JP2001034417A - Resistance film type touch panel and coordinate detecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce any erroneous operation by detecting that there are more than one depressed part of a touch panel. SOLUTION: A touch panel is constituted by arranging an upper panel 15 having a pair of resistance films 11 and 12 arranged so as to be faced to each other and a lower panel 16 having a pair of resistance films 13 and 14 arranged so as to be faced to each other in parallel. When the touch panel is depressed, the resistance films 11 and 13 are respectively brought into contact with the resistance films 12 and 14 at the depressed position. A coordinate detecting circuit repeatedly detects the coordinate of the contact position of the first and second resistance films 11 and 12 and the coordinate of the contact position of the third and fourth resistance films 13 and 14. The coordinate detecting circuit compares the coordinate of the upper panel 15 with the coordinate of the lower panel 16, and judges that there are more than one depressed part on the touch panel when those coordinates are not made coincident with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resistive touch panel and a coordinate detecting method, and more particularly, to a resistive touch panel and a coordinate detecting method capable of detecting a multiple press.

[0002]

2. Description of the Related Art As shown in FIG. 5, a resistive touch panel includes a pair of resistive films X and Y arranged opposite to each other. It has a structure where X and Y are in contact. Further, electrodes Y0 and Y1 are formed in parallel on the upper side and the lower side of the resistance film Y, respectively. The electrodes X0 and X are located on the left and right sides of the resistance film X, respectively.
1 is formed so as to be orthogonal to the electrodes Y0 and Y1 of the resistance film Y.

The electrode X0 is connected to a voltage VCC via a transistor Tr1, the electrode X1 is grounded via a transistor Tr3, and a contact portion (Y coordinate) between the resistive films X and Y.
Is connected to a detection circuit for detecting The electrode Y0 is connected to the voltage VCC via the transistor Tr2, and the electrode Y1 is grounded via the transistor Tr4 and connected to a detection circuit for detecting a contact portion (X coordinate) between the resistive films X and Y. ing.

In the resistive touch panel constructed as described above, when detecting the X coordinate of the pressed position, the transistors Tr1 and Tr3 in FIG. 5 are turned on and the transistors Tr2 and Tr4 are turned off. As a result, the voltage VCC is applied to the electrode X0, and the electrode X1 is grounded.

[0005] In this state, any point on the touch panel,
For example, when the point A is pressed, the resistance films X and Y
Touch at a point. At this time, the voltage VAX at the point A has the value shown in Expression 1 assuming that the input impedance of the coordinate detection circuit is sufficiently large.

[0006]

VAX = VCC * XA / LX where LX: value proportional to the distance between electrode X0 and electrode X1 XA: value proportional to the distance between electrode X0 and point A

The X coordinate XA of the point A on the touch panel can be obtained from Equation 2 obtained by transforming Equation 1.

[0008]

XA = (VAX / Vcc) * LX

On the other hand, when detecting the Y coordinate of the pressed position (point A), the transistors Tr1 and Tr3 in FIG. 5 are turned off and the transistors Tr2 and Tr4 are turned on. As a result, the voltage VCC is applied to the electrode Y0, and the electrode Y1 is grounded.

At this time, the voltage VAY at the point A is given by the following equation (3) if the input impedance of the coordinate detection circuit is sufficiently large.
It becomes the value shown in.

[0011]

VAY = VCC * YA / LY where LY is a value proportional to the distance between electrode Y0 and electrode X1 YA: a value proportional to the distance between electrode Y0 and point A

The Y coordinate YA of the point A on the touch panel can be obtained from the equation (4) obtained by transforming the equation (3).

[0013]

## EQU4 ## YA = (VAY / VCC) * LY

[0014]

However, in the conventional resistive touch panel, when there are many pressed positions (in the case of multiple pressing), it is as if the positions of the centers of gravity of the plurality of pressed positions were pressed. In some cases, it was determined. For example, in FIG. 5, a point A (XA, YA) and a point B (X
B, YB), the coordinates C of the center of gravity of both points
((XA + XB) / 2, (YA + YB) / 2) may be erroneously determined to have been pressed. For this reason,
In some cases, the operation is different from the operation intended by the operator.

The present invention has been made in view of the above circumstances, and has as its object to provide a resistive touch panel and a coordinate detection method capable of detecting multiple presses.
Another object of the present invention is to provide a resistive touch panel and a coordinate detection method capable of suppressing malfunction due to multiple pressing by detecting multiple pressing.

[0016]

In order to achieve the above object, a resistive touch panel according to a first aspect of the present invention comprises a pair of flexible resistive films that contact each other at a pressed position. A second panel comprising a pair of flexible resistive films laminated on the first panel, pressed through the first panel, and in contact with each other at a pressed position. A first panel coordinate detecting means for detecting coordinates of a contact position between the pair of resistive films of the first panel, and a second panel for detecting coordinates of a contact position of the pair of resistive films of the second panel. The coordinate detection means compares the coordinates detected by the first panel coordinate detection means with the coordinates detected by the second panel coordinate detection means. Judge that there are multiple pressing locations And a plurality pressing discriminating means, characterized in that.

When a plurality of points on the touch panel are pressed, at a certain pressed point, the pair of resistive films of the first panel are in contact with each other but the pair of resistive films of the second panel are not. appear. In this state, the first
The coordinates detected by the panel coordinate detecting means are different from the coordinates detected by the second panel coordinate detecting means. Therefore, the coordinates detected by the first panel coordinate detecting means and the coordinates detected by the second panel coordinate detecting means are compared, and when the two coordinates do not match, it is determined that there are a plurality of pressed locations. be able to.

[0018] A contact detecting means for detecting that the pair of resistive films of the second panel have come into contact with each other may be further provided. In this case, the plurality of press discriminating means detects that the pair of resistive films of the second panel are in contact with each other by the contact detecting means, and determines the coordinates detected by the first panel coordinate detecting means and the coordinates of the second panel. Only when the coordinates detected by the second panel coordinate detecting means do not match, it is determined that there are a plurality of pressed locations.

Even when one point of the touch panel is pressed, a state occurs in which only the first panel is pressed and the second panel is not pressed momentarily, and the first panel coordinate detecting means and the first panel coordinate detecting means are pressed. The detected coordinates with the second panel coordinate detecting means do not match. According to this configuration, since multiple pressing is detected only when the pair of resistive films of the second panel are in contact with each other, in such a case, it is possible to prevent a situation in which multiple pressing locations are erroneously detected. it can.

The first panel coordinate detecting means and the second panel coordinate detecting means;
The panel coordinate detecting means repeatedly detects, for example, coordinates of contact points of a pair of resistive films of a corresponding panel at substantially the same timing. In this case, for example, the multiple-press determining means compares the detected coordinates of the first panel coordinate detecting means with the detected coordinates of the second panel coordinate detecting means at substantially the same timing.

According to a second aspect of the present invention, there is provided a coordinate detection method for a resistive touch panel, comprising the steps of: first and second panels each having a pair of flexible resistive films disposed opposite to each other; A contact position of a pair of resistive films of a first panel and a pair of resistive films of a second panel of a touch panel, which are configured to be arranged in parallel and are sequentially contacted at a deformed portion by the resistive film deformed by being depressed by pressing. A first panel coordinate detecting step of detecting a coordinate of a contact position of a pair of resistive films of the first panel, which are in contact with each other by pressing, and a method of detecting a contact position of the first panel. A second panel coordinate detecting step of detecting a coordinate of a contact position of the pair of resistive films of the second panel contacted by pressing the resistive film, and a coordinate detected in the first panel coordinate detecting step;
A plurality of pressing determination steps of comparing the coordinates detected in the second panel coordinate detection step with each other, and determining that there is a plurality of pressing locations in the first panel when the two do not match. And

When a plurality of points on the touch panel are pressed, at a certain pressed point, the pair of resistive films of the first panel are in contact with each other, but the pair of resistive films of the second panel are not. Occurs. In this state, the first
The detected coordinates of the second panel are different from the detected coordinates of the second panel. Therefore, the coordinates of the pressed position of the first panel and the coordinates of the pressed position of the second panel are compared, and if the coordinates do not match, it can be determined that there are a plurality of pressed locations.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a resistive touch panel system according to an embodiment of the present invention will be described with reference to the drawings. The resistive touch panel system according to the present embodiment includes a touch panel 1, a data processing unit 2, and a display device 3, as shown in FIG.

As shown in FIG. 1, the touch panel 1 includes a position detection unit 101 and a signal processing unit 102.

As shown in FIG. 2, the position detecting section 101
First to fourth resistance films 11 to 14 each formed of a flexible transparent resistance film;
r8. First to fourth resistive films 11 to 14
Are stacked one after another at regular intervals.
A transparent insulating film 19 is disposed between the second resistance film 12 and the third resistance film 13. Also, the first resistance film 11
A transparent protective film (not shown) for protecting the first resistive film 11 is disposed on the upper surface. First and second resistive films 1
Reference numerals 1 and 12 constitute an upper panel 15 for detecting a pressed portion of the transparent protective film, and third and fourth resistive films 13 and 14 constitute a lower panel 16 for detecting the pressed portion. .

When the touch panel 1 is pressed, the first resistive film 11 bends at the pressing portion, and the first resistive film 1
The first and second resistance films 12 come into contact with each other. The lower panel 16 is also pressed via the upper panel 15, and the third resistance film 13 and the fourth resistance film 14 come into contact.

Electrodes 15Y0 and 15Y1 are formed in the longitudinal direction on the upper side and the lower side of the first resistance film 11.
An electrode 15X is provided on the left side and the right side of the second resistance film 12.
0, 15X1 are formed so as to be orthogonal to the electrodes 15Y0, 15Y1. The electrode 15X0 is a transistor Tr
1 is connected to the supply line of the voltage VCC through the electrode 15X1.
Is grounded via a transistor Tr3 and is connected to an upper panel A / D converter 21 of the signal processor 102, which will be described later. The electrode 15Y0 is connected to the supply line of the voltage VCC via the transistor Tr2, the electrode 15Y1 is grounded via the transistor Tr4, and the signal processing unit 1
02 is connected to an upper panel A / D converter 21 described later.

Electrodes 16Y0 and 16Y1 are formed on the upper and lower sides of the third resistance film 13 in the longitudinal direction.
An electrode 16X is provided on the left side and the right side of the fourth resistance film 14.
0, 16X1 are formed so as to be orthogonal to the electrodes 16Y0, 16Y1. The electrode 16X0 is a transistor Tr
5 is connected to the supply line of the voltage VCC via the electrode 16X1
Is grounded via a transistor Tr7 and connected to a lower panel A / D converter 22 of the signal processing unit 102, which will be described later. The electrode 16Y0 is connected to the supply line of the voltage VCC via the transistor Tr6, the electrode 16Y1 is grounded via the transistor Tr8, and the signal processing unit 1
02 is connected to a lower panel A / D converter 22 described later.

Transistors Tr1, Tr3, Tr5, T
r7 and transistors Tr2, Tr4, Tr6, Tr8
Is controlled by a later-described coordinate detection circuit 23 of the signal processing unit 102, and is alternately turned on / off at a predetermined timing.

The signal processing unit 102 includes an upper panel A / D converter 21, a lower panel A / D converter 22, and a coordinate detection circuit 23.

The upper panel A / D converter 21 A / D converts the voltages of the electrodes 15X1 and 15Y1 of the upper panel 15 and supplies the converted digital value to the coordinate detection circuit 23.

The lower panel A / D converter 22 A / D converts the voltages of the electrodes 16X1 and 16Y1 of the lower panel 16 and supplies the converted digital value to the coordinate detecting circuit 23.

The coordinate detecting circuit 23 controls the entire operation of the touch panel 1. For example, transistors Tr1 and TR
3, Tr5, Tr7 and transistors Tr2, TR4, T
r6 and Tr8 are alternately turned on / off at a predetermined cycle,
Digital values of the voltages of the electrodes 15X1, 15Y1, 16X1, and 16Y1 are acquired, and the coordinates (XH, YH) of the pressed point on the upper panel 15 and the coordinates (XL, YL) of the pressed point on the lower panel 16 are obtained from the acquired digital values. ) Is calculated.
The coordinate detection circuit 23 determines whether or not the calculated coordinates (XH, YH) and (XL, YL) match, that is, whether or not the operator has performed multiple presses, and the obtained coordinates match. In this case, the matched coordinates (X, Y) are supplied to the data processing unit 2. On the other hand, if the two acquired coordinates do not match, a multiple press detection signal is supplied to the data processing unit 2.

The data processing unit 2 executes a predetermined process based on various data supplied from the signal processing unit 102. For example, a predetermined program is executed based on the coordinate data (the signal input position of the operator) supplied from the signal processing unit 102, and the display is performed on the display device 3.

The display device 3 is composed of, for example, a liquid crystal display device, is disposed below the fourth resistive film 14 of the touch panel 1, and operates in accordance with a control signal supplied from the data processing unit 2.
Display an image on the display screen.

Next, a method of detecting coordinates of the touch panel 1 having the above configuration will be described with reference to a flowchart shown in FIG.

The coordinate detection circuit 23 includes a transistor Tr
1, TR3, TR5, TR7 and the transistor Tr2
TR4, TR6 and TR8 are transmitted at a predetermined cycle (for example, 5
It is turned on / off alternately at a cycle of 0 ms to 200 ms).

When the transistors Tr1, TR3, TR5, and TR7 are turned on, the upper panel A / D converter 21 A / D converts the voltage of the electrode 15Y1 of the upper panel 15 and outputs a digital value DHX. When the transistors Tr2, TR4, TR6, and TR8 are turned on, the voltage of the electrode 15X1 of the upper panel 15 is A / D converted and a digital value DHY is output. The lower panel A / D converter 22 includes transistors Tr1 and T
At the timing when R3, TR5 and TR7 are on,
A / D converting the voltage of the electrode 16Y1 of the lower panel 16;
A digital value DLX is output, and transistors Tr2 and T2 are output.
At the timing when R4, TR6 and TR8 are on,
A / D converting the voltage of the electrode 16Y1 of the lower panel 16;
The digital value DLY is output.

The coordinate detecting circuit 23 includes a transistor Tr1
The process shown in the flowchart of FIG. 3 is started in each cycle of ON / OFF of TR8. First, the coordinate detection circuit 23
Are the upper panel A / D converter 21 and the lower panel A / D
The digital values DHX, DL supplied from the converter 22
X, DHY, and DLY are fetched, and X coordinates XH and XL and Y coordinates YH and Y of the pressed position are obtained from the fetched digital values.
L is calculated according to Equations 5 and 6 similar to Equations 2 and 4 described above (Step S1).

[0040]

XH = (DHX / DVCC) * LX XL = (DLX / DVCC) * LX where XH is the X coordinate of the pressed position of the top panel 15, X
L: X coordinate of the pressed position of lower panel 16, LX: Maximum value of X coordinate of upper panel 15 and lower panel 16, DVCC:
Digital value of voltage VCC

[0041]

YH = (DHY / DVCC) * LY YL = (DLY / DVCC) * LY where YH is the Y coordinate of the pressed position of the upper panel 15, Y
L: Y coordinate of the pressed position of the lower panel 16, LY: Maximum value of the Y coordinate of the upper panel 15 and the lower panel 16, DVCC:
Digital value of voltage VCC

The coordinate detection circuit 23 calculates the coordinates (XL, YL) of the pressed position on the lower panel 16 among the calculated coordinates.
Is (0, 0).

The coordinates (XL, YL) on the lower panel 16 become (0, 0) because the touch panel 1 is not pressed at all or, as illustrated in FIG. This is the time when the panel 16 is not pressed. Therefore, when the coordinates (0, 0) are calculated in the determination in step S2, the coordinate detection circuit 23 outputs a non-touch signal indicating that the touch panel 1 is not touched (step S5), and The coordinate detection processing ends.

On the other hand, the coordinates (XL, Y
If (L) is other than (0, 0), it is determined whether or not the acquired coordinates of the pressed position of the upper panel 15 and the coordinates of the pressed position of the lower panel 16 match, that is, (XH, YH) = ( X
(L, YL) (step S3).

If the two coordinates do not match in the determination in step S3, as shown in FIG.
Is in the process of being pressed at a plurality of positions, that is, the state of multiple pressing. Therefore, the coordinate detection circuit 23 supplies the multiple press detection signal to the data processing unit 2 (Step S).
6), end the current coordinate detection processing.

On the other hand, the coordinate detection circuit 23 determines in step S3
If it is determined that the two coordinates match, the matched coordinates (X, Y) are output to the data processing unit 2 (step S).
4), end the current coordinate detection process.

The data processing unit 2 receives the above-described step S from the coordinate detection circuit 23 in response to the pressing operation of the touch panel 1.
Signals output in steps S4, S5, S6 and the like are received, and processing according to the received data is executed.

As described above, the touch panel 1 according to the embodiment of the present invention can detect multiple presses by an operator or the like. Therefore, for example, by displaying an error on the display device 3 when multiple presses are detected,
For example, it is possible to notify the operator of an operation error (multiple pressing). Therefore, it is possible to perform control such as causing the operator to operate the touch panel 1 again.

In the above description, only when the coordinates (XL, YL) of the pressed position of the lower panel 16 are other than (0, 0),
The pressed position of the upper panel 15 and the pressed position of the lower panel 16 are compared to determine whether they match or mismatch. For this reason,
When the touch panel 1 is not reliably pressed, such as when the touch panel 1 is started to be pressed, it is not erroneously determined that multiple touches are performed.

The frequency for detecting the coordinates of the pressed position of the upper panel 15 and the coordinates of the pressed position of the lower panel 16 can be set to any frequency as long as the pressing operation of the operator can be properly detected. .

The resistive touch panel of the present invention is not limited to this embodiment, but can be arbitrarily modified and applied. For example, in the above description, two panels are used, but three or more panels can be used. Further, the configuration of the touch panel 1 can be applied to a resistive film-film type, a glass-glass type, or a glass-film type.

In order to reduce power consumption, the timing for turning off all the transistors Tr1 to Tr8 may be appropriately arranged.

In the above embodiment, in step S2 of FIG. 3, the presence or absence of pressing on the lower panel 16 is determined based on whether or not the detected coordinates (XL, YL) = (0, 0). ing. However, the method of detecting the presence or absence of pressing is not limited to this. For example, the resistance film 14 of FIG.
Voltage VCC is applied to the electrodes 16X0 and 16X1 at the same time,
By detecting the voltage generated at the electrode 16Y1 of the resistive film 13, the presence or absence of pressing can be detected. Electrode 1
By applying the voltage VCC to 6X0 and 16X1, the voltage on the entire surface of the resistive film 14 becomes VCC, and when the resistive film 14 and the resistive film 13 come into contact by pressing, the voltage VCC is generated on the electrode 16Y1 regardless of the contact position. I do. Therefore, by periodically detecting the presence or absence of the voltage VCC by the signal processing unit 102, it is possible to detect the presence or absence of the pressing (the presence or absence of the pressing operation on the touch panel 1).

Further, the power consumption can be reduced by performing the coordinate detection process only when the pressing on the touch panel 1 is detected. For example, 100-500
The presence / absence of pressing is determined every ms, and when it is determined that there is pressing, the coordinate detection process shown in the flowchart of FIG. 3 is executed. In this case, when there is no pressing on the touch panel 1, no current flows from the power supply VCC to the ground via the resistive films 11 to 14. Therefore, power consumption in a state of waiting for pressing can be suppressed. In this case,
Steps S2 and S5 in FIG. 3 can be omitted.

Further, the processing shown in the flowchart of FIG. 3 may be realized by software or hardware. Further, the configurations of the touch panel 1 of FIG. 1 and the flowchart of FIG. 3 are merely examples, and any configuration can be adopted as long as the intended purpose can be achieved.

In the above description, a liquid crystal display device is used as the display device 3. However, a display device other than the liquid crystal display device can of course be used.

[0057]

As described above, according to the present invention,
In the resistive touch panel, it is possible to detect that there are a plurality of pressed locations.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a resistive touch panel according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a position detection unit in FIG. 1;

FIG. 3 is a flowchart illustrating a coordinate detection method of the resistive touch panel of FIG. 1;

FIG. 4 is a diagram for explaining multiple pressing.

FIG. 5 is a configuration diagram of a conventional resistive touch panel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 touch panel 2 data processing unit 3 display device 11 to 14 resistive film 15 top panel 16 bottom panel 21 top panel A / D conversion unit 22 bottom panel A / D conversion unit 23 coordinate detection circuit 101 position detection unit 102 signal processing unit

Claims (4)

[Claims] A first panel formed of a pair of flexible resistive films that come into contact with each other at a pressed position; and a first panel laminated on the first panel and pressed through the first panel. A second panel composed of a pair of flexible resistive films that come into contact with each other at a pressing position, and a first panel coordinate detecting unit that detects coordinates of a contact position between the pair of resistive films of the first panel. Second panel coordinate detecting means for detecting coordinates of a contact position between the pair of resistive films of the second panel; coordinates detected by the first panel coordinate detecting means; and second panel coordinates. A plurality of pressing determining means for comparing the coordinates detected by the detecting means with each other, and in the case of a mismatch, determining that there are a plurality of pressing locations in the first panel. . 2. The apparatus according to claim 1, further comprising: contact detecting means for detecting that a pair of resistive films of said second panel have come into contact with each other.
Detecting that the pair of resistive films of the panel have come into contact with each other, and when the coordinates detected by the first panel coordinate detecting means do not match the coordinates detected by the second panel coordinate detecting means. The resistive touch panel according to claim 1, wherein it is determined that there are a plurality of pressed locations. 3. The first panel coordinate detecting means and the second panel coordinate detecting means.
The panel coordinate detecting means repeatedly detects the coordinates of the contact point of the pair of resistive films of the corresponding panel at substantially the same timing. The plurality of pressing determining means includes the first panel coordinate detecting means and the first panel coordinate detecting means. 3. The resistive touch panel according to claim 1, wherein coordinates detected by the second panel coordinate detecting unit and the coordinates detected at substantially the same timing are compared. 4. 4. A structure in which a first panel and a second panel each having a pair of flexible resistive films arranged opposite to each other are arranged in parallel, and said resistive film deformed by being bent by pressing is deformed. And detecting a contact position of a pair of resistive films of a first panel and a contact position of a pair of resistive films of a second panel of the touch panel, the first contact being made by pressing the first touch panel. A first panel coordinate detecting step of detecting coordinates of a contact position of the pair of resistive films of the panel, and a pair of resistive films of the second panel contacted by pressing the resistive film of the first panel. A second panel coordinate detecting step of detecting coordinates of the contact position; comparing the coordinates detected in the first panel coordinate detecting step with the coordinates detected in the second panel coordinate detecting step; In the case of a mismatch, Multiple comprising pressing determination step and the coordinate detection method of the resistance film type touch panel which is characterized by determining the pressing position there are a plurality in the panels.