JP2015132918A - Capacitance type touch panel sensor substrate and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitance type touch panel sensor substrate having high reliability and designing property, and a display device including the touch panel sensor substrate.SOLUTION: A capacitance type touch panel sensor substrate 10 includes layers of a film substrate 6 where a metal wiring pattern is formed, and a glass substrate 1 where a display region 3 and a frame part 2 covering a periphery of the display region is formed. On the film substrate 6, detection sensors 7, 8 in an X-axial direction and a Y-axial direction, respectively, are formed, in which the Y-axis sensor 8 is discontinuous near an intersection with the X-axis sensor 7; and lead-out wires 9 connected to the X-axis sensor 7 and the Y-axis sensor 8 are formed at positions facing the frame part 2. On the display region 3, a jumper part 4 composed of a transparent conductive layer is formed at a position facing the position where the Y-axis sensor 8 is discontinuous near the intersection; and a transparent insulating layer 5 is formed above the jumper part, in a range not forming a short circuit between the X-axis sensor 7 and the jumper part. The frame part 2 has concealing property and is formed to cover the lead-out wires 9.

Description

  The present invention relates to a capacitive touch panel sensor substrate used for a liquid crystal display and a display device including the same.

  2. Description of the Related Art In recent years, touch panels have been adopted for operation units of electronic devices having various image display functions such as mobile phones, personal digital assistants, and car navigation systems. The touch panel is configured by attaching a position input device capable of detecting a contact position of a finger or the like on a display screen such as a liquid crystal panel.

  The touch panel methods are roughly classified into a resistive film method, a capacitance method, an optical method, an ultrasonic method, and the like. In particular, the electrostatic capacity method is rapidly spreading because it includes a plurality of electrodes arranged in the X-axis direction and the Y-axis direction and is capable of multi-touch.

  Moreover, as a touchscreen sensor board | substrate, it divides roughly into a film type and a glass type, and is employ | adopted according to each use. For example, the film type has the advantage that it is light and difficult to break compared to the glass type. On the other hand, there is a problem that it is difficult to form a high-definition wiring pattern, the frame portion covering the wiring is enlarged, and the display area is narrowed. There is also a problem that the appearance is poor due to the difference in smoothness of the surface.

  Because of these problems, recently, many glass types have been adopted in smartphones and tablet computers (see Patent Document 1).

  A glass-type touch panel sensor substrate is generally a metal wiring on a glass substrate, two layers of transparent electrodes (ITO: Indium Tin Oxide) for the X-axis direction and the Y-axis direction, and an interlayer between the two transparent electrodes. It consists of an insulating layer and a protective layer on the surface. However, since a plurality of layers as described above are formed on one surface of the glass substrate by using a printing method or a photolithographic method, the glass substrate is formed by the pattern formed in the previous step in each pattern forming step. The surface has a complex concavo-convex shape, and it is difficult to accurately and efficiently form a further pattern thereon.

JP 2009-69321 A

  An object of the present invention is to provide a capacitive touch panel sensor substrate having high reliability and designability, and a display device including the same.

As means for solving the above-mentioned problems, the invention according to claim 1 is a glass substrate on which a film base material on which a metal wiring pattern is formed and a display area and a frame portion covering the outer periphery of the display area are formed. And a capacitive touch panel sensor substrate,
The film base is formed with an X-axis direction detection sensor and a Y-axis direction detection sensor at a position facing the display area, and the Y-axis direction detection sensor intersects with the X-axis direction detection sensor. A lead-out wiring that is discontinuous in the vicinity and is connected to the X and Y axis direction detection sensors is formed at a position facing the frame portion,
On the other hand, a jumper portion made of a transparent conductive layer is formed in the display area of the glass substrate so as to face a discontinuous position of the sensor for detecting the Y-axis direction in the vicinity of the intersection, and further, the X layer A transparent insulating layer is formed in the range where the axial detection sensor does not short-circuit with the jumper part,
In addition, the capacitive touch panel sensor substrate is characterized in that the frame portion has a concealing property and is formed so as to cover the lead-out wiring.

  The invention according to claim 2 is the capacitive touch panel sensor substrate according to claim 1, wherein the film base and the glass substrate are laminated via a transparent adhesive. is there.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the film substrate is made of a laminate of a metal foil and a plastic film, and the metal wiring is formed by a photoetching method. It is an electrostatic capacitance type touch panel sensor substrate of description.

  According to a fourth aspect of the present invention, the line width of the lead-out wiring is at least twice as large as the line widths of the X-axis direction detection sensor and the Y-axis direction detection sensor. 4. The capacitive touch panel sensor substrate according to any one of 3 above.

  The invention according to claim 5 is the capacitive touch panel sensor substrate according to any one of claims 1 to 4, wherein the transparent conductive layer is made of a metal oxide.

  The invention described in claim 6 is the capacitive touch panel sensor substrate according to any one of claims 1 to 5, wherein a picture is formed on the frame portion.

  A seventh aspect of the invention is a display device including the capacitive touch panel sensor substrate according to any of the first to sixth aspects.

  According to claim 1 of the present invention, the process is performed by laminating a film base material on which a metal wiring pattern is formed and a glass substrate on which a frame portion that covers the outer periphery of the separately produced display region is formed. It becomes simple and can produce a capacitive touch panel sensor substrate of excellent quality with high productivity.

  In particular, when the frame portion is formed on a glass substrate as in the prior art, and then an X-axis and Y-axis direction detection sensor and a lead wire are formed, the lead wire formed on the frame portion has a display area and a frame. Due to the difference in level with the part, there is a problem that it is difficult to form the wiring, and in some cases, disconnection occurs. However, according to the present invention, since the metal wiring such as the lead-out wiring is separately formed on the flat film base material having the metal layer, disconnection due to the step can be prevented.

  Further, since a jumper portion is formed in the display area of the glass substrate so as to oppose the discontinuous position of the Y-axis direction detection sensor in the vicinity of the crossing point, And the Y-axis direction detection sensor can be accurately conducted. Furthermore, a short circuit between the X-axis direction detection sensor and the jumper portion can be prevented by the transparent insulating layer formed on the jumper portion.

  In addition, since the lead-out wiring formed on the film base is entirely covered with the facing frame portion, it is possible to provide a touch panel sensor substrate with excellent design without being visually observed by the user. it can.

  According to claim 2, the film base material and the glass substrate are laminated via the transparent adhesive, and the alignment between the two can be easily and accurately performed. Further, since it is a transparent adhesive, the transparency of the display area is not impaired.

  According to claim 3, by using a film substrate made of a laminate of a metal foil and a plastic film, the metal wiring can be formed by a photoetching method, and the line width and shape are accurate. Can be well formed.

  According to a fourth aspect of the present invention, the line width of the lead-out wiring is more than twice as large as the line widths of the X-axis direction detection sensor and the Y-axis direction detection sensor, so that the connection with the control circuit is ensured. As a result, it is possible to prevent a decrease in response speed and to obtain high reliability.

  Moreover, according to the fifth aspect, high transparency and conductivity can be obtained by using a metal oxide as the transparent conductive layer forming the jumper portion.

  According to the sixth aspect, by forming a picture on the frame portion, it is possible to convey a message to the user and to improve the design.

  As described above, according to the present invention, it is possible to provide a capacitive touch panel sensor substrate having high reliability and design and a display device including the same.

FIG. 3 is a schematic plan view of a touch panel sensor substrate according to the present invention. The plane schematic diagram of the jumper part of Fig.1 (a). The plane schematic diagram of the crossing point vicinity of the sensor for a X-axis direction of FIG.1 (c) and a Y-axis direction.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic plan view showing an embodiment of a capacitive touch panel sensor substrate (hereinafter referred to as a touch panel sensor substrate) according to the present invention.

  FIG.1 (c) is the touch-panel sensor board | substrate 10 which concerns on this invention, and laminates | stacks the glass substrate 1 shown to Fig.1 (a), and the film base material 6 shown in FIG.1 (b) through an adhesive agent. It is characterized by becoming.

  Specifically, as shown in FIG. 1A, a display region 3 including a jumper portion 4 made of a transparent conductive layer and an insulating layer 5 formed thereon is provided on the glass substrate 1, and the display region. The frame part 2 which covers the outer periphery of 3 is formed. In addition, about the jumper part 4 and the transparent insulating layer 5 formed on it, the enlarged view was shown in FIG.2 (b) as one Embodiment.

  Further, as shown in FIG. 1B, on the film base 6, an X-axis direction detection sensor 7 and a Y-axis direction detection sensor 8 are disposed at positions facing the display area 3 of the glass substrate 1. In addition, lead-out wirings 9 are formed as metal wirings at positions covered by the frame portion. More specifically, the X-axis direction detection sensor 7 is formed as a continuous wiring, but the Y-axis direction detection sensor 8 is discontinuous near the intersection with the X-axis direction detection sensor 7. Is formed.

The discontinuous Y-axis direction detection sensor formed on the glass substrate 1 by laminating the glass substrate 1 and the film base 6 on which the respective patterns are formed as described above so that the patterns face each other. 7 can be conducted by the jumper portion 4 made of a transparent conductive layer. On the other hand, a transparent insulating layer 5 is formed on the upper part of the jumper portion 4, and a short circuit with the X-axis direction detection sensor 7 can be prevented. FIG. 3 (b) shows an enlarged view thereof.

  Thereby, the X-axis direction detection sensor 7 and the Y-axis direction detection sensor 8 are covered in the entire display area 3, and an excellent function as a touch panel sensor can be obtained.

  In addition, the lead-out wiring 9 for connecting the X-axis direction detection sensor 7 and the Y-axis direction detection sensor 8 to the control circuit is covered with the frame portion 2 having excellent concealment property, and is thus hidden from the operation side. be able to. In addition, since a picture can be formed in the said frame part 2, a message can also be conveyed to a user.

As the glass substrate 1 used in the present invention, generally, a glass substrate produced by a method such as a float method, a slit down draw method, a fusion down draw method, or a redraw method can be used. A glass substrate containing an alkali metal oxide capable of ion exchange treatment is preferable. For example, a known glass substrate such as aluminosilicate glass containing at least one alkali metal oxide selected from SiO ₂ , Al ₂ O ₃ , Li ₂ O, and Na ₂ O, or soda lime glass is used. be able to.

  The jumper portion 4 according to the present invention is made of a transparent conductive layer that is connected to the Y-axis direction detection sensor. The transparent conductive layer is preferably a metal oxide, and these are formed into a thin film on the glass substrate 1 by vapor deposition or sputtering, and then the jumper portion 4 is formed by photolithography. As the metal oxide, for example, indium tin oxide (ITO), tin oxide, indium oxide, zinc oxide, or the like can be used. Of these, ITO is preferable. Further, the surface resistance value of the jumper portion is preferably 100 to 1500 Ω / □. If the surface resistance value exceeds 1500 Ω / □, the detection accuracy as a sensor deteriorates.

  The shape of the jumper part 4 is not particularly limited, but is preferably rectangular. As for the size, the film thickness is preferably 25 to 140 nm and the short side width is preferably 100 to 200 μm. Further, the length of the long side only needs to be longer than the width of the X-axis direction detection sensor, and may be appropriately determined depending on the distance between the X-axis direction detection sensors. Within this range, continuity with the Y-axis direction detection sensor made of metal wiring is satisfied, and excellent detection accuracy can be obtained.

  The transparent insulating layer 5 according to the present invention is formed on the jumper portion 4 to reliably insulate the jumper portion 4 electrically connected to the Y-axis direction detection sensor 8 and the X-axis direction detection sensor 7. Is formed. Therefore, as shown in FIG. 3B, the size needs to be wider than the line width of the X-axis direction detecting sensor 7 and wider than the short side of the jumper portion 4, and if this is satisfied, The shape is not limited.

The transparent insulating layer 5 can be formed using an inorganic film such as SiO ₂ or SiN _x or an organic material such as a transparent resin. However, since the inorganic film is formed by CVD, sputtering, or the like, an organic material system is preferable because there is a problem that the manufacturing cost is increased, such as an increase in energy consumption and the number of processes.

  As the organic material system, an ultraviolet curable resin composition containing a polymerizable group-containing oligomer, monomer, photopolymerization initiator, additive and the like can be used. The composition can be cured by forming a pattern on the jumper 4 by a screen printing method or the like and then irradiating it with ultraviolet rays, thereby obtaining high productivity.

  The frame portion 2 according to the present invention is formed so as to cover the outer periphery of the display region 3. The frame portion 2 needs to be formed of a concealing material in order to conceal the metal wiring formed outside the display region 3. For example, it can be formed by blending a resin with black or other colored pigment alone, or by mixing a colored pigment to adjust a colored pigment composition. Further, it can be formed as a single layer or a multilayer.

  As the method for forming the frame portion 2, either a method of directly printing a pattern or a method of indirectly transferring a pattern previously formed on another base material can be used. The direct printing method is desirable, and the screen printing method is more desirable. Moreover, although the film thickness of the said frame part 2 is based also on the kind and solid content ratio of the color pigment in the color pigment composition to be used, 20-50 micrometers is preferable.

  In addition, a picture for transmitting a message to the user can be formed on the frame portion 2. In this case, for example, a method in which the picture is first formed on a glass substrate and the frame portion 2 is formed thereon is preferable.

  The film substrate according to the present invention is preferably a laminate of a plastic film and a metal excellent in transparency, mechanical strength, weather resistance, heat resistance and the like. By using such a laminate, the X-axis direction detection sensor 7, the Y-axis direction detection sensor 8, and the lead-out wiring 9 can be easily formed with high accuracy by the photolithography method.

  The laminate of the plastic film and the metal may be formed by laminating the plastic film and the metal foil via an adhesive, or by depositing metal on the plastic film. The former is desirable considering the width and thickness.

  In the laminate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate, polypropylene, or the like can be used as a plastic film, and copper, aluminum, or the like can be used as a metal foil. Among these, a laminate of a PET film and a copper foil is desirable because of its good workability and cost.

  The line width of the X-axis direction detection sensor 7 and the Y-axis direction detection sensor 8 is preferably 1 to 5 μm. When the line width is less than 1 μm, the formation of the line width by the photolithography method is not stable, and there is a possibility of disconnection. On the other hand, if it exceeds 5 μm, the sensor density is lowered and the sensitivity is lowered, or the wiring is clearly confirmed by visual observation and the quality as a display body is lowered.

  The thickness of the X-axis direction detection sensor 7 and the Y-axis direction detection sensor 8 is preferably 2 to 30 μm. If the thickness is less than 2 μm, defects due to voids and foreign matter are liable to occur and the quality is deteriorated. When the thickness exceeds 30 μm, a decrease in productivity and a high cost become problems.

  The line width of the lead-out wiring 9 is for connecting the X-axis direction detection sensor 7 and the Y-axis direction detection sensor 8 and the control circuit, and the X-axis direction detection sensor 7 and the Y-axis direction detection It is preferable that the sensor 8 is twice as thick as the sensor 8. If the line width is less than twice, the response speed of the control circuit may be reduced.

  The adhesive used for laminating the film substrate on which the metal wiring pattern described above is formed and the glass substrate on which the display area and the frame portion covering the outer periphery of the display area are formed has excellent transparency. It is not limited as long as it has durability and has strong adhesive force to resin, glass, and metal. For example, urethane adhesives, polyester adhesives, acrylic adhesives, and the like can be given.

  By providing the capacitive touch panel sensor substrate formed as described above, it is possible to provide a display device excellent in appearance shape and reliability.

  The present invention can be used for both small and large display devices as a capacitive touch panel sensor substrate for a liquid crystal display.

DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Frame part 3 Display area 4 Jumper part 5 Transparent insulating layer 6 Film base material 7 X-axis direction detection sensor 8 Y-axis direction detection sensor 9 Lead-out wiring 10 Touch panel sensor substrate

Claims (7)

A capacitive touch panel sensor substrate formed by laminating a film substrate on which a metal wiring pattern is formed and a glass substrate on which a display area and a frame portion covering the outer periphery of the display area are formed,
The film base is formed with an X-axis direction detection sensor and a Y-axis direction detection sensor at a position facing the display area, and the Y-axis direction detection sensor intersects with the X-axis direction detection sensor. A lead-out wiring that is discontinuous in the vicinity and is connected to the X and Y axis direction detection sensors is formed at a position facing the frame portion,
On the other hand, a jumper portion made of a transparent conductive layer is formed in the display area of the glass substrate so as to face a discontinuous position of the sensor for detecting the Y-axis direction in the vicinity of the intersection, and further, the X layer A transparent insulating layer is formed in the range where the axial detection sensor does not short-circuit with the jumper part,
The capacitive touch panel sensor substrate is characterized in that the frame portion has a concealing property and is formed so as to cover the lead-out wiring.   The capacitive touch panel sensor substrate according to claim 1, wherein the film base material and the glass substrate are laminated via a transparent adhesive.   The capacitive touch panel sensor substrate according to claim 1 or 2, wherein the film base is made of a laminate of a metal foil and a plastic film, and the metal wiring is formed by a photoetching method.   The capacitance type according to any one of claims 1 to 3, wherein a line width of the lead-out wiring is twice or more thicker than a line width of the X-axis direction detection sensor and the Y-axis direction detection sensor. Touch panel sensor substrate.   The capacitive touch panel sensor substrate according to claim 1, wherein the transparent conductive layer is made of a metal oxide.   The capacitive touch panel sensor substrate according to claim 1, wherein a picture is formed on the frame portion.   A display device comprising the capacitive touch panel sensor substrate according to claim 1.