JP5864621B2 - Touch sensor system and electronic device - Google Patents

Description

  The present invention relates to a touch sensor system that estimates or detects a coefficient, element value, or capacitance of a linear system configured in a matrix, and an electronic apparatus.

  A device for detecting linear element values distributed in a matrix, for example, a capacitance matrix Cij (i = 1,..., M, j = 1) formed between M drive lines and L sense lines. ,..., L) is disclosed in Patent Document 1 as a touch sensor device (contact detection device) that detects a distribution of capacitance values. This touch sensor device operates by a scanning detection method in which drive lines are selected in order and the value of a linear element connected to the selected drive line is detected.

  Further, a plurality of drive lines are driven by being divided into a first drive line group and a second drive line group based on a time-series code sequence, and are connected to sense lines. Outputs a measurement voltage obtained by converting the total current generated in the capacitance at the intersection of each into an electrical signal, performs a product-sum operation on the sense line for each sense line, and a voltage value corresponding to the capacitance at each intersection Patent Document 2 discloses a capacitance detection circuit for obtaining the above.

  Currently, touch panel systems are rapidly being installed in various electronic devices such as mobile information devices such as smartphones and vending machines such as vending machines.

  In the electronic device, there is a demand for a technique for preventing a malfunction caused by unintended contact of an object with the touch panel.

  For example, when the hand holding the electronic device is operated by a hand and the hand holding the electronic device touches the touch panel, it is determined that the touch is a touch of the touch panel. Due to this determination, there is a risk of malfunction in the electronic device. A malfunction due to such a mechanism is expected to occur when the electronic device is a portable device such as a smartphone, a tablet terminal, or a laptop computer, which impairs user convenience.

  FIG. 22 is a diagram for explaining the above mechanism. As shown in FIG. 22, when a hand (object) 73 having the tablet terminal 71 comes into contact with the touch panel 72 of the tablet terminal 71, it is determined that this contact is a touch on the touch panel 72. Convenience will be impaired.

  It is considered that the problem of malfunction due to such a mechanism becomes more apparent as the width of the frame with respect to the display screen on which the touch panel is arranged becomes narrower.

  Patent Document 6 discloses a technique for preventing such a malfunction that a constant coordinate position is continuously detected even though the touch panel is not touched.

  In the input device disclosed in Patent Document 6, when the period during which the same coordinate position is detected continues for a predetermined period, the difference between the detection value based on the change in the electrostatic field between the electrodes and the reference value is a predetermined value. If it is within the range of the update detection width, the reference value is updated to the detection value. The reference value referred to here is a value serving as a reference for determining the presence or absence of touch based on the detected value. If the detected value at a certain coordinate position is greater than or equal to the reference value or exceeds the reference value, it is considered that the touch on the coordinate position has been performed.

  Thereby, in the input device disclosed in Patent Document 6, it is possible to prevent such a malfunction that the constant coordinate position is continuously detected even though the touch panel is not touched. Furthermore, it is considered that the detection sensitivity can be improved by detecting the presence or absence of a touch based on the updated reference value.

Japanese Patent Publication “Japanese Patent Laid-Open No. 2010-92275 (published on April 22, 2010)” Japanese Patent Publication “Patent No. 4364609 Specification (published on June 16, 2005)” Japanese Patent Publication “Patent No. 4387773 (published on June 16, 2005)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2005-114362 (published on April 28, 2005)” Japanese Patent Publication “JP 2005-134240 A (published May 26, 2005)” Japanese Patent Publication “JP 2007-286814 A” (published on November 1, 2007)

  However, in the touch sensor device that operates according to the scanning detection method described in Patent Document 1, when a given time for acquiring a two-dimensionally distributed capacitance value is T and the number of scans is m, The process of selecting a plurality of lines simultaneously and scanning them to detect the capacitance of the capacitance matrix Cij must be completed during time (T / m).

  In general, the accuracy of the detection process can be increased as the processing time is increased, for example, by averaging or the like, but in order for the touch sensor device to follow a high-speed operation, the time given for acquiring the capacitance value It is necessary to reduce T, and in order to increase the resolution, it is necessary to increase the number of scans m. In any case, there is a problem that the processing time (T / m) decreases and the detection accuracy deteriorates.

  Further, in the capacitance detection circuit described in Patent Document 2, in order to cancel the offset error of the measurement voltage, the first detection line and the second drive line are driven based on the code sequence, and the first detection line is driven. The measurement voltage based on driving of the second drive line is subtracted from the measured voltage based on driving of the drive line (Patent Document 2: Paragraphs [0058] to [0061] of the specification). However, such a configuration has a problem that it is disadvantageous in speeding up with reduced power consumption because the calculation process takes two phases.

  In the input device disclosed in Patent Document 6, the reference value is updated to a detected value exceeding the reference value. For this reason, there are cases where the detected value that is greater than or equal to the reference value before the update, or less than the reference value after the update, is treated as a value that is less than or equal to the reference value. To do.

  That is, in the input device disclosed in Patent Document 6, the criteria for determining whether or not a touch is performed before and after the update of the reference value is different. As a result, the touch of the touch panel is not determined as a touch, and thus there is a problem that the sensitivity for detecting the presence or absence of the touch may be reduced.

  An object of the present invention is to provide a linear system coefficient estimation method, a linear element array value estimation method, a capacitance detection method, an integrated circuit, a touch sensor system, which can achieve high-speed operation with good detection accuracy, good resolution, and To provide electronic equipment.

  Another object of the present invention is to provide a touch panel system capable of preventing malfunction caused by unintended contact of an object with respect to the touch panel while suppressing a decrease in sensitivity for detecting the presence or absence of touch on the touch panel. is there. Still another object of the present invention is to provide an electronic device including the touch panel system.

In order to solve the above-described problem, the touch sensor system according to the present invention includes a first capacitance column C1i (i = 1,...) Formed between M drive lines and one sense line. M) and each of the second capacitance columns C2i (i = 1,..., M) formed between the M drive lines and the other sense line. Based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N constituted by +1 or −1, when the code sequence is +1 + V volts, and in the case of -1, the M drive lines are driven in parallel so as to apply -V volts, and the output sFirst = (s11, s12, ..., from the first capacitance string) s1N) and the output sSe from the second capacitance string ond = (s21, s22,..., s2N), and the first capacitance column corresponding to the k1st drive line based on the inner product calculation of the output sFirst and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on an inner product operation of the output sSecond and the code sequence di; When a touch line corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row, and the same portion of the touch panel is touched once continuously for a predetermined period, corresponding to the touch of the one, and a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel, the touch invalidation unit, to correspond to a predetermined time period It is determined whether or not the touch has continued for a touch time threshold that is a time, and the touch invalidation unit responds to a next touch on the location when the location is continuously touched for a predetermined period of time. The touch disabling unit invalidates the instruction , and the level of the signal indicating the degree of contact of the object with the location is equal to or higher than a touch reference threshold serving as a reference for the level, or the touch reference threshold Is determined to be touching the location, the touch invalidating unit increases the touch reference threshold when the location is continuously touched for a predetermined period, The level of the signal of the touch is set to be equal to or lower than the increased touch reference threshold value .

  With this feature, the touch invalidation unit invalidates an instruction to the electronic device by this touch when the same portion on the touch panel is continuously touched for a predetermined period. Thereby, for example, when an unintended contact of an object with respect to the touch panel continues, such as when a hand holding an electronic device touches the touch panel, an instruction based on the touch is not performed. For this reason, it becomes possible to prevent the malfunctioning resulting from the unintended contact of the object with respect to a touch panel.

  Moreover, according to said structure, in order to prevent said malfunctioning, it is not necessary to change the judgment criteria of whether the touch is performed. Therefore, it is possible to suppress a decrease in sensitivity for detecting the presence or absence of touch.

Another touch sensor system according to the present invention includes a first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M A touch panel including a second capacitance column C2i (i = 1,..., M) formed between one drive line and another sense line, and an integrated circuit that controls the touch panel. The integrated circuit includes the first capacitance column C1i (i = 1,..., M) and the second capacitance column C2i (i = 1,...). For each of M), based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, each element consisting of +1 or -1. If the code sequence is +1, + V volts, if it is -1, The M drive lines are driven in parallel so as to apply V volts, and the output from the first capacitance string sFirst = (s11, s12,..., S1N), and the second static Based on the inner product calculation of the output sFirst and the code sequence di based on the drive unit that outputs the output sSecond = (s21, s22,..., S2N) from the capacitance string, the first drive line The capacitance value of the first capacitance string is estimated, and the capacitance value of the second capacitance string corresponding to the k2nd drive line is estimated based on the inner product calculation of the output sSecond and the code sequence di. an estimation unit that, when the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, for an electronic apparatus having the touch panel A touch invalidation unit that invalidates the display, and the touch invalidation unit determines whether or not the touch has continued for a touch time threshold that is a time corresponding to a predetermined period, and the touch invalidation. The unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period, and the touch invalidation unit determines the degree of contact of the object with the location. When the level of the signal to be displayed is equal to or higher than the touch reference threshold value serving as a reference for the level or exceeds the touch reference threshold value, it is determined that the touch is performed on the location, and the touch invalidation unit Is characterized in that, when the location is continuously touched for a predetermined period, the touch reference threshold is increased so that the level of the signal of the touch is equal to or lower than the increased touch reference threshold. To do.

Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and For each of the second capacitance columns Ci2 (i = 1,..., M) formed between the M drive lines and the other sense line, each element is +1 or −1. Based on the configured code sequence di = (di1, di2,..., DiN) (i = 1,..., M) having a length of N, the M drive lines are driven in parallel, and the first The output sFirst = (s11, s12,..., S1N) from one capacitance string and the output sSecond = (s21, s22,... S2N) from the second capacitance string to an analog integrator An output drive unit, the output sFirst and the output Based on the inner product operation with the signal sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and based on the inner product operation between the output sSecond and the code sequence di, a touch sensor system including an estimation unit that estimates a capacitance value of the second capacitance string corresponding to a k-th drive line, and the drive unit is configured such that when the code sequence is +1, When the analog integrator is reset, the drive line is driven by the first voltage at the time of sampling the outputs from the first and second capacitance strings, and when the code sequence is −1. The drive line is driven by the second voltage when the analog integrator is reset, and by the first voltage when the output from the first and second capacitance columns is sampled. A touch panel that corresponds to the drive line and the sense line and the first capacitance column and the second capacitance column, when the same point in the touch panel is touched one time continuously for a predetermined time period, A touch invalidation unit that invalidates an instruction to the electronic device equipped with the touch panel in response to the one touch, and the touch invalidation unit has a touch time threshold value that is a time corresponding to a predetermined period. during determines whether the touch continues, the touch invalidation unit, when the point is touched continuously for a predetermined time period, and disabling the instruction according to the following touch on relevant section The touch disabling unit is configured such that the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level, or exceeds the touch reference threshold. The touch disabling unit increases the touch reference threshold when the location is continuously touched for a predetermined period of time, and determines that the touch is being performed. The signal level is set to be equal to or lower than the increased touch reference threshold value .

Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and For each of the second capacitance columns Ci2 (i = 1,..., M) formed between the M drive lines and the other sense line, each element is +1 or −1. Based on the configured code sequence di = (di1, di2,..., DiN) (i = 1,..., M) having a length of N, the M drive lines are driven in parallel, and the first The output sFirst = (s11, s12,..., S1N) from one capacitance string and the output sSecond = (s21, s22,... S2N) from the second capacitance string to an analog integrator An output drive unit, the output sFirst and the output Based on the inner product operation with the signal sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and based on the inner product operation between the output sSecond and the code sequence di, a touch sensor system including an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2th drive line, wherein the driving unit includes the first and second capacitance strings. Before outputting the output from the analog integrator, the drive line is driven by the first voltage when the analog integrator is reset and when the output from the first and second capacitance columns is sampled. The outputs from the first and second capacitance strings are output to the analog integrator, and the outputs from the first and second capacitance strings are output as offset outputs from the analog integrator. The touch panel corresponding to the drive line, the sense line, the first capacitance string, and the second capacitance string, and the same portion of the touch panel continues for a predetermined period. when it is touched once Te, according to the touch of the one, further comprising a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel, the touch invalidation unit, the predetermined time period The touch invalidation unit determines whether or not the touch has continued for a touch time threshold that is a corresponding time, and the touch invalidation unit, when the location is continuously touched for a predetermined period, The touch invalidation unit invalidates the instruction according to the level of the signal indicating the degree of contact of the object with the location is equal to or higher than a touch reference threshold value serving as a reference for the level, or Determines that the location is touched when the touch reference threshold is exceeded, and the touch disabling unit determines that the touch reference threshold is touched when the location is continuously touched for a predetermined period of time. Is increased so that the level of the signal of the touch becomes equal to or lower than the increased touch reference threshold .

Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and A touch panel including a second capacitance column Ci2 (i = 1,..., M) formed between M drive lines and another sense line; and an integrated circuit that controls the touch panel; The integrated circuit includes the first capacitance column Ci1 (i = 1,..., M) and the second capacitance column Ci2 (i = 1,...). , M) based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, each element consisting of +1 or −1. And driving the M drive lines in parallel, Drive that outputs the output sFirst = (s11, s12,..., S1N) from the capacitance string and the output sSecond = (s21, s22,..., S2N) from the second capacitance string to the analog integrator. And the output value sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the output sSecond and the code sequence di And an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the inner product calculation with the second product line, and the drive unit has the code sequence of the +1 In this case, the drive line is driven by the first voltage when the analog integrator is reset, and by the second voltage when sampling the outputs from the first and second capacitance columns, When the code sequence is −1, the drive line is driven by the second voltage when the analog integrator is reset and by the first voltage when sampling the outputs from the first and second capacitance strings. The integrated circuit, when the same part on the touch panel is touched once continuously for a predetermined period, disables the touch to invalidate the instruction to the electronic device equipped with the touch panel in response to the single touch. The touch invalidation unit determines whether or not the touch has continued for a touch time threshold value that is a time corresponding to a predetermined period. When the touch is continued for a predetermined period, the instruction corresponding to the next touch on the location is invalidated, and the touch invalidation unit is a signal indicating the degree of contact of the object with the location When the level is equal to or higher than the touch reference threshold that is the reference of the level or exceeds the touch reference threshold, it is determined that the touch is performed on the location, and the touch invalidation unit When the location is continuously touched for a predetermined period, the touch reference threshold is increased so that the level of the signal of the touch is equal to or lower than the increased touch reference threshold .

Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and A touch panel including a second capacitance column Ci2 (i = 1,..., M) formed between M drive lines and another sense line; and an integrated circuit that controls the touch panel; The integrated circuit includes the first capacitance column Ci1 (i = 1,..., M) and the second capacitance column Ci2 (i = 1,...). , M) based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, each element consisting of +1 or −1. And driving the M drive lines in parallel, Drive that outputs the output sFirst = (s11, s12,..., S1N) from the capacitance string and the output sSecond = (s21, s22,..., S2N) from the second capacitance string to the analog integrator. And the output value sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the output sSecond and the code sequence di And an estimation unit that estimates a capacitance value of the second capacitance column corresponding to the k2nd drive line based on the inner product calculation with the first and second drive units. Before outputting the output from the capacitance string to the analog integrator, the first voltage is output when the analog integrator is reset and when the output from the first and second capacitance strings is sampled. And driving the drive line to output the outputs from the first and second capacitance strings to the analog integrator, and using the outputs from the first and second capacitance strings as an offset output. stored in the memory is read from said analog integrator, the integrated circuit, when the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, with the touch panel It further includes a touch invalidation unit that invalidates an instruction to the electronic device, and the touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period, The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period, and the touch invalidation unit When the level of the signal indicating the degree of contact of the object is equal to or higher than the touch reference threshold value that is the reference of the level, or exceeds the touch reference threshold value, it is determined that the touch is performed on the location. The touch disabling unit increases the touch reference threshold when the location is continuously touched for a predetermined period, and the signal level of the touch becomes equal to or less than the increased touch reference threshold. It is characterized by doing so .

Still another touch sensor system according to the present invention includes a first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and For each of the second capacitance columns C2i (i = 1,..., M) formed between the M drive lines and the other sense line, each element is +1 or −1. Based on the configured code sequence of length N di = (di1, di2,..., DiN) (i = 1,..., M), + V volts when the code sequence is +1, and −1 Drives the M drive lines in parallel so as to apply −V volts, and outputs sFirst = (s11, s12,..., S1N) from the first capacitance string, and the second SSecond = (s21, s22 ..., s2N), and based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, Based on an inner product operation of the output sSecond and the code sequence di, an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line, the drive line, the sense line, When the touch panel corresponding to the first capacitance row and the second capacitance row and the same portion of the touch panel are touched once continuously for a predetermined period , the touch is accepted. A touch invalidation unit that invalidates an instruction to the electronic device including the touch panel, wherein the touch invalidation unit is a time corresponding to a predetermined period. During determines whether the touch continues, the touch invalidation unit, when the point is touched continuously for a predetermined time period, and disabling the instruction according to the following touch on relevant section The touch invalidation unit, when the level of the signal indicating the degree of contact of the object to the location is equal to or higher than the touch reference threshold that is a reference of the level, or exceeds the touch reference threshold, The touch disabling unit determines that a touch is made on the location, and the touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period of time, thereby increasing the signal level of the touch. Is less than or equal to the touch reference threshold after the increase .
Still another touch sensor system according to the present invention includes a first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and A touch panel including a second capacitance column C2i (i = 1,..., M) formed between the M drive lines and another sense line, and an integrated circuit that controls the touch panel; The integrated circuit includes the first capacitance column C1i (i = 1,..., M) and the second capacitance column C2i (i = 1,...). , M) based on a length N code sequence di = (di1, di2,..., DiN) (i = 1,. If the code sequence is +1, it is + V volts, and if it is -1, it is-. The M drive lines are driven in parallel so as to apply a bolt, and an output sFirst = (s11, s12,..., S1N) from the first capacitance string and the second electrostatic capacitance Based on the inner product operation of the output sFirst and the code sequence di based on the drive unit that outputs the output sSecond = (s21, s22,..., S2N) from the capacitor string, the first corresponding to the k1st drive line The capacitance value of the second capacitance string corresponding to the k2th drive line is estimated based on the inner product calculation of the output sSecond and the code sequence di. an estimation unit, when the same point in the touch panel is touched one time continuously for a predetermined period of time, finger with respect to the electronic apparatus including according to the touch of the one, the touch panel A touch disabling unit that disables the touch, and the touch disabling unit determines whether or not the touch has continued for a touch time threshold that is a time corresponding to a predetermined period, and the touch disabling unit When the location is continuously touched for a predetermined period, the instruction corresponding to the next touch on the location is invalidated, and the touch invalidation unit indicates the degree of contact of the object with the location When the level of the signal is equal to or higher than the touch reference threshold value that is a reference for the level or exceeds the touch reference threshold value, it is determined that the touch is performed on the location, and the touch invalidating unit When the location is continuously touched for a predetermined period, the touch reference threshold is increased so that the signal level of the touch is equal to or lower than the increased touch reference threshold. .
Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and For each of the second capacitance columns Ci2 (i = 1,..., M) formed between the M drive lines and the other sense line, each element is +1 or −1. Based on the configured code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, the M drive lines are driven in parallel, and the first Output from the capacitance string sFirst = (s11, s12,..., S1N) and output sSecond = (s21, s22,..., S2N) from the second capacitance string are output to the analog integrator. Drive unit, output sFirst and code sequence Based on the inner product calculation with i, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and based on the inner product calculation between the output sSecond and the code sequence di, And an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the drive line of the drive line, wherein the drive unit is configured to output the analog when the code sequence is +1. When the integrator is reset, the drive line is driven by the first voltage when the output from the first and second capacitance strings is sampled, and when the code sequence is −1, When the integrator is reset, the drive line is driven by the second voltage, and when the output from the first and second capacitance columns is sampled, the drive line is driven by the first voltage. A touch panel corresponding to the line and the sense line and the first capacitance column and the second capacitance column, when the same point in the touch panel is touched one time continuously for a predetermined time period, this A touch invalidation unit that invalidates an instruction to the electronic device equipped with the touch panel in response to a single touch, the touch invalidation unit between a touch time threshold that is a time corresponding to a predetermined period Determining whether or not the touch has continued, the touch disabling unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period of time , The touch disabling unit is configured such that the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold serving as a reference for the level, or exceeds the touch reference threshold. The touch invalidation unit determines that the touch is performed on the location, and increases the touch reference threshold when the location is continuously touched for a predetermined period of time. The level is set to be equal to or lower than the increased touch reference threshold value .
Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and For each of the second capacitance columns Ci2 (i = 1,..., M) formed between the M drive lines and the other sense line, each element is +1 or −1. Based on the configured code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, the M drive lines are driven in parallel, and the first Output from the capacitance string sFirst = (s11, s12,..., S1N) and output sSecond = (s21, s22,..., S2N) from the second capacitance string are output to the analog integrator. Drive unit, output sFirst and code sequence Based on the inner product calculation with i, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and based on the inner product calculation between the output sSecond and the code sequence di, A touch sensor system including an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the drive line of the first and second capacitance strings, wherein the driving unit is connected to the first and second capacitance strings. Driving the drive line with a first voltage at the time of resetting the analog integrator and sampling the output from the first and second capacitance columns before outputting an output to the analog integrator; Outputs from the first and second capacitance strings are output to the analog integrator, and outputs from the first and second capacitance strings are read from the analog integrator as offset outputs. Stored in the memory, a touch panel corresponding to the driveline and said sense line and the first capacitance column and the second capacitance column, once the same point in the touch panel is continued for a predetermined time period when it is touched, according to the touch of the one, further comprising a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel, the touch invalidation unit time corresponding to a predetermined time period It is determined whether or not the touch is continued during a touch time threshold value, and the touch invalidation unit responds to a next touch on the location when the location is continuously touched for a predetermined period of time. The touch invalidation unit invalidates the instruction, and the touch invalidation unit has a signal level indicating the degree of contact of the object with the location being equal to or higher than a touch reference threshold that is a reference for the level, or the touch. When the touch reference threshold is exceeded, it is determined that the touch is performed on the location, and the touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period. Thus, the level of the signal of the touch is set to be equal to or lower than the increased touch reference threshold value .
Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and A touch panel including a second capacitance column Ci2 (i = 1,..., M) formed between M drive lines and another sense line; and an integrated circuit that controls the touch panel; The integrated circuit includes the first capacitance column Ci1 (i = 1,..., M) and the second capacitance column Ci2 (i = 1,...). , M) based on a length N code sequence di = (di1, di2,..., DiN) (i = 1,. Driving the M drive lines in parallel to form the first capacitance; SFirst == (s11, s12,..., S1N) and the output sSecond = (s21, s22,..., S2N) from the second capacitance string to an analog integrator; Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di And an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation, and the drive unit is configured such that when the code sequence is +1, Driving the drive line with a first voltage when the analog integrator is reset, and with a second voltage when sampling the output from the first and second capacitance columns, If the column is −1, the drive line is driven by the second voltage when the analog integrator is reset, and by the first voltage when sampling the outputs from the first and second capacitance columns, the integrated circuit, when the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one-time touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel The touch invalidation unit determines whether or not the touch has continued for a touch time threshold that is a time corresponding to a predetermined period, and the touch invalidation unit determines that the location is within a predetermined period. When the touch is continued, the instruction corresponding to the next touch on the location is invalidated, and the touch invalidation unit is configured to output a signal level indicating the degree of contact of the object with the location. Is determined to be touched with respect to the location when the level is equal to or higher than the touch reference threshold serving as a reference for the level or exceeds the touch reference threshold, and the touch invalidating unit When the touch is continuously touched for a predetermined period, the touch reference threshold is increased so that the level of the signal of the touch is equal to or lower than the increased touch reference threshold .
Still another touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and A touch panel including a second capacitance column Ci2 (i = 1,..., M) formed between M drive lines and another sense line; and an integrated circuit that controls the touch panel; The integrated circuit includes the first capacitance column Ci1 (i = 1,..., M) and the second capacitance column Ci2 (i = 1,...). , M) based on a length N code sequence di = (di1, di2,..., DiN) (i = 1,. Driving the M drive lines in parallel to form the first capacitance; SFirst == (s11, s12,..., S1N) and the output sSecond = (s21, s22,..., S2N) from the second capacitance string to an analog integrator; Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di And an estimation unit that estimates a capacitance value of the second capacitance row corresponding to the k2nd drive line based on the calculation, and the driving unit includes the first and second capacitances. Before the output from the column is output to the analog integrator, the analog voltage is reset by the first voltage and the output from the first and second capacitance columns is sampled by the first voltage. Driving the drive line, outputting the output from the first and second capacitance strings to the analog integrator, and using the output from the first and second capacitance strings as the offset output, the analog An integrated circuit reads out from an integrator and stores it in a memory, and the integrated circuit includes an electronic device provided with the touch panel in response to a single touch when the same portion of the touch panel is continuously touched once for a predetermined period. A touch invalidation unit that invalidates an instruction to the touch, wherein the touch invalidation unit determines whether or not the touch has continued for a touch time threshold that is a time corresponding to a predetermined period, and the touch When the location is continuously touched for a predetermined period, the invalidation unit invalidates the instruction according to the next touch on the location, and the touch invalidation unit detects the object to the location. When the level of the signal indicating the degree of contact is equal to or higher than the touch reference threshold that is the reference of the level or exceeds the touch reference threshold, it is determined that the touch is performed on the location, The touch disabling unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. It is characterized by that.
An electronic apparatus according to the present invention includes the touch sensor system according to the present invention and a display panel that is disposed so as to overlap the touch panel provided in the touch sensor system or that includes the touch panel. And

  The touch sensor system according to the present invention includes a touch invalidation unit that invalidates an instruction to an electronic device including the touch panel according to the touch when the same portion of the touch panel is continuously touched for a predetermined period. It is the composition which is.

  Therefore, there is an effect that it is possible to prevent malfunction caused by unintentional contact of an object with respect to the touch panel while suppressing a decrease in sensitivity for detecting presence or absence of touch on the touch panel.

It is a circuit diagram which shows the structure of the touch sensor system which concerns on embodiment. It is a block diagram which shows the structure of the estimation part of the integrated circuit provided in the said touch sensor system. It is a figure for demonstrating the drive method of the sensor panel provided in the said touch sensor system. It is a timing chart for demonstrating the drive method of the said sensor panel. It is a figure for demonstrating the specific example of the orthogonal code series input into the sensor panel provided in the said touch sensor system. It is a figure for demonstrating the other specific example of the said orthogonal code sequence. It is a figure for demonstrating the other specific example of the said orthogonal code sequence. 6 is a timing chart for explaining a method of driving a sensor panel provided in the touch sensor system according to the second embodiment. 12 is another timing chart for explaining a method of driving a sensor panel provided in the touch sensor system according to the second embodiment. 10 is a diagram for explaining a method for driving a sensor panel according to Embodiment 3. FIG. (A) And (b) is a figure for demonstrating the code series for driving the sensor panel which concerns on Embodiment 4. FIG. FIG. 10 is a diagram for describing a code sequence for driving a sensor panel according to a fifth embodiment. It is a graph which shows the method of driving the said sensor panel. (A) is a figure for demonstrating the code sequence based on M series which concerns on embodiment, (b) is a figure which shows the specific example of the code sequence based on M sequence. It is a functional block diagram which shows the structure of the mobile telephone carrying the said touch sensor system. It is a graph which shows one Example which invalidates a touch operation by the touch invalidation part which concerns on Embodiment 7 of this invention. It is a block diagram which shows schematic structure of the touchscreen system which concerns on Embodiment 7 of this invention. It is a flowchart which shows one Example which invalidates a touch operation by the touch invalidation part which concerns on Embodiment 7 of this invention. It is a graph which shows another Example which invalidates touch operation by the touch invalidation part which concerns on Embodiment 7 of this invention. It is a block diagram which shows an example of schematic structure of the electronic device which concerns on Embodiment 7 of this invention. (A) And (b) is a figure which shows another Example which invalidates a touch operation by the touch invalidation part which concerns on Embodiment 7 of this invention. It is a figure explaining an example of the mechanism in which the malfunctioning resulting from the unintended contact of the object with respect to the conventional touch panel generate | occur | produces.

  One embodiment of the touch sensor system of the present invention will be described below with reference to FIGS.

(Embodiment 1)
(Configuration of Touch Sensor System According to Embodiment)
FIG. 1 is a circuit diagram illustrating a configuration of a touch sensor system 1 according to an embodiment. The touch sensor system 1 includes a sensor panel 2 and an integrated circuit 3 that controls the sensor panel 2. The sensor panel 2 includes M drive lines DL1 to DLM arranged parallel to each other at a predetermined interval along the horizontal direction and a predetermined interval parallel to each other along a direction intersecting the drive lines. Are arranged in a matrix of M rows and L columns between each of the L sense lines SL1 to SLL and each of these M drive lines DL1 to DLM and each of the L sense lines SL1 to SLL. Capacitance Cij (i = 1 to M, j = 1 to L).

  The integrated circuit 3 has a drive unit 4 connected to M drive lines DL1 to DLM. The integrated circuit 3 is provided with an estimation unit 5. FIG. 2 is a block diagram illustrating a configuration of the estimation unit 5 of the integrated circuit 3.

  The estimation unit 5 includes L analog integrators 6 connected to the L sense lines SL1 to SLL, a switch 7 connected to the L analog integrators 6, and an AD conversion connected to the switch 7. A product 8, an inner product calculation unit 9 connected to the AD converter 8, and a RAM 10 connected to the inner product calculation unit 9. The analog integrator 6 includes an operational amplifier having one input grounded, an integration capacitor of a capacitor Cint disposed between the output of the operational amplifier and the other input, a transistor coupled to the other input of the operational amplifier, This transistor and another transistor connected in parallel are included.

  The integrated circuit 3 includes an application processing unit 11 that is connected to the inner product calculation unit 9 and executes a gesture recognition process (such as ARM) at 240 Hz. As described above, the integrated circuit 3 includes both an analog circuit and a digital circuit.

(Operation of conventional touch sensor system)
Before specifically explaining the operation of the present embodiment, the operation in the conventional configuration described in Patent Document 1 will be confirmed. Consider detection of a capacitance matrix Cij (i = 1,..., M, j = 1,..., L) formed between M drive lines and L sense lines. First, consider scan detection in which drive lines are selected one by one.

Capacitance Cij (j = 1,... L) connected to the selected drive line is charged to V volts and a signal of Cij × V is stored. If the gain when reading this signal via the sense line is G, the detection signal is
G × Cij × V (Formula 1)
It becomes.

(Operation of the touch sensor system of the present embodiment)
FIG. 3 is a diagram for explaining a driving method of the sensor panel 2 provided in the touch sensor system 1. The same components as those described above with reference to FIGS. 1 and 2 are denoted by the same reference numerals. Detailed description of these components will not be repeated.

  As an embodiment of the present invention, first, a code sequence di = (di1, di2,..., DiN) (i = 1,. To do. Here, the code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of the code length N is “orthogonal” means that the code sequence di satisfies the following conditions. Say.

  Based on the code sequence di, the drive unit 4 parallels the M drive lines DL1 to DLM so that + V volts are applied in the case of +1 and -V volts are applied in the case of -1. To drive. Then, a signal having a charge of ± Cij · V is stored in each capacitance Cij (i = 1 to M, j = 1 to L) according to each element (+1 or −1) of the code sequence.

  Next, charge addition is performed along the connection of the sense lines with respect to the signal represented by the charge accumulated in each capacitance connected to the same sense line, and is read by the analog integrator 6 for each sense line, and the output series vector sj = (sj1, sj2,..., sjN) (j = 1,..., L) is obtained.

FIG. 4 is a timing chart for explaining a driving method of the sensor panel 2. First,
The integration signal Cint of the analog integrator 6 is reset by the reset signal, and each capacitance arranged in a matrix on the sensor panel 2 is also reset. Here, the reset means that the electric charge accumulated in the capacitor is discharged. When the drive lines DL1 to DLM are driven in parallel at Vref + V or Vref−V according to +1 or −1 which is the value of the code sequence d11, d21, d31,. Charges of ± CV corresponding to the elements ± 1 of the code sequence are stored. Next, charge addition is performed along the connection of the sense lines with respect to signals represented by the charges accumulated in the respective capacitances connected to the same sense line, and the analog integrator 6 reads out the signals for each sense line. The output from the analog integrator 6 includes

(In this circuit, G = −1 / Cint)
Therefore, the output from the analog integrator 6 is AD converted by the AD converter 8 based on the sampling signal.

  The output sequence vector sji is

And

When an inner product operation di · sj between the code sequence di and the output sequence vector sj is performed,

  Comparing the above (Equation 1) and (Equation 2), it can be seen that a detection signal that is N times larger than the conventional scanning readout method can be obtained by the method of the present embodiment.

  When the analog integrator 6 shown in FIGS. 1 and 2 (a charge integrator using an operational amplifier using an integration capacitor Cint) is used as a sense line readout method, the gain G becomes (1 / Cint).

  As described above, the driving unit 4 of the integrated circuit 3 includes the first capacitance string Cip (p is 1 or more and (L−1) or less, i = 1,..., M), and the second capacitance string. For each of Ciq (p <q, q is 2 or more and L or less, i = 1,..., M), each of the elements is +1 or −1 and a length N orthogonal code sequence di = (di1 , Di2,..., DiN) (i = 1,..., M), M drive lines are applied to apply + V volts when the code sequence is +1 and −V volts when −1. Drive in parallel. Then, an output sFirst = (sp1, sp2,..., SpN) from the first capacitance string and an output sSecond = (sq1, sq2,..., SqN) from the second capacitance string are output. .

  Then, the output sFirst = (sp1, sp2,..., SpN) from the first capacitance string is integrated by the corresponding analog integrator 6 and output from the second capacitance string. sSecond = (sq1, sq2,..., sqN) is integrated by the analog integrator 6 provided correspondingly. The switch 7 sequentially switches the analog integrator 6 corresponding to each of the sense lines SL <b> 1 to SLL, and supplies an output from the capacitance string integrated by each analog integrator 6 to the AD converter 8.

  Specifically, first, the output sp1 is read from the first capacitance string to the analog integrator 6 and integrated, and at the same time, the output sq1 from the second capacitance string is transferred to the other analog integrator 6. Read and integrate. The switch 7 is connected to the analog integrator 6 and supplies the output sp1 read and integrated to the ADC 8. Next, the switch 7 disconnects the connection with the analog integrator 6 and connects to the other analog integrator 6, and supplies the read and integrated output sq 1 to the ADC 8. Thereafter, the output sp2 is read from the first capacitance string to the analog integrator 6 and integrated. At the same time, the output sq2 is read from the second capacitance string to the other analog integrator 6 and integrated. Is done. The switch 7 is connected to the analog integrator 6 and supplies the output sp2 read and integrated to the ADC 8. Next, the switch 7 releases the connection with the analog integrator 6 and connects to the other analog integrator 6, and supplies the output sq <b> 2 read and integrated to the ADC 8. In this way, the output spN and the output sqN are sequentially supplied to the ADC 8 by the analog integrator 6 and the switch 7. Further, the analog integrators 6 of all the sense lines operate in parallel with driving of the drive lines.

  The AD converter 8 AD-converts the output from the capacitance string integrated by the analog integrator 6 and supplies it to the inner product calculation unit 9.

  The inner product calculation unit 9 refers to the data stored in the RAM 10 based on the inner product calculation of the output sFirst and the code sequence di, and refers to the first static line corresponding to the k1th drive line (1 ≦ k1 <M). A capacitance value of the capacitance string is estimated, and the second capacitance string corresponding to the k2th drive line (k1 <k2, 1 <k1 ≦ M) based on the inner product calculation of the output sSecond and the code sequence di The capacity value of is estimated.

  The application processing unit 11 executes gesture recognition processing based on the capacitance value estimated by the inner product calculation unit 9 and generates a gesture command.

(Specific example of code sequence)
FIG. 5 is a diagram for explaining a specific example of orthogonal code sequences input to the sensor panel. Specific examples of the orthogonal code sequence di having the length N include the following code sequences.

  A Hadamard matrix, which is a typical orthogonal code sequence, is generated by the sylvester method shown in FIG. As a basic structure, a basic unit of 2 rows × 2 columns is made. 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.

  Next, the above-described 2 × 2 basic elements are combined as four blocks in the upper right, upper left, lower right, and lower left to create a code of a bit array of 4 rows × 4 columns. Here, as in the creation of the 2 × 2 basic unit, the lower right block is bit-inverted. The code of the bit arrangement of 8 rows × 8 columns and 16 rows × 16 columns is generated in the same procedure. These matrices satisfy the above-described definition of “orthogonal” in the present invention.

  In the present embodiment, for example, if the sensor panel 2 has 16 drive lines, the codes of the 16 × 16 bit arrangement shown in FIG. 5 can be used as orthogonal code sequences. Here, the Hadamard matrix refers to 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.

  As the orthogonal code sequence according to the present embodiment, a matrix obtained by arbitrarily extracting M rows from the Nth-order Hadamard matrix can be used (where M ≦ N). As described below, a Hadamard matrix by a method other than the Sylvester method can also be applied to the present invention.

  FIG. 6 is a diagram for explaining another specific example of orthogonal code sequences, and FIG. 7 is a diagram for explaining another specific example of orthogonal code sequences. An N-order Hadamard matrix by the Sylvester method is a power of N = 2, but if N is a multiple of 4, there is an expectation that a Hadamard matrix exists. For example, in FIG. FIG. 7 shows the Hadamard matrix when N = 20. Hadamard matrices obtained by methods other than these Sylvester methods can also be used as orthogonal code sequences according to the present embodiment.

(Actual product operation)
The inner product matrix C′ij = di · sj is calculated according to the following procedure.
(1) First, the inner product matrix stored in the RAM 10 (FIG. 2) of the estimation unit 5 is reset to C′ij = 0.
(2) The i-th (i = 1,..., M) drive line DLi is driven in parallel with the voltage V × dik at the timing of time tk (one of k = 1,. Is charged with a charge Cij × V × dik.
(3) Each sense line j (j = 1,..., L) is connected to the corresponding analog integrator 6, and the output voltage sjk from the capacitance charged at time tk is read out. The L output voltages sjk read at time tk respectively read by the corresponding L analog integrators 6 are supplied to the AD converter 8 in order by the switch 7 to perform AD conversion, and the AD converter 8 The output voltage sjk at time tk that has been subjected to AD conversion by the above is supplied to the inner product calculation unit 9. The output voltage sjk at time tk supplied to the inner product calculation unit 9 is

It becomes.
(4) The inner product calculation unit 9 performs addition / subtraction according to each of the L output voltages sjk output from the AD converter 8 and the code sequence dik stored in the RAM 10 (when the code sequence dik = 1). Add and subtract when dik = −1), and update the value of C′ij based on the result.

(5) The time is incremented (tk + 1) and the process returns to (1) until N times of processing corresponding to the length of the code sequence are performed.
When the above processing is completed, the value of C′ij becomes the inner product calculation result.

  The number M of drive lines, the number L of sense lines, and the length N of the code sequence of the sensor panel 2 according to the present embodiment are, for example, M = 16 when applied to a 4-inch class portable information terminal or the like. If L = 32, the pitch is about 3 mm. For example, when applied to an electronic device having a 20-inch class screen, M = 48 and L = 80, so that the pitch is about 6 mm. The degree of freedom of the length N of the code sequence is very high, for example, N = 64 to 512.

(Difference from the prior art of driving concept)
The above-described capacitance detection device described in Patent Document 2 also drives a drive line based on a code sequence, is connected to a sense line, and electrically calculates the sum of currents generated in the capacitances at a plurality of intersections with the driven drive line. A measurement voltage converted into a signal is output, and for each sense line, a product-sum operation is performed using the measurement voltage and a code series to obtain a voltage value corresponding to the capacitance of each intersection. However, the drive concept of the drive line is different from the present embodiment as described below.

For example, to simplify the description, consider an example in which capacitors (C1, C2, C3, C4) are formed between one sense line and four drive lines. If the drive signals (code sequences) of the four drive lines are (1, 1, -1, -1) (in the notation of Patent Document 2, (1, 1, 0, 0)), In the form, all drive lines are always driven,
C1 + C2-C3-C4 (Formula 3)
In the configuration disclosed in Patent Document 2, only the drive line corresponding to “1” is driven,
C1 + C2 (Formula 4)
An integral output corresponding to is obtained. Comparing (Equation 3) of this embodiment and (Equation 4) of Patent Document 2, it can be said that the amount of information included in the integrated output of this embodiment is larger.

Also,
Ci = C + ΔCi
ΔCi: change in capacity (ΔCi is usually about 10% of C)
And
(Formula 3) = C1 + C2-C3-C4
= ΔC1 + ΔC2-ΔC3-ΔC4
≒ 0.2 × C ... (Formula 5)
(Formula 4) = 2 × C + ΔC1 + ΔC2
≈ 2 x C (Formula 6)
It becomes.

  In a touch sensor panel or the like, ΔCi is about 10% of C, so the value of (Expression 6) is about 10 times the value of (Expression 5). That is, the integration circuit that realizes (Equation 6) of Patent Document 2 must set the gain to about 1/10 as compared with the integration circuit of the present embodiment that realizes (Equation 5). The SN ratio is inferior. This difference in the SN ratio is further increased as the number M of drive lines is increased.

  In the present embodiment in which all the drive lines are always driven in parallel, the first drive line (C1, C2) and the second drive line ( This is different from the capacitance detection circuit described in Patent Document 2 that is distributed and driven to C3 and C4). In this embodiment, the offset due to the field-through of the reset switch can be measured by the output of the AD converter in a state where no signal is input to the drive line (a state where the signal is driven by the voltage Vref). Is subtracted in the digital circuit, the offset error can be canceled.

(Difference from prior art of positive and negative operations)
In the present embodiment, M drive lines are driven in parallel so as to be + V volts in the case of +1 and −V volts in the case of −1 in accordance with the value of the code sequence, which corresponds to (Equation 3). The values to be calculated are calculated at once. On the other hand, in the configuration described in Patent Document 2, C1 + C2 of (Equation 4) is calculated, and then an operation corresponding to C3 + C4 is performed. As described above, the configuration described in Patent Document 2 is disadvantageous in increasing the speed while suppressing power consumption because the calculation is performed in two phases.

  In the present embodiment, when the value of the code sequence is −1, the drive line is driven to be −V volts. However, the configuration described in Patent Document 2 only drives the drive line to + V volts. And is different in that there is no concept of driving to -V volts.

(Other configurations of the estimation unit 5)
In the present embodiment, analog integrators 6 respectively corresponding to L sense lines are arranged, these analog integrators 6 are switched by a switch 7, and an AD converter 8 and an inner product operation unit 9 are arranged one by one. Although an example of the configuration is shown, the present invention is not limited to this. One analog integrator 6 may be provided, and reading may be performed for each sense line by switching the input of the analog integrator 6.

  Further, the AD converter 8 may be provided for each sense line and analog integrator, and the switch 7 may be provided between the AD converter 8 and the inner product calculation unit 9.

(Configuration of other embodiment)
In the present embodiment, the example in which the capacitance value of the capacitance formed between the drive line and the sense line is detected has been described, but the present invention is not limited to this. For example, the present invention can be applied to a configuration for estimating the value of a linear element formed between a drive line and a sense line, and M inputs xk (k = 1,... The present invention can also be applied to a configuration that estimates the coefficient Ck corresponding to the kth input xk of the system having M) and linear input / output.

  Moreover, you may comprise the electronic device provided with the touch sensor system 1 described in this Embodiment, and the display panel arrange | positioned on the sensor panel 2 provided in the touch sensor system 1, and also, You may comprise the electronic device provided with the touch sensor system 1 and the display panel which incorporates the sensor panel 2 and has the function of the sensor panel 2. FIG.

(Embodiment 2)
(Driving method of sensor panel by two kinds of voltages)
FIG. 8 is a timing chart for explaining a method of driving a sensor panel provided in the touch sensor system according to the second embodiment.

  In the sensor panel driving method according to the first embodiment described above with reference to FIG. 4, the sensor panel is driven by three kinds of voltages Vref, (Vref + V), and (Vref−V). In this driving method, driving is performed by two kinds of voltages V1 and V2.

  That is, when the code sequence is +1, the drive line is driven by the voltage V1 when the analog integrator 6 (FIG. 1) is reset, and by the voltage V2 when sampling the output from the sense line to which each capacitance is coupled. When the code sequence is −1, the drive line is driven by the voltage V1 when the analog integrator 6 is reset, and by the voltage V1 when sampling the output from the sense line to which each capacitance is coupled.

  Specifically, in the example shown in FIG. 8, since the drive line DL1 has the corresponding elements d11 = + 1 and d12 = + 1 of the code sequence, the sampling is performed after being driven by the voltage V1 when the analog integrator 6 is reset. Sometimes driven by voltage V2, driven by voltage V1 at the next reset, and then driven by voltage V2 at the next sampling. Since the drive line DL2 has corresponding elements d21 = + 1 and d22 = −1 in the code series, after being driven by the voltage V1 when the analog integrator 6 is reset, it is driven by the voltage V2 at the time of sampling and at the time of the next reset. After being driven by the voltage V2, it is driven by the voltage V1 during the next sampling.

  Since the drive line DL3 has the corresponding elements d31 = −1 and d32 = −1 in the code sequence, it is driven by the voltage V2 when the analog integrator 6 is reset, and is then driven by the voltage V1 at the time of sampling. Sometimes it is driven by voltage V2, and then it is driven by voltage V1 at the next sampling. Since the drive line DL4 has corresponding elements d41 = −1 and d42 = + 1 in the code sequence, it is driven by the voltage V2 when the analog integrator 6 is reset, and is then driven by the voltage V1 at the time of sampling, and at the next reset. After being driven by the voltage V1, it is driven by the voltage V2 at the next sampling. Since the drive line DLM has corresponding elements dM1 = −1 and dM2 = + 1 of the code sequence, it is driven by the voltage V2 when the analog integrator 6 is reset, and then is driven by the voltage V1 at the time of sampling, and at the next reset. After being driven by the voltage V1, it is driven by the voltage V2 at the next sampling.

Here, V1 = Vdd, V2 = Vss
Then the output is
(Cf / Cint) × (V1−V2) = (Cf / Cint) × (Vdd−Vss)
And
In the sensor panel driving method according to the first embodiment described above with reference to FIG.
Vref = (Vdd−Vss) / 2,
If you say
Vdd = Vref + V,
Vss = Vref−V,
Because
V = (Vdd−Vss) / 2
Thus, the output is half that of the example shown in FIG. Therefore, according to the driving method of the second embodiment shown in FIG. 8, it is possible to obtain twice the signal intensity of the driving method of the first embodiment of FIG. 4, and double the charge accumulated in the capacitance. Can be.

(Offset read)
FIG. 9 is another timing chart for explaining a driving method of the sensor panel provided in the touch sensor system according to the second embodiment.

  Before driving the drive lines DL1 to DLM in parallel according to the mode shown in FIG. 4 or FIG. 8, as shown in FIG. 9, the drive lines DL1 to DLM are driven by the constant voltage Vref at the time of resetting and sampling. The signal is not input to the line, and the offset output value is read from the analog integrator 6 (FIGS. 1 and 2). The offset output value read from the analog integrator 6 is AD converted by the ADC 8. Next, the offset output value AD-converted by the ADC 8 is measured by the inner product calculation unit 9, and this offset output value is stored in the RAM 10 for each of the sense lines SL1 to SLL.

(Offset compensation method)
Thereafter, the drive lines DL <b> 1 to DLM are driven in parallel according to the mode shown in FIG. 4 or 8, and the output from the capacitance string is output to the analog integrator 6. The ADC 8 performs AD conversion on the output from the capacitance string output to the analog integrator 6 and supplies it to the inner product calculation unit 9. Next, the inner product calculation unit 9 subtracts the offset output value stored in the RAM 10 from the output from the capacitance string supplied by the ADC 8 for each of the sense lines SL1 to SLL, and is provided in the analog integrator 6. Cancel the offset due to the feedthrough of the reset switch.

  Note that the drive lines DL1 to DLM are driven by the constant voltage Vref at the time of resetting and sampling, the offset output value is read from the analog integrator 6, and the offset output value AD-converted by the ADC 8 is measured by the inner product calculation unit 9. Is repeated a plurality of times, a plurality of offset output values are measured, and the average offset output value in which the noise component contained in the offset is reduced is stored in the RAM 10 by averaging the plurality of offset output values. May be. The number of repetitions is, for example, 16 in the case of 60 Hz, and can be set to 100 in the case of 240 Hz.

(Embodiment 3)
(Analog integrator gain switching)
FIG. 10 is a diagram for explaining a driving method of the sensor panel according to the third embodiment. The same components as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will not be repeated.

  An example in which the sensor panel 2 has four drive lines D11 to DL4 and four sense lines SL1 to SL4, and the code sequence is composed of a fourth-order Hadamard matrix generated by the Sylvester method. To do.

  The analog integrator 6A includes an operational amplifier whose one input is coupled to the reference voltage Vref, an integral capacitance of a capacitor Cint disposed between the output of the operational amplifier and the other input, and a parallel to the integral capacitance. Three other integration capacitors connected to each other, and three switches provided respectively between the three other integration capacitors and the output of the operational amplifier.

  The sum along the column direction of each element of the code sequence composed of the fourth-order Hadamard matrix generated by the Sylvester method is “4” in the first column and “0” in the second to fourth columns. . Therefore, when the drive line is driven by each element of the first column of this code sequence, the value of the output from the capacitance column is significantly larger than when driven by the second to fourth columns. The capacity of the analog integrator 6A may be exceeded, and the analog integrator 6A may be saturated.

  Therefore, when the drive line is driven by a column in which the sum of the elements of the code sequence along the column direction is large enough to saturate the analog integrator 6A, the analog integration is performed so as to prevent the analog integrator 6A from being saturated. The switch provided in the vessel 6A is switched from OFF to ON.

  In the Hadamard matrix generated by the Sylvester method, all the elements in the first column are always +1, and the sum of the elements in the column becomes significantly larger than the sum of the other columns, and the analog integrator 6A may be saturated. By switching the switch provided in the analog integrator 6A from off to on as described above and switching the gain of the analog integrator 6A, saturation of the analog integrator can be prevented.

  As described above, according to the third embodiment, since the gain of the analog integrator is switched according to the absolute value of the sum of the elements along the column direction of the code sequence, saturation of the analog integrator can be prevented. it can.

(Compensation by analog product gain switching inner product calculation unit gain switching)
The inner product calculation unit 9 corresponds to each drive line based on the inner product calculation of the digital value obtained by AD-converting the output from the capacitance string output to the analog integrator 6A whose gain can be switched and the code sequence. The capacitance value of the capacitance string to be estimated is estimated. Here, the inner product calculation unit 9 switches the weighting of the digital value according to the absolute value of the sum of each element along the column direction of the code sequence, and the gain of the analog integrator 6A and the gain by the weighting of the digital value Is constant for each column of the code sequence.

(Embodiment 4)
(Division of inner product calculation by multiple driving)
FIGS. 11A and 11B are diagrams for explaining a code sequence for driving the sensor panel according to the fourth embodiment.

  FIG. 11A shows a code sequence composed of a fourth-order Hadamard matrix generated by the Sylvester method. In this code sequence, as in the code sequence shown in FIG. 10, the sum along the column direction of each element is “4” in the first column and “0” in the second to fourth columns. . Therefore, when the drive line is driven by each element of the first column of this code sequence, the value of the output from the capacitance column is significantly larger than when driven by the second to fourth columns. The capacity of the analog integrator 6A may be exceeded, and the analog integrator 6A may be saturated.

  Therefore, as shown in FIG. 11 (b), (1, 1, 1, 1) in the first column of the code sequence is replaced with a column represented by (1, 1, 0, 0) and (0, 0 1 and 1), the four drive lines are driven four to five times, and the total “4” along the column direction of each element is “2”. ”And“ 2 ”, and the maximum value of the total sum along the column direction is reduced to“ 2 ”from“ 4 ”to prevent saturation of the analog integrator.

In Embodiment 4, an example of a code sequence composed of a fourth-order Hadamard matrix generated by the Sylvester method has been described, but the present invention is not limited to this. The present invention can be applied to code sequences composed of ^2n- order Hadamard matrices other than the fourth order, and to code sequences composed of arbitrary-order Hadamard matrices generated by methods other than the Sylvester method. The present invention can also be applied.

(Embodiment 5)
(Triangular drive method)
FIG. 12 is a diagram for explaining a code sequence for driving the sensor panel according to the fifth embodiment.

The sensor panel according to the fifth embodiment has a 2 ⁿ order (M <) generated by the Sylvester method for each of the capacitance columns formed between the M drive lines and the L sense lines. 2 ⁿ ) M drive lines are driven in parallel based on code sequences of code length N> M, which are constituted by +1 or −1 corresponding to each row of the 2 ⁿ ) Hadamard matrix and are orthogonal to each other. FIG. 12 shows an example of a code sequence of 13 rows × 16 columns corresponding to M (= 13) drive lines based on a 16th-order Hadamard matrix.

  FIG. 13 is a graph showing a method for driving the sensor panel. The horizontal axis indicates the position along the column direction of the N = 16 Hadamard matrix shown in FIG. The vertical axis represents the absolute value of the sum of each element along the column direction of the N = 16 Hadamard matrix.

  In the first column of the N = 16 Hadamard matrix, all the elements are 1, so that the position along the column direction (horizontal axis) and the absolute value of the sum of each element along the column direction (vertical axis) The relationship is represented by a linearly monotonically increasing line L1.

The 9th column of the N = 16 Hadamard matrix (column (2 ^(4-1) +1)) is all 1 from the 1st row to the 8th row, and all from the 9th row to the 16th row. Since −1, the relationship between the position along the column direction (horizontal axis) and the absolute value of the sum of the elements along the column direction (vertical axis) increases linearly and monotonically. It is represented by a line L2 that decreases to form a triangular mountain shape with a base length of 16 and a height of 8.

The fifth column ((2 ^4-1 -2 ^4-2 +1) column) of the N = 16 Hadamard matrix is all 1 from the first row to the fourth row, and the fifth row to the eighth row. All of the above are -1, all of the ninth to twelfth lines are 1, and all of the thirteenth to sixteenth lines are -1. Therefore, the relationship between the position along the column direction (horizontal axis) and the absolute value (vertical axis) of the sum of each element along the column direction is two triangular mountain shapes with a base length of 8 and a height of 4. It is represented by the line L3 to be formed. The 13th column (the (2 ^4-1 +2 ^4-2 +1) column) is also all 1 from the first row to the fourth row, and all -1 from the fifth row to the eighth row, Since the ninth to twelfth rows are all -1 and the thirteenth to sixteenth rows are all 1, it is similarly represented by a line L3 that forms two triangular mountain shapes.

  The third column, the seventh column, the eleventh column, and the fifteenth column are represented by a line L4 that forms four triangular mountain shapes having a base length of 4 and a height of 2. The second column, the fourth column, the sixth column, the eighth column, the tenth column, the twelfth column, the fourteenth column, and the sixteenth column have a triangular mountain shape with a base length of 2 and a height of 8 It is represented by a line L5 that is formed individually.

  Here, it is assumed that the threshold Num is a value at which the analog integrator 6 (FIG. 1) is saturated when the absolute value of the sum of the elements along the column direction of the code sequence exceeds this value. In the example shown in FIGS. 12 and 13, it is assumed that Num = 3. Assume that the drive line number M = 13.

  The second column, the fourth column, the sixth column, the eighth column, the tenth column, the twelfth column, the fourteenth column and the sixteenth column corresponding to the line L5, and the third column corresponding to the line L4, the second column As shown in FIG. 13, the seventh column, the eleventh column, and the fifteenth column do not exceed the threshold value Num = 3. Therefore, even if M = 13 drive lines are driven simultaneously, the analog integrator 6 Is not saturated.

  Since the first column corresponding to the line L1 exceeds the threshold value Num = 3, the drive line DL13 is driven four times by three drive lines in order from the first drive line based on the threshold value Num = 3. When the first column is divided and driven so as to be driven, the analog integrator 6 is not saturated.

  In general, after driving Num from the first drive line to the Num × [M / Num] th by [M / Num] times, the remaining number of remaining (M / Num) is calculated. Drive in parallel. Here, [x] is an integer part of x, and the same applies in the description to be described later.

  The ninth column corresponding to the line L2 exceeds the threshold Num = 3. In the ninth column corresponding to the line L2, first, the second to thirteenth rows of the drive line are driven in parallel by corresponding portions of the code series, and then the first row of the drive line is driven.

In general, the drive line is driven in parallel from the (2 ^n-1 − (M−2 ⁿ⁻¹ )) line = (2 ⁿ −M) line to the M line in the drive line. Num driving from the first line of the line to the (2 ^n-1 − (M−2 ⁿ⁻¹ )) line = (2 ⁿ −M) line [(2 ⁿ⁻¹ − ( M-2 ^n-1 ) -1) line / Num based on the line], and then the remaining ((2 ^n-1- (M-2 ^n-1 ) -1) line / Num) ) Are driven in parallel.

In the example shown in the fifth embodiment, since n = 4 and M = 13, the (2 ^n-1 − (M−2 ⁿ⁻¹ )) line = the 3rd line, but the 3rd to 13th lines. Even in parallel driving up to the row, the sum in the column direction of the code sequence is +1, which is 2 smaller than the threshold Num = 3. Therefore, even if the second to thirteenth rows are driven in parallel, the sum of the code sequences in the column direction is +2, which is still smaller than the threshold Num = 3. For this reason, the (2 ^n-1- (M-2 ^n-1 )) line is the third line, but considering the value of the threshold Num, (2 ^n-1- (M-2 ^n-1 )) ) Row = Select the second row as a row based on the third row, and drive the second to thirteenth rows in parallel.

  The fifth column and the thirteenth column corresponding to the line L3 exceed the threshold Num = 3. In the fifth and thirteenth columns corresponding to the line L3, first, the first to eighth rows of the drive line are simultaneously driven in parallel. Then, the 10th to 13th rows of the drive line are driven. Next, the ninth drive line is driven.

In general, first, the drive line from the first line to the (2 ^n-1 ) line is driven in parallel. Then, the drive line is driven in parallel from the line based on the ((2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 ))) line of the drive line. Next, from the (2 ⁿ⁻¹ +1) th row of the drive line ((((2 ⁿ⁻¹ +2 ⁿ⁻² ) − (M− (2 ⁿ⁻¹ +2 ⁿ⁻² ))) based row) − 1) Drive up to the Num number of rows by [((((2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 ))) based rows))- After (2 ^n-1 +1) / Num] iterations, the remaining rows based on ((((((2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 )))) ))-(2 ^n-1 +1) / Num) is driven in parallel.

In the example shown in the fifth embodiment, since n = 4 and M = 13, the ((2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 ))) line = Although the 11th row, even if the 11th to 13th rows are driven in parallel, the sum of the code sequences in the column direction is +1, which is 2 smaller than the threshold Num = 3. Therefore, even if the 10th to 13th rows are driven in parallel, the sum of the code sequences in the column direction is +2, which is still smaller than the threshold Num = 3. For this reason, the ((2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 ))) line = 11th line, but considering the value of the threshold Num, (( 2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 ))) line = 10th line is selected as a line based on the 11th line, and from the 10th line to the 13th line Are driven in parallel.

Next, a sensor panel driving method when the drive line number M is 12 or less will be described. First, the case of 8 <M ≦ 12 will be described. The driving method of the lines L1 and L2 is the same as the driving method described above. In the case of the line L3, first, the drive line from the first row to the (2 ^n-1 ) th row is driven simultaneously in parallel. The driveline ^{(2 n-1)} +1 row ^{(2 n-1) + Num} × [(M- (2 n-1)) / Num] th to drive Num pieces by up to [(M -(2 ^n-1 )) / Num] iterations, the remaining ((M- (2 ^n-1 )) / Num) remaining numbers are driven in parallel.

  Next, the case of 4 <M ≦ 8 will be described. The driving method of the line L1 is the same as the driving method of the line L1 described above. The driving method of the line L2 is the same as the driving method of the line L1 described above. The driving method of the line L3 is the same as the driving method of the line L2 when the number of drive lines M = 13 described above.

  In the case of M ≦ 4, the driving method of the line L1 is the same as the driving method of the line L1, and the driving method of the lines L2 and L3 is also the same as the driving method of the line L1.

Here, a sensor panel driving method when the threshold value Num = 1 is described. The drive line number M = 13. The driving method of the line L1, the line L2, and the line L3 is the same as the driving method when the threshold value Num = 3 described above. In the case of the line L4, first, the drive line from the first line _{to the} (2 ^n-1 +2 ^n-2 ) line is driven simultaneously in parallel. Then, from the (2 ^n-1 +2 ^n-2 ) + 1th to (2 ^n-1 +2 ^n-2 ) + Num × [(M− (2 ⁿ⁻¹ +2 ⁿ⁻² )) / Num] th of the drive line Is repeated [(M− (2 ⁿ⁻¹ +2 ^{n− 2} )) / Num] times, and then the remaining ((M− (2 ⁿ⁻¹ +2 ⁿ⁻² )) / Num is driven. ) Are driven in parallel.

When the order of the 2 ^{n -th} order (M <2 ⁿ ) Hadamard matrix increases and n> 4, the driving method may be the same as that described above.

Note that even if the relationship between the position along the column direction of the code sequence and the absolute value of the sum of the elements along the column direction is not the relationship shown in FIG. 13, the order of the rows of the code sequence is changed. Thus, the position of the code sequence along the column direction and the absolute value of the sum of the elements along the column direction are 2 ⁿ order (M <2 ⁿ ) generated by the Sylvester method having the relationship shown in FIG. When the Hadamard matrix can be obtained, the above driving method may be implemented by changing the order of the rows of the code sequence.

  In the first to fifth embodiments described above, an example in which drive lines are driven in parallel by orthogonal code sequences has been described, but the present invention is not limited to this. The drive line may be driven by a code sequence based on the M sequence.

(A) of FIG. 14 is a figure for demonstrating the code sequence based on the M series which concerns on embodiment. Code sequence d ₁ = (d ₁₁ , d ₁₂ ,..., D _1N ), d ₂ = (d ₂₁ , d ₂₂ ,..., D _2N ),..., DM = (d _M1 , d _M2 ,. , D _MN ) drive the first to M-th drive lines in parallel and have 1 or −1 elements, respectively, and code sequences d ₁ , d ₂ ,. If dM is a sequence obtained by cyclically shifting an M sequence having a length N (= 2 ⁿ −1), the condition shown in (Equation 8) in FIG. 14 is satisfied.

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 length of one period of the M sequence is 2 ⁿ −1. Examples of the M series of length = 2 ³ −1 = 7 include “1, −1, −1, 1, 1, 1, −1”. As an example of an M sequence of length = 2 ⁴ −1 = 15, “1, -1, −1, −1, 1, 1, 1, 1, −1, 1, −1, 1, 1, − 1, -1 ".

  FIG. 14B is a diagram illustrating a specific example of a code sequence based on the M sequence. The code sequence MCS based on the M sequence is a code sequence of 13 rows × 15 columns. The first line of the code sequence MCS is an M sequence “1, −1, −1, −1, 1, 1, 1, 1, −1, 1, −1, 1, 1, −1 of length = 15. -1 ". The second row of the code sequence MCS is an M sequence obtained by cyclically shifting the M sequence of the first row to the left by one digit, and the third row of the code sequence MCS is cyclically shifted by one digit to the left of the M sequence of the second row. M series. Similarly, the kth row of the code sequence MCS is an M sequence obtained by cyclically shifting the M sequence of the (k−1) th row to the left by one digit (2 ≦ k ≦ 13).

(Embodiment 6)
(Electronic device with touch sensor system)
FIG. 15 is a functional block diagram showing the configuration of the mobile phone 12 equipped with the touch sensor system 1. The mobile phone (electronic device) 12 includes a CPU 15, a RAM 17, a ROM 16, a camera 21, a microphone 18, a speaker 19, an operation key 20, a display panel 13, a display control circuit 14, and a touch sensor system 1. And. Each component is connected to each other by a data bus.

  The CPU 15 controls the operation of the mobile phone 12. The CPU 15 executes a program stored in the ROM 16, for example. The operation key 20 receives an instruction input by the user of the mobile phone 12. The RAM 17 volatilely stores data generated by execution of a program by the CPU 15 or data input via the operation keys 20. The ROM 16 stores data in a nonvolatile manner.

  The ROM 16 is a ROM capable of writing and erasing, such as an EPROM (Erasable Programmable Read-Only Memory) and a flash memory. Although not shown in FIG. 14, the mobile phone 12 may be configured to include an interface (IF) for connecting to another electronic device by wire.

  The camera 21 captures a subject in accordance with the operation of the operation key 20 by the user. The image data of the photographed subject is stored in the RAM 17 or an external memory (for example, a memory card). The microphone 18 receives an input of a user's voice. The mobile phone 12 digitizes the input voice (analog data). Then, the cellular phone 12 sends the digitized voice to a communication partner (for example, another cellular phone). The speaker 19 outputs sound based on, for example, music data stored in the RAM 17.

  The touch sensor system 1 includes a sensor panel 2 and an integrated circuit 3. The CPU 15 controls the operation of the touch sensor system 1. For example, the CPU 15 executes a program stored in the ROM 16. The RAM 17 stores data generated by the execution of the program by the CPU 15 in a volatile manner. The ROM 16 stores data in a nonvolatile manner.

  The display panel 13 displays images stored in the ROM 16 and the RAM 17 by the display control circuit 14. The display panel 13 is superimposed on the sensor panel 2 or contains the sensor panel 2.

(Embodiment 7)
[Configuration of touch panel system]
FIG. 17 is a block diagram illustrating a schematic configuration of the touch panel system according to the present embodiment, which is included in the electronic device.

  The touch panel system 611 includes a sensor panel 601 and a touch panel controller 602. The sensor panel 601 and the touch panel controller 602 are configured to be able to detect that a plurality of locations on the sensor panel 601 are touched simultaneously. As an example of the configuration, a so-called capacitive touch panel can be given.

  The sensor panel 601 is disposed so as to overlap the display panel (as shown in FIG. 15) of the display device. Examples of the display device include a liquid crystal display device, a plasma display, an organic EL display device, and a field emission display. Specific examples of the sensor panel 601 include a touch panel provided in an electronic device that is a portable device (portable device) such as a smartphone, a tablet terminal, or a laptop computer.

  The sensor panel 601 includes a plurality of drive lines provided in the vertical direction (X direction in FIG. 17) and provided in parallel with each other. The sensor panel 601 includes a plurality of sense lines (S0, S1, S2,... Sn-1) provided in the horizontal direction (Y direction in FIG. 17) and in parallel with each other. I have. Furthermore, the sensor panel 601 includes a plurality of capacitances (as shown in FIG. 1) formed at locations where a plurality of drive lines and a plurality of sense lines intersect.

  The touch panel controller 602 is a system configured to be able to perform a touch operation using the sensor panel 601 (instruction to the electronic device according to the touch of the sensor panel 601). In the present specification, the touch panel controller 602 is a component for realizing the touch operation, and means a configuration excluding the sensor panel 601.

  The touch panel controller 602 includes a drive unit 603, an amplification circuit 604, a signal selection unit 605, an A / D (analog-digital) conversion unit 606, a decoding processing unit 607, a touch position detection unit 608, and a touch invalidation unit 609. Yes. The touch panel system 611 is provided with a host computer 610.

  The drive unit 603 supplies a charge to a plurality of capacitances by applying a voltage to the plurality of drive lines and driving the plurality of drive lines as in the first to fifth embodiments.

  The amplifier circuit 604 reads out the linear sum signal of the charges accumulated in the plurality of capacitances for each sense line, and supplies the signal to the signal selection unit 605.

  The signal selection unit 605 selects one of the plurality of linear sum signals read for each sense line and supplies the selected signal to the A / D conversion unit 606.

  The A / D conversion unit 606 converts the linear sum signal selected by the signal selection unit 605 from an analog signal to a digital signal, and supplies the converted signal to the decoding processing unit 607.

  The decoding processing unit 607 decodes the linear sum signal supplied from the A / D conversion unit 606 to obtain a capacitance distribution, and supplies it to the touch position detection unit 608.

  The touch position detection unit 608 detects the touched location of the sensor panel 601 from the capacitance distribution according to the distribution of the X coordinate and the Y coordinate, and supplies the detected location to the touch invalidation unit 609.

  The touch invalidation unit 609 detects whether or not the touched portion of the sensor panel 601 is continuously touched for a predetermined period. Here, the predetermined period is about 1 second to several seconds, for example, 2 seconds is a guide. When the touched portion of the sensor panel 601 is continuously touched for a predetermined period, the touch invalidating unit 609 invalidates the touch operation corresponding to the touch.

  The touch invalidation unit 609 supplies information indicating the location of the touched sensor panel 601 to the host computer 610 when the touch operation is validated. On the other hand, the touch invalidation unit 609 waits without supplying the information to the host computer 610 when invalidating the touch operation.

  That is, the touch invalidation unit 609 has a function of invalidating an instruction to the electronic device including the sensor panel 601 according to the touch when the same location on the sensor panel 601 is continuously touched for a predetermined period. doing.

  The host computer 610 is configured by, for example, a CPU (Central Processing Unit). The host computer 610 controls the electronic device according to the information supplied from the touch invalidation unit 609. As a specific example, the host computer 610 supplies display data corresponding to the information supplied from the touch invalidation unit 609 to a display device provided in the electronic device, and displays an image on the display screen of the display device.

[Example 1 of Touch Invalidation Unit]
FIG. 16 is a graph showing an example in which the touch operation is invalidated by the touch invalidation unit 609 according to the present embodiment.

  In the graph of FIG. 16, the vertical axis indicates the touch detection value, and the horizontal axis indicates the elapsed time.

  In the present embodiment, an example will be described in which an object comes into contact with one specific place on the sensor panel 601.

  When an object comes into contact with the sensor panel 601, the touch detection value corresponding to the capacitance corresponding to the location of contact increases according to the degree of contact (pressure to the sensor panel 601, range of contact, etc.). The touch position detection unit 608 of the touch panel controller 602 determines that a touch is performed on the touched portion when the touch detection value is equal to or greater than the touch reference threshold value Dth or exceeds the touch reference threshold value Dth. It is considered that the touch is continued until the touch detection value is less than the touch reference threshold value Dth or less than or equal to the touch reference threshold value Dth.

  Normally, the touch detection value that increases with the contact exceeds the touch reference threshold Dth as long as the finger touches the sensor panel 601 with a human finger. Therefore, here, the touch position detection unit 608 determines that the touch is being performed when the touch detection value exceeds the touch reference threshold Dth, and the touch is performed if the touch detection value is equal to or less than the touch reference threshold Dth. It shall be judged that it is not.

  In the graph of FIG. 16, the time T1 at the moment when the touch detection value becomes the value D1 exceeding the touch reference threshold value Dth is first determined by the touch position detection unit 608 that the touch is performed (the touch is detected). This moment corresponds to the start time T1 of the touch.

  The touch invalidation unit 609 detects whether the touch continues for a predetermined period. In other words, the touch invalidation unit 609 detects whether or not the period during which the touch detection value exceeds the touch reference threshold value Dth continues for a predetermined period.

  At this time, the touch invalidation unit 609 performs the above detection with reference to the touch time threshold value Tth that is a time corresponding to the predetermined period. The time set as the touch time threshold value Tth indicates a certain period having the time as a width (over the time). In the graph of FIG. 16, a period from the touch start time T1 to time T2, which is a time corresponding to the touch start time T1 after the touch time threshold Tth (predetermined period), corresponds to the time of the touch time threshold Tth. In this case, the touch time threshold value Tth is (time T2−time T1).

  As described above, it is preferable that the touch invalidation unit 609 determines whether or not the touch is continued during the touch time threshold Tth that is a time corresponding to the predetermined period.

  Thereby, it can be determined with a simple configuration whether or not the touched portion has been continuously touched for a predetermined period.

  In other words, the touch invalidation unit 609 detects whether or not the touch duration period TA · TB (period in which the touch detection value continues to exceed the touch reference threshold value Dth) is equal to or longer than the time indicated by the touch time threshold value Tth. .

  When the touch duration TA that starts at time T1 and ends at time T3 is equal to or longer than the time indicated by the touch time threshold Tth, the touch invalidation unit 609 determines that the touch has continued for a predetermined period. Based on this determination, the touch invalidation unit 609 invalidates the touch operation corresponding to the touch (see the duration TA in FIG. 16).

  On the other hand, when the touch duration TB that starts at time T4 and ends at time T5 is less than the time indicated by the touch time threshold Tth that starts at time T4 and ends at time T6, the touch invalidation unit 609 It is determined that the touch has not been continued for a predetermined period. Then, based on this determination, the touch invalidation unit 609 validates the touch operation corresponding to the touch (see the duration TB in FIG. 16).

  When the same location on the sensor panel 601 is continuously touched for a predetermined period, the touch invalidation unit 609 invalidates an instruction to the electronic device by this touch. As a result, when an unintended contact of an object with the sensor panel 601 continues, for example, when a hand holding an electronic device contacts the sensor panel 601, an instruction based on the contact is not performed. For this reason, it becomes possible to prevent malfunction caused by unintended contact of an object with the sensor panel 601.

  In addition, unlike the prior art described above, it is not necessary to change the criterion for determining whether or not a touch is performed in order to prevent the above-described malfunction. Therefore, it is possible to suppress a decrease in sensitivity for detecting the presence or absence of touch.

  FIG. 18 is a flowchart illustrating an example in which the touch operation is invalidated by the touch invalidation unit 609 according to the present embodiment.

  First, the touch position detection unit 608 determines whether or not the touch location is touched by determining whether or not the touch detection value corresponding to the touch location exceeds the touch reference threshold Dth (step S <b> 1). F1). When the touch detection value does not exceed the touch reference threshold value Dth (the result of Step F1 is No), the determination is made again.

  When the touch detection value exceeds the touch reference threshold value Dth (the result of step F1 is Yes), the touch invalidation unit 609 determines whether or not the duration of the touch is equal to or longer than the time indicated by the touch time threshold value Tth. Is detected (step F2).

  When the duration of the touch is equal to or longer than the time indicated by the touch time threshold Tth (the result of step F2 is Yes), the touch invalidation unit 609 determines that the touch has continued for a predetermined period, and the touch The touch operation corresponding to is invalidated (step F31).

  On the other hand, when the duration of the touch is less than the time indicated by the touch time threshold value Tth (the result of Step F2 is No), the touch invalidation unit 609 determines that the touch has not continued for a predetermined period. The touch operation corresponding to the touch is validated (step F32).

[Example 2 of the touch invalidation unit]
FIG. 19 is a graph showing another example in which the touch operation is invalidated by the touch invalidation unit 609 according to the present embodiment.

  The graph of FIG. 19 is based on the graph of FIG. In the following, description will be made with reference to the graph of FIG. 19, but only the contents different from the description with reference to the graph of FIG. 16 will be described, and the other description will be omitted for convenience.

  In the example shown in the graph of FIG. 16, the touch reference threshold value Dth, which is a threshold value for determining whether or not a touch is performed based on the touch detection value, is constant regardless of the passage of time.

  On the other hand, the embodiment shown in the graph of FIG. 19 is an example in which the touch invalidation unit 609 changes the touch reference threshold with the passage of time.

  In the example shown in the graph of FIG. 19, the touch invalidation unit 609 is a value where the touch detection value exceeds the touch reference threshold value Dth over the period of the touch time threshold value Tth from the touch start time T1 to the time T2. When D1 is reached, the touch reference threshold is increased from Dth by α. That is, the touch invalidation unit 609 increases the touch reference threshold value by α from the certain period Dth when the touch continues for the touch time threshold value Tth (predetermined period). Here, examples of the certain period include a period until the display device or the electronic device is turned off, or a period shorter than that. The increased touch reference threshold value (Dth + α) is sufficiently larger than at least a touch detection value at which the finger touches the sensor panel 601 with a human finger, and a value at which touching the sensor panel 601 is not determined to be a touch. Is preferable.

  Thereby, after increasing the touch reference threshold by only α from Dth, that is, after the time T2 in FIG. 19, the touch invalidation unit 609 invalidates the touch operation regardless of the duration of the touch. be able to. In this case, even if the touch duration TB that starts at time T4 and ends at time T5 is less than the time indicated by the touch time threshold Tth that starts at time T4 and ends at time T6, the touch invalidation unit 609 The touch operation corresponding to the touch can be invalidated.

  When the duration of the touch is equal to or longer than the time indicated by the touch time threshold Tth, the touch invalidation unit 609 determines that the touch has continued for a predetermined period, invalidates the touch operation according to the touch, and Then, the touch reference threshold value is increased by α from Dth (see period TA in FIG. 19).

  After the touch reference threshold is increased from Dth by α, even if the touch duration TB corresponding to the next touch is less than the time indicated by the touch time threshold Tth, the touch detection value D1 is the touch reference threshold (Dth + α). Since it becomes the following, the touch invalidation part 609 invalidates the touch operation according to said touch (refer period TB in FIG. 19).

  As described above, the touch invalidation unit 609 may be configured to increase the touch reference threshold and invalidate the touch operation corresponding to the touch for a certain period when the touch is continuously performed for a predetermined period.

  As a result, even if an unintended contact of an object with the sensor panel 601 occurs many times in a short period of time, the touch disabling unit 609 can be generated for each contact with only one function. It becomes possible to prevent malfunction.

  In addition, when the same part is continuously touched for a predetermined period, the touch invalidation unit 609 increases the touch reference threshold, thereby invalidating the instruction corresponding to the touch on this part for a certain period of time. This can be realized by the configuration.

[Configuration of electronic equipment]
FIG. 20 is a block diagram showing an example of a schematic configuration of electronic device 100 according to the present embodiment.

  An electronic device 100 illustrated in FIG. 20 is a portable device, and here, a configuration example of a smartphone is illustrated.

  The electronic device 100 includes a bus line 101. The electronic device 100 includes a storage unit 102, a camera unit 103, an input operation unit 104, a communication processing unit 105, a screen display unit 106, an audio output unit 107, and a control unit 108, which are connected to the bus line 101. ing.

  The storage unit 102 includes, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit 102 stores various data such as image data captured by the camera unit 103 and images to be displayed on a display screen which is a main part of the screen display unit 106.

  The camera unit 103 is configured by an imaging module including an imaging lens and an imaging element, for example. The camera unit 103 performs imaging of an object (subject).

  The input operation unit 104 includes a touch panel 109 and an input button group 110.

  The touch panel 109 has the same configuration as the sensor panel 601 (see FIG. 17), and is arranged so as to overlap the display screen. The touch panel 109 can give various instructions to the electronic device 100 according to a touched location, a touch duration, and the like.

  The input button group 110 is a plurality of buttons provided on a housing (not shown) of the electronic device 100. The input button group 110 can give various instructions to the electronic device 100 according to a button to be pressed, a combination of a plurality of buttons to be pressed, a period or timing of pressing the button, and the like.

  The communication processing unit 105 receives the television broadcast, connects to various communication networks such as the Internet, and communicates with other terminals (such as a call in the case of a portable terminal) from the electronic device 100 to the outside of the electronic device 100. Is responsible for communication. The communication processing unit 105 includes various antennas that transmit and receive radio waves and their peripheral circuits (peripheral devices).

  The screen display unit (display device) 106 is one of a liquid crystal display device, a plasma display, an organic EL display device, and a field emission display, and is a display device including a display screen for displaying an image. As described above, the touch panel 109 is disposed so as to overlap the display screen which is a main part of the screen display unit 106, but the detailed structure thereof is not illustrated and described here.

  The audio output unit 107 includes a speaker or the like and outputs sound to the outside.

  The control unit 108 comprehensively controls the storage unit 102, the camera unit 103, the input operation unit 104, the communication processing unit 105, the screen display unit 106, and the audio output unit 107 via the bus line 101. For this control, the control unit 108 writes data to be stored in the storage unit 102 or reads desired data from the storage unit 102 as necessary.

  The control unit 108 is mainly composed of a CPU, and the host computer 610 (see FIG. 17) corresponds to this. However, in consideration of performing signal processing based on an input from the sensor panel 601, each component of the touch panel controller 602 including hardware (see FIG. 17) can be interpreted as being included in the control unit 108.

  Accordingly, it is possible to realize the electronic device 100 that can prevent malfunction caused by unintentional contact of an object with the sensor panel 601 while suppressing a decrease in sensitivity for detecting presence or absence of touch.

[Third embodiment of touch invalidation unit]
The touch invalidation unit 609 functions (when the same part is continuously touched for a predetermined period, the instruction to the electronic device corresponding to the touch is invalidated), the part of the sensor panel 601 It is possible to limit to a region. Such an embodiment will be described with reference to FIGS. 21 (a) and 21 (b).

  FIGS. 21A and 21B are diagrams showing still another example in which the touch operation is invalidated by the touch invalidation unit 609 according to the present embodiment.

  A tablet terminal (electronic device) 200 shown in FIGS. 21A and 21B includes a sensor panel 601, a gravity sensor 201, and a frame 202 arranged so as to overlap the display screen. Although not shown, the tablet terminal 200 includes a touch panel controller 602 (see FIG. 17).

  In the following, in accordance with the contents shown in FIGS. 21A and 21B, the planar shape of the tablet terminal 200 is substantially rectangular, and the gravity sensor 201 is provided in the frame 202 portion constituting the short side thereof. And Further, a state in which the tablet terminal 200 is held so that the short side of the tablet terminal 200 faces the ground (refer to FIG. 21A) is referred to as vertical holding, and the long side of the tablet terminal 200 faces the ground. A state where the tablet terminal 200 is held (see FIG. 21B) is referred to as horizontal holding.

  The gravity sensor 201 detects the orientation of the tablet terminal 200 with respect to gravity (ground). The tablet terminal 200 is configured to be able to control its function, operation, and the like according to the detection result of the orientation of the tablet terminal 200 with respect to gravity by the gravity sensor 201.

  It is well known that electronic devices, not limited to tablet terminals, can be controlled in accordance with the orientation of the electronic device by including a gravity sensor. For example, in the tablet terminal 200, it is possible to perform control such that the orientation of the display image is different depending on whether it is vertically held as shown in FIG. 21A or horizontally held as shown in FIG. .

  As shown in FIG. 21A, when the tablet terminal 200 is held vertically, the hand (object) 203 holding the tablet terminal 200 is generally located at the frame 202 that forms the long side of the tablet terminal 200. Is. And about the part of the sensor panel 601 located near this hand 203, it is thought that there is a high possibility that the hand 203 will contact unintentionally.

  Therefore, when the tablet terminal 200 is held vertically, it is considered that only the vicinity of the portion of the frame 202 constituting the long side of the tablet terminal 200 in the sensor panel 601 is set as an area where the touch invalidation unit 9 functions. . A region 204 in which the touch invalidation unit 9 functions corresponds to the specific example.

  On the other hand, as shown in FIG. 21 (b), when the tablet terminal 200 is held sideways, the hand 203 holding the tablet terminal 200 is generally located at the portion of the frame 202 constituting the short side of the tablet terminal 200. It is. And about the part of the sensor panel 601 located near this hand 203, it is thought that there is a high possibility that the hand 203 will contact unintentionally.

  Therefore, when the tablet terminal 200 is held sideways, it is conceivable that only the vicinity of the portion of the frame 202 constituting the short side of the tablet terminal 200 in the sensor panel 601 is set as an area where the touch invalidation unit 609 functions. . A region 205 where the touch invalidation unit 609 functions corresponds to the specific example.

  In the tablet terminal 200, there is a case where it is desired to realize an instruction to the tablet terminal 200 by touching a specific part of the sensor panel 601 for a long time (so-called long press). And it is not preferable to make the area | region of the sensor panel 601 where it is anticipated that such a long touch will be performed into an area | region where the function of the touch invalidation part 609 is exhibited. Therefore, according to the above configuration, it is easy to simultaneously realize the instruction by touching a specific part of the sensor panel 601 for a long time and the invalidation of the touch by the touch invalidation unit 609.

  Moreover, in the tablet terminal 200, the position suitable as an area | region where the touch invalidation part 609 functions may be changed according to the direction. By detecting the orientation of the tablet terminal 200 with respect to gravity and changing the region according to the detection result, the touch invalidation unit 609 can be caused to function in response to the change in the orientation of the tablet terminal 200. .

  In the above description, an embodiment in which the gravity sensor 201 is provided in the tablet terminal 200 and the region in which the touch invalidation unit 609 functions is changed according to the orientation of the tablet terminal 200 with respect to the gravity detected by the gravity sensor 201 will be described. did. However, the area where the touch invalidation unit 609 functions may be a predetermined fixed area.

  For example, when the tablet terminal 200 is held in advance, an area of the sensor panel 601 that is predicted to have a high possibility of the hand 203 coming into contact with the sensor panel 601 may be an area where the touch invalidation unit 609 functions. Further, the entire portion of the sensor panel 601 located in the vicinity of the frame 202 may be set as an area where the touch invalidation unit 609 functions. By doing so, it is possible to determine a region where the touch invalidation unit 609 functions without performing control according to the detection result by the gravity sensor 201.

  The linear system coefficient estimation method according to the present invention is a system having M inputs Xk (k = 1,..., M) and linear inputs and outputs.

On the other hand, based on M code sequences di = (di1, di2,..., DiN) (i = 1,..., M) orthogonal to length N, the M inputs Xk (k = 1,. , M) and N outputs s = (s1, s2,..., SN) = (F (d11, d21,..., DM1), F (d12, d22,..., DM2),. (D1N, d2N,..., DMN))
An estimation step of estimating a coefficient Ck corresponding to the k-th input Xk based on an inner product operation of the output s and the code sequence di.

  With this feature, the M inputs Xk (k = 1,..., M) based on M code sequences di = (di1, di2,..., DiN) (i = 1,. , M) and N outputs s = (s1, s2,..., SN) = (F (d11, d21,..., DM1), F (d12, d22,..., DM2),. (D1N, d2N,..., DMN)) is output, and all of the M inputs are simultaneously input to estimate the linear system coefficient Ck. Accordingly, unlike the conventional configuration, it is not necessary to select and input M inputs one by one, and even if the number of inputs M increases, the processing time for acquiring the coefficient value of the linear system is short. In addition, it is possible to obtain a linear system coefficient estimation method capable of maintaining high detection accuracy, good resolution, and high-speed operation.

  Another linear system coefficient estimation method according to the present invention includes a first system and a second system having M inputs Xk (k = 1,..., M) and linear inputs and outputs.

.., DiN) (i = 1,..., M), and the M inputs Xk (k = 1). ,..., M) and N outputs from the first system sFirst = (s11, s12,..., S1N) = (F1 (d11, d21,..., DM1), F1 (d12, d22) ,..., DM2),..., F1 (d1N, d2N,..., DMN)) and N outputs from the second system sSecond = (s21, s22,..., S2N) = (F2 (d11, , dM1), F2 (d12, d22,..., dM2),..., F2 (d1N, d2N,..., dMN)), and inner product operation of the output sFirst and the code sequence di The first corresponding to the k1th input Xk An estimation step of estimating a coefficient C2k of the second system corresponding to the k2th input Xk based on an inner product operation of the output sSecond and the code sequence di. It is characterized by that.

  Due to this characteristic, the M inputs xk (k = 1,..., M) based on M code sequences di = (di1, di2,..., DiN) (i = 1,. , M) and N outputs from the first system sFirst = (s11, s12,..., S1N) = (F1 (d11, d21,..., DM1), F1 (d12, d22,. , DM2),..., F1 (d1N, d2N,..., DMN)) and N outputs from the second system sSecond = (s21, s22,..., S2N) = (F2 (d11, d21, .., DM1), F2 (d12, d22,..., DM2),..., F2 (d1N, d2N,..., DMN)) are output simultaneously. Estimate C1k and the second system coefficient C2k. Therefore, unlike the conventional configuration, it is not necessary to select and input M inputs one by one, and the coefficient values of the first and second systems are obtained even when the number of inputs M increases. Thus, it is possible to obtain a linear system coefficient estimation method capable of high-speed operation while maintaining good detection accuracy and good resolution.

  The linear element array value estimation method according to the present invention includes a first linear element array C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M M codes orthogonal to each other in length N for each of the second linear element rows C2i (i = 1,..., M) formed between one drive line and another sense line Based on the series di = (di1, di2,..., DiN) (i = 1,..., M), the M drive lines are driven in parallel, and N pieces from the first linear element array are driven. An output step of outputting an output sFirst = (s11, s12,..., S1N), and N outputs sSecond = (s21, s22,..., S2N) from the second linear element array, and the output sFirst Based on the inner product operation with the code sequence di, the k1 th A value of a linear element of the first linear element array corresponding to the live line is estimated, and the second linear corresponding to the k2nd drive line is calculated based on an inner product operation of the output sSecond and the code sequence di. And an estimation step of estimating a value of a linear element of the element array.

  Due to this feature, the M drive lines are driven in parallel on the basis of M code sequences of length N orthogonal to each other, di = (di1, di2,..., DiN) (i = 1,..., M). N outputs from the first linear element array sFirst = (s11, s12,..., S1N), and N outputs from the second linear element array sSecond = (s21, s22,. , S2N) are output to the M drive lines at the same time, and the values of the linear elements of the first linear element array and the linear elements of the second linear element array are estimated. Therefore, unlike the conventional configuration, it is not necessary to select and drive M drive lines one by one, and the values of the linear elements of the first linear element array and the linear elements of the second linear element array are eliminated. It is possible to obtain a linear system coefficient estimation method that requires a long processing time for acquiring a value, maintains a good detection accuracy, has a good resolution, and can operate at high speed.

  The capacitance detection method according to the present invention includes a first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M Each element is configured by +1 or −1 for each of the second capacitance columns C2i (i = 1,..., M) formed between one drive line and another sense line. Based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, the code sequence is + V volts when the code sequence is +1, In this case, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = (s11, s12,..., S1N) from the first capacitance string, and the first SSecond = (s21, s22,... s2N) is output, and based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the output an estimation step of estimating a capacitance value of the second capacitance string corresponding to the k2nd drive line based on an inner product operation of sSecond and the code sequence di.

  With this feature, the code sequence based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. When the value of +1 is + V volts, and in the case of −1, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = ( s11, s12,..., s1N), and the output sSecond = (s21, s22,..., s2N) from the second capacitance row, so that all are input to the M drive lines simultaneously, A capacitance value of the first capacitance string corresponding to the k1th drive line and a capacitance value of the second capacitance string corresponding to the k2th drive line are estimated. Therefore, unlike the conventional configuration, it is not necessary to select and scan and input M drive lines one by one, and the capacitance value of the first capacitance column corresponding to the k1th drive line and k2 The processing time for acquiring the capacitance value of the second capacitance row corresponding to the second drive line is lengthened, the detection accuracy is kept good, the resolution is good, and the high-speed operation is possible. A capacitance detection method can be obtained.

  In addition, since all M drive lines are driven in parallel at + V volts or −V volts according to the code sequence, the drive line is divided and driven according to the code sequence. As a result, the amount of information included in the output signal from the capacitance string increases, and the SN ratio also improves. Furthermore, compared with the configuration described in Patent Document 2 that performs a two-phase operation, the calculation is further completed, which is advantageous for speeding up.

  The integrated circuit according to the present invention includes a first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M drives. A length in which each element is constituted by +1 or −1 for each of the second capacitance columns C2i (i = 1,..., M) formed between the line and one other sense line N orthogonal code sequences di = (di1, di2,..., DiN) (i = 1,..., M), + V volts when the code sequence is +1, and − when the code sequence is −1. The M drive lines are driven in parallel so as to apply V volts, and the output from the first capacitance string sFirst = (s11, s12,..., S1N), and the second static Output from the capacitance string sSecond = (s21, s22,..., S2N) Based on the driving unit to output, and the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the output sSecond and the output And an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on an inner product calculation with the code sequence di.

  With this feature, the code sequence based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. When the value of +1 is + V volts, and in the case of −1, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = ( s11, s12,..., s1N) and the output sSecond = (s21, s22,..., s2N) from the second capacitance string are output simultaneously, so that all the M drive lines are input simultaneously. A capacitance value of the first capacitance string corresponding to the k1th drive line and a capacitance value of the second capacitance string corresponding to the k2th drive line are estimated. Therefore, unlike the conventional configuration, it is not necessary to select and scan and input M drive lines one by one, and the capacitance value of the first capacitance column corresponding to the k1th drive line and k2 The processing time for estimating the capacitance value of the second capacitance row corresponding to the second drive line is lengthened, the detection accuracy is kept good, the resolution is good, and the high-speed operation is possible. An integrated circuit used for the capacitance detection method can be obtained.

  In addition, since all M drive lines are driven in parallel at + V volts or −V volts according to the code sequence, the drive line is divided and driven according to the code sequence. As a result, the amount of information included in the output signal from the capacitance string increases, and the SN ratio also improves. Furthermore, compared with the configuration described in Patent Document 2 that performs a two-phase operation, the calculation is further completed, which is advantageous for speeding up.

  The touch sensor system according to the present invention includes a first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, A sensor panel including a second capacitance column C2i (i = 1,..., M) formed between the drive line and another sense line; and an integrated circuit for controlling the sensor panel. The integrated circuit includes the first capacitance column C1i (i = 1,..., M) and the second capacitance column C2i (i = 1,...). For each of M), based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, each element consisting of +1 or -1. , If the code sequence is +1, + V volts, if it is -1, -V The M drive lines are driven in parallel so as to apply a fault, and an output sFirst = (s11, s12,..., S1N) from the first capacitance string, and the second electrostatic capacitance Based on the inner product operation of the output sFirst and the code sequence di based on the drive unit that outputs the output sSecond = (s21, s22,..., S2N) from the capacitor string, the first corresponding to the k1st drive line The capacitance value of the second capacitance string corresponding to the k2th drive line is estimated based on the inner product calculation of the output sSecond and the code sequence di. And an estimation unit.

  With this feature, the code sequence based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. When the value of +1 is + V volts, and in the case of −1, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = ( s11, s12,..., s1N) and the output sSecond = (s21, s22,..., s2N) from the second capacitance string are output simultaneously, so that all the M drive lines are input simultaneously. A capacitance value of the first capacitance string corresponding to the k1th drive line and a capacitance value of the second capacitance string corresponding to the k2th drive line are estimated. Therefore, unlike the conventional configuration, it is not necessary to select and scan and input M drive lines one by one, and the capacitance value of the first capacitance column corresponding to the k1th drive line and k2 The processing time for estimating the capacitance value of the second capacitance row corresponding to the second drive line becomes longer, and the touch with high detection speed and good resolution while maintaining good detection accuracy. A sensor system can be obtained.

  In addition, since all M drive lines are driven in parallel at + V volts or −V volts according to the code sequence, the drive line is divided and driven according to the code sequence. As a result, the amount of information included in the output signal from the capacitance string increases, and the SN ratio also improves. Furthermore, compared with the configuration described in Patent Document 2 that performs a two-phase operation, the calculation is further completed, which is advantageous for speeding up.

  An electronic apparatus according to the present invention includes the touch sensor system according to the present invention, and a display panel that is disposed so as to overlap with a sensor panel provided in the touch sensor system or that includes the sensor panel. It is characterized by.

  With this feature, the code sequence based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. When the value of +1 is + V volts, and in the case of −1, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = ( s11, s12,..., s1N) and the output sSecond = (s21, s22,..., s2N) from the second capacitance string are output simultaneously, so that all the M drive lines are input simultaneously. A capacitance value of the first capacitance string corresponding to the k1th drive line and a capacitance value of the second capacitance string corresponding to the k2th drive line are estimated. Therefore, unlike the conventional configuration, it is not necessary to select and scan and input M drive lines one by one, and the capacitance value of the first capacitance column corresponding to the k1th drive line and k2 The processing time for estimating the capacitance value of the second capacitance row corresponding to the second drive line becomes longer, and the touch with high detection speed and good resolution while maintaining good detection accuracy. An electronic device including a sensor system can be obtained.

  In addition, since all M drive lines are driven in parallel at + V volts or −V volts according to the code sequence, the drive line is divided and driven according to the code sequence. As a result, the amount of information included in the output signal from the capacitance string increases, and the SN ratio also improves. Furthermore, compared with the configuration described in Patent Document 2 that performs a two-phase operation, the calculation is further completed, which is advantageous for speeding up.

  The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M Each element is configured by +1 or −1 for each of the second capacitance columns Ci2 (i = 1,..., M) formed between one drive line and one other sense line. The M drive lines are driven in parallel based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. SFirst = (s11, s12,..., S1N) and the output sSecond = (s21, s22,... S2N) from the second capacitance string are output to the analog integrator. Output step, the output sFirst and the code sequence di The capacitance value of the first capacitance string corresponding to the k1th drive line is estimated based on the inner product calculation of the k1th drive line, and the k2nd drive based on the inner product calculation of the output sSecond and the code sequence di An estimation step of estimating a capacitance value of the second capacitance row corresponding to the line, wherein the output step is expressed by Vref volts when the analog integrator is reset. When the M drive lines are driven by the first voltage and the output from the first and second capacitance columns is sampled, if the code sequence is +1, the Vth is represented by (Vref + V) volts. When the code sequence is −1 by two voltages, the M drive lines are driven by a third voltage expressed by (Vref−V) volts.

  With the above feature, the drive lines can be driven in parallel with a simple configuration based on the code sequence.

  The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M Each element is configured by +1 or −1 for each of the second capacitance columns Ci2 (i = 1,..., M) formed between one drive line and one other sense line. The M drive lines are driven in parallel based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. SFirst = (s11, s12,..., S1N) and the output sSecond = (s21, s22,... S2N) from the second capacitance string are output to the analog integrator. Output step, the output sFirst and the code sequence di The capacitance value of the first capacitance string corresponding to the k1th drive line is estimated based on the inner product calculation of the k1th drive line, and the k2nd drive based on the inner product calculation of the output sSecond and the code sequence di An estimation step of estimating a capacitance value of the second capacitance string corresponding to a line, wherein the output step includes the analog step when the code sequence is +1. When the integrator is reset, the drive line is driven by the first voltage when the output from the first and second capacitance strings is sampled, and when the code sequence is −1, The drive line is driven by the second voltage when the integrator is reset, and by the first voltage when the output from the first and second capacitance strings is sampled. That.

  With the above characteristics, higher signal intensity can be obtained, and the charge accumulated in the capacitance can be increased.

  The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M Each element is configured by +1 or −1 for each of the second capacitance columns Ci2 (i = 1,..., M) formed between one drive line and one other sense line. The M drive lines are driven in parallel based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. SFirst = (s11, s12,..., S1N) and the output sSecond = (s21, s22,... S2N) from the second capacitance string are output to the analog integrator. Output step, the output sFirst and the code sequence di The capacitance value of the first capacitance string corresponding to the k1th drive line is estimated based on the inner product calculation of the k1th drive line, and the k2nd drive based on the inner product calculation of the output sSecond and the code sequence di An estimation step of estimating a capacitance value of the second capacitance row corresponding to a line, before the output step, when the analog integrator is reset, and Driving the drive line with a first voltage when sampling the output from the first and second capacitance strings, and outputting the outputs from the first and second capacitance strings to the analog integrator; The outputs from the first and second capacitance arrays are read from the analog integrator as offset outputs and stored in a memory.

  With the above feature, the offset caused by the analog integrator can be canceled.

  The integrated circuit according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M drives. For each of the second capacitance columns Ci2 (i = 1,..., M) formed between the line and one other sense line, each element is constituted by +1 or −1 .., DiN) (i = 1,..., M), the M drive lines are driven in parallel, and the first electrostatic A drive unit that outputs the output sFirst = (s11, s12,..., S1N) from the capacitance string and the output sSecond = (s21, s22,... S2N) from the second capacitance string to the analog integrator. And the inner product of the output sFirst and the code sequence di Is used to estimate the capacitance value of the first capacitance string corresponding to the k1st drive line, and corresponds to the k2th drive line based on the inner product calculation of the output sSecond and the code sequence di. And an estimation unit that estimates a capacitance value of the second capacitance string, wherein the driving unit is configured to reset the analog integrator when the code sequence is +1. When the output from the first and second capacitance strings is sampled by one voltage, the drive line is driven by a second voltage. When the code sequence is −1, the analog integrator is reset when the analog integrator is reset. The drive line is driven by the first voltage when sampling the output from the first and second capacitance arrays by the second voltage.

  With the above characteristics, higher signal intensity can be obtained, and the charge accumulated in the capacitance can be increased.

  The integrated circuit according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M drives. For each of the second capacitance columns Ci2 (i = 1,..., M) formed between the line and one other sense line, each element is constituted by +1 or −1 .., DiN) (i = 1,..., M), the M drive lines are driven in parallel, and the first electrostatic A drive unit that outputs the output sFirst = (s11, s12,..., S1N) from the capacitance string and the output sSecond = (s21, s22,... S2N) from the second capacitance string to the analog integrator. And the inner product of the output sFirst and the code sequence di Is used to estimate the capacitance value of the first capacitance string corresponding to the k1st drive line, and corresponds to the k2th drive line based on the inner product calculation of the output sSecond and the code sequence di. And an estimation unit that estimates a capacitance value of the second capacitance string, wherein the drive unit outputs outputs from the first and second capacitance strings to the analog integrator. Before driving the drive line with the first voltage when the analog integrator is reset and when the output from the first and second capacitance columns is sampled. The output from the capacitance string is output to the analog integrator, and the outputs from the first and second capacitance strings are read from the analog integrator as offset outputs and stored in the memory. To.

  With the above feature, the offset caused by the analog integrator can be canceled.

  The touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M number of the capacitance lines. A sensor panel including a second capacitance column Ci2 (i = 1,..., M) formed between the drive line and another sense line; and an integrated circuit for controlling the sensor panel. The integrated circuit includes the first capacitance row Ci1 (i = 1,..., M) and the second capacitance row Ci2 (i = 1,...). For each of M), based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, each element consisting of +1 or -1. , Driving the M drive lines in parallel to form the first capacitance row Output sFirst = (s11, s12,..., S1N) and an output sSecond = (s21, s22,..., S2N) from the second capacitance string to an analog integrator; Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di And an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation, and the drive unit is configured such that when the code sequence is +1, Driving the drive line with a first voltage when the analog integrator is reset and with a second voltage when sampling the outputs from the first and second capacitance strings; When the analog integrator is reset, the drive line is driven by the second voltage when the analog integrator is reset and by the first voltage when the outputs from the first and second capacitance columns are sampled. Features.

  With the above characteristics, higher signal intensity can be obtained, and the charge accumulated in the capacitance can be increased.

  The touch sensor system according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M number of the capacitance lines. A sensor panel including a second capacitance column Ci2 (i = 1,..., M) formed between the drive line and another sense line; and an integrated circuit for controlling the sensor panel. The integrated circuit includes the first capacitance row Ci1 (i = 1,..., M) and the second capacitance row Ci2 (i = 1,...). For each of M), based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, each element consisting of +1 or -1. , Driving the M drive lines in parallel to form the first capacitance row Output sFirst = (s11, s12,..., S1N) and an output sSecond = (s21, s22,..., S2N) from the second capacitance string to an analog integrator; Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di And an estimation unit that estimates a capacitance value of the second capacitance row corresponding to the k2nd drive line based on the calculation, and the driving unit includes the first and second capacitances. Before outputting the output from the string to the analog integrator, when the analog integrator is reset and when sampling the output from the first and second capacitance strings, the first voltage causes the The live line is driven, the outputs from the first and second capacitance strings are output to the analog integrator, and the outputs from the first and second capacitance strings are used as the offset output to the analog It is characterized by being read from the integrator and stored in a memory.

  With the above feature, the offset caused by the analog integrator can be canceled.

  An electronic apparatus according to the present invention includes the touch sensor system according to the present invention, and a display panel that is disposed so as to overlap with a sensor panel provided in the touch sensor system or that includes the sensor panel. It is characterized by.

  The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M Each element is configured by +1 or −1 for each of the second capacitance columns Ci2 (i = 1,..., M) formed between one drive line and one other sense line. Based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, the code sequence is + V volts when the code sequence is +1, In this case, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = (s11, s12,..., S1N) from the first capacitance string, and the first SSecond = (s21, s22,... 2N) is output to the analog integrator, and the capacitance value of the first capacitance string corresponding to the k1st drive line is estimated based on the inner product operation of the output sFirst and the code sequence di. And an estimation step of estimating a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the inner product calculation of the output sSecond and the code sequence di. In the method, the output step switches a gain of the analog integrator according to an absolute value of a sum of each element along a column direction of the code sequence in order to prevent saturation of the analog integrator. It is characterized by that.

  With the above feature, saturation of the analog integrator can be avoided.

  The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M Each element is configured by +1 or −1 for each of the second capacitance columns Ci2 (i = 1,..., M) formed between one drive line and one other sense line. Based on the orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N, the code sequence is + V volts when the code sequence is +1, In this case, the M drive lines are driven in parallel so as to apply −V volts, and the output sFirst = (s11, s12,..., S1N) from the first capacitance string, and the first SSecond = (s21, s22,... 2N) is output to the analog integrator, and the capacitance value of the first capacitance string corresponding to the k1st drive line is estimated based on the inner product operation of the output sFirst and the code sequence di. And an estimation step of estimating a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the inner product calculation of the output sSecond and the code sequence di. In the method, in the output step, in order to prevent saturation of the analog integrator, a plurality of code sequence columns are converted into a plurality of code sequence columns according to an absolute value of a sum of elements along the code sequence column direction. The driving of the M drive lines is divided into a plurality of times by dividing into rows.

  With the above feature, saturation of the analog integrator can be avoided.

The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between (M = 2 ⁿ ) drive lines and one sense line. , And for each of the second capacitance columns Ci2 (i = 1,..., M) formed between the (M = 2 ⁿ ) drive lines and the other sense line. A code sequence of code length N = M, which is composed of +1 or −1 corresponding to each row of a 2 ^{n -th} order Hadamard matrix generated by the sylvester method and orthogonal to each other, di = (di1, di2, .., DiN) (i = 1,..., M), the M drive lines are applied to apply + V volts when the code sequence is +1 and −V volts when the code sequence is −1. Driving in parallel, the output sF from the first capacitance string rst = (s11, s12,..., s1N) and an output step of outputting an output sSecond = (s21, s22,..., s2N) from the second capacitance string to an analog integrator, and the output sFirst And the code sequence di to estimate the capacitance value of the first capacitance string corresponding to the k1th drive line, and based on the dot product calculation of the output sSecond and the code sequence di And an estimation step of estimating a capacitance value of the second capacitance row corresponding to the k2th drive line, wherein the output step includes saturation of the analog integrator. In order to prevent this, the first column of the code sequence is divided into a plurality of columns, and the drive corresponding to the first column of the code sequence is divided into a plurality of times.

  With the above feature, saturation of the analog integrator can be avoided.

The capacitance detection method according to the present invention includes a first capacitance column Ci1 (i = 1,..., M) formed between M drive lines and one sense line, and the M Each of the second capacitance columns Ci2 (i = 1,..., M) formed between one drive line and another sense line is generated by a sylvester method. A code sequence di = (di1, di2,..., DiN) composed of +1 or -1 corresponding to each row of a 2 ^nth- order (M <2 ⁿ ) Hadamard matrix and orthogonal to each other. Based on (i = 1,..., M), the M drive lines are driven in parallel so that + V volts is applied when the code sequence is +1 and −V volts is applied when the code sequence is −1. Output sFirst from the first capacitance string (S11, s12,..., S1N) and an output step of outputting an output sSecond = (s21, s22,..., S2N) from the second capacitance string to an analog integrator, and the output sFirst and the Based on the inner product operation with the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and based on the inner product operation between the output sSecond and the code sequence di, a capacitance detection method including an estimation step of estimating a capacitance value of the second capacitance column corresponding to the k2nd drive line, wherein the output step is along a column direction of the code sequence. Further, a column in which the absolute value of the sum of each element exceeds a threshold value Num relating to the saturation of the analog integrator is decomposed into a plurality of columns, and a drive corresponding to a column exceeding the threshold value Num in the code sequence is combined. It is divided into several times.

With the above feature, the saturation of the analog integrator can be avoided in driving with a 2 ^{n -th} order (M <2 ⁿ ) Hadamard matrix.

  In the linear element sequence value estimation method according to the present embodiment, each element of the code sequence di = (di1, di2,..., DiN) (i = 1,..., M) is configured by + V or −V. It is preferable.

  With the above configuration, each drive line can be driven by applying a voltage of + V volts or -V volts.

  In the capacitance detection method according to the present embodiment, it is preferable that the estimation step performs addition / subtraction according to the sign, which is necessary for the inner product, for each parallel drive by the code series.

  With the above configuration, the inner product operation is executed for each parallel drive, so that pipeline processing is possible as compared to the configuration in which the inner product operation is executed every N parallel drives corresponding to the length of the code sequence. The calculation can be performed in a short time, and the memory required for the calculation can be reduced.

  In the capacitance detection method, the output step outputs the output sFirst from the first capacitance string to the first analog integrator and outputs the output sSecond from the second capacitance string to the second. Output to the analog integrator, the estimating step performs AD conversion of the output sFirst output to the first analog integrator by an AD converter, and performs an inner product operation of the output sFirst and the code sequence di, It is preferable that the output sSecond output to the second analog integrator is AD-converted by the AD converter and an inner product operation between the output sSecond and the code sequence di is executed.

  With the above configuration, the analog integrator is arranged in parallel corresponding to each sense line, so that the detection speed for detecting the entire capacitance arranged in a matrix can be improved.

  In the capacitance detection method, the output step outputs the output sFirst from the first capacitance string to the analog integrator, and then outputs the output sSecond from the second capacitance string to the analog integration. In the estimation step, the output sFirst output to the analog integrator is AD-converted by an AD converter, and an inner product operation of the output sFirst and the code sequence di is performed. It is preferable that the output sSecond output is AD-converted by the AD converter to perform an inner product operation between the output sSecond and the code sequence di.

  With the above configuration, since the estimation step can be configured with a single analog integrator, the capacitance can be detected with a simpler configuration.

  In the capacitance detection method, the output step outputs the output sFirst from the first capacitance string to the first analog integrator and outputs the output sSecond from the second capacitance string to the second. Output to the analog integrator, and the estimation step performs AD conversion of the output sFirst output to the first analog integrator by a first AD converter and performs an inner product operation of the output sFirst and the code sequence di, It is preferable that the output sSecond output to the second analog integrator is AD-converted by a second AD converter and an inner product operation between the output sSecond and the code sequence di is performed.

  With the above configuration, the analog integrator and the AD converter are arranged in parallel corresponding to each sense line, so that the detection speed for detecting the entire capacitance arranged in a matrix can be further improved. .

  In the capacitance detection method according to the present embodiment, the estimation step includes subtracting the offset output from the first capacitance string stored in the memory from the output sFirst, the code sequence di, The capacitance value of the first capacitance string corresponding to the k1th drive line is estimated based on the inner product calculation of the first product, and the offset output from the second capacitance string stored in the memory is output as the output It is preferable to estimate the capacitance value of the second capacitance string corresponding to the k2nd drive line based on the inner product calculation of the result obtained by subtracting from sSecond and the code sequence di.

  With the above configuration, the offset caused by the analog integrator can be canceled.

  In the capacitance detection method according to the present embodiment, before the output step, when the analog integrator is reset, and when the output from the first and second capacitance strings is sampled, the first voltage is used. Driving the drive line, outputting the output from the first and second capacitance strings to the analog integrator, and using the output from the first and second capacitance strings as the offset output, the analog It is preferable to average a plurality of offset outputs obtained by repeating the operation of reading from the integrator a plurality of times and store them in the memory.

  With the above configuration, the noise component included in the offset generated by the analog integrator can be reduced and stored in the memory.

  In the capacitance detection method according to the present embodiment, the estimation step corresponds to the k1th drive line based on the inner product operation of the first digital value obtained by AD-converting the output sFirst and the code sequence di. The second capacitance corresponding to the k2nd drive line is estimated based on the inner product calculation of the second digital value obtained by estimating the capacitance value of the first capacitance string and AD converting the output sSecond and the code sequence di. The capacitance value of the first and second digital values is switched in accordance with the absolute value of the sum of each element along the code sequence column direction. Is preferred.

  With the above configuration, the gain from the analog integrator to the inner product calculation unit can be made constant for each drive by the code sequence.

In the capacitance detection method according to the present embodiment, the column in which the absolute value of the sum of the elements along the column direction of the code sequence exceeds the threshold Num related to the saturation of the analog integrator is the 2 ^nth order. Of the first, (2 ^n-1 +1), (2 ^n-1 +2 ^n-2 +1), and (2 ^n-1 -2 ^n-2 +1) columns At least one is preferred.

With the above configuration, saturation of the analog integrator can be avoided by a simple algorithm in driving with a 2 ^{n -th} order (M <2 ⁿ ) Hadamard matrix.

In the capacitance detection method according to the present embodiment, when [x] is an integer part of x and the first column of the 2 ^{n -th} order Hadamard matrix exceeds the threshold Num, the first Num × of drive lines After driving [M / Num] th by Num by [M / Num] times, the remaining number of remaining (M / Num) is driven in parallel, and (2 ⁿ⁻¹ ) of the Hadamard matrix is driven. +1) When the column exceeds the threshold value Num, after driving from the row based on the (2 ^n-1- (M-2 ^n-1 )) row of the drive line to the M row in parallel, Driving from the first row to the row based on the (2 ^n-1- (M-2 ^n-1 ) -1) row by Num units [[2 ^n-1- (M-2 ^n-1 ) -1) Row / Num] based on the row, and then the remaining ((2 ^n-1 − (M-2 ^n-1 ) -1) The remaining number of rows / Num) based on the row is driven in parallel, and the (2 ^n-1 +2 ^n-2 +1) -th column of the Hadamard matrix sets the threshold value Num. In the case of exceeding, first, the drive line from the first line to the (2 ^n-1 ) line is simultaneously driven in parallel, and the drive line ((2 ^n-1 +2 ^n-2 )-(M- (2 ^n-1 +2 ^n-2 ))) Drive from the row to the M-th row in parallel, and then from the (2 ^n-1 +1) -th row of the drive line to ((2 ^n-1 +2 ^{n) −2} ) − (M− (2 ⁿ⁻¹ +2 ⁿ⁻² ))) Num driving up to the row based on the row [(((((2 ⁿ⁻¹ +2 ⁿ⁻² ) − ( Row based on M- (2 ^n-1 +2 ^n-2 )))))-(2 ^n-1 +1) / Num] iterations and then the remaining ((((((2 ⁿ⁻¹ +2 ⁿ⁻² ) − (row based on M− (2 ⁿ⁻¹ +2 ⁿ⁻² ))))) − (2 ⁿ⁻¹ +1) / Num) can be driven in parallel. preferable.

With the above configuration, saturation of the analog integrator can be avoided by a simple algorithm in driving with a 2 ^{n -th} order (M <2 ⁿ ) Hadamard matrix.

In the capacitance detection method according to the present embodiment, by changing the order of the rows, a code sequence composed of a 2 ^{n -th} order (M <2 ⁿ ) Hadamard matrix generated by the Sylvester method is generated, and the code sequence Preferably, the M drive lines are driven in parallel based on the above.

  The linear system coefficient estimation method according to the present invention is based on M code sequences di = (di1, di2,..., DiN) (i = 1,. xk (k = 1,..., M) and N outputs s = (s1, s2,..., sN) = (F (d11, d21,..., dM1), F (d12, d22,...) , DM2),..., F (d1N, d2N,..., DMN)) are output simultaneously, and the coefficients Ck of the linear system are estimated by inputting all the M inputs simultaneously. Accordingly, unlike the conventional configuration, it is not necessary to select and input M inputs one by one, and even if the number of inputs M increases, the processing time for acquiring the coefficient value of the linear system is short. In addition, there is an effect that it is possible to obtain a linear system coefficient estimation method capable of high-speed operation with good resolution while maintaining good detection accuracy.

  In order to solve the above problem, the touch panel system of the present invention invalidates an instruction to an electronic device including the touch panel according to the touch when the same portion of the touch panel is continuously touched for a predetermined period. It is characterized by including a touch invalidation unit.

  According to said structure, a touch invalidation part invalidates the instruction | indication with respect to the electronic device by this touch, when the same location in a touch panel is touched continuously for a predetermined period. Thereby, for example, when an unintended contact of an object with respect to the touch panel continues, such as when a hand holding an electronic device touches the touch panel, an instruction based on the touch is not performed. For this reason, it becomes possible to prevent the malfunctioning resulting from the unintended contact of the object with respect to a touch panel.

  Moreover, according to said structure, in order to prevent said malfunctioning, it is not necessary to change the judgment criteria of whether the touch is performed. Therefore, it is possible to suppress a decrease in sensitivity for detecting the presence or absence of touch.

  The electronic device of the present invention includes the touch panel system of the present invention and a display device corresponding to the touch panel. The touch panel system and the display device detect that a plurality of locations on the touch panel are touched simultaneously. It is characterized by being configured to be able to.

  According to the above configuration, similarly to the touch panel system of the present invention, an electronic device that can prevent malfunction caused by unintended contact of an object with the touch panel while suppressing a decrease in sensitivity for detecting the presence or absence of touch. Equipment can be realized.

  In the touch panel system of the present invention, it is preferable that the touch invalidation unit determines whether or not the touch has continued for a touch time threshold value that is a time corresponding to a predetermined period.

  According to said structure, it can be judged with a simple structure whether the said location was continuously touched for the predetermined period.

  Moreover, it is preferable that the said touch invalidation part of the touch panel system of this invention invalidates the said instruction | indication according to the next touch with respect to the said location, when the said location is touched continuously for a predetermined period.

  According to the above configuration, even when an unintended contact of an object with respect to the touch panel occurs many times in a short period, the touch invalidation unit functions only once and occurs each time the contact is made. It is possible to prevent the obtained malfunction.

  In the touch invalidation unit of the present invention, the level of the signal indicating the degree of contact of the object with the above location is equal to or higher than the touch reference threshold serving as a reference for the level, or exceeds the touch reference threshold. Sometimes, it is determined that a touch is made on the location, and the touch invalidation unit preferably increases the touch reference threshold when the location is continuously touched for a predetermined period.

  According to said structure, it can implement | achieve by a simple structure that the instruction | indication according to the touch with respect to the said location is invalidated for a fixed period.

  Moreover, it is preferable that only the one part area | region in the said touch panel is the said location where the said touch invalidation part functions as the electronic device of this invention.

  According to said structure, only the one part area | region in a touch panel can be made into the area | region where the function of a touch invalidation part is exhibited.

  In the electronic device, there is a case where it is desired to realize an instruction to the electronic device by touching a specific part of the touch panel for a long time (so-called long press). And it is not preferable to make the area | region of the touch panel in which such a long touch is anticipated to be an area | region where the function of a touch invalidation part is exhibited. Therefore, according to the above configuration, it is easy to simultaneously realize the instruction by touching a specific part of the touch panel for a long time and the invalidation of the touch by the touch invalidation unit.

  In particular, in the electronic device of the present invention, it is preferable that the partial area is a region where a hand holding the electronic device is in contact with the touch panel.

  In addition, the electronic device of the present invention includes a gravity sensor that detects the orientation of the electronic device with respect to gravity, and the touch invalidation unit changes the partial area according to a detection result of the gravity sensor. It is preferable to do so.

  In an electronic device, the position that is suitable as the partial area may be changed depending on the orientation. According to the above configuration, by detecting the orientation of the electronic device with respect to gravity and changing the part of the area according to the detection result, the touch invalidation unit is configured to correspond to the change in the orientation of the electronic device. It becomes possible to make it function.

  The electronic apparatus of the present invention is any one of a liquid crystal display device, a plasma display, an organic EL (ElectroLuminescence) display device, and a field emission (FED) display, and includes a display screen that displays an image. It is preferable that the touch panel is arranged so as to overlap the display screen of the display device.

  In the electronic device of the present invention, the touch panel is provided in the vertical direction and in parallel with each other, and is provided in the horizontal direction and in parallel with each other. Preferably, a plurality of sense lines, and a plurality of capacitances formed respectively at the intersections of the plurality of drive lines and the plurality of sense lines are provided.

  In other words, the touch panel according to the present invention is preferably of a so-called capacitance type.

  The electronic device of the present invention is a portable device. Examples of portable devices mentioned here include portable devices such as smartphones, tablet terminals, and notebook computers.

  As described above, the touch panel system of the present invention includes a touch invalidation unit that invalidates an instruction to an electronic device including the touch panel according to the touch when the same portion of the touch panel is continuously touched for a predetermined period. It is the structure equipped with.

  Therefore, there is an effect that it is possible to prevent malfunction caused by unintentional contact of an object with respect to the touch panel while suppressing a decrease in sensitivity for detecting presence or absence of touch on the touch panel.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be applied to a method of estimating or detecting a coefficient, element value, or capacitance of a linear system configured in a matrix, and an integrated circuit, a touch sensor system, and an electronic device that operate according to the method. it can. The present invention can also be applied to a fingerprint detection system.

  The present invention can be used for touch panel systems and electronic devices. Specifically, the display screen has a size of 20 inches or less, and can be used for a portable device such as a smartphone, a tablet terminal, a laptop computer, or a digital camera, and a touch panel system included in the electronic device. it can.

DESCRIPTION OF SYMBOLS 1 Touch sensor system 2 Sensor panel 3 Integrated circuit 4 Drive part 5 Estimation part 6, 6A Analog integrator 7 Switch 8 AD converter 9 Inner product calculation part 10 RAM
11 Application Processing Unit 12 Mobile Phone 13 Display Panel 14 Display Control Circuit 15 CPU
16 ROM
17 RAM
18 Microphone 19 Speaker 20 Operation Key 21 Camera 601 Sensor Panel 602 Touch Panel Controller 605 Signal Selection Unit 609 Touch Invalidation Unit 611 Touch Panel System 100 Electronic Device 106 Screen Display Unit (Display Device)
109 Touch Panel 200 Tablet Terminal (Electronic Device)
201 Gravity sensor 204 Area 205 Area T1 Time T2 Time

Claims (13)

A first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M drive lines and another sense For each of the second capacitance columns C2i (i = 1,..., M) formed between the lines, the orthogonal code sequence di of length N, each element being constituted by +1 or −1. = (Di1, di2,..., DiN) (i = 1,..., M), so that + V volts is applied when the code sequence is +1, and −V volts is applied when the code sequence is −1. M drive lines are driven in parallel, and the output sFirst = (s11, s12,..., S1N) from the first capacitance string and the output sSecond = from the second capacitance string = A drive unit for outputting (s21, s22,..., S2N);
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
A touch panel corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, and a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M drive lines and another sense A touch sensor system including a touch panel including a second capacitance column C2i (i = 1,..., M) formed between lines, and an integrated circuit that controls the touch panel,
The integrated circuit is configured so that each of the first capacitance column C1i (i = 1,..., M) and the second capacitance column C2i (i = 1,. When the code sequence is +1 based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,. Is driven in parallel so that + V volt is applied, and in the case of −1, −V volt is applied, and an output sFirst = (s11, s12,... , S1N), and a drive unit that outputs an output sSecond = (s21, s22,..., S2N) from the second capacitance string;
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, and a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense For each of the second capacitance strings Ci2 (i = 1,..., M) formed between the lines, the orthogonal code sequence di of length N, each element being constituted by +1 or −1. = (Di1, di2,..., DiN) (i = 1,..., M), the M drive lines are driven in parallel, and the output sFirst from the first capacitance string = ( s11, s12,..., s1N) and an output sSecond = (s21, s22,..., s2N) from the second capacitance string,
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di A touch sensor system comprising: an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on a calculation;
When the code sequence is +1, the driving unit uses the first voltage when the analog integrator is reset, and the second voltage when sampling the outputs from the first and second capacitance columns. And when the code series is -1, the second voltage when the analog integrator is reset, and the first voltage when sampling the outputs from the first and second capacitance strings. Drive the driveline,
A touch panel corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, further comprising a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense For each of the second capacitance strings Ci2 (i = 1,..., M) formed between the lines, the orthogonal code sequence di of length N, each element being constituted by +1 or −1. = (Di1, di2,..., DiN) (i = 1,..., M), the M drive lines are driven in parallel, and the output sFirst from the first capacitance string = ( s11, s12,..., s1N) and an output sSecond = (s21, s22,..., s2N) from the second capacitance string,
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di A touch sensor system comprising: an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on a calculation;
The drive unit outputs the output from the first and second capacitance strings before the analog integrator is reset, and when the analog integrator is reset, and from the first and second capacitance strings. When sampling the output, the drive line is driven by a first voltage, and outputs from the first and second capacitance columns are output to the analog integrator, and the first and second capacitance columns are output. The output from is read from the analog integrator as an offset output and stored in a memory,
A touch panel corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, further comprising a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense A touch panel comprising a second capacitance row Ci2 (i = 1,..., M) formed between the lines;
A touch sensor system comprising an integrated circuit for controlling the touch panel,
The integrated circuit is provided for each of the first capacitance row Ci1 (i = 1,..., M) and the second capacitance row Ci2 (i = 1,..., M). Based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N composed of elements of +1 or −1, the M drive lines are arranged in parallel. , SFirst = (s11, s12,..., S1N) from the first capacitance string and sSecond = (s21, s22,..., s2N) to the analog integrator, and
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
When the code sequence is +1, the driving unit uses the first voltage when the analog integrator is reset, and the second voltage when sampling the outputs from the first and second capacitance columns. And when the code series is -1, the second voltage when the analog integrator is reset, and the first voltage when sampling the outputs from the first and second capacitance strings. Drive the driveline,
The integrated circuit, when the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one-time touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel Further comprising
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense A touch panel comprising a second capacitance row Ci2 (i = 1,..., M) formed between the lines;
A touch sensor system comprising an integrated circuit for controlling the touch panel,
The integrated circuit is provided for each of the first capacitance row Ci1 (i = 1,..., M) and the second capacitance row Ci2 (i = 1,..., M). Based on an orthogonal code sequence di = (di1, di2,..., DiN) (i = 1,..., M) of length N composed of elements of +1 or −1, the M drive lines are arranged in parallel. , SFirst = (s11, s12,..., S1N) from the first capacitance string and sSecond = (s21, s22,..., s2N) to the analog integrator, and
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
The drive unit outputs the output from the first and second capacitance strings before the analog integrator is reset, and when the analog integrator is reset, and from the first and second capacitance strings. When sampling the output, the drive line is driven by a first voltage, and outputs from the first and second capacitance columns are output to the analog integrator, and the first and second capacitance columns are output. The output from is read from the analog integrator as an offset output and stored in a memory,
The integrated circuit, when the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one-time touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel Further comprising
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M drive lines and another sense For each of the second capacitance columns C2i (i = 1,..., M) formed between the lines, a code sequence di = (length N) in which each element is constituted by +1 or −1. (di1, di2,..., diN) (i = 1,..., M). Are driven in parallel, the output sFirst = (s11, s12,..., S1N) from the first capacitance string, and the output sSecond = (s21) from the second capacitance string. , S22, ..., s2N),
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
A touch panel corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, and a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column C1i (i = 1,..., M) formed between M drive lines and one sense line, and the M drive lines and another sense A touch panel comprising a second capacitance row C2i (i = 1,..., M) formed between the lines;
A touch sensor system comprising an integrated circuit for controlling the touch panel,
The integrated circuit is configured so that each of the first capacitance column C1i (i = 1,..., M) and the second capacitance column C2i (i = 1,. Based on a code sequence di = (di1, di2,..., DiN) (i = 1,..., M) whose length is composed of +1 or −1, + V when the code sequence is +1 The M drive lines are driven in parallel so as to apply volt, or -V volt in the case of -1, and the output sFirst = (s11, s12, ..., s1N from the first capacitance row ), And a drive unit that outputs an output sSecond = (s21, s22,..., S2N) from the second capacitance row;
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, and a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense For each of the second capacitance strings Ci2 (i = 1,..., M) formed between the lines, a code sequence di = (length N) in which each element is constituted by +1 or −1. (di1, di2,..., diN) (i = 1,..., M), the M drive lines are driven in parallel, and the output sFirst = (s11, s12,..., s1N) and an output sSecond = (s21, s22,..., s2N) from the second capacitance string to an analog integrator;
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di A touch sensor system comprising: an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on a calculation;
When the code sequence is +1, the driving unit uses the first voltage when the analog integrator is reset, and the second voltage when sampling the outputs from the first and second capacitance columns. And when the code series is -1, the second voltage when the analog integrator is reset, and the first voltage when sampling the outputs from the first and second capacitance strings. Drive the driveline,
A touch panel corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, further comprising a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense For each of the second capacitance strings Ci2 (i = 1,..., M) formed between the lines, a code sequence di = (length N) in which each element is constituted by +1 or −1. (di1, di2,..., diN) (i = 1,..., M), the M drive lines are driven in parallel, and the output sFirst = (s11, s12,..., s1N) and an output sSecond = (s21, s22,..., s2N) from the second capacitance string to an analog integrator;
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di A touch sensor system comprising: an estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on a calculation;
The drive unit outputs the output from the first and second capacitance strings before the analog integrator is reset, and when the analog integrator is reset, and from the first and second capacitance strings. When sampling the output, the drive line is driven by a first voltage, and outputs from the first and second capacitance columns are output to the analog integrator, and the first and second capacitance columns are output. The output from is read from the analog integrator as an offset output and stored in a memory,
A touch panel corresponding to the drive line, the sense line, the first capacitance row, and the second capacitance row;
If the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one, further comprising a touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel,
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense A touch panel comprising a second capacitance row Ci2 (i = 1,..., M) formed between the lines;
A touch sensor system comprising an integrated circuit for controlling the touch panel,
The integrated circuit is provided for each of the first capacitance row Ci1 (i = 1,..., M) and the second capacitance row Ci2 (i = 1,..., M). The M drive lines are driven in parallel based on a code sequence di = (di1, di2,..., DiN) (i = 1,. , SFirst = (s11, s12,..., S1N) from the first capacitance string, and sSecond = (s21, s22,... S2N) from the second capacitance string. A drive unit that outputs to an analog integrator;
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
When the code sequence is +1, the driving unit uses the first voltage when the analog integrator is reset, and the second voltage when sampling the outputs from the first and second capacitance columns. And when the code series is -1, the second voltage when the analog integrator is reset, and the first voltage when sampling the outputs from the first and second capacitance strings. Drive the driveline,
The integrated circuit, when the same point in the touch panel is touched one time continuously for a predetermined period, according to the touch of the one-time touch invalidation unit for invalidating an instruction to electronic apparatus having the touch panel Further comprising
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit invalidates the instruction according to the next touch on the location when the location is continuously touched for a predetermined period ,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: A first capacitance column Ci1 (i = 1,..., M) formed between the M drive lines and one sense line, and the M drive lines and another sense A touch panel comprising a second capacitance row Ci2 (i = 1,..., M) formed between the lines;
A touch sensor system comprising an integrated circuit for controlling the touch panel,
The integrated circuit is provided for each of the first capacitance row Ci1 (i = 1,..., M) and the second capacitance row Ci2 (i = 1,..., M). The M drive lines are driven in parallel based on a code sequence di = (di1, di2,..., DiN) (i = 1,. , SFirst = (s11, s12,..., S1N) from the first capacitance string, and sSecond = (s21, s22,... S2N) from the second capacitance string. A drive unit that outputs to an analog integrator;
Based on the inner product calculation of the output sFirst and the code sequence di, the capacitance value of the first capacitance string corresponding to the k1th drive line is estimated, and the inner product of the output sSecond and the code sequence di An estimation unit that estimates a capacitance value of the second capacitance string corresponding to the k2nd drive line based on the calculation;
The drive unit outputs the output from the first and second capacitance strings before the analog integrator is reset, and when the analog integrator is reset, and from the first and second capacitance strings. When sampling the output, the drive line is driven by a first voltage, and outputs from the first and second capacitance columns are output to the analog integrator, and the first and second capacitance columns are output. The output from is read from the analog integrator as an offset output and stored in a memory,
The integrated circuit further includes a touch invalidation unit that invalidates an instruction to the electronic device including the touch panel according to the touch when the same portion of the touch panel is continuously touched for a predetermined period of time.
The touch invalidation unit determines whether or not the touch has continued during a touch time threshold that is a time corresponding to a predetermined period,
The touch invalidation unit, when the point is touched once continuously for a predetermined time period, wherein the invalid instructing in response to the next touch on parts of this one,
When the level of a signal indicating the degree of contact of an object with the location is equal to or higher than a touch reference threshold that is a reference for the level or exceeds the touch reference threshold, Judging that the touch to the point is done,
The touch invalidation unit increases the touch reference threshold when the location is continuously touched for a predetermined period so that the signal level of the touch is equal to or lower than the increased touch reference threshold. A touch sensor system characterized by: The touch sensor system according to any one of claims 1 to 12,
An electronic apparatus comprising: a touch panel provided in the touch sensor system, or a display panel including the touch panel.

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