JPH09274538A - Matrix-shaped touch panel input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the increase of number of wiring with resolution improvement. SOLUTION: A matrix-shaped touch panel input device 1 is provided with a touch panel 4 arranging plural transparent electrodes 40 and 41 in lateral and longitudinal axial directions, CPU 2, driving part 6 for impressing a driving voltage to one arranged electrode corresponding to an instruction from this CPU 2, and interface part 5 having a detection part 7 for detecting the voltage of the other arranged electrode and transmitting this detecting signal to the CPU 2. The driving part 6 is arranged near the terminal part of the touch panel 4, every suitable number of electrodes connected to the driving part 6 are defined as one group, and a parallel converting means 8 is provided for each group so that the driving voltage can be impressed to the electrodes inside the group based on the instruction signal from the CPU 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface between a touch panel and a CPU (central processing unit) for controlling the touch panel and receiving information data from the touch panel in a matrix type touch panel input device.

[0002]

2. Description of the Related Art A touch panel input device is a type of coordinate input device in which a transparent touch panel (4) is mounted on a display unit (3) and a surface of the touch panel (4) is directly pressed with a finger. Thus, the pressed position can be detected and an instruction signal can be input to a computer or the like. The touch panel input device is easy, intuitive and easy to understand,
In recent years, it has been widely used as an input device for FA (Factory Automation), ATM (Automatic Teller Machine) of banks, and the like. Touch panel input device,
As shown in FIG. 9, a touch panel (4), a CPU (2) for controlling the touch panel (4) and receiving information data from the touch panel (4), the touch panel (4) and the CPU
An interface unit (5) arranged between (2), which drives the touch panel (4) based on an instruction signal and a control signal from the CPU (2) and transmits information data from the touch panel (4) to the CPU (2). ) And. The interface unit (5) operates the touch panel (4) based on the instruction and control from the CPU (2), and the information data at this time is stored in the CPU (2).
The input coordinates can be specified by the reception.

There are two types of touch panel input devices, an analog type and a matrix type, for specifying the coordinate point for which an input operation has been performed, and both are in practical use for normal input operations. An analog type touch panel input device, for example, like the touch panel input device described in Japanese Patent Application Laid-Open No. 7-302168, has two resistive films that cover the entire touch panel and have counter electrodes at the ends, in which the direction of each electrode is changed. The input coordinates are specified by applying a voltage to one of the counter electrodes, detecting the partial pressure from the other counter electrode, and alternately by applying a voltage to one of the counter electrodes and shifting them by 90 degrees. On the other hand, the matrix type touch panel input device (1) has a plurality of transparent electrodes (40) (41) arranged in each axial direction as shown in FIG.
Based on instructions from (2), transparent electrodes arranged in a certain axial direction (X-axis direction in the figure) (hereinafter referred to as array electrodes) (40)
A drive voltage is sequentially applied to each of the electrodes to detect each voltage of the array electrode (41) in the other axis direction (Y axis direction in the figure), and the detection signal is applied to C
The input coordinates are specified by transmitting to PU (2). By the way, regarding important commands among the input operations, there are operations that can be entered only by touching two points on the panel at the same time in order to be careful of the input operation. Excludes input. Simultaneous detection of two inputs by simultaneous two-point touch operation is difficult in principle with an analog type, and the matrix type is exclusively used.

[0004]

In the conventional touch panel device (1), due to the space limitation around the display,
The interface unit (5) is arranged apart from the touch panel (4), and the space between them is connected by a transmission line. recent years,
As the resolution of the display becomes higher, it is required to increase the resolution of the touch panel (4). However,
In the case of the matrix type, in order to increase the resolution of the touch panel (4), it is necessary to increase the number of array electrodes (40) (41) in each axial direction, respectively, and as a result, the number of electrodes and the interface section (5) The number of input / output pins and the total number of transmission lines provided for driving or detecting between the array electrodes (40) (41) and the interface section (5) are very large, and the touch panel device (1) becomes huge. Will be done.

For example, the VGA standard, which is a standard display standard for personal computers, has a resolution of 640 horizontal.
Dots x vertical 480 dots. If each electrode (40) (41) is provided for every 16 dots, the array electrode (40) in the horizontal axis direction will be 40
30, 30 vertical array electrodes (41) are required.
The number of transmission lines between 0) (41) and the interface part (5)
A total of 70 of (40) and (41) is the minimum required. Similarly, X, which is a high-resolution display standard for personal computers
According to the GA standard, the resolution is 1024 dots horizontally × 768 dots vertically. In this case, 64 horizontal array electrodes (40) and 48 vertical array electrodes (41) are required. ) (41) and the interface section (5) require at least 112 transmission lines, and a wide space for accommodating a large amount of wiring is required at the periphery of the touch panel (4).

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to avoid increasing the size of a matrix type touch panel input device by significantly reducing the number of transmission lines provided on the periphery of the touch panel for each electrode.

[0007]

[Means for Solving the Problems] The interface unit is C
A drive unit that applies a drive voltage to the electrodes based on an instruction from the PU and a detection unit that detects the voltage of the electrodes and sends the detection signal to the CPU are provided. The driving unit is provided near the end of the touch panel, and one group of electrodes connected to the driving unit is provided for each appropriate number, and parallel conversion means is provided for each group, based on the instruction signal from the CPU. A drive voltage is applied to the electrodes in the group. Further, by connecting the parallel conversion means for each group in series, it is possible to receive one instruction signal from the CPU in the drive section. Further, the detection unit is provided in the vicinity of the end of the touch panel, and an appropriate number of electrodes connected to the detection unit are set as one group, and serial conversion means is provided for each group to detect a detection signal at an electrode in the group. Is converted into a serial signal and output to the CPU. Further, by connecting the serial conversion means for each group in series, the detection signal is converted into one serial signal from the detection unit to the CPU.
You can also send it to.

[0008]

[Operation and effect] When the drive unit or the detection unit is arranged near the end of the touch panel, the length of the parallel wiring between the touch panel and the drive unit or the detection unit can be shortened, and further,
The number of instruction signal transmission lines from the CPU to the parallel conversion means or the serial signal transmission lines from the serial conversion means to the CPU can be reduced to one, and the wiring space to be provided around the touch panel can be significantly reduced. . Further, by connecting the parallel conversion means or the serial conversion means in series, it is possible to reduce the number of transmission lines for the instruction signal from the CPU to the drive section or the transmission line for the serial signal from the detection section to the CPU to one. Therefore, the space can be further reduced.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings attached to the present application, wiring for power supply from the power supply to each electric circuit is omitted for simplification.

(First Embodiment) FIGS. 1 to 5 show a first embodiment of a matrix type touch panel input device (1) of the present invention. In the present embodiment, similarly to the conventional matrix type touch panel input device (1) shown in FIG. 9, a drive voltage is sequentially applied to the array electrodes (40) in the X-axis direction to array electrodes (41) in the Y-axis direction. ) To detect each voltage. Therefore, as shown in FIGS. 1 and 2, the driving unit 6 is arranged at the peripheral edge of the array electrode 40 in the X-axis direction, and the array electrode in the Y-axis direction is arranged as shown in FIGS. The detection part (7) is provided around the edge of 41).

As shown in FIG. 2, the drive unit (6) includes a CPU.
The transmission lines (61) and (62) connected to (2) and receiving the instruction signal A and the control signal B from the CPU (2) are connected to each array electrode (40), and a drive voltage is applied to each. The transmission line (63) is connected. The driving unit (6) includes a driver (60) provided for each array electrode (40). Each driver (60) receives the instruction signal A, and based on the instruction signal, the array electrode (40)
A drive voltage is applied to. The driving electrode (6) has an array electrode (40)
Further, the appropriate number of the drivers (60) is set as one group, and the parallel conversion means (8) is provided for each group. The first-stage parallel conversion means (8a) transmits the instruction signal A received from the CPU (2) to the driver (60) in the group based on the control signal B from the CPU (2), and Later parallel conversion means
Send to (8). Based on the control signal B, the parallel conversion means (8) in the middle stage is connected to the parallel conversion means (8) in the front stage.
The instruction signal A received from the above is transmitted to the driver (60) in the group and is also transmitted to the parallel conversion means (8) in the subsequent stage. Then, the final stage parallel conversion means (8b) only transmits the instruction signal A received from the front stage parallel conversion means (8) to the driver (60) in the group based on the control signal B.

Parallel conversion means (8) in this embodiment
In order to sequentially apply a driving voltage to the array electrodes (40), for example, TTL (transistor-transistor logic circuit)
Serial-in-parallel-out shift register (80), such as 74164 in the 74 series, which is a unified standard in
Use As shown in FIG. 3, the shift register (80) receives the instruction signal A from the parallel conversion means (8) at the previous stage at the data input terminal D. The control signal B is input to the clock input terminal and is input to the reset input terminal R and the load signal DLD1 that moves the electrode (40) to which the drive voltage is applied to the next electrode (40). A reset signal DCL for ending the application of the driving voltage to the electrode (40) is included and received from the CPU (2) at the input terminal. The parallel output terminals Q are connected to the drivers (60) in each group. The last terminal Qn of the parallel output terminals Q connected to the driver (60) is the data input terminal D of the shift register (80) in the parallel conversion means (8) in the subsequent stage.
Connect to.

As shown in FIG. 4, the detection section (7) includes a transmission line (73) connected to each array electrode (41) and receiving a voltage signal from the electrode (41), and a CPU (2). A transmission line (72) for receiving a control signal from the CPU (2) and a transmission line (71) for transmitting a serial signal to the CPU (2) are connected. Detection unit
(7) includes an amplifier (70) provided for each array electrode (41). Each amplifier (70) detects the voltage of each array electrode (41) and converts it into a detection signal suitable for processing by the CPU (2).
The detection unit (7) has a group of the array electrodes (41) and the amplifiers (70) of appropriate number, and a serial conversion means (9) is provided for each group. The first-stage serial conversion means (9a) is a CPU
Based on the control signal C from (2), each amplifier (70) in the group
The detection signal from is converted into a serial signal S1 and transmitted to the serial conversion means (9) in the subsequent stage. The serial conversion means (9) in the intermediate stage converts the detection signal from each amplifier (70) in the group into a serial signal based on the control signal C, and receives the serial signal from the serial conversion means (9) in the previous stage. Signal Sj-
1 (2.ltoreq.j.ltoreq.k-1, j is an integer), and the added serial signal Sj is added to the subsequent serial conversion means (9).
Send to Then, based on the control signal C, the serial conversion means (9b) at the final stage (the k-th stage) outputs each amplifier (7
The detection signal from (0) is converted into a serial signal and added to the serial signal Sk-1 received from the serial conversion means (9) in the preceding stage, and a series of serial signals Sk is transmitted to the CPU (2).

Serial conversion means (9) in this embodiment
Uses a parallel-in-serial-out shift register (90), such as the 74165 in the 74 series in TTL, to convert the sensed signal from the array electrode (41) into a series of serial signals. The shift register (9
0), as shown in FIG. 5, the serial signal Sj-1 transmitted from the serial conversion means (9) at the previous stage is input to the serial input terminal SI.
The signal is received at N, and the detection signal from the amplifier (70) is received at the data input terminal D. The control signal C is the load input terminal L
Load signal RLD input to D and storing a detection signal
And a clock signal CLK which is input to the clock input terminal and becomes the timing for transmitting the serial signal, and is received from the CPU (2) at the input terminal. Then, the terminal SOUT which outputs the serial signal is connected to the serial input terminal SIN of the shift register (90) in the serial conversion means (9) in the subsequent stage.

Next, the touch panel according to this embodiment
The operation of specifying the input coordinates in (4) will be described. CPU (2)
2 and 3, one of the instruction signals A is input to the data input terminal D of the serial-in / parallel-out shift register (80) in the first-stage parallel conversion means (8a) of the drive unit (6). Send a pulse signal. Next, DLD1
When one pulse signal is transmitted as a signal, the pulse signal is output from the first output terminal Q1 of the shift register (80) and transmitted to the first driver (60a). The driver (60a) applies a drive voltage to the first array electrode (40a). At this time, in the detection unit (7), in FIG. 4 and FIG. 5, the amplifier (70) converts the voltage of each array electrode (41) into a detection signal, and the serial conversion means (9) provided for each group. Parallel-in-serial-out shift register (9
It is transmitted to the data input terminal D of 0). Next, CPU (2)
Sends an RLD signal to the shift register 90, stores the detection signal, and then sequentially outputs the stored detection signal as a serial signal in synchronization with the CLK signal. Subsequently, the serial signal Sj-1 from the serial conversion means (9) at the preceding stage is output. As a result, the detection signals of all the array electrodes (41) are transmitted to the CPU (2) as a series of serial signals Sk. When the transmission of the serial signal Sk to the CPU (2) is completed, the CPU (2) is
Send the DLD1 signal to (6) again, and the next array electrode (40)
A drive voltage is applied to the detector, and the above-described operation of the detection unit (7) is repeated. Repeat this to the last driver (60) in the group,
When the instruction signal A is transmitted from the output terminal Qn of the shift register (80), the instruction signal A is the parallel conversion means of the subsequent stage.
The signal is transmitted to (8), and then the driving voltage is applied to the array electrode (40) from the parallel conversion means (8) in the subsequent stage.

By repeating the above operation, a drive voltage can be sequentially applied to each array electrode (40), and the detection signal at each time can be transmitted to the CPU (2) as a serial signal. (2) can specify the input coordinates of the touch panel (4). In addition, touch panel
If the number of coordinates that can be input at one time to (4) is limited to, for example, 2 or less, the number of specified input coordinates before applying the drive voltage to the last array electrode (40) , When the limit is reached, the CPU (2) causes the drive unit (6) to
By transmitting a signal and clearing the shift register (80), the operation of specifying the input coordinates can be completed.

(Second Embodiment) Next, a second embodiment of the touch panel input device (1) of the present invention will be described. The input position specifying method in this embodiment is as shown in FIG.
First, a driving voltage is applied to all array electrodes (41) in the Y-axis direction all at once, each voltage in the array electrodes (40) in the X-axis direction is detected, and the X-axis component of the input coordinate is specified. A method of applying a drive voltage to the array electrode (40) at the specified coordinate position, detecting each voltage in the array electrode (41) in the Y-axis direction, and specifying the Y-axis component of the input coordinates. Japanese Patent Laid-Open No. 7-110741
It is described in. In the present embodiment, as shown in FIG. 8, it is active low, and when a drive voltage is applied to the electrodes, the voltage of the electrodes is at the L (low) level.
When using this method, array electrodes (40) (41) in each axial direction
In addition, it is necessary to provide both the drive unit (6) and the detection unit (7). Therefore, as shown in FIG. 6, both array electrodes (40) (41)
A parallel conversion means (8) and a driver (60) on the driving side (64) and a serial conversion means (9) and an amplifier (70) on the detection side (74) are provided for each group. In addition, this embodiment is the first
Since only the driving operation is different from that of the embodiment, a driver (60), a serial conversion means (9) and an amplifier (7) will be described below.
The description of (0) is omitted since it is the same as that of the first embodiment, and the parallel conversion means (8) in both axial directions will be described.

As shown in FIG. 8A, the drive section 6 in the Y-axis direction applies a drive voltage to all array electrodes 41 at once based on an instruction signal from the CPU 2. . Therefore, the parallel conversion means (8) arranged in the Y-axis direction is shown in FIG.
As described above, only the amplifier (82) that shapes the received signal may be used. The amplifier (82) is a parallel conversion means of the preceding stage.
Receive the instruction signal from (8), arrange the shape of the instruction signal,
Each driver (60) in the group and parallel conversion means (8) in the subsequent stage
Send to The drive unit (6) in the X-axis direction is a desired array electrode.
The drive voltage may be applied only to (40). Therefore, as shown in FIG. 7A, the parallel conversion means 8 arranged in the X-axis direction is a serial-in-parallel-out shift register.
(80) and, for example, 7427 of the 74 series in TTL
A D-FF (flip-flop) circuit (81) such as 3 is used. The shift register (80) receives the instruction signal A from the parallel conversion means (8) at the preceding stage at the data input terminal D, and uses it as the control signal B from the CPU (2) in the serial conversion means (9). The received clock signal CLK is received at the clock input terminal. The parallel output terminal Q is D
-The driver (60) in each group via the FF circuit (81)
Connect to. The D-FF circuit (81) receives, as the control signal B, a load signal DLD2 for applying a drive voltage at a desired electrode (40) at a clock input terminal. Further, the reset input terminal R of both the shift register (80) and the D-FF circuit (81) has, as a control signal B, a reset signal for ending the application of the drive voltage to the electrode (40) after the identification of the coordinates is completed. Receive DCL. Then, in the shift register (80), the driver (6
The last terminal Qn of the parallel output terminals Q connected to (0)
Is connected to the data input terminal D of the parallel conversion means (8) in the subsequent stage.

Next, the touch panel in this embodiment
The operation of identifying the input position in (4) will be described. In this embodiment, since the active low, the array electrode (4
The voltage of 0) (41) is usually at H (high) level, and becomes L (low) level when the driving voltage is applied by the driver (60), and the electrode in contact with the L level electrode becomes L level. Become. First, when the CPU (2) sends an instruction signal A to the drive unit (6) in the Y-axis direction, the instruction signal A is sent to all the drivers (60) in the Y-axis direction at once, and all the drivers in the Y-axis direction are sent. Array electrode (41)
Drive voltage is applied all at once and becomes L level. At this time, as shown in FIG. 8A, if the second matrix in the X-axis direction and the second matrix in the Y-axis direction are pressed and are in contact with each other, the second array electrode in the Y-axis direction (41 ) And the second array electrode (40) in the X-axis direction are in contact with each other. Therefore, the second array electrode (40) in the X-axis direction becomes L level. The detection unit (7) in the X-axis direction is similar to the first embodiment in that each array electrode is
The voltage of (40) is converted into a detection signal, further converted into a series of serial signals Sk, and transmitted to the CPU (2). The serial signal Sk enables the CPU (2) to specify the component of the input coordinate in the X-axis direction.

Next, the CPU (2) sets all electrodes (40) (41) to H level.
After returning to the level, the instruction signal A is transmitted to the drive unit (6) in the X-axis direction. In the shift register (80), the instruction signal A sequentially moves the output terminal Q that outputs the instruction signal A based on the CLK signal. Then, when the output of the instruction signal A moves to the output terminal Q connected to the array electrode (40) existing in the X-axis direction component of the input coordinate specified above, CP
The U (2) sends a DLD2 signal to the D-FF circuit (81) and sends an instruction signal only to the driver (60) connected to the array electrode (40), and only the array electrode (40). To L level. At this time, since the second array electrode (41) in the Y-axis direction and the second array electrode (40) in the X-axis direction are in contact,
As shown in (b), the second array electrode (40) in the Y-axis direction is
It becomes L level. Similar to the first embodiment, the Y-axis direction detection unit (7) converts the voltage of each array electrode (41) into a detection signal and further into a series of serial signals Sk to convert the voltage to CP.
Send to U (2). By the serial signal Sk, the CPU
The item (2) can specify the Y-axis direction component of the input coordinates, and the input coordinates of the touch panel (4) can be specified by the above. In addition,
If there are multiple X-axis direction components of the specified input coordinates, C
The PU (2) sends a DCL signal to the drive unit (6) in the X-axis direction to return all the electrodes (40) (41) to the H level again, and then each X
The driving operation for the array electrode (40) in the X-axis direction may be repeated for each axial component.

Therefore, in both embodiments, the touch panel
The number of transmission lines connecting between the drive unit (6) and the detection unit (7) arranged on the periphery of (4) and the CPU (2) arranged apart from the touch panel (4) is the same as that for the instruction signal A. , For the DLD1 signal (for the DLD2 signal in the second embodiment), for the DCL signal,
Six RDL signals, CLK signals, and serial signals may be used, and the number of transmission lines does not change even if the number of electrodes increases. Therefore, the number of wires from the peripheral edge of the touch panel (4) to the outside can be significantly reduced, and the space for wiring to be provided on the peripheral edge of the touch panel can be significantly reduced.
Further, the parallel conversion means (8) is connected in series to transmit an instruction signal to the parallel conversion means (8) in the subsequent stage, and the serial conversion means (9) is connected in series to obtain the serial conversion means in the subsequent stage. Since the serial signal is sent to (9), the CPU
It is not necessary to connect the instruction signal transmission line and the serial signal transmission line from (2) to each parallel conversion means (8) and each serial conversion means (9), respectively, and it is possible to connect the CPU (2) to the first parallel stage. Conversion means (8a) and final stage serial conversion means
The instruction signal transmission line and the serial signal transmission line may be connected only to (9b), respectively. Further, the electric circuits such as the driver (60) and the amplifier (70) used in the present application are also used in the conventional touch panel input device (1), and the parallel conversion means (8) and the serial conversion means ( 9)
Since a commercially available IC or the like can be used, the manufacturing cost does not increase. In addition, it is necessary to dispose the power supply wiring for operating the electric circuits of the drive unit (6) and the detection unit (7) from the power supply circuit to the periphery of the touch panel (4), but the number of the wiring is large. The number of wirings is also several, and the number of wirings required is the same even if the number of electrodes is increased. Therefore, the effect of the invention does not change.
In addition, the second embodiment has a drive unit for both the X axis and the Y axis.
Since (6) and the detection unit (7) are provided, a larger space is required than in the first embodiment, but since it is not necessary to sequentially apply the drive voltage to the electrodes, the input position can be specified quickly.

The description of the above embodiments is for the purpose of describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. or,
The configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims. For example, in the above-described embodiment, the array electrodes (40) (41) in both the X-axis direction and the Y-axis direction are arranged at an appropriate number.
Although a group is used, even if only one of the array electrodes is divided into groups, the effect of the present invention in which the number of divided transmission lines is drastically reduced remains unchanged. In the above embodiment, the serial-in-parallel-out shift register (80), the parallel-in-serial-out shift register (90), etc. are used as the parallel conversion means (8) and the serial conversion means (9). Any electric circuit can be selected as long as the action and effect can be realized. Furthermore, an arbitrary method can be selected as the method of specifying the input coordinates. At this time, the arrangements of the drive unit (6) and the detection unit (7) are changed according to the selected method, and the parallel conversion unit (8) and the serial conversion unit are arranged.
It is apparent from the first and second embodiments that the circuit of (9) also changes.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a touch panel input device according to the present invention.

FIG. 2 is an enlarged block diagram of a main part of the drive unit shown in FIG.

FIG. 3 is a circuit example showing the parallel conversion means of FIG.

FIG. 4 is an enlarged block diagram of a main part of a detection unit in FIG.

5 is a circuit example showing the serial conversion means of FIG.

FIG. 6 is a principal block diagram showing a drive side and a detection side in a group in both array electrodes in the second embodiment of the present invention.

FIG. 7 is a circuit example showing the parallel conversion means of FIG.
(A) is for an array electrode in the X-axis direction, and (b) is for an array electrode in the Y-axis direction.

FIG. 8 is a schematic diagram showing an operation of identifying input coordinates in the second embodiment.

FIG. 9 is a block diagram showing a conventional touch panel input device.

[Explanation of symbols]

 (1) Touch panel input device (2) CPU (4) Touch panel (5) Interface section (6) Drive section (7) Detection section (8) Parallel conversion means (9) Serial conversion means

Claims (6)

[Claims] 1. A plurality of transparent electrodes arranged in a horizontal axis direction and a vertical axis direction.
A touch panel (4) on which (40) and (41) are arranged, a CPU (central processing unit) (2), and a drive voltage is applied to electrodes arranged in one axial direction according to an instruction from the CPU (2). Drive part
(6), and an interface section (5) having a detection section (7) for detecting the voltage of electrodes arranged in the other axial direction and transmitting the detection signal to the CPU (2), and as a result, a touch panel (4) In the matrix type touch panel input device (1) whose pressing position is specified, the drive unit (6) is arranged near the end of the touch panel (4) and has electrodes connected to the drive unit (6). A suitable number is provided as one group, and parallel conversion means (8) is provided for each group so that a drive voltage is applied to the electrodes in the group based on an instruction signal from the CPU (2). Matrix type touch panel input device. 2. The driving unit (6) receives one instruction signal from the CPU (2) by connecting parallel conversion means (8) for each group in series. 1. The matrix type touch panel input device according to 1. 3. A plurality of transparent electrodes arranged in the horizontal axis direction and the vertical axis direction.
Touch panel (4) with (40) and (41) arranged, and CPU (2)
According to an instruction from the CPU (2), a voltage is applied to the drive unit (6) that applies a drive voltage to the electrodes arranged in one axial direction, and the voltage of the electrodes arranged in the other axial direction is detected, and the detection is performed. A matrix type touch panel input device (1) comprising: an interface section (5) having a detection section (7) for transmitting a signal to a CPU (2), and as a result, a pressed position on a touch panel (4) is specified. The section (7) is arranged near the end of the touch panel (4), and an appropriate number of electrodes connected to the detection section (7) are set as one group, and serial conversion means (9) is provided for each group. , Converts the detection signals at the electrodes in the group to serial signals, and the CPU
A matrix type touch panel input device characterized by transmitting to (2). 4. The serial conversion means (9) for each group is connected in series, whereby the detection signal is transmitted as one serial signal from the detection section (7) to the CPU (2). The matrix type touch panel input device according to claim 3. 5. The drive unit (6) is arranged near the end of the touch panel (4), and an appropriate number of electrodes are connected to the drive unit (6) as one group, and the parallel conversion means is provided for each group. By providing (8), based on the instruction signal from the CPU (2),
The matrix type touch panel input device according to claim 3 or 4, wherein a driving voltage is applied to the electrodes in the group. 6. The driving unit (6) receives one instruction signal from the CPU (2) by connecting parallel conversion means (8) for each group in series. The matrix type touch panel input device according to item 5.