JP2015152995A - Touch panel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel device that is provided with a contraction image area where an entire display screen is displayed with the entire display screen contracted, and is operated as if the entire display screen is allowed to be touched by touching a part of the contraction image area.SOLUTION: A touch panel device including a tabular touch panel main body with the touch panel main body overlapped on a display unit has means that contracts an image to be displayed in an entire screen of the display unit to display the contracted image in a contraction image area of one part of the display unit. Touch location detection means has: a circuit that discriminates a touch location to the contraction image area from a touch location to an area other than the contraction image area to detect the touch locations thereto; and a touch location coordinate conversion circuit that enlarges a coordinate of the touch location to the contraction image area to a coordinate of the entire screen. Display control means is configured to cause the display unit to correspond to the touch location and be operated.

Description

  The present invention relates to an input method and a driving method of a capacitive touch panel device.

  In recent years, a display device in which a capacitive touch panel, which is one of input devices, is bonded to a display panel such as a liquid crystal panel or an organic EL panel has been used as a two-dimensional coordinate input means in the field of personal computers and portable information terminals. Widely used.

  This touch panel device is a two-dimensional coordinate input in which a touch surface on which a touch operation is performed by an indicator such as an operator's finger is formed on the surface side of a flat touch panel body on which electrodes are arranged. Means.

  The wiring of the capacitive touch panel sensor part is mainly ITO wiring which is a transparent electrode or copper wiring. In patent document 1, the transparency of copper wiring is improved so that the image of a display part can be identified by forming the electrode wire comprised by the copper-like copper wiring of copper or a copper alloy. Since this copper wiring is suitable for enlargement, a capacitive touch panel can be realized even in a display device exceeding 50 inches.

JP 2006-344163 A

  In the case of a large display device provided with a capacitive touch panel device, it is assumed that it is installed in a large auditorium or hall, but it is desirable to install it at a high position to attract more attention. However, if the display screen is large and installed at a high position, it is difficult for the operator to touch the entire area with a finger even if the surface of the display unit is a touch surface. In that case, there is a problem that the effectiveness of the touch panel function that enables a touch operation on a large display screen is lost.

  The problem situation will be described with reference to FIG. FIG. 11 shows a case where eight push buttons are displayed on the screen of a large display device having a capacitive touch panel device. Here, even if the operator M tries to touch the third button position 3 of the touch panel body 10, the screen of the display device is large and the finger cannot reach without touching.

  Further, when the resolution accuracy of the touch position equivalent to that of the small touch panel device and the identification performance when the two fingers F of the operator M are close to each other are obtained, the touch position of the touch panel body 10 superimposed on the large display screen is obtained. There has been a problem that the number of electrode wires for detection greatly increases. If the number of electrode lines for touch position detection increases significantly, the number of signal lines in the control circuit and the number of signal lines in the cable connected to the control circuit will increase, resulting in a significant increase in the cost of the touch panel device. There was a problem.

  The present invention has been made in view of the above-described problems. An image displayed on the entire display screen is reduced and displayed in the reduced image area S, and touching the reduced image area S is as if the entire display screen is touched. As shown, a cursor indicating the touch position is displayed.

  In addition, functions such as the positional accuracy of the touch panel device on the display screen other than the reduced image area S described above are minimized, and the cost is greatly reduced.

  In order to solve the above-described problems, the present invention provides a protective insulation in which a plurality of drive signal electrode lines that run parallel to each other and a plurality of signal detection electrode lines that run parallel to each other are arranged in a lattice pattern and provided on the surface side thereof A touch panel device in which a flat touch panel body having a body surface as a touch surface is provided on a display unit, the display control means for controlling an image to be displayed on the display unit, and the drive signal electrode lines in order A transmission circuit that selects and applies a drive signal and the signal detection electrode line are sequentially selected to detect the amount of charge accumulated in the capacitance formed at the intersection of the drive signal electrode line and the signal detection electrode line And a touch position detection means for detecting the touch position of the operator on the touch surface by controlling the transmission circuit and the reception circuit, and the display control means is provided on the entire screen of the display unit. A means for reducing an image to be displayed and displaying it in a reduced image area as a part of the display unit, wherein the touch position detecting means includes a touch position on the reduced image area and a touch position outside the reduced image area. And a touch position coordinate conversion circuit for enlarging the coordinates of the touch position on the reduced image area to the coordinates of the entire screen, and the display control means displays the touch position on the display unit. The touch panel device is characterized in that a cursor is displayed on the coordinates of the whole screen or operated as if the corresponding coordinate position on the whole screen is touched.

  With this configuration, the present invention has an effect of providing a reduced display of the entire display screen in the reduced image area S and displaying the entire display screen as if touched by touching that portion.

  The present invention is the above touch panel device, wherein the drive signal electrode line and the signal detection electrode line outside the reduced image area constitute a node connecting a plurality of nodes, and the transmission circuit is provided for each node. The touch panel device is connected to a receiving circuit.

  The present invention has an effect that the cost of the control circuit can be reduced by this configuration.

  The present invention also improves the accuracy of the touch position detection of the touch operation on the touch surface of the reduced image area S and the entire display unit even in the capacitive touch panel device in which the touch panel body is superimposed on the large display screen. By linking the entire position of the screen and the touch position to the reduced image area S, the cursor is displayed as if the touch operation is performed on the entire screen without moving the touch position over the entire screen. There is an effect that the whole can be operated.

  Further, according to the present invention, the reduced image area S has the same positional accuracy as the conventional one and the identification performance when two fingers are close to each other, and the number of drive signal electrode lines and signal detection electrode lines in the area other than the reduced image area S. As a result, the cost of the control circuit can be greatly reduced.

It is a whole lineblock diagram showing the touch panel device of an embodiment of the present invention. It is typical sectional drawing of the touch-panel main body and display part of the touch-panel apparatus of embodiment of this invention. It is a figure which shows the wiring bundle | flux of the node of the electrode line of embodiment of this invention. It is a general-view figure of the drive signal electrode line and signal detection electrode line of the touch panel main body of embodiment of this invention. It is a figure which shows the several node of the drive signal electrode line and signal detection electrode line of the touchscreen main body of embodiment of this invention. It is a figure which shows a mode that the several node of the drive signal electrode line and signal detection electrode line of the touchscreen main body of embodiment of this invention is connected with wiring. It is a block diagram of the circuit which connects a transmission circuit and a receiving circuit to the touch panel main body of embodiment of this invention. It is a figure which shows the output signal of each part of the transmission circuit of the touchscreen apparatus of embodiment of this invention, and a receiving circuit. It is a block diagram of a control part of a touch panel device of an embodiment of the present invention. It is a flowchart which shows operation | movement of the touchscreen apparatus of embodiment of this invention. It is a figure which shows the example of the image displayed on the display part of the touchscreen apparatus of embodiment of this invention. It is a figure which shows the signal output from the receiving circuit of the touchscreen apparatus of embodiment of this invention.

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram illustrating a touch panel device 1 according to the first embodiment. The capacitive touch panel device 1 according to the first embodiment includes a display unit 40 and a flat plate-like touch panel body 10 superposed on the display unit 40. The display control unit 20 and the touch position detection unit 30 control the display of the display unit 40. It has.

  As shown in FIG. 1 and FIG. 2, the touch panel device 1 touches the finger F of the operator M with the touch surface 2 on the surface of the touch panel body 10 provided to be overlapped with the display unit 40, and touches the finger F. Get location information.

  The touch panel body 10 is provided with drive signal electrode lines Y1 to Y5 and signal detection electrode lines (X1 to X5) intersecting each other. A drive signal (pulse signal) is applied from the transmission circuit 50 to the drive signal electrode lines Y1 to Y5. A receiving circuit 60 is connected to the signal detection electrode lines (X1 to X5), and the receiving circuit 60 receives an electrostatic charge / discharge current signal formed at the intersection of the electrode lines.

  In the touch panel device 1, the display control unit 20 controls the display of the display unit 40 that overlaps the touch panel body 10, and the touch position detection unit 30 controls the operations of the transmission circuit 50 and the reception circuit 60 by a mutual capacitance method. The coordinates of the contact position of the finger F of the operator M on the touch panel device 1 are calculated based on the detection signal of the accumulated charge amount of the electrostatic capacitance at the intersection of the electrode lines output from the receiving circuit 60.

(Touch panel body)
The touch panel body 10 of the touch panel device 1 has a flat plate shape, and a plurality of drive signal electrode lines (Y1 to Y5) that run parallel to each other and a plurality of signal detection electrode lines (X1 to X5) that run parallel to each other as shown in FIG. ) Are arranged in a grid pattern.

  FIG. 2 is a schematic cross-sectional view showing a cross section of the touch panel body 10 shown in FIG. In FIG. 2, the state of the electric field is indicated by a broken line. In addition, since the touch panel body 10 can be configured with a thickness of several millimeters, the touch panel body 10 is actually much thinner than the finger F.

  The touch surface 2 on the surface of the touch panel body 10 that the operator M touches and operates with the finger F is formed of a protective insulator 11 such as melamine resin, and the protective insulator 11 connects the drive signal electrode lines Y1 to Y5. Protect.

  The drive signal electrode lines Y1 to Y5 and the signal detection electrode lines X1 to X5 of the touch panel body 10 are supported by a support sheet 12 such as PET (polyethylene terephthalate), and the drive signal electrode lines Y1 to Y5 are provided on the surface side of the support sheet 12. The signal detection electrode lines X1 to X5 are provided on the back side of the support sheet 12.

  Capacitances C11 and C12 are formed at intersections of electrodes where the drive signal electrode lines Y1 to Y5 and the signal detection electrode lines X1 to X5 overlap with the support sheet 12 interposed therebetween. A current flows from the drive signal electrode lines Y1 to Y5 to the signal detection electrode lines X1 to X5 via the capacitance.

  When the finger F of the operator M touches the surface of the touch surface 2 as shown in FIG. 2, the current flows to the ground via the finger F side, thereby reducing the current flowing through the capacitance C11 at the intersection of the electrode lines. As a result, the charge accumulated in the capacitance C11 decreases. The receiving circuit 60 measures this electric charge, and the touch position detecting circuit 31 of the touch position detecting means 30 calculates the amount of decrease in the electric charge, thereby detecting the position touched by the finger F of the operator M.

(Touch panel electrode wiring)
Hereinafter, an example in which the reduced image region S is provided in the lower left of the screen of the touch panel device 1 as shown in FIG. 6 will be described. However, the position of the reduced image area S on the entire screen is not limited thereto, and may be provided at any position on the entire screen.

  In view of the normal usage of the capacitive touch panel device adapted to a large display screen, high positional accuracy is not required in the area outside the reduced image area S. The wiring of the electrode lines of the touch panel body 10 that determines the positional accuracy of the touch panel device to the transmission circuit 50 and the reception circuit 60 is set to the minimum necessary as follows.

  FIG. 3 shows a configuration of a bundle of electrode lines of the drive signal electrode line Y and the signal detection electrode line X of the touch panel. The configuration of the electrode line of one node of the drive signal electrode line Y or the signal detection electrode line X of the touch panel is such that, as shown in FIG. 3, nine copper wires arranged in a 5 mm width, for example, are bundled and both ends thereof Are connected to form an electrode wire.

  Then, the drive signal electrode lines Y and the signal detection electrode lines X configured by the electrode lines in FIG. 3 are crossed at right angles as shown in FIG. FIG. 4 shows a 5 × 5 matrix of electrode line nodes as an example.

  For example, in the touch panel device 1 having a large display screen with dimensions of about 747 mm in length and about 1329 mm in width, as shown in FIG. 5, the size of a region where one node intersects is the same as the size of a general touch panel device 1. The touch panel body 10 having a size of 5 mm × 5 mm, a 60-inch size (16: 9), a length of 747 mm, and a width of 1329 mm is configured with about 148 drive signal electrode lines and about 266 signal detection electrode lines.

  FIG. 6 shows the connection relationship between the drive signal electrode lines and the signal detection electrode lines. FIG. 6 shows a case where the reduced image area S is provided in the lower left area of the entire screen. In the reduced image area S, signal detection electrode lines X1 to X8 and drive signal electrode lines Y144 to Y148 are set.

  In the area outside the reduced image area S, the two electrode line nodes are electrically connected at the end of the signal line and input to the control circuit as they are. That is, as shown in FIG. 6, the drive signal electrode lines Y1 and Y2 are electrically connected, and the signal detection electrode lines X9 and X10 are electrically connected.

FIG. 7 shows a block diagram of a circuit for connecting the transmission circuit 50 and the reception circuit 60 to the touch panel body 10. By connecting a plurality of nodes of the electrode lines outside the reduced image area S of the touch panel body 10 at the ends of the signal lines, the cost of the circuit of the control unit to which the electrode lines are connected can be reduced. Specifically, the circuit cost can be reduced by reducing the wiring and circuits of the transmission circuit 50 and the reception circuit 60, and the cost of the circuit can be reduced by reducing the wiring and circuits of the touch position detection circuit 31 that controls those circuits.

  Further, it is possible to further reduce the cost of the display control means 30 by connecting more electrode lines outside the reduced image area S, for example, three nodes at the end of the signal line. In this case, the accuracy is lowered, so that the accuracy is allowed.

  Thus, in the reduced image area S, the conventional touch position detection accuracy and the identification performance of the contact positions of two adjacent fingers can be obtained. On the other hand, in the area outside the reduced image area S, the nodes of the drive signal electrode line and the signal detection electrode line are bundled to reduce the circuits of the transmission circuit 50, the reception circuit 60, and the display control means 30. Thereby, the cost of the control part of a touch panel can be reduced.

(Transmission circuit and reception circuit)
As shown in FIG. 7, the touch position detection circuit 31 of the touch position detection unit 30 controls the operation in which the transmission circuit 50 transmits drive signals to the drive signal electrode lines Y1 to Y5. Further, the touch position detection circuit 31 controls an operation in which the reception circuit 60 receives the capacitance detection signals from the signal detection electrode lines X1 to X5. Thereby, the receiving circuit 60 detects the accumulated charge amount of the capacitance for each intersection of the electrode lines. FIG. 8 shows the waveform of the signal of each part of the transmission circuit 50 and the reception circuit 60.

  The transmission circuit 50 includes a drive electrode selection circuit 51 configured by connecting a switching element for each of the drive signal electrode lines Y1 to Y5. The drive electrode selection circuit 51 is controlled by the touch position detection circuit 31 to select the drive signal electrode lines Y1 to Y5 one by one, and sequentially outputs the pulsed drive signals as shown in FIG. 8A. Apply to electrode lines Y1-Y5.

  As shown in FIG. 7, the receiving circuit 60 includes a receiving electrode selection circuit 61, a charge integration circuit 62, and an AD conversion circuit 63. The reception electrode selection circuit 61 is controlled by the touch position detection circuit 31 to sequentially select the signal detection electrode lines X1 to X5, and causes the charge integration circuit 62 to sequentially input the output signals from the signal detection electrode lines X1 to X5.

  As shown in FIG. 8A, the reception electrode selection circuit 61 includes one signal detection electrode line X1 to X5 for each of the drive signal electrode lines Y1 to Y5 selected by the drive electrode selection circuit 51. The charge / discharge current signals of the signal detection electrode lines X1 to X5 are sequentially selected and transmitted to the charge integration circuit 62. Thereby, the charge / discharge current signals for all the intersections of all the electrode lines are extracted by reading the charge / discharge current signals in all the combinations of all the drive signal electrode lines Y1 to Y5 and all the signal detection electrode lines X1 to X5. be able to.

  The charge integration circuit 62 time-integrates the charge / discharge current signals (analog signals) of the signal detection electrode lines X1 to X5 input from the reception electrode selection circuit 61, and represents the accumulated charge amount of the capacitance at each intersection of the electrode lines. The voltage signal is converted, and the voltage signal is transmitted to the AD conversion circuit 63. The AD conversion circuit 63 converts the voltage signal into a digital signal represented by digital data and outputs the digital signal.

As shown in FIG. 8B, when a drive signal (pulse signal) is applied to the drive signal electrode lines Y1 to Y5, the peak of the output of the charge integration circuit 62 changes with a predetermined amplitude, but the finger F of the operator M Touches the intersection of the electrode lines, the operator's finger F has conductivity and acts as a ground ground. As a result, a change occurs in the electric lines of force between the finger and the drive signal electrode line Y, and between the finger F and the signal detection electrode line X, and the output voltage of the charge integration circuit 62 decreases as shown in FIG.

(Control part)
FIG. 9 is a block diagram of a circuit of the control unit of the touch panel device 1. As shown in FIG. 9, the control unit includes display control means 20, touch position detection means 30, transmission circuit 50, and reception circuit 60.

(Display control means)
The display control means 20 includes an image data creation circuit 21 that creates image data to be displayed, and an image data reduction circuit that creates image data to be displayed in the reduced image area S by reducing the image created by the image data creation circuit 21. 22 and an image data composition circuit 23 for creating composite image data by combining the image data reduced for the reduced image area S with the original image data created by the image data creation circuit 21.

  In addition, the operator M receives the touch position data of the finger F on the touch surface 2 from the touch position detection unit 30 and controls the image data creation circuit 21 to create image data including the cursor image. A cursor image adding circuit 24 is provided.

(Touch position detection means)
The touch position detection unit 30 includes a touch position detection circuit 31, an accumulated charge map storage circuit 32, a reduced screen / whole screen determination circuit 33, and a touch position coordinate conversion circuit 34.

  The touch position detection circuit 31 controls the transmission circuit 50 to cause the transmission circuit 50 to sequentially select the drive signal electrode lines Y1 to Y5, and pulses the drive signal electrode lines Y1 to Y5 as shown in FIG. The drive signal is applied. Further, the receiving circuit 60 is controlled to cause the receiving circuit 60 to sequentially select the signal detection electrode lines X1 to X5, and to control the signal detection electrode lines X1 to X5 to be taken out.

  Then, the receiving circuit 60 measures the amount of charge accumulated in each capacitance at the intersection of the electrode lines, creates digital data of the value, and transmits it to the touch position detection circuit.

  The accumulated charge map storage circuit 32 stores the amount of charge accumulated in the capacitance of the intersection of the electrode lines in a state where the finger of the operator M is not in contact.

  The touch position detection circuit 31 calculates the difference between the amount of electrostatic charge at the intersection of the electrode lines received from the receiving circuit 60 and the amount of charge stored in the accumulated charge map storage circuit 32, and the magnitude of the difference. The touch position of the finger F of the operator M is detected.

  The reduced screen / whole screen determination circuit 33 determines whether the touch position is the position of the reduced image region S or the position of the other whole screen.

  The touch position coordinate conversion circuit 34 calculates the position coordinates of the cursor displayed on the screen based on the determination result of the reduced screen / whole screen determination circuit 33 and transmits the position coordinate data to the cursor image addition circuit 24.

(Operation procedure)
Hereinafter, the operation of the capacitive touch panel device 1 of the present embodiment will be described with reference to the flowchart of FIG. 10 and FIGS. 11 and 12.

(Step S1) Screen Display Processing In the screen display processing in step S1 of FIG. 10, the display control means 20 applies, for example, eight push buttons on the screen of the large display unit 40 of the touch panel device 1 as shown in FIG. indicate. Here, the display control unit 20 reduces the image displayed on the entire display unit 40 and displays the reduced image in the reduced image area S.

  In step S3, the operator M touches the touch surface 2 of the touch panel body 10 with the finger F to operate the screen. The touch position detection means 30 detects the contact position of the operator M's finger F on the touch surface 2.

  The details of the operation of the display control means 20 are as follows. The image data creation circuit 21 of the display control means 20 receives the cursor position data at the position where the operator M's finger F touches from the cursor image addition circuit 24, and Create image data to be displayed on the screen. Next, the image data reduction circuit 22 creates image data obtained by reducing the screen generated by the image data creation circuit 21.

  Next, the image data composition circuit 23 creates composite image data by combining the image data reduced by the image data reduction circuit 22 with the image data created by the image data creation circuit 21. Then, the display unit 40 displays the composite image data.

(Step S2) Charge / Discharge Processing for Capacitances at Intersections of Electrode Lines The touch position detection circuit 31 of the touch position detection means 30 controls the transmission circuit 50 connected to the electrodes of the touch panel body 10 to drive signal electrode lines (Y1 to Y5) are sequentially selected and a drive signal is applied, and the receiving circuit 60 is controlled to sequentially select the signal detection electrode lines (X1 to X5), and the capacitance at the intersection of the electrode lines. For example, the charge / discharge current of C12 is detected.

(Step S3) When the operator M is going to touch the 3rd button position 3 of the touch panel body 10 because the whole screen is large, the finger F is 3rd. It does not reach button position 3. Instead of the third button position 3, the operator M touches the third button position 3s displayed in the reduced image area S provided at the lower left position of the screen as shown in FIG.

(Step S4) Processing for Detecting Accumulated Charge at Intersection Capacitance As shown in FIG. When the electric field at the intersection of the electrode lines changes, the current flowing through the electrostatic capacitance C11 at the intersection of the electrode lines decreases, and the amount of charge accumulated in the electrostatic capacitance C11 decreases. That is, according to the touch operation of the touch surface 2 of the touch panel body 10 by the operator's finger F, the capacitance at the intersection of the grid-like drive signal electrode lines (Y1 to Y5) and the signal detection electrode lines (X1 to X5). The current that flows in changes.

  The receiving circuit 60 receives a charge / discharge current signal of the capacitance C11 flowing through the electrodes of the signal detection electrode lines (X1 to X5) in response to the drive signal applied to the drive signal electrode lines. That is, the receiving circuit 60 measures the current due to the amount of charge accumulated in the capacitances C11 and C12 at the intersections of the electrode lines where the drive signal electrode lines Y1 to Y5 and the signal detection electrode lines X1 to X5 intersect. Then, by integrating the current, the value of the accumulated charge at each intersection of the electrode lines is detected.

  FIG. 12 is a diagram illustrating a signal output from the charge integration circuit 62 of the reception circuit 60 in accordance with the position of the touch operation on the touch surface 2 illustrated in FIG. By selecting the drive signal electrode lines Y1 to Y5 and the signal detection electrode lines X1 to X5, the signals output from the signal detection electrode lines X1 to X5 are time-integrated by the charge integration circuit 62 for each intersection of the electrode lines, and the intersection is electrostatically charged. A voltage signal representing the accumulated charge amount of the capacitor is obtained.

  As shown in FIG. 12A, when touching the intersection of the drive signal electrode line Y1 and the signal detection electrode line X4 on the touch surface 2, the drive signal electrode line Y1 and the signal detection electrode line X4 The amount of charge accumulated in the electrostatic capacitance at the intersection (X4, Y1) of the electrode line decreases. Therefore, as shown in FIG. 12B, the charge integration circuit 62 detects the charge / discharge current of the charge accumulated in the electrostatic capacitance at the intersection of the drive signal electrode line Y1 and the signal detection electrode line X4 and integrates the time integration. When obtaining a voltage value, the level of the voltage signal decreases.

  In addition, the amount of charge accumulated in the capacitances of the intersections (X3, Y1) and (X5, Y1) and (X3, Y2), (X4, Y2) and (X5, Y2) of the electrode lines The level of the output voltage signal of the charge integration circuit 62 is slightly reduced with a slight decrease.

  The AD conversion circuit 63 converts the level of the voltage signal representing the accumulated charge amount of the electrostatic capacitance at the intersection into digital data and outputs it to the touch position detection circuit 31 of the touch position detection means 30.

(Step S5) Touch Position Detection Processing The touch position detection circuit 31 of the touch position detection means 30 receives the digital data of the charge amount accumulated in the capacitance C11 at the intersection of the electrode lines from the AD conversion circuit 63 of the reception circuit 60. Receive. Then, the difference between the charge amount and the value of the charge amount stored in the accumulated charge map storage circuit 32 is calculated. When the difference is large, the operator's finger F touches the intersection of the electrode lines. It is determined that

  In the case of FIG. 12, the amount of decrease in the amount of charge accumulated in the capacitance at the intersection of the electrode lines is the largest at the intersection (X4, Y1) of the electrode lines. For this reason, the touch position detection circuit 31 determines that the intersection (X4, Y1) of the electrode lines with the greatest decrease in the output value is the touch position.

  In this way, the touch position detection circuit 31 of the touch position detection unit 30 controls the transmission circuit 50 to detect the operator's output based on the change in the output signal of the electrodes of the signal detection electrode lines (X1 to X5) detected by the reception circuit 60. The contact position of the finger F on the touch surface 2 is detected.

(Step S6) Touch Position Coordinate Conversion Process The touch position coordinates detected by the reduced screen / whole screen determination circuit 33 are the position coordinates in the reduced image area S or positions in other areas. Determine if it is a coordinate.

  In the example of FIG. 11, the reduced screen / whole screen determination circuit 33 determines that the touch position coordinate of the detected third button position 3 s is in the reduced image area S. Since the touch position coordinates are within the reduced image area S, the touch position coordinate conversion circuit 34 converts the coordinates to the position coordinates of the entire screen, and thereby the third button position 3 on the original screen is touched. Shall be.

  Next, based on the determination result, the touch position coordinate conversion circuit 34 performs a position coordinate conversion process for converting the position coordinates into the position coordinates of the entire screen when the position coordinates are within the reduced image area S. Further, when the position coordinates are not in the reduced image area S, the touch position coordinate conversion circuit 34 sets the coordinates as they are as the position coordinates.

(Step S7) Touch Position Cursor Display Processing Next, the cursor image addition circuit 24 of the display control means 20 displays the touch position cursor on the entire screen using the position coordinate data calculated by the touch position coordinate conversion circuit 34. Perform image processing.

  Thereby, the display control means 20 displays the cursor of the part corresponding to the touch part in the reduced image area S at the position corresponding to the entire screen. In this way, the touch panel device 1 displays a cursor that moves in the entire screen of the display unit 40 as if the operator M is freely touching the position of the entire display screen.

  In this way, in the capacitive touch panel device 1 adapted to a large display screen, the operator M brings the finger F into contact with the reduced image area S by linking the reduced image area S with the position of the entire screen. By merely moving the cursor indicating the touch position within a wide area of the entire screen of the display unit 40, the touch panel device 1 including a man-machine interface for designating the touch position on the entire screen can be realized.

DESCRIPTION OF SYMBOLS 1 ... Touch panel apparatus 2 ... Touch surface 3 ... Button position 3s ... Button position 10 ... Touch panel main body 11 ... Protective insulator 12 ... Support sheet 20 ... Display control means 21 ... Image data creation circuit 22 ... Image data reduction circuit 23 ... Image data synthesis circuit 24 ... Cursor image addition circuit 30 ... Touch position detection means 31 ... Touch position detection circuit 32 ... Accumulated charge map storage circuit 33... Reduced screen / whole screen determination circuit 34... Touch position coordinate conversion circuit 40... Display unit 50. Receiving circuit 61... Receiving electrode selecting circuit 62... Charge integrating circuit 63... AD conversion circuit C 11, C 12. ..Reduced image area X To X5 · · · signal detecting electrode line Y1 through Y5 · · · drive signal electrode line

Claims (2)

A flat touch panel body in which a plurality of drive signal electrode lines running parallel to each other and a plurality of signal detection electrode lines running parallel to each other are arranged in a grid and the surface of the protective insulator provided on the surface side is the touch surface Is a touch panel device provided on the display unit,
Display control means for controlling an image displayed on the display unit, a transmission circuit for sequentially selecting the drive signal electrode lines and applying a drive signal, and the drive signal electrodes by sequentially selecting the signal detection electrode lines A receiving circuit that detects the amount of charge accumulated in the capacitance formed at the intersection of the line and the signal detection electrode line, and the touch position of the operator on the touch surface by controlling the transmitting circuit and the receiving circuit Touch position detecting means for detecting
The display control means includes means for reducing an image to be displayed on the entire screen of the display unit and displaying the reduced image on a part of the reduced image area of the display unit;
The touch position detecting means detects the touch position to the reduced image area and the touch position outside the reduced image area, and expands the coordinates of the touch position to the reduced image area to the coordinates of the entire screen. Touch position coordinate conversion circuit,
The touch panel, wherein the display control unit is operated as if the cursor indicating the touch position is displayed on the coordinates of the whole screen on the display unit, or as if the corresponding coordinate position of the whole screen is touched. apparatus.   2. The touch panel device according to claim 1, wherein the drive signal electrode line and the signal detection electrode line outside the reduced image area constitute a node connecting a plurality of nodes, and the transmission circuit and the reception circuit are provided for each node. A touch panel device characterized by being connected to the touch panel.

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