JP2018147266A - Touch panel controller, touch panel system, and touch position detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to distinguish whether a touch panel is touched with a finger or a rod body and determine, even when the touch panel is strongly touched with the rod body, whether or not a pointer is the rod body.SOLUTION: A touch panel controller (10) includes a peak value detection circuit (135) for detecting a peak value on a touch panel (20), a finger threshold filter (140) for determining based on a finger threshold, a finger peripheral threshold filter (145) for determining based on a finger peripheral threshold, a rod body threshold filter (150) for determining based on a rod body threshold, and a rod body peripheral threshold filter (155) for determining based on a rod body peripheral threshold.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a touch panel controller, a touch panel system, and a touch position detection method.

  In recent years, with an increase in size and definition of a display device, a touch panel that performs input by touching a display screen has been increased in size. In addition, it is required to recognize the touch position of the touch panel with high resolution. For this reason, the number of sensors arranged on the touch panel has increased dramatically. Therefore, a touch panel controller that processes a touch panel signal is required to process a drive signal input to the sensor and a sense signal output from the sensor at high speed.

  In view of this, the touch panel system disclosed in Patent Document 1 collectively drives a drive line and decodes a signal output from the sense line, thereby collectively changing a plurality of capacitances in the touch panel. Get.

  Specifically, the touch panel system acquires a differential signal between adjacent sense lines, thereby removing noise applied in common to each sense line and acquiring only an amount of change in capacitance. To do.

  The touch sensor system disclosed in Patent Document 2 determines whether or not the amount of change in the capacitance of the touch panel is greater than a pen threshold, and then determines whether or not the amount of change is greater than a finger threshold. .

  Specifically, when the change amount is larger than the pen threshold value and smaller than the finger threshold value, the touch sensor system shifts to pen touch determination, and counts points where the change amount is larger than the peripheral threshold value for pen touch determination. Then, the touch sensor system determines whether the indicator is a pen or noise based on the counted result.

  The touch sensor system shifts to finger touch determination when the amount of change is larger than the finger threshold, and counts points where the amount of change is larger than the peripheral threshold for finger touch determination. The touch sensor system determines whether the indicator is a finger or noise based on the counted result.

  The touch panel system disclosed in Patent Document 3 includes a touch panel having a plurality of first signal lines parallel to each other and a plurality of second signal lines parallel to each other intersecting the first signal lines. The touch panel system is driven by applying a first drive signal to the first signal line in the first drive mode, and is driven by applying a second drive signal to the second signal line in the second drive mode. Switch between the mode and the second drive mode.

  The touch panel system shows an in-plane distribution of the amount of change in capacitance formed by the first signal line and the second signal line based on the first sense signal appearing on the second signal line in the first drive mode. A first capacitance signal is generated. The touch panel system has a second in-plane distribution of the amount of change in capacitance formed by the first signal line and the second signal line based on the second sense signal that appears on the first signal line in the second drive mode. Generate a capacitance signal.

JP 2012-150819 A (released on August 9, 2012) JP 2013-250596 A (published December 12, 2013) JP 2013-242832 A (released on December 5, 2013)

  However, in the touch sensor system disclosed in Patent Document 1, when the touch panel is strongly touched with a pen, the finger threshold may be exceeded. In this case, the indicator is not determined to be a pen, but is determined to be a finger or noise. Therefore, the touch sensor system has a problem that an erroneous determination is made when the touch panel is strongly touched with a pen.

  In addition, the touch panel systems disclosed in Patent Document 2 and Patent Document 3 do not have a function of distinguishing whether the indicator is a finger or a pen. For this reason, the touch panel system has a problem that it cannot be distinguished whether the touch panel is touched with a finger or a pen.

  One embodiment of the present invention distinguishes whether the touch panel is touched with a finger or a rod-like body, and determines whether the indicator is a rod-like body even when the touch panel is strongly touched with the rod-like body. It aims to make possible.

  In order to solve the above-described problem, a touch panel controller according to an aspect of the present invention includes a peak value detection circuit that detects a peak value on the touch panel of a capacitance signal based on a touch on the touch panel with a finger or a rod-like body; A finger threshold filter that determines whether or not the peak value is a finger peak value candidate based on a finger threshold; and whether or not the finger peak value candidate is a finger peak value based on a touch by the finger A finger peripheral threshold filter that is determined based on a threshold, a bar threshold filter that determines whether the peak value is a bar peak value candidate based on a bar threshold, and the bar peak value candidate is the bar A rod-shaped body periphery threshold filter that determines whether or not the peak value is a rod-shaped body peak value based on a touch by the body based on a rod-shaped body peripheral threshold value, , The finger near threshold filter by the determined finger peak value candidate is not the finger peak value is determined based on whether the a rod member peak value to the rod-shaped body around the threshold.

  The touch position detection method according to one aspect of the present invention includes a peak value detection step of detecting a peak value on the touch panel of a capacitance signal based on a touch on the touch panel with a finger or a rod-like body, and the peak value is A finger threshold value filtering step for determining whether or not a finger peak value candidate is based on a finger threshold value, and whether or not the finger peak value candidate is a finger peak value based on a touch by the finger based on a finger peripheral threshold value A finger peripheral threshold value filtering step for determining, a rod-like body threshold value filtering step for judging whether or not the peak value is a rod-like body peak value candidate based on a rod-like body threshold value, and the rod-like body peak value candidate based on the rod-like body Including a rod-shaped body periphery threshold value filter step for determining whether or not the bar-shaped body peak value is based on a touch based on a rod-shaped body periphery threshold value, Determining serial the determined finger peak value candidate by a finger near a threshold filter processes not the finger peak value based on whether the a rod member peak value to the rod-shaped body around the threshold.

  According to one aspect of the present invention, it is distinguished whether the touch panel is touched with a finger or a rod-like body, and it is determined whether or not the indicator is a rod-like body even when the touch panel is strongly touched with the rod-like body. There is an effect that it can be made possible.

It is the schematic which shows the structure of a touchscreen system provided with the touchscreen controller which concerns on Embodiment 1 of this invention. (A) is the schematic which shows the structure of a touchscreen system, (b) is a circuit diagram which shows a part of structure inside a touchscreen. It is a flowchart which shows the procedure of the process of the said touchscreen controller. It is a graph which shows the value of the amount of change of the electrostatic capacitance of one sense line. (A) is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) is a graph which shows a peak value area | region. It is a schematic diagram which shows typically the value of the variation | change_quantity of the electrostatic capacitance of a peak value area | region. It is a figure which shows distribution of the value of the variation | change_quantity of an electrostatic capacitance in the touch to the touch panel with a finger. (A) is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance. It is a figure which shows distribution of the value of the variation | change_quantity of an electrostatic capacitance in the touch to the touchscreen by a rod-shaped body. (A) is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance. It is a figure which shows distribution of the value of the variation | change_quantity of an electrostatic capacitance in the strong touch to the touchscreen by a rod-shaped body. (A) is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance. It is a figure which shows distribution of the value of the variation | change_quantity of an electrostatic capacitance in the touch to the touch panel by the rod-shaped body with a large contact area to a touch panel. (A) is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance. It is a figure which shows distribution of the value of the variation | change_quantity of an electrostatic capacitance in the touch to the touch panel by hand. (A) is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance. It is the schematic which shows the structure of a touchscreen system provided with the touchscreen controller which concerns on Embodiment 2 of this invention. It is a three-dimensional graph which shows the value of the variation | change_quantity of the electrostatic capacitance on a touch panel. (A) shows the amount of change in capacitance when the second signal line is a drive line, and (b) shows the amount of change in capacitance when the first signal line is a drive line. Indicates the value.

Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9.

  FIG. 1 is a schematic diagram illustrating a configuration of a touch panel system 1 including a touch panel controller 10 according to Embodiment 1 of the present invention. FIG. 1A is a schematic diagram showing the configuration of the touch panel system 1, and FIG. 1B is a circuit diagram showing a part of the internal structure of the touch panel 20.

(Configuration of touch panel system 1)
The touch panel system 1 includes a touch panel controller 10 and a touch panel 20 as illustrated in FIG. The touch panel controller 10 includes a multiplexer 105, a driver 110, a sense amplifier 115, a timing generator 120, an AD converter 125, a capacitance distribution calculation unit 130, a peak value detection circuit 135, a finger threshold filter 140, a finger peripheral threshold filter 145, a bar shape. A body threshold filter 150, a rod-shaped body periphery threshold filter 155, and a touch recognition unit 160 are provided. The touch panel controller 10 determines whether the indicator touching the touch panel 20 is a finger, a rod-like body, or noise. A rod-shaped body is a part in which the part which contacts the touch panel 20 is thinner than a finger. For example, a pen is mentioned as an example of a rod-shaped body.

  The drive readout circuit 100 includes a multiplexer 105, a driver 110, and a sense amplifier 115.

  The multiplexer 105 uses the first signal lines HL1 to HLM extending in the X direction among the signal lines included in the touch panel 20 as one of drive lines and sense lines, and the second signal lines VL1 to VLM extending in the Y direction as drive lines and senses. The other line. Thereafter, the multiplexer 105 switches between the drive line and the sense line. That is, the multiplexer 105 exchanges the connections of the touch panel 20, the driver 110, and the sense amplifier 115. The first signal lines HL <b> 1 to HLM and the second signal lines VL <b> 1 to VLM are signal lines between the touch panel 20 and the connection switching unit 107. The X direction and the Y direction are substantially orthogonal to each other. The first signal lines HL1 to HLM are arranged in parallel to each other, and the second signal lines VL1 to VLM are also arranged in parallel to each other. The multiplexer 105 has a plurality of connection switching units 107.

  There are a plurality of connection switching units 107, and each of the connection switching units 107 switches and controls connection between one first signal line and one second signal line, and the driver 110 and the sense amplifier 115. Specifically, the first signal lines HL1 to HLM are connected to the drive signal lines DL1 to DLM or the sense signal lines SL1 to SLM, respectively. Second signal lines VL1 to VLM are connected to drive signal lines DL1 to DLM or sense signal lines SL1 to SLM, respectively.

  The driver 110 applies voltages to the first signal lines HL1 to HLM or the second signal lines VL1 to VLM through the drive signal lines DL1 to DLM and the connection switching unit 107, based on the code series, and sets each capacitance. Drive.

  The sense amplifier 115 is a voltage corresponding to each capacitance based on signals from the first signal lines HL1 to HLM or the second signal lines VL1 to VLM via the sense signal lines SL1 to SLM and the connection switching unit 107. Compute the linear sum of. The sense amplifier 115 supplies a linear sum (linear sum signal) of voltages corresponding to the respective capacitances driven by the driver 110 to the AD converter 125.

  The timing generator 120 generates a signal that defines the operation of the connection switching unit 107, a signal that defines the operation of the driver 110, a signal that defines the operation of the sense amplifier 115, and a signal that defines the operation of the AD converter 125. The timing generator 120 supplies the generated signals to the connection switching unit 107, the driver 110, the sense amplifier 115, and the AD converter 125, respectively.

  The AD converter 125 AD converts the linear sum of the voltages corresponding to each capacitance supplied from the sense amplifier 115. The AD converter 125 supplies the capacitance distribution calculation unit 130 with the AD-converted linear sum (linear sum signal) of the voltages corresponding to the respective capacitances.

  The capacitance distribution calculation unit 130 calculates a DC map on the touch panel 20 based on the linear sum of the voltages corresponding to each capacitance and the code sequence supplied from the AD converter 125, and the peak value detection circuit 135. To supply. The DC map is a distribution indicating the amount of change (difference value) in the capacitance of the entire touch panel 20 in one frame. Further, in the DC map, after the change amount of each capacitance is calculated based on the linear sum of the voltages corresponding to each capacitance and the code series, no integration is performed in the direction of the sense line. When integration is performed in the direction of the sense line after calculating the amount of change in each capacitance, it may be impossible to detect a touch by a rod-like body if the noise is large. Therefore, the touch panel controller 10 uses a DC map in which integration is not performed in the direction of the sense line after the change amount of each capacitance is calculated.

  The peak value detection circuit 135 detects a peak value on the touch panel 20 of a capacitance signal based on a touch on the touch panel 20 with a finger or a rod-like body based on the DC map supplied from the capacitance distribution calculation unit 130. That is, the peak value detection circuit 135 extracts the peak value coordinates from the DC map calculated by the capacity distribution calculation unit 130.

  The finger threshold filter 140 determines whether or not the peak value is a finger peak value candidate (described later) based on a predetermined finger threshold. The finger threshold is a numerical value in which a minimum value of the change amount of the electrostatic capacitance that is considered to be measured when the touch panel 20 is touched with a finger is set.

  The finger peripheral threshold filter 145 determines whether or not the finger peak value candidate is a finger peak value based on a touch with a finger based on a predetermined finger peripheral threshold.

  The rod-shaped body threshold filter 150 determines whether or not the peak value is a rod-shaped body peak value candidate (described later) based on a predetermined rod-shaped body threshold. The rod-like body threshold is a numerical value in which a minimum value of the change amount of the capacitance that is considered to be measured when the touch panel 20 is touched with a rod-like body is set. Generally, the amount of change in capacitance when touched with a finger is larger than the amount of change in capacitance when touched with a rod-shaped body.

  The rod-shaped body peripheral threshold filter 155 determines whether or not the rod-shaped body peak value candidate is a rod-shaped body peak value based on a touch by the rod-shaped body based on a predetermined rod-shaped body peripheral threshold.

  The touch recognition unit 160 recognizes the touched position on the touch panel 20 based on the determination result supplied from the finger peripheral threshold filter 145 or the rod peripheral threshold filter 155, and detects the finger, the rod, and the noise. Recognize the distinction.

  The touch panel 20 includes first signal lines HL1 to HLM extending in the X direction parallel to each other, and second signal lines VL1 to VLM extending in the Y direction parallel to each other. The touch panel 20 is a capacitive touch panel.

  As shown in FIG. 1B, the first signal lines HL1 to HLM and the second signal lines VL1 to VLM are substantially orthogonal to each other, and the first signal lines HL1 to HLM and the second signal lines VL1 to VLM are A capacitor 210 is connected between the two. That is, the capacitor 210 is connected to a portion where the first signal lines HL1 to HLM and the second signal lines VL1 to VLM intersect.

(Processing procedure of the touch panel controller 10)
Next, a processing procedure (touch position detection method) of the touch panel controller 10 will be described with reference to FIGS. FIG. 2 is a flowchart showing a processing procedure of the touch panel controller 10. FIG. 3 is a graph showing the amount of change in capacitance of one sense line. FIG. 3A is a graph showing the amount of change in capacitance, and FIG. 3B is a graph showing the peak value region. FIG. 4 is a schematic diagram schematically showing the amount of change in capacitance in the peak value region. 3 and 4, the vertical direction indicates the amount of change in capacitance, and the horizontal direction indicates the direction of the sense line in the DC map coordinates. 3 and 4 are two-dimensionally displayed in the DC map with the amount of change in capacitance and the direction of one sense line.

  As shown in FIG. 2, first, the peak value detection circuit 135 is based on the DC map supplied from the capacitance distribution calculation unit 130, and the capacitive signal touch panel 20 is based on a touch on the touch panel 20 with a finger or a rod-like body. The upper peak value is detected (step S110: peak value detection step). Specifically, as shown in FIGS. 3A and 3B, the peak value detection circuit 135 has a peak value region in which the amount of change in capacitance is equal to or greater than a predetermined peak detection threshold. To detect. That is, the peak value detection circuit 135 extracts coordinates that are equal to or greater than the peak detection threshold on the DC map. Also, the largest coordinate value in the region (peak value region) formed by the plurality of extracted coordinates is set as the peak value. At this time, the DC map is set to have a larger value in the order of the finger threshold, the rod-like body threshold, and the peak value detection threshold. A plurality of peak values may be detected. The peak value detection circuit 135 detects a peak value in this peak value region. For example, as shown in FIG. 3B, the peak value detection circuit 135 detects peak value regions X1, X2, and X3 in which the amount of change in capacitance is equal to or greater than the peak detection threshold. The peak value detection circuit 135 detects the peak values P1, P2, and P3 of the peak value regions X1, X2, and X3, respectively. The peak value detection circuit 135 supplies the detected peak value information to the finger threshold filter 140. At this time, the largest value in each of the peak value regions X1, X2, and X3 is the peak value P1, P2, and P3.

  The finger threshold filter 140 determines whether or not the detected peak value is greater than or equal to the finger threshold (step S120: finger threshold filter step). At this time, when there are a plurality of detected peak values, the finger threshold filter 140 selects one peak value and performs determination. For example, as shown in FIG. 3B, when the peak values P1, P2, and P3 are detected, the finger threshold filter 140 first selects and determines the peak value P1. Since the peak value P1 exceeds the finger threshold as shown in FIG. 3B, the finger threshold filter 140 determines that the peak value P1 is a finger peak value candidate (step S130). The finger threshold filter 140 instructs the finger peripheral threshold filter 145 to apply a finger filter (described later) to the peak value region X1 (finger peak value region) including the peak value P1.

  The peak values P2 and P3 are determined after the processing of step S210 is completed for the peak value P1. Note that the peak value P2 does not exceed the finger threshold but exceeds the rod-like body threshold. For this reason, when the finger threshold filter 140 selects the peak value P2, the finger threshold filter 140 determines that the peak value P2 is not a finger peak value candidate. The finger threshold filter 140 instructs the rod-shaped body threshold filter 150 to determine whether or not the peak value P2 is greater than or equal to the rod-shaped body threshold. For the peak value P2, the process proceeds to step S160.

  When the finger threshold filter 140 determines that the peak value P1 is a finger peak value candidate, the finger peripheral threshold filter 145 determines whether the counter is within the finger filter setting (step S140: finger peripheral threshold). Filter process). Specifically, the finger filter means that the finger peripheral threshold filter 145 determines whether or not the finger peak value candidate is a finger peak value based on a finger touch based on the finger peripheral threshold. As shown in FIG. 4, in the peak value region X1, the finger peripheral threshold filter 145 determines whether or not the finger peripheral value is based on the finger touch based on the finger peripheral threshold A1. Generally, in the peak value of the amount of change in capacitance due to touch, the peak value when the indicator is a finger is larger than the peak value when the indicator is a rod-like body. However, when the conductivity of the rod-shaped body is high and the contact resistance between the handle and the rod-shaped body is low, the peak value due to the touch of the rod-shaped body may be equivalent to the peak value due to the finger touch. For this reason, if it judges only by a peak value, there exists a possibility that the touch of a rod-shaped body may be mistakenly judged as a finger touch. Therefore, the finger filter is applied to finally extract the finger touch based on the change state around the peak value of the finger peak value candidate. That is, the finger touch is finally extracted by confirming the width in the direction of the triangular sense line shown in FIG.

  The finger peripheral threshold A1 will be described below. First, on the touch panel 20, the contact coordinates between the touch panel 20 and the indicator are considered. In the coordinates indicating the peak value P1, a first area (excluding the peak value) enlarged from the coordinates to the periphery and a second area (excluding the peak value and the first area) surrounding the first area are set. The finger peripheral threshold filter 145 counts values that are greater than or equal to the finger peripheral threshold A1 in the second region. The finger peripheral threshold A1 is a value lower than the finger threshold. The range centering on the peak value in the first region and the second region is a predetermined range. The ranges of the first area and the second area are recorded as data in a register or the like (not shown), and the ranges can be changed by changing the data. When the finger peripheral threshold filter 145 counts a value that is equal to or greater than the finger peripheral threshold A1, it is determined whether or not the absolute value of the value is equal to or greater than the finger peripheral threshold A1. The reason for determining the absolute value is that the amount of change in capacitance includes a negative value. The finger peripheral threshold filter 145 counts values that are greater than or equal to the finger peripheral threshold A1 in the second region. Here, the set count value of the rod-shaped body filter (described later) is set to 0 to n, and the set count value of the finger filter is set to n + 1 to m (n <m, and n and m are natural numbers). The set count values are recorded as data in a register or the like (not shown), and the set count values can be changed by changing the data.

  If the count number of the value that is greater than or equal to the finger peripheral threshold A1 in the second region is n + 1 or more and m or less (within the set count value of the finger filter), the finger peripheral threshold filter 145 It is determined that the peak value candidate is a finger peak value (step S145). The finger peripheral threshold filter 145 supplies this determination result to the touch recognition unit 160. Based on the determination result, the touch recognition unit 160 determines that the indicator is a finger (touch with a finger).

  In the case of the peak value region Xa shown in FIG. 4, since the peak value Pa exceeds the finger threshold, the finger threshold filter 140 determines that the peak value Pa is a finger peak value candidate. In addition, it is assumed that the count number of values that are greater than or equal to the finger peripheral threshold A1 in the second region is n or less (outside the finger filter set count value). At this time, the finger peripheral threshold filter 145 determines that the finger peak value candidate in the peak value region Xa (finger peak value region) including the peak value Pa is not the finger peak value (step S150). The finger peripheral threshold filter 145 instructs the rod peripheral threshold filter 155 to apply a bar filter (described later) to the finger peak value candidates in the peak value region Xa including the peak value Pa. The subsequent processing is the same as the processing (described later) in steps S180 to S210.

  The touch recognition unit 160 confirms whether or not all the detected peak values have been determined (step S210). When the determination of the peak value P1 is completed and the determination of the peak values P2 and P3 is not completed, the touch recognition unit 160 confirms that the determination of all the detected peak values is not completed. Touch recognition unit 160 instructs finger threshold filter 140 to select whether peak value P2 or peak value P3 is to be determined. When the finger threshold filter 140 selects the peak value P2 or the peak value P3, the processing from step S120 to step S210 is performed again in order.

  When all the determinations of the peak values P1 to P3 are completed, the touch recognition unit 160 confirms that the determination of all the detected peak values has been completed. The touch recognizing unit 160 recognizes any of the finger touch, the rod-like body touch, and the noise at the contact coordinates of the peak values P1 to P3.

  On the other hand, when the finger threshold filter 140 selects the peak value P2, as described above, the finger threshold filter 140 determines whether or not the peak value P2 is equal to or greater than the rod-like body threshold value. To instruct. According to the instruction, the rod-like body threshold filter 150 determines whether or not the peak value P2 is equal to or greater than the rod-like body threshold (step S160: rod-like body threshold filter step).

  Since the peak value P2 exceeds the rod-shaped body threshold, the rod-shaped body threshold filter 150 determines that the peak value P2 is a rod-shaped body peak value candidate (step S170). If the peak value is less than or equal to the rod-like body threshold, the rod-like body threshold filter 150 determines that the peak value is noise or touch (step S200). The rod-shaped body threshold filter 150 instructs the rod-shaped body peripheral threshold filter 155 to apply a rod-shaped body filter (described later) for the peak value P2.

  When it is determined by the rod-like body threshold filter 150 that the peak value P2 is a rod-like body peak value candidate, the rod-like body peripheral threshold filter 155 determines whether or not the counter is within the setting of the rod-like body filter (step S180). : Rod-shaped body periphery threshold filter step). Specifically, the rod-like body filter is a rod-like body peripheral threshold filter 155 that determines whether a rod-like body peak value candidate is a rod-like body peak value based on a touch by a rod-like body based on the rod-like body peripheral threshold. That is. As shown in FIG. 4, in the peak value region X2 (rod-like body peak value region), the rod-like body peripheral threshold filter 155 determines whether or not the rod-like body peak value based on the touch by the rod-like body is the rod-like body peripheral threshold A2. Judgment based on.

  The rod-like body peripheral threshold A2 will be described below. In the coordinates indicating the peak value P2, a first area enlarged from the coordinates to the periphery and a second area surrounding the first area are set. The rod-shaped body peripheral threshold filter 155 counts values that are equal to or greater than the rod-shaped body peripheral threshold A2 in the second region. The rod-shaped body peripheral threshold A2 is a value lower than the rod-shaped body threshold. When the rod-like body periphery threshold filter 155 counts a value that is greater than or equal to the rod-like body periphery threshold A2, it is determined whether or not the absolute value of the value is greater than or equal to the rod-like body periphery threshold A2.

  It is assumed that the count number of values that are equal to or greater than the rod-shaped body peripheral threshold A2 in the second region is n or less (within the set count value of the rod-shaped body filter). At this time, the rod-shaped body peripheral threshold filter 155 determines that the rod-shaped body peak value candidate in the peak value region X2 including the peak value P2 is the rod-shaped body peak value (step S190). The rod-like body peripheral threshold filter 155 supplies this determination result to the touch recognition unit 160. Based on this determination result, the touch recognition unit 160 determines that the indicator is a rod-shaped body (touch by a rod-shaped body).

  In the case of the peak value region X3 shown in FIG. 4, since the peak value P3 is less than the finger threshold, the finger threshold filter 140 determines that the peak value P3 is not a finger peak value candidate. Moreover, since it exceeds the rod-shaped body threshold value, the rod-shaped body threshold value filter 150 determines that the peak value P3 is a rod-shaped body peak value candidate. It is assumed that the count number of the value that is greater than or equal to the rod-shaped body peripheral threshold A2 in the second region is n + 1 or greater (outside the set count value of the rod-shaped body filter). At this time, the rod-shaped body peripheral threshold filter 155 determines that the rod-shaped body peak value candidate in the peak value region X3 (rod-shaped body peak value region) including the peak value P3 is not a rod-shaped body touch, that is, noise or touch. (Step S200). The rod-like body peripheral threshold filter 155 supplies this determination result to the touch recognition unit 160. The touch recognition unit 160 recognizes that the noise or the indicator is touched based on the determination result.

  As described above, since the touch panel controller 10 includes the finger threshold filter 140 and the rod-like body threshold filter 150, it can be distinguished whether the touch panel is touched with a finger or a rod-like body. Further, when the touch panel is strongly touched with a rod-shaped body, the finger peak value candidate is determined not to be the finger peak value by the finger peripheral threshold filter 145. Thereafter, the rod-like body peripheral threshold filter 155 determines whether or not the finger peak value candidate is a rod-like body peak value based on the rod-like body peripheral threshold. Thereby, even when the touch panel controller 10 strongly touches the touch panel with a rod-like body, the touch panel controller 10 can determine whether or not the indicator is a rod-like body.

  Further, the touch panel controller 10 determines the strength of the electrostatic capacity signal in a plurality of peripheral areas surrounding the finger peak value area, and determines the strength of the electrostatic capacity signal in the plurality of peripheral areas surrounding the rod-shaped body peak value area. Thus, by referring to the strength of the capacitance signal in the plurality of peripheral regions surrounding the finger peak value region and the strength of the capacitance signal in the plurality of peripheral regions surrounding the rod-shaped peak value region, the finger, the rod-shaped body , And noise can be distinguished without making an erroneous determination. Further, in the hand-held state such as a palm, the contact area is larger than the case where the indicator is a finger or a rod-like body, and the change range of the capacitance is large, so noise is referred to the change amount of the capacitance in the peripheral region. Can be determined.

(Specific example of indicator determination)
Next, a specific example of the process of determining whether the indicator that has touched the touch panel 20 is a finger, a rod-like body, or noise will be described with reference to FIGS.

  Here, the finger threshold is 650, the rod-like body threshold is 100, the finger-periphery threshold is 60, the rod-like body threshold is 60, the finger filter setting count value is 5 to 10, and the rod-like body filter setting count value is 0 to 4. To do. 5 (a), FIG. 6 (a), FIG. 7 (a), FIG. 8 (a), and FIG. 9 (a), the right direction is the X direction and the lower direction is the Y direction. And In addition, the first region is a region (excluding the peak value) that is expanded to a range in which the peak value is 3 in the X direction, −1 in the X direction, 2 in the Y direction, and −1 in the Y direction. . The second region is a region obtained by removing the peak value and the first region from a region expanded to a range moving to 5 in the X direction, −3 in the X direction, 4 in the Y direction, and −3 in the Y direction. 5 (b), FIG. 6 (b), FIG. 7 (b), FIG. 8 (b), and FIG. 9 (b), the positive peak values PX1, PX3, PX5, PX7, PX9. And negative peak values PX2, PX4, PX6, PX8, and PX10. Here, positive peak values PX1, PX3, PX5, PX7, and PX9 are adopted as the determined peak values, but negative peak values PX2, PX4, PX6, PX8, and PX10 may be employed.

  In addition, when the touch panel 20 is touched with a finger or a rod-like body, the touch panel 20 has a function of transmitting the touched peripheral capacitance to the ground. For this reason, in the touch panel 20, a change in capacitance occurs in a narrow touched range. Further, in general, the rod-shaped body has a thin tip so that a range smaller than the range designated by the finger can be designated, and thus the range in which the capacitance changes is small. For this reason, the set count value of the rod-shaped body filter is set to a value smaller than the set count value of the finger filter. In addition, the first area and the second area are set by extracting a portion where the amount of change in capacitance is large. Since the distribution of the DC map may be different for each type of touch panel, it is desirable that the setting of the first area and the second area be performed again for each type of touch panel.

(When the indicator is a finger)
A case where the indicator is a finger will be described with reference to FIG. FIG. 5 is a diagram illustrating a distribution of capacitance change values when a finger touches the touch panel 20. (A) of FIG. 5 is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) of FIG. 5 is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance.

  As shown in FIG. 5A, the peak value PX1 is 945. Therefore, since the peak value PX1 is a value larger than the finger threshold (650), the finger threshold filter 140 determines that it is a finger peak value candidate. The finger threshold filter 140 instructs the finger peripheral threshold filter 145 to apply the finger filter to the peak value region (finger peak value region) including the peak value PX1.

  The finger peripheral threshold filter 145 counts the number of values whose absolute value is equal to or greater than the finger peripheral threshold value (60) in the coordinates of the second region R2. Among the coordinates of the second region R2, values whose absolute value is equal to or greater than the finger periphery threshold value (60) are −115, 111, −134, 106, −173, and −87. Thereby, since the count value becomes 6, this count value is included in the set count value (5 to 10) of the finger filter. Therefore, it is determined that the indicator is a finger in the peak value region including the peak value PX1.

(When the indicator is a rod-shaped body)
The case where the indicator is a rod-shaped body will be described with reference to FIG. FIG. 6 is a diagram illustrating a distribution of values of capacitance change amounts when a touch panel is touched with a rod-shaped body. 6A is a diagram showing the value of the change amount of the capacitance, and FIG. 6B is a graph showing the value of the change amount of the capacitance.

  As shown in FIG. 6A, the peak value PX3 is 168. Therefore, since the peak value PX3 is smaller than the finger threshold (650), the finger threshold filter 140 determines that the peak value PX3 is not a finger peak value candidate. The finger threshold filter 140 instructs the rod-shaped body threshold filter 150 to determine whether or not the peak value PX3 is equal to or greater than the rod-shaped body threshold. Since the value of the peak value PX3 is 168, the value is larger than the rod-like body threshold (100). Therefore, the peak value PX3 is determined by the rod-shaped body threshold filter 150 as a rod-shaped body peak value candidate. The rod-shaped body threshold filter 150 instructs the rod-shaped body peripheral threshold filter 155 to apply the rod-shaped body filter to the peak value region (bar-shaped body peak value region) including the peak value PX3.

  The rod-shaped body peripheral threshold filter 155 counts the number of values whose absolute value is equal to or greater than the rod-shaped body peripheral threshold (60) in the coordinates of the second region R4. In the coordinates of the second region R4, there is no value whose absolute value is equal to or greater than the rod-like body peripheral threshold (60). Thereby, since the count value becomes 0, this count value is included in the set count value (0 to 4) of the rod filter. Therefore, it is determined that the indicator is a rod-shaped body in the peak value region including the peak value PX3.

(When the indicator is a rod-like body and has strong contact)
A case where the indicator is a rod-like body and is in strong contact will be described with reference to FIG. FIG. 7 is a diagram illustrating a distribution of values of the amount of change in capacitance in a strong touch on the touch panel with a rod-shaped body. (A) of FIG. 7 is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) of FIG. 7 is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance.

  As shown in FIG. 7A, the peak value PX5 is 912. Therefore, since the peak value PX5 is larger than the finger threshold (650), the finger threshold filter 140 determines that it is a finger peak value candidate. The finger threshold filter 140 instructs the finger peripheral threshold filter 145 to apply the finger filter to the peak value region (finger peak value region) including the peak value PX5.

  The finger peripheral threshold filter 145 counts the number of values whose absolute value is equal to or greater than the finger peripheral threshold value (60) in the coordinates of the second region R6. There is no value whose absolute value is greater than or equal to the finger periphery threshold value (60) in the coordinates of the second region R6. Thereby, since the count value becomes 0, this count value is not included in the set count value (5 to 10) of the finger filter. Therefore, it is determined that the indicator is not a finger in the peak value region including the peak value PX5. The finger peripheral threshold filter 145 instructs the bar-shaped peripheral threshold filter 155 to apply the bar-shaped filter in the peak value region including the peak value PX5.

  The rod-shaped body peripheral threshold filter 155 counts the number of values whose absolute value is equal to or greater than the rod-shaped body peripheral threshold (60) in the coordinates of the second region R6. In the coordinates of the second region R6, there is no value whose absolute value is equal to or greater than the rod-like body peripheral threshold (60). Thereby, since the count value becomes 0, this count value is included in the set count value (0 to 4) of the rod filter. Therefore, in the peak value region including the peak value PX5, it is determined that the indicator is a rod-shaped body.

(When the indicator is a rod-shaped body and the contact area is large)
A case where the indicator is a rod-like body and the contact area is large will be described with reference to FIG. FIG. 8 is a diagram illustrating a distribution of values of the amount of change in capacitance when the touch panel is touched by a rod-shaped body having a large contact area with the touch panel. (A) of FIG. 8 is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) of FIG. 8 is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance.

  As shown in FIG. 8A, the value of the peak value PX7 is 321. Therefore, since the peak value PX7 is smaller than the finger threshold (650), the finger threshold filter 140 determines that it is not a finger peak value candidate. The finger threshold filter 140 instructs the rod-shaped body threshold filter 150 to determine whether or not the peak value PX7 is equal to or greater than the rod-shaped body threshold. Since the value of the peak value PX7 is 321, it is a value larger than the rod-like body threshold (100). Therefore, the peak value PX7 is determined by the rod-like body threshold filter 150 to be a rod-like body peak value candidate. The rod-shaped body threshold filter 150 instructs the rod-shaped body peripheral threshold filter 155 to apply the rod-shaped body filter to the peak value region (bar-shaped body peak value region) including the peak value PX7.

  The rod-shaped body peripheral threshold filter 155 counts the number of values whose absolute value is equal to or greater than the rod-shaped body peripheral threshold (60) in the coordinates of the second region R8. Among the coordinates of the second region R8, values whose absolute value is equal to or greater than the rod-shaped body peripheral threshold (60) are −66, 101, −89, and 99. Thereby, since the count value becomes 4, this count value is included in the set count value (0 to 4) of the rod filter. Therefore, it is determined that the indicator is a rod-shaped body in the peak value region including the peak value PX7.

(When the indicator is noise or touched)
A case where the indicator is noise or touched will be described with reference to FIG. FIG. 9 is a diagram illustrating the distribution of the amount of change in capacitance when touching the touch panel by hand. (A) of FIG. 9 is a figure which shows the value of the variation | change_quantity of an electrostatic capacitance, (b) of FIG. 9 is a graph which shows the value of the variation | change_quantity of an electrostatic capacitance.

  As shown in FIG. 9A, the peak value PX9 is 502. Therefore, since the peak value PX9 is smaller than the finger threshold (650), the finger threshold filter 140 determines that the peak value PX9 is not a finger peak value candidate. The finger threshold filter 140 instructs the rod-shaped body threshold filter 150 to determine whether or not the peak value PX9 is equal to or greater than the rod-shaped body threshold. Since the value of the peak value PX9 is 502, the value is larger than the rod-like body threshold (100). Therefore, the peak value PX9 is determined by the rod-shaped body threshold filter 150 to be a rod-shaped body peak value candidate. The rod-shaped body threshold filter 150 instructs the rod-shaped body peripheral threshold filter 155 to apply the rod-shaped body filter to the peak value region (bar-shaped body peak value region) including the peak value PX9.

  The rod-shaped body peripheral threshold filter 155 counts the number of values whose absolute value is equal to or greater than the rod-shaped body peripheral threshold (60) in the coordinates of the second region R10. Among the coordinates of the second region R10, values that are equal to or greater than the rod-shaped body peripheral threshold (60) are -287, -365, 333, 423, -467, -444, 423, 298, 444, 222, 334, 106. , −249, −391, −254, and −354. Thereby, since the count value is 16, this count value is not included in the set count value (0 to 4) of the rod-shaped body filter. Therefore, it is determined that the indicator is noise or touched in the peak value region including the peak value PX9.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 10 is a schematic diagram illustrating a configuration of the touch panel system 2 including the touch panel controller 11 according to the second embodiment of the present invention. FIG. 11 is a three-dimensional graph showing the amount of change in capacitance on the touch panel 20. FIG. 11A shows the amount of change in capacitance when the second signal lines VL1 to VLM are drive lines, and FIG. 11B shows the drive of the first signal lines HL1 to HLM. The value of the amount of change in capacitance when a line is used is shown.

  When the first signal lines HL1 to HLM are drive lines, the second signal lines VL1 to VLM are sense lines, and when the second signal lines VL1 to VLM are drive lines, the first signal line HL1. ~ HLM becomes the sense line. When the first signal lines HL1 to HLM are used as drive lines, the first signal line drive mode is referred to, and when the second signal lines VL1 to VLM are used as drive lines, the second signal line drive mode is referred to. The drive readout circuit 100 has a first signal line drive mode and a second signal line drive mode. In the first signal line drive mode, the first signal lines HL1 to HLM are driven to read the first linear sum signal based on the charge of the capacitor 210 along the second signal lines VL1 to VLM. In the second signal line drive mode, the second signal lines VL1 to VLM are driven and the second linear sum signal based on the charge of the capacitor 210 is read along the first signal lines HL1 to HLM.

(Configuration of touch panel system 2)
As shown in FIG. 10, the touch panel system 2 includes a touch panel controller 11 and a touch panel 20. The touch panel system 2 is different from the touch panel system 1 in that the touch panel controller 10 is changed to the touch panel controller 11.

  The touch panel controller 11 differs from the touch panel controller 10 in that it includes a finger peak value selection circuit 165 and a rod-shaped body peak value adoption circuit 170.

  As shown in FIG. 11A, in the second signal line drive mode, the three-dimensional graph showing the amount of change in capacitance on the touch panel 20 has peak values F1 to F5, PE1, and PE2. It is displayed. Further, as shown in FIG. 11B, in the first signal line drive mode, the three-dimensional graph showing the amount of change in capacitance on the touch panel 20 has peak values F2, F6 to F9, and PE1 is displayed. In both the three-dimensional graph of the first signal line drive mode and the three-dimensional graph of the second signal line drive mode, the peak value F2 and the peak value PE1 are displayed.

  Further, it is assumed that the processing from step S110 to step S210 described above is performed, and the touch recognition unit 160 determines that the peak values F1 to F9 are finger peak values and the peak values PE1 and PE2 are rod-like body peak values. Here, the finger peak value selection circuit 165 finally uses the finger peak value (F2) displayed in both the three-dimensional graph in the first signal line driving mode and the three-dimensional graph in the second signal line driving mode. Select as finger peak value. The rod-shaped body peak value adoption circuit 170 has a rod-shaped body peak value (PE1, PE2) displayed in either the three-dimensional graph of the first signal line driving mode or the three-dimensional graph of the second signal line driving mode. Is finally adopted as the rod-like body peak value. That is, the finger peak value selection circuit 165 selects the peak value F2 as the finger peak value, and the rod-like body peak value adoption circuit 170 adopts the peak values PE1 and PE2 as the rod-like body peak values. The touch recognition unit 160 receives the peak value information from the finger peak value selection circuit 165 and the rod-shaped body peak value adoption circuit 170, recognizes that the indicator is a finger at the peak value F2, and determines the peak values PE1 and PE2 at the peak values PE1 and PE2. The indicator is recognized as a rod-shaped body. At this time, the peak value that does not correspond to either the finger peak value or the rod-like body peak value is recognized by the touch recognition unit 160 as noise or touch on the sense line.

  In summary, the finger peak value selection circuit 165 selects a finger peak value candidate determined as a finger peak value in both the first signal line drive mode and the second signal line drive mode as the finger peak value. The rod-shaped body peak value adoption circuit 170 employs a rod-shaped body peak value candidate determined as a rod-shaped body peak value in either the first signal line drive mode or the second signal line drive mode as the rod-shaped body peak value. .

  As described above, the touch panel controller 11 sets the finger peak value candidates determined by the finger peak value selection circuit 165 to be finger peak values in both the first signal line driving mode and the second signal line driving mode. Choose as. In addition, the touch panel controller 11 uses the rod-like body peak value adoption circuit 170 to select the rod-like body peak value candidates determined to be the rod-like body peak value in either the first signal line driving mode or the second signal line driving mode. Adopted as a rod-like peak value. Thereby, when the touch panel 20 is strongly touched with a stick-shaped body, when it is determined that the finger threshold is exceeded and the finger is not a finger, it is determined that the indicator is a stick-shaped body without being determined to be noise. To do. Therefore, the touch panel controller 11 does not make an erroneous determination when the touch panel 20 is strongly touched with a rod-shaped body. Therefore, the touch panel controller 11 can reliably extract a signal of a touch by a rod-shaped body having a low signal intensity while removing noise.

[Summary]
The touch panel controller (10, 11) according to the first aspect of the present invention includes a peak value detection circuit (135) that detects a peak value on the touch panel of a capacitance signal based on a touch on the touch panel (20) with a finger or a rod-like body. ), A finger threshold filter (140) for determining whether or not the peak value is a finger peak value candidate, and whether or not the finger peak value candidate is a finger peak value based on a touch by the finger A finger peripheral threshold filter (145) for determining whether or not the peak value is a bar peak candidate, and a bar threshold filter (150) for determining whether or not the peak value is a bar peak candidate. And a rod-shaped body peripheral threshold filter that determines whether the rod-shaped body peak value candidate is a rod-shaped body peak value based on a touch by the rod-shaped body based on a rod-shaped body peripheral threshold 155), and the bar periphery threshold filter determines whether or not the finger peak value candidate determined by the finger periphery threshold filter as not being the finger peak value is the bar peak value. Determine based on.

  According to the above configuration, since the touch panel controller includes the finger threshold filter and the rod-like body threshold filter, it can be distinguished whether the touch panel is touched with the finger or the rod-like body. Further, when the touch panel is strongly touched with a stick-shaped body, it is determined that the finger peak value candidate is not the finger peak value by the finger peripheral threshold filter. Thereafter, the bar-shaped peripheral threshold filter determines whether or not the finger peak value candidate is a bar-shaped peak value based on the bar-shaped peripheral threshold. Thereby, even when the touch panel controller strongly touches the touch panel with a stick-shaped body, the touch panel controller can determine whether or not the indicator is a stick-shaped body.

  A touch panel controller (11) according to aspect 2 of the present invention is the touch panel controller (11) according to aspect 1, in which the touch panel (20) includes a plurality of first signal lines (HL1 to HLM) and a plurality of first signal lines intersecting the first signal line. Two signal lines (VL1 to VLM) and a plurality of capacitors (210) formed between the plurality of first signal lines and the plurality of second signal lines, respectively, A first signal line driving mode for driving and reading a first linear sum signal based on the charge of the capacitor along the second signal line; and a second linear based on the charge of the capacitor by driving the second signal line A drive readout circuit (100) having a second signal line drive mode for reading a sum signal along the first signal line is further provided, and the finger peripheral threshold filter (145) is used in the first signal line drive mode. There are a plurality of finger peak value candidates determined to be finger peak values, and there are a plurality of finger peak value candidates determined to be finger peak values by the finger peripheral threshold filter in the second signal line drive mode. In the first signal line driving mode, there are a plurality of rod-like body peak value candidates determined to be the rod-like body peak value by the rod-like body peripheral threshold filter (155), and in the second signal line driving mode, There are a plurality of rod-like body peak value candidates determined to be the rod-like body peak value by the rod-like body peripheral threshold filter, and the finger peak value is obtained in both the first signal line driving mode and the second signal line driving mode. A finger peak value selection circuit (165) for selecting a finger peak value candidate determined to be present as a finger peak value, and any of the first signal line drive mode and the second signal line drive mode The determined rod-like body peak value candidate to be rod-shaped body the peak value may further comprise a rod-like member peak employed circuit employing a rod-shaped body peak value (170) in or.

  According to the above configuration, the touch panel controller selects a finger peak value candidate determined by the finger peak value selection circuit as a finger peak value in both the first signal line drive mode and the second signal line drive mode. Select as finger peak value. In addition, the touch panel controller uses the rod-shaped body peak value adoption circuit to determine the rod-shaped body peak value candidate determined to be the rod-shaped body peak value in either the first signal line drive mode or the second signal line drive mode. Adopted as peak value. Accordingly, when the touch panel is strongly touched with a stick-shaped body, when it is determined that the finger threshold is exceeded and the finger is not a finger, the indicator is determined to be a stick-shaped body without being determined to be noise. . Therefore, the touch panel controller does not make an erroneous determination when the touch panel is strongly touched with a rod-shaped body. Therefore, the touch panel controller can reliably extract the signal of the touch by the rod-shaped body with low signal intensity while removing noise.

  The touch panel controller (10, 11) according to Aspect 3 of the present invention is the touch panel controller (10, 11) according to Aspect 1 or 2, wherein the finger peripheral threshold is electrostatic in a plurality of peripheral regions surrounding a finger peak value region corresponding to the finger peak value candidate. Capacitance in a plurality of peripheral regions provided to determine the intensity of a capacitance signal, the threshold value being smaller than the finger threshold value, wherein the rod-like body peripheral threshold value surrounds the rod-like body peak value region corresponding to the rod-like body peak value candidate It may be provided to determine the intensity of the signal and may be lower than the rod-like body threshold.

  According to the above configuration, the touch panel controller determines the strength of the capacitance signal in the plurality of peripheral regions surrounding the finger peak value region, and the strength of the capacitance signal in the plurality of peripheral regions surrounding the rod-shaped body peak value region. Determine. Thus, by referring to the strength of the capacitance signal in the plurality of peripheral regions surrounding the finger peak value region and the strength of the capacitance signal in the plurality of peripheral regions surrounding the rod-shaped peak value region, the finger, the rod-shaped body , And noise can be distinguished without making an erroneous determination. Further, in the hand-held state such as a palm, the contact area is larger than the case where the indicator is a finger or a rod-like body, and the change range of the capacitance is large, so noise is referred to the change amount of the capacitance in the peripheral region. Can be determined.

  The touch panel system (1, 2) according to aspect 4 of the present invention may include the touch panel controller and the touch panel (20) in any of the above aspects 1 to 3.

  As for the touch panel controller (10, 11) which concerns on aspect 5 of this invention, the site | part which the said rod-shaped body contacts the said touch panel (20) may be thinner than the said finger | toe.

  The touch position detection method according to aspect 6 of the present invention includes a peak value detection step of detecting a peak value on the touch panel of a capacitance signal based on a touch on the touch panel (20) with a finger or a rod-like body, and the peak value A finger threshold value filtering step for determining whether or not the finger peak value candidate is based on a finger threshold value, and whether or not the finger peak value candidate is a finger peak value based on a touch by the finger based on a finger peripheral threshold value A finger periphery threshold value filtering step, a rod-like body threshold value filtering step for judging whether or not the peak value is a rod-like body peak value candidate based on a rod-like body threshold value, and the rod-like body peak value candidate being the rod-like body Including a rod-shaped body periphery threshold value filter step for determining whether or not the bar-shaped body peak value is based on a touch by a rod-shaped body periphery threshold value, Determining the determined finger peak value candidate by a finger near a threshold filter processes not the finger peak value based on whether the a rod member peak value to the rod-shaped body around the threshold.

  According to said structure, since the touch position detection method is provided with the finger threshold value filter process and the rod-shaped body threshold value filter process, it can distinguish whether the touch panel is touched with the finger or the rod-shaped body. Further, when the touch panel is strongly touched with a rod-shaped body, it is determined that the finger peak value candidate is not the finger peak value by the finger peripheral threshold filter process. Thereafter, in the rod-like body periphery threshold filter step, it is determined based on the rod-like body periphery threshold whether or not the finger peak value candidate is a rod-like body peak value. Thereby, the touch position detection method can determine whether or not the indicator is a rod-like body even when the touch panel is strongly touched with the rod-like body.

  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. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

1, 2 Touch Panel System 10, 11 Touch Panel Controller 20 Touch Panel 100 Drive Read Circuit 105 Multiplexer 107 Connection Switching Unit 110 Driver 115 Sense Amplifier 120 Timing Generator 125 AD Converter 130 Capacitance Distribution Calculation Unit 135 Peak Value Detection Circuit 140 Finger Threshold Filter 145 Finger Peripheral threshold filter 150 Bar-shaped body threshold filter 155 Bar-shaped body peripheral threshold filter 160 Touch recognition unit 165 Finger peak value selection circuit 170 Bar-shaped body peak value adoption circuit 210 Capacitor HL1 to HLM First signal line VL1 to VLM Second signal line P1 to P3 , Pa, PX1 to PX10, F1 to F9, PE1, PE2 Peak value X1 to X3, Xa Peak value region A1 Finger peripheral threshold A2 Rod-shaped peripheral threshold R1, R3, R5 , R7, R9 first region R2, R4, R6, R8, R10 second region

Claims (6)

A peak value detection circuit for detecting a peak value on the touch panel of a capacitance signal based on a touch on the touch panel with a finger or a rod; and
A finger threshold filter that determines whether or not the peak value is a finger peak value candidate based on a finger threshold;
A finger peripheral threshold filter that determines whether the finger peak value candidate is a finger peak value based on a touch by the finger based on a finger peripheral threshold;
A rod-shaped body threshold filter that determines whether or not the peak value is a rod-shaped body peak value candidate based on a rod-shaped body threshold;
A rod-shaped body periphery threshold filter that determines whether the rod-shaped body peak value candidate is a rod-shaped body peak value based on a touch by the rod-shaped body, based on a rod-shaped body peripheral threshold;
The rod-shaped body peripheral threshold filter determines whether or not a finger peak value candidate determined not to be the finger peak value by the finger peripheral threshold filter is the rod-shaped body peak value based on the rod-shaped body peripheral threshold. Touch panel controller featuring The touch panel is formed between a plurality of first signal lines, a plurality of second signal lines intersecting with the first signal lines, and the plurality of first signal lines and the plurality of second signal lines, respectively. And having a plurality of capacitors
A first signal line driving mode for driving the first signal line to read a first linear sum signal based on the charge of the capacitor along the second signal line; and driving the second signal line to drive the capacitor A drive readout circuit having a second signal line drive mode for reading out a second linear sum signal based on charge along the first signal line;
There are a plurality of finger peak value candidates determined to be finger peak values by the finger peripheral threshold filter in the first signal line driving mode, and the finger peak value is determined by the finger peripheral threshold filter in the second signal line driving mode. There are multiple finger peak value candidates determined to be
In the first signal line driving mode, there are a plurality of rod-like body peak value candidates determined to be the rod-like body peak value by the rod-like body periphery threshold filter, and in the second signal line driving mode, the rod-like body periphery threshold filter There are a plurality of rod-like body peak value candidates determined to be rod-like body peak values by
A finger peak value selection circuit that selects a finger peak value candidate determined to be a finger peak value in both the first signal line driving mode and the second signal line driving mode;
A rod peak value adoption circuit that employs, as a rod peak value, a rod peak candidate determined to be a rod peak value in either the first signal line drive mode or the second signal line drive mode; The touch panel controller according to claim 1, further comprising: The finger peripheral threshold is provided to determine the strength of the capacitance signal in a plurality of peripheral regions surrounding the finger peak value region corresponding to the finger peak value candidate, and is smaller than the finger threshold.
The rod-shaped body peripheral threshold is provided for determining the strength of a capacitance signal in a plurality of peripheral regions surrounding the rod-shaped peak value region corresponding to the rod-shaped body peak value candidate, and is smaller than the rod-shaped body threshold. Item 3. The touch panel controller according to item 1 or 2.   A touch panel system comprising the touch panel controller according to any one of claims 1 to 3 and the touch panel.   The touch panel controller according to claim 1, wherein a portion of the bar-shaped body that is in contact with the touch panel is thinner than the finger. A peak value detection step of detecting a peak value on the touch panel of a capacitance signal based on a touch on the touch panel with a finger or a rod;
A finger threshold filter step of determining whether or not the peak value is a finger peak value candidate based on a finger threshold;
A finger peripheral threshold filter step of determining whether the finger peak value candidate is a finger peak value based on a touch with the finger based on a finger peripheral threshold;
A rod-shaped body threshold value filter step for determining whether or not the peak value is a rod-shaped body peak value candidate based on a rod-shaped body threshold value;
A rod periphery threshold filter step for determining whether the rod peak value candidate is a rod peak value based on a touch by the rod, based on a rod periphery threshold, and
The rod-like-body-periphery-threshold filtering step determines whether or not the finger peak value candidate determined not to be the finger peak value by the finger-periphery-threshold filtering step is the rod-like body peak value based on the rod-like body surrounding threshold. A touch position detection method characterized by:

Images