JP2013168033A - Touch panel and position detection method - Google Patents

Abstract

Provided is a low-cost and thin touch panel that can detect a position simply by touching and does not matter what material is in contact with the touch panel.
A first conductive film having a plurality of separation regions formed in a strip shape long in one direction, and a plurality of separation regions formed in a strip shape long in the other direction substantially orthogonal to the one direction. An isolation region in the first conductive film is arranged in the other direction, and the isolation region in the second conductive film is arranged in the one direction. The first conductive film and the second conductive film are used to detect a coordinate position by capacitive coupling, and the first conductive film and the second conductive film are detected. In either one of the conductive films, a potential gradient is generated in a predetermined direction, and on the other side, the contact is made by detecting the potential at the position where the first conductive film and the second conductive film are in contact with each other. Must detect the position of the coordinate position To solve the above problems by providing a touch panel, wherein.
[Selection] Figure 1

Description

  The present invention relates to a touch panel and a position detection method.

  A touch panel is an input device that allows direct input to the display, and is often used by installing it on the front of the display. It can be directly input based on information visually captured by the display. Are used in various applications.

  As such a touch panel, a resistance film type and a capacitance type are widely known. The resistive film type touch panel is installed so that each transparent conductive film is opposed to each other in the upper electrode substrate and the lower electrode substrate on which the transparent conductive film is formed, and each of the upper electrode substrates is applied with a force. The transparent conductive films are in contact with each other, and the position where the force is applied can be detected.

  Resistive touch panels can be broadly classified into four-wire, five-wire, and diode. In the 4-wire system, an X-axis electrode is provided on one of the upper electrode substrate and the lower electrode substrate, and a Y-axis electrode is provided on the other (for example, Patent Document 1). In the 5-wire system, both the X-axis electrode and the Y-axis electrode are provided on the lower electrode substrate, and the upper electrode substrate functions as a probe for detecting a voltage (for example, Patent Documents). 2). The diode type has a structure in which a diode is provided on the lower electrode substrate, and is provided with two electrodes for applying a voltage and four electrodes for monitoring a potential. In addition to the electrodes provided on the upper electrode substrate that functions as a probe for detecting the presence of seven electrodes, it is also called a seven-wire type (for example, Patent Document 3).

  In the capacitive method, position detection is performed by detecting a current flowing through a transparent electrode or the like of the touch panel when a finger or the like approaches the touch panel.

  Further, since the capacitive touch panel and the resistive touch panel have different characteristics, a touch panel having a structure in which a resistive touch panel and a capacitive touch panel are stacked is disclosed. (For example, Patent Documents 4 and 5).

JP 2004-272722 A JP 2008-293129 A JP 2005-196280 A Utility Model Registration No. 3132106 Utility Model Registration No. 3139196 JP 2009-116849 A

  By the way, since the capacitive touch panel is a detection method based on capacitive coupling, it has a feature that the position can be detected by simply touching without touching, but the position is not detected by contact with an insulator. It cannot be detected. In addition, the resistance film type touch panel has a feature that the material of the touch panel does not matter, but the position detection includes a transparent conductive film as an upper resistance film and a transparent conductive film as a lower resistance film. Since it is performed by touching, it is necessary to press the touch panel with a predetermined force.

  On the other hand, what is described in Patent Documents 4 and 5 has a structure in which a capacitive touch panel and a resistive film type touch panel are stacked, and the capacitive touch panel and the resistive film system. The touch panel has good features.

  However, since the touch panel having such a structure has two types of touch panels laminated thereon, it has a problem that the thickness is increased and a problem that the cost is increased.

  The present invention has been made in view of the above, and has a characteristic of a capacitive touch panel and a good characteristic of a resistive touch panel, that is, a position can be detected and touched only by touching. The object is to provide a thin touch panel at a low cost regardless of the material of the object. It is another object of the present invention to provide a position detection method for such a touch panel.

  The present invention provides a first conductive film having a plurality of separation regions formed in a strip shape long in one direction, and a plurality of separation regions formed in a strip shape long in the other direction substantially orthogonal to the one direction. An isolation region in the first conductive film is arranged in the other direction, and the isolation region in the second conductive film is arranged in the one direction. The first conductive film and the second conductive film are used to detect a coordinate position by capacitive coupling, and the first conductive film and the second conductive film are detected. In either one of the conductive films, a potential gradient is generated in a predetermined direction, and on the other side, the contact is made by detecting the potential at the position where the first conductive film and the second conductive film are in contact with each other. To detect the position of the coordinate position. And butterflies.

  The present invention also provides a first conductive film having a plurality of separation regions that are long and elongated in one direction, and a separation region that is long and elongated in the other direction substantially orthogonal to the one direction. A plurality of second conductive films, wherein the isolation regions in the first conductive film are arranged in the other direction, and the isolation regions in the second conductive film are in the one direction In the method for detecting the position of the touch panel arranged in the position, the step of detecting the position of the coordinate position by capacitive coupling using the first conductive film and the second conductive film, and the first conductive film One of the second conductive film and the second conductive film generates a potential gradient in a predetermined direction, and the other detects the potential at the position where the first conductive film and the second conductive film are in contact with each other. By using the resistive film method, Characterized in that it and a step of performing detection.

  According to the present invention, it is possible to detect a position simply by touching, and to provide a thin touch panel at a low cost regardless of the material of the touched object. A detection method can be provided.

Explanatory drawing of the touch panel in 1st Embodiment Structural diagram of the touch panel in the first embodiment Explanatory drawing (1) of the drive method of the touchscreen in 1st Embodiment Explanatory drawing (2) of the drive method of the touch panel in 1st Embodiment Explanatory drawing of the touch panel in 2nd Embodiment Structural diagram of the touch panel in the second embodiment Structural diagram of the touch panel in the third embodiment Explanatory drawing of the other touch panel in 3rd Embodiment (1) Explanatory drawing of the other touch panel in 3rd Embodiment (2) Structural diagram of touch panel in fourth embodiment Structural diagram of touch panel in fifth embodiment

  The form for implementing this invention is demonstrated below. In addition, about the same member etc., the same code | symbol is attached | subjected and description is abbreviate | omitted.

[First Embodiment]
The touch panel in the first embodiment will be described. As shown in FIGS. 1 and 2, the touch panel in the present embodiment includes a first transparent conductive film 10 and a second transparent conductive film 20. In the present embodiment, position detection at a contact point (contact position) can be performed by a capacitance method using the first transparent conductive film 10 and the second transparent conductive film 20, and a resistance film method. Thus, position detection at the contact point (contact position) can be performed. In the present embodiment, it is assumed that the first conductive film is the first transparent conductive film 10 and the second conductive film is the second transparent conductive film 20.

  The first transparent conductive film 10 is formed on one surface of the first transparent substrate 11, and has a plurality of strip-shaped separation regions 10a and 10b that are formed long in the X-axis direction. The separation regions 10a and 10b are alternately arranged in the Y-axis direction, and electrodes 12a and 12b are connected to both ends of each separation region 10a and 10b, that is, both ends in the X-axis direction. In addition, although the code | symbol is abbreviate | omitted in drawing, the electrodes 12a and 12b are formed in all the isolation | separation area | regions 10a and 10b.

  The second transparent conductive film 20 is formed on one surface of the second transparent substrate 21, and has a plurality of strip-shaped separation regions 20a and 20b formed long in the Y-axis direction. The separation regions 20a and 20b are alternately arranged in the X-axis direction, and electrodes 22a and 22b are connected to both ends of each separation region 20a and 20b, that is, both ends in the Y-axis direction. In the drawing, the reference numerals are omitted, but the electrodes 22a and 22b are formed in all the separation regions 20a and 20b.

  The first transparent conductive film 10 and the second transparent conductive film 20 are metal oxides such as ITO (indium-tin oxide) and AZO (Al-doped zinc oxide), and are made of a transparent material having conductivity. Is formed. In addition, as long as the 1st transparent conductive film 10 and the 2nd transparent conductive film 20 are transparent materials which have electroconductivity, you may form with materials other than a metal oxide. That is, any material that has conductivity and can transmit light may be used. Specifically, it is formed of a material called an alternative material such as ITO, such as a conductive polymer, metal nanowire, or carbon nanotube. Also good.

  The first transparent substrate 11 is a transparent resin material such as PET (Polyethylene terephthalate), and is formed of a material that is easily bent. The second transparent substrate 21 is made of a transparent inorganic material such as glass or a transparent resin material such as plastic.

  In the touch panel in the present embodiment, the first transparent substrate 11 and the second transparent substrate 21 have one surface of the first transparent substrate 11 and one surface of the second transparent substrate 21 opposed to each other. In this state, they are joined by an adhesive member 42 such as a frame-like double-sided tape. Thereby, a space 43 is formed by the first transparent substrate 11 and the second transparent substrate 21, and the first transparent conductive film 10 and the second transparent conductive film 20 are opposed to each other through the space 43. Be placed.

(Driving method)
Next, a method for driving the touch panel in this embodiment will be described. The touch panel in the present embodiment is one in which position detection by the capacitance method and position detection by the resistance film method are time-divisionally performed alternately. That is, when the position detection by the capacitance method is performed, the position detection by the resistance film method is not performed, and when the position detection by the resistance film method is performed, the position detection by the capacitance method is not performed.

  Based on FIG. 3, a case where position detection by a capacitive method is performed on the touch panel in the present embodiment will be described. In the position detection by the electrostatic capacity method, the position detection at the contact point is performed using the first transparent conductive film 10 and the second transparent conductive film 20. By the way, in the position detection by the electrostatic capacity method, it is preferable that the separation regions in the first transparent conductive film 10 and the second transparent conductive film 20 are formed apart from each other. In the present embodiment, the first transparent conductive film 10 and the second transparent conductive film 20 are used not only in the electrostatic capacity method but also in the resistance film method. Therefore, the separation regions 10a and 10b are formed in the first transparent conductive film 10, and the separation regions 20a and 20b are formed in the second transparent conductive film 20, but the position detection in the capacitive method is performed. In some cases, only the separation region 10a of the separation regions 10a and 10b is used, and only the separation region 20a of the separation regions 20a and 20b is used. That is, in the touch panel according to the present embodiment, when position detection is performed by the capacitive method, the separation region 10a is driven through the electrode 12a, but the separation region 10b is driven through the electrode 12b. Further, without being grounded, it is in an open state, that is, a floating state. Similarly, the isolation region 20a is driven through the electrode 22b, but the isolation region 20b is not driven through the electrode 22b, and is not grounded. It has become.

  As described above, in the touch panel according to the present embodiment, when position detection is performed by the capacitive method, the separation region 10a in the first transparent conductive film 10 and the separation region 20a in the second transparent conductive film 20 are separated. Used.

  Next, based on FIG. 4, the case where position detection by the resistive film method is performed on the touch panel in the present embodiment will be described. In position detection by the resistance film method, position detection is performed using the first transparent conductive film 10 and the second transparent conductive film 20. Specifically, position detection is performed by the same method as the 4-wire type in the resistive film type. By the way, in the position detection by the resistance film method, it is preferable and possible that the separation regions formed in the first transparent conductive film 10 and the second transparent conductive film 20 are narrowly formed. For example, it is preferable that the surface is formed on one surface without being divided into each separation region. However, since the 1st transparent conductive film 10 and the 2nd transparent conductive film 20 are used also in an electrostatic capacitance system, it is necessary to isolate | separate into each isolation | separation area | region. For this reason, as described above, the distance between the separation regions 10a and 10b and the distance between the separation regions 20a and 20b are formed to be as narrow as possible.

  In the touch panel in the present embodiment, when position detection is performed by the resistive film method, a potential gradient is generated in the first transparent conductive film 10 by applying a predetermined voltage to the electrodes 12a and 12b, and the second By detecting the potential at the position in contact with the first transparent conductive film 10 by the transparent conductive film 20, the coordinates of the contact point in the X direction are detected. Moreover, a potential gradient is generated in the second transparent conductive film 20 by applying a predetermined voltage to the electrodes 22a and 22b, and the first transparent conductive film 10 is in contact with the second transparent conductive film. By detecting the potential, the coordinates of the contact point in the Y direction are detected. Thereby, the position of the contact point can be detected by the resistive film method.

  As described above, in the touch panel according to the present embodiment, when position detection is performed by the resistive film method, the separation regions 10a and 10b in the first transparent conductive film 10 and the separation regions 20a and 20b in the second transparent conductive film 20 are detected. 20b is used.

[Second Embodiment]
Next, a second embodiment will be described. This embodiment is a touch panel having a structure in which a transparent conductive film for preventing noise from a display device such as a liquid crystal display device is formed, and will be described with reference to FIGS. The touch panel in the present embodiment is installed on a display device 60 such as a liquid crystal display device, and includes a first transparent conductive film 10, a second transparent conductive film 20, and a third transparent conductive film 50. have. The third transparent conductive film 50 is formed on the side facing the display device 60, for example, the other surface of the second transparent substrate 21 in the touch panel in the present embodiment, and the third transparent conductive film 50. Is connected to the ground potential (GND) via an electrode 51 provided around the. Thereby, the noise generated in the display device 60 can be blocked by the third transparent conductive film 50, and the occurrence of a malfunction or the like when the position of the contact position is detected on the touch panel can be prevented. Note that the third transparent conductive film 50 is formed of the same material as the first transparent conductive film 10 and the like. Such a third transparent conductive film 50 in the present embodiment is a third conductive film.

[Third Embodiment]
Next, a third embodiment will be described. In the present embodiment, a decorative film serving as a decorative portion is formed on the touch panel. Specifically, as shown in FIG. 7, a decorative film 70 serving as a decorative portion formed of a black insulator material is formed on the edge of one surface of the first transparent substrate 11, and The first transparent conductive film 10 is formed thereon. Thus, the appearance quality in a touch panel can be improved by forming the decoration film 70 in the edge part of a touch panel, and giving a decoration. The decorative film 70 can be formed on one surface of the first transparent substrate 11 by a printing method such as screen printing or by sticking a film that becomes the decorative film 70. The first transparent conductive film 10 can be formed by pasting a transparent conductive film on the one on which the decorative film 70 is formed, or by a film forming method such as sputtering.

  In addition, as shown in FIG. 8, the touch panel in the present embodiment has a conductive property serving as a decoration portion on the first transparent conductive film 10 formed on one surface of the first transparent substrate 11. The decorative film 71 may be formed. In this case, the decorative film 71 is formed of a black conductive material, and is formed by a printing method such as screen printing using a black conductive paste, for example. In addition, it is necessary to isolate | separate each area | region in the 1st transparent conductive film 10 electrically. For this reason, as shown in FIG.8 (b), between each isolation | separation area | region 10a and isolation | separation area | region 10b of the 1st transparent conductive film 10, the decoration film 71 currently formed with the black electroconductive material Is partially removed, and a black insulator region 72 is formed of a black insulating material in the region where the decorative film 71 is removed. Examples of the material for forming the black conductive paste include materials containing silver carbon or the like. Moreover, as a black insulating material, the thing containing the pigment which consists of a black oxide which has insulation, a black resin material, etc. are mentioned. 8A is a cross-sectional view of the touch panel, and FIG. 8B is a plan view of the first transparent substrate 10 as viewed from one side.

  In addition, as shown in FIG. 9, the touch panel in the present embodiment has an insulating property that serves as a decoration portion on the first transparent conductive film 10 formed on one surface of the first transparent substrate 11. The decorative film 73 may be formed. In this case, the decorative film 73 can be formed by a printing method such as screen printing using a black insulating paste. Examples of the material for forming the black insulating paste include those containing a pigment made of black oxide having insulating properties and black resin materials. In addition, a transparent conductive film 74 is formed in order to connect the respective isolation regions 10a and 10b in the first transparent conductive film 10 and the electrodes 12a and 12b corresponding to the respective isolation regions 10a and 10b. As a result, the isolation regions 10 a and 10 b in the first transparent conductive film 10 and the electrodes 12 a and 12 b corresponding to the isolation regions 10 a and 10 b can be electrically connected by the transparent conductive film 74. The transparent conductive film 74 can be formed by a printing method such as screen printing using a transparent conductive pace formed of a transparent conductive material having conductivity. Examples of the material for forming the transparent conductive paste include those containing fine particles of a transparent conductive material such as ITO. 9A is a cross-sectional view of the touch panel, and FIG. 9B is a plan view of the first transparent substrate 10 as viewed from one surface.

[Fourth Embodiment]
Next, a fourth embodiment will be described. This embodiment is a touch panel having a structure in which an antireflection film is formed in order to prevent reflection on a substrate, a transparent conductive film, or the like. By forming the antireflection film, reflection on the touch panel can be reduced, and each separation region in the first transparent conductive film 10 or the second transparent conductive film 20 can be made inconspicuous.

  For example, in the touch panel in the present embodiment shown in FIG. 10, an antireflection film 81 is formed on the other surface of the first transparent substrate 11, and on one surface of the first transparent substrate 11. An antireflection film 82 is formed. An antireflection film 83 is formed on the other surface of the second transparent substrate 21, and an antireflection film 84 is formed on one surface of the second transparent substrate 21. Note that the touch panel in the present embodiment may be formed with a part of the antireflection films 81 to 84 or may be formed with all of them. In FIG. 10, the antireflection film 82 is formed between the first transparent substrate 11 and the first transparent conductive film 10, and the antireflection film 83 is formed between the second transparent substrate 21 and the first transparent substrate 21. 2 is formed between the two transparent conductive films 20. However, the antireflection film 82 may be formed on the surface of the first transparent conductive film 10, and the antireflection film 83 is formed on the surface of the second transparent conductive film 20. It may be. Such antireflection films 81 to 84 may be formed by a dielectric multilayer film in which dielectrics having different refractive indexes are alternately laminated by a film forming method such as vacuum deposition or sputtering, such as an AR film. It may be formed by attaching an antireflection film. Thereby, reflection in a touch panel can be reduced.

[Fifth Embodiment]
Next, a fifth embodiment will be described. This embodiment is a touch panel having a structure in which a polarizing plate is provided in order to prevent reflection on the touch panel. The touch panel in the present embodiment is used when a liquid crystal display device is used as the display device 60, and specifically, on the other surface of the first transparent substrate 11, as shown in FIG. The polarizing plate 90 is provided. The touch panel having the structure shown in FIG. 11 is installed on the display screen of the display device 60, and is installed so that the display device 60 is located on the other surface side of the second transparent substrate 21. The polarizing plate 90 is attached to the other surface of the first transparent substrate 11 with an adhesive layer 44. The polarizing plate 90 is installed after the position of the polarizing plate used in the display device 60 is adjusted with the polarization direction. Thereby, reflection in a touch panel can be reduced.

  The touch panel in the present embodiment is used when the display device 60 is a liquid crystal display device, and uses the polarizing plate 90. Therefore, the first transparent substrate 11 and the second transparent substrate 21 are: It is preferably made of an optically isotropic material that does not have birefringence or the like. Specifically, the first transparent substrate 11 and the second transparent substrate 21 are formed of an optically isotropic resin material such as polycarbonate or an optically isotropic inorganic material such as glass. It is preferable.

  As mentioned above, although the form which concerns on implementation of this invention was demonstrated, the said content does not limit the content of invention.

DESCRIPTION OF SYMBOLS 10 1st transparent conductive film 10a Isolated area | region 11 1st transparent substrate 12 Electrode 20 2nd transparent conductive film 20a Isolated area 20b Isolated area 21 2nd transparent substrate 22a Electrode 22b Electrode 41 Adhesive layer 42 Adhesive member 43 Space 50 Third transparent conductive film 51 Electrode 60 Display device 70 Decorative film 71 Decorative film 72 Black insulator region 73 Decorative film 74 Transparent conductive film 81, 82, 83, 84 Antireflection film 90 Polarized light Board

Claims (10)

A first conductive film having a plurality of separation regions formed in a strip shape long in one direction;
A second conductive film having a plurality of separation regions formed in a long strip shape in the other direction substantially orthogonal to the one direction;
Have
The isolation regions in the first conductive film are arranged in the other direction, and the isolation regions in the second conductive film are arranged in the one direction,
The position detection of the coordinate position by capacitive coupling is performed by the first conductive film and the second conductive film,
A position where a potential gradient is generated in a predetermined direction in one of the first conductive film and the second conductive film, and the first conductive film and the second conductive film are in contact with each other on the other side. A touch panel for detecting the position of the touched coordinate position by detecting the potential of the touch panel. The first conductive film is formed on one surface of the first transparent substrate;
The second conductive film is formed on one surface of the second transparent substrate,
2. The touch panel according to claim 1, wherein one surface of the first transparent substrate and one surface of the second substrate are arranged to face each other. The touch panel is installed such that the side on which the second transparent substrate is formed is a side facing the display device,
The touch panel according to claim 2, wherein a third conductive film is formed on the other surface of the second transparent substrate.   The decoration part is formed in the circumference | surroundings of the one surface side of the said 1st transparent substrate by the black insulating material or the black electroconductive material, The any one of Claim 1 to 3 characterized by the above-mentioned. Touch panel as described in 1.   An antireflection film is formed on one or both surfaces of one or more of the first conductive film, the second conductive film, the first transparent substrate, and the second transparent substrate. The touch panel according to claim 1, wherein the touch panel is provided. The touch panel is installed such that the side on which the second transparent substrate is formed is a side facing the display device,
The touch panel according to claim 1, wherein a polarizing plate is provided on the other surface side of the first transparent substrate. A first conductive film having a plurality of separation regions formed in a strip shape long in one direction, and a second conductive film having a plurality of separation regions formed in a strip shape long in the other direction substantially orthogonal to the one direction. A touch panel in which the isolation regions in the first conductive film are arranged in the other direction, and the isolation regions in the second conductive film are arranged in the one direction In the position detection method of
Using the first conductive film and the second conductive film to detect a coordinate position by capacitive coupling;
A position where a potential gradient is generated in a predetermined direction in one of the first conductive film and the second conductive film, and the first conductive film and the second conductive film are in contact with each other on the other side. Detecting the position of the coordinate position by the resistive film method by detecting the potential of
A method for detecting a position of a touch panel, comprising:   The step of detecting the position of the coordinate position by the capacitive coupling and the step of detecting the position of the coordinate position by the resistive film method are alternately performed. Touch panel position detection method. When detecting the position of the coordinate position by the capacitive coupling, a part of the separation region in the first conductive film is used,
The position detection of the touch panel according to claim 7 or 8, wherein when the position detection of the coordinate position by the resistance film method is performed, all of the separation regions in the first conductive film are used. Method. When performing the position detection of the coordinate position by the capacitive coupling, a part of the separation region in the second conductive film is used,
10. The touch panel according to claim 7, wherein when the position detection of the coordinate position by the resistance film method is performed, all of the isolation regions in the second conductive film are used. Position detection method.

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