JP2003173238A - Touch sensor and display device with touch sensor - Google Patents

Touch sensor and display device with touch sensor

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Publication number
JP2003173238A
JP2003173238A JP2001371246A JP2001371246A JP2003173238A JP 2003173238 A JP2003173238 A JP 2003173238A JP 2001371246 A JP2001371246 A JP 2001371246A JP 2001371246 A JP2001371246 A JP 2001371246A JP 2003173238 A JP2003173238 A JP 2003173238A
Authority
JP
Japan
Prior art keywords
touch sensor
transparent conductive
conductive film
coordinate
input point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001371246A
Other languages
Japanese (ja)
Inventor
Saburo Miyamoto
Toshitake Nakano
敏剛 中野
三郎 宮本
Original Assignee
Sharp Corp
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp, シャープ株式会社 filed Critical Sharp Corp
Priority to JP2001371246A priority Critical patent/JP2003173238A/en
Priority claimed from EP10178969A external-priority patent/EP2261777A1/en
Publication of JP2003173238A publication Critical patent/JP2003173238A/en
Application status is Pending legal-status Critical

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide an analog electrostatic capacity coupling system touch sensor having a simple conductive pattern, and capable of highly accurately detecting a position, and a display device using this touch sensor. <P>SOLUTION: This touch sensor detects an input point from an external part in an operation plane expanding in the X direction and the Y direction by an electrostatic capacity coupling system. This touch sensor has a first transparent conductive film arranged in parallel to the operation plane, and electrically connected to a Y coordinate detecting conductive part for detecting Y directional coordinates of the input point, a second transparent conductive film arranged so as to be opposed to the first transparent conductive film, and electrically connected to the Y coordinate detecting conductive part for detecting the Y directional coordinates of the input point, a dielectric layer arranged between the first transparent conductive film and the second transparent conductive film, and a switching circuit for impressing voltage on selected one of the first transparent conductive film and the second transparent conductive film. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a pen on an operation surface,
Input by finger, infrared, ultrasonic, electromagnetic induction, etc.
Sensor capable of detecting a touched position and the same
And a display device using the same. [0002] 2. Description of the Related Art Touch sensors or touch panels are
Detects the location where a touch was made with a pen or pen
Input device. As the position detection method, electrostatic
Capacitive coupling method, resistive method, infrared method, ultrasonic method,
And an electromagnetic induction / coupling system are known. The current mainstream analog resistive film type
As shown in FIG. 7, the touch sensor sandwiches the air layer 13
Two opposing transparent resistance films 12 and 14 and a transparent resistance film 1
P provided on the side opposite to the air layer 13 of
It has an ET film 11 and a glass film 15. Also two
Y of the transparent resistance film 12 of the transparent resistance films 12 and 14 of FIG.
A pair of conductive portions 16 spaced apart in the axial direction is provided,
The other transparent resistance film 14 has a pair of conductors separated in the X-axis direction.
An electric section 17 is provided. In addition, the transparent resistive film 12
An electric part 17 is provided, and a conductive part 16 is provided on the transparent resistance film 14.
Is also good. In such a touch sensor, a finger or the like is operated.
When touching the work surface, this contact point (press point)
The resistance films 12 and 14 come into contact with each other and conduct. At this time,
A potential difference is provided between the pair of conductive portions 16 of the transparent resistance film 12.
However, no voltage is applied to the transparent resistance film 14.
The voltage at the contact point is detected by the transparent resistance film 14.
Will be issued. From the voltage detected by the transparent resistance film 14,
The Y coordinate of the contact point is detected. Below is a specific example
explain. For example, in the conductive portion 16 of the transparent resistance film 12,
0 V is applied to one of the conductive parts and 5 V is applied to the other conductive part,
A potential gradient is provided in the transparent resistance film 12. For the transparent resistance film 14
Do not apply a voltage. At this time, for example, transparent resistance
When the center of the film 12 is contacted, the transparent resistance film 14
2.5 V, which is 1/2 of 5 V, is detected. Also mark 5V
When a point close to the applied conductive portion is contacted, the transparent resistance film 14
A voltage close to 5 V is detected. Also, mark 0V
A point close to the applied (no voltage applied) conductive part is touched
And a voltage close to 0 V is detected in the transparent resistance film 14.
You. Thus, from the voltage detected by the transparent resistance film 14,
The Y coordinate of the contact point is detected. As in the detection of the Y coordinate, the X
When detecting coordinates, a pair of conductive layers of the transparent resistive film 12 are used.
A potential difference is provided between the portions 17 and the transparent resistance film 12
Has no voltage applied to it, and the voltage at the contact point is
It is detected by the transparent resistance film 12. The above X coordinate
By switching between detection and Y coordinate detection,
The XY coordinates are detected, and the position of the pressed point is detected. With this analog resistive touch sensor,
Makes the two transparent resistance films 12 and 14 conductive at the pressing point.
Therefore, an air layer 13 is provided between the two transparent resistance films 12 and 14.
Is provided. When the air layer 13 exists, the transparent resistance
Due to the difference in the refractive index between the films 12 and 14 and the air layer 13,
Reflection occurs at the interface between the light resistance films 12, 14 and the air layer 13.
You. Since there are two transparent resistive films, reflection occurs twice,
Due to the reflection, the transmittance of the touch sensor decreases. Therefore
Display on the image display device incorporating the touch sensor
Problem. Note that such a touch sensor is actually
It is disclosed in Japanese Unexamined Patent Publication No. Hei 5-4256. On the other hand, Japanese Patent Publication No. 56-500230
Of the analog capacitance type as disclosed in
The touch sensor is configured using one resistive film. Obedience
Therefore, compared to the analog resistive touch sensor described above,
Can also improve the transmittance. This analog capacitance type touch sensor
, Voltages are supplied from the four corners of the transparent resistive film. Transparent resistance
When a certain position of the film is pressed with a finger, the four corners of the transparent resistance film
Current flows from the The current at each of these four corners was measured.
By setting, the X and Y coordinates of the contact point are
Is detected. [0009] [Problems to be solved by the invention]
Analog static disclosed in JP-A-56-500230.
X-coordinate of the contact point like a capacitive touch sensor
In the method of detecting the target and the Y coordinate, the position of the contact point is
Detection error increases, and contact points are detected with high accuracy
There is a problem that can not be. The above-mentioned analog capacitance type touch sensor
Then, in order to correct this, at the end of the transparent resistance film 18
Complex conductive segment pattern 1 as shown in FIG.
9 must be provided. Complicated conductive patterns
And the touch sensor can perform position detection.
There is a problem that the non-effective range becomes large. In the current touch sensor manufacturing industry,
Are mainly analog resistive or analog capacitance
Touch sensors are being manufactured. Therefore analog
A method different from the resistive film method or analog capacitance method
If touch sensors are used, existing manufacturing equipment and materials
May not be able to be manufactured using
There is a problem of rising. The present invention has been made in view of the above circumstances.
Its main purpose is to form complex conductive patterns
Analog that can detect position easily and with high accuracy even without
Touch sensor of capacitive coupling type and its touch
And a display device using the h sensor. [0013] A touch sensor according to the present invention.
Is the outside of the operation surface that extends in the X and Y directions.
Input point is detected by the capacitive coupling method.
Touch sensor. The touch sensor of the present invention,
Placed parallel to the operating surface and before the input point
Conductive part for detecting Y coordinate for detecting coordinates in Y direction
A first transparent conductive film electrically connected to the first transparent conductive film;
The input port is disposed so as to face the conductive film, and
Y-coordinate detection conductor for detecting the Y-direction coordinates of the component
A second transparent conductive film electrically connected to the first transparent conductive portion;
A dielectric provided between the bright conductive film and the second transparent conductive film;
Body layer, the first transparent conductive film and the second transparent conductive film
Switching circuit that applies a voltage to one of the selected
And road. In a preferred embodiment, the switch
Electrical conduction of the first transparent conductive film by a switching circuit
And the electrical conduction of the second transparent conductive film are alternately switched.
available. In a preferred embodiment, the input point
Of the current flowing between the
From the size, the coordinates of the input point in the Y direction
The input point and the X-coordinate detection conductive portion
From the magnitude of the current flowing between
A detection circuit for obtaining coordinates in the X direction is further provided. In a preferred embodiment, the Y coordinate detection
The output conductive portion is provided on the first transparent conductive film.
And at least two conductive portions separated in the Y direction.
The X-coordinate detecting conductive portion is formed of the second transparent conductive film.
Provided at least and separated in the X direction
It has two conductive parts. The dielectric layer is made of polyethylene terephthala
Can be formed from the sheet. Further, the dielectric layer is formed of glass.
It may be. In a preferred embodiment, the first transparent conductive material
Of the film or the second transparent conductive film on the side opposite to the dielectric layer side
Glass is provided on the main surface, and the input is performed through the glass.
Points are awarded. The display device with a touch sensor according to the present invention
The touch sensor described above and the touch sensor
Display element. [0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of the touch sensor according to the present invention will be described. The touch sensor 10 of the present embodiment has a two-dimensional
In other words, in the operation surface extending in the X direction and the Y direction
Input point from the outside in the capacitive coupling method
Therefore, it is detected. Input is operated with a finger or conductive pen
By touching the surface, or infrared, ultrasonic,
Non-contact type such as electromagnetic induction type
Is also performed. In the following description, for example, a finger or conductive pen
An input point is given by touching the operation surface with
The following describes the case where FIG. 1 shows the structure of the touch sensor 10.
It is a perspective view which shows a structure typically. As shown in FIG. 1, the touch sensor 10
Parallel transparent conductive film (transparent resistive film), that is, parallel to the operation surface
Transparent conductive film 2 and first transparent conductive film
A second transparent conductive film 4 arranged to face
Dielectric layer 3 provided between these transparent conductive films 2 and 4
And a switching circuit (not shown). In addition, invitation
The electric body layer 3 is formed from an insulating material. If necessary, the first transparent conductive film 2
The main surface opposite to the surface on which the dielectric layer 3 is provided is
A lath 1 is provided. Thus, the glass 1 was provided.
In this case, a finger or a conductive pen is placed on the operation surface of the touch sensor 10.
Prevents touch sensor 10 from being damaged in direct contact
Can also reduce the reflectivity
You. In the touch sensor 10 of FIG. 1, the main surface of the glass 1 is operated.
Surface, for example, a finger or pen touches this operation surface
As a result, a contact point is given to the touch sensor 10.
It is. As shown in FIG. 2, the first transparent conductive film 2
Each of the second transparent conductive films 4 detects the coordinates of the contact point.
A conductive part (conductive film pattern) for
You. This conductive part applies a predetermined voltage to the transparent conductive film.
Function as an electrode. Also, this conductive part is, for example,
It is formed by patterning a metal film. A conductive portion provided on the first transparent conductive film 2
Is the Y coordinate detection for detecting the Y coordinate of the contact point
Conductive part 5. The Y-coordinate detecting conductive portion 5 is provided with a first
Two regions separated in the Y direction on the transparent conductive film 2
It is provided in. On the other hand, provided on the second transparent conductive film 4
Conductive part to detect the X coordinate of the contact point
The X-coordinate detecting conductive portion 6 of FIG. This conductive for X coordinate detection
The part 6 is separated from the second transparent conductive film 4 in the X direction.
Provided in two regions. It should be noted that the "X direction" and
“Y direction” is a direction defined by a straight line in a strict sense.
Need not be. Flexible touch sensor and display device
When the operation surface is made of a suitable material, the operation surface may be curved.
When the operation surface is not a flat surface but a curved surface
However, the position on the operation surface can be represented by two coordinates X and Y.
Can be. As shown in FIG. 2, the Y coordinate detecting conductive
The part 5 and the conductive part 6 for X coordinate detection are ordinary analog resistors.
Simple pattern similar to the conductive part of the film type touch sensor
have. The pattern of the conductive portions 5 and 6 is shown in FIG.
Of conventional analog capacitive coupling type touch sensor
The configuration is simpler than that of the conductive part. As described above, the touch sensor 1 of the present embodiment
0 has two transparent conductive films 2 and 4 and is conductive for Y coordinate detection.
The part 5 and the conductive part 6 for X-coordinate detection are respectively different transparent conductive parts.
The Y-coordinate detecting conductive portions 5 and
The X-coordinate detecting conductive part 6 is a simple conductive pattern.
Have. Further, the Y-coordinate detecting conductive portion 5 and
The X-coordinate detecting conductive part 6 is a switching circuit (not shown).
It is connected to the. By switching the switching circuit
The conductive part 5 for detecting the Y coordinate and the conductive part 6 for detecting the X coordinate
AC voltage is selectively applied to one of them. Y seat
The mark detecting conductive part 5 and the X coordinate detecting conductive part 6 are
The first transparent conductive film 2 and the second transparent conductive film 4
Connection, the switching circuit
The first transparent conductive film 2 and the second transparent conductive film 4
Either of them is electrically conductive, and the transparent conductive film
The field is formed substantially uniformly. Next, the position of the touch sensor 10 of the present embodiment
The detection method will be described. The position detection employed in the present invention
The basic principle of the method will be described later in detail. For example, the Y coordinate detecting conductive portion 5 and the X coordinate
Selective for the Y-coordinate detection conductive part 5 of the detection conductive part 6
When a voltage is applied to the surface of the glass 1
When a transparent pen or finger touches, the first transparent conductive film 2 is grounded
(Ground plane). At this time, the X coordinate
No voltage is applied to the output conductive portion 6. This capacity is defined as glass 1 and first transparent conductive film.
2 and the volume between human and ground
It is the sum of the quantities. Capacitively coupled contact and first transparent conductive
Electric resistance between the film 2 and the Y-coordinate detecting conductive part 5
Is proportional to the distance between the contact portion and the Y-coordinate detecting conductive portion 5.
For example. Therefore, via the Y-coordinate detecting conductive portion 5,
Proportional to the distance between the contact portion and the Y-coordinate detecting conductive portion 5
Current will flow. Detecting the magnitude of this current
The coordinates of the contact point in the Y direction
You. To find the coordinates of the contact point in the X direction
Is for X coordinate detection by switching the switching circuit
A voltage is selectively applied to the conductive portion 6. At this time, the Y coordinate
No voltage is applied to the conductive part 5 for detection. This allows
The second transparent conductive film 4 is capacitively coupled to the ground (ground plane)
Is done. This capacity is defined as glass 1 and second transparent conductive film.
4 and the volume between human and ground
It is the sum of the quantities. Contact via the conductive part 6 for X coordinate detection
Current proportional to the distance between the portion and the X-coordinate detecting conductive portion 6
Will flow, so detecting the magnitude of this current
You can find the coordinates of the contact point in the X direction
You. As described above, the Y direction and the X direction of the contact point
Direction coordinates are obtained. In the above coordinate detection method, the contact point
Since the Y and X coordinates of the point are detected independently,
A conventional method that detects the Y coordinate and the X coordinate of a touch point at the same time
The detection seems to take longer than the method. Only
Meanwhile, detection of one coordinate can be done in a few milliseconds
Therefore, the time required to detect the Y and X coordinates is
It is short enough compared to human touch gestures,
No. The circuit for connection switching by the switching circuit
The wave number is about several hundred kHz. For this reason, touch the operation surface.
Even when the touch point moves, the moving contact point
Continue to detect the position of the point in near real time
It is possible. For example, the detected position coordinates are stored in the memory.
If stored, the touch sensor 10 can be used as a handwriting input device.
Can be used. Next, with reference to FIG.
The basic principle of the position detection method using the capacitive coupling method is explained.
I will tell. In FIG. 3, for simplicity of explanation, the electrode A
And a one-dimensional resistor sandwiched between electrodes B.
In the touch sensor 10, a transparent conductive material having a two-dimensional spread
Electrofilm 2 or 4 performs the same function as this one-dimensional resistor
I do. Also, a Y-coordinate detecting conductive part having a pair of conductive parts.
5 perform the same function as electrode A and electrode B.
X-coordinate detecting conductive part having a pair of conductive parts
6 perform the same function as electrode A and electrode B.
Conduct. Each of the electrode A and the electrode B has a current-
A resistance r for pressure conversion is connected. The electrodes A and B are
Are connected to the position detection circuit described in (1). Between electrode A and ground, and between electrode B
And the ground, the voltage of the same homologous potential (AC e)
Applied. At this time, the electrodes A and B are always at the same potential.
Therefore, no current flows between the electrode A and the electrode B. It is assumed that the position C is touched with a finger or the like. here
And the resistance from the finger contact position C to the electrode A is R1,Contact
The resistance is R from the touch position C to the electrode B.Two, R = R1+ RTwoToss
You. At this time, let Z be the impedance of a person and electrode A be
Let the flowing current be i1And the current flowing through the electrode B is iTwoPlace
In this case, the following equation is established. [0042]   e = ri1+ R1i1+ (I1+ ITwo) Z (Equation 1) [0043]   e = riTwo+ RTwoiTwo+ (I1+ ITwo) Z (Equation 2) From the above equations 1 and 2, the following equations 3 and
And Equation 4 are obtained. [0045]   i1(R + R1) = ITwo(R + RTwo(Equation 3) [0046]   iTwo= I1(R + R1) / (R + RTwo(Equation 4) By substituting equation (4) into equation (1), the following equation (5) is obtained.
Can be [0048]   e = ri1+ R1i1+ (I1+ I1(R + R1) / (R + RTwo)) Z   = I1(R (Z + r) + R1RTwo+ 2Zr + rTwo) / (R + RTwo) (Equation 5) From the above equation (5), the following equation (6) is obtained. [0050]   i1= E (r + RTwo) / (R (Z + r) + R1RTwo+ 2Zr + rTwo(Equation 6) Similarly, equation 7 is obtained. [0052]   iTwo= E (r + R1) / (R (Z + r) + R1RTwo+ 2Zr + rTwo(Equation 7) Where R1, RTwoUse the overall resistance R
Equation (8) is obtained. [0054]   R1/ R = (2r / R + 1) iTwo/ (I1+ ITwo) -R / R (Equation 8) Since r and R are known, they flow through electrode A.
Current i1And the current i flowing through the electrode BTwoIs determined by measurement
From Equation 8, R1/ R can be determined. In addition,
R1/ R is the impedance Z including a human contacted with a finger
Does not depend on Therefore, if the impedance Z is zero,
As long as it is not infinite, Equation 8 holds,
Can be ignored. In the touch sensor 10 of the present embodiment, the first
The above principle is applied to the transparent conductive film 2 and the second transparent conductive film 4
Is done. The first transparent conductive film 2 by the switching circuit
When a voltage is selectively applied, the first transparent conductive film 2
Is the measured value of the current flowing through the pair of Y-coordinate detecting conductive parts 5?
From the position of the Y coordinate (R1/ R) is detected. Also,
The second transparent conductive film 4 is selectively charged by the etching circuit.
When pressure is applied, a pair of X seats of the second transparent conductive film 4
From the measured value of the current flowing through the mark detecting conductive portion 6, the X coordinate
Position (R1/ R) is detected. As a result, contact poi
The coordinates (X, Y coordinates) of the event are determined. As described above, the touch of the present embodiment is described.
The sensor 10 has two transparent conductive films 2 and 4, and the Y seat
The mark detecting conductive part 5 and the X coordinate detecting conductive part 6 are separate
It is provided on a transparent conductive film. Therefore, the transparent conductive film
This transparent conductive film has only one Y-axis and X-axis.
In which a conductive part for detecting the position in the direction is provided.
Compared with the conventional touch sensor, the pattern of the conductive part for coordinate detection
Can be simplified. This allows transparent conduction
The area where the coordinate detection conductive part is formed on the
As we can cut, we can detect contact point
The area of the operation surface can be enlarged. Further, the first transparent circuit is provided by the switching circuit.
The electrical conduction between the conductive film 2 and the second transparent conductive film 4 is alternately turned off.
The position of the Y coordinate and the position of the X coordinate are independent
Detected. Therefore, the position of one coordinate is detected.
Is not affected by the position detection of the other coordinate
Thus, the position coordinates can be detected with high accuracy. In the touch sensor 10, the first transparent conductive film 2
And the second transparent conductive film 4 has a uniform low resistance in the plane.
It is preferably formed from a material such as
It is formed from a tin oxide (ITO). Also invited
The electric conductor layer 3 is made of, for example, polyethylene
It is formed from phthalate (PET). With PET
Since it has the same refractive index as ITO, the first transparent conductive
At the interface between the film 2 and the dielectric layer 3 or at the second transparent conductive film 4
No reflection occurs at the interface with the dielectric layer 3 and the touch sensor 1
0 can be suppressed from decreasing. Ma
In addition, since the dielectric layer 3 has the above thickness, the first
The insulation between the transparent conductive film 2 and the second transparent conductive film 4 is ensured.
Can be made. The material of the dielectric layer 3 is PET.
In addition, glass with a refractive index similar to PET,
May be used. The thickness of the dielectric layer 3 is used.
Is appropriately determined depending on the material used. As described with reference to FIG.
In a resistive touch sensor, two transparent conductive films 12 are used.
It is necessary to provide the air layer 13 between
From the difference in reflectance between the air layers 12 and 14 and the air layer 13, the transmittance is
There is a problem of lowering. In contrast, the present embodiment
In the analog capacitance type touch sensor 10 of FIG.
The body layer 3 has the same refractive index as ITO such as PET
Material can be used.
Suppress the decrease in transmittance compared to the touch sensor of the
Can be. The above-mentioned transparent conductive films 2, 4 or dielectric layer
Material 3 is a normal analog resistive touch sensor
Common to the materials used for Also described with reference to FIG.
As described above, the coordinate detecting conductive portion 5 of the touch sensor 10,
Pattern 6 is a normal analog resistive touch panel.
This is the same as the pattern of the conductive part of the sensor. Therefore,
When manufacturing the touch sensor 10, the existing analog resistive film is used.
-Type touch sensor manufacturing equipment and materials can be used
Therefore, an increase in manufacturing cost can be suppressed. Next, referring to FIG.
An example of the configuration of the position detection circuit provided in the device 10 will be described.
You. The position detection circuit shown in FIG.
It is provided with a conversion detection circuit 61. Current change detection circuit 61
Are connected to the Y-coordinate detection conductive portion 5 of the first transparent conductive film 2 and the ground.
Current flowing between the second transparent conductive film 4 and the X
Measures the current flowing between the mark detection conductive part 6 and the ground
I do. By switching the switching circuit 69, the Y seat
Target detecting conductive part 5 and touch sensor AC drive oscillation circuit 65
Electrical contact with the X-coordinate detecting conductive portion 6
Electrical conduction with the AC sensor drive circuit 65
Can be switched. Therefore, the Y-coordinate detecting conductive portion 5 and
And a selected one of the X-coordinate detecting conductive parts 6,
The AC voltage is generated by the touch sensor AC drive oscillation circuit 65.
Applied. This allows each conductive part to be
The current flowing through 5, 6 has an AC component. The output of the current change detection circuit 61 is an analog
Amplification and band pass fill by signal processing circuit 62
We receive processing of taring. The analog signal processing circuit 62
The output is detected by the detection filtering circuit 63.
After that, it is further input to the noise elimination DC conversion circuit 64.
The noise elimination DC circuit 64 includes a detection filtering circuit 6.
3 is converted to DC, and compared to the current flowing through each conductive part 5, 6.
A signal with the example values is generated. The above signal is output from the noise canceling DC conversion circuit 64.
The analog multiplexer 66 receives the above signal,
After switching, the outputs from the conductive units 5 and 6 are A / D
Transmitted to converter 67. The A / D converter 67 is a digital
The converted signal (data) is sent to the processing device 68.
The processing device 68 is, for example, a display device described later with reference to FIG.
Equipped inside display devices with various elements and various computers
And execute data processing. In the embodiment described above, the first transparent
The conductive film 2 includes a Y-coordinate detection conductive portion 5 including a pair of conductive portions.
The second transparent conductive film 4 includes a pair of conductive portions.
It had an outgoing conductive part 6. However, the transparent conductive of the present invention
The configuration of the conductive parts 5 and 6 provided on the films 2 and 4 is not limited to this.
Not done. For example, as shown in FIG.
The electric part 5 includes three or more conductive parts 5 separated in the Y direction.1
~ 5NMay be provided. Similarly for X coordinate detection
The conductive portion 6 includes three or more conductive portions 6 separated in the X direction.
1~ 6NMay be provided. In this case, the pattern of the conductive portions 5 and 6 is as shown in FIG.
Although it is more complicated than the pattern shown in
More accurately detect the position of the contact point
Can be. As described above, when the number of conductive portions is increased,
In this case, the conductive part placed in the display area is formed from a transparent material.
Preferably. The touch sensor 10 of this embodiment described above is
In terms of type, it is used by being arranged on a display element. FIG.
FIG. 2 is a schematic diagram of a display device 30 having a touch sensor 10.
The display device 30 includes a touch sensor on the display surface of the display element 20.
10 are arranged and configured. The display elements 20 are arranged in a matrix.
Matrix substrate 2 having a plurality of pixel electrodes
2 and the transparent substrate facing the active matrix substrate 22.
Bright counter substrate 24 and display provided between these substrates
And a medium layer 26. The display element 20 is, for example, a liquid crystal display.
It can be a device or an organic EL device. The display element 20 is liquid
In the case of a crystal display element, the display medium layer 26 is a liquid crystal layer.
In the case of an organic EL element, the display medium layer 26
An organic EL layer. In the display device 30, the touch sensor 10
Of the second transparent conductive film 4 of the display device 20
May also be used. Thereby, the transparent counter substrate 2
4 does not need to be provided, so that a decrease in transmittance is suppressed.
Can be [0071] According to the present invention, a complicated conductive pattern is provided.
Position detection easily and with high accuracy without forming
Analog capacitive touch sensor and
And a display device using the touch sensor.
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing a structure of a touch sensor according to one embodiment of the present invention. FIG. 2 is a plan view schematically showing a first transparent conductive film and a second transparent conductive film of FIG. 1; FIG. 3 is a schematic diagram for explaining a basic principle of a position detection method using a capacitance coupling method employed in the present invention. FIG. 4 is a block diagram of a position detection circuit employed in the touch sensor according to the embodiment. FIG. 5 is a plan view showing a modified example of a transparent conductive film. FIG. 6 is a schematic diagram of a display device having the touch sensor according to the embodiment. FIG. 7 is a perspective view schematically showing a general analog resistive film type touch sensor. FIG. 8 is a plan view schematically showing a transparent resistive film of a conventional analog capacitive touch sensor. DESCRIPTION OF SYMBOLS 1 Glass 2 First transparent conductive film 3 Dielectric layer 4 Second transparent conductive film 5 Conductor for Y coordinate detection 6 Conductor for X coordinate detection 10 Touch sensor 11 PET film 12 Transparent resistance film 13 Air layer Reference Signs List 14 transparent resistance film 15 glass film 16 conductive part 17 conductive part 18 transparent resistance film 19 conductive segment pattern 20 display element 22 active matrix substrate 24 transparent counter substrate 26 display medium layer 30 display device 61 current change detection circuit 62 analog signal processing Circuit 63 Detection and filtering circuit 64 Noise elimination DC circuit 65 Touch sensor AC drive oscillation circuit 66 Analog multiplexer 67 A / D converter 68 Processing device 69 Switching circuit

Claims (1)

1. A touch sensor for detecting an external input point in an operation surface extending in an X direction and a Y direction by a capacitive coupling method, wherein the touch sensor is arranged in parallel with the operation surface. A first transparent conductive film electrically connected to a Y-coordinate detection conductive portion for detecting the Y-direction coordinate of the input point; and a first transparent conductive film arranged to face the first transparent conductive film. And
A second transparent conductive film electrically connected to a Y-coordinate detection conductive portion for detecting the coordinates of the input point in the Y direction; and between the first transparent conductive film and the second transparent conductive film. A touch sensor, comprising: a provided dielectric layer; and a switching circuit that applies a voltage to one selected from the first transparent conductive film and the second transparent conductive film. 2. The touch sensor according to claim 1, wherein the switching circuit alternately switches electrical conduction of the first transparent conductive film and electrical conduction of the second transparent conductive film. 3. The Y-direction coordinate of the input point is obtained from the magnitude of a current flowing between the input point and the Y-th coordinate detecting conductive part, wherein the input point and the X-coordinate detecting conductive part are obtained. 3. The touch sensor according to claim 1, further comprising a detection circuit that obtains a coordinate of the input point in the X direction from a magnitude of a current flowing between the input point and the input point. 4. The Y-coordinate detecting conductive part is provided on the first transparent conductive film and has at least two conductive parts separated in the Y-direction. The touch sensor according to any one of claims 1 to 3, wherein the touch sensor includes at least two conductive portions provided on the second transparent conductive film and separated in the X direction. 5. The touch sensor according to claim 1, wherein the dielectric layer is formed of polyethylene terephthalate. 6. The touch sensor according to claim 1, wherein the dielectric layer is formed of glass. 7. A glass is provided on a main surface of the first transparent conductive film or the second transparent conductive film opposite to the dielectric layer side, and the input point is provided through the glass. 7. The touch sensor according to any one of items 1 to 6. 8. A display device with a touch sensor, comprising: the touch sensor according to claim 1; and a display element provided with the touch sensor on a display surface.
JP2001371246A 2001-12-05 2001-12-05 Touch sensor and display device with touch sensor Pending JP2003173238A (en)

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JP2001371246A JP2003173238A (en) 2001-12-05 2001-12-05 Touch sensor and display device with touch sensor

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP2001371246A JP2003173238A (en) 2001-12-05 2001-12-05 Touch sensor and display device with touch sensor
EP10178969A EP2261777A1 (en) 2001-08-22 2002-07-18 Display device with a touch sensor for generating position data and method therefor
EP02747697A EP1422601A4 (en) 2001-08-22 2002-07-18 Touch sensor, display with touch sensor and method for generating position data
US10/487,338 US8031180B2 (en) 2001-08-22 2002-07-18 Touch sensor, display with touch sensor, and method for generating position data
CN 02812843 CN1275131C (en) 2001-08-22 2002-07-18 Touch Sensor, display with touch sensor, and method for generating position data
PCT/JP2002/007331 WO2003019346A1 (en) 2001-08-22 2002-07-18 Touch sensor, display with touch sensor, and method for generating position data
EP10178975A EP2267584A1 (en) 2001-08-22 2002-07-18 Touch sensor for generating position data and display having such a touch sensor
KR20047002095A KR100642183B1 (en) 2001-08-22 2002-07-18 Touch sensor, display with touch sensor, and method for generating position data
TW91116733A TWI225219B (en) 2001-08-22 2002-07-26 Touch sensor, display device having a touch sensor, and method for generating position data
US13/222,327 US8395595B2 (en) 2001-08-22 2011-08-31 Touch sensor, display device with touch sensor, and method of generating location data

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JP2003173238A true JP2003173238A (en) 2003-06-20

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