JP5567193B2 - Touch panel and touch panel coordinate detection method - Google Patents

Description

  The present invention relates to a touch panel and a coordinate detection method for the touch panel.

  The resistive film type touch panel is formed so that an upper layer and a lower layer each having a transparent conductive film face each other. In this type of touch panel, the touch panel is pressed with a finger, a pen, or the like, and the upper layer conductive film and the lower layer conductive film come into contact with each other, thereby detecting the coordinates of the contact point.

  Patent Document 1 discloses a resistive film type touch panel in which a conductive film is formed of a transparent conductive polymer material. Patent Document 2 discloses a resistive film type touch panel in which a conductive film is formed of a conductive polymer or a metal oxide film.

JP 2005-182737 A JP 2008-135291 A

  In a multi-point input mode touch panel in which a conductive film is divided into a plurality of regions and a touch is detected in each region, a voltage used for coordinate detection is discharged in each region, so that a high-speed detection operation may be difficult.

  Alternatively, for example, a finger touching the touch panel may be slid to perform drawing on the touch panel. In such a drawing mode, if the processing speed of the touch panel is slow, drawing may not be performed smoothly.

  Alternatively, when there is a region including the lead wiring in the divided region of the conductive film, the pull-down resistance value or the filter shielding frequency may be changed for each region. As the number of pull-down resistance values and the frequency of changing the filter shielding frequency increases, the operation of the touch panel may be delayed accordingly.

  Alternatively, when the lead-out wiring and the area other than the lead-out wiring are touched across, it is determined that there is an input that is not intended by the user, and the touch panel may malfunction.

  In view of the above problems, an object of the present invention is to provide a touch panel and touch panel coordinate detection method capable of speeding up, or to provide a touch panel and touch panel coordinate detection method capable of improving the accuracy of coordinate detection.

The present invention provides a first conductive film that is divided into a plurality of regions that are insulated from each other, a second conductive film that faces and separates from the first conductive film, and a main region of the first region among the plurality of regions. The first conductive film and the second conductive film are in contact with each other of the first group consisting of the first wiring and the second group consisting of the second region out of the plurality of regions. A control unit that detects the coordinates of the point, and whether the control unit is in contact with the first conductive film and the second conductive film for each of the plurality of first groups and second groups. Judgment of the points where the first conductive film and the second conductive film are in contact with each other in the group in which the first conductive film and the second conductive film are in contact among the plurality of first groups and the second group. An operation for detecting coordinates is performed, and the plurality of first groups are And of the second group, in the group where the first conductive film and the second conductive film are not in contact, a touch panel that does not perform an operation for detecting the coordinates. According to the present invention, it is not necessary to correct the potential difference for each region, and it is not necessary to change the shielding frequency of the filter, so that the touch panel can be speeded up. Also, the number of touch-on check and coordinate detection controls is smaller than when sequential control is performed for each region. Accordingly, it is possible to increase the speed of the touch panel.

  In the above configuration, the first group and the second group are groups in which the plurality of regions are grouped in either row or column, and the lead-out wiring is in the other direction of the row or column. It can be set as the structure pulled out. According to this configuration, it is possible to increase the speed of the touch panel.

  The said structure WHEREIN: It can be set as the structure provided with the some filter which is connected to each of the said 1st group and the said 2nd group and from which a shielding frequency differs mutually. According to this configuration, since it is not necessary to change the shielding frequency of the filter for each region, the touch panel can be further speeded up.

  In the above configuration, in response to the contact between the first conductive film and the second conductive film, transmission is performed from each of the main regions of the plurality of first regions constituting each of the plurality of first groups. The signals are combined as one signal, and the signals transmitted from each of the plurality of first region lead wires and each of the plurality of second regions constituting each of the plurality of second groups are used as another signal. Coupling means for coupling, wherein the control section receives the first signal or the other signal coupled by the coupling means in response to receiving the first signal in the first group or the second group. It can be set as the structure judged that the electrically conductive film and the said 2nd electrically conductive film contacted. According to this configuration, with a simple configuration, it is possible to automatically determine a group in which the first conductive film and the second conductive film are in contact with each other, and to perform an operation of detecting coordinates.

  In the above configuration, the control unit may include a third region, a fourth region, and a fifth region lead-out wiring located between the third region and the fourth region among the plurality of regions. A first coordinate that is a coordinate of a point at which the first conductive film and the second conductive film are in contact with each other in the third region when the first conductive film and the second conductive film are in contact with each other; In the fourth region, the difference between the second coordinate which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other, and the first coordinate and the lead wiring in the fifth region When the difference between the third coordinate, which is the coordinate of the point where the first conductive film and the second conductive film are in contact, is within a predetermined range, the first coordinate and the second coordinate Based on the above, the fourth coordinate can be output. According to this configuration, even when coordinates are detected in a plurality of areas including the lead wiring, coordinates determined based on the detected coordinates are output. Therefore, the accuracy of coordinate detection of the touch panel is improved. In particular, the input at the lead-out wiring is ignored, and it is determined that there is an input at one point, so that malfunction can be suppressed.

  The said structure WHEREIN: The said control part can be set as the structure which outputs the average coordinate of a said 1st coordinate and a said 2nd coordinate as a said 4th coordinate. According to this configuration, the accuracy of coordinate detection of the touch panel is improved.

  In the above configuration, the control unit may include a fifth coordinate which is a coordinate of a point where the first conductive film and the second conductive film are in contact with each other in the main region of the fifth region, and the fourth coordinate. Based on this, it is possible to detect the sixth coordinate and output the fifth coordinate based on the fourth coordinate and the sixth coordinate. According to this configuration, even when coordinates are detected at two locations, the coordinates of the points that are actually input can be output. Therefore, the accuracy of coordinate detection of the touch panel is improved, and malfunctions can be suppressed.

  The said structure WHEREIN: The said control part can be set as the structure which uses the average coordinate of a said 4th coordinate and a said 5th coordinate as a 6th coordinate. According to this configuration, the accuracy of coordinate detection of the touch panel is improved, and malfunctions can be suppressed.

The present invention provides an operation of detecting coordinates of a point where a first conductive film divided into a plurality of regions insulated from each other and a second conductive film facing and spaced apart from the first conductive film are in contact with each other. The step of performing in the first group consisting of the main area of the first area among the plurality of areas, and the second group consisting of the lead wiring of the first area and the second area of the plurality of areas for detecting the coordinates Determining whether each of the first conductive film and the second conductive film is in contact with each of the plurality of first groups and the second group, and the plurality of first groups and the second group. Performing an operation of detecting coordinates of a point at which the first conductive film and the second conductive film are in contact with each other in a group in which the first conductive film and the second conductive film are in contact among two groups; Have, before Among the plurality of first and second groups, wherein the first conductive film and the second conductive film are not in contact groups, a coordinate detection method for a touch panel that does not perform operation of detecting the coordinates. According to the present invention, it is not necessary to correct the potential difference for each region, and it is not necessary to change the shielding frequency of the filter, so that the touch panel can be speeded up. Also, the number of touch-on check and coordinate detection controls is smaller than when sequential control is performed for each region. Accordingly, it is possible to increase the speed of the touch panel.

  In the above structure, the first conductive film and the second conductive film are located between the third region, the fourth region, the third region, and the fourth region of the plurality of regions. A first coordinate which is a coordinate of a point where the first conductive film and the second conductive film are in contact with each other in the third region when contacted in the five regions of the extraction wiring; and The difference between the second coordinate which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other, the first coordinate, and the first conductive film Determining whether a difference from a third coordinate, which is a coordinate of a point of contact with the second conductive film, is within a predetermined range, and a difference between the first coordinate and the second coordinate; And when the difference between the first coordinate and the third coordinate is within the predetermined range, Based on the first coordinate and the second coordinate, and outputting a fourth coordinate, it can be configured to have. According to this configuration, even when coordinates are detected in a plurality of areas including the lead wiring, coordinates determined based on the detected coordinates are output. Therefore, the accuracy of coordinate detection of the touch panel is improved. In particular, the input at the lead-out wiring is ignored, and it is determined that there is an input at one point, so that malfunction can be suppressed.

  The present invention outputs a coordinate of a point where a first conductive film divided into a plurality of regions that are insulated from each other and a second conductive film facing and spaced apart from the first conductive film are in contact with each other; After the outputting step, the coordinates of the points where the first conductive film and the second conductive film are in contact with each other are detected in the region where the coordinates were output in the outputting step and the region around the region where the coordinates were output. And when the coordinates are output in the step of outputting the coordinates, in the areas other than the areas where the coordinates are detected in the step of detecting the coordinates and the surrounding areas among the plurality of areas. The touch panel coordinate detection method does not detect the coordinates. According to the present invention, it is possible to increase the speed of the touch panel as compared with the case where coordinates are sequentially detected for all of the divided areas.

  According to the present invention, it is possible to provide a touch panel and a touch panel coordinate detection method capable of speeding up, or to provide a touch panel and touch panel coordinate detection method capable of improving the accuracy of coordinate detection.

1A and 1B are perspective views illustrating the configuration of the touch panel, and FIG. 1C is a plan view illustrating the configuration of the touch panel. FIG. 2 is a block diagram illustrating the touch panel according to the first embodiment. FIG. 3 is a diagram illustrating a configuration of the area selection unit 20. FIG. 4 is a flowchart illustrating the control of the touch panel according to the comparative example. FIG. 5 is a flowchart illustrating an example of touch ON check control. FIG. 6 is a flowchart illustrating the control of the touch panel according to the first embodiment. FIG. 7 is a flowchart illustrating the control of the touch panel according to the first embodiment. FIG. 8 is a flowchart illustrating the control of the touch panel according to the first embodiment. FIG. 9 is a flowchart illustrating the control of the touch panel according to the modification of the first embodiment. FIG. 10A and FIG. 10B are plan views illustrating the touch panel according to the second embodiment. FIG. 11 is a flowchart illustrating the control of the touch panel according to the second embodiment. FIG. 12 is a flowchart illustrating the control of the touch panel according to the second embodiment. FIG. 13 is a flowchart illustrating the control of the touch panel according to the second embodiment. FIG. 14 is a flowchart illustrating the touch panel control according to the modification of the second embodiment. FIG. 15 is a flowchart illustrating the control of the touch panel according to a modification of the second embodiment. FIG. 16 is a flowchart illustrating the touch panel control according to the modification of the second embodiment. FIG. 17 is a flowchart illustrating the control of the touch panel according to the modification of the second embodiment. FIG. 18 is a flowchart illustrating the touch panel control according to the modification of the second embodiment. FIG. 19 is a flowchart illustrating the control of the touch panel according to the modification of the second embodiment. FIG. 20 is a flowchart illustrating the touch panel control according to the modification of the second embodiment. FIG. 21 is a flowchart illustrating the control of the touch panel according to the modification of the second embodiment. FIG. 22 is a flowchart illustrating the control of the touch panel according to the modification of the second embodiment. FIG. 23A is a plan view illustrating a touch panel 300 including a lead wiring, and FIG. 23B is an enlarged view illustrating a lead wiring portion. FIG. 24 is a block diagram illustrating the area selection unit and the filter unit of the touch panel according to the third embodiment. FIG. 25 is a flowchart illustrating the control of the touch panel according to the third embodiment. FIG. 26A to FIG. 26C are diagrams illustrating the area selection unit according to the fourth embodiment. FIG. 27 is a flowchart illustrating the control of the touch panel according to the fourth embodiment. FIG. 28A is an enlarged view illustrating the lead-out wiring portion of the touch panel according to the fifth embodiment, and FIG. 28B is an enlarged view illustrating the lead-out wiring portion of the touch panel according to the modification of the fifth embodiment. . FIG. 29 is a flowchart illustrating control of the touch panel according to the fifth embodiment.

  Embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of the touch panel will be described. 1A and 1B are perspective views illustrating the configuration of the touch panel, and FIG. 1C is a plan view illustrating the configuration of the touch panel.

  FIG. 1A is a perspective view illustrating a resistive film 5-wire touch panel. As shown in FIG. 1A, the touch panel 100 includes a first conductive film 2, a second conductive film 4, and electrodes 6, 8, 10 and 12. The first conductive film 2 and the second conductive film 4 face each other and are spaced apart. Each of the first conductive film 2 and the second conductive film 4 is made of a conductor such as ITO (Indium Tin Oxide) or an organic conductive polymer. The second conductive film 4 includes electrodes 6, 8, 10, and 12 made of a metal such as Ag. Each of the electrodes 6, 8, 10, and 12 is disposed along the side in the peripheral portion of the second conductive film 4. That is, the electrodes 6 and 8 and the electrodes 10 and 12 are a set of electrodes facing each other. A voltage can be applied to the first conductive film 2 and the electrodes 6, 8, 10, and 12, respectively.

  The principle of the resistive film 5-wire touch panel will be described. The power supply voltage Vcc is applied to any one of the electrodes 6, 8, 10 and 12, for example, the electrode 6 here. A pull-down resistor is connected to the first conductive film 2. When the first conductive film 2 and the second conductive film 4 come into contact with each other, the electrode 6 to which Vcc is applied and the pull-down resistor are connected, and the potential applied to the pull-down resistor becomes a high potential. It is detected that the conductive film 2 and the second conductive film 4 are in contact. Here, when the voltage Vss is applied to the electrode 8 facing the electrode 6, a potential difference is generated between the electrode 6 and the electrode 8. Since the resistance of the conductive film changes depending on the distance from the electrode to the point where the first conductive film 2 and the second conductive film 4 are in contact with each other (dotted line portion in the figure), the first conductive is determined from the voltage generated between the electrodes. The coordinates of the point where the film 2 and the second conductive film 4 are in contact can be detected. In the configuration of FIG. 1A, a voltage is applied to the electrodes 6 and 8 to detect the X coordinate, and a voltage is applied to the electrodes 10 and 12 to detect the Y coordinate.

  FIG. 1B is a perspective view illustrating the touch panel 100 according to the first embodiment, and FIG. 1C is a plan view of the touch panel 100 of FIG. is there. FIG. 1C shows the directions of X and Y, which will be described later. As shown in FIGS. 1B and 1C, the first conductive film 2 is divided into 16 regions of 4 rows and 4 columns in a lattice shape. The region is F11 to F44. Each region is insulated from each other, and each region is connected to a pull-down resistor. For this reason, the contact between the first conductive film 2 and the second conductive film 4 can be detected for each region. That is, the touch panel 100 according to the first embodiment is a multipoint input touch panel.

  Next, the configuration of the touch panel control device will be described. FIG. 2 is a block diagram illustrating the configuration of the touch panel control device.

  As shown in FIG. 2, the control device 14 includes a control unit 16, an electrode control unit 18, a region selection unit 20, a filter unit 22, an A / D (Analog / Digital) conversion unit 24, and an interface unit 26. Is provided.

  The electrode controller 18 is connected to each of the electrodes 6, 8, 10 and 12 shown in FIGS. 1 (a) to 1 (c) and applies a voltage to each electrode and removes the applied voltage. To do. The region selection unit 20 is connected to the first conductive film 2 and selects a divided region of the first conductive film 2. The region selection unit 20 receives a signal transmitted by the selected region of the first conductive film 2 due to the contact between the first conductive film 2 and the second conductive film 4. The filter unit 22 includes a plurality of low-pass filters, for example. The filter unit 22 receives the signal transmitted by the first conductive film 2 via the region selection unit 20, removes noise, and transmits the signal to the A / D conversion unit 24. The A / D converter 24 converts the signal transmitted from the first conductive film 2 and noise-cut by the filter unit 22 from an analog signal to a digital signal.

  The control unit 16 is a microcomputer, for example, and controls the electrode control unit 18, the region selection unit 20, and the interface unit 26. In addition, the signal transmitted by the A / D converter 24 is received, and based on the received signal, it is determined in any of the regions F11 to F44 whether the first conductive film 2 and the second conductive film 4 are in contact with each other. . Further, the control unit 16 outputs the coordinates of the point where the first conductive film 2 and the second conductive film 4 are in contact. That is, the control unit 16 performs coordinate conversion from the received signal. The interface unit 26 outputs the coordinate information output by the control unit 16 to an external device such as a computer connected to the touch panel 100.

  Next, a configuration example of the region selection unit 20 will be described. FIG. 3 is a diagram illustrating a configuration of the area selection unit 20.

  As shown in FIG. 3, the regions F11 to F14 are connected to the multiplexer 30, the regions F21 to F24 are connected to the multiplexer 32, the regions F31 to F34 are connected to the multiplexer 34, and the regions F41 to F44 are connected to the multiplexer 36, respectively. Each of the multiplexers 30 to 36 receives a signal transmitted from the connected region, and receives a select signal transmitted from the control unit 16. The output sides of the multiplexers 30 to 36 are connected to the filter unit 22 and grounded via the transistor 38 and the pull-down resistor 40. That is, it is connected to the collector of the transistor 38. The emitter of the transistor 38 is grounded via a pull-down resistor 40, and a signal from the control unit 16 is input to the base of the transistor 38. Of the signals from the areas received by the multiplexers 30 to 36, the signal selected by the select signal is transmitted to the filter unit 22 and input to the pull-down resistor 40 via the transistor 38. Thereby, a high potential is applied to the pull-down resistor 40, and it is detected that the first conductive film 2 and the second conductive film 4 are in contact with each other.

  Next, control of the touch panel according to the first embodiment will be described. Prior to the description of the examples, a comparative example will be described first. FIG. 4 is a flowchart illustrating the control of the touch panel according to the comparative example. Of the divided regions of the first conductive film 2 shown in FIGS. 1B and 1C, the region of the mth row and the nth column is represented as Fmn.

  As shown in FIG. 4, the control unit 16 controls the region selection unit 20 so that the row number is m = 1, the column number is n = 1, and the region F11 is a control target (step S1). After step S1, the control unit 16 performs an operation to check whether the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn (step S2). That is, starting from the area F11, each area Fmn is a check target. In the flowchart, the operation of checking whether the first conductive film 2 and the second conductive film 4 are in contact with each other is referred to as “touch ON check”.

  Here, the touch ON check control will be described with reference to a flowchart. FIG. 5 is a flowchart illustrating the touch ON check control.

  As shown in FIG. 5, the electrode control unit 18 applies a voltage Vcc to the electrode 6 (step S14). After step S14, the region selection unit 20 connects the region Fmn to the pull-down resistor R (step S15). After step S15, the control unit 16 determines whether the potential of the pull-down resistor R is a high potential (step S16). If Yes in step S16, the control unit 16 determines that the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn (step S17). In the case of No in step S16, the control unit 16 determines that the first conductive film 2 and the second conductive film 4 are not in contact in the region Fmn (step S18). Control ends after steps S17 and S18.

  Returning to FIG. 4, the control after step S2 will be described. After step S2, the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn (step S3). The contact between the first conductive film 2 and the second conductive film 4 is referred to as “touch ON”. In No, it progresses to Step S10 mentioned below.

  In the case of Yes, the electrode control unit 18 applies Vcc to the electrode 6 and Vss to the electrode 8 (step S4). This is expressed as “electrode 6 = Vcc, electrode 8 = Vss”. The same applies to the electrodes 10 and 12 to be described later. After step S4, the control unit 16 detects the X coordinate of the point where the first conductive film 2 and the second conductive film 4 are in contact (step S5). After step S5, the controller 16 removes (discharges) the voltages applied to the electrodes 6 and 8 (step S6). After step S6, the electrode controller 18 applies Vcc to the electrode 10 and Vss to the electrode 12 (step S7). After step S7, the control unit 16 detects the Y coordinate of the region F11 (step S8). After step S8, the control unit 16 discharges the electrode 10 and the electrode 12 (step S9).

  After step S9 and in the case of No in step S3, the control unit 16 determines whether m is MAX (step S10). Here, “MAX” refers to the largest of the line numbers m assigned to the divided areas. That is, in the example of FIG. 1C, m being MAX means m = 4. In No, the control part 16 controls the area | region selection part 20 to increase the line number m by 1 (step S11). After step S11, the control returns to step S2, and the control unit 16 performs the control after step S2 on the region F21.

  If Yes in step S10, that is, if m = 4, the control unit 16 determines whether n is MAX (step S12). Here, “MAX” refers to the largest of the column numbers n assigned to the divided areas. That is, n = 4 is MAX. In the case of No, the control unit 16 controls the region selection unit 20 to set the row number to m = 1 and increase the column number n by one (step S13). After step S13, the control returns to step S2, and the control unit 16 performs the control after step S2 on the region F12. If yes in step S13, the control ends.

  In the comparative example shown in FIG. 4, the touch-on check (step S2), the X coordinate capture (step S5), and the Y coordinate capture (step S8) are sequentially performed in each region. As shown in steps S6 and S9 in FIG. 4, discharge is performed between the capture of the X coordinate and the capture of the Y coordinate. Discharging takes a certain amount of time. Therefore, when the conductive film is in contact with a plurality of regions, the number of times of decharging increases according to the number of the regions. Further, the control after step S2 in FIG. 4 is repeated as the number of regions increases. As a result, the operation of the touch panel may be slow. Thus, the multipoint input type touch panel has a problem in speeding up the touch panel.

  Next, control of the touch panel according to the first embodiment will be described. 6 and 7 are flowcharts illustrating the control of the touch panel according to the first embodiment.

  As shown in FIG. 6, first, the control unit 16 resets the flag of each region (step S20). After step S20, the control unit 16 performs the control of steps S1 to S3 in FIG. That is, the control unit 16 starts from the region F11 and determines whether the first conductive film 2 and the second conductive film 4 are in contact with each region Fmn. If No in step S3, the process proceeds to step S24 described later. In the case of Yes, the control part 16 sets a flag to the area | region Fmn judged to be touch ON (step S21).

  After step S21, the control unit 16 controls the electrode control unit 18 to apply Vcc to the electrode 6 and Vss to the electrode 8 (step S22). After step S22, the control unit 16 detects the X coordinate of the point where the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn (step S23). After step S23, the process proceeds to step S24. Steps S24 to S27 are the same as steps S10 to S13 in FIG. That is, after detecting the X coordinate, the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each other in a region different from the region determined to be touch-on in step S3. To do.

  In the case of Yes in step S26, the control unit 16 controls the electrode control unit 18 to discharge the voltage applied to each of the electrode 6 and the electrode 8 (step S28). That is, the control unit 16 removes the voltage applied to each of the electrode 6 and the electrode 8 after detecting the X coordinate in each of the regions Fmn. After step S28, the process proceeds to step S29 in FIG. 7 (see “A” in the figure).

  As shown in FIG. 7, after step S28, the control unit 16 controls the electrode control unit 18 to apply Vcc to the electrode 10 and Vss to the electrode 12 (step S29). After step S29, the control unit 16 sets the row number to m = 1 and the column number to n = 1 (step S30). After step S30, the control unit 16 checks whether a flag is set in any of the regions Fmn (step S31). After step S31, the control unit 16 determines whether the flag is set (step S32).

  In the case of Yes, the control part 16 detects the Y coordinate of the point which the 1st conductive film 2 and the 2nd conductive film 4 contacted in the area | region in which the flag was set (step S33). That is, the control unit 16 stores a region where the first conductive film 2 and the second conductive film 4 are in contact with each other, and detects the Y coordinate in the stored region. After Step S33 or if No in Step S32, the process proceeds to Step S34. Steps S34 to S37 are the same as steps S10 to S13 in FIG. In the case of Yes in step S36, the control unit 16 controls the electrode control unit 18 to discharge the voltage applied to each of the electrode 10 and the electrode 12 (step S38). After step S38, the control ends.

  According to the first embodiment, the discharge is performed after the X coordinate is detected in each of the regions Fmn, and then the discharge is performed after the Y coordinate is detected in each of the regions Fmn. Therefore, the discharge is 2 regardless of the number of regions. Only once (step S28 in FIG. 6 and step S38 in FIG. 7). That is, the speed of the touch panel can be increased by reducing the number of discharges. Further, the region where the first conductive film 2 and the second conductive film 4 are in contact is stored, and the Y coordinate is detected in the stored region (step S21 in FIG. 6 and step S33 in FIG. 7). Since it is not necessary to re-determine whether the first conductive film 2 and the second conductive film 4 are in contact with each other, the touch panel can be further increased in speed.

  Next, a modification of the first embodiment will be described. 8 and 9 are flowcharts illustrating the touch panel control according to the modification of the first embodiment.

  As shown in FIG. 8, steps S20, S1-3, and S21 are the same control as that shown in FIG. If No in step S20 or after step S21, the process proceeds to step S24. Steps S24 to S27 are also the same as those shown in FIG. In other words, the control shown in FIG. 8 is different from the control shown in FIG. 6 in that voltage application (step S22), X coordinate detection (step S23), and discharge (step S28) are not performed. If Yes in step S26, the process proceeds to step S29 in FIG. 9 (see “B” in the figure).

  As shown in FIG. 9, the controller 16 controls the electrode controller 18 to apply Vcc to the electrode 6 and Vss to the electrode 8 (step S29). After step S29, the control unit 16 sets the row number to m = 1 and the column number to n = 1 (step S30). After step S30, the same control as steps S31 and S32 shown in FIG. 7 is performed. In the case of Yes in step S32, the control unit 16 detects the X coordinate of the point where the first conductive film 2 and the second conductive film 4 are in contact (step S40).

  After step S40 or if No in step S32, the process proceeds to step S24. Steps S24 to S27 are the same as those shown in FIG. If Yes in step S26, the control unit 16 controls the electrode control unit 18 to discharge the voltages applied to the electrodes 6 and 8 (step S41). That is, after determining whether or not the first conductive film 2 and the second conductive film 4 are in contact with each other in each region Fmn as shown in FIG. 8, the control unit 16 determines the X coordinate in each region Fmn as shown in FIG. Is detected. After step S41, the process proceeds to step S29 in FIG. 7 (see “A” in the figure). After step S38 shown in FIG. 7, the control ends.

  According to the modification of the first embodiment, the discharge is performed after the X coordinate is detected in each of the regions Fmn, the Y coordinate is detected in each of the regions Fmn, and then the discharge is performed. For this reason, discharge is performed only twice regardless of the number of regions. Accordingly, it is possible to increase the speed of the touch panel. Further, according to the modification of the first embodiment, after a touch-on check is performed in each of the plurality of areas, the X coordinate is detected in each of the areas, and then the Y coordinate is detected. Therefore, it is not necessary to repeat the touch-on check and the detection of the X coordinate as in steps S3 to S23 in FIG. Therefore, the touch panel can be further increased in speed.

  In the first embodiment, the control for detecting the X coordinate before the Y coordinate has been described. However, the Y coordinate may be detected before the X coordinate. In other words, after detecting either the X coordinate or the Y coordinate, the voltage is removed, and then the other of the X coordinate or the Y coordinate is detected, so that the number of discharges can be reduced, and the touch panel speed can be increased. It becomes possible.

  As illustrated in FIGS. 1B and 1C, the example in which the first conductive film 2 is divided into 16 regions has been described. However, the first conductive film 2 may be divided into more regions or fewer regions. Further, the number of rows and the number of columns may be different. In FIG. 3, a plurality of regions are connected to one multiplexer and pull-down resistor for each row. However, the connection method is not limited to this, and may be, for example, for each column.

  Next, Example 2 will be described. FIG. 10A is a plan view illustrating a touch panel 200 according to the second embodiment. FIG. 10B is a plan view illustrating a touch panel 210 according to a modification of the second embodiment. FIG. 10B also shows an example of the vector direction described later. First, the example of FIG. 10A will be described.

  Even in a multi-point input type touch panel, a one-point input mode may be used. The touch panel 200 is a one-point input mode. In a touch panel, for example, in a state where the touch panel is touched with a finger or the like, drawing may be performed on the touch panel by sliding the finger or the like. In such a drawing mode, a high-speed touch panel is required in order to perform drawing smoothly. This point will be described with reference to FIG.

  As shown in FIG. 10A, the first conductive film 2 of the touch panel 200 is divided into regions F11 to F44. For example, when the area F22 is touched, a finger or the like moves from the area F22 in the drawing mode, and an area adjacent to the area F22 is also touched. At this time, if coordinate detection is sequentially performed from the area F11, the processing speed of the touch panel becomes slow with respect to movement of a finger or the like, and drawing may not be performed smoothly.

  In the touch panel 200 according to the second embodiment, when the first conductive film 2 and the second conductive film 4 are in contact with each other in the shaded region F22 in the drawing, the region F22 and the region adjacent to the region F22 are used in the next operation. In F11 to F13, F21, F23, and F31 to F33 (hatched areas in the figure), it is determined whether the first conductive film 2 and the second conductive film 4 are in contact with each other with priority over other areas. .

  Next, the operation of the touch panel 200 according to the second embodiment will be described in more detail with reference to a flowchart. 11 to 13 are flowcharts illustrating the control of the touch panel according to the second embodiment.

  Steps S1 to S3 and steps S24 to S27 shown in FIG. 11 are the same control. If No in step S3, the control proceeds to step S24. If Yes in step S26, the control ends. In the case of Yes in step S3, that is, when the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn, the control unit 16 contacts the first conductive film 2 and the second conductive film 4 in the region Fmn. The X coordinate and Y coordinate of the point are output (step S50). The output of the X coordinate and the Y coordinate is performed, for example, by the control of steps S4 to S9 shown in FIG.

  After step S50, the process proceeds to step S51 in FIG. 12 (see “C” in the figure). The controller 16 checks whether the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn, that is, the region determined to be touch-on in step S3 (step S51). After step S51, the control unit 16 determines whether or not the first conductive film 2 and the second conductive film 4 are in contact (step S52). In the case of Yes in step S52, the control unit 16 outputs the X coordinate and the Y coordinate of the point where the first conductive film 2 and the second conductive film 4 are in contact (step S53). That is, when the control unit 16 outputs the coordinates of the point where the first conductive film 2 and the second conductive film are in contact in step S50, the control unit 16 outputs a plurality of regions in the operation subsequent to the operation of outputting the coordinates (step S50). Among them, the touch ON check and the coordinate detection are performed in the region Fmn in which the coordinates are output in step S50. After step S53, control proceeds to step S76 in FIG. 14 (see “C1” in FIGS. 12 and 14). The control after proceeding to C1 will be described in a modification of Example 2 described later.

  In the case of No in step S52, the control unit 16 determines whether m is greater than 1 (step S54). In the case of No, the control unit 16 sets p = m (step S55). Note that No in step S54 is a case where it is determined in step S3 in FIG. 11 that the area in the first row is touch-on. In the case of Yes, the control unit 16 sets p = m−1 (step S56).

  After step S55 or S56, the controller 16 determines whether n is greater than 1 (step S57). In the case of No, the control unit 16 sets q = n (step S58). Note that No in step S57 is a case where it is determined in step S3 in FIG. 11 that the region in the first column is touch-on. In the case of Yes, the control unit 16 sets q = n−1 (step S59).

  After step S58 or S59, the control unit 16 determines whether m is smaller than MAX (step S60). Here, MAX is 4 which is the largest of the row numbers. In the case of No, the control unit 16 sets r = m (step S61). Note that No in step S60 is a case where it is determined in step S3 in FIG. 11 that the region in the fourth row is touch-on. In the case of Yes, the control unit 16 sets r = m + 1 (step S62).

  After step S61 or S62, the control unit 16 determines whether n is smaller than MAX (step S63). Here, MAX is 4 which is the largest of the column numbers. In the case of No in step S63, the control unit 16 sets s = n (step S64). Note that No in step S63 is a case where it is determined in step S3 in FIG. 11 that the region in the fourth column is touch-on. If Yes in step S63, the control unit 16 sets s = n + 1 (step S65). After step S65, control proceeds to step S66 in FIG. 13 (see “D” in the figure).

  The control unit 16 sets pp = p (step S66). That is, the control unit 16 stores the value of p set in step S55 or S56. After step S66, the control unit 16 determines whether p = m and q = n (step S67). In the case of No, the control unit 16 controls whether the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fpq, that is, the touch ON check (Step S68). After step S68, the control unit 16 determines whether or not the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fpq (step S69). That is, the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fpq adjacent to the region Fmn.

  In the case of Yes in step S69, the control unit 16 outputs the X coordinate and the Y coordinate of the point where the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fpq (step S70). That is, the control unit 16 outputs coordinates in the region Fpq adjacent to the region Fmn. After step S70, the control unit 16 sets m = p and n = q. After step S71, control returns to step S51 in FIG. 13 (see “C” in the figure). In other words, when the coordinates are output in the area Fpq adjacent to the area Fmn, the control unit 16 does not output the coordinates in the area other than the area Fpq.

  If Yes in step S67 or No in step S69, the control unit 16 determines whether p = r (step S72). In the case of No, the control unit 16 sets p = p + 1 (step S73). That is, the row of the region Fpq is set as the next row. After step S73, control returns to step S67. That is, the control unit 16 performs the control from step S67 onward for the area in the row immediately after the area Fpq in which it is determined in step S69 that the touch is ON.

  If Yes in step S72, the control unit 16 determines whether q = s (step S74). In the case of No, the control unit 16 sets p = pp and q = q + 1 (step S75). Here, pp is the row number p of the region Fpq in which it is determined in step S69 that the touch is ON (see steps S66 and S69).

  After step S75, control returns to step S67. In other words, the control unit 16 performs the control in and after step S67 for the region Fpq located in the next row and in the same row as the region in which the touch is determined to be ON in step S69. The above control is repeated, and if Yes in step S74, the control ends. That is, after the touch-on check is performed on the area adjacent to the area Fmn where the coordinates are output in step S50 in FIG. 11, the control ends.

  The above control will be specifically described with reference to FIG. For example, when the coordinates are output in the region F22 (step S50 in FIG. 11), the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each other in the region F11 (steps S68 and S68 in FIG. 13). S69). In the case of Yes in step S69, the coordinates are output in the area F11, and the control returns to the control in FIG. In No, the control part 16 performs control after step S67 about the area | region F21 (step S72 and S73). After Steps S67 to S73 are repeated and the area F33 is controlled, the control is finished. That is, the control unit 16 performs control to detect coordinates for the region F22 and the region adjacent to the region F22, and does not perform control to detect coordinates for other regions.

  According to the second embodiment, when coordinates are output in the region Fmn (step S50 in FIG. 11), in the next operation (step S51 and subsequent steps in FIG. 12), the control unit 16 is the region in which the coordinates are output. In the region Fpq adjacent to Fmn, the coordinates of the point where the first conductive film 2 and the second conductive film 4 are in contact are detected (steps S68 to S70 in FIG. 13). When the coordinates are output in the area Fmn (step S50 in FIG. 11), the control unit 16 does not perform the touch-on check in the area other than the area Fmn and the area Fpq adjacent to the Fmn (step S72 in FIG. 13). S74). That is, the control unit 16 does not detect coordinates in the regions other than the region Fmn adjacent to the regions Fmn and Fmn among the plurality of regions. Further, when coordinates are output in the region Fpq (Yes in step S69), coordinates are not detected for regions other than the region that has already undergone the touch-on check among the regions Fmn and Fmn. That is, the touch panel 200 is a one-point input type touch panel.

  As described above, in order to detect the coordinates of the area Fmn where the coordinates have been previously detected and the adjacent areas with priority over other areas, the coordinates are sequentially detected for all the divided areas. The speed of the touch panel can be increased. In addition, when the coordinates are detected, the coordinates are not detected for the areas other than the areas where the touch-on check has already been performed. As a result, the speed of the touch panel can be increased, and the drawing can be quickly performed even in the drawing mode. Further, the touch panel 200 according to the second embodiment can cope with finer drawing.

  Next, a modification of the second embodiment will be described. As shown in FIG. 10B, for example, the first conductive film 2 and the second conductive film 4 are in contact with each other in a region F22 indicated by shading in the figure, and then, for example, a finger or the like pressing the touch panel slides. Consider the case where the first conductive film 2 and the second conductive film 4 are in contact with each other in the region adjacent to the region F22. In the touch panel 210 according to the modification of the second embodiment, for example, when pressing is performed while sliding in the direction from the region F22 to the region F13, in the next operation, the region F22 and the direction from the region F22 toward the region F13 are aligned. It is determined whether or not the first conductive film 2 and the second conductive film 4 are in contact with each other in the regions, that is, the regions F12, F13, and F23 indicated by oblique lines in the drawing.

  Next, the control of the touch panel according to the modification of the second embodiment will be described in more detail with reference to a flowchart. 14 to 22 are flowcharts illustrating the touch panel control according to the modification of the second embodiment. The control shown in FIG. 11 is also performed for a modification of the second embodiment.

  As shown in FIGS. 14 and 12, control proceeds to step S76 in FIG. 14 after step S53 in FIG. 12 (see “C1” in the figure). The control unit 16 detects a vector from the region Fmn toward the region where the coordinates adjacent to Fmn are output (step S76). In other words, the control unit 16 determines the direction based on the operation of outputting the coordinates in the region Fmn and the adjacent region.

  After step S76, the control unit 16 determines whether the direction of the vector determined in step S76 is 0 ° to 90 ° (step S77). In the case of Yes, the process proceeds to step S80 in FIG. 15 (see “E” in the figure).

  In No, the control part 16 judges whether the direction of the vector defined in step S76 is 90 degrees-180 degrees (step S78). In the case of Yes, it progresses to step S80 of FIG. 17 (refer "F" in a figure).

  In the case of No, the control unit 16 determines whether the direction of the vector determined in step S76 is 180 ° to 270 ° (step S79). In the case of Yes, the process proceeds to step S80 in FIG. 19 (see “G” in the figure).

  In the case of No, the control unit 16 determines that the vector direction determined in step S76 is 270 ° to 360 °, and proceeds to step S80 in FIG. 21 (see “H” in the drawing).

  Next, a case where the vector direction is 0 ° to 90 ° will be described. FIGS. 15 and 16 are flowcharts illustrating the control when the vector direction is 0 ° to 90 °.

  As shown in FIG. 15, the control unit 16 performs a touch-on check in the region Fmn where the coordinates are output in step S50 of FIG. 11 (step S80). After step S81, the control unit 16 determines whether the touch is ON in the region Fmn. In the case of Yes, the control part 16 outputs X coordinate and Y coordinate (step S82). After step S82, control returns to step S66 in FIG. 13 (see “D” in the figure).

  In the case of No in step S81, the control unit 16 determines whether m is greater than 1 (step S83). In the case of No, that is, when the region Fmn is a region located in the first row, the control unit 16 determines whether n is smaller than MAX (step S84). In the case of Yes, the process proceeds to step S94 in FIG. 16 described later (see “J” in the figure). In the case of No, that is, when the region Fmn is a region located in the fourth column, the control ends (see “K” in the drawing and FIG. 16).

  If Yes in step S83, the control unit 16 performs a touch ON check in the region Fm-1n (step S85). That is, the control unit 16 performs a touch-on check in an area located in the row immediately before the area Fmn. After step S85, the control unit 16 determines whether the touch is ON in the region Fm-1n (step S86).

  In the case of Yes, the control part 16 outputs X coordinate and Y coordinate (step S87). After step S87, the control unit 16 sets m = m−1 (step S88). After step S88, control returns to step S66 in FIG. 13 (see “D” in the figure). If No in step S86, control proceeds to step S89 in FIG. 16 (see “I” in the figure).

  As shown in FIG. 16, in the case of No in step S86, the control unit 16 determines whether n <MAX (step S89). If No, the control ends. In the case of Yes, the control part 16 performs a touch ON check in area | region Fm-1n + 1 (step S90). That is, the control unit 16 performs a touch-on check in an area located in a row before the area Fmn and a column after the area Fmn. The control unit 16 determines whether the touch is ON in the region Fm−1n + 1 (step S91).

  In the case of Yes, the control part 16 outputs X coordinate and Y coordinate (step S92). After step S92, the control unit 16 sets m = m−1 and n = n + 1 (step S93). After step S93, control returns to step S76 in FIG. 14 (see “C1” in the figure).

  In the case of No in step S91, the control unit 16 performs a touch ON check in the area Fmn + 1 (step S94). Also, in the case of Yes in step S84 in FIG. 15, the control unit 16 performs the control in step S94. That is, the control unit 16 performs a touch-on check in an area located in the next row after the area Fmn. After step S94, the control unit 16 determines whether the touch is ON in the region Fmn + 1 (step S95).

  In the case of Yes, the control part 16 outputs X coordinate and Y coordinate (step S96). After step S96, the control unit 16 sets n = n + 1 (step S97). After step S97, control returns to step S76 in FIG. 14 (see “C1” in the figure). If No in step S95, the control ends.

  Next, a case where the vector direction is 90 ° to 180 ° will be described. 17 and 18 are flowcharts illustrating the control when the vector direction is 90 ° to 180 °. Description of the same control as that shown in FIGS. 15 and 16 is omitted.

  In the case of No in step S83 in FIG. 17, the control unit 16 determines whether n is smaller than 1 (step S98). In the case of Yes, the process proceeds to step S105 of FIG. 18 described later (see “L” in the figure). In the case of No, the control ends (see “M” in the figure and FIG. 18).

  If Yes in step S83, the control unit 16 performs a touch ON check in the area Fm-1n (step S99), and determines whether the touch is ON in the area Fm-1n (step S100). That is, the control unit 16 performs a touch-on check in an area located in the row immediately before the area Fmn. In the case of Yes, steps S87 and S88 are performed, and the control returns to step S76 in FIG. 14 (see “C1” in the figure). In the case of No, the control proceeds to step S101 in FIG. 8 (see “N” in the figure).

  As shown in FIG. 18, after step S100, the control unit 16 determines whether n is greater than 1 (step S101). If No, the control ends. In the case of Yes, the control unit 16 performs a touch ON check in the area Fm-1n-1 (Step S102), and determines whether the touch is ON in the area Fm-1n-1 (Step S103). In other words, the control unit 16 performs a touch-on check in the area located in the previous row and the previous column from the area Fmn.

  If Yes in step S103, the control unit 16 outputs coordinates (step S92), and sets m = m−1 and n = n−1 (step S104). Thereafter, the control returns to step S76 in FIG. 14 (see “C1” in the figure).

  In the case of No in step S103, the control unit 16 performs a touch ON check in the area Fmn-1 (step S105), and determines whether the touch is ON in the area Fmn-1 (step S106). In other words, the control unit 16 performs a touch-on check in an area located in the previous row from the area Fmn. Specifically, when coordinates are output in, for example, the region F22 in step S50 of FIG. 11, a touch ON check is performed in the region F21 in step S105. If Yes in step S106, the control unit 16 outputs the coordinates (step S96) and sets n = n-1 (step S107). If No in step S106, the control ends.

  Next, the case where the vector direction is 180 ° to 270 ° will be described. 19 and 20 are flowcharts illustrating the control when the vector direction is 180 ° to 270 °. A description of the same control as that described above will be omitted.

  As shown in FIGS. 19 and 20, when the vector direction is 180 ° to 270 °, the control unit 16 is Fm + 1n, which is an area located in a row immediately after the area Fmn (step S109 in FIG. 19). A touch-on check is performed in Fm + 1n−1 (step S112 in FIG. 20) that is an area located in the next row and the previous column, and in Fmn−1 that is an area located in the previous column. (Step S105 in FIG. 20).

  Next, a case where the vector direction is 270 ° to 360 ° will be described. FIGS. 21 and 22 are flowcharts illustrating the control when the vector direction is 270 ° to 360 °. A description of the same control as that described above will be omitted.

  As shown in FIGS. 21 and 22, when the vector direction is 270 ° to 360 °, the control unit 16 is Fm + 1n, which is an area located in a row immediately after the area Fmn (step S109 in FIG. 21). Touch ON check is performed in Fm + 1n + 1 (step S112 in FIG. 22) which is an area located in the next row and the next column (step S112 in FIG. 22) and in Fmn + 1 which is an area located in the next column (FIG. 22). Step S105).

  The above control will be specifically described with reference to FIG. For example, when coordinates are output in the region F22 (step S50 in FIG. 11) and coordinates are output in the region F33 (step S70 in FIG. 13), the control unit 16 calculates a direction based on the operation that outputs the coordinates. (Step S76 in FIG. 14). Here, the direction is 270 ° to 360 ° (No in step S79). The control unit 16 determines whether or not the first conductive film 2 and the second conductive film 4 are in contact with each other in the region F22 (Steps S80 and S81 in FIG. 21). In the case of Yes, the coordinates are output in the region F22, and the process returns to step S76 in FIG. In the case of No, a touch-on check is performed in the regions F32, F33, and F23 (step S109 in FIG. 22 and steps S112 and S95 in FIG. 22). If No in step S95, the control ends. That is, the control unit 16 performs control to detect coordinates in the region F22 and a region along the direction of 270 ° to 360 ° from the region F22, and does not perform control to detect coordinates in other regions.

  According to the modified example of the second embodiment, when coordinates are output in the region Fmn (step S50 in FIG. 11), in the next operation (after step S51 in FIG. 12), the control unit 16 is based on the operation in FIG. Coordinates are detected in a region along a predetermined direction. For this reason, the touch panel can be speeded up. In particular, when the touch panel is slid and pressed, for example, in the drawing input mode, it is possible to draw quickly in response to the input.

  In the example of FIG. 10B, the vector directions are four directions along the side direction of the touch panel 210, but the present invention is not limited to this. That is, there may be fewer than four directions or more directions. Further, the direction may not be along the side of the touch panel. In the second embodiment and the modified example of the second embodiment, coordinates are detected in a region adjacent to the region Fmn, but the present invention is not limited to this. For example, it may be an area around 2 rows and / or 2 columns of the area Fmn, an area around 3 rows or / and 3 columns. That is, it is possible to increase the speed of the touch panel by detecting the coordinates of the area around the area Fmn.

  Next, Example 3 will be described. First, a touch panel provided with lead-out wiring will be described. FIG. 23A is a plan view illustrating a touch panel 300 including a lead wiring, and FIG. 23B is an enlarged view illustrating a lead wiring portion (see the dotted line portion in FIG. 23A).

  As shown in FIGS. 23A and 23B, the first conductive film 2 is divided into a plurality of regions, and each of the regions includes a wiring 41 for connecting to a pull-down resistor. The wiring 41 is provided along the upper side and the lower side of the touch panel. For this reason, among the plurality of regions, the regions F21 to F24 and the regions F31 to F34 each have a lead-out wiring led out in the column direction. That is, as shown in FIG. 23B, for example, the region F31 (first region) includes a main region F31a and a lead-out wiring F31b. The lead wiring F31b is formed adjacent to the region F41. In other words, the lead-out wiring F31b is formed between the regions F41 and F42. On the other hand, since the region F41 (second region) is in contact with the lower side of the touch panel, no lead wiring is provided. Note that the lead-out wirings of the regions F21 to F24 are led out to the upper side of the touch panel, and the regions F11 to F14 are not provided with the lead-out wiring.

  Since the width of the lead-out wiring F31b is smaller than the width of the main region F31a, the resistance of the lead-out wiring F31b is higher than the resistance of the main region F31a. For this reason, the resistance of the region F31 is higher than the resistance of the region F41. As a result, there is a difference in potential applied to the pull-down resistor between the region F31 and the region F41. In order to correct the potential difference, for example, the value transmitted from the region F31 and the signal transmitted from the region F41 may be set to the same potential by changing the value of the pull-down resistor. Further, as a correction method, an offset voltage may be added to the signal transmitted from the region F31. Furthermore, in order to remove noise generated in the signal transmitted from the region F31, the filter shielding frequency may be different depending on whether the filter is connected to the region F31 or the region F41. Specifically, when connecting to the region F31, the pass band of the filter is set to the lower frequency side than when connecting to the region F41.

  However, as the number of pull-down resistance values and filter shielding frequency changes increases, the operation of the touch panel may be delayed accordingly. In particular, the filter requires a certain time after the change of the shielding frequency until the operation is stabilized. Accordingly, if the operation of sequentially detecting the coordinates for a plurality of areas is performed, the operation of the touch panel may be delayed.

  Next, the touch panel of the touch panel according to the third embodiment will be described. In the touch panel according to the third embodiment, a plurality of regions are grouped for each row, and coordinate detection is also controlled for each group. That is, the main regions of the regions F21 to F24 and the main regions of the regions F31 to F34 form a group (first group). The lead lines for the regions F11 to F14 and the regions F21 to F24 and the lead wires for the regions F41 to F44 and the regions F31 to F34 form a group (second group).

  Next, the area selection unit and the filter unit of the touch panel according to the third embodiment will be described. FIG. 24 is a block diagram illustrating a region selection unit and a filter unit of the touch panel according to the third embodiment (see FIG. 2).

  As shown in FIG. 24, the region selection unit 20 includes a plurality of multiplexers 30, 32, 34 and 36. The filter unit 22 includes a plurality of filters 42, 44, 46 and 48. Each of the filters 42 to 48 is a low-pass filter.

  The regions F11 to F44 form a group for each row, and each of the plurality of groups is connected to each of the plurality of multiplexers 30 to 36. Each of the multiplexers 30 to 36 is connected to each of the filters 42 to 48. The multiplexer receives a signal transmitted by each region and a select signal transmitted by the control unit 16 (see FIG. 2). The multiplexer 30 can select a signal of a region for detecting coordinates from signals transmitted from the regions F11 to F14 by a select signal. The same applies to the multiplexers 32-36. That is, the region selection unit 20 can select a region from a group grouped for each row.

  Further, the filters 44 and 46 connected to the first group have a lower pass band than the filters 42 and 48 connected to the second group. That is, the first group and the second group are connected to a plurality of filters having different shielding frequencies.

  Next, control of the touch panel according to the third embodiment will be described. FIG. 25 is a flowchart illustrating the control of the touch panel according to the third embodiment.

  As shown in FIG. 25, first, the control unit 16 performs a touch-on check on the first line (step S120). After step S120, the control unit 16 detects the X coordinate and the Y coordinate in each area of the first row (step S121). That is, the control unit 16 performs the control of steps S4 to S9 shown in FIG.

  After step S121, the control unit 16 performs a touch-on check on the second line (step S122). After step S122, the control unit 16 detects the X coordinate and the Y coordinate in each area of the second row (step S123). After step S123, the same control is performed for the third and fourth lines (steps S124 to S127), and the control ends.

  According to the third embodiment, the plurality of regions are grouped into a group including the lead wiring and a group not including the lead wiring, and each group is connected to a filter having a different shielding band. The control part 16 detects a coordinate for every said group. Therefore, it is not necessary to correct the potential difference for each region, and it is not necessary to change the shielding frequency of the filter, so that the speed of the touch panel can be increased.

  As shown in FIG. 24, in Example 3, each group is connected to a different filter, but the configuration is not limited to this. For example, as shown in FIG. 23A, since the regions F21 to F24 and the regions F31 to F34 are all provided with lead-out wiring, the resistance becomes high. Accordingly, the regions F21 to F34 may be connected to the same filter. Moreover, you may connect the area | regions F11-F14 and the area | regions F41-F44 which are not provided with the drawing-out wiring to the same filter. Thereby, since the number of filters can be reduced, it is possible to reduce the size and cost of the touch panel. As shown in FIG. 23A, in the third embodiment, the lead-out wiring is led out in the column direction. However, the lead-out wiring may be led out in the row direction. Further, the lead wiring may be drawn in a direction other than the matrix.

  Next, Example 4 will be described. Also in Example 4, for example, as shown in FIG. 23A, the first conductive film 2 is divided into a plurality of regions, and among the regions, the regions F21 to F24 and the regions F31 to F34 are each in the column direction. The lead-out wiring led out is provided. The regions F11 to F44 are grouped for each row. That is, the main regions of the regions F21 to F24 and the main regions of the regions F31 to F34 form a group (first group). The lead lines for the regions F11 to F14 and the regions F21 to F24 and the lead wires for the regions F41 to F44 and the regions F31 to F34 form a group (second group).

  Next, the configuration of the area selection unit according to the fourth embodiment will be described. FIG. 26A to FIG. 26C are diagrams illustrating the area selection unit according to the fourth embodiment. In each figure, the part which concerns on the area | regions F11-F14 among the area | region selection parts 20 is shown in figure.

  As shown in FIG. 26A, the multiplexer 30 of the region selection unit 20 is connected to the regions F11 to F14. That is, the areas are grouped for each row and connected to one multiplexer. Further, the multiplexer 30 receives a signal transmitted from the regions F11 to F14 and a select signal transmitted from the control unit 16 in response to the contact between the first conductive film 2 and the second conductive film 4. A signal transmitted from each of the regions F <b> 11 to F <b> 14 is input to each of the plurality of diodes 50. The output sides of the plurality of diodes 50 are combined into one wiring by the node 51. In other words, the node 51 combines the signals transmitted from the regions F11 to F14 in response to the contact between the first conductive film 2 and the second conductive film 4 as one signal (hereinafter “binding signal”). Function as. The diode 50 prevents a signal on the output side from flowing backward to the input side. For example, the diode 50 prevents the signal transmitted from the region F11 from flowing backward and flowing to the wiring connected to the regions F12 to F14. The signals transmitted from the regions F11 to F14 are input to the filter unit 22 via the diode 50 and further input to the control unit 16 (see FIG. 2).

  The control part 16 can detect that the 1st electrically conductive film 2 and the 2nd electrically conductive film 4 contacted in either of the area | regions F11-F14 by receiving a binding signal. In other words, the control unit 16 determines that the first conductive film 2 and the second conductive film 4 are in contact with each other in the group including the regions F11 to F14 in response to receiving the binding signal.

  The regions F21 to F24, the regions F31 to F34, and the regions F41 to F44 are also grouped and connected to different multiplexers and filters, respectively.

  Next, control of the touch panel according to the fourth embodiment will be described. FIG. 27 is a flowchart illustrating the control of the touch panel according to the fourth embodiment.

  As shown in FIG. 27, the control unit 16 sets m = 1 (step S130). After step S130, the control unit 16 performs a touch ON check in the m-th column (step S131). After step S131, the control unit 16 determines whether the touch is ON in the m-th column (step S132). That is, the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each of the plurality of groups. In No, control progresses to step S139 mentioned later.

  In the case of Yes, the control unit 16 sets n = 1 (step S133). After step S133, the control unit 16 performs a touch ON check in the area Fmn (step S134), and determines whether the touch is ON in the area Fmn (step S135).

  In the case of Yes, the control part 16 detects a coordinate in the area | region Fmn (step S136). After step S136 or in the case of No in step S135, the control unit 16 determines whether n = MAX (step S137). In the case of Yes, the control unit 16 sets n = n + 1 (step S138), and the control returns to step S134. That is, the control in steps S134 to S136 is performed in the area of the next row among the areas belonging to the m-th column for which it is determined in step S132 that the touch is ON.

  In the case of No in step S137, the control unit 16 determines whether m = MAX (step S139). In the case of Yes, the control unit 16 sets m = m + 1 (step S140), and the control returns to step S131. That is, the control in steps S131 to S139 is performed in the next row from the row in which it is determined in step S132 that the touch is ON. If Yes in step S139, the control ends.

  According to the fourth embodiment, the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each other in a plurality of groups (in the case of Yes in steps S131 and S132 in FIG. 27). In the contacted group, an operation of detecting coordinates is performed (step S134). Moreover, the control part 16 does not perform the operation | movement which detects a coordinate in the group in which the 1st electrically conductive film 2 and the 2nd electrically conductive film 4 are not contacting (in the case of No in step S132). For this reason, the number of times of control of touch ON check and coordinate detection is smaller than in the case of sequentially controlling each area. Accordingly, it is possible to increase the speed of the touch panel.

  In particular, as shown in FIGS. 23A and 23B, when lead-out wiring is formed, a plurality of regions are grouped into a group including the lead-out wiring and a group not including the lead-out wiring, and each group is grouped. It is possible to connect to filters having different shielding frequencies. Thereby, since it is not necessary to correct | amend an electric potential difference for every area | region and it is not necessary to change the shielding frequency of a filter, the further speed-up of a touch panel is attained.

  In addition, the node 51 combines signals transmitted from each of the regions constituting the group as one signal, and the control unit 16 responds to the first conduction in the group in response to the transmission of the combined signal. It is determined that the film 2 and the second conductive film 4 are in contact with each other. Accordingly, with a simple configuration, it is possible to automatically determine the group in which the first conductive film 2 and the second conductive film 4 are in contact with each other, and to perform an operation of detecting coordinates.

  In the fourth embodiment, the example in which a plurality of regions are grouped into rows is described. However, the group example is not limited to this. For example, it is good also as a group for every row | line | column. That is, each of the plurality of groups includes a part of the plurality of regions. Further, although the plurality of regions are grouped into a group including the lead wiring and a group not including the lead wiring, the present invention is not limited to this.

  Next, a modification of the fourth embodiment will be described. FIG. 26B and FIG. 26C are diagrams illustrating a region selection unit according to a modification of the fourth embodiment.

  As shown in FIG. 26B, a semiconductor switch 52 may be used instead of the diode 50. In this case, a control signal is input from the control unit 16 to the semiconductor switch 52.

  As shown in FIG. 26 (c), an electromagnetic switch 54 may be used instead of the diode 50. Also in this case, a control signal is input from the control unit 16 to the electromagnetic switch 54.

  Next, Example 5 will be described. FIG. 28A is an enlarged view illustrating the lead-out wiring portion of the touch panel according to the fifth embodiment (see the dotted line portion in FIG. 23A).

  As shown in FIG. 28A, the region F31 includes a main region F31a and a lead-out wiring F31b. The lead wiring F31b is located between the region F41 and the region F42.

  Here, consider the case where the first conductive film 2 and the second conductive film 4 are in contact with each other in the regions F41 and F42 and the lead-out wiring F31b, as indicated by the oblique lines in the figure. This is a case where, for example, a finger or the like touches a portion of the first conductive film 2 that extends over the region F41, the lead-out wiring F31b, and the region F42. At this time, even if the user intends to input one point, it may be determined that there is an input at three points. Therefore, it is determined that there is an input in the area F31, and the touch panel may malfunction.

  The touch panel according to the fifth embodiment determines that one point has been input when the difference in coordinates in each region is within a predetermined range, and outputs the coordinates. This will be described in detail with reference to a flowchart. FIG. 29 is a flowchart illustrating control of the touch panel according to the fifth embodiment.

  As shown in FIG. 29, first, the control unit 16 (see FIG. 2) performs a touch ON check in the area Fmn (step S141), and determines whether the touch is ON in the area Fmn (step S142). That is, the control unit 16 determines whether the first conductive film 2 and the second conductive film 4 are in contact with each other for a plurality of regions.

  In the case of Yes, the control unit 16 detects the X coordinate and the Y coordinate of the point where the first conductive film 2 and the second conductive film 4 are in contact with each other in the region Fmn (step S143). After step S143, the control unit 16 determines whether the detected plurality of X coordinates and Y coordinates are within a predetermined range (step S144). In the case of Yes, the control part 16 detects a coordinate based on the coordinate judged in step 144 whether it exists in the predetermined range, and outputs the detected coordinate (step S145). After step S145, or in the case of No in step S142 and in the case of No in step S144, the control ends.

  The control in steps S144 and S145 will be specifically described with reference to the example of FIG. The X coordinate and the Y coordinate (first coordinate) detected in the region F41 (third region) are respectively referred to as X (F41) and Y (F41). Similarly, the coordinates (second coordinates) detected in the area F42 (fourth area) are X (F42) and Y (F42). Further, the coordinates (third coordinates) detected in the lead-out wiring F31b in the region F31 (fifth region) are X (F31b) and Y (F31b).

  If the predetermined range in step S144 is α, the control unit 16 | X (F41) −X (F42) | <α, | X (F42) −X (F31b) | <α, | Y (F41) −Y It is determined whether (F42) | <α and | Y (F42) −Y (F31b) | <α (step S144). When the detected coordinates satisfy the above relationship, the control unit 16 determines that an input is made at one point, and based on X (F41), X (F31b), and X (F42), the X coordinate (fourth Coordinate). In addition, the control unit 16 outputs a Y coordinate (fourth coordinate) based on Y (F41), Y (F31b), and Y (F42) (step S145). That is, the control unit 16 outputs one coordinate based on the detected three coordinates.

  According to the fifth embodiment, even when coordinates are detected in a plurality of regions including the lead wiring, coordinates determined based on the detected coordinates are output. Therefore, the accuracy of coordinate detection of the touch panel is improved. In particular, the input at the lead-out wiring is ignored, and it is determined that there is an input at one point, so that malfunction can be suppressed.

  In step S145, the control unit 16 outputs, for example, average coordinates of the coordinates detected in the region F41 and the coordinates detected in the region F42. Further, the control unit 16 may output coordinates other than the average. In addition, although the predetermined range is described as α for both the X coordinate and the Y coordinate, the predetermined range may be different for the X coordinate and the Y coordinate.

  Next, a modification of the fifth embodiment will be described. FIG. 28B is an enlarged view illustrating the lead-out wiring portion of the touch panel according to the modification of the fifth embodiment (see the dotted line portion in FIG. 23A).

  As shown by shading in FIG. 28B, in addition to the lead lines F31b in the regions F41 and F42 and the region F31 described in FIG. Consider the case where the second conductive film 4 comes into contact. In this case, as indicated by the black dots in the figure, the average coordinates of the coordinates detected in the hatched area and the shaded area may be output. In this case, the coordinates of the points actually input in the shaded area are not output. Therefore, it is determined that an input unintended by the user has been made, and the touch panel may malfunction. In the modification of the fifth embodiment, the coordinates of the point where the input is actually performed are output. This will be described in more detail with reference to the flowchart shown in FIG. 29 and the example of FIG.

  Since steps S141 and S142 in FIG. 29 have already been described, description thereof will be omitted. After step S142, the control unit 16 performs the first operation in X (F41), Y (F41), X (F42), Y (F42), X (F31b), Y (F31b), and the main region F31a of the region F31. X (F31a) and Y (F31a) (fifth coordinate) that are the coordinates of the point where the conductive film 2 and the second conductive film 4 are in contact are detected (step S143).

  After step S143, the control unit 16 determines whether the detected plurality of X coordinates and Y coordinates are within a predetermined range (step S144). In the case of Yes, as described with reference to FIGS. 28A and 29, the control unit 16 detects one coordinate based on the coordinates detected in the lead-out wiring F31b of the regions F41, F42 and F31. The detected X coordinate and Y coordinate are X (F41, F42) and Y (F41, F42), respectively. Further, the control unit 16 detects the coordinates x and y (sixth coordinates) of the black point in FIG. x is an average of X (F31a) and X (F41, F42), and y is an average of Y (F31a) and Y (F41, F42).

  Further, the control unit 16 converts X (F31a) and Y (F31a), which are the coordinates of the actual contact point between the first conductive film 2 and the second conductive film 4 in the main region F31a, to X (F41, F42), Detection is based on x, Y (F41, F42) and y, and output (step S145). Specifically, X (F41a) = 2x−X (F41, F42) and Y (F41a) = 2y−Y (F41, F42). After step S145, the control ends.

  According to the modification of the fifth embodiment, as shown in FIG. 28 (b), even when coordinates are detected at two locations, the coordinates of the points actually inputted can be output. Therefore, the accuracy of coordinate detection of the touch panel is improved, and malfunctions can be suppressed.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

First conductive film 2
Second conductive film 4
Electrode 6, 8, 10, 12
Control unit 16
Electrode controller 18
Area selection unit 20
Filter unit 22
Multiplexer 30, 32, 34, 36
Pull-down resistor 40
Filter 42, 44, 46, 48
Diode 50
Node 51
Touch panel 100, 200, 210, 300

Claims (11)

A first conductive film divided into a plurality of regions that are insulated from each other;
A second conductive film facing and spaced apart from the first conductive film;
Of each of the plurality of regions, each of the first group including a main region of the first region, and each of the first group including the lead wiring of the first region and the second group including the second region of the plurality of regions. A control unit for detecting coordinates of a point where the conductive film and the second conductive film are in contact with each other;
The control unit determines whether the first conductive film and the second conductive film are in contact with each of a plurality of the first group and the second group,
Detecting coordinates of a point where the first conductive film and the second conductive film are in contact with each other in a group where the first conductive film and the second conductive film are in contact among the plurality of first groups and the second group. Perform the action to
A touch panel that does not perform the operation of detecting the coordinates in a group in which the first conductive film and the second conductive film are not in contact among the plurality of first groups and second groups . The first group and the second group are groups in which the plurality of regions are grouped together in either row or column,
The touch panel as set forth in claim 1, wherein the lead-out wiring is led out in the other direction of the row or the column. The touch panel according to claim 1, further comprising a plurality of filters connected to each of the first group and the second group and having different shielding frequencies. In response to the contact between the first conductive film and the second conductive film, one signal is transmitted from each of the main regions of the plurality of first regions constituting each of the plurality of first groups. Coupling means for coupling the signals transmitted from each of the plurality of first regions and the plurality of second regions as another signal, coupled as a signal, and constituting each of the plurality of second groups With
In response to receiving the one signal or the other signal combined by the combining means, the control unit receives the first conductive film and the second conductive film in the first group or the second group. The touch panel as described in any one of Claim 1 to 3 which judges that the film | membrane contacted. The control unit includes the first conductive layer in a third region, a fourth region, and a fifth region lead-out wiring located between the third region and the fourth region among the plurality of regions. A film and the second conductive film are in contact with each other,
The first coordinate which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other in the third region, and the first conductive film and the second conductive film are in contact with each other in the fourth region. The difference from the second coordinate, which is the coordinate of the point
And the difference between the first coordinate and the third coordinate which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other in the lead wiring of the fifth region is within a predetermined range. If it is,
The touch panel as described in any one of Claim 1 to 4 which outputs a 4th coordinate based on a said 1st coordinate and a said 2nd coordinate. The touch panel according to claim 5 , wherein the control unit outputs an average coordinate of the first coordinate and the second coordinate as the fourth coordinate. Based on the fifth coordinate, which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other in the main region of the fifth region, and the fourth coordinate, Detect the coordinates of
The touch panel according to claim 5 or 6 , wherein the fifth coordinate is output based on the fourth coordinate and the sixth coordinate. The touch panel according to claim 7 , wherein the control unit uses an average coordinate of the fourth coordinate and the fifth coordinate as a sixth coordinate. The operation of detecting the coordinates of the point where the first conductive film divided into a plurality of regions insulated from each other and the second conductive film facing and spaced apart from the first conductive film is in contact with the plurality of regions. A step performed in a first group including a main area of the first area;
Performing the operation of detecting the coordinates in the second group consisting of the lead wiring of the first region and the second region of the plurality of regions;
Determining whether the first conductive film and the second conductive film are in contact with each other for each of the plurality of the first group and the second group;
Detecting coordinates of a point where the first conductive film and the second conductive film are in contact with each other in a group where the first conductive film and the second conductive film are in contact among the plurality of first groups and the second group. Performing an operation to perform,
The touch panel coordinate detection method which does not perform the operation | movement which detects the said coordinate in the group in which the said 1st conductive film and the said 2nd conductive film do not contact among these 1st groups and 2nd groups . Of the plurality of regions, the first conductive film and the second conductive film are a third region, a fourth region, and a fifth region located between the third region and the fourth region. In case of contact with the lead-out wiring,
The first coordinate which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other in the third region, and the first conductive film and the second conductive film are in contact with each other in the fourth region. The difference from the second coordinate, which is the coordinate of the point
And the difference between the first coordinate and the third coordinate which is the coordinate of the point where the first conductive film and the second conductive film are in contact with each other in the lead wiring of the fifth region is within a predetermined range. A step of determining whether or not
When the difference between the first coordinate and the second coordinate and the difference between the first coordinate and the third coordinate are within the predetermined range, the first coordinate and the second coordinate The touch panel coordinate detection method according to claim 9 , further comprising: outputting a fourth coordinate based on the coordinate. Outputting coordinates of a point where a first conductive film divided into a plurality of regions insulated from each other and a second conductive film facing and spaced apart from the first conductive film are in contact with each other;
After the outputting step, the coordinates of the point where the first conductive film and the second conductive film are in contact with each other in the region where the coordinates are output in the outputting step and the region around the region where the coordinates are output. Detecting, and
If the coordinates are output in the step of outputting the coordinates, the coordinates are not detected in the areas other than the peripheral area, and the area where the coordinates are detected in the step of detecting the coordinates among the plurality of areas. Touch panel coordinate detection method.

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