WO2014129091A1 - Contrôleur de panneau tactile, circuit intégré, dispositif à panneau tactile et appareil électronique - Google Patents

Contrôleur de panneau tactile, circuit intégré, dispositif à panneau tactile et appareil électronique Download PDF

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Publication number
WO2014129091A1
WO2014129091A1 PCT/JP2013/085158 JP2013085158W WO2014129091A1 WO 2014129091 A1 WO2014129091 A1 WO 2014129091A1 JP 2013085158 W JP2013085158 W JP 2013085158W WO 2014129091 A1 WO2014129091 A1 WO 2014129091A1
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Prior art keywords
touch panel
linear sum
capacitance
panel controller
noise
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PCT/JP2013/085158
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English (en)
Japanese (ja)
Inventor
雄亮 金澤
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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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • 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
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the present invention relates to a touch panel controller and an integrated circuit in which the touch panel controller is integrated.
  • the present invention also relates to a touch panel device including a touch panel controller and an electronic device including the touch panel controller.
  • Patent Document 1 As a device for detecting capacitance values distributed in a matrix, the distribution of capacitance values in a capacitance matrix formed between M drive lines and L sense lines is detected ( A touch panel device to be estimated) is disclosed in Patent Document 1.
  • the touch panel device described in Patent Document 1 when the user touches the touch panel with a finger, a pen, or the like, the user detects a change in capacitance value (for example, becomes smaller) at the touched position. Detects the touched position on the touch panel.
  • FIG. 6 is a circuit diagram showing a configuration of the touch panel system 51 according to Patent Document 1. As shown in FIG.
  • the touch panel system 51 includes a touch panel 52 and a touch panel controller 53.
  • capacitances C11 to C44 are formed at positions where the drive lines DL1 to DL4, the sense lines SL1 to SL4, and the drive lines DL1 to DL4 and the sense lines SL1 to SL4 intersect.
  • the touch panel controller 53 is provided with a drive unit 54.
  • the drive unit 54 is expressed by equation (1).
  • the drive lines DL1 to DL4 are driven based on the orthogonal code sequence of 4 rows and 4 columns shown in FIG.
  • the element of the orthogonal code sequence is either “1” or “ ⁇ 1”.
  • the drive unit 54 applies the voltage Vdrive when the element of the orthogonal code sequence is “1”, and applies ⁇ Vdrive when the element is “ ⁇ 1”.
  • the voltage Vdrive may be a power supply voltage, for example, but may be a voltage other than the power supply voltage.
  • An example of the “orthogonal code sequence” is a Hadamard matrix generated by the sylvester method.
  • the Hadamard matrix by the Sylvester method creates a basic unit of 2 rows and 2 columns as a basic structure.
  • the upper right, upper left, and lower left bits of the basic unit are the same, and the lower right is an inversion of these bits.
  • a basic element of 2 rows and 2 columns is set as one block and arranged at the upper right, the upper left, the lower right, and the lower left, respectively, to create a code of a bit array of 4 rows and 4 columns.
  • the lower right block is bit-inverted with respect to the other blocks.
  • Equation (1) a bit array code of 8 rows and 8 columns and 16 rows and 16 columns is generated.
  • Such a matrix is an example satisfying the definition of the “orthogonal code sequence”.
  • the 4-by-4 orthogonal code sequence shown in Equation (1) is a 4-row ⁇ 4-column Hadamard matrix by the Sylvester method.
  • the Hadamard matrix is a square matrix whose elements are either 1 or -1 and whose rows are orthogonal to each other. That is, any two rows of the Hadamard matrix represent vectors that are perpendicular to each other.
  • orthogonal code sequence can use a matrix obtained by arbitrarily extracting N rows from an M-dimensional Hadamard matrix (where N ⁇ M). Further, a Hadamard matrix by a method other than the Sylvester method can be applied as follows.
  • a Hadamard matrix by a method other than the Sylvester method can also be used as an orthogonal code sequence.
  • the touch panel system 51 has four amplifiers 55 arranged at positions corresponding to the sense lines SL1 to SL4, respectively.
  • the amplifier 55 receives and amplifies the linear sum signals Y1, Y2, Y3, and Y4 output from the capacitance sense line driven by the drive unit.
  • the drive unit 54 applies the voltage Vdrive to all the drive lines DL1 to DL4 in the first drive among the four times of the four-row, four-column orthogonal code sequence.
  • the measured value Y1 output from the sense line SL3 expressed by the following equation (2) is amplified by the amplifier 55.
  • the drive unit 54 applies the voltage Vdrive to the drive lines DL1 and DL3, and applies -Vdrive to the drive lines DL2 and DL4.
  • the measured value Y2 output from the sense line SL3 expressed by the following formula (3) is amplified by the amplifier 55.
  • the drive unit 54 applies the voltage Vdrive to the drive lines DL1 and DL2, and applies -Vdrive to the drive lines DL3 and DL4. As a result, the measured value Y3 output from the sense line SL3 is amplified by the amplifier 55. Further, in the fourth drive, the drive unit 54 applies the voltage Vdrive to the drive lines DL1 and DL4, and applies ⁇ Vdrive to the drive lines DL2 and DL3. As a result, the measured value Y4 output from the sense line SL3 is amplified by the amplifier 55.
  • the capacitances C31 to C34 of the touch panel system 51 shown in FIG. 6 are estimated by the following equations (4) and (5). Specifically, as shown in Expression (4), by performing an inner product calculation of the measurement values Y1, Y2, Y3, and Y4 and the orthogonal code sequence, as shown in Expression (5), the capacitance C1 ⁇ C4 can be estimated.
  • the capacitances C31 to C34 are indicated by C1 to C4 for simplification of explanation. Further, for simplification of description, the coefficient ( ⁇ Vdrive / Cint) is omitted for the measured values Y1 to Y4.
  • the object of the present invention has been made in view of the above problems, and its main object is to provide a touch panel controller capable of more accurately estimating the capacitance.
  • the touch panel controller includes M drive lines (M is an integer of 2 or more) and M sense lines formed between one sense line and the M drive lines. Capacitance is driven in parallel by N M-dimensional vectors (N is an integer and M ⁇ N), and a linear sum signal based on the charges accumulated in the M capacitances is output from the sense line.
  • the controller wherein the drive unit drives the capacitance in parallel K times (K is an integer of 2 or more) by one M-dimensional vector of the N M-dimensional vectors, and the sense K pieces from the line
  • a signal processing unit that outputs a shape sum signal and generates a noise-reduced linear sum signal in which noise mixed in the linear sum signal is reduced based on a reference value derived from the K linear sum signals
  • the inner product calculation unit estimates the value of the M electrostatic capacitances by an inner product calculation of the noise-reduced linear sum signal generated by the signal processing unit and the N M-dimensional vectors.
  • the signal processing unit derives a reference value from the K linear sum signals output from the sense line by the driving unit, and mixes in the linear sum signal based on the reference value.
  • a noise-reduced linear sum signal in which the generated noise is reduced is generated.
  • the inner product calculation unit uses the noise-reduced linear sum signal for inner product calculation with the N M-dimensional vectors when estimating the M capacitance values.
  • the inner product calculation unit estimates the capacitance using the noise-reduced linear sum signal in which noise mixed in the linear sum signal is reduced. An error from the capacity can be reduced. Accordingly, the touch panel controller can more accurately estimate the capacitance.
  • FIG. 1 is a circuit diagram showing a configuration of a touch panel device 1 according to the present embodiment.
  • the touch panel device 1 includes a touch panel controller 10 and a touch panel 20.
  • the touch panel 20 receives a user's touch operation.
  • the touch panel 20 includes M drive lines DL1 to DLM arranged parallel to each other at a predetermined interval, and L lines arranged at predetermined intervals in parallel to each other so as to be orthogonal to the drive lines DL1 to DLM.
  • the touch panel controller 10 controls driving of the touch panel 20. Further, the touch panel controller 10 detects a user touch operation on the touch panel 20 and a position on the touch panel 20 touched by the user.
  • the touch panel controller 10 includes a drive unit 110, an amplifier 120, an AD conversion unit 130, a signal processing unit 140, and an inner product calculation unit 150.
  • touch panel controller 10 may be realized by a single integrated circuit. Thereby, the space in the touch panel apparatus 1 for mounting the touch panel controller 10 can be minimized.
  • M is an integer of 2 or more
  • the electrostatic capacitances C1i to CMi are driven in parallel by N M-dimensional vectors (code sequences).
  • the driving unit 110 outputs a linear sum signal based on the charges accumulated in the M electrostatic capacitors C1i to CMi from the certain one sense line SLi.
  • code sequences D1 to DM having a sequence length N having a low correlation with each other are input to the drive unit 110.
  • the drive unit 110 switches the value of the voltage to be applied to each of the M drive lines DL1 to DLM N times according to each value of the input code series D1 to DM. Details of the code sequences D1 to DM input to the drive unit 110 will be described later.
  • the drive unit 110 applies the voltage “Vdrive” to the corresponding drive line DLj, and the value of the code sequence Dj is “ ⁇ ”. In the case of “1”, the voltage “ ⁇ Vdrive” is applied to the corresponding drive line DLj.
  • the driving unit 110 switches the voltages to be applied to the M drive lines DL1 to DLM according to the input code sequences D1 to DM, and drives the M capacitances C1i to CMi in parallel. . Accordingly, the driving unit 110 outputs a linear sum signal based on the charges accumulated in the M electrostatic capacitances C1i to CMi from a certain sense line SLi.
  • the driving unit 110 sets the capacitances C1i to CMi K times (K is 2 or more) by one M-dimensional vector among N M-dimensional vectors (N is an integer and M ⁇ N). (Integer integer) is driven in parallel, and a linear sum signal is output K times from a single sense line SLi.
  • the amplifier 120 amplifies the linear sum signal output from the connected sense line SLi.
  • the sense lines SL1 to SLL are connected to corresponding amplifiers 120 (1) to 120 (L), respectively.
  • Each of the amplifiers 120 (1) to 120 (L) amplifies the linear sum signal input from the connected sense lines SL1 to SLL, and converts the amplified linear sum signal to the corresponding AD conversion unit 130 (1).
  • the amplified linear sum signal output from the amplifier 120 is also referred to as an output signal OUTt.
  • AD conversion unit 130 converts the amplified linear sum signal input from the amplifier 120 from an analog signal to a digital signal (hereinafter also simply referred to as AD conversion).
  • the amplifiers 120 (1) to 120 (L) are connected to corresponding AD converters 130 (1) to 130 (L), respectively.
  • Each AD conversion unit 130 (1) to 130 (L) AD-converts the amplified linear sum signals input from the connected amplifiers 120 (1) to 120 (L), respectively, and corresponding signal processing units Output to 140 (1) to 140 (L).
  • the signal processing unit 140 derives a reference value from the K output signals OUTt supplied from the amplifier 120, reduces noise mixed in the output signal OUTt based on the derived reference value (noise reduction processing), and reduces noise. Generate a linear sum signal. Details of the noise reduction processing will be described later.
  • the method for deriving the reference value is not particularly limited.
  • the reference value may be a median of K linear sum signals or an arithmetic average value of K linear sum signals.
  • the linear sum signal (noise reduced linear sum signal) subjected to noise reduction processing by the signal processing unit 140 is supplied to the inner product calculation unit 150.
  • the inner product calculation unit 150 performs an inner product calculation of the linear sum signal output from one sense line SLi and input via the amplifier 120, the AD conversion unit 130, and the signal processing unit 140, and N M-dimensional vectors. By executing, the values of the M electrostatic capacitances Ci1 to CiM are estimated.
  • Djt represents a code sequence input to the drive unit 110
  • Cint represents the integration capacity of the amplifier 120.
  • the inner product calculation unit 150 calculates the inner product of the code sequence D1t and the output signal OUTt. Specifically, the inner product calculation unit 150
  • T represents the period of the code sequence.
  • the capacitance value C1i is obtained.
  • the inner product calculation unit 150 performs the inner product calculation with another code sequence to obtain the capacitance values C11 to CM1.
  • the output signal OUTt of the amplifier 120 uses the noise signal as Vnoise.
  • the estimated value of the capacitance value of the capacitance C1i includes
  • the driving unit 110 does not change the value of the code sequence (that is, by one M-dimensional vector), and does one sense line SLi (that is, the capacitances C1i to CMi). ) Is driven a plurality of times, and a linear sum signal is output a plurality of times from the one sense line SLi.
  • the amplifier 120 amplifies a plurality of linear sum signals output from a certain sense line SLi, and outputs an output signal OUTt a plurality of times.
  • the value of the code sequence for driving one drive line DLj in the drive unit 110 is assumed to be Dj1. Further, the number of output signals OUTt output from the amplifier 120 is K times (that is, the capacitances C1i to CMi are driven K times by one M-dimensional vector).
  • the output signal OUTt of the amplifier 120 is
  • Vnoise indicating the noise signal component fluctuates when the noise is not low frequency noise.
  • the signal processing unit 140 outputs, as a reference value, the median of K output signals OUTt (one value corresponding to the center when the observation values are arranged in order of magnitude, or the arithmetic average of two values at the center). Noise reduction processing is performed on the signal OUTt. Specifically, the signal processing unit 140 reduces noise of the output signal OUTt by performing processing for removing signals having an extremely large size on the K output signals OUTt using a median filter.
  • the output signals are OUTB1 to OUTB8.
  • the signal processing unit 140 sets the average value of the values of the fourth and fifth output signals OUTB4 and OUTB5 counted from the smallest value of the rearranged output signals OUTBi as the “reference value”. Filter. Further, the signal processing unit 140 performs filtering by replacing the output signal OUTBi having a value 20% or more larger than the reference value or the output signal OUTBi having a value smaller by 20% or more with the reference value.
  • the signal processing unit 140 uses the median of the K output signals OUTt as the reference value, thereby being influenced by the output signal OUTt in which extremely large noise is mixed among the K output signals OUTt.
  • a noise-reduced linear sum signal can be generated and output.
  • FIG. 2 is a diagram illustrating an example of a code sequence input to the drive unit 110 according to the present embodiment.
  • the integration capacitance Cint of the amplifier 120 is 1 (pF), and the voltage Vdrive is 1 (V).
  • FIG. 3 shows the output signal OUTt output from the amplifier 120 and the noise-reduced linear sum signal output from the signal processing unit 140 in the touch panel device 1 according to the present embodiment.
  • FIG. 3 shows the number of times t (times) of driving of the capacitance C1i at a certain time in the touch panel device 1 according to the present embodiment (where t is the subscript “t” in the output signal OUTt (that is, the electrostatic capacity of the driving unit 110) 6 is a graph showing signal characteristics with respect to the number of times of driving of the capacitor C1i).
  • a dotted line A1 indicates the characteristic of the output signal OUTt of the amplifier 120 with respect to the number of times t of driving of the capacitance C1i at a certain time.
  • a solid line A2 indicates the characteristic of the noise-reduced linear sum signal OUTCi of the signal processing unit 140 with respect to the number of driving times t of the capacitance C1i at a certain time.
  • the output signal OUTt of the amplifier 120 includes noise, and the signal value fluctuates greatly every time the capacitance C1i is driven.
  • the signal processing unit 140 can generate and output a noise-reduced linear sum signal OUTCi with reduced noise by performing noise reduction processing on the output signal OUTt.
  • FIG. 4 is a graph illustrating characteristics of the estimation result of the capacitance Cji in the touch panel device 1 according to the present embodiment.
  • a solid line A3 indicates actual values of the capacitances C11 to C15 formed between the drive lines DL1 to DL5 and one sense line SL1.
  • a dotted line A4 indicates the values of the capacitances C11 to C15 estimated by the inner product calculation of the output signal OUTt and the code sequence Dj.
  • An alternate long and short dash line A5 indicates the values of the capacitances C11 to C15 estimated by the inner product calculation of the noise reduction linear sum signal OUTCi and the code sequence Dj.
  • the estimation result when the capacitance Cji is estimated by the inner product operation of the output signal OUTt and the code sequence Dj is as follows:
  • the touch panel device 1 performs noise reduction processing on the output signal OUTt in the signal processing unit 140, thereby obtaining an actual capacitance Cji and an estimated capacitance Cji.
  • the error can be reduced. Therefore, the touch panel controller 10 included in the touch panel device 1 according to the present embodiment can estimate the capacitance more accurately.
  • the code sequence is an orthogonal sequence
  • the code sequence may be an M sequence, a Gold sequence, a bulk sequence, or the like.
  • the driving unit 110 has been described by taking as an example a configuration in which the capacitance Cji is driven K times continuously by one M-dimensional vector out of N M-dimensional vectors. Is not limited to this.
  • K 8 8 but when noise is concentrated in a short time, noise is mixed in all eight output signals OUTt output from the amplifier 120, and signal processing is performed. The case where the effect of the noise reduction process in the part 140 is not sufficiently obtained can be considered.
  • the drive unit 110 in the touch panel device 1 includes two consecutive code sequences Dj1 and Dj2 (that is, one M-dimensional vector out of N M-dimensional vectors and another one A plurality of output signals OUTt are obtained for each of the code sequences Dj1 and Dj2 using an (M-dimensional vector).
  • K output signals OUTt are obtained from the code sequence Dj1 and K output signals OUTt are obtained from the code sequence Dj2 in accordance with the driving of the touch panel 20 by the drive unit 110.
  • the output signal OUTt of the amplifier 120 is
  • the amplifier 120 includes the K output signals OUTt (OUTt, OUTt + 2, OUTt + 4,..., OUTt + 2K ⁇ 2) based on the code sequence Dj1, and the K output signals OUTt (OUTt + 1, OUTt + 3) based on the code sequence Dj2. ,..., OUTt + 2K ⁇ 1) are output.
  • the driving unit 110 drives the electrostatic capacitance Cji with one code sequence Dj1 discontinuously by driving the electrostatic capacitance Cji alternately using the two code sequences Dj1 and Dj2. Will be done.
  • the period during which the signal processing unit 140 acquires the output signal OUTt from the amplifier 120 via the AD conversion unit 130 is from t to t + 2K ⁇ 1, and the capacitance Cji is driven by only one code sequence Dj1. It becomes longer than the period (from t to K-1).
  • the touch panel device 1 according to the present embodiment can appropriately perform the noise reduction processing of the output signal OUTt in the signal processing unit 140 even when noise is concentrated in a short time.
  • the touch panel controller 10 included in the touch panel device 1 according to the present embodiment can reduce an error between the actual electrostatic capacitance Cji and the estimated electrostatic capacitance Cji.
  • the touch panel controller 10 can more accurately estimate the capacitance.
  • the driving unit 110 may drive the electrostatic capacitance Cji a predetermined number of times by the code sequence Dj1, and then drive the electrostatic capacitance Cji a predetermined number of times by the code sequence Dj2, and alternately repeat this.
  • the configuration in which the capacitance Cji is driven by two consecutive code sequences Dj1 and Dj2 has been described as an example.
  • the present invention is not limited to this.
  • the capacitance Cji may be driven using two non-consecutive code sequences such as code sequences Dj1 and Dj3, or, for example, three or more code sequences Dj1, Dj2, and Dj4.
  • the electrostatic capacitance Cji may be driven using the code sequence.
  • the configuration in which the capacitance Cji is driven K times by each of the two code sequences Dj1 and Dj2 has been described as an example.
  • the present invention is not limited to this.
  • a electrostatic capacitances Cji are driven in parallel, of which A times (A is an integer of 2 or more) are electrostatic capacitances by the code sequence Dj2. What is necessary is just to drive Cji.
  • the value of the code sequence for driving one drive line DLj in the drive unit 110 is Dj1, and the output signal OUTt of the amplifier 120 is obtained K times (that is, one of M M-dimensional vectors). Capacitances C1i to CMi are driven K times by M-dimensional vectors).
  • the output signal OUTt of the obtained amplifier 120 is the same as in the first embodiment.
  • the signal processing unit 140 can reduce the noise of the output signal OUTt of the amplifier 120 using the arithmetic average of the K output signals OUTt as a reference value.
  • the touch panel controller 10 included in the touch panel device 1 according to the present embodiment can reduce an error between the actual capacitance Cji and the estimated capacitance Cji.
  • the capacity can be estimated more accurately.
  • FIG. 5 is a block diagram showing a main configuration of the mobile phone 300 according to the present embodiment.
  • the mobile phone 300 includes a touch panel device 1, a CPU 310, a ROM 311, a RAM 312, a camera 313, a microphone 314, a speaker 315, an operation key 316, a display control circuit 317, and a display panel 318. It has.
  • the components of the mobile phone 300 are connected to each other by a data bus.
  • the touch panel device 1 includes a touch panel controller 10 and a touch panel 20. Note that the touch panel device 1 (the touch panel controller 10 and the touch panel 20) included in the mobile phone 300 according to the present embodiment is the same as the touch panel device 1 according to the first embodiment, and thus description thereof is omitted here.
  • the CPU 310 comprehensively controls the operation of the mobile phone 300.
  • the CPU 310 controls the operation of the mobile phone 300 by executing a program stored in the ROM 311.
  • a ROM (Read Only Memory) 311 is a readable and non-writable memory that stores fixed data such as a program executed by the CPU 310 such as an EPROM (Erasable Programmable Read-Only Memory).
  • a RAM (Random Access Memory) 312 is a readable and writable memory, such as a flash memory, in which variable data such as data referred to by the CPU 310 for calculation or data generated by the CPU 310 is stored. .
  • the operation key 316 receives an instruction input from the user to the mobile phone 300. Data input via the operation key 316 is stored in the RAM 312 in a volatile manner.
  • the camera 313 shoots a subject based on a shooting instruction input by the user via the operation key 316.
  • Image data of a subject photographed by the camera 313 is stored in the RAM 312 or an external memory (for example, a memory card).
  • the microphone 314 receives user's voice input.
  • the input voice data (analog data) indicating the voice of the user is converted into digital data in the mobile phone 300 and sent to another mobile phone (communication partner).
  • the speaker 315 outputs sound represented by music data stored in the RAM 312 or the like, for example.
  • the display control circuit 317 drives the display panel 318 to display an image represented by the image data stored in the ROM 311 or the RAM 312 based on a user instruction input via the operation key 316.
  • the display panel 318 may be provided so as to overlap the touch panel 20, or may include the touch panel 20, and the configuration thereof is not particularly limited.
  • the mobile phone 300 may further include an interface (IF) (not shown) for wired connection with other electronic devices.
  • IF interface
  • the mobile phone 300 according to the present embodiment includes the touch panel device 1, it is possible to estimate the capacitance more accurately, and thus it is possible to operate the touch panel controller satisfactorily. Therefore, since the mobile phone 300 can recognize the touch operation by the user more accurately, the mobile phone 300 can more accurately execute the process desired by the user.
  • the touch panel controller 10 includes the M static lines formed between the M drive lines DLj (M is an integer of 2 or more) and one sense line SLi.
  • the capacitances C1i to CMi are driven in parallel by N M-dimensional vectors (N is an integer and M ⁇ N), and a linear sum signal based on the charges accumulated in the M capacitances C1i to CMi is obtained.
  • the values of the M capacitances C1i to CMi are calculated by an inner product calculation of the driving unit 110 that outputs the sense line SLi and the linear sum signal output from the sense line SLi and the N M-dimensional vectors.
  • the touch panel controller 10 includes an inner product calculation unit 150 for estimation, wherein the driving unit 110 uses a single M-dimensional vector of the N M-dimensional vectors to calculate a previous value.
  • Capacitances C1i to CMi are driven in parallel K times (K is an integer of 2 or more), K linear sum signals are output from the sense lines SLi, and a reference value derived from the K linear sum signals
  • a signal processing unit 140 that generates a noise-reduced linear sum signal in which noise mixed in the linear sum signal is reduced
  • the inner product operation unit 150 includes a noise-reduced linearity generated by the signal processing unit 140.
  • the values of the M electrostatic capacitances C1i to CMi are estimated by an inner product operation of the sum signal and the N M-dimensional vectors.
  • the signal processing unit derives a reference value from the K linear sum signals output from the sense line by the driving unit, and mixes in the linear sum signal based on the reference value.
  • a noise-reduced linear sum signal in which the generated noise is reduced is generated.
  • the inner product calculation unit uses the noise-reduced linear sum signal for inner product calculation with the N M-dimensional vectors when estimating the M capacitance values.
  • the inner product calculation unit estimates the capacitance using the noise-reduced linear sum signal in which noise mixed in the linear sum signal is reduced. An error from the capacity can be reduced. Accordingly, the touch panel controller can more accurately estimate the capacitance.
  • the driving unit according to aspect 1 is configured such that the capacitance is continuously paralleled K times by the one M-dimensional vector of the N M-dimensional vectors. It may be driven.
  • the driving unit outputs K linear sum signals continuously from the sense line.
  • the inner product calculation unit calculates the value of the M electrostatic capacitances by calculating the inner product of the K noise-reduced linear sum signals continuously generated by the signal processing unit and the N M-dimensional vectors. Can be estimated. Therefore, the touch panel controller can more accurately estimate the capacitance based on the K linear sum signals continuously obtained from the sense lines.
  • the drive unit according to aspect 1 may drive K capacitances in parallel by one M-dimensional vector out of the N M-dimensional vectors, so that K linear Before obtaining the sum signal, the capacitances are driven in parallel at least K + A times, of which A times (A is an integer of 2 or more) is determined by another M-dimensional vector among the N M-dimensional vectors.
  • the capacitance may be driven.
  • the driving unit drives the capacitance for a long period of time even when noise is mixed in the linear sum signal in a short period of time.
  • the drive unit can output a linear sum signal that does not contain noise even when noise is mixed in most of the linear sum signals that are obtained in a short period of time.
  • the touch panel controller can remove noise that is concentrated in a short time and estimate the capacitance more accurately.
  • the reference value in the aspects 1 to 3 may be a value derived by a median of the K linear sum signals.
  • the signal processing unit uses a value derived by a median of the K linear sum signals as the reference value. Accordingly, the signal processing unit can generate a noise-reduced linear sum signal without being affected by a linear sum signal mixed with extremely large noise among the K linear sum signals.
  • the integrated circuit according to aspect 4 of the present invention integrates the touch panel controller according to aspects 1 to 3.
  • the touch panel controller is integrated in an integrated circuit, a space for mounting the touch panel controller can be minimized.
  • a touch panel device includes the touch panel controller according to aspects 1 to 3 and a touch panel controlled by the touch panel controller.
  • An electronic device includes the touch panel controller according to aspects 1 to 3 and a touch panel controlled by the touch panel controller.
  • the present invention can be suitably applied to an electronic device including a touch panel controller, such as a touch panel device, a smartphone, an electronic blackboard, and a touch panel personal computer.
  • a touch panel controller such as a touch panel device, a smartphone, an electronic blackboard, and a touch panel personal computer.

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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

Un aspect de la présente invention porte sur un contrôleur de panneau tactile (10) qui comprend : une unité d'attaque (110) qui soumet des condensateurs (Cji) à K itérations d'attaque parallèle conformément à un vecteur de dimension M parmi N vecteurs de dimension M, et délivre K signaux de somme linéaire par des lignes de détection (SLi) ; des unités de traitement de signal (140) qui génèrent des signaux de somme linéaire à réduction de bruit ; et des unités de calcul de produit intérieur (150) qui, par calcul de produit intérieur des signaux de somme linéaire à réduction de bruit et des N vecteurs de dimension M, estiment la valeur de M condensateurs.
PCT/JP2013/085158 2013-02-25 2013-12-27 Contrôleur de panneau tactile, circuit intégré, dispositif à panneau tactile et appareil électronique WO2014129091A1 (fr)

Applications Claiming Priority (2)

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JP2013034999 2013-02-25
JP2013-034999 2013-02-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016062597A (ja) * 2014-09-19 2016-04-25 株式会社 ハイディープ スマートフォン

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012118957A (ja) * 2010-11-12 2012-06-21 Sharp Corp 線形素子列値推定方法、静電容量検出方法、集積回路、タッチセンサシステム、及び電子機器
JP2012247870A (ja) * 2011-05-25 2012-12-13 Sharp Corp 静電容量推定方法、集積回路、及び電子機器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012118957A (ja) * 2010-11-12 2012-06-21 Sharp Corp 線形素子列値推定方法、静電容量検出方法、集積回路、タッチセンサシステム、及び電子機器
JP2012247870A (ja) * 2011-05-25 2012-12-13 Sharp Corp 静電容量推定方法、集積回路、及び電子機器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016062597A (ja) * 2014-09-19 2016-04-25 株式会社 ハイディープ スマートフォン

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