WO2017010453A1 - Contrôleur de panneau tactile, système de panneau tactile, et appareil électronique - Google Patents

Contrôleur de panneau tactile, système de panneau tactile, et appareil électronique Download PDF

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Publication number
WO2017010453A1
WO2017010453A1 PCT/JP2016/070408 JP2016070408W WO2017010453A1 WO 2017010453 A1 WO2017010453 A1 WO 2017010453A1 JP 2016070408 W JP2016070408 W JP 2016070408W WO 2017010453 A1 WO2017010453 A1 WO 2017010453A1
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Prior art keywords
drive
touch panel
noise
circuit
driving
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PCT/JP2016/070408
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English (en)
Japanese (ja)
Inventor
齋藤　崇志
中林　太美世
秀秋 新屋
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シャープ株式会社
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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
    • 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
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Definitions

  • the present invention relates to a touch panel controller, a touch panel system, and an electronic device.
  • a touch panel system in which a touch panel is pasted on a display panel is provided with a touch panel and a touch panel controller.
  • the touch panel controller detects a touch input to the touch panel, thereby enabling an intuitive operation by a user.
  • the touch panel system can be classified into several types according to the touch detection method.
  • the capacitive touch panel system includes a mutual capacitance type and a self-capacitance type.
  • the touch panel includes an electrode line, and the touch panel controller touches based on a change in the capacitance value formed between the electrode line and GND when a detection target approaches. Detect input.
  • the touch panel is a capacitor formed at the intersection of the first electrode line (drive line) and the second electrode line (sense line) that intersect each other in plan view, and the drive line and the sense line.
  • the touch panel controller detects a touch input based on a change in the capacitance value of the capacitor when the detection object approaches.
  • the touch panel controller drives the electrode line at a predetermined timing and detects a touch input based on a change in the value of the capacitance formed by the electrode line.
  • noise that can be mixed into the data there are noise that uses a display panel as a noise source and external noise that enters from the outside.
  • the noise from the display panel is a noise having a predetermined frequency component based on the driving method of the display panel, but the external noise is an unknown frequency and includes various frequency components.
  • Patent Document 1 describes that, as a countermeasure against external noise, the external noise removal drive frequency is determined while shifting the drive frequency of the touch panel.
  • Patent Document 2 as a countermeasure against noise from the display panel, the touch panel is driven while avoiding a period in which the level of noise generated by the display panel is relatively high in accordance with the rising cycle of the horizontal synchronization signal of the display panel. It is described.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 2015-56151 (published on March 23, 2015)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2013-206206 (published on October 7, 2013)”
  • the touch panel system has been made thinner, including a structure called a touch panel in which a touch panel sensor is formed in the display panel.
  • a touch panel in which a touch panel sensor is formed in the display panel.
  • the distance between the touch panel and the display panel is short, and the display The effect of noise from the panel is too large to ignore.
  • the present invention has been made in view of the above problems, and its purpose is to improve touch detection accuracy by taking noise countermeasures for both noise of a predetermined frequency and noise of other frequencies. It is to provide a touch panel controller.
  • a touch panel controller that controls a touch panel including one or more electrode lines, and a driving circuit that drives the electrode lines;
  • a detection circuit that detects a change in capacitance value of a capacitance formed by the electrode line in accordance with the driving of the electrode line, a plurality of drive defining units that each define a drive pattern of the drive circuit, and the plurality of drives
  • a switching circuit that switches between the drive patterns by selecting one of the defining units so as to reduce noise mixed in the detection result of the detection circuit, and each of the plurality of drive patterns has a predetermined frequency. It is set to reduce the noise and the noise having a frequency different from the predetermined frequency.
  • a touch panel controller with improved touch detection accuracy by taking noise countermeasures against both noise generated by the display panel and external noise.
  • FIG. 1 is a block diagram illustrating a configuration of an electronic device according to a first embodiment.
  • 1 is a circuit diagram showing a configuration of a touch panel system according to Embodiment 1.
  • FIG. 5 is a circuit diagram for explaining a driving method of the touch panel system according to Embodiment 1.
  • FIG. It is a figure for demonstrating the numerical formula which shows the drive method of the touchscreen system which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating the numerical formula which shows the method of driving a touch panel system in parallel by M series code
  • It is a circuit diagram which shows the condition where noise is applied to a touch panel system. It is a timing chart which shows an example of the drive pattern of a drive circuit.
  • 6 is a graph showing a relationship between a noise frequency and a noise attenuation rate when driven by each drive pattern determined by another subsystem of the first embodiment.
  • 6 is a graph showing a relationship between a noise frequency and a noise attenuation rate when driven by each drive pattern defined by still another subsystem of the first embodiment.
  • 6 is a graph showing a relationship between a noise frequency and a noise attenuation rate when driven by each drive pattern defined by still another subsystem of the first embodiment.
  • FIG. 10 is a circuit diagram for explaining a driving method of the touch panel system according to Embodiment 2.
  • FIG. 10 is a timing chart for explaining another drive pattern of the touch panel system of Embodiment 2, wherein (a) shows a change in potential applied to the drive line when the drive line is driven by PM2 addition, and (b). Indicates a change in potential applied to the drive line when the drive period of V (n, k) and the drive period of V (n, k + 1) are overlapped by adding P0M02 times. It is a circuit diagram which shows the structure of the touchscreen system which concerns on Embodiment 3.
  • FIG. 10 is a timing chart for explaining another drive pattern of the touch panel system of Embodiment 2, wherein (a) shows a change in potential applied to the drive line when the drive line is driven by PM2 addition, and (b). Indicates a change in potential applied to the drive line when the drive period of V (n, k) and the drive period of V (n, k + 1) are overlapped by adding P0M02 times.
  • Embodiment 1 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
  • FIG. 1 is a block diagram illustrating a configuration of an electronic apparatus according to the first embodiment.
  • the electronic device 100 includes a touch panel system 1, a display module 92, a CPU 96, a RAM 97, and a ROM 98. Although illustration is omitted, the electronic device 100 may include a configuration of a camera, a microphone, a speaker, an operation key, and the like.
  • the electronic device 100 receives a touch input from the user on the touch input surface and performs a process according to the touch input.
  • the display module 92 includes a display panel 92b that displays an image and a display control circuit 92a that controls the display image by driving the display panel 92b. More specifically, the display panel 92b includes a plurality of pixels arranged in a matrix, and the display control circuit 92a updates the display image by scanning the pixels for each row at a predetermined cycle.
  • the touch panel system 1 is provided on the display surface of the display panel 92b, and the touch panel 2 outputs signal data corresponding to the presence / absence of the detection target and the position of the detection target in contact with or close to the touch input surface, and the touch panel. 2 is provided with a touch panel controller 3 that is driven by giving a drive signal to 2 and acquires signal data output from the touch panel 2 to detect a contact position or a proximity position of a detection target. Detailed configurations of the touch panel 2 and the touch panel controller 3 will be described later.
  • the CPU 96 controls the operation of the touch panel controller 3 and the display control circuit 92a, and also controls the operation of other circuits (not shown) of the electronic device 100.
  • the CPU 96 executes a program stored in the ROM 98, for example.
  • the RAM 97 stores data generated by executing the program by the CPU 96 in a volatile manner.
  • the ROM 98 stores data in a nonvolatile manner.
  • the ROM 98 is a ROM capable of writing and erasing, such as an EPROM (Erasable Programmable Read-Only Memory) and a flash memory.
  • the touch panel 2 may be built in the display panel 92b. That is, the touch panel system 1 may be a so-called in-cell type touch panel system. Since the touch panel 2 is built in the display panel 92b, the electronic device 100 can be thinned. In addition, in the electronic device 100 of this embodiment, it is not essential that the touch panel 2 is built in the display panel 92b, and the touch panel 2 may be provided so as to overlap the surface of the display panel 92b. .
  • FIG. 2 is a circuit diagram showing a configuration of the touch panel system 1 according to the present embodiment.
  • the touch panel 2 includes M drive lines and N sense lines that intersect with each other in plan view, and a capacitor formed at each intersection of the drive lines and the sense lines.
  • the drive line and the sense line may be formed in different layers.
  • a sense line is formed on the side closer to the touch input surface (front side) of the touch panel 2 and a drive line is formed on the side farther from the touch input surface (back side).
  • the touch panel controller 3 includes a drive circuit 4, a detection circuit 10, a control circuit 14 that controls the drive circuit 4 and the detection circuit 10, and a noise amount estimation circuit 9 that estimates a noise amount mixed in a detection result by the detection circuit 10. It is equipped with.
  • the drive circuit 4 drives the drive lines DL1 to DL4 with a drive signal based on the code series, and outputs signal data based on the capacitance values of the capacitors C11 to C44 along the sense lines SL1 to SL4.
  • the detection circuit 10 detects the capacitance distribution of the capacitors C11 to C44 based on the inner product calculation of the signal data (linear sum signal) and the code sequence.
  • the detection circuit 10 includes an amplification circuit 7, an AD conversion circuit 13, and a decoding operation circuit 8 connected to the sense lines SL 1 to SL 4, respectively.
  • Each amplifier circuit 7 has an amplifier 18, an integration capacitor Cint and a reset switch connected in parallel to the amplifier 18.
  • Each amplifier circuit 7 reads and amplifies signal data based on the capacitance values of the capacitors C11 to C44 corresponding to the drive lines DL1 to DL4 driven by the drive circuit 4 along the sense lines SL1 to SL4.
  • the AD converter circuit 13 converts the output of the amplifier circuit 7 from analog to digital.
  • the decoding operation circuit 8 estimates the capacitance values of the capacitors C11 to C44 (capacitance) based on the output of the amplification circuit 7 that has been analog-digital converted by the AD conversion circuit 13.
  • the control circuit 14 includes a plurality of subsystems 5a and 5b (drive defining units) having different input / output transmission characteristics, and a switching circuit 6 that connects any one of the subsystems 5a and 5b to the drive circuit 4. ing.
  • the control circuit 14 includes two subsystems 5a and 5b.
  • the number of subsystems included in the control circuit 14 is not limited, and the control circuit 14 includes three or more subsystems. You may do it.
  • the subsystems 5a and 5b define the drive pattern of the drive circuit 4.
  • the subsystems 5a and 5b define, for example, the drive timing of the drive circuit 4 as a drive pattern.
  • the switching circuit 6 selects one of the subsystems 5a and 5b based on the estimation result of the noise amount estimation circuit 9 and connects it to the drive circuit 4. More specifically, the switching circuit 6 is configured so that the detection circuit 10 drives the capacitance values of the capacitors C11 to C44 as the drive circuit 4 drives the drive lines DL1 to DL4 based on the drive pattern determined by the subsystem. A subsystem is selected and connected to the drive circuit 4 so as to reduce noise mixed in the detection result of the detection circuit 10 when a change in the signal is detected.
  • the drive circuit 4 drives the drive lines DL1 to DL4 based on the drive pattern of the subsystem selected by the switching circuit 6.
  • the control circuit 14 controls the drive pattern of the drive circuit 4.
  • the control circuit 14 controls the sampling timing of the signal data by the AD conversion circuit 13, the number of times of sampling, and the operation of the decoding arithmetic circuit 8 according to the subsystem selected by the switching circuit 6.
  • FIG. 3 is a circuit diagram for explaining a driving method of the touch panel system according to the present embodiment.
  • the drive circuit 4 drives the drive line based on the code sequence V (n) of K rows and P columns (M ⁇ K, M ⁇ P).
  • the drive period of each drive line is a period for initializing the potential of the drive line. And an initialization period and a measurement period in which the detection circuit 10 detects signal data based on the capacitance value.
  • V (n) is “1” as an element for instructing the first drive in which the potential of the initialization period is L level and the potential of the measurement period is H level (a potential of the first polarity), and the potential of the initialization period is The element to hold is “0”, the element instructing the second drive to set the potential in the initialization period to H level and the potential in the measurement period to L level (second polarity potential) is “ ⁇ 1”.
  • V (n, k) the element in the kth row of the code V (n) be V (n, k).
  • the drive lines are driven sequentially based on each element in the order of V (n, 1), V (n, 2),... V (n, k-1), V (n, k),. Is done. That is, in the basic driving pattern in which the capacitance value is measured once corresponding to each element, in the first measurement by V (n, 1) which is the first element of the code V (n), The first drive line Tx (1) is driven by V (1,1), and the nth drive line Tx (n) is driven by V (n, 1).
  • the drive circuit 4 of the touch panel system 1 of the present embodiment drives the drive lines DL1 to DL4 in parallel.
  • the drive circuit 4 uses the N codes V (n) having a high orthogonality rate so that each element of V (n, k) is “1” or “ ⁇ 1”. Drive in parallel.
  • FIG. 4 is a view for explaining mathematical formulas showing a driving method of the touch panel system according to the present embodiment.
  • the driving circuit 4 drives the driving lines DL1 to DL4 based on the orthogonal code sequence of 4 rows and 4 columns shown in Equation 1 of FIG.
  • the orthogonal code sequence is composed of elements “1” and “ ⁇ 1”.
  • the drive circuit 4 applies the voltage Vdrive, and when the element is “ ⁇ 1”, ⁇ Vdrive is applied.
  • the voltage Vdrive may be a power supply voltage, but may be a voltage other than the power supply voltage.
  • the code sequence may include an element “0” that stops driving.
  • Equation 2 by taking the inner product of the signal data Y1, Y2, Y3, Y4 and the orthogonal code sequence, the capacitances C1 to C4 are estimated as shown in Equation 3. Can do.
  • the above operation is performed a plurality of times, and the touch input is detected by calculating the signal data obtained by the plurality of operations.
  • the timing of the operation performed a plurality of times subsystems 5a and 5b having different input / output transfer characteristics can be realized.
  • FIG. 5 is a diagram for explaining mathematical formulas showing a method of driving the touch panel system 1 in parallel using M-sequence codes.
  • the capacitance can also be estimated by driving the capacitance in parallel with the M-sequence code.
  • the capacitances C1 to C7 can be estimated by taking the inner product of the linear sum signal data Y1 to Y7.
  • the “M sequence” is a kind of binary pseudorandom number sequence, and is composed of only binary values of 1 and ⁇ 1 (or 1 and 0).
  • the noise amount estimation circuit 9 makes a determination using a plurality of outputs from the decoding operation circuit 8.
  • the switching circuit 6 switches the subsystems 5a and 5b based on the estimation result of the noise amount estimation circuit 9.
  • a plurality of estimation results of the capacitance values obtained by switching and measuring the subsystems 5a and 5b should be the same value, and when they do not become the same value, the noise amount estimation is performed.
  • the circuit 9 estimates that the influence of the noise amount mixed in the estimation result has increased.
  • the method by which the noise amount estimation circuit 9 estimates the noise amount is not limited to this.
  • signal data may be read a plurality of times along each sense line with the same drive pattern, and the amount of noise may be estimated based on the variation of the obtained capacitance value (or signal data). Further, the amount of noise may be estimated based on whether or not the waveform pattern of the signal data when noise exists is extracted from the waveform of the read signal data.
  • FIG. 6 is a circuit diagram illustrating a situation where noise is applied to the touch panel system.
  • the sense line SL3 will be described as an example.
  • the noise voltage Vn is applied, the sense line SL3 is passed through the parasitic capacitance Cp formed between the noise source and the sense line SL3.
  • Noise is mixed in the signal data read along SL3, and the signal data is as follows.
  • Examples of noise that can be mixed in the detection result of the detection circuit 10 include display noise generated by the display module 92 and external noise entering from the outside of the electronic device 100.
  • Display noise is generated in synchronization with a predetermined cycle based on the timing at which the display control circuit 92a sequentially updates the pixels of the display panel 92b for each row based on the horizontal synchronization signal HSYNC. Therefore, the display noise has a predetermined frequency based on the frequency of the horizontal synchronization signal HSYNC, and is, for example, 150 Hz.
  • the display module 92 is a liquid crystal display device
  • the liquid crystal display panel is driven with a voltage of, for example, 10 V or more, and the influence on the touch panel system 1 is large.
  • the touch panel system is an in-cell type
  • the sense line is formed on the side closer to the touch input surface of the touch panel 2 and the drive line is formed on the side far from the touch input surface
  • the drive line and the liquid crystal display Since the distance to the device is not sufficiently large, the influence of the liquid crystal display device on the touch panel system 1 cannot be ignored.
  • External noise is generally an unknown frequency that cannot be predicted in advance for the touch panel system 1, and various cases of noise intrusion paths are assumed.
  • a detection target for example, a human finger
  • the measurement system of the touch panel system 1 has an external signal having some frequency component in the measurement signal. A signal with noise added is observed.
  • the display noise frequency is a known frequency. That is, the frequency of display noise can be estimated by prior measurement or theory, and is not an unknown frequency. Therefore, the display noise mixed in the detection result of the detection circuit 10 can be reduced by setting the drive pattern of the drive circuit 4 and the target frequency of the noise filter so that the influence of the display noise is reduced.
  • the frequency of external noise is an unknown frequency
  • external noise of various frequencies can intrude depending on the usage status of the electronic device 100, including frequencies different from the frequency of display noise. Therefore, it is difficult to predict a setting that can reliably increase the resistance to external noise in the design stage and the manufacturing stage of the electronic device 100.
  • the control circuit 14 of the touch panel controller 3 appropriately switches the drive pattern of the drive circuit based on the subsystems 5a and 5b, thereby taking measures against noise against both display noise and external noise.
  • the noise mixed in the detection result of the detection circuit 10 can be reduced.
  • the subsystems 5a and 5b determine the drive pattern of the drive circuit 4, such as the drive timing of the drive circuit 4, the number of drive lines driven according to the number of samplings of the detection circuit 10, and the potential applied to the drive line during the measurement period. Yes.
  • a method of operating the drive circuit 4 of the touch panel controller 3 in synchronization with the horizontal synchronization signal HSYNC of the display module 92 is a general method. Specifically, using the horizontal synchronization signal HSYNC as a trigger, the drive line is driven at least once at a timing at which the S / N of the capacitance value detected by the detection circuit 10 is improved. In this case, if the frequency of the horizontal synchronization signal HSYNC is Fs, the drive frequency of the drive circuit 4 is Fs / k (k is an integer of 1 or more).
  • the driving frequency of the driving circuit 4 when the touch panel system 1 operates is determined by each of the subsystems 5a and 5b.
  • the number of drive lines driven by the drive circuit 4 corresponds to the number of samplings by the detection circuit 10.
  • the detection circuit 4 drives the drive line N times to generate N signal data, and the detection circuit 10 A change in the capacitance value of the capacitor formed by the drive line is detected by calculating N signal data obtained as the line is driven N times.
  • the number of samplings when the touch panel system 1 operates and the number of times the drive line is driven according to the number of samplings are determined by the subsystems 5a and 5b.
  • the drive period by V (n, k) is divided into a plurality of drive periods, and the plurality of drive periods are assigned to a non-inversion measurement period and an inversion measurement period. Specifically, if the element of V (n, k) is “1”, measurement is performed with element “1” in non-inversion measurement and measurement with element “ ⁇ 1” in inversion measurement, and V (n , K) is “ ⁇ 1”, non-inversion measurement is performed with element “ ⁇ 1”, and inversion measurement is performed with element “1”.
  • FIG. 7 is a timing chart showing an example of a drive pattern of the drive circuit.
  • FIG. 7 shows an example of a drive pattern with two samplings.
  • non-inversion measurement is performed in which the driving line is driven according to V (n, k + 1), the potential of the drive line is set to L level at initialization, and set to H level during measurement.
  • non-inversion measurement is performed in which the potential of the drive line is set to L level at the time of initialization and set to H level during measurement.
  • the signal data detected by the detection circuit 10 in the two measurements is calculated.
  • the non-inversion measurement is expressed as “P”
  • the inversion measurement is expressed as “M”
  • the sampling number and the inversion / non-inversion driving pattern are “P” and “M”.
  • a drive pattern that performs measurement twice in non-inversion measurement is expressed as “PP”
  • a drive pattern that performs measurement twice in which non-inversion measurement is performed for the first time and inversion measurement for the second time is expressed as “PM”.
  • PPPP a driving pattern in which measurement is repeated four times by inversion measurement
  • PPPP4 addition a driving pattern in which measurement is repeated four times by inversion measurement
  • PM is for VectorN measurement
  • PP is for VectorN + 1 measurement.
  • non-inverted measurement is performed in the first measurement period, and inversion measurement is performed in which the measurement result is multiplied by ⁇ 1 in the second measurement period. (PM). Therefore, when in-phase noise is mixed in both of the two measurement periods, the influence of the noise cancels out by calculating the signal data detected by the detection circuit 10 in the two measurements. Can be reduced. However, when anti-phase noise is mixed in two measurement periods, the effects of noise cancel each other in PP, and the effects of noise do not cancel each other in PM.
  • Whether the drive circuit 4 drives the drive line by inversion measurement or non-inversion measurement when the touch panel system 1 operates is determined by each of the subsystems 5a and 5b.
  • FIG. 8 is a graph showing the relationship between the noise frequency and the noise attenuation rate when driven by each drive pattern defined by the subsystem of the present embodiment.
  • the horizontal axis represents the frequency of noise entering the touch panel system 1
  • the vertical axis represents the attenuation rate of entering noise.
  • the subsystem 5a defines a driving pattern for PP four times addition
  • the subsystem 5b defines a driving pattern for PP six times addition.
  • the curve in the graph of FIG. 8 shows the external noise of the sine wave that enters the drive line and the sense line when the drive line is driven by adding PP 4 times and PP 6 times, and the noise mixed in the detection result of the detection circuit 10.
  • the input / output transfer characteristics indicating the relationship with Even if the waveform of the invading external noise is other than a sine wave, it can be considered in substantially the same manner.
  • the output transfer characteristics are different from each other. For example, with respect to noise of about 100 kHz, noise is attenuated when driving with a driving pattern of PP6 addition rather than driving with a driving pattern of PP4 addition.
  • a subsystem that defines a drive pattern with a higher noise attenuation rate is selected and driven out of a drive pattern of PP 4 times addition or a drive pattern of PP 6 times addition.
  • the influence of noise can be reduced.
  • FIG. 9 is a graph showing the relationship between the noise frequency and the noise attenuation rate when driven by each drive pattern defined by another subsystem of this embodiment.
  • the curve in the graph of FIG. 9 shows the relationship between the incoming sine wave external noise and the noise mixed in the detection result of the detection circuit 10 when the drive line is driven by PP 8 times addition and PP 32 times addition.
  • the output transfer characteristic is obtained by calculation.
  • the input / output transfer characteristics when driven by the drive pattern of PP 8 times addition and the input / output transfer characteristics when driven by the drive pattern of PP 32 times addition are different from each other.
  • the input / output transmission characteristics of the drive pattern of PP32 addition have more frequency points at which noise is attenuated than the input / output transmission characteristics of the drive pattern of PP8 addition.
  • the frequency point at which noise is attenuated increases in proportion to the number of samplings.
  • the overall noise attenuation rate is larger in the input / output transfer characteristic of the drive pattern of PP32 addition than the input / output transfer characteristic of the drive pattern of PP8 addition (the attenuation width is large).
  • the envelope of the curve of the input / output transfer characteristics is reduced in proportion to the number of samplings, and the noise attenuation rate is increased.
  • FIG. 10 is a graph showing the relationship between the noise frequency and the noise attenuation rate when driven by each drive pattern defined by another subsystem of this embodiment.
  • the curve in the graph of FIG. 10 shows the relationship between the external noise of the intruding sine wave and the noise mixed in the detection result of the detection circuit 10 when the drive line is driven by PP 4 times addition and PM 4 times addition.
  • the output transfer characteristic is obtained by calculation.
  • the input / output transfer characteristics when driven with the PP 4-addition drive pattern and the input-output transfer characteristics when driven with the PM4-addition drive pattern are different from each other.
  • the noise of the frequency of Fs 150 Hz
  • the noise is attenuated when driven by the drive pattern of 4 additions of PP than when driven by the drive pattern of 4 additions of PP.
  • noise having a frequency of Fs / 2 noise is attenuated when driven with a drive pattern of PP 4 times addition than when driven with a drive pattern of PM 4 times addition.
  • the drive pattern having a higher noise attenuation rate is selected and driven from the drive pattern of PP 4 times addition or the drive pattern of PM 4 times addition, thereby affecting the influence of noise. Can be reduced.
  • FIG. 11 is a graph showing the relationship between the noise frequency and the noise attenuation rate when driven by each drive pattern defined by another subsystem of the present embodiment.
  • the curve in the graph of FIG. 11 shows the relationship between the incoming sine wave external noise and the noise mixed into the detection result of the detection circuit 10 when the drive line is driven by PP 32 times addition and PM 32 times addition.
  • the output transfer characteristic is obtained by calculation.
  • the input / output transfer characteristics when driven by the drive pattern of PP 32 times addition and the input / output transfer characteristics when driven by the drive pattern of PM 32 times addition are different from each other.
  • the specific difference between the input / output transfer characteristic of the drive pattern of PP 32 times addition and the input / output transfer characteristic of the drive pattern of PM 32 times addition is as described with reference to FIGS.
  • the input / output transmission when the PM 32 times addition driving pattern is used.
  • the input / output transfer characteristic when driven with a drive pattern of 32 additions of PM For characteristics with a large noise attenuation rate and a low noise attenuation rate in the input / output transfer characteristic when driven with a drive pattern of 32 additions of PM, the input / output transfer characteristic when driven with a drive pattern of 32 additions of PP The noise attenuation rate is large.
  • the input / output transmission characteristic when driven with the driving pattern of PP 32 times addition and the input / output transmission characteristic when driven with the driving pattern of PM 32 times addition are complementary to each other.
  • the influence of noise can be effectively reduced by switching and driving the drive patterns of the input / output transfer characteristics that are complementary to each other.
  • display noise can be greatly attenuated by driving the drive line so as to be completely synchronized with the horizontal synchronization signal HSYNC using the horizontal synchronization signal HSYNC as a trigger.
  • the frequency of display noise (the frequency of noise derived from the horizontal synchronization signal HSYNC) is 150 kz, and any combination of drive patterns described with reference to FIGS.
  • at least any one of the input / output transfer characteristics has a small attenuation rate of 150 kHz noise (attenuation width is small).
  • FIG. 12 is a graph showing the relationship between the noise frequency and the noise attenuation rate when driven by each drive pattern defined by another subsystem of this embodiment.
  • the curve in the graph of FIG. 12 indicates the relationship between the external noise of the intruding sine wave and the noise mixed in the detection result of the detection circuit 10 when the drive line is driven by PM 8 times addition and P0M08 time addition.
  • the output transfer characteristic is obtained by calculation.
  • P0M08 times addition means that after a non-inversion measurement is performed for the first time, a rest period having the same length as the measurement period is provided, and then after the inversion measurement is performed for the second time, the same length as the measurement period. This means a driving pattern that repeats the measurement for providing a pause period.
  • the interval between the first non-inversion measurement timing and the second inversion measurement timing is 1/75 Hz, which is twice the interval of the continuous horizontal synchronization signal HSYNC. ing.
  • the drive frequency in this measurement period is half the frequency of the horizontal synchronization signal HSYNC (75 kHz).
  • the interval between the timing of the first non-inversion measurement and the timing of the second inversion measurement is not limited to 1/75 Hz. If the frequency of the horizontal synchronization signal HSYNC is Fs, k / Fs (k is 2 or more). Integer). Similarly, the drive frequency may be Fs / k.
  • the input / output transfer characteristic when driven with the drive pattern of PM 8 times addition and the input / output transfer characteristic when driven with the drive pattern of P0M08 add are different from each other.
  • the input / output transmission characteristics when driving with the driving pattern of P0M08 addition are set to a low driving frequency of 75 kHz, so that noise having a frequency equal to or higher than the Nyquist frequency is input, and noise wrapping occurs. As a result, the frequency point at which the noise is attenuated moves to Fs / 4.
  • the input / output transfer characteristic when driven with the drive pattern of PM8 addition and the input / output transfer characteristic when driven with the drive pattern of P0M08 addition are complementary to each other.
  • FIG. 13 is a graph connecting the input / output transfer characteristics having the larger attenuation rate at each frequency among the input / output transfer characteristics of each drive pattern defined by the two subsystems of the present embodiment.
  • both of the input / output transfer characteristics when driven with the drive pattern of PM 8 times addition and the input / output transfer characteristics when driven with the drive pattern of P0M08 times add have a large 150 kHz noise attenuation rate (attenuation width). Display noise) and display noise can be reduced.
  • noise countermeasures can be taken against both external noise and display noise, and touch detection accuracy can be improved.
  • FIG. 14 is a graph connecting the input / output transfer characteristics having the larger attenuation rate at each frequency among the input / output transfer characteristics of each drive pattern determined by the two subsystems with further increased sampling numbers.
  • FIG. 14 shows an input / output transfer characteristic when driven with a drive pattern of 32 additions of PM and an input / output transfer characteristic when driven with a drive pattern of addition of P0M032 times. It is a graph connecting the larger input / output transfer characteristics.
  • FIG. 15 is a flowchart showing a process for changing the drive pattern of the touch panel system of the present embodiment.
  • a method of changing the drive pattern so as to reduce the influence of noise according to the noise attenuation rate will be described.
  • the drive circuit 4 drives the drive line with the drive pattern determined by the subsystem connected in the initial setting, and the detection circuit 10 follows the sense line.
  • the signal data is taken in and the capacitance value of the capacitor is detected (S1).
  • the noise amount estimation circuit 9 estimates the amount of external noise mixed in the detected capacitance value (S2).
  • the switching circuit 6 switches the subsystem connected to the drive circuit 4 to another subsystem (S4).
  • the drive circuit 4 drives the drive line with a drive pattern determined by the newly connected subsystem, and the detection circuit 10 captures signal data along the sense line and detects the capacitance value of the capacitor. (S5).
  • the noise amount estimation circuit 9 estimates the amount of external noise mixed in the detected capacitance value (S6).
  • S7 it is determined whether or not the amount of external noise mixed is below a certain level.
  • This process may be performed by the switching circuit 6 or the CPU 96.
  • the constant level of the noise amount serving as the determination threshold in S7 can be set as appropriate according to the touch detection accuracy required for the touch panel system 1 and the noise environment.
  • the drive pattern (measurement method) determined by the subsystem is not changed without changing the subsystem connected to the drive circuit 4. It is decided to drive (S8).
  • the drive pattern selected in S5 is the last selectable drive pattern, that is, the selectable subsystem It is determined whether or not another exists (S9).
  • the drive pattern selected in S5 is the last drive pattern that can be selected (YES in S9), among the actually used drive patterns, the result of the drive by the drive circuit 4 and the detection by the detection circuit 10 is the most extraneous noise. It is determined to drive with the drive pattern (measurement method) when the amount of is small (S8).
  • the drive pattern can be changed to reduce the influence of noise. Thereby, the touch detection accuracy of the touch panel system 1 can be improved.
  • ⁇ Other drive patterns> When driving the drive line by adding PM twice, in order to increase the interval between the first non-inversion measurement timing of V (n, k) and the second inversion measurement timing to 1/75 Hz. If a pause period is provided between the timing of the first non-inversion measurement of V (n, k) and the timing of the second inversion measurement, the period required to detect the touch input becomes longer. Although it is conceivable to reduce the number of samplings in order to shorten the period required to detect touch input, it is not preferable to reduce the number of samplings.
  • a pause period is provided between the timing of the first non-inversion measurement of V (n, k) and the timing of the second inversion measurement, and the first non-inversion measurement of V (n, k + 1) is performed during the pause period.
  • Perform inversion measurement As a result, the interval between the timing of the first non-inversion measurement and the timing of the second inversion measurement is reduced to 1/75 Hz without increasing the period required to detect touch input or reducing the number of samplings. By doing so, it is possible to take measures against display noise.
  • the first non-inversion measurement of V (n, k + 1) is performed in the pause period between the timing of the first non-inversion measurement of V (n, k) and the timing of the second inversion measurement.
  • the driving method of the touch panel system of the present embodiment is not limited to this, and the timing of the first non-inversion measurement and the timing of the second inversion measurement of V (n, k) is not limited to this.
  • Non-inversion measurement or inversion measurement of V (n, m) in the m-th row other than the k-th row may be performed during the rest period between the two.
  • the drive circuit sets the electrode line based on each row of the code sequence of K rows and P columns corresponding to the drive pattern.
  • a part of the driving period based on V (n, j) may overlap each other.
  • the drive circuit 4 decomposes V (n, k) into V (n, k) -P0 and V (n, k) -P1.
  • the drive line is driven in accordance with the sign. Therefore, by driving V (n, k) -P0 with PM and driving V (n, k) -P1 with MP, the charge / discharge operation can be performed even when the drive periods overlap each other. An increase in the number of times can be suppressed, and power consumption can be reduced.
  • FIG. 16 is a circuit diagram for explaining a driving method of the touch panel system according to the present embodiment.
  • the drive lines are driven in parallel, but the touch panel system 1a of the second embodiment is different from the touch panel system of the first embodiment in that the drive lines are sequentially driven.
  • the drive line drive is performed using a code sequence including “1” elements and “0” elements.
  • sequential drive can be considered as a kind of parallel drive, the first embodiment and Description of overlapping parts is omitted.
  • the touch panel system 1a of the present embodiment includes a touch panel controller 3a, and has the same configuration as the touch panel system 1 of the first embodiment except that the touch panel controller 3a includes a drive circuit 4a.
  • the drive circuit 4a of the touch panel system 1a of the present embodiment sequentially drives the drive lines DL1 to DL4.
  • FIG. 17 is a view for explaining mathematical formulas showing a driving method of the touch panel system according to the present embodiment.
  • the drive circuit 4 drives the drive lines DL1 to DL4 based on the 4 ⁇ 4 code sequence shown in Equation 10 of FIG. If the element of the code matrix is “1”, the drive circuit 4 applies the voltage Vdrive to the drive line, and if the element is “0”, it applies zero volts.
  • the amplifying circuit 7 receives and amplifies electrostatic capacity signal data Y1, Y2, Y3, and Y4 along the driving line driven by the driving circuit 4.
  • the driving circuit 4 applies the voltage Vdrive to the driving line DL1, and applies zero volts to the remaining driving lines DL2 to DL4. Then, for example, the signal data Y1 from the sense line SL3 corresponding to the capacitor C31 represented by Expression 8 in FIG.
  • the voltage Vdrive is applied to the drive line DL2, and zero volts is applied to the remaining drive lines DL1, DL3, and DL4. Then, the signal data Y2 from the sense line SL3 corresponding to the capacitor C32 represented by Expression 9 in FIG.
  • the voltage Vdrive is applied to the drive line DL3, and zero volts is applied to the remaining drive lines.
  • the voltage Vdrive is applied to the drive line DL4, and zero volts is applied to the remaining drive lines.
  • the signal data Y1, Y2, Y3, and Y4 themselves are associated with the capacitance values C1, C2, C3, and C4 of the capacitors, respectively.
  • the signal data Y1, Y2, Y3, and Y4 themselves are the capacitance values C1, C2, C3, and C4 of the capacitors, respectively.
  • the capacitances C1 to C4 are estimated by taking the inner product of the signal data Y1 to Y4 as in the case of parallel driving using the M-sequence code.
  • the drive circuit 4a of the touch panel controller 3a of the present embodiment drives a drive line based on each drive pattern defined by a plurality of subsystems, similarly to the drive circuit 4 of the first embodiment.
  • noise countermeasures can be taken against both external noise and display noise, and touch detection accuracy can be improved.
  • FIG. 18 is a timing chart for explaining another drive pattern of the touch panel system according to the present embodiment, and FIG. 18A shows a change in potential applied to the drive line when the drive line is driven by PM2 addition.
  • a pause period is provided between the timing of the first non-inversion measurement of V (n, k) and the timing of the second inversion measurement.
  • the first non-inversion measurement of V (n, k + 1) is performed.
  • the interval between the timing of the first non-inversion measurement and the timing of the second inversion measurement is reduced to 1/75 Hz without increasing the period required to detect touch input or reducing the number of samplings. By doing so, it is possible to take measures against display noise.
  • the first non-inversion measurement of V (n, k + 1) is performed in the pause period between the timing of the first non-inversion measurement of V (n, k) and the timing of the second inversion measurement.
  • the driving method of the touch panel system of the present embodiment is not limited to this, and the timing of the first non-inversion measurement and the timing of the second inversion measurement of V (n, k) is not limited to this.
  • Non-inversion measurement or inversion measurement of V (n, m) in the m-th row other than the k-th row may be performed during the rest period between the two.
  • the drive circuit sets the electrode line based on each row of the code sequence of K rows and P columns corresponding to the drive pattern.
  • a part of the driving period based on V (n, j) may overlap each other.
  • FIG. 19 is a circuit diagram showing a configuration of the touch panel system 1b according to the present embodiment.
  • the touch panel system of the first and second embodiments is a mutual capacitive touch panel system, but the touch panel system 1b of the third embodiment is different from the touch panel system of the first and second embodiments in that it is a self-capacitive touch panel system. ing.
  • the touch panel 2b includes sense lines SL1 to SL4 (electrode lines) provided along a first direction, and sense lines SL5 to SL8 (electrode lines) provided along a second direction orthogonal to the first direction.
  • the touch panel controller 3b includes a drive detection circuit 4b, a drive detection circuit 4c, a control circuit 14b that controls the drive detection circuit 4b and the drive detection circuit 4c, and a noise amount that estimates a noise amount mixed in a detection result by the detection circuit 10. And an estimation circuit 9.
  • the drive detection circuit 4b drives the sense lines SL1 to SL4 and detects a touch input based on signal data obtained by driving the sense lines SL1 to SL4.
  • the drive detection circuit 4c drives the sense lines SL5 to SL8, and detects a touch input based on signal data obtained by driving the sense lines SL5 to SL8.
  • the drive detection circuits 4b and 4c connect each sense line and the power supply voltage by switch control, and thereby charge according to a predetermined capacitance C5 (capacitance) included in the sense line.
  • the capacitance C5 is estimated based on the charge flowing from the sense line by connecting each sense line to a detection circuit (not shown) by switch control.
  • each sense line When a detection object such as a finger comes close to the sense line, the capacitance C6 of the detection object is added to the capacitance C5. Therefore, by connecting each sense line to the power supply voltage, Charges corresponding to the capacitances C5 and C6 are charged. Therefore, each sense line and a detection circuit (not shown) are connected by switch control, and the capacitance C6 can be detected based on the electric charge flowing from the sense line, and a touch input can be detected.
  • the control circuit 14b controls the operation of the drive detection circuits 4b and 4c. Specifically, the drive and detection timings of the sense lines SL1 to SL4 by the drive detection circuit 4b and the drive and detection timings of the sense lines SL5 to SL8 by the drive detection circuit 4b are controlled alternately.
  • the switching circuit 6 switches the subsystems 5a and 5b on the basis of the estimation result of the noise amount estimation circuit 9, and controls the drive pattern of the sense line, thereby displaying noise and external noise.
  • Noise countermeasures can be taken for both of these, and noise mixed in the detection results of the drive detection circuits 4b and 4c can be reduced.
  • the noise is controlled by controlling the drive timing (charge charge timing) for driving each sense line and the number of samplings, which is the number of times the charge is detected from each sense line. Can be reduced.
  • the sense line operating voltage is set to VDD / 2
  • the voltage (initialization voltage) applied to the sense line is set to either VDD (first polarity) or GND (second polarity)
  • the initialization voltage may be controlled as follows. That is, the case where the initialization voltage is set to VDD is defined as non-inversion measurement, and the case where the initialization voltage is set to GND is defined as inversion measurement.
  • the capacitance formed by the sense line can be detected by calculating a plurality of signal data.
  • a pause period may be provided between the two drive periods of each sense line to increase the drive period (measurement period). For example, an idle period having the same length as the drive period may be provided, and the drive cycle may be doubled. Thereby, power consumption can be reduced. However, since the touch input cannot be detected during the pause period, the response speed of the detection is lower than when no pause period is provided.
  • the sense lines may be divided into two or more groups, and the sense lines may be sequentially driven for each group.
  • the sense lines arranged in parallel to each other may be grouped into odd-numbered sense lines and even-numbered sense lines, and the driving timing (phase) may be shifted in each group and driven in two phases.
  • the sense lines SL1 and SL3 are set as the first group sense lines
  • the sense lines SL2 and SL4 are set as the second group sense lines
  • the sense lines SL1 and SL3 are driven in the first period.
  • the sense lines SL2 and SL4 may be driven in a second period following the first period. Note that the first group and the second group may be alternately driven once, or each group may be alternately driven twice.
  • the first group of sense lines is driven by VectorN
  • the second group of sense lines is performed by VectorN + 1. May be driven.
  • power consumption can be reduced compared to the case where all the sense lines are sequentially driven.
  • the sense lines of the first group or the second group are sequentially driven without providing a pause period, so that a decrease in detection response speed due to the pause period can be suppressed. .
  • the electronic device may be placed in a standby state, and driving using the above drive pattern may be performed in the standby state.
  • the sense lines are divided into groups and driven sequentially for each group, so the detection accuracy (resolution of touch position detection) is reduced, but when the user is not operating the electronic device, the high detection accuracy is Since it is not required, it is preferable to reduce the power consumption by driving with the above driving pattern.
  • the sense lines of each group are driven a plurality of times in each Vector, and a part of the driving period of VectorN and a part of the driving period of VectorN + 1 are mutually connected. You may overlap.
  • the first time is non-inverted measurement
  • the second time is inverted measurement
  • Non-inversion measurement the second time is non-inversion measurement.
  • a pause period is provided between the timing of the first non-inversion measurement of VectorN and the timing of the second inversion measurement, and the first non-inversion measurement of VectorN + 1 is performed during the pause period.
  • noise can be reduced by controlling the driving timing, the number of samples, the initializing potential of the sense line, etc. as driving patterns.
  • the configuration includes a plurality of sense lines provided along the first direction and a plurality of sense lines provided along the second direction orthogonal to the first direction.
  • the structure of the touchscreen system of this embodiment is not restricted to this.
  • the position coordinates of touch input cannot be detected, but at least the presence or absence of touch input can be detected.
  • the touch panel controller (3, 3a, 3b) is a touch panel controller that controls a touch panel (2, 2b) including one or more electrode lines (drive line DL, sense line SL). , A drive circuit (4, 4a, 4b, 4c) for driving the electrode line, and a change in the capacitance value of the capacitance (capacitor C) formed by the electrode line is detected in accordance with the driving of the electrode line.
  • the detection circuit (10), a plurality of drive defining units (subsystems 5a and 5b) each defining a drive pattern of the drive circuit, and the plurality of drive defining units are mixed in the detection result of the detection circuit.
  • the number of noise characterized in that it is configured to reduce the different frequencies of noise from the predetermined frequency.
  • the touch panel controller according to aspect 2 of the present invention is the touch panel controller according to aspect 1, in which the first drive defining unit defines the first drive pattern and the second drive defining unit is the second of the plurality of drive defining units.
  • a drive pattern is defined, and the first drive pattern and the second drive pattern are detected when the electrode line is driven based on noise input to the electrode line and each drive defining unit.
  • the input / output transfer characteristics representing the relationship with the noise mixed in the detection result by the circuit may be different from each other.
  • the touch panel controller according to aspect 3 of the present invention is the touch panel controller according to aspect 2, in which the drive circuit drives the electrode lines N times (N is an integer of 2 or more) in the drive pattern defined by at least one of the drive defining units.
  • the detection circuit calculates N pieces of signal data corresponding to the capacitance value obtained by driving the electrode line N times, whereby the capacitance of the capacitance formed by the electrode line is calculated. It may be configured to detect a change in capacitance value.
  • the influence of noise is reduced and the touch detection accuracy is improved by detecting the change in the capacitance value by calculating N signal data as the electrode line is driven N times. Can be made.
  • the touch panel controller according to Aspect 4 of the present invention is the touch panel controller according to Aspect 3, wherein, in the drive pattern defined by at least one of the drive defining units, when the predetermined frequency is Fs, at least of the N driving timings. Any one of the drive timing intervals may be k / Fs (k is an integer of 2 or more).
  • the input / output transfer characteristic of the drive pattern can be an input / output transfer characteristic capable of attenuating the noise of the predetermined frequency. Thereby, the influence of the noise of the predetermined frequency can be reduced.
  • the touch panel controller according to Aspect 5 of the present invention is the touch panel controller according to Aspect 4, wherein the drive circuit drives the electrode line N times in the drive pattern defined by at least one of the drive defining units.
  • the driving frequency may be Fs / k.
  • the input / output transfer characteristic of the drive pattern can be an input / output transfer characteristic capable of attenuating the noise of the predetermined frequency. Thereby, the influence of the noise of the predetermined frequency can be reduced.
  • the touch panel controller according to Aspect 6 of the present invention is the touch panel controller according to any one of Aspects 3 to 5, in which the drive circuit has K rows and P columns corresponding to the drive pattern in the drive pattern defined by at least one of the drive defining units.
  • the electrode lines are sequentially driven N times for each row of the code sequence, a driving period based on the i-th row (1 ⁇ i ⁇ K) of the code sequence, and the code sequence
  • the drive period based on other rows other than the i-th row may be configured to overlap at least partially.
  • the influence of noise can be reduced by calculating N signal data and detecting a change in capacitance value, and the time required for detecting touch input can be shortened. it can.
  • the touch panel controller according to Aspect 7 of the present invention is the touch panel controller according to any one of Aspects 3 to 6, wherein the drive circuit performs N times of driving of the electrode lines in the drive pattern defined by at least one of the drive defining units.
  • the detection circuit is divided into a first drive for applying a first polarity potential to the electrode line and a second drive for applying a second polarity potential to the electrode line, and the detection circuit drives the electrode line N times.
  • the signal data obtained by applying the potential of the second polarity to the electrode line in the second drive is ⁇ 1.
  • the N signal data may be calculated by multiplying by N.
  • the input / output transmission characteristics of the drive pattern can be changed by combining the first drive and the second drive. Thereby, it is possible to take measures against noises of various frequencies.
  • the touch panel controller according to aspect 8 of the present invention is the touch panel controller according to any one of the above aspects 3 to 7, wherein the plurality of drive defining units generate the N signal data calculated by the detection circuit as the drive pattern.
  • a sampling number that is the number of times the electrode line is driven is determined, and the sampling number that is defined by the first drive defining unit and the sampling number that is defined by the second drive defining unit are different from each other. There may be.
  • the input / output transfer characteristics of the drive pattern can be changed by combining drive patterns that define different sampling numbers. Thereby, it is possible to take measures against noises of various frequencies.
  • a touch panel system is a touch panel system including the touch panel controller according to any one of the above aspects 1 to 8 and a touch panel, wherein the touch panel intersects with the electrode line in a plan view. Line, and a capacitor formed between the electrode line and the sense line, and the detection circuit detects a change in capacitance value of the capacitor as the electrode line is driven by the drive circuit.
  • the structure to detect may be sufficient.
  • multi-touch can be detected by using a mutual capacitive touch panel system as the touch panel system.
  • a touch panel system is a touch panel system including the touch panel controller according to any one of the above aspects 1 to 8 and a touch panel, wherein the detection circuit drives the electrode line by the drive circuit.
  • capacitance formed between a detection target object and the said electrode line accompanying with may be sufficient.
  • An electronic device (100) includes a touch panel including one or more electrode lines, a display panel (92b) in which display of a plurality of pixels is sequentially updated, and any one of the above aspects 1 to 8.
  • Each of the plurality of drive patterns has a predetermined frequency generated at a predetermined cycle based on a timing at which the display of the pixels is sequentially updated. It may be configured to reduce noise.

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

Abstract

La présente invention améliore la précision de détection de toucher en effectuant des contre-mesures de bruit pour à la fois le bruit d'une fréquence prescrite et le bruit d'autres fréquences. Afin de réduire le bruit qui est compris dans les résultats de détection d'un circuit de détection (10), la présente invention sélectionne un sous-système (5a, 5b) et commute le modèle d'attaque d'un circuit d'attaque (4). Chacun modèle d'attaque d'une pluralité de modèles d'attaques est réglé de manière à réduire le bruit d'une fréquence prescrite et le bruit d'une fréquence qui est différente de la fréquence prescrite.
PCT/JP2016/070408 2015-07-14 2016-07-11 Contrôleur de panneau tactile, système de panneau tactile, et appareil électronique WO2017010453A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013246556A (ja) * 2012-05-24 2013-12-09 Asahi Kasei Electronics Co Ltd タッチセンサの信号処理回路、およびタッチセンサ
JP2014132445A (ja) * 2012-12-05 2014-07-17 Japan Display Inc タッチ検出機能付き表示装置、その駆動方法及び電子機器
JP2015122125A (ja) * 2015-04-01 2015-07-02 株式会社ジャパンディスプレイ タッチ検出機能付き表示パネルおよびその駆動方法、駆動回路、ならびに電子機器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013246556A (ja) * 2012-05-24 2013-12-09 Asahi Kasei Electronics Co Ltd タッチセンサの信号処理回路、およびタッチセンサ
JP2014132445A (ja) * 2012-12-05 2014-07-17 Japan Display Inc タッチ検出機能付き表示装置、その駆動方法及び電子機器
JP2015122125A (ja) * 2015-04-01 2015-07-02 株式会社ジャパンディスプレイ タッチ検出機能付き表示パネルおよびその駆動方法、駆動回路、ならびに電子機器

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