JP2001296963A - Touch panel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a processing time for detecting a touched position. SOLUTION: This touch panel device has a resistant film provided with electrodes at both of its ends in an X direction and a resistant film provided with electrodes at both of its ends in a Y direction. These resistant films are arranged opposing each other and when the panel is touched, the resistant films come into contact with each other to detect the position to which external pressure is applied. In the tough panel device, input detection for deciding whether the penal is touched or not functions also as the detection of the Y- coordinate of the touched position. Namely, when data equivalent to the Y- coordinate exceeds a prescribed threshold, the touching is decided. When the decision is made, the Y-coordinate is stored in a memory and an X-coordinate is detected in addition. Thus, it is not necessary to process input detection, X-coordinate input and Y-coordinate input as separate tasks, thereby at time for processing for detecting the touched position is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel device capable of detecting a touch position based on two resistive films whose resistance values change according to a position (touch position) to which pressure is applied. It is suitable for use as a display device of a navigation system for automobiles.

[0002]

2. Description of the Related Art Conventional touch panel devices are disclosed in Japanese Patent Nos. 2955149, 2775857, 10-105336, and 5-12782.
Japanese Patent Publication No. 7-No.

As disclosed in these conventional publications, the touch panel device comprises a transparent two-layered structure including a resistive film having electrodes formed at both ends in the X direction and a resistive film having electrodes formed at both ends in the Y direction. Is formed. The two resistive films are arranged on a substantially rectangular display surface in a superposed state, and when the user touches the display (that is, the resistive film on the display surface) by the user, the two resistive films are set according to the touch position. In order to change the resistance value, the touch panel device detects the X coordinate and the Y coordinate of the touch position based on the change in the resistance values of the two resistive films. At this time, the X coordinate and the Y coordinate of the touched position are detected after detecting that there is an input by the user in order to prevent the user from being erroneously recognized as having been touched even though the user has not touched. Is to be detected.

[0004]

However, in the touch panel devices disclosed in the above publications, input detecting means for detecting that a user has made an input and means for detecting an X coordinate or a Y coordinate are separately provided. Since the input detection and the coordinate reading are individually performed, the number of processes until the touch position is detected increases. That is, as shown in FIG. 7A, after the input is detected, the processing of inputting the X coordinate and inputting the Y coordinate must be performed by different tasks.

[0005] Normally, the processing section executes various processes in addition to the detection of the touched position. Therefore, only the detection of the touched position is not prioritized. For example, after executing the above-mentioned input detection, after waiting for a predetermined time, executing the X coordinate input,
A processing method of executing the Y coordinate input after waiting for a predetermined time is employed. For this reason, when the number of processes required for touch position detection increases, as shown in FIG. 7B, the time until input detection and all X-coordinate input and Y-coordinate input are executed significantly increases. Increase.

In Japanese Patent Application Laid-Open No. 9-44308, an X coordinate and a Y coordinate are read twice, and each read X coordinate is read.
There has been proposed a touch panel device that determines whether or not a user has made an input by comparing coordinates and Y coordinates.

In this touch panel device, since the input is detected based on the X coordinate and the Y coordinate, it is considered that the means for detecting the X coordinate and the Y coordinate also serves as the input detecting means. The Y-coordinate must be detected twice, and the processing time cannot be reduced.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to reduce processing time for detecting a touch position.

[0009]

According to the first aspect of the present invention, a first resistive film (1a) having electrodes (Xa, Xb) at both ends in a first direction is provided.
And electrodes (Y) at both ends in a second direction different from the first direction.
a, Yb) and a second resistance film (1b) provided with the first and second resistance films (1a, 1b) facing each other. Input detecting means for determining whether or not an external pressure is applied in a touch panel device in which the second resistive films (1a and 1b) come into contact with each other to detect a position where an external pressure is applied. (120) and means (13) for detecting coordinates in the first direction among the positions to which external pressure is applied.
0), and means (160) for detecting the coordinates in the second direction among the positions to which the external pressure is applied, and the input detecting means includes the coordinates in the first direction or the coordinates in the second direction. It is characterized in that it is determined whether or not an external pressure has been applied based on a result of detection of one of the coordinates.

As described above, if it is determined whether or not an external pressure has been applied based on the detection result of either the coordinates in the first direction or the coordinates in the second direction, the input detection Is performed, the process of inputting the coordinates in the first direction and the input of the coordinates in the second direction does not need to be processed by separate tasks. For this reason, the processing time for detecting the position (touch position) to which the external pressure is applied can be reduced.

In this case, the input detecting means detects the coordinates used for the determination before the coordinates not used for the determination, and determines that no external pressure is applied based on the detection result. Then, the coordinates used for the determination may not be detected, but the coordinates used for the determination may be detected again to determine whether the external pressure is applied.

According to a third aspect of the present invention, when the input detecting means detects the coordinates used for the determination before the coordinates not used for the determination, it is determined that the external pressure is applied based on the detection result. It is sufficient to detect coordinates that are not used for the determination, and detect the position to which the external pressure is applied from the coordinates used for the determination and the coordinates not used for the determination.

[0013] In the invention described in claim 4, the first,
Both of the second resistance films (1a, 1b) have a substantially rectangular shape,
The first direction corresponds to the long side direction of the substantially rectangular shape, the second direction corresponds to the short side direction of the substantially rectangular shape, and the input detecting means is configured to detect the coordinates in the second direction based on the detection result of the coordinates in the second direction. It is characterized in that it is determined whether or not an external pressure has been applied.

As described above, if it is determined whether or not an external pressure is applied based on the detection result of the coordinates in the short side direction of the substantially rectangular shape, the amount of change in the output potential per unit length of the resistive film is determined. Since the coordinate detection in the second direction is larger than the coordinate detection in the first direction, input detection can be performed more effectively.

According to a fifth aspect of the present invention, the control means (2) comprises a first electrode (Xa) and a second electrode (Xb).
And the third and fourth electrodes (Ya, Yb) are set in a floating state, and an external pressure is set based on the potential of the third electrode (Ya) or the fourth electrode (Yb). The coordinates in the first direction are detected among the added positions, and a potential difference is formed between the third electrode (Ya) and the fourth electrode (Yb).
In a floating gate state, and based on the potential of the first electrode (Xa) or the second electrode (Xb), the coordinates in the first direction among the positions to which external pressure is applied are detected. Further, it is characterized in that it is determined whether or not an external pressure is applied based on the detection result of either the coordinates in the first direction or the coordinates in the second direction. And

As described above, it is determined whether or not an external pressure is applied based on the result of detection of either the coordinates in the first direction or the coordinates in the second direction. Similar effects can be obtained.

For example, as described in claim 6, a first switch circuit (6) is provided between the first electrode (Xa) and the control means, and a first switch circuit (6) is provided between the second electrode (Xb) and the control means. The third switch circuit (4) and the fourth electrode (Yb) between the second switch circuit (7), the third electrode (Ya) and the control means.
A fourth switch circuit (5) is provided between the first and fourth switch circuits (5 to 7), and a control signal is sent from the control means (2) to the first to fourth switch circuits (4 to 7). By controlling the switching of the switch circuits (4 to 7) of
The potential applied to the first to fourth electrodes (Xa, Xb, Ya, Yb) can be controlled.

Specifically, as set forth in claim 7, the first
When detecting the coordinates in the direction of, the control signal
Input the first signal to the switch circuit (6), and
A second signal different from the first signal is input to the second to fourth switch circuits (7), and the first electrode (Xa) is set to a first potential by the first switch circuit (6); The second electrode (Xb) is set to a second potential (Vcc) different from the first potential by the second switch circuit (7), and the third and fourth switch circuits (4, 5) are used for the third and fourth switch circuits (4, 5). The fourth electrode (Y
a, Yb) are brought into a floating state.

When detecting coordinates in the second direction, a second signal is input to the first switch circuit (6) as a control signal, and a second signal is input to the first switch circuit (6). ~
The first signal is input to the fourth switch circuit (7),
The third electrode (Ya) is set to the third potential by the switch circuit (4), and the fourth electrode is set to the fourth potential by the fourth switch circuit (5).
Electrode (Yb) is set to a fourth potential different from the third potential, and the first and second electrodes (Xa, Xb) are brought into a floating state by the first and second switch circuits (6, 7). .

In the ninth aspect of the present invention, the second to the second aspects
The fourth switch circuit (4, 5, 7) is characterized in that it is connected to the same terminal of the control means.

As described above, by integrating the second to fourth switch circuits (4, 5, 7) controlled by the same signal into the same terminal, the circuit can be simplified.

In the tenth aspect of the present invention, the first
Switch circuit (6) is connected via an inverter circuit (8) to a terminal of the control means (2) to which one of the second to fourth switch circuits (4, 5, 7) is connected. It is characterized by being.

As described above, the first switch circuit (6) in which the control signals of the second to fourth switch circuits (4, 5, 7) are inverted is used as the control signal. ) Can be integrated into the same terminal as the second to fourth circuits. Thus, the circuit can be simplified.

According to the eleventh aspect, both the first and second resistance films (1a, 1b) have a substantially rectangular shape, and the first direction corresponds to a long side direction of the substantially rectangular shape. , Second
Corresponds to a substantially rectangular short side direction, and the control means (2) determines whether or not an external pressure is applied based on a detection result of coordinates in the second direction. Therefore, the same effect as the fourth aspect can be obtained.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG.
2B shows a schematic view of two resistive films 1a and 1b constituting the touch panel unit 1 of the touch panel device, and an equivalent circuit diagram thereof. FIG. 2 shows an overall configuration of a circuit unit used for detecting a touch position. These resistive films (first and second resistive films) constituting the touch panel unit 1 shown in FIG.
A touch panel device is constituted by 1a and 1b and a circuit unit.

As shown in FIG. 1A, two resistive films 1
a and 1b are formed in a substantially rectangular shape similarly to a display (not shown), and are arranged so as to be vertically overlapped and opposed to each other. Assuming that two directions perpendicular to these two resistive films 1a and 1b, that is, the long side direction is the X direction (first direction) and the short side direction is the Y direction (second direction), one of the two films is used. Resistance film 1a
Are electrodes (first and second electrodes) Xa and X at both ends in the X direction.
The other resistance film 1b has electrodes (third and fourth electrodes) Ya and Yb formed at both ends in the Y direction.

Therefore, the two resistive films 1 shown in FIG.
1a and 1b are equivalent to a circuit configuration in which a resistor extending in the X direction and a resistor extending in the Y direction overlap as shown in FIG.

On the other hand, the circuit section inputs a control signal to the touch panel section 1 and detects a touch position.
C (control means) 2 and a peripheral circuit section 3 connecting the control IC 2 and the touch panel section.

Each of the electrodes Ya, Yb, Xa,
Xb is each switch circuit 4 provided in the peripheral circuit unit 3,
It is connected to each terminal of the control IC 2 via 5, 6, and 7. The switching of the switch circuits (third and fourth switch circuits) 4 and 5 is performed based on the control signal from the I / O terminal 2a of the control IC 2, and based on the control signal from the I / O terminal 2b. Switching of the switch circuit (first switch circuit) 6 is performed, and switching of the switch circuit (second switch circuit) 7 is performed based on a control signal from the I / O terminal 2c.

A voltage at a predetermined portion of the switch circuit 4 is output to the A / D terminal 2A of the control IC 2 as data corresponding to the X coordinate, and a voltage at a predetermined portion of the switch circuit 6 is output as data corresponding to the Y coordinate. Is output to the A / D terminal 2B of the control IC 2. The control IC 2 detects the X coordinate based on the output voltage from the switch circuit 4 and detects the Y coordinate based on the output voltage from the switch circuit 6.

Next, a specific method of detecting the X coordinate and the Y coordinate will be described with reference to FIGS.

First, when detecting the X coordinate, the potential of the I / O terminal 2b is set to Hi level, and the I / O terminals 2a and I
The potential of the / O terminal 2c is set to a low level. As a result, the pnp transistor 7a of the switch circuit 7 is turned on, and the power supply voltage (the second potential, here Vcc
= 5V) and npn of the switch circuit 6
The transistor 6a is turned on, and the electrode Xa is almost at the ground potential (first potential). In addition, np of the switch circuit 4
Since both the n-transistor 4a and the npn-transistor 5a of the switch circuit 5 are turned off, both the electrodes Ya and Yb are in a floating state.

The potential at the place where the user touches the resistive film 1a is determined by the resistance from the electrode Xb to the touch position and the resistance from the touch position to the electrode Xa. Therefore, when the user touches the display (that is, the two resistive films), the two resistive films 1
When a and 1b come into contact with each other, the potential of the other resistive film 1b becomes equal to the potential of the portion of the resistive film 1a touched by the user. This potential is used as control IC data as data corresponding to the X coordinate.
2 is input to the A / D terminal 2A and A / D-converted, the X-coordinate can be detected by reading the A / D-converted A / D value.

On the other hand, when detecting the Y coordinate, the potential of the I / O terminal 2b is set to a low level, and the potentials of the I / O terminal 2a and the I / O terminal 2c are set to a high level. As a result, the npn transistor 5a of the switch circuit 5 and the pnp
The transistor 5b is turned on, a power supply voltage (fourth potential, Vcc = 5V in this case) is applied to the electrode Yb, the npn transistor 4a of the switch circuit 4 is turned on, and the electrode Ya is substantially at the ground potential (third potential). Potential).
Further, since both the npn transistor 6a of the switch circuit 6 and the pnp transistor 7a of the switch circuit 7 are turned off, both the electrodes Xa and Xb are in a floating state.

The potential of the resistive film 1b at the place touched by the user is determined by the resistance value from the electrode Yb to the touch position and the resistance value from the touch position to the electrode Ya. Therefore, when the user touches the display (that is, the two resistive films), the two resistive films 1
When a and 1b come into contact with each other, the potential of the other resistive film 1a becomes the same as the potential of the portion of the resistive film 1b touched by the user. This potential is used as control IC data corresponding to the Y coordinate.
2 is input to the A / D terminal 2B and A / D converted, so that the Y coordinate can be detected by reading the A / D converted A / D value.

FIG. 3 shows a flowchart of the control executed by the touch panel device configured as described above. Hereinafter, the control executed by the touch panel device will be described in detail with reference to FIG.

First, as shown in step 100, as the port setting for reading the Y coordinate, the I / O terminal 2b
Of the I / O terminal 2a and the I / O terminal
The potential of the terminal 2c is set to Hi level. Thereby, the potentials of the respective electrodes of the two resistive films 1a and 1b are in the above-described state.

Then, after waiting for a predetermined time, for example, 10 ms, the A / D value obtained by A / D conversion of the potential input to the A / D terminal 2B is read in step 110.
In the following step 120, the read A / D value is compared with a predetermined threshold value K. That is, when an input is made by the user, the two resistance values 1a and 1b come into contact with each other, and the potential of the electrode Xa of the resistance film 1a becomes equal to the potential of the other resistance film 1b at the place touched by the user. This is the same, and this potential is input to the A / D terminal 2B. Therefore, by comparing the A / D value with the threshold value K, it is possible to determine whether or not an input has been made by the user. Therefore, when the A / D value is larger than the threshold value K, it is determined that an input has been made by the user, and the process proceeds to step 130. Conversely, when the A / D value is smaller than the threshold value K, it is determined that there is no input by the user, and the process returns to step 100.

In the following step 130, the A / D value read in step 120 is stored as a Y coordinate in a memory (not shown) provided in the control IC 2, and in step 140
Proceed to.

In step 140, as the port setting for reading the X coordinate, the potential of the I / O terminal 2b is set to Hi level, and the potentials of the I / O terminal 2a and I / O terminal 2c are set to Low level. Thereby, the two resistive films 1a,
The potential of each electrode 1b is in the state described above.

Then, after waiting for a predetermined time, for example, 10 ms, an A / D value obtained by A / D converting the potential input to the A / D terminal 2A is read as shown in step 150.
Subsequently, as shown in step 160, the read A / D value is stored as an X coordinate in a memory provided in the control IC 2, and the process proceeds to step 170. In step 170, the X coordinate and the Y coordinate of the touch position by the user are determined based on the Y coordinate stored in step 130 and the X coordinate stored in step 160.

As described above, in the touch panel device according to the present embodiment, the input detection for detecting whether or not the user has made an input and the Y coordinate detection are performed based on the data corresponding to the Y coordinate. ing. That is, Y
The means for detecting the coordinates also serves as the input detecting means.

Therefore, the processing for detecting the input is performed by Y
This can be performed simultaneously with the coordinate detection processing, and the processing separately required only for input detection as in the related art can be eliminated. As a result, the processing time for detecting the touch position can be reduced.

More specifically, FIG. 4 is a timing chart showing the potential of each terminal when the control of the touch panel device is executed.

As shown in this figure, first, data (A / D value of the A / D terminal 2) corresponding to the Y coordinate is read, and based on the read data, it is determined whether or not the user has made an input. Is detected. Then, when there is an input by the user, data (A / D) corresponding to the X coordinate
The A / D value of the terminal 1 is read.

Therefore, as shown in FIG. 4, it is possible to detect whether or not the user has made an input within the time for performing the Y coordinate detection and the X coordinate detection, thereby shortening the processing time. Can be planned.

If the treatment time can be shortened in this way, even if the user touches the touch panel unit 1 many times, the touch position can be reliably detected each time. The effect that omission of detection of the touch position can be eliminated can also be obtained.

Further, since the input detection processing and the Y coordinate detection processing can be performed at the same time, the load on the control IC 2 can be reduced.

It should be noted that even when there is no input by the user, the time for detecting the Y coordinate (1 in the case of this embodiment).
0 ms), the input can be detected in a short time.

Further, in the present embodiment, the processing for detecting the input is also used as the processing for detecting the Y coordinate. In this case, the processing for performing the input detection is also used as the processing for detecting the X coordinate. Input detection can be performed more effectively than in the case.

This is because the switching circuit 5 and the switching circuit 7
, The distance between the electrodes Ya and Yb of the resistive film 1b used for detecting the Y coordinate is shorter than the distance between the electrodes Xa and Xb of the resistive film 1a used for detecting the X coordinate. Because. That is, the amount of change in the output potential per unit length of the resistive film is larger when detecting the Y coordinate than when detecting the X coordinate.

For this reason, even if the user touches the vicinity of the electrode Ya on the touch panel, the potential can be reliably taken out via the electrode Xa, and the processing for detecting the input is performed by the processing of the X coordinate detection. Compared to the case where
Input detection can be performed more reliably.

(Second Embodiment) FIG. 5 shows the overall configuration of a circuit section used for detecting a touch position in the present embodiment.

As shown in FIG. 5, in this embodiment, the I / O terminal 2a to which the switch circuits 4 and 5 are connected in the circuit section.
Is also connected to the switch circuit 7.

As shown in the flowchart of FIG. 3 in the first embodiment, an I / O terminal 2a for generating an input signal to the switch circuits 4 and 5 and an I / O terminal for generating an input signal to the switch circuit 7 The terminal 2c generates the same signal. That is, as is apparent from the timing chart of FIG. 4 in the first embodiment, the I / O terminals 2a and I / O
The switching timing of the Hi level and the Low level of the signal of the O terminal 2c is synchronized.

Therefore, a terminal for generating an input signal to the switch circuits 4 and 5 and a terminal for generating an input signal to the switch circuit 7 can be shared, and the circuit configuration can be simplified. .

(Third Embodiment) FIG. 6 shows an overall configuration of a circuit section used for detecting a touch position in the present embodiment.

As shown in FIG. 6, in this embodiment, the I / O terminal 2a to which the switch circuits 4 and 5 are connected in the circuit section.
, A switch circuit 7 and an inverter circuit 8
The switch circuit 6 is also connected via the.

As shown in the flowchart of FIG. 3 in the first embodiment, an I / O terminal 2a for generating an input signal to the switch circuits 4 and 5 and an I / O terminal for generating an input signal to the switch circuit 7 The I / O terminal 2b for generating the same signal as that of the switch 2c and the input signal to the switch circuit 6 is connected to the I / O terminal 2b.
A signal is generated by inverting the O terminal 2a and the I / O terminal 2c.

Therefore, if the switch circuit 6 is connected to the I / O terminal 2a via the inverter circuit 8, the terminal for generating the input signals to the switch circuits 4, 5, 7 and the input signal to the switch circuit 6 The terminal to be generated can be shared, and the circuit configuration can be simplified.

(Other Embodiments) In each of the above embodiments, the processing for detecting the input is also used as the processing for detecting the Y coordinate, but may be also used for detecting the X coordinate. However,
As described above, input detection can be performed more reliably if the processing for input detection is also used as the processing for Y coordinate detection.

In the above embodiments, the X coordinate and the Y coordinate detected once are determined as the X coordinate and the Y coordinate of the touch position. However, the X coordinate and the Y coordinate are detected a plurality of times.
The maximum value or the average value of the plurality of times may be determined as the X coordinate and the Y coordinate of the touch position.

[Brief description of the drawings]

FIG. 1A is a schematic view of two resistive films provided in a touch panel device according to a first embodiment of the present invention;
(B) is an equivalent circuit diagram of (a).

FIG. 2 is a diagram illustrating an overall configuration of a circuit unit used for detecting a touch position.

FIG. 3 is a diagram illustrating a flowchart of control executed by the touch panel device.

FIG. 4 is a time chart showing the potential of each terminal when control of the touch panel device is executed.

FIG. 5 is a diagram illustrating an overall configuration of a circuit unit used for detecting a touch position according to a second embodiment of the present invention.

FIG. 6 is a diagram illustrating an overall configuration of a circuit unit used for detecting a touch position according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a processing time of touch position detection by a conventional touch panel device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Touch panel part, 1a, 1b ... Resistive film, 2 ... Control I
C, 2a to 2c: I / O terminal, 2A, 2B: A / D terminal, 3: peripheral circuit, 4 to 7: switch circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F063 AA03 BA28 BA30 BB01 BB02 BC09 CA11 DA02 DB05 DD07 FA05 FA16 LA09 LA16 LA17 LA19 LA29 LA30 5B068 AA02 AA11 BB06 BD20 BE08 BE11 5B087 AA01 AE00 CC12 CC26 CC37

Claims (11)

[Claims] An electrode (Xa, Xb) is provided at both ends in a first direction.
A first resistive film (1a) provided with an electrode (Y) at both ends in a second direction different from the first direction.
a, Yb) and a second resistance film (1b) provided with the first and second resistance films (1a, 1b) facing each other. 1, the second resistive film (1
a, 1b) are in contact with each other and are capable of detecting the position where the external pressure is applied; an input detecting means (120) for determining whether or not the external pressure is applied; Means (13) for detecting coordinates in the first direction among the positions to which the external pressure is applied.
0), and means (160) for detecting coordinates in the second direction among the positions where the external pressure is applied, wherein the input detecting means includes coordinates in the first direction, or A touch panel device, wherein it is determined whether or not the external pressure has been applied, based on one of the detection results of the coordinates in the second direction. 2. The method according to claim 1, wherein the input detection means detects coordinates used for the determination before coordinates not used for the determination, and determines that the external pressure is not applied based on a result of the detection. Without detecting the coordinates not used for the determination, again,
The touch panel device according to claim 1, wherein coordinates used for the determination are detected to determine whether the external pressure is applied. 3. The input detecting means detects coordinates used for the determination before coordinates not used for the determination, and when it is determined that the external pressure is applied based on a result of the detection, the determination is performed. The coordinates that are not used for the detection is performed, and the coordinates used for the determination and the coordinates that are not used for the determination are used to detect the position where the external pressure is applied. The touch panel device according to claim 1. 4. The first and second resistance films (1a, 1b).
Both have a substantially rectangular shape, the first direction corresponds to a long side direction of the substantially rectangular shape, and the second direction corresponds to a short side direction of the substantially rectangular shape. The touch panel device according to any one of claims 1 to 3, wherein the means determines whether or not the external pressure is applied based on a detection result of the coordinates in the second direction. 5. A first resistive film (1) disposed opposite to each other.
a) and a second resistance film (1b); first and second electrodes (Xa, Xb) provided at both ends in a first direction of the first resistance film (1a); Third and fourth electrodes (Ya, Yb) provided on both sides of the second resistance film (1a) in the second direction; and the first to fourth electrodes (Xa, Xb, Ya, Yb). Control means (2) for controlling a potential applied to the first and second resistive films (1) when an external pressure is applied.
a, 1b) are in contact with each other to detect the position to which the external pressure is applied. The control means (2) comprises: the first electrode (Xa) and the second electrode (Xa). A potential difference is formed between the third electrode (Xb) and the third electrode (Yb), and the third and fourth electrodes (Ya, Yb) are brought into a floating state. Based on the potential, the coordinates in the first direction among the positions to which the external pressure is applied are detected, and the potential difference between the third electrode (Ya) and the fourth electrode (Yb) is detected. At the same time, the first and second electrodes are brought into a floating gate state, and the first electrode (X
a) or detecting the coordinates in the first direction among the positions to which the external pressure is applied, based on the potential of the second electrode (Xb); A touch panel device configured to determine whether or not the external pressure has been applied, based on a detection result of either the coordinate in the second direction or the coordinate in the second direction. 6. A first switch circuit (6) between said first electrode (Xa) and said control means, and a second switch circuit (6) between said second electrode (Xb) and said control means. A third switch circuit (4) and a fourth electrode (Y) between the third electrode (Ya) and the control means.
b) and a fourth switch circuit (5) are provided between the control means and the control means, respectively. The control means (2) controls the first to fourth switch circuits (4 to 7). By sending a signal and controlling the switching of the first to fourth switch circuits (4 to 7),
The touch panel device according to claim 5, wherein a potential applied to the first to fourth electrodes (Xa, Xb, Ya, Yb) is controlled. 7. The control means (2) inputs a first signal to the first switch circuit (6) as the control signal when detecting coordinates in the first direction. A second signal different from the first signal is input to the second to fourth switch circuits (7), and the first signal is input to the first switch circuit (6). And setting the first electrode (Xa) to a first potential, and the second switch circuit (7), when the second signal is input, sets the second electrode (Xb) to the first potential. A second potential (Vcc) different from the first potential, and the third and fourth switch circuits (4, 5)
Is input, the third and fourth electrodes (Ya,
The touch panel device according to claim 6, wherein Yb) is set in a floating state. 8. The control means (2) inputs the second signal to the first switch circuit (6) as the control signal when detecting the coordinates in the second direction. And the first to fourth switch circuits (7) are connected to the first switch circuit (7).
The third switch circuit (4) sets the third electrode (Ya) to a third potential when the first signal is input, and sets the fourth switch circuit ( 5) setting the fourth electrode (Yb) to a fourth potential different from the third potential when the first signal is input, and the first switch circuit (6) When the second signal is input, the first electrode (Xa) is set in a floating state. When the first signal is input, the fourth switch circuit (7) switches the second electrode (Xa) to the second electrode. The touch panel device according to claim 7, wherein (Xb) is set to a floating state. 9. The second to fourth switch circuits (4,
9. The touch panel device according to claim 7, wherein (5) and (7) are connected to the same terminal of the control unit. 10. The first switch circuit (6) is connected to the second to fourth switch circuits (4, 5, 7) of the control means (2) via an inverter circuit (8). 10. The touch panel device according to claim 7, wherein one of the terminals is connected to a connected terminal. 11. The first and second resistance films (1a, 1a).
b) both have a substantially rectangular shape, wherein the first direction corresponds to a long side direction of the substantially rectangular shape, and the second direction corresponds to a short side direction of the substantially rectangular shape. The control means (2) determines whether or not the external pressure is applied based on a result of detection of coordinates in the second direction, according to any one of claims 5 to 10, wherein: Touch panel device.