WO2015137053A1 - Appareil de détection de position - Google Patents

Appareil de détection de position Download PDF

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Publication number
WO2015137053A1
WO2015137053A1 PCT/JP2015/054208 JP2015054208W WO2015137053A1 WO 2015137053 A1 WO2015137053 A1 WO 2015137053A1 JP 2015054208 W JP2015054208 W JP 2015054208W WO 2015137053 A1 WO2015137053 A1 WO 2015137053A1
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WIPO (PCT)
Prior art keywords
circuit
signal
stylus
electrodes
selection circuit
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PCT/JP2015/054208
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English (en)
Japanese (ja)
Inventor
勇次 桂平
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株式会社ワコム
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Publication of WO2015137053A1 publication Critical patent/WO2015137053A1/fr

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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
    • 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
    • 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
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means

Definitions

  • the present invention relates to a transparent position detection device that can be placed on the front surface of a display device and can be input with a stylus.
  • a resonance circuit is provided in a position indicator, which is a stylus, and an indication position is detected by electromagnetic induction with the tablet.
  • a sensor plate constituting the tablet it is necessary to provide a sensor plate constituting the tablet on the back surface of the display device. there were. This is because the sensor cannot be made transparent because a certain amount of current needs to flow through the loop coil constituting the sensor plate. For this reason, the sensors constituting the tablet cannot be used in common with the sensors for touch detection with a finger, and there are problems such as an increase in cost and a complicated structure of the device. Also, the electrostatic touch detection and the electromagnetic induction stylus detection require separate processing circuits, resulting in a complicated circuit configuration.
  • Patent Document 2 Japanese Patent Laid-Open No. 2007-164356 by the same applicant as Patent Document 1
  • an electric double layer capacitor is mounted on the stylus.
  • the tablet sensor can be made transparent and arranged on the entire surface of the display device.
  • the invention disclosed in Patent Document 2 has a problem that the coordinate position cannot be obtained stably due to noise generated by the display device.
  • Patent Document 3 Japanese Patent Publication No. 2005-537570 discloses a “transparent digitizer that obtains the indicated position of a stylus based on a signal from a differential amplifier arranged in association with each electrode of a transparent sensor disposed on a display device. Is disclosed. According to the transparent digitizer of Patent Document 3, two electrodes are simultaneously selected from the transparent sensor to detect a signal difference, and thus are not easily affected by external noise.
  • Patent Document 4 Japanese Patent Laid-Open No. 6-337752 is provided with an analog multiplexer that selects two from the electrode lines of the tablet, and the signals from the two selected thereby are differentially amplified.
  • an analog multiplexer that selects two from the electrode lines of the tablet, and the signals from the two selected thereby are differentially amplified.
  • Patent Document 5 Japanese Patent Laid-Open No. 2013-97469
  • a touch panel that is not affected by noise by alternately performing a period for driving the touch panel and a period for driving the display device. Is disclosed.
  • the resistance value of the conductive material constituting the electrode is high, and the display device itself generates strong noise, so that it is difficult to stably determine the coordinate position of the stylus.
  • noise generated by a display device such as a liquid crystal panel is extremely strong compared to a signal transmitted from a stylus, it is difficult to sufficiently eliminate the influence of noise only by using a differential amplifier.
  • touch detection is performed during a period in which driving of the display device is stopped, but this is limited to a passive conductor such as a finger, The position of the active stylus that emits the signal cannot be determined.
  • An object of the present invention is to provide a position detection device capable of accurately detecting and inputting the coordinate position of a stylus using a transparent sensor arranged integrally with the display device without being affected by noise generated by the display device. It is to provide.
  • the first electrode and the second electrode are arranged on the display device.
  • a substantially transparent sensor composed of a plurality of electrodes, a first selection circuit for selecting two sets of electrodes as a positive end and a negative end from among the first electrodes, and from among the second electrodes
  • a second selection circuit that selects two sets of electrodes as a positive end and a negative end, and a signal generated at the positive end and the negative end selected by one or each of the first selection circuit and the second Y selection circuit
  • a differential amplifier for amplifying the difference between them and an analog-digital conversion circuit for detecting the level of a signal output from the differential amplifier in the same cycle as a horizontal synchronizing pulse of a display device and converting it into a digital signal
  • a transparent position detecting apparatus comprising a.
  • the analog-to-digital conversion circuit alternately provides a reception period in which a signal is sampled and a reception stop period in which the signal is not sampled, and a horizontal synchronization pulse of the display device is in the reception stop period. It is characterized by.
  • the stylus includes a writing pressure detection circuit that detects and digitizes writing pressure, and an ASK that changes an AC signal applied to the electrode in time series based on digital information output from the writing pressure detection circuit.
  • a transparent position detector with (Amplitude Shift ⁇ ⁇ Keying) modulation circuit We propose a transparent position detector with (Amplitude Shift ⁇ ⁇ Keying) modulation circuit.
  • two sets of receiving electrodes are simultaneously selected and a differential amplifier circuit is used to detect a difference between signals induced to these electrodes, and at the same cycle as the horizontal synchronizing pulse of the display device.
  • the noise of the display device is not mixed at the timing when the signal is detected and converted from analog to digital, and the coordinate position of the stylus can be accurately detected without being affected by the noise generated by the display device. it can.
  • the reception signal is not supplied to the band-pass filter circuit during the period in which the display device generates noise due to the horizontal synchronization pulse.
  • the coordinate position of the stylus can be accurately detected without being affected by noise.
  • the writing pressure information of the stylus is transmitted by ASK modulation, it becomes possible to use a band-pass filter circuit having a narrow bandwidth on the position detecting device side, and is affected by noise from the display device.
  • the coordinate position can be detected stably without any problem.
  • FIG. 4 is a diagram illustrating received signal waveforms and analog-to-digital conversion operation timings in each unit of FIG. 3. It is the figure which showed the example of the internal structure of the stylus used with embodiment of the position detection apparatus by this invention.
  • FIG. 6 is a diagram illustrating a circuit example of a stylus in the example of FIG. 5.
  • FIG. 7 is a signal waveform diagram in the circuit example of the stylus in FIG. 6.
  • FIG. 7 is a signal waveform diagram in the circuit example of the stylus in FIG. 6 and the position detection device in FIG.
  • FIG. 1 is a diagram showing a configuration of a transparent sensor combined with a display unit in an embodiment of a position detection device according to the present invention.
  • 11 is an LCD (Liquid Crystal Display) panel
  • 12 is a transparent sensor having electrodes formed of ITO (Indium Tin Oxide).
  • 12a is ITO glass in which a plurality of X electrodes 12d made of ITO electrode lines are arranged in the X direction out of the X and Y directions perpendicular to each other.
  • 12b is ITO glass in which a plurality of Y electrodes 12e made of ITO electrode lines are arranged in the Y direction.
  • 12c is a transparent insulating sheet having a uniform thickness, and is made of, for example, a PET (Polyethylene terephthalate) film.
  • the transparent sensor 12 is made by adhering the ITO glass 12a and the ITO glass 12b with the ITO surfaces facing each other and with a transparent insulating sheet 12c interposed therebetween.
  • the transparent sensor 12 is disposed so as to overlap the LCD panel 11 so that the position detection area just overlaps the display area of the LCD panel 11.
  • the X electrode 12d on the ITO glass 12a and the Y electrode 12e on the ITO glass 12b are connected to a printed circuit board (not shown) via a flexible board (not shown) by ACF (Anisotropic conductive film) connection.
  • FIG. 2 is a cross-sectional view of the transparent sensor 12 cut on the Y electrode 12e.
  • the ITO glass 12a side is the operation surface side, and the surface exposed to the outside of the ITO glass 12a is the touch surface 12f.
  • FIG. 3 is a configuration diagram of an embodiment of a position detection device according to the present invention.
  • 12 is a transparent sensor
  • 13 is an X selection circuit which is connected to the X electrode 12d of the transparent sensor 12 and selects two sets of electrodes from the X electrode 12d as a + end and a ⁇ end
  • 14 is a transparent sensor 12
  • This is a Y selection circuit that is connected to the Y electrode 12e and selects two sets of electrodes from the Y electrode 12e as a + end and a ⁇ end.
  • 40 X electrodes 12d (X1 to X40)
  • 30 Y electrodes 12e Y1 to Y30) are used.
  • Numeral 15 is a stylus, and a signal of a constant frequency is supplied between the tip electrode and the outer peripheral electrode surrounding it.
  • the 16 is a switching circuit which selects either the + end and ⁇ end selected by the X selection circuit 13 or the + end and ⁇ end selected by the Y selection circuit 14 and connects to the differential amplifier circuit 17. That is, when the X-axis coordinate of the position indicated by the stylus 15 is obtained, the control signal a from the control circuit 18 is set to the low level “0” and the X selection circuit 13 side is selected. When obtaining the Y-axis coordinate of the position indicated by the stylus 15, the control signal a is set to the high level “1” and the Y selection circuit 14 side is selected.
  • the + end side of the X selection circuit 13 or the Y selection circuit 14 is connected to the non-inverting input terminal (+ side) of the differential amplifier circuit 17, and the ⁇ end side of the X selection circuit 13 or the Y selection circuit 14. Is connected to the inverting input terminal ( ⁇ side) of the differential amplifier circuit 17.
  • the switch 19 is a band-pass filter circuit having a predetermined bandwidth centered on the signal frequency output from the stylus 15, and an output signal from the differential amplifier circuit 17 is supplied through the switch 20.
  • the switch 20 is controlled to be on or off by a control signal b from the control circuit 18. That is, when the control signal b is at the high level “1”, the switch 20 is turned on, the output signal from the differential amplifier circuit 17 is supplied to the band pass filter circuit 19, and when the control signal b is at the low level “0”. The switch 20 is turned off, and the output signal from the differential amplifier circuit 17 is not supplied to the band-pass filter circuit 19.
  • the output signal of the bandpass filter circuit 19 is detected by a detection circuit 21 and converted into a digital value by an analog-digital conversion circuit (hereinafter abbreviated as an AD conversion circuit) 22 based on a control signal c from the control circuit 18.
  • the digital data d from the AD conversion circuit 22 is read and processed by a microprocessor (MCU) 23.
  • MCU microprocessor
  • the period in which the switch 20 is on is a reception period in which sampling is performed by the AD conversion circuit 22 and converted into a digital signal, and the period in which the switch 20 is off is not sampled by the AD conversion circuit 22.
  • the reception stop period is entered, and the reception period and the reception stop period alternate between the ON state and the OFF state of the switch 20.
  • the control circuit 18 supplies the control signal e to the X selection circuit 13, so that the X selection circuit 13 selects two sets of X electrodes as + end and -end. Further, the control circuit 18 supplies the control signal f to the Y selection circuit 14, so that the Y selection circuit 14 selects two sets of Y electrodes as + end and -end.
  • the microprocessor 23 includes a ROM (Read Only Memory) and a RAM (Random Access Memory), and operates according to a program stored in the ROM.
  • ROM Read Only Memory
  • RAM Random Access Memory
  • the microprocessor 23 controls the control circuit 18 by outputting a control signal g based on a program stored in the ROM so that the control circuit 18 outputs the control signals a to f at a predetermined timing.
  • a horizontal synchronization pulse h synchronized with the display refresh timing is supplied from the LCD panel 11 to the control circuit 18 and the microprocessor 23, and the overall operation of the position detection device is the period of the horizontal synchronization pulse h. This is performed at Ph (see FIG. 4).
  • FIG. 4 is a diagram showing the received signal waveform and AD conversion operation timing of the position detection device when the X selection circuit 13 or the Y selection circuit 14 selects an electrode close to the stylus 15.
  • h, b, j, k, c, and d are signal waveforms at locations indicated by the same reference numerals in FIG. Note that j is an output signal waveform of the differential amplifier circuit 17, and k is an output signal waveform of the detector circuit 21.
  • a feature of this embodiment is that signal detection (AD conversion) is performed while avoiding noise from the LCD panel 11.
  • the control circuit 18 synchronizes with the horizontal synchronizing pulse h based on the horizontal synchronizing pulse h from the LCD panel 11 and becomes a low level in a period including the pulse width period of the horizontal synchronizing pulse h. Is generated. Then, the control circuit 18 turns off the switch 20 in a period including the pulse width period of the horizontal synchronization pulse h at the timing synchronized with the horizontal synchronization pulse h by the control signal b. As a result, noise appearing at the output of the differential amplifier circuit 17 is not input to the bandpass filter circuit 19, so that the conversion result d by the AD conversion circuit 22 is not affected by noise.
  • Noise generated from a display device such as the LCD panel 11 is generally pulsed. However, when such pulsed noise is input to the band-pass filter circuit 19, the effect remains for a long time after the pulse ends. Therefore, in this embodiment, when noise appears, the signal is prevented from entering the band pass filter circuit 19.
  • FIG. 5 shows an example of the internal structure of the stylus 15 used in this embodiment.
  • a lead 30 is provided at the tip, and an electrode 31 is embedded in the lead 30.
  • a shield electrode 32 is provided on the outer periphery excluding the tip of the lead 30 so as to surround the lead 30.
  • the shield electrode 32 is connected to a portion (GND; ground electrode) where the potential is most stable in the circuit.
  • the shield electrode 32 has an effect of preventing the detected coordinate value from being shifted even when the stylus is inclined on the transparent sensor 12.
  • 34 is a variable capacitance capacitor that is physically coupled to the lead 30 and whose capacitance is changed by the pen pressure applied through the lead 30.
  • 34 is a printed circuit board, and 35 is a battery.
  • the printed circuit board 34 is provided with an oscillation circuit that oscillates at a constant frequency, and the oscillation output is supplied to the electrode 31.
  • the writing pressure applied to the variable capacitor 33 is binary-coded by an operation described later, and outputs an ASK modulated signal by controlling the oscillation circuit.
  • the printed circuit board 34 is also provided with an ASK modulation circuit for this purpose.
  • FIG. 6 shows an example of the circuit of the stylus 15. 6 that are the same as those in FIG. 5 are denoted by the same symbols.
  • 31 is an electrode provided at the tip of the stylus 15, 35 is a battery, and 33 is a variable capacitor whose capacity changes with writing pressure.
  • the carp L1, the capacitor C1, and the capacitor C2 constitute a part of the oscillation circuit, and this oscillation output is induced to the coil L2 coupled to the coil L1 and supplied to the electrode 31.
  • reference numeral 36 denotes a CPU which operates according to a predetermined program.
  • the control signal p from the output terminal P1 of the CPU 36 is connected to the above-described oscillation circuit, and controls the oscillation to be started or stopped.
  • the oscillation circuit stops oscillation when the control signal p is at the low level “0”, and oscillates when the control signal p is at the high level “1”.
  • the variable capacitor 33 is connected in parallel with the resistor and is connected to the terminal P2 of the CPU. The operation of the stylus will be described with the signal at the P2 terminal as q and the signal supplied to the electrode 31 as r.
  • FIG. 7 shows the waveforms of the signals p, q, and r in FIG.
  • the CPU 36 maintains the output of the signal p at the high level “1” for a certain period and continues the operation of the oscillation circuit. During this period, the position detection apparatus performs a coordinate detection operation described later. Further, the CPU 36 detects the writing pressure applied to the variable capacitor 33 during the continuous transmission period in which the signal p is at the high level “1”. In order to detect the writing pressure, the CPU 36 sets the terminal P2 to the high level “1” output after starting the above-described continuous transmission. As a result, the signal q becomes high level “1”, and the variable capacitor 33 is charged to the voltage of the battery 35.
  • the CPU 36 sets the terminal P2 to the input setting, that is, the high impedance setting.
  • the charge charged in the variable capacitor 33 is discharged by a resistor connected in parallel with the variable capacitor 33, so that the signal q, that is, the voltage at the terminal P2 gradually decreases.
  • the internal logic becomes low level.
  • the CPU 36 measures the time from when the terminal P2 is switched to the input setting until the voltage at the terminal P2 reaches the threshold value or less as Tp (see FIG. 7). Since the time Tp varies depending on the capacitance of the variable capacitor 33, that is, the magnitude of the writing pressure, the CPU 36 obtains the time Tp measured in the range from zero to the maximum writing pressure as a 10-bit digital value.
  • the CPU 36 performs ASK modulation by controlling the terminal P1 according to the 10-bit writing pressure data. That is, the terminal P1 is set to the low level when the data is “0”, and is set to the high level when the data is “1”.
  • the start data (Start signal) which is the first data is always transmitted as “1”. This is because the microprocessor 23 can accurately predict the timing of subsequent data.
  • time Td is a cycle for transmitting 1-bit data. As illustrated in FIG. 8, the period Td is preferably sufficiently longer than the period Ph of the horizontal synchronization pulse h of the LCD panel 11.
  • FIG. 8 shows a signal p and a signal r on the stylus 15 side, an output signal of the transparent sensor 12 on the position detection device side, a horizontal synchronization pulse h, and a control signal c (AD conversion timing signal) supplied to the AD conversion circuit 22. It is an enlarged view which shows the relationship in the period of 1 period Td about.
  • the output signal from the sensor 12 is converted into a digital signal by the AD conversion circuit 22 based on a control signal c synchronized with a horizontal synchronization pulse h having a period sufficiently shorter than the period Td. .
  • the switch 20 is turned off as a reception stop period in a period in which noise generated in synchronization with the horizontal synchronization pulse h is included by the control signal b generated based on the horizontal synchronization pulse h.
  • the AD conversion circuit 22 converts the signal into a digital signal based on the control signal c. Therefore, as described above, the noise generated in synchronization with the horizontal synchronization pulse h is not supplied to the AD conversion circuit 22, and the influence is removed.
  • FIG. 9 shows the X-axis full scan operation. Specifically, the X-axis full scan operation for obtaining the approximate position where the stylus 15 is placed is shown by the X selection circuit 13 sequentially selecting all the X electrodes and receiving signals.
  • the microprocessor 23 outputs a control signal g to the control circuit 18, the switching circuit 16 selects the X side, the X electrode X1 as the + end side of the X selection circuit 13, and the X electrode X6 as the-end side. Are controlled to be selected respectively.
  • the level of the signal received from the selected X electrodes X1 and X6 is obtained by performing reception and AD conversion operations at the timing shown in FIG.
  • the microprocessor 23 performs control so that the number of the electrode selected by the X selection circuit 13 is incremented by 1 and the X electrode X2 is selected as the + end side and the X electrode X7 is selected as the ⁇ end side. In this state, the signal level is obtained in the same manner as described above.
  • the microprocessor 23 obtains the signal level while sequentially incrementing the number of the X electrode selected by the X selection circuit 13 until the selection at the + end side becomes the X electrode X35 and the selection at the ⁇ end side becomes the X electrode X40. Do. At this time, the selection of the X electrode in the X selection circuit 13 is switched in synchronization with the horizontal synchronization pulse h by the control signal e from the control circuit 18.
  • FIG. 9 shows a case where the stylus 15 is placed in the vicinity of the X electrode X11 of the transparent sensor 12.
  • the signal level peaks.
  • the approximate position of the stylus 15 can be obtained from the distribution of the signal level when the selection of the X electrode is updated. If it is found from the signal level distribution of FIG. 9 that the stylus 15 is placed in the vicinity of the X electrode X11, a transition operation to the partial scan is performed next.
  • FIG. 10 shows an operation for shifting to partial scanning.
  • the timing when the stylus 15 becomes the continuous transmission period in FIG. 7 is detected, and the approximate position of the stylus 15 in the transparent sensor 12 in the Y direction is obtained.
  • the microprocessor 23 outputs a control signal g to the control circuit 18, the switching circuit 16 selects the X side, the X electrode X11 is used as the + end side of the X selection circuit 13, and the X electrode X16 is used as the-end side. Are controlled to be selected respectively.
  • the signal level is repeatedly obtained at the same timing as in FIG.
  • the stylus 15 enters the continuous transmission period shown in FIG. 7
  • the signal level output from the AD conversion circuit 22 repeatedly becomes a predetermined value or more.
  • Ts see FIG.
  • the microprocessor 23 determines that the stylus 15 has entered the continuous transmission period, and shifts to the Y-axis full scan operation.
  • the predetermined time Ts is a time sufficiently longer than the period Td in which the stylus 15 transmits in the data transmission period.
  • the microprocessor 23 outputs a control signal g to the control circuit 18 in order to perform the Y-axis full scan operation, so that the switching circuit 16 selects the Y side and sets the Y electrode Y1 as the + end side of the Y selection circuit 14. , ⁇ Control is performed so that the Y electrode Y6 is selected as the end side. In this state, reception and AD conversion are performed at the same timing as shown in FIG.
  • the microprocessor 23 obtains the signal level while incrementing the number of the electrode selected by the Y selection circuit 14 one by one as in the case of the entire X-axis scan, and the selection at the + end side is the Y electrode Y25, the selection at the ⁇ end side The selection is performed until the Y electrode Y30 is reached. At this time as well, selection switching in the Y selection circuit 14 is performed in synchronization with the horizontal synchronization pulse h by the control signal f from the control circuit 18. At this time, as in the case of the entire X-axis scan, a signal distribution is obtained such that either the + end side or the ⁇ end side of the Y selection circuit 14 peaks when an electrode close to the stylus 15 is selected. In the present embodiment, the following description will be made assuming that the stylus 15 is placed near the Y electrode Y20.
  • the stylus 15 is placed near the intersection of the X electrode X11 and the Y electrode Y20. Subsequently, the microprocessor 23 sequentially selects the five X electrodes centered on the X electrode X11 and the five Y electrodes centered on the Y electrode Y20, and proceeds to a partial scan operation for obtaining a signal level.
  • FIG. 11 is a diagram showing a partial scan operation.
  • the signal level output from the AD conversion circuit 22 continues for a predetermined time Ts and exceeds a predetermined value. If it is, it is determined that the continuous transmission period from the stylus 15 has started, and the process proceeds to the coordinate detection operation (step 1 in FIG. 11).
  • This time Ts is the same as that described with reference to FIG. 10 and is sufficiently longer than the period Td of the digital signal transmitted by the stylus 15 during the data transmission period.
  • the microprocessor 23 has five X electrodes (X 9 to X 9) centered on the X electrode X 11 as the + end side of the X selection circuit 13 with the switching circuit 16 selecting the X side.
  • X13) is sequentially selected to read the signal level (step 1).
  • the-end side of the X selection circuit 13 selects the X electrodes X14 to X18 as X electrodes sufficiently separated from the X electrode selected on the + end side.
  • the signal reception and AD conversion are performed in synchronization with the horizontal synchronization pulse h.
  • the same electrode is detected four times and the average is obtained. Save the level as the received signal level.
  • the number of the X electrode selected as the + end side here, X11
  • the signal level VPX when the highest signal level is detected, the number of the X electrode selected as the + end side (here, X11), the signal level VPX, and the levels detected by the adjacent X electrodes are VAX, Save as VBX (step 1).
  • the microprocessor 23 selects the Y side so that the switching circuit 16 selects the Y side, and the five Y electrodes centered on the Y electrode Y 20 as the + end side of the Y selection circuit 14. (Y18 to Y22) are sequentially selected to read the signal level (step 1).
  • the negative end of the Y selection circuit 14 selects the Y electrodes Y23 to Y27 as Y electrodes sufficiently separated from the Y electrode selected on the positive end side.
  • signal reception and AD conversion are performed in synchronization with the horizontal synchronization pulse h, and detection is performed four times for the same electrode, and the average level is stored as the received signal level.
  • Step 1 when the highest signal level is detected, the number of the Y electrode selected as the + end side (here, Y20), the signal level VPY, and the levels detected by the adjacent electrodes are stored as VAY and VBY. (Step 1).
  • the signal levels VPX, VAX, VBX, VPY, VAY, VBY obtained here are used for calculation of coordinate values by a calculation formula described later.
  • the microprocessor 23 performs an operation for waiting for the end of the continuous transmission period from the stylus 15.
  • the microprocessor 23 controls the switching circuit 16 to select the X side, and uses the X electrode X11 from which the peak has been detected in the above-described coordinate detection operation as the + end side of the X selection circuit 13 as the ⁇ end side. Control is performed to select each of the electrodes X16.
  • the time when the signal level received in this state does not reach the predetermined value is the end time of the continuous transmission period from the stylus 15 (step 1).
  • the microprocessor 23 When the microprocessor 23 detects the end of the continuous transmission period from the stylus 15, the microprocessor 23 enters an operation of detecting the timing of the start signal (Start signal) transmitted prior to the pen pressure data (step 2).
  • the microprocessor 23 receives the signal in synchronization with the horizontal synchronization pulse h as shown in FIG. 4 in a state where the X selection circuit 13 selects the X electrode X11 as the + end side and the X electrode X16 as the ⁇ end side.
  • the AD conversion operation is repeated.
  • the time when the signal level is equal to or higher than the predetermined value is stored as t1.
  • the microprocessor 23 starts the data reception operation from the stylus 15 from the time waiting for a certain time Tw from the time t1 (step 2).
  • This time Tw is a time obtained after the transmission of the start signal from the stylus 15 is completed until almost no signal level is received.
  • the microprocessor 23 starts a timer (not shown) as soon as the above-described waiting time reaches the time Tw. This timer repeatedly counts from zero to a value that coincides with the above-described time Td (data transmission cycle from the stylus 15) (step 2). During the operation period of one cycle of the timer, the microprocessor 23 repeatedly performs signal reception and AD conversion to read the signal level. If the signal level during this period never reaches the above-mentioned predetermined value, it is determined that there was no transmission from the stylus 15 and the data at that time is stored as “0”, and the signal level equal to or higher than the predetermined value is stored during that time. If it is detected, it is determined that there is a transmission from the stylus 15, and the data at that time is stored as "1" (step 2).
  • the timer is counted 10 times and 10-bit data is saved.
  • the 10-bit data corresponds to the 10-bit writing pressure data shown in FIG. FIG. 11 shows the case where the writing pressure data is “01011010101”.
  • step 2 the X electrode X11 with the maximum level detected is selected from the X electrodes and data is received.
  • the Y electrode Y20 with the maximum level detected is selected from among the Y electrodes. You may go.
  • step 2 When the reception of 10-bit writing pressure data is completed in step 2, the operation proceeds to an operation (step 1) for detecting the start of the continuous transmission period from the stylus 15, and the microprocessor 23 repeats the operation of FIG.
  • the coordinate values (X, Y) of the stylus 15 are calculated from the reception levels VPX, VAX, VBX, VPY, VAY, VBY obtained in step 1 by the following equations.
  • X Px + (Dx / 2) ⁇ ((VBX ⁇ VAX) / (2 ⁇ VPX-VAX-VBX)) (Equation 1)
  • Px is the coordinate position of the X electrode (here, X11) where the maximum level is detected on the X axis
  • Dx is the arrangement pitch between the X electrodes.
  • Y Py + (Dy / 2) ⁇ ((VBY ⁇ VAY) / (2 ⁇ VPY ⁇ VAY ⁇ VBY)) (Equation 2)
  • Py is the coordinate position of the Y electrode (Y20 here) where the maximum level is detected on the Y axis
  • Dy is the arrangement pitch between the Y electrodes.
  • Equation 1 and (Equation 2) are merely examples, and are not necessarily optimal methods.
  • the optimum calculation method varies depending on the width and pitch of the X electrode and the Y electrode, and the stylus electrode shape.
  • the + end side is in the vicinity of the stylus as the electrode selected by the X selection circuit 13 and the Y selection circuit 14, but the ⁇ end side may be selected in the vicinity of the stylus.
  • the electrodes to be selected as the + end and the ⁇ end are selected with four electrodes interposed therebetween, other numbers may be separated.
  • the two electrodes selected as the + end and the ⁇ end of the X selection circuit 13 and the Y selection circuit 14 may be separated by a number that is slightly wider than the emission region of the electric field emitted from the electrode 31 of the stylus 15. preferable.
  • control circuit 18 is for avoiding the concentration of the processing of the microprocessor 23, and the control circuit 18 may be omitted.
  • coordinate detection on the X-axis side and coordinate detection on the Y-axis side at the position designated by the stylus 15 is switched by the switching circuit 16, but the differential between the X-axis side and the Y-axis side is performed.
  • An amplification circuit, an AD conversion circuit, and the like may be provided separately to perform reception processing at the same time.
  • the electrode of the transparent sensor 12 is constituted by an ITO pattern, but it may be formed as a substantially planar pattern by connecting very thin conductive materials having a width of 30 ⁇ m or less.
  • one electrode is selected for each of the + end side and the ⁇ end side of the X selection circuit 13 and the Y selection circuit 14, but the same number of plural electrodes may be selected simultaneously.
  • the signal level in the partial scan for obtaining the X coordinate and the Y coordinate of the position designated by the stylus 15, the signal level is obtained four times for the same electrode.
  • the signal level may be once for the same electrode or other times. It is also good.
  • the first electrode is an X electrode
  • the second electrode is a Y electrode
  • the first direction (X direction) and the second direction (Y direction) are arranged directions.
  • the directions are orthogonal to each other, but the first direction and the second direction do not have to be orthogonal, and the present invention can be applied as long as the directions intersect each other.
  • the differential amplifier circuit 17 is used to detect a difference between signals induced to these electrodes, and the same as the horizontal synchronizing pulse h of the display device. Since the detection is performed at a period, the noise of the display device is not mixed at the timing of detecting the signal and AD conversion, and the coordinate position of the stylus 15 is accurately detected without being affected by the noise generated by the display device. can do.
  • the coordinate position of the stylus 15 can be accurately detected without being affected by noise.
  • the writing pressure information of the stylus 15 is transmitted by ASK modulation, it becomes possible to use the band-pass filter circuit 19 having a narrow bandwidth on the position detection device side, and from the display device.
  • the coordinate position can be detected stably without being affected by noise.
  • the noise superimposed on the two receiving electrodes is canceled by using the differential amplifier circuit 17.
  • the switch 20 is turned off during the period in which the display device generates noise. Therefore, the amplifier circuit 27 may be used instead of the differential amplifier circuit 17 as shown in FIG.
  • the X selection circuit 13 'and the Y selection circuit 14' are each configured to select one X electrode and one Y electrode, and the switching circuit 16 ' , One X electrode selected by the X selection circuit 13 ′ and one Y electrode selected by the Y selection circuit 14 ′ are selected.
  • the X selection circuit 13 'and the Y selection circuit 14' may be configured to select a plurality of X electrodes and Y electrodes, as in the above-described embodiment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Position Input By Displaying (AREA)

Abstract

La présente invention concerne un appareil de détection de position qui peut détecter avec précision et entrer une position de coordonnées d'un stylet sans être affecté par le bruit émis par un appareil d'affichage. L'appareil de détection de position détecte, sur un appareil d'affichage pouvant rafraîchir un écran à intervalle régulier, la position de pointage d'un stylet qui émet une champ électrique à courant alternatif à partir d'une électrode placée sur son extrémité côté pointe. L'appareil de détection de position comprend un capteur sensiblement transparent monté sur l'appareil d'affichage. Le capteur comprend : des premières électrodes et des secondes électrodes ; un premier circuit de sélection pour sélectionner deux ensembles d'électrodes des premières électrodes en tant que bornes positives et bornes négatives ; un second circuit de sélection pour sélectionner deux ensembles d'électrodes des secondes électrodes en tant que bornes positives et bornes négatives ; un amplificateur différentiel pour amplifier la différence entre des signaux apparaissant à la borne positive et la borne négative sélectionnées par le premier circuit de sélection et/ou le second circuit de sélection ; et un convertisseur analogique-numérique (CAN) qui détecte le niveau d'un signal émis par l'amplificateur différentiel au même moment qu'une impulsion de synchronisation horizontale pour l'appareil d'affichage et convertit le signal en un signal numérique.
PCT/JP2015/054208 2014-03-10 2015-02-17 Appareil de détection de position WO2015137053A1 (fr)

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WO2018020598A1 (fr) * 2016-07-27 2018-02-01 株式会社ワコム Stylet et contrôleur de capteur
WO2019087332A1 (fr) * 2017-11-01 2019-05-09 株式会社ワコム Système de détection de position et capteur tactile
CN109791445A (zh) * 2016-10-06 2019-05-21 株式会社和冠 触控笔及控制器
CN110770684A (zh) * 2019-08-27 2020-02-07 深圳市汇顶科技股份有限公司 一种主动笔驱动电路、驱动方法、驱动芯片及主动笔
CN110892368A (zh) * 2017-11-14 2020-03-17 株式会社和冠 传感器控制器
CN111316212A (zh) * 2018-02-13 2020-06-19 株式会社和冠 位置检测装置以及基于电磁感应耦合及静电耦合的位置检测方法
JP2020181614A (ja) * 2016-07-27 2020-11-05 株式会社ワコム センサコントローラ
CN115553865A (zh) * 2022-11-17 2023-01-03 杭州欣润医疗科技有限公司 一种探针的检测装置

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JP2014035631A (ja) * 2012-08-08 2014-02-24 Wacom Co Ltd 位置検出装置およびその位置指示器

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JP2005537570A (ja) * 2002-08-29 2005-12-08 エヌ−トリグ リミテッド 透明デジタイザ
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Cited By (22)

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US10198093B2 (en) 2016-07-27 2019-02-05 Wacom Co., Ltd. Stylus and sensor controller
US11442560B2 (en) 2016-07-27 2022-09-13 Wacom Co., Ltd. Stylus and sensor controller
JPWO2018020598A1 (ja) * 2016-07-27 2019-05-16 株式会社ワコム スタイラス及びセンサコントローラ
WO2018020598A1 (fr) * 2016-07-27 2018-02-01 株式会社ワコム Stylet et contrôleur de capteur
US10976839B2 (en) 2016-07-27 2021-04-13 Wacom Co., Ltd. Stylus and sensor controller
JP2020181614A (ja) * 2016-07-27 2020-11-05 株式会社ワコム センサコントローラ
CN109791445B (zh) * 2016-10-06 2023-06-30 株式会社和冠 触控笔及控制器
CN109791445A (zh) * 2016-10-06 2019-05-21 株式会社和冠 触控笔及控制器
CN111356974A (zh) * 2017-11-01 2020-06-30 株式会社和冠 位置检测系统及触摸传感器
JPWO2019087332A1 (ja) * 2017-11-01 2020-11-19 株式会社ワコム 位置検出システム及びタッチセンサ
CN111356974B (zh) * 2017-11-01 2024-04-16 株式会社和冠 位置检测系统及触摸传感器
US11294506B2 (en) 2017-11-01 2022-04-05 Wacom Co., Ltd. Position detection system and touch sensor
WO2019087332A1 (fr) * 2017-11-01 2019-05-09 株式会社ワコム Système de détection de position et capteur tactile
US11914817B2 (en) 2017-11-01 2024-02-27 Wacom Co., Ltd. Position detection system and touch sensor
CN110892368A (zh) * 2017-11-14 2020-03-17 株式会社和冠 传感器控制器
CN111316212A (zh) * 2018-02-13 2020-06-19 株式会社和冠 位置检测装置以及基于电磁感应耦合及静电耦合的位置检测方法
CN110770684A (zh) * 2019-08-27 2020-02-07 深圳市汇顶科技股份有限公司 一种主动笔驱动电路、驱动方法、驱动芯片及主动笔
CN110770684B (zh) * 2019-08-27 2024-02-13 深圳市汇顶科技股份有限公司 一种主动笔驱动电路、驱动方法、驱动芯片及主动笔
JP7159411B2 (ja) 2020-08-11 2022-10-24 株式会社ワコム センサコントローラ、コンピュータによって実行される方法、及び電子機器
JP2021168217A (ja) * 2020-08-11 2021-10-21 株式会社ワコム センサコントローラ、コンピュータによって実行される方法、及び電子機器
CN115553865A (zh) * 2022-11-17 2023-01-03 杭州欣润医疗科技有限公司 一种探针的检测装置
CN115553865B (zh) * 2022-11-17 2023-09-08 杭州欣润医疗科技有限公司 一种探针的检测装置

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