JP6901364B2 - Touch panel device and position detection method of touch panel device - Google Patents

Description

The present disclosure relates to a touch panel device and a position detection method in the touch panel device.

The resistive touch panel has a method called a 7-wire type (for example, Patent Document 1). In the 7-wire touch panel, the shape of the electrodes is changed from the structure of the 5-wire touch panel, and the linearity is improved by controlling the direction of the current flowing on the panel by a diode.

Japanese Patent No. 3342539

In the resistive film type 4-wire and 5-wire touch panels, there are methods for detecting the positions of two points when they come into contact with each other at the same time, and methods for detecting gesture movements that change the relative positions of these two points. Proposed.

On the other hand, in the 7-wire touch panel, only the position detection of one-point contact is proposed, and the position detection of two-point contact and the gesture detection by two-point operation are not supported. Therefore, the 7-wire touch panel has restrictions on the detectable operation pattern as compared with the 4-wire type and the 5-wire type, and improvement in operability is desired.

An object of the present disclosure is to provide a touch panel device having improved operability in a 7-wire system and a method for detecting the position of the touch panel device.

The touch panel device according to one aspect of the embodiment includes a first resistance film, a second resistance film arranged to face the first resistance film, and both ends of the second resistance film in the first direction. The first electrode and the second electrode provided in the above, the third electrode and the fourth electrode provided at both ends of the second resistance film orthogonal to the first direction in the second direction, and the above. Controlling a first voltage dividing resistance connected to one of the first electrode or the second electrode and a second voltage dividing resistance connected to one of the third electrode or the fourth electrode. The control unit is attached to the second resistance film via the first voltage dividing resistor so that the first electrode has a high potential and the second electrode has a low potential. A voltage is applied to measure the first-direction voltage applied to the first direction of the second resistance film, and the third electrode has a high potential and the fourth electrode has a low potential. A voltage is applied to the second resistance film via the second voltage dividing resistor, the second direction voltage applied to the second direction of the second resistance film is measured, and the measured first direction voltage is measured. And, based on the second direction voltage, the distance between two points where the first resistance film and the second resistance film are in contact is calculated, and the first direction of the second resistance film is calculated. And the state where the directions of the two points are determined based on the film edge potential in the second direction, the first electrode is connected to the power supply potential, the second electrode is connected to the ground potential, and the third With the electrode connected to the power supply potential and the fourth electrode connected to the ground potential, the potential of the first resistance film is measured, and the potential of the first resistance film is measured based on the potential of the first resistance film. The coordinates of the middle point between the two points are calculated, and the coordinates of the two points are calculated based on the distance between the two points, the direction of the two points, and the coordinates of the middle point.

Similarly, the method for detecting the position of the touch panel device according to one aspect of the embodiment includes a first resistance film, a second resistance film arranged to face the first resistance film, and the second resistance film. The first electrode and the second electrode provided at both ends in the first direction of the film, and the third electrode and the third electrode provided at both ends of the second resistance film orthogonal to the first direction in the second direction, respectively. A fourth electrode, a first voltage dividing resistance connected to one of the first electrode or the second electrode, and a second connected to one of the third electrode or the fourth electrode. This is a method for detecting the position of a touch panel device having the voltage dividing resistance of the above, and the first electrode has a high potential and the second electrode has a low potential. A voltage is applied to the second resistance film to measure the first-direction voltage applied to the first direction of the second resistance film, the third electrode has a high potential, and the fourth electrode has a low potential. A measurement step in which a voltage is applied to the second resistance film via the second voltage dividing resistor to measure the second-direction voltage applied to the second direction of the second resistance film. Based on the first-direction voltage and the second-direction voltage measured in the measurement step, the distance between two points where the first resistance film and the second resistance film are in contact is determined. The distance calculation step to be calculated, the direction determination step of determining the directions of the two points based on the film edge potentials of the first direction and the second direction of the second resistance film, and the power supply of the first electrode. The first resistance is connected to a potential and the second electrode is connected to the ground potential, and the third electrode is connected to the power potential and the fourth electrode is connected to the ground potential. The midpoint calculation step of measuring the potential of the membrane and calculating the coordinates of the midpoint between the two points based on the measured potential, the distance between the two points calculated in the distance calculation step, and the direction determination step. Includes a coordinate calculation step of calculating the coordinates of the two points based on the directions of the two points determined in (1) and the coordinates of the middle point calculated in the middle point calculation step.

According to the present disclosure, it is possible to provide a touch panel device having improved operability in a 7-wire system and a method for detecting the position of the touch panel device.

The figure which shows the schematic structure of the 7-wire touch panel apparatus which concerns on embodiment. A flowchart showing a procedure of a position detection method of the touch panel device of the embodiment. The figure which shows the equivalent circuit of the touch panel in S01 The figure which shows the equivalent circuit at the time of the potential measurement in the X direction in S04. The figure which shows the equivalent circuit at the time of the potential measurement in the Y direction in S04. The figure which shows the equivalent circuit at the time of the potential measurement in the X direction in S05. The figure which shows the equivalent circuit at the time of the potential measurement in the Y direction in S05. The figure which shows the characteristic about the distance between two points and the voltage in X direction at the time of two points contact. Schematic diagram showing a pattern in the direction between two contact points The figure which shows the change of the potential appearing at the resistance film edge XL, YL when the two-point contact is in the D3, D4 directions. The figure which shows the change of the potential appearing at the resistance film edge XH, YH when the two-point contact is in the D3, D4 direction The figure which shows the change of the potential appearing at the resistance film edge XL, YL when the two-point contact is in the D1 and D2 directions. The figure which shows the change of the potential appearing at the resistance film edge XH, YH when the two-point contact is in the D1 and D2 directions.

Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

[Embodiment]
The embodiment will be described with reference to FIGS. 1 to 10. First, the configuration of the 7-wire touch panel device 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of a 7-wire touch panel device 1 according to an embodiment. In each figure, the X direction and the Y direction are orthogonal to each other, the X direction is the extending direction of one opposite side of the rectangular resistance films 10 and 20, and the Y direction is the direction of the resistance films 10 and 20. It is the extending direction of the other opposite side. The X direction is also referred to as the first direction, and the Y direction is also referred to as the second direction.

As shown in FIG. 1, the touch panel device 1 is a 7-wire type resistor film type. The touch panel device 1 includes a pair of resistance films 10 (first resistance film) and resistance film 20 (second resistance film) arranged so as to face each other, and a control unit 30.

The resistance films 10 and 20 are formed on the surface of a glass substrate, a transparent film, or the like with a transparent conductive film such as ITO (Indium Tin Oxide). The resistance films 10 and 20 are formed in a rectangular shape, for example, as shown in FIG.

The resistance film 10 corresponds to a voltage measuring probe of the resistance film 20 used for coordinate detection.

The resistance film 20 is provided with an electrode group 21 (first electrode) on one end in the X direction and an electrode group 22 (second electrode) on the other end, respectively, along the Y direction. Further, the resistance film 20 is provided with an electrode group 23 (third electrode) on one end in the Y direction and an electrode group 24 (fourth electrode) on the other end along the X direction. Each of the electrode groups 21, 22, 23, 24 arranged on the resistance film 20 is separated into a plurality of electrodes in order to suppress distortion of the potential distribution.

A diode 25 for passing a current from the power supply potential Vcc is connected to each electrode of the electrode group 21. A diode 26 that guides the current flowing from the resistance film 20 to the ground potential is connected to each electrode of the electrode group 22. A diode 27 for passing a current from the power supply potential Vcc is connected to each electrode of the electrode group 23. A diode 28 that guides the current flowing from the resistance film 20 to the ground potential is connected to each electrode of the electrode group 24.

By controlling the direction of the current flowing on the touch panel by using the diodes 25, 26, 27, and 28 in this way, the linearity of the touch panel device 1 can be improved, and the backflow of the current can be prevented. The linearity indicates the linear accuracy of the touch panel device 1. The linearity can be calculated, for example, as a ratio indicating how much the input position measured when the touch panel is pressed deviates from the theoretical input position.

The electrode group 21 is connected to the switch SW1 connected to the power supply potential Vcc and the switch SW2 connected to the Vcc via the voltage dividing resistor R1 (first voltage dividing resistor). The electrode group 22 is connected to the switch SW6 connected to the ground potential. The electrode group 23 is connected to the switch SW4 connected to the power supply potential Vcc and the switch SW5 connected to the Vcc via the voltage dividing resistor R2 (second voltage dividing resistor). The electrode group 24 is connected to the switch SW3 connected to the ground potential. The switches SW1 to SW6 are mounted by, for example, a transistor.

One of the electrodes in the electrode group 21 is provided with a measurement point XH for measuring the potential at the edge of the resistance film on the high potential side in the X direction. The measurement point XH is connected to the voltage measurement unit AD4 of the AD converter 31 provided in the control unit 30.

One of the electrodes in the electrode group 22 is provided with a measurement point XL for measuring the potential at the edge of the resistance film on the low potential side in the X direction. The measurement point XL is connected to the voltage measurement unit AD2 of the AD converter 31.

One of the electrodes in the electrode group 23 is provided with a measurement point YH for measuring the potential at the edge of the resistance film on the high potential side in the Y direction. The measurement point YH is connected to the voltage measurement unit AD5 of the AD converter 31.

One of the electrodes in the electrode group 24 is provided with a measurement point YL for measuring the potential at the edge of the resistance film on the low potential side in the Y direction. The measurement point YL is connected to the voltage measurement unit AD3 of the AD converter 31.

The wiring from each measurement point XH, XL, YH, YL to the AD converter 31 is drawn out so as not to intersect with the wiring of each electrode group 21, 22, 23, 24 as much as possible. Therefore, the measurement points XH, XL, YH, and YL are arranged near the two opposite corners of the four corners of the resistance film 20. In the example of FIG. 1, the measurement points XH and YH are arranged near the corners of the resistance film 20 on the X positive direction side and the Y negative direction side, and the measurement points XL and YL are on the X negative direction side and the Y positive direction. It is arranged near the corner of the resistance film 20 on the side.

Wiring is pulled out from the midpoint between the electrode group 21 and the voltage dividing resistor R1 and connected to the voltage measuring unit AD6. Further, a wiring is pulled out from an intermediate point between the electrode group 23 and the voltage dividing resistor R2, and is connected to the voltage measuring unit AD7.

The resistance value of the voltage dividing resistor R1 is preferably equal to the combined resistance value of the resistance film 20 between the electrode group 21 and the electrode group 22 in the X direction and the diodes 25 and 26. Similarly, the resistance value of the voltage dividing resistor R2 is preferably equal to the combined resistance value of the resistance film 20 between the electrode group 23 and the electrode group 24 in the Y direction and the diodes 27 and 28. For example, when the power supply potential Vcc is 5V, the resistance values of the voltage dividing resistors R1 and R2 are set so that the voltage dividing values that can be measured by the voltage measuring unit AD6 and the voltage measuring unit AD7 at the time of non-contact and one-point contact are 2.5V. It is preferable to set it.

The resistance film 10 is connected to the switch SW7 connected to the ground potential via the voltage dividing resistor R3, and is also connected to the voltage measuring unit AD1 for detecting the potential in the AD converter 31 of the control unit 30. ing.

The switches SW1, SW2, SW3, SW4, SW5, SW6, SW7 are SW1 control terminal, SW2 control terminal, SW3 control terminal, SW4 control terminal, SW5 control terminal, SW6 control terminal and SW7 control terminal provided in the control unit 30. Are connected to each.

The control unit 30 controls the voltage applied to the touch panel device 1 and determines whether or not there is contact with the touch panel by setting the switches SW1, SW2, SW3, SW4, SW5, SW6, and SW7 on and off. The control unit 30 uses the AD converter 31 to read the voltage value appearing on the touch panel device 1, and detects the positions of the two contact points at the time of two-point contact.

The control unit 30 is physically a computer device having a CPU, a memory, an input interface, an output interface, and the like. The control unit 30 performs various controls by causing the CPU to execute a program stored in the memory.

Next, the position detection method of the touch panel device 1 of the present embodiment will be described with reference to FIGS. 2 to 10. FIG. 2 is a flowchart showing the procedure of the position detection method of the touch panel device 1 of the present embodiment. Each process of the flowchart shown in FIG. 2 is executed by the control unit 30 of the touch panel device 1, for example, at predetermined intervals.

In S01, touch-on detection is performed to determine whether or not the touch panel device 1 is being operated (touch-on). Specifically, the touch-on detection is performed by measuring the potential with the voltage measuring unit AD1 with the switches SW1, SW4, and SW7 turned on and the switches SW2, SW3, SW5, and SW6 turned off. The equivalent circuit at this time is as shown in FIG. 3, and the potentials of the electrode group 21 and the electrode group 23 of the resistance film 20 are the power supply potential Vcc.

In S02, it is determined whether or not touch-on is performed based on the potential of the voltage measuring unit AD1 measured in S01. When a finger or a pen is in contact with the touch panel device 1, the resistance film 10 and the resistance film 20 come into contact with each other at the contact point. Therefore, in the voltage measuring unit AD1, the resistance film 10 and the voltage dividing resistor R3 cause the power supply potential. The potential at which Vcc is divided is detected. When the potential is detected by the voltage measuring unit AD1, it is determined that the touch panel device 1 is touch-on (Yes in S02), and the process proceeds to S04.

The voltage dividing resistance R3 is, for example, with respect to the longitudinal resistance value of the resistance film 20 when the longitudinal resistance value of the resistance film 20 is larger than the longitudinal resistance value of the resistance film 10. It is preferable that the resistance value is 4 times or more. In this case, assuming that the power supply potential Vcc is 5V, it can be determined that the touch-on is performed when the potential measured by the voltage measuring unit AD1 (that is, the voltage dividing voltage applied to the resistance film 10) exceeds 4V.

On the other hand, when it is determined in S02 that the touch-on is not performed (No in S02), the process proceeds to S03, and the initial partial pressure values in the X and Y directions are measured.

The initial value of the divided voltage is the divided voltage related to the combined resistance of the resistance film 20 and the diode in a state where the operator's finger or the like is not in contact with the touch panel device 1. In the present embodiment, the voltage dividing resistor R1 is a resistance value equal to the combined resistance value of the resistance in the X direction of the resistance film 20 and the diodes 25 and 26, and the voltage dividing resistor R2 is the resistance film 20. The resistance value is equal to the combined resistance value of the resistance in the Y direction and the diodes 27 and 28. Therefore, when the power supply potential Vcc is 5V, the voltage dividing voltage in both the X direction and the Y direction is theoretically 2.5V. However, in reality, there may be some differences due to the influence of product variations of each element, but by the processing of S03, the initial value of partial pressure according to the conditions of the equipment actually used is obtained and the two-point position is located. The accuracy of detection can be improved.

The equivalent circuit at the time of measuring the initial value of partial pressure in S03 has the same circuit configuration as the distance information measurement in S04 described later (see FIGS. 4 and 5), and the initial value of partial pressure is divided by the voltage measuring unit AD6 and the voltage measuring unit AD7. To measure. The voltage value measured by the voltage measuring unit AD6 is used as the initial voltage dividing value in the X direction (first voltage dividing initial value), and the voltage value measured by the voltage measuring unit AD7 is used as the voltage dividing initial value in the Y direction (first voltage dividing initial value). As the second initial value of voltage division), it is stored in the control unit 30 and used in each process described later. When the process of S03 is completed, this control flow is terminated.

In addition, there is a case where the process shifts to the process after S04 without executing the process of S03. Examples of such a situation include a case where the touch panel device 1 has already been operated on one-point contact or two-point contact at the time of activation. Therefore, for example, the theoretical value of the initial partial pressure value is stored in the control unit 30 in advance, and when the initial value of the partial pressure division in S03 is not measured, this theoretical value is used in the processing described later. May be good.

In S04, the distance information is measured. Here, the distance information refers to voltage value information used for calculating the distance between two contact points at the time of two-point contact in the process of S10 described later.

The voltage value measurement, which is the basis of the distance information in the X direction, is performed by setting the switches SW2 and SW6 to ON and the remaining switches to OFF. The equivalent circuit at this time is as shown in FIG. 4, and the voltage value appearing between the voltage dividing resistor R1 and the touch panel is measured by the voltage measuring unit AD6. Hereinafter, this voltage value is also referred to as an X-direction voltage (first-direction voltage).

The voltage value measurement, which is the basis of the distance information in the Y direction, is performed by setting the switches SW3 and SW5 to ON and the remaining switches to OFF. The equivalent circuit at this time is as shown in FIG. 5, and the voltage value appearing between the voltage dividing resistor R2 and the touch panel is measured by the voltage measuring unit AD7. Hereinafter, this voltage value is also referred to as a Y-direction voltage (second-direction voltage).

In FIGS. 4 and 5, the time of two-point contact is illustrated, in FIG. 4, the positions of the two contact points in the X direction are represented by points a and b, and in FIG. 5, the positions of the two contact points in the Y direction are points. It is represented by c and d. As shown in FIGS. 4 and 5, resistance is also generated between the two points of the resistance film 10 at the time of two-point contact, and this resistance is parallel to the resistance component between the two points of the resistance film 20. Due to such an arrangement of resistors, the resistance value between the electrode groups of the resistance film 20 becomes smaller at the time of two-point contact than at the time of one-point contact, so that the voltage dividing voltage measured by the voltage measuring unit AD6 and the voltage measuring unit AD7 also becomes smaller. .. Further, since the resistance value of the resistance film 10 fluctuates according to the distance between the points a and b in FIG. 4 and the distance between the points c and d in FIG. 5, the divided voltage also fluctuates in the same manner. For example, as the distance between two points increases, the voltage dividing voltage decreases. As described above, since the voltage dividing voltage is the information corresponding to the distance between the two points, it is used as the distance information in S04. When the process of S04 is completed, the process proceeds to S05.

In S05, the coordinates of the contact point are measured. The coordinate measurement in the X direction is performed by setting the switches SW1 and SW6 to ON and the remaining switches to OFF. The equivalent circuit at this time is as shown in FIG. 6, a potential distribution is generated in the X direction of the resistance film 20, and the potential that appears according to the contact position in the X direction is measured by the voltage measuring unit AD1. Then, the X coordinate of the contact point is calculated based on the potential measured by the voltage measuring unit AD1.

The coordinate measurement in the Y direction is performed by setting the switches SW4 and SW3 to ON and the remaining switches to OFF. The equivalent circuit at this time is as shown in FIG. 7, a potential distribution is generated in the Y direction of the resistance film 20, the potential appearing according to the contact position in the Y direction is measured by the voltage measuring unit AD1, and the voltage measuring unit AD1 The Y coordinate of the contact point is calculated based on the potential measured by.

The X and Y coordinates calculated in this way are the coordinates of the contact point when there is one contact point, and are the coordinates of the midpoint between the two points when there are two contact points. When the process of S05 is completed, the process proceeds to S06.

In S06, it is determined whether the current touch-on state is a two-point contact or a one-point contact. In S06, the characteristics shown in FIG. 8 are used. FIG. 8 is a diagram showing characteristics regarding the distance between two points and the voltage in the X direction at the time of contact between two points. The horizontal axis of FIG. 8 shows the ratio (%) of the distance between two points in the X direction of the resistance films 10 and 20. The vertical axis of FIG. 8 shows the voltage in the X direction to be measured. In FIG. 8, the characteristics of the voltage in the X direction according to the distance between the two points when the contact points of the two points are along the Y direction (D2 direction in FIG. 9) are plotted in a circle, and the contact points of the two points are X. The characteristics of the X-direction voltage according to the distance between the two points when along the direction (D1 direction in FIG. 9) are plotted in a triangle. Further, the initial value of the partial pressure in the X direction is shown by a dotted line. The voltage in the X direction in FIG. 8 is a voltage value measured by the voltage measuring unit AD6 in the equivalent circuit of FIG.

As shown in FIG. 8, when the contact points of the two points are along the Y direction, the voltage in the X direction is substantially the same as the initial value of the partial pressure regardless of the distance between the two points. On the other hand, when the contact points of the two points are along the X direction, it can be seen that the voltage in the X direction decreases as the distance between the two points increases, and the potential difference with respect to the initial value of partial pressure increases.

The characteristics related to the distance between the two points and the voltage in the Y direction at the time of contact between the two points are replaced with the graph shown in FIG. That is, when two points are pressed along the X direction, the voltage in the Y direction is almost the same as the initial value of the voltage division regardless of the distance between the two points, and when two points are pressed along the Y direction, the voltage is in the Y direction. The voltage decreases as the distance between the two points increases, and the potential difference with respect to the initial value of voltage division increases. The voltage in the Y direction is a voltage value measured by the voltage measuring unit AD7 in the equivalent circuit of FIG.

In S06, the two-point contact and the one-point contact are discriminated by utilizing the characteristics of the X-direction voltage and the Y-direction voltage at the time of such two-point contact. That is, at least one of the voltage value measured by the voltage measuring unit AD6 in the equivalent circuit of FIG. 4 or the voltage value measured by the voltage measuring unit AD7 in the equivalent circuit of FIG. 5, that is, at least the distance information measured in S04. If one of them is smaller than the initial value of the divided voltage, it is determined that the two-point contact state is present (Yes in S06), and the process proceeds to S08. On the other hand, when both the voltage measuring units AD6 and AD7 are equivalent to the initial value of the divided voltage, it is determined that the voltage measuring unit is in a one-point contact state (No in S06), and the process proceeds to S07.

In S07, the X coordinate and the Y coordinate calculated in S05 are output as the coordinates of one contact point. When the process of S07 is completed, this control flow is terminated.

In S08, the potential of the film end XL in the X direction of the resistance film 20 and the potential of the resistance film edge YL in the Y direction are measured. The potential of the film edge XL is measured by the voltage measuring unit AD2 with the switches SW2 and SW6 set to ON and the remaining switches set to OFF. The equivalent circuit at this time has the same configuration as that shown in FIG.

The potential of the film edge YL is measured by the voltage measuring unit AD3 with the switches SW3 and SW5 set to ON and the remaining switches set to OFF. The equivalent circuit at this time has the same configuration as that shown in FIG. When the processing of S08 is completed, the process proceeds to S09.

In S09, the arrangement direction of the two contact points is determined. In the present embodiment, the direction determination is performed by using the distance information calculated in S04 and the potentials of the resistance film edges XL and YL measured in S08. The distance information is a voltage value measured by the voltage measuring units AD6 and AD7 in the equivalent circuits of FIGS. 4 and 5. The potentials of the resistance film ends XL and YL are voltage values measured by the voltage measuring units AD2 and AD3 in the equivalent circuits of FIGS. 4 and 5.

FIG. 9 is a schematic view showing a pattern in the arrangement direction of two contact points. As shown in FIG. 9, the directions between the two points determined in S09 are four patterns of D1 direction, D2 direction, D3 direction, and D4 direction. The D1 direction is a pattern in which two points are separated from each other in the direction along the X direction and are in contact with the touch panel. The D2 direction is a pattern in which two points are separated from each other in the direction along the Y direction and are in contact with the touch panel. The D3 direction is a pattern in which two points are separated in an oblique direction (upward to the right in FIG. 9) extending from the X negative direction and the Y negative direction side to the X positive direction and the Y positive direction side. The D4 direction is a pattern in which two points are separated in an oblique direction (upward to the left in FIG. 9) extending from the X positive direction and the Y negative direction side to the X negative direction and the Y positive direction side.

In the present embodiment, the direction determination is performed in two steps. In the first stage, the distance information calculated in S04 is used to discriminate between the three types of the D1 direction, the D2 direction, and the diagonal direction (D3 and D4).

The detection in the D1 direction utilizes the characteristics of the voltage in the X direction at the time of two-point contact shown in FIG. As shown in FIG. 8, when the contact points of the two points are along the X direction, the voltage in the X direction measured by the voltage measuring unit AD6 is smaller than the initial value of the partial pressure, and the contact points of the two points are along the Y direction. There is almost no change when you are there. Therefore, when the voltage in the X direction is smaller than the initial value of partial pressure, it can be determined that the positions of the two contact points are in the D1 direction.

The detection in the D2 direction utilizes this characteristic because the relationship of the change in the voltage in the Y direction at the time of two-point contact is opposite to that of the voltage in the X direction shown in FIG. That is, when the voltage in the Y direction is smaller than the initial value of partial pressure, it is determined that the positions of the two contact points are in the D2 direction.

When both the X-direction voltage and the Y-direction voltage are smaller than the initial value of partial pressure, it is determined that the positions of the two contact points are in the oblique direction.

If it is determined in the first stage that the direction is diagonal, the process proceeds to the second stage. In the second step, the potentials of the resistance film edge XL and YL measured in S08 are used to determine which of the D3 direction and the D4 direction is oblique.

For the determination in the oblique direction, the characteristics shown in FIG. 10 regarding the potentials of the resistance film edges XL and YL are used. FIG. 10 is a diagram showing changes in potentials appearing at the resistance film ends XL and YL when the two-point contact is in the D3 direction and the D4 direction. The horizontal axis of FIG. 10 shows the ratio (%) of the distance between two points as in FIG. In the case of XL, it is the ratio of the distance between two points in the X direction, and in the case of YL, it is the ratio of the distance between two points in the Y direction. The vertical axis of FIG. 10 shows the voltage value at the edge of the resistor film, in the case of XL, shows the voltage value measured by the voltage measuring unit AD2, and in the case of YL, shows the voltage value measured by the voltage measuring unit AD3.

In FIG. 10, the characteristics of the potential of the resistance film edge XL in the X direction when the two contact points are along the D3 direction are plotted in a circle, and the characteristics of the potential of the resistance film edge YL in the Y direction are plotted in a diamond shape. doing. In addition, the potential characteristics of the resistance film edge XL in the X direction when the two contact points are along the D4 direction are plotted with US marks, and the potential characteristics of the resistance film edge YL in the Y direction are plotted with triangles. ing.

As shown in FIG. 10, when the distance between two points is the same, the voltage value appearing at the measurement point XL at the time of two-point contact in the D3 direction is larger than the voltage value appearing at the measurement point XL at the time of two-point contact in the D4 direction. Similarly, the voltage value appearing at the measurement point YL at the time of two-point contact in the D3 direction is larger than the voltage value appearing at the measurement point YL at the time of two-point contact in the D4 direction. Further, the amount of change in the voltage value according to the distance between the two points in the D3 direction and the D4 direction is different, and as the distance between the two points increases, the voltage value at the time of contact in the D3 direction increases with respect to the voltage value at the time of contact in the D4 direction. The amount tends to be large.

In the second stage of S09, it is determined whether the positions of the contact points of the two points are in the D3 direction or the D4 direction by utilizing the potential characteristics of the resistance film ends XL and YL. For example, when the rate of change in the potentials of the resistance film edges XL and YL is larger than a certain value with respect to a predetermined reference value, it can be determined to be in the D3 direction. When the process of S09 is completed, the process proceeds to S10.

In S10, the distance between the two contact points is calculated using the distance information in the X direction and the distance information in the Y direction measured in S04.

The distance Lx between two points in the X direction can be derived, for example, by the approximate expression shown in the following equation (1).

ここでΔＶｘは、Ｘ方向の分圧初期値から電圧測定部ＡＤ６で測定された電圧値を引いた値であり、α_Ｘ，β_Ｘ，γ_Ｘは各項の係数である。

Here, ΔVx is a value obtained by subtracting the voltage value measured by the voltage measuring unit AD6 from the initial value of the voltage division in the X direction, and α _X , β _X , and γ _X are the coefficients of each term.

The distance Ly between two points in the Y direction can be derived, for example, by the approximate expression shown in the following equation (2).

ここでΔＶｙは、Ｙ方向の分圧初期値から電圧測定部ＡＤ７で測定された電圧値を引いた値であり、α_Ｙ、β_Ｙ、γ_Ｙは各項の係数である。Ｓ１０の処理が完了するとＳ１１に進む。

Here, ΔVy is a value obtained by subtracting the voltage value measured by the voltage measuring unit AD7 from the initial value of the voltage division in the Y direction, and α _Y , β _Y , and γ _Y are the coefficients of each term. When the process of S10 is completed, the process proceeds to S11.

In S11, the coordinates of the contact points of the two points are output. Specifically, based on the coordinates of the midpoint between the two points calculated in S05, the distance between the two points calculated in S10 is added or subtracted along the direction determined in S09, and the contact points of the two points are added or subtracted. Calculate the coordinates of.

When calculating the X coordinate of two points, the X coordinate of one contact point is added to the X coordinate detected in S05 by adding half the value of the distance between the two points in the X direction calculated in S10. Is calculated, and the X coordinate of the other contact point is calculated by subtracting half the value of the distance between the two points in the X direction.

When calculating the Y coordinates of two points, the Y coordinate of one contact point is added to the Y coordinate detected in S05 by adding half the value of the distance between the two points in the Y direction calculated in S10. The coordinates are calculated, and the Y coordinate of the other contact point is calculated by subtracting half the value of the distance between the two points in the Y direction. When the process of S11 is completed, this control flow ends.

Of the processing steps shown in the flowchart of FIG. 2, S03 is a partial pressure initial value setting step, S04 is a measurement step, S05 is a midpoint calculation step, S06 is a two-point contact detection step, S09 is a direction determination step, and S10. Can also be expressed as a distance calculation step, and S11 can also be expressed as a coordinate calculation step.

In the present embodiment, by executing the above steps, it is possible to determine the coordinates of the two contact points and the direction in which the two contact points are lined up. Further, by repeating the above steps and determining the direction in which the two contact points are lined up and the change in the distance between the two points, it is possible to detect gesture operations such as pinch-in / pinch-out and rotation. As described above, according to the touch panel device 1 according to the present embodiment and the position detection method of the touch panel device 1, it is possible to detect the position of two-point contact and the gesture operation by the two-point operation on the 7-wire touch panel. Therefore, the operability of the 7-wire touch panel is improved.

[Modification example]
A first modification of the above embodiment will be described with reference to FIG. In the processing of S08 and S09 in FIG. 2, the potential of the resistance film end XH on the high potential side in the X direction and the potential of the resistance film edge YH on the high potential side in the Y direction are used instead of the resistance film ends XL and YL. You can also.

FIG. 11 is a diagram showing changes in potentials appearing at the resistance film edges XH and YH when the two-point contact is in the D3 direction and the D4 direction. The horizontal axis of FIG. 11 is the same as that of FIG. The vertical axis of FIG. 11 shows the voltage value at the edge of the resistor film, XH shows the voltage value measured by the voltage measuring unit AD4 in the equivalent circuit of FIG. 4, and YH is measured by the voltage measuring unit AD5 in the equivalent circuit of FIG. Indicates the voltage value. The plot type of FIG. 11 is the same as that of FIG.

As shown in FIG. 11, the voltage value appearing at the measurement point XH of the resistance film 20 at the time of two-point contact in the D3 direction is smaller than the voltage value appearing at the measurement point XH at the time of two-point contact in the D4 direction. Similarly, the voltage value appearing at the measurement point YH of the resistance film 20 at the time of two-point contact in the D3 direction is smaller than the voltage value appearing at the measurement point YH at the time of two-point contact in the D4 direction. Further, the amount of change in the voltage value according to the distance between the two points in the D3 direction and the D4 direction is different, and as the distance between the two points increases, the voltage value at the time of contact in the D3 direction decreases with respect to the voltage value at the time of contact in the D4 direction. The amount tends to be large.

In the second stage of S09, it is possible to determine whether the positions of the contact points of the two points are in the D3 direction or the D4 direction by utilizing the potential characteristics of the resistance film ends XH and YH.

A second modification of the above embodiment will be described with reference to FIG. In S09 of FIG. 2, a two-step process is performed to determine the four patterns in the direction between the two points, but it is also possible to determine the four patterns by using only the potentials of the resistance film edges XL and YL. That is, in the first step of S09, the D1 direction and the D2 direction can be discriminated by using XL and YL instead of the distance information calculated in S04.

FIG. 12 is a diagram showing changes in potentials appearing at the resistance film ends XL and YL when the two-point contact is in the D1 direction and the D2 direction. The vertical axis and the horizontal axis of FIG. 12 are the same as those of FIG. In FIG. 12, the potential characteristics of the resistance film edge XL in the X direction according to the distance between the two points when the contact points of the two points are along the D1 direction are plotted in a circle, and the resistance film edge YL in the Y direction is plotted. The potential characteristics are plotted in a diamond shape. In addition, the characteristics of the potential of the resistance film edge XL in the X direction according to the distance between the two points when the two contact points are along the D2 direction are plotted with a US mark, and the potential of the resistance film edge YL in the Y direction is plotted. The characteristics of are plotted in triangles.

Based on the characteristics shown in FIG. 12, XL and YL when two points are pressed in the D1 direction are "horizontal XL" and "horizontal YL", and XL and YL when two points are pressed in the D2 direction are "vertical XL". And "vertical YL", the following equation (3) holds.

(Vertical YL-Vertical XL)> (Horizontal YL-Horizontal XL) ... (3)

In the first stage of S09, it is determined whether the positions of the contact points of the two points are in the D1 direction or the D2 direction by utilizing the potential characteristics of the resistance film ends XL and YL. For example, when the difference between YL and XL is smaller than a certain value with respect to a predetermined reference value, it can be determined to be in the D1 direction.

Further, also in the second modification described with reference to FIG. 12, the potential of the resistance film end XH in the X direction and the resistance film in the Y direction are used instead of the resistance film ends XL and YL as in the first modification. The potential of the end YH can also be used.

FIG. 13 is a diagram showing changes in potentials appearing at the resistance film ends XH and YH when the two-point contact is in the D1 direction and the D2 direction. The vertical axis and the horizontal axis of FIG. 13 are the same as those of FIG. The plot type of FIG. 13 is the same as that of FIG.

Based on the characteristics shown in FIG. 13, XH and YH when two points are pressed in the D1 direction are "horizontal XH" and "horizontal YH", and XH and YH when two points are pressed in the D2 direction are "vertical XH". And "vertical YH", the following equation (4) holds.

(Vertical YH-Vertical XH)> (Horizontal YH-Horizontal XH) ... (4)

In the first stage of S09, it is determined whether the positions of the contact points of the two points are in the D1 direction or the D2 direction by utilizing the potential characteristics of the resistance film ends XH and YH. For example, when the difference between YH and XH is smaller than a certain value with respect to a predetermined reference value, it can be determined to be in the D1 direction.

Further, in the above embodiment, in S10 of FIG. 2, it is illustrated that the distance between two points is calculated as Lx and Ly by using the approximate expression by the quadratic polynomial of the equations (1) and (2). It can also be calculated using other approximation formulas such as polynomials higher than quadratic.

Further, in the above embodiment, the circuit configuration in which the voltage dividing resistors R1 and R2 are arranged between the resistance film 20 and the power supply potential Vcc is illustrated, but instead, the voltage dividing resistors R1 and R2 are referred to as the resistance film 20. It may be placed between the ground potential.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

1 Touch panel device 10 Resistor film (first resistor film)
20 Resistance film (second resistance film)
21 Electrode group (first electrode)
22 Electrode group (second electrode)
23 Electrode group (third electrode)
24 Electrode group (fourth electrode)
30 Control unit R1 voltage dividing resistor (first voltage dividing resistor)
R2 voltage divider resistor (second voltage divider resistor)
AD1, AD2, AD3, AD4, AD5, AD6, AD7 Voltage measuring unit SW1, SW2, SW3, SW4, SW5, SW6, SW7 Switch

Claims (4)

The first resistance film and
A second resistance film arranged to face the first resistance film,
The first electrode and the second electrode provided at both ends of the second resistance film in the first direction, respectively,
A third electrode and a fourth electrode provided at both ends of the second resistance film orthogonal to the first direction in the second direction, respectively.
A first voltage dividing resistor connected to either the first electrode or the second electrode,
A second voltage dividing resistor connected to either the third electrode or the fourth electrode,
Control unit and
Have,
The control unit
A voltage is applied to the second resistance film through the first voltage dividing resistor so that the first electrode has a high potential and the second electrode has a low potential, so that the second resistance film has a high potential. Measure the first-direction voltage applied in the first direction of
A voltage is applied to the second resistance film through the second voltage dividing resistor so that the third electrode has a high potential and the fourth electrode has a low potential, so that the second resistance film has a high potential. Measure the second-direction voltage applied in the second direction of
Based on the measured first-direction voltage and the second-direction voltage, the distance between the two points where the first resistance film and the second resistance film are in contact is calculated.
The directions of the two points are determined based on the film edge potentials of the first direction and the second direction of the second resistance film.
A state in which the first electrode is connected to the power supply potential and the second electrode is connected to the ground potential, and a state in which the third electrode is connected to the power supply potential and the fourth electrode is connected to the ground potential. Then, the potential of the first resistance film was measured, and the coordinates of the midpoint between the two points were calculated based on the measured potential of the first resistance film.
The coordinates of the two points are calculated based on the distance between the two points, the direction of the two points, and the coordinates of the midpoint.
Touch panel device. The first resistance film and
A second resistance film arranged to face the first resistance film,
The first electrode and the second electrode provided at both ends of the second resistance film in the first direction, respectively,
A third electrode and a fourth electrode provided at both ends of the second resistance film orthogonal to the first direction in the second direction, respectively.
A first voltage dividing resistor connected to either the first electrode or the second electrode,
A second voltage dividing resistor connected to either the third electrode or the fourth electrode,
It is a position detection method of a touch panel device having
A voltage is applied to the second resistance film through the first voltage dividing resistor so that the first electrode has a high potential and the second electrode has a low potential, so that the second resistance film has a high potential. The first direction voltage applied to the first direction is measured, and the second is made through the second voltage dividing resistor so that the third electrode has a high potential and the fourth electrode has a low potential. A measurement step of applying a voltage to the resistance film and measuring the second-direction voltage applied to the second direction of the second resistance film, and a measurement step.
Based on the first-way voltage and the second-way voltage measured in the measurement step, the distance between two points where the first resistance film and the second resistance film are in contact is calculated. Distance calculation steps to be performed and
A direction determination step for determining the directions of the two points based on the film edge potentials of the first direction and the second direction of the second resistance film, and
A state in which the first electrode is connected to the power supply potential and the second electrode is connected to the ground potential, and a state in which the third electrode is connected to the power supply potential and the fourth electrode is connected to the ground potential. In the middle point calculation step, the potential of the first resistance film is measured, and the coordinates of the middle point between the two points are calculated based on the measured potential.
Based on the distance between the two points calculated in the distance calculation step, the direction of the two points determined in the direction determination step, and the coordinates of the midpoint calculated in the midpoint calculation step. The coordinate calculation step to calculate the coordinates of the point and
A method for detecting the position of a touch panel device including. The direction determination step determines the directions of the two points based on the film edge potential and the first-direction voltage and the second-direction voltage measured in the measurement step.
The position detection method for a touch panel device according to claim 2. When the first-way voltage measured in the measurement step is smaller than the first voltage dividing initial value, or the second-way voltage measured in the measuring step is smaller than the second voltage dividing initial value. The position detection method for a touch panel device according to claim 2 or 3, further comprising a two-point contact detection step for determining a two-point contact state.

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