 2, and the voltage S13 of the sensor 31d starts to decrease, and the voltage S13 of the sensor 31d falls below the threshold value Th1 at time t40. Thereby, it is determined that the touch of the stylus pen 3 on the touch panel 2 has been started three times.
- the voltage S13 of the writing pressure sensor 31d falls below the threshold value Th2, and decreases to a voltage value higher than the voltage value V2 at time t41.
- the amplitude S14 of the synchronization signal maintains the amplitude value M1.
- the voltage S13 of the writing pressure sensor 31d maintains a voltage value higher than the voltage value V2 until time t42. Thereafter, from time t42 to time t43, the writing pressure on the touch panel 2 of the stylus pen 3 decreases to zero, and the voltage S13 of the writing pressure sensor 31d increases to a voltage value lower than the threshold Th1.
- the stylus pen 3 starts to move away from the touch panel 2, and the amplitude S14 of the synchronization signal starts to decrease from the amplitude value M1.
- the threshold value Th1 is updated based on the voltage S13 of the sensor 31d.
- the amplitude S14 of the synchronization signal reaches the threshold value Ths at time t46, and decreases to an amplitude value lower than the threshold value Ths at time t47.
- the amplitude S14 of the synchronization signal is restored to the threshold Ths.
- the stylus pen 3 touches the touch panel, and the amplitude S14 of the synchronization signal reaches the amplitude value M1. Thereafter, when the stylus pen 3 is pushed into the touch panel, the voltage S13 of the sensor 31d starts to decrease. At time t49, the voltage S13 of the sensor 31d reaches the threshold value Th1. Accordingly, it is determined that the touch of the stylus pen 3 on the touch panel 2 has been started four times.
- the writing pressure further increases, and the voltage S13 of the sensor 31d decreases to a voltage value higher than the threshold value Th2 at time t50. Thereafter, the writing pressure is maintained from time t50 to time t51, and the voltage S13 of the sensor 31d maintains a voltage value higher than the threshold value Th2. Then, at time t51, the writing pressure of the stylus pen 3 starts to decrease, and the voltage S13 of the sensor 31d starts increasing.
- the voltage S13 of the sensor 31d exceeds the threshold Th1. Based on the threshold Th1, it is determined that the touch of the stylus pen 3 on the touch panel 2 is lost. Thereafter, at time t53, the voltage S3 of the sensor 31d reaches a voltage value higher than the voltage value from time t43. The stylus pen 3 starts to move away from the touch panel 2, and the amplitude S14 of the synchronization signal starts to decrease from the amplitude value M1.
- the threshold Th1 is updated based on a voltage value higher than the voltage value from time t43 of the voltage S13.
- the amplitude S14 of the synchronization signal decreases and reaches the threshold value Ths.
- the stylus pen 3 further moves away from the touch panel 2, and the amplitude S14 of the synchronization signal reaches an amplitude value of zero at time t56.
- a threshold Th3 is prepared.
- the voltage S13 of the sensor 31d is lower than the threshold value Th1, it is determined that there is a touch.
- the voltage S13 of the sensor 31d exceeds the threshold value Th2, there is a possibility that the above problem has occurred.
- the voltage S13 of the sensor 31d remains between the threshold Th1 and the threshold Th2, (1) a threshold for detecting that there is no voltage change, and (2) detecting that a certain time has elapsed.
- a threshold value is provided, and the threshold value Th1 is updated when there is no voltage change and a certain time has elapsed.
- the threshold value Th3 is a general expression of (1) the threshold value for detecting that there is no voltage change and (2) the threshold value for detecting that a certain time has elapsed.
- FIG. 12 is a schematic diagram illustrating a configuration of a touch panel system according to the third embodiment.
- the same components as those described in the above-described embodiment are denoted by the same reference numerals. Therefore, detailed description of these components will not be repeated.
- the threshold update circuit 40 that updates the threshold of the writing pressure sensor 31d based on the synchronization signal supplied from the touch panel controller 10 is provided inside the stylus pen 3.
- the present invention is not limited to this.
- the threshold update processing by the threshold update circuit 40 is performed by the touch signal (pen signal waveform S15 (FIGS. 13 to 15) on the touch panel controller 10 side. )
- the touch signal pen signal waveform S15 (FIGS. 13 to 15) on the touch panel controller 10 side.
- the place where the threshold update process is performed is preferably performed on the touch panel controller 10 side because the configuration of the stylus pen 3 is simplified. Of course, there is no problem in the processing itself even if the threshold update processing is performed inside the stylus pen 3.
- the present invention is not limited to this, and three or more operation switches may be provided in the stylus pen 3. Further, the number of signal lines connecting the stylus pen 3 and the touch panel controller 10 can be reduced by expressing the state of the operation switch and the voltage representing the writing pressure as a combined potential.
- the threshold update circuit 40 handles the output of the touch detection circuit 36 instead of the synchronization signal amplitude in the first and second embodiments.
- FIG. 13A is a schematic diagram for explaining the positional relationship between the touch panel 2 and the stylus pen 3 of the touch panel system according to the third embodiment
- FIG. 13B is a pen drive output by the stylus pen 3 of the touch panel system.
- It is a wave form diagram which shows pen signal waveform S15 obtained with the touch panel controller 10 with respect to a signal.
- FIG. 14A is a schematic diagram for explaining another positional relationship between the touch panel 2 and the stylus pen 3 of the touch panel system
- FIG. 14B is a touch panel for a pen drive signal related to the positional relationship.
- It is a wave form diagram which shows pen signal waveform S15 obtained with the controller 10.
- FIG. 15A is a schematic diagram for explaining still another positional relationship between the touch panel 2 and the stylus pen 3 of the touch panel system
- FIG. 15B is a diagram illustrating a pen driving signal related to the positional relationship
- 6 is a waveform diagram showing a pen signal waveform S15 obtained by the touch panel controller 10.
- the stylus pen 3 is wire-connected to the touch panel controller 10 through a signal line.
- the stylus pen 3 drives the pen tip 31 with a signal from the touch panel controller 10, and the touch panel controller 10 obtains a pen signal waveform S 15 through the touch panel 2.
- attention is paid to the amplitude of the pen signal waveform S15 obtained by the touch panel controller 10 through the touch panel 2.
- the amplitude of the pen signal waveform S15 obtained by the touch panel controller 10 through the touch panel 2 appears large. Then, as the stylus pen 3 moves away from the touch panel 2, the amplitude of the pen signal waveform S15 looks smaller.
- the threshold value of the pen signal waveform S15 is determined in advance by evaluation such as experiments and simulations.
- the threshold value of the pen signal waveform S15 is a value with which it can be determined with certainty that the stylus pen 3 has not touched the touch panel 2, and a value in a state where the stylus pen 3 is as close to the touch panel 2 as possible. Shall be determined.
- FIG. 16 is a graph showing the relationship between the amplitude of the pen signal waveform S15 obtained by the touch panel controller 10 through the touch panel 2 and the distance of the stylus pen 3 from the touch panel 2 with respect to the pen drive signal output from the stylus pen 3.
- the horizontal axis indicates the distance of the stylus pen 3 from the touch panel 2
- the vertical axis indicates the amplitude of the pen signal waveform S15.
- a threshold Thd corresponding to a distance d2 that is a distance that can be almost certainly determined that the stylus pen 3 is not touching the touch panel 2 and that is as close to the touch panel 2 as possible is displayed.
- the determination threshold is determined. If the amplitude of the pen signal waveform S15 is equal to or less than the threshold value Thd, it can be reliably determined that there is no touch. Then, when the amplitude of the pen signal waveform S15 exceeds the threshold Thd, it is determined that there is a touch.
- a threshold Thd that is as large as possible can accurately determine the presence or absence of a touch, but is determined with an emphasis on the certainty of determination of the presence or absence of a touch.
- the range of the region Ad is a range in which the determination of the presence or absence of touch based on the amplitude of the pen signal waveform S15 is not very reliable.
- FIG. 17 is a block diagram illustrating a configuration of the mobile phone 60 according to the fourth embodiment.
- the mobile phone 60 of the present embodiment includes a touch panel system 1, a display panel 61, operation keys 62, a speaker 63, a microphone 64, a camera 65, a CPU 66, a ROM 67, A RAM 68 and a display control circuit 69 are provided. Each component is connected to each other by a data bus.
- the touch panel system 1 includes the touch panel 2, the touch panel controller 10 that detects a capacitance or a capacitance difference, and the stylus pen 3.
- the display panel 61 displays images stored in the ROM 67 and the RAM 68 by the display control circuit 69.
- the display panel 61 is superimposed on the touch panel 2 or has the touch panel 2 incorporated therein.
- the touch recognition signal generated by the touch recognition unit 17 and indicating the touch position on the touch panel 2 can have the same role as the signal indicating that the operation key 62 has been operated.
- the operation key 62 receives an instruction input by the user of the mobile phone 60.
- the speaker 63 outputs a sound based on, for example, music data stored in the RAM 68.
- the microphone 64 receives user's voice input.
- the mobile phone 60 digitizes the input voice (analog data). Then, the cellular phone 60 sends the digitized voice to a communication partner (for example, another cellular phone).
- a communication partner for example, another cellular phone.
- the camera 65 shoots a subject in accordance with the operation of the operation key 62 by the user.
- image data of the photographed subject is stored in the RAM 68 or an external memory (for example, a memory card).
- CPU 66 controls the operation of touch panel system 1 and mobile phone 60.
- the CPU 66 executes a program stored in the ROM 67, for example.
- the ROM 67 stores data in a nonvolatile manner.
- the ROM 67 is a ROM capable of writing and erasing, such as an EPROM (Erasable Programmable Read-Only Memory) and a flash memory.
- EPROM Erasable Programmable Read-Only Memory
- the mobile phone 60 may be configured to include an interface (IF) for connecting to another electronic device by wire.
- IF interface
- the RAM 68 stores data generated by executing the program by the CPU 66 or data input via the operation keys 62 in a volatile manner.
- the mobile phone 60 as the electronic apparatus in the present embodiment includes the touch panel system 1.
- the mobile telephone 60 as an electronic device provided with the touch panel system 1 in which the sensitivity of the stylus pen 3 to the touch panel 2 is stable can be provided.
- the control block (especially the threshold update circuit 40 and the control circuit 33) of the stylus pen 3 and the threshold update circuit 40 of the touch panel controller 10 are realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. Alternatively, it may be realized by software using a CPU (Central Processing Unit).
- a logic circuit hardware
- IC chip integrated circuit
- CPU Central Processing Unit
- the threshold update circuit 40 and the like include a CPU that executes instructions of a program that is software that implements each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU) ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like.
- a computer or CPU
- the recording medium a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
- the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
- a transmission medium such as a communication network or a broadcast wave
- the present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
- a touch panel system 1 is a touch panel system 1 for detecting a position on a touch panel 2 of a touch pen (stylus pen 3) touching a touch panel 2, and the touch pen (stylus pen 3) is a brush.
- a pen tip 31 provided so as to be movable in the axial direction according to pressure, and a writing pressure sensor 31d that generates a signal corresponding to the amount of movement of the pen tip 31, and includes a touch pen (stylus pen 3) and the touch panel 2.
- a threshold update circuit 40 is provided for updating a threshold for determining the presence or absence of the pen pressure by the pen pressure sensor 31d.
- the threshold for determining the presence or absence of writing pressure by the writing pressure sensor 31d is updated. For this reason, the threshold value of the writing pressure sensor 31d can be updated each time the stylus pen 3 is pushed into the touch panel 2 and released. Therefore, even if the return position of the pen tip 31 varies every time the stylus pen 3 is pushed into the touch panel 2 and released, the threshold value can be updated each time the return position of the pen tip 31 varies. As a result, even if the return position of the pen tip 31 varies every time the stylus pen 3 is pushed into the touch panel 2 and released, the sensitivity of the stylus pen 3 to the touch panel 2 can be stabilized.
- the touch panel 2 includes a plurality of first signal lines (horizontal signal lines HL 1 to HL K ) and a plurality of second signal lines (vertical signal lines VL 1). To VL L ), capacitors are respectively formed at the intersections, and further includes a control unit (touch panel controller 10) for controlling the touch panel 2, and the control unit (touch panel controller 10) is configured to operate the touch pen (stylus pen 3).
- the first signal line is driven in a synchronization period by a synchronization signal for synchronizing the operation of the control unit (touch panel controller 10), and the touch pen (stylus pen 3) detects a synchronization circuit (sense circuit 35).
- the synchronization signal detection circuit 36), and the threshold update circuit 40 is based on the amplitude of the synchronization signal.
- the threshold of the writing pressure sensor 31d may be updated.
- the threshold value of the writing pressure sensor 31d can be updated using a synchronization signal for synchronizing the operation of the stylus pen 3 and the operation of the touch panel controller 10.
- the touch panel 2 includes a plurality of first signal lines (horizontal signal lines HL 1 to HL K ) and a plurality of second signal lines (vertical signal lines VL 1). Capacitors are respectively formed at the intersections with VL L ), and further includes a control unit (touch panel controller 10) for controlling the touch panel 2, and the control unit (touch panel controller 10) is a touch pen (stylus pen 3) during the driving period.
- the first signal line is driven by a drive signal for detecting the position of the touch panel 2 on the touch panel 2, and a touch pen (stylus pen 3) drives the first signal line by a pen drive signal during the drive period.
- Drive circuit 38 and the threshold update circuit 40 passes the touch panel 2 to the pen drive signal. Based on the amplitude of the pen signal waveform obtained Te, it may update the threshold of the writing pressure sensor 31d.
- the threshold value of the pen pressure sensor 31d can be updated using a pen drive signal for driving the drive line during the drive period.
- the threshold update circuit 40 may be provided in the touch pen (stylus pen 3).
- the configuration of the touch panel controller 10 is simplified.
- the touch panel system according to aspect 5 of the present invention may further include a control unit (touch panel controller 10) for controlling the touch panel 2 in aspect 1, and the threshold update circuit 40 may be provided in the control unit (touch panel controller 10). .
- the configuration of the stylus pen 3 is simplified.
- the present invention can be used for a touch panel system for detecting a position on a touch panel of a touch pen that touches the touch panel, and an electronic device including the touch panel system.
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Abstract
Description
以下、本発明の実施の形態について、図1~図10に基づいて説明すれば、以下のとおりである。
本実施の形態のタッチパネルシステム1の構成について、図1及び図2に基づいて説明する。図1は本実施の形態のタッチパネルシステム1の構成を示すブロック図であり、図2はタッチパネルシステム1に設けられたタッチパネル2の構成を示す配線図である。
上記構成のタッチパネルシステム1におけるスタイラスペン3のタッチ位置の検出動作について、以下に経時的に説明する。尚、ここでは、スタイラスペン3を単にタッチペンとして使用する場合の検出動作について説明する。
本実施の形態のスタイラスペン3は、例えば、筆圧を検知するための筆圧センサ31dを有しており、この筆圧センサ31dから筆圧信号は、タッチパネルコントローラ10と同期を取りながら出力されるようになっている。
ところで、本実施の形態のスタイラスペン3は、無線にてタッチパネルコントローラ10と信号の送受信を行っている。したがって、タッチパネルコントローラ10におけるドライブラインDL1~DLLの駆動のタイミングに合うようにドライブラインDLL+1を駆動するのと同じパターンでペン先31を駆動する。そこで、スタイラスペン3では、ドライブ回路38を設けてタッチパネルコントローラ10のドライバ12と同様に駆動を行うようにしている。
図6(a)はタッチパネルコントローラ10におけるドライバ12のドライブライン及びセンスアンプ13のセンスラインにおけるタッチパネル2及びスタイラスペン3への出力関係を示す図であり、(b)は同期波形とタッチ検出用波形とを示す波形図である。図7(a)はタッチパネルコントローラ10が同期信号によりタッチパネル2を駆動する態様を示す模式図であり、(b)はタッチパネルコントローラ10がスタイラスペン3の位置を検出するための駆動信号によりタッチパネル2を駆動する態様を示す模式図である。
図8(a)はタッチパネルコントローラ10が同期信号によりタッチパネル2を駆動しているときのスタイラスペン3のタッチパネル2に対する位置を示す模式図であり、(b)はスタイラスペン3のタッチパネル2に対する他の位置を示す模式図であり、(c)はスタイラスペン3のタッチパネル2に対するさらに他の位置を示す模式図である。
図9は、スタイラスペン3が検出する同期信号の振幅とスタイラスペン3のタッチパネル2からの距離との関係を示すグラフである。横軸はスタイラスペン3のタッチパネル2からの距離を示し、縦軸は同期信号の振幅を示す。スタイラスペン3がタッチパネル2にタッチし、スタイラスペン3のタッチパネル2からの距離が零であると、同期信号の振幅は振幅Msとなる。同期信号の振幅は、曲線Csに示されるようにスタイラスペン3のタッチパネル2からの距離が増大するに従って減少する。また、ここではセンス回路35内で検知可能な、ペン先31で得られる信号そのものの振幅を同期信号の振幅として扱う記載としているが、同期信号検出回路36内で検知可能な、期待する同期波形と実際の受信波形との相関のピークレベルを同期信号の振幅として扱ってもよい。
図10(a)はスタイラスペン3のタッチパネル2に対する位置関係の推移を説明するための模式図であり、(b)はスタイラスペン3に設けられた筆圧センサ31dからの電圧の推移を示すグラフであり、(c)はスタイラスペン3が検出する同期信号の振幅の推移を示すグラフである。
本発明の実施形態2について、図11に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
閾値Th1:スタイラスペン3がタッチパネル2へのタッチを開始したことを判定するための閾値である。閾値Th1は、タッチパネルコントローラ10からの同期信号の振幅によりタッチ無しと判定された期間における筆圧センサ31dの電圧値、及び、筆圧センサ31dによりタッチ無しと判定された期間における筆圧センサ31dの電圧値に基づいて定める。
閾値Th2:ある程度筆圧がかけられたことを判断するための閾値である。スタイラスペン3がタッチパネル2にタッチしていないときに得られる筆圧センサ31dの電圧値のばらつきの下限値に基づいて定める。
閾値Th3:筆圧センサ31dの電圧値が一定時間、閾値Th1と閾値Th2との間で変化していないことを判定するための閾値である。
図12は、実施形態3に係るタッチパネルシステムの構成を示す模式図である。前述した実施形態で説明した構成要素と同一の構成要素には同一の参照符号を付している。従って、これらの構成要素の詳細な説明は繰り返さない。
本発明のさらに他の実施の形態について図17に基づいて説明すれば、以下のとおりである。尚、本実施の形態において説明すること以外の構成は、前記実施形態1から3と同じである。また、説明の便宜上、前記の実施形態1から3の図面に示した部材と同一の機能を有する部材については、同一の符号を付し、その説明を省略する。
スタイラスペン3の制御ブロック(特に閾値更新回路40および制御回路33)、及び、タッチパネルコントローラ10の閾値更新回路40は、集積回路(ICチップ)等に形成された論理回路(ハードウェア)によって実現してもよいし、CPU(Central Processing Unit)を用いてソフトウェアによって実現してもよい。
本発明の態様1に係るタッチパネルシステム1は、タッチパネル2にタッチしたタッチペン(スタイラスペン3)のタッチパネル2上の位置を検出するためのタッチパネルシステム1であって、タッチペン(スタイラスペン3)は、筆圧に応じて軸方向に移動可能に設けられたペン先31と、ペン先31の移動量に応じた信号を生成する筆圧センサ31dとを有し、タッチペン(スタイラスペン3)とタッチパネル2との間の距離に基づいて、筆圧の有無を筆圧センサ31dにより判定するための閾値を更新する閾値更新回路40を設けている。
2 タッチパネル
3 スタイラスペン(タッチペン)
10 タッチパネルコントローラ(制御部)
11 マルチプレクサ
12 ドライバ
13 センスアンプ
14 タイミングジェネレータ
15 AD変換器
16 容量分布計算部
17 タッチ認識部
18 ペン位置検出部
30 ペン本体
30a 把持部
31 ペン先
31a ペン先カバー
31b ペン先軸
31c 絶縁体
31d 筆圧センサ
32 接続スイッチ
33 制御回路
34a・34b 動作切替スイッチ
35 センス回路(同期回路)
36 同期信号検出回路(同期回路)
37 タイミング調整回路
38 ドライブ回路(ペン駆動回路)
39a 第1操作スイッチ
39b 第2操作スイッチ
60 携帯電話機(電子機器)
61 表示パネル
62 操作キー
63 スピーカ
64 マイクロフォン
65 カメラ
66 CPU
67 ROM
68 RAM
69 表示制御回路
C11~CKL キャパシタ
DL1~DLK~DLL ドライブライン
HL1~HLK 水平信号線(第1信号線、第2信号線)
SL1~SLK~SLL センスライン
VL1~VLK~VLL 垂直信号線(第1信号線、第2信号線)
Claims (5)
- タッチパネルにタッチしたタッチペンの前記タッチパネル上の位置を検出するためのタッチパネルシステムであって、
前記タッチペンは、筆圧に応じて軸方向に移動可能に設けられたペン先と、前記ペン先の移動量に応じた信号を生成する筆圧センサとを有し、
前記タッチペンと前記タッチパネルとの間の距離に基づいて、前記筆圧の有無を前記筆圧センサにより判定するための閾値を更新する閾値更新回路を設けたことを特徴とするタッチパネルシステム。 - 前記タッチパネルには、複数の第1信号線と複数の第2信号線との交点にキャパシタがそれぞれ形成されており、
前記タッチパネルを制御する制御部をさらに備え、
前記制御部は、前記タッチペンの動作と前記制御部の動作とを同期させるための同期信号により同期期間において前記第1信号線を駆動し、
前記タッチペンは、前記同期信号を検出する同期回路をさらに有し、
前記閾値更新回路は、前記同期信号の振幅に基づいて、前記筆圧センサの前記閾値を更新する請求項1に記載のタッチパネルシステム。 - 前記タッチパネルには、複数の第1信号線と複数の第2信号線との交点にキャパシタがそれぞれ形成されており、
前記タッチパネルを制御する制御部をさらに備え、
前記制御部は、駆動期間において前記タッチペンの前記タッチパネル上の位置を検出するための駆動信号により前記第1信号線を駆動し、
前記タッチペンは、前記駆動期間に前記第1信号線をペン駆動信号により駆動するペン駆動回路をさらに有し、
前記閾値更新回路は、前記ペン駆動信号に対して前記タッチパネルを通して得られるペン信号波形の振幅に基づいて、前記筆圧センサの前記閾値を更新する請求項1に記載のタッチパネルシステム。 - 前記閾値更新回路は前記タッチペンに設けられる請求項1に記載のタッチパネルシステム。
- 請求項1に記載のタッチパネルシステムを備えた電子機器。
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