JP2014115739A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device including a capacitance coupling system touch panel for achieving the detection of a capacitance with high fidelity as an input device by using a conductive film containing metal nano-wire in which the fluctuation of conductive characteristics is suppressed.SOLUTION: The display device includes: a display circuit board 11 and a transparent substrate 15 disposed so as to face each other; and a display circuit layer 12 at the display circuit substrate 11 side. The display device includes a capacitance coupling system touch panel including a capacitance detection touch panel circuit layer 14 disposed on the transparent substrate 15 for detecting a position where a transparent electrode for detecting XY position coordinates is touched as an input device. In the capacitance coupling system touch panel, the transparent electrode is constituted of the conductive film of metal nano-wire contained in transparent resin, and the metal nano-wire is exposed from the surface layer of transparent resin, and the exposed metal nano-wire is connected to a connection electrode leading to lead-out wiring.

Description

  The present invention relates to a display device, and more particularly to a technique effective when applied to a display device including a capacitively coupled touch panel using a conductive film containing metal nanowires as a transparent electrode as an input device.

  For example, as an example of a display device, an active matrix display device using a thin film transistor has advantages such as thinness and light weight, and displays various electronic devices such as a television, a computer, a mobile phone, a small portable device, an in-vehicle device, and the like. Generally used as a device.

  Many of these display devices are liquid crystal display devices or organic electroluminescence display devices. The liquid crystal display device is a display device comprising a combination of a liquid crystal cell in which a liquid crystal is sandwiched between a pair of transparent substrates, an optically anisotropic film bonded to both outer sides of the liquid crystal cell, and a backlight serving as a display light source. . An organic electroluminescent display device is a display device that emits light by sandwiching an organic electroluminescent material between electrodes and changing the power applied to the electrodes to light emission.

  On the other hand, a touch panel is a device having a function of detecting a position by touching a screen corresponding to a display area of a display device with a finger or a pen and inputting position coordinates or the like to the display device by combining with the display device. is there. There are various types of touch panels in terms of their operating principles, but recently, capacitive touch panels are mainly used for small portable devices.

  In the capacitive coupling type touch panel, a patterned transparent electrode for detecting a touched position is formed on a touch panel screen on a touch panel substrate corresponding to a display area of the display device. Wiring for extracting a position detection signal from the transparent electrode is formed around the touch panel screen, and includes a wiring circuit for outputting the position detection signal to an external detection circuit.

  This capacitively coupled touch panel has the advantage of being able to detect the touched position at high speed, and based on the finger touch, it detects the change in the capacitance between the fingertip and the position detection electrode. To do. For example, when detecting the XY position, the XY position detection electrodes are insulated from each other.

  In such a touch panel, a metal oxide conductor such as indium tin oxide is typically used for the above-described transparent electrode in terms of conductivity and light transmittance. However, since the metal oxide film is usually formed in a vacuum using a sputtering method, there is a problem that requires a formation cost. In particular, indium tin oxide requires a high temperature condition near 200 ° C. to form a film excellent in conductivity and light transmittance, and the internal stress of the formed film is large. There is a problem.

  Instead of the metal oxide film having such a problem, a conductive film containing metal nanowires is known in recent years. In particular, it is known that metal nanowires are contained in a coating solution, and a transparent conductive film is formed on a substrate by coating and drying using an inkjet method, a dispensing method, or a screen printing method.

  For example, Patent Document 1 is known as an example of combining a capacitively coupled touch panel and a display device. Patent Document 1 describes an organic electroluminescence device with an input function in which a capacitively coupled touch panel is combined with an organic electroluminescence configuration.

JP 2008-216543 A

  By the way, as a result of the study of the present inventor regarding a technique in which a conventional capacitive coupling type touch panel including the above-mentioned Patent Document 1 and a display device are combined, the following has been clarified.

  For example, in a conductive film containing metal nanowires, the metal nanowires come into contact with each other to be electrically connected and conductive, thereby expressing conductive characteristics. At this time, when the metal nanowire is contained in the coating solution to form a coating film and heat-dried to form a transparent conductive film, the film is dried and contracted from the time of coating to the time of forming the dried film. . At this time, there is no individual difference because the shape and relative positional relationship of the metal nanowires are not the same for each formed film. For this reason, the relative positional relationship between the metal nanowires in the film varies, and the contact bonding state varies depending on the film. For this reason, it is considered that there is a problem that the conductive characteristics fluctuate every time the film is formed.

  Therefore, the present invention has been made in view of the above-described problems, and a typical object thereof is to use a conductive film containing metal nanowires with suppressed variation in conductive characteristics, and to provide a high-quality capacitance. An object of the present invention is to provide a display device including a capacitively coupled touch panel that realizes detection as an input device.

  The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

  In other words, a typical display device includes a display region that includes a first substrate and a second substrate that are opposed to each other and a pixel region of thin film transistor circuits that are arranged in a matrix on the first substrate side. The apparatus has the following characteristics. In the display device, the second substrate is a transparent substrate, a transparent electrode for detecting XY position coordinates is provided on the second substrate, and a position touched to the transparent electrode is detected by capacitive coupling. A capacitively coupled touch panel is provided as an input device.

  The touch panel includes a lead electrode for connecting to an external circuit of the touch panel, the transparent electrode being made of a conductive film of metal nanowires contained in a transparent resin, laminated on a part of the surface of the conductive film. The metal nanowire is exposed from the surface layer of the transparent resin, and the exposed metal nanowire and the extraction electrode are joined.

  In particular, as the display device, a liquid crystal display device including a backlight serving as a display light source with a liquid crystal layer sandwiched between the first substrate and the second substrate, or the thin film transistor circuit on the first substrate. An organic electroluminescence display device including a light emitting element in which an organic electroluminescence layer is formed between electrode layers connected to each other.

  Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.

  In other words, a typical effect is to realize a display device that has a capacitive touch panel that realizes high-quality capacitance detection as an input device, using a conductive film containing metal nanowires that suppresses fluctuations in conductive properties. can do.

It is a schematic sectional drawing for demonstrating an example of the display apparatus which is Embodiment 1 of this invention. It is a board | substrate top view for demonstrating an example of the capacitive coupling system touchscreen contained in the display apparatus which is Embodiment 1 of this invention. FIG. 2 is a cross-sectional view of the touch panel for explaining a connection portion between the transparent electrode and the lead-out wiring (section c cut in FIG. 2). 2 is a cross-sectional view of the touch panel (a-a ′ cut surface in FIG. 2) for explaining an intersection of transparent electrodes at XY position coordinates in FIG. 2. FIG. 2 is a cross-sectional view of the touch panel (b-b ′ cut surface in FIG. 2) for explaining an intersection of transparent electrodes at XY position coordinates in FIG. 2. It is process sectional drawing for demonstrating an example of the manufacturing method of the capacitive coupling system touchscreen shown in FIG. FIG. 7 is a process cross-sectional view for explaining an example of the manufacturing method of the capacitive coupling touch panel shown in FIG. 2 following FIG. 6. It is a schematic sectional drawing for demonstrating an example of the liquid crystal display device which is Embodiment 2 of this invention. It is a schematic sectional drawing for demonstrating an example of the organic electroluminescent display apparatus which is Embodiment 3 of this invention.

  In the following embodiments, when it is necessary for the sake of convenience, the description will be divided into a plurality of embodiments or sections. However, unless otherwise specified, they are not irrelevant and one is the other. There are some or all of the modifications, details, supplementary explanations, and the like. Further, in the following embodiments, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), especially when clearly indicated and when clearly limited to a specific number in principle, etc. Except, it is not limited to the specific number, and may be more or less than the specific number.

  Further, in the following embodiments, the constituent elements (including element steps and the like) are not necessarily indispensable unless otherwise specified and apparently essential in principle. Needless to say. Similarly, in the following embodiments, when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numerical values and ranges.

[Outline of Embodiment of the Present Invention]
The display device according to the embodiment of the present invention has the following characteristics (for example, the corresponding components, reference numerals, etc. are added in parentheses).

  The display device according to the present embodiment includes a first substrate (display circuit substrate 11) and a second substrate (transparent substrate 15) that are arranged to face each other, and a thin film transistor circuit that is arranged in a matrix on the first substrate side. A display device having a display area (display circuit layer 12) which is a pixel assembly of the above, and has the following characteristics. In the display device, the second substrate is a transparent substrate, a transparent electrode (transparent electrodes 142 and 143) for detecting XY position coordinates is provided on the second substrate, and a position touched with respect to the transparent electrode A capacitive coupling type touch panel (capacitance detection touch panel circuit layer 14) is detected as an input device.

  The touch panel is made of a conductive film of metal nanowires in which the transparent electrode is contained in a transparent resin, and is laminated on a partial surface of the conductive film, and is connected to an external circuit of the touch panel (drawer) A wiring 144 and a connection electrode 145), wherein the metal nanowire is exposed from the surface layer of the transparent resin, and the exposed metal nanowire and the extraction electrode are joined.

  In particular, as the display device, a liquid crystal display device including a backlight (backlight 26) serving as a display light source in which a liquid crystal layer (a sandwich liquid crystal layer 23) is sandwiched between the first substrate and the second substrate, or The organic electroluminescence display device includes a light emitting element in which an organic electroluminescence layer (organic electroluminescence light emitting circuit layer 36) is formed between electrode layers connected to the thin film transistor circuit on the first substrate.

  More preferably, the display device has the following characteristics. The metal nanowire has a cross-sectional diameter of 10 to 100 nm and a length of 1 to 100 μm. The metal nanowire is a silver nanowire. The touch panel has a structure in which the transparent resin of the conductive film is bonded to the surface of the transparent substrate, and the metal nanowire is contained in a thickness in the range of 10 to 200 nm of the surface layer of the conductive film. The transparent resin of the conductive film is made of a photosensitive resin insulator. The conductive film has a light transmittance of 80% or more in the visible light region.

  Further, in the display device of the present embodiment, the capacitive coupling touch panel provided as an input device has a feature manufactured by the following steps (for example, components corresponding to ()) , Symbols, drawings, etc.) That is, the photosensitive resin composition is transferred from a support film (support film 52) provided with a photosensitive resin composition film (photosensitive resin composition films 51 and 53) containing metal nanowires in a transparent resin. A step of attaching a product film to the transparent substrate (FIGS. 6- (2) and 6- (4)), exposing the photosensitive resin composition film to a desired shape through a light-shielding mask, and an alkaline developer The transparent electrode made of a conductive film containing metal nanowires in a transparent resin formed in a desired shape on the transparent substrate is formed by removing the unexposed portion in the exposure by development using A step (FIGS. 6- (3), 7- (5)), a layer on the surface of the conductive film, and bonding to the metal nanowire exposed from the surface layer of the transparent resin; Forming a lead electrode for connecting with an external circuit is realized from a (FIG. 7 (6)).

  The transparent resin described above is in the form of a film, and the metal nanowires are fixed in a solid material, and the relative positional relationship between the metal nanowires does not change even after the conductive film is formed by film transfer, exposure, or development. For this reason, the conductive characteristics designed in the initial stage of the film do not change even after the conductive film is formed. The capacitive coupling method that realizes high-quality electrostatic capacity detection by using this as a conductive film. A touch panel can be realized.

  The second substrate having the capacitive coupling touch panel and the first substrate having a display area which is a pixel assembly of thin film transistor circuits arranged in a matrix are opposed to each other. The provided display device is realized. For example, in the case of a liquid crystal display device, the first substrate and the second substrate are sealed with an adhesive sealing material at the outer periphery of the substrate, and a liquid crystal layer is sandwiched between the first substrate and the second substrate, A liquid crystal cell is realized, and a liquid crystal display device is provided with a backlight serving as a display light source. In addition, the organic electroluminescence display device is a self-luminous organic electroluminescence display device by forming an organic electroluminescence layer as a light emitting element between electrode layers on a thin film transistor circuit substrate which is a first substrate.

  Each embodiment based on the outline of the embodiment of the present invention described above will be described in detail below based on the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

[Embodiment 1]
The display device of this embodiment will be described with reference to FIGS.

<Display device>
The display device of this embodiment will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view for explaining an example of the display device.

  The display device of this embodiment is a display device including a capacitively coupled touch panel as an input device, and includes a display circuit board 11, a display circuit layer 12, a sandwiching layer 13, a capacitance detection touch panel circuit layer 14, and a transparent substrate. 15 or the like.

  The display device of this embodiment includes a display circuit layer 12 that is a pixel aggregate of thin film transistor circuits arranged in a matrix on a display circuit substrate 11. A transparent substrate 15 having a capacitance detection touch panel circuit layer 14 is provided on the opposing surface of the display circuit layer 12, and a sandwiching layer 13 is formed by the display circuit substrate 11 and the transparent substrate 15 facing each other.

  In this display device, light emitted from the display circuit layer 12 provided on the display circuit substrate 11 on the back side passes through the sandwiching layer 13, the capacitance detection touch panel circuit layer 14, and the transparent substrate 15 on the front side to become display light. A display device provided with a capacitively coupled touch panel can be realized.

<Capacitive coupling type touch panel>
With reference to FIG. 2, the capacitive coupling touch panel included in the display device shown in FIG. 1 will be described. FIG. 2 is a substrate plan view for explaining an example of the capacitive coupling touch panel. 2 is a portion of the transparent substrate 15 including the capacitance detection touch panel circuit layer 14 shown in FIG.

  The capacitive coupling touch panel of this embodiment includes a transparent substrate 15, a touch screen 141, a transparent electrode (X position coordinate) 142, a transparent electrode (Y position coordinate) 143, a lead wire 144, a connection electrode 145, and a connection terminal 146. Etc.

  In the capacitive coupling type touch panel of the present embodiment, there is a touch screen 141 for detecting a touch position coordinate on one side of the transparent substrate 15, and a change in the capacitance is detected in this region to obtain an X position coordinate. A transparent electrode 142 and a transparent electrode 143 having Y position coordinates are provided. In FIG. 2, for the sake of distinction and easy understanding, the transparent electrode 142 with the X position coordinate is illustrated with a horizontal line, and the transparent electrode 143 with the Y position coordinate is illustrated with a vertical line.

  Each of the transparent electrodes 142 and 143 having the X and Y position coordinates includes a lead wire 144 for connecting to a driver element circuit for controlling an electric signal as a touch panel, and the lead wire 144 and the transparent electrodes 142 and 143. A connection electrode 145 for connecting the two is disposed. Furthermore, a connection terminal 146 connected to the driver element circuit is disposed at the end of the lead-out wiring 144 opposite to the connection electrode 145.

  As the transparent substrate 15, a glass substrate such as alkali glass such as soda glass or borosilicate glass, non-alkali glass, or chemically strengthened glass is suitable. Further, polyester films such as polyethylene terephthalate having transparency and polyethylene naphthalate, polyimide films having high heat resistance and transparency are also known, and such resin-based substrates having transparency can also be used.

  The transparent electrodes 142 and 143 are made of a conductive film in which metal nanowires are contained in a transparent resin. The metal nanowire has a cross-sectional diameter of 10 to 100 nm and a length of 1 to 100 μm. The metal nanowire is exposed from the surface layer of the transparent resin, and the exposed metal nanowire and the connection electrode 145 connected to the lead-out wiring 144 are joined.

  As the metal nanowire, nanowires such as Au, Ag, Pt, Cu, Co, C, and Pd can be used. Among these, Ag nanowire is a suitable constituent material from the viewpoint of conductivity and light transmittance as a conductive film, and in this embodiment, an example using Ag nanowire will be described.

  The transparent electrodes 142 and 143 have a structure in which the transparent resin of the conductive film is bonded to the surface of the transparent substrate 15, and the metal nanowire is contained in a thickness in the range of 10 to 200 nm of the surface layer of the conductive film. Yes. The transparent resin of the conductive film is made of a photosensitive resin insulator, and the light transmittance of the conductive film is 80% or more in the visible light region.

  The lead wiring 144 is preferably a metal electrode formed by sputtering or vapor deposition. Specific examples include alloys such as Ag—Pd—Cu, Al—Cu, Ni—Cu, Al, Cu, and Ni, stacked electrodes, and single electrodes. It is also possible to form using an Ag conductive paste.

<Connection between transparent electrode and lead wire>
With reference to FIG. 3, the cross-sectional structure of the connection portion between the transparent electrode and the lead-out wiring in the capacitively coupled touch panel shown in FIG. 2 will be described. FIG. 3 is a cross-sectional view of the touch panel for explaining the connection portion between the transparent electrode and the lead-out wiring, and shows a section c cut in FIG. In FIG. 3, the connection portion between the transparent electrode 143 at the Y position coordinate and the lead wire 144 is shown, but the same applies to the connection portion between the transparent electrode 142 at the X position coordinate and the lead wire 144.

  The connection electrode 145 that connects the transparent electrode 143 and the lead-out wiring 144 is formed in a structure that is laminated at the end of the transparent electrode 143 when the lead-out wiring 144 is formed. Is not required.

  The transparent electrode 143 is made of a conductive film in which metal nanowires are contained in a transparent resin. The transparent resin layer 143a is laminated on the surface of the transparent substrate 15, and the metal nanowire-containing layer is laminated on the surface of the transparent resin layer 143a. 143b. The metal nanowire of the metal nanowire-containing layer 143b is exposed from the surface layer, and the exposed metal nanowire and the connection electrode 145 connected to the lead-out wiring 144 are joined. For example, in the metal nanowire-containing layer 143b, the end of the metal nanowire or the like protrudes from the surface, resulting in a partially exposed structure.

  With such a structure, the transparent electrode 143 at the Y position coordinate, the connection electrode 145, and the lead-out wiring 144 are electrically connected. Similarly, the transparent electrode 142 at the X position coordinate, the connection electrode 145, and the lead-out wiring 144 are electrically connected. As transparent electrodes, transparent electrodes 142 and 143 having X and Y position coordinates are provided.

<Intersection of transparent electrodes at XY position coordinates>
The cross-sectional structure of the intersection of the transparent electrodes at the XY position coordinates in the capacitive coupling type touch panel shown in FIG. 2 will be described with reference to FIGS. 4 and 5. 4 and 5 are cross-sectional views of the touch panel for explaining the intersections of the transparent electrodes at the XY position coordinates. FIG. 4 shows the aa ′ cut surface of FIG. 2, and FIG. The bb 'cut surface of this is shown.

  The transparent electrode 142 at the X position coordinate is made of a conductive film in which metal nanowires are contained in a transparent resin, and includes a transparent resin layer 142a made of an insulating resin and a metal nanowire-containing layer 142b laminated on the transparent resin layer 142a. Has been. Similarly, the transparent electrode 143 at the Y position coordinate is made of a conductive film in which metal nanowires are contained in a transparent resin, and includes a transparent resin layer 143a made of an insulating resin, and metal nanowires laminated on the transparent resin layer 143a. The layer 143b is configured.

  In the intersection of the transparent electrodes 142 and 143 at the XY position coordinates having such a configuration, the intersection of the transparent electrode 143 at the Y position coordinates with respect to the transparent electrode 142 at the X position coordinates is as shown in FIG. The transparent resin layer 143a made of an insulating resin forms an insulated cross structure. Further, as shown in FIG. 5, the intersection of the transparent electrode 142 at the X position coordinate and the transparent electrode 143 at the Y position coordinate has an intersecting structure insulated by a transparent resin layer 143a made of an insulating resin. Yes. As a result, the transparent electrode 142 at the X position coordinate and the transparent electrode 143 at the Y position coordinate are insulated from each other.

  In the transparent electrodes 142 and 143 of these XY position coordinates, as described above, among metal nanowires such as Au, Ag, Pt, Cu, Co, C, and Pd, the viewpoint of conductivity and light transmission as a conductive film. To Ag nanowires are most suitable.

  Further, in the transparent electrodes 142 and 143, the transparent resin layers 142a and 143a are bonded to the surface of the transparent substrate 15, and the metal nanowires are contained in a thickness of 10 to 200 nm of the surface layers of the metal nanowire-containing layers 142b and 143b. ing. The transparent resin of the conductive film is made of a photosensitive resin insulator, and the light transmittance of the conductive film is 80% or more in the visible light region.

<Method of manufacturing capacitively coupled touch panel>
A method for manufacturing the capacitively coupled touch panel shown in FIG. 2 will be described with reference to FIGS. 6 and 7 are process cross-sectional views for explaining an example of the manufacturing method of this capacitively coupled touch panel, and are cross-sectional views subsequent to FIG. 6 followed by FIG. 6 and 7, (1) to (3) are cross-sectional views of the cut surface similar to FIG. 4, (4) to (5) are cross-sectional views of the cut surface similar to FIG. 6) shows a cross-sectional view of the cut surface similar to FIG.

  The touch panel shown in FIG. 2 was produced under the following conditions.

  First, as shown to (1), the support body film 52 provided with the photosensitive resin composition film 51 in which the metal nanowire contained in transparent resin is prepared. This is a member having a film structure in which a photosensitive resin composition film 51 is laminated on a support film 52 for supporting the photosensitive resin composition film 51. In this photosensitive resin composition film 51, metal nanowires are fixed in a solid material made of a transparent resin. As a member having this film structure, a member having a structure in which a base film is laminated on the side opposite to the support film 52 of the photosensitive resin composition film 51 can also be used.

  Next, as shown in (2), the photosensitive resin composition film 51 is bonded to the transparent substrate 15 by film transfer from the support film 52 provided with the photosensitive resin composition film 51. By this film transfer, the transparent substrate 15 has a structure in which a portion of the photosensitive resin composition film 51 peeled from the support film 52 is bonded.

  Then, as shown in (3), the photosensitive resin composition film 51 is exposed to a desired shape through a light shielding mask, an unexposed portion in the exposure step is removed using an alkaline developer, and the transparent substrate 15 is removed. A transparent electrode 142 having an X position coordinate formed of a conductive film containing metal nanowires in a transparent resin formed in a desired shape is formed.

  Next, after the formation of the transparent electrode 142 serving as the X position coordinates, as shown in (4), the film transfer is again performed in the same manner as (2) above in order to form the transparent electrode 143 serving as the Y position coordinates. Then, the photosensitive resin composition film 53 is bonded to the transparent substrate 15.

  Then, as shown in (5), similarly to the above (3), it is exposed to a desired shape through a light shielding mask, an unexposed portion in the exposure process is removed using an alkaline developer, and the transparent substrate 15 is removed. A transparent electrode 143 having a Y position coordinate formed of a conductive film containing metal nanowires in a transparent resin formed in a desired shape is formed.

  Next, as shown in (6), on the surface of the transparent substrate 15, a lead wire 144 for connecting to an external circuit and a connection electrode 145 for connecting the lead wire 144 and the transparent electrode 143 (142) are formed. . Here, the lead-out wiring 144 and the connection electrode 145 are formed at the same time by using a screen printing method using a conductive paste material containing flake-shaped Ag.

  By using the photosensitive resin composition films 51 and 53 in which the metal nanowires are fixed in a solid material made of a transparent resin by the steps (1) to (6) described above, the relative positional relationship between the metal nanowires is film transfer. Since the conductive film is not changed after the conductive film is formed by exposure or development, a capacitively coupled touch panel having transparent electrodes 142 and 143 having high-quality XY position coordinates can be manufactured.

  In this way, it is possible to obtain a capacitive coupling type touch panel that realizes high-quality electrostatic capacitance detection, whereby a display device using a transparent substrate having a capacitive coupling type touch panel as a counter substrate is provided. Can be realized.

<Effects of the present embodiment>
According to the display device of the present embodiment described above, the pixel assembly of the thin film transistor circuit having the display circuit substrate 11 and the transparent substrate 15 which are opposed to each other and arranged in a matrix on the display circuit substrate 11 side. In a display device having a certain display circuit layer 12, transparent electrodes 142 and 143 for detecting XY position coordinates are provided on a transparent substrate 15, and the positions touched with respect to these transparent electrodes 142 and 143 are capacitively coupled. According to the configuration including the capacitive coupling touch panel including the capacitive detection touch panel circuit layer 14 detected by the above as an input device, the following effects can be obtained.

  (1) In the capacitively coupled touch panel, the transparent electrodes 142 and 143 are made of a metal nanowire conductive film contained in a transparent resin, and are connected to the lead-out wiring 144 laminated on a part of the surface of the conductive film. 145, the metal nanowire is exposed from the surface layer of the transparent resin, and the exposed metal nanowire and the connection electrode 145 connected to the lead-out wiring 144 are joined to each other, so that the fluctuation of the conductive property is suppressed. A display device including a capacitive touch panel that realizes high-quality capacitance detection as an input device can be realized by using a conductive film that contains.

  That is, the member for forming the transparent electrodes 142 and 143 is a film made of the photosensitive resin composition film 51, the metal nanowires are fixed in a solid material, and the relative positional relationship between the metal nanowires is film transfer. There is no change even after the conductive film is formed by exposure or development. For this reason, the conductive characteristics designed in the initial stage of the film do not change even after the conductive film is formed. Therefore, by using this as the conductive film, the electrostatic property that realizes detection by high-quality capacitive coupling is realized. A display device including a capacitively coupled touch panel as an input device can be realized.

  (2) In the above (1), the conductive films of the transparent electrodes 142 and 143 can be optimized from the viewpoints of conductivity and light transmittance, particularly under the following conditions. (2-1) The metal nanowires of the metal nanowire-containing layers 142b and 143b have a cross-sectional diameter in the range of 10 to 100 nm and a length in the range of 1 to 100 μm. (2-2) The metal nanowires of the metal nanowire-containing layers 142b and 143b are silver nanowires. (2-3) The conductive films of the transparent electrodes 142 and 143 bonded to the surface of the transparent substrate 15 are metal nanowires containing metal nanowires in a thickness in the range of 10 to 200 nm of the surface layer of the conductive film. It has inclusion layers 142b and 143b. (2-4) The transparent resin in the transparent resin layers 142a and 143a of the conductive film of the transparent electrodes 142 and 143 and the metal nanowire-containing layers 142b and 143b are made of a photosensitive resin insulator. (2-5) The transparent resin in the transparent resin layers 142a and 143a of the conductive film of the transparent electrodes 142 and 143 and the metal nanowire-containing layers 142b and 143b has a light transmittance of 80% or more in the visible light region. The above conditions (2-1) and (2-2) are suitable from the viewpoint of conductivity, and the above conditions (2-3), (2-4) and (2-5) are suitable from the viewpoint of light transmission. ing.

[Embodiment 2]
The display device of this embodiment will be described with reference to FIG. This embodiment is an example applied to a liquid crystal display device.

  The liquid crystal display device of this embodiment will be described with reference to FIG. FIG. 8 is a schematic cross-sectional view for explaining an example of the liquid crystal display device.

  The liquid crystal display device of the present embodiment is a display device that includes a capacitively coupled touch panel as an input device, and includes a display circuit transparent substrate 21, a display circuit layer 22, a sandwiched liquid crystal layer 23, and a capacitance detection touch panel circuit layer 24. , Transparent substrate 25, backlight 26, polarizing plate 27, polarizing plate 28, substrate peripheral liquid crystal sealing material 29, and the like.

  The liquid crystal display device of the present embodiment includes a backlight 26 serving as a display light source, a polarizing plate 27 that polarizes light from the backlight 26 for light transmission and blocking by the liquid crystal, and a display that transmits the polarized light. A display circuit layer 22 which is a pixel aggregate of thin film transistor circuits arranged in a matrix on a circuit transparent substrate 21 is provided. On the opposite surface of the display circuit layer 22, there is a transparent substrate 25 having a capacitance detection touch panel circuit layer 24, and a polarizing plate 28 that is paired with a polarizing plate 27. The sandwiched liquid crystal layer 23 is sandwiched between the substrates by a substrate peripheral liquid crystal sealing material 29 that joins the display substrate transparent substrate 21 and the transparent substrate 25 facing each other around the substrate. The sandwiched liquid crystal layer 23 allows the light from the backlight 26 to pass through the opposing polarizing plate 28 to become display light, thereby realizing a liquid crystal display device including a capacitively coupled touch panel.

  According to the liquid crystal display device of the present embodiment described above, in the configuration in which the sandwiched liquid crystal layer 23 is sandwiched between the display circuit transparent substrate 21 and the transparent substrate 25 and the backlight 26 serving as a display light source is provided, the capacitance By providing the coupling method touch panel as an input device, the same effect as in the first embodiment can be obtained.

[Embodiment 3]
The display device of this embodiment will be described with reference to FIG. This embodiment is an example applied to an organic electroluminescence display device.

  The organic electroluminescence display device of this embodiment will be described with reference to FIG. FIG. 9 is a schematic cross-sectional view for explaining an example of the organic electroluminescence display device.

  The organic electroluminescence display device according to the present embodiment is a display device including a capacitively coupled touch panel as an input device, and includes a display circuit board 31, a display circuit layer 32, a sandwiched transparent adhesive layer 33, and a capacitance detection touch panel circuit. The layer 34, the transparent substrate 35, the organic electroluminescence light emitting circuit layer 36, and the like.

  The organic electroluminescence display device of the present embodiment includes a display circuit layer 32 which is a pixel assembly of thin film transistor circuits arranged in a matrix on a display circuit substrate 31, and an organic layer between electrode layers connected to the thin film transistor circuit is provided on the display circuit layer 32. An ultra-thin film of electroluminescent material is formed, and an organic electroluminescent light emitting circuit layer 36 is provided that emits light from the organic electroluminescent material by applying current to the electrodes. On the opposite surface of the organic electroluminescence light emitting circuit layer 36, there is a transparent substrate 35 including a capacitance detection touch panel circuit layer 34. The display circuit substrate 31 and the transparent substrate 35 facing each other are bonded by a transparent sandwich transparent adhesive layer 33 for light transmission. Light emitted from the organic electroluminescence light emitting circuit layer 36 passes through the sandwich transparent adhesive layer 33, the capacitance detection touch panel circuit layer 34, and the transparent substrate 35 to become display light, and the organic electroluminescence having the capacitive coupling type touch panel A display device can be realized.

  According to the organic electroluminescence display device of the present embodiment described above, in the configuration provided with the light emitting element in which the organic electroluminescence light emitting circuit layer 36 is formed between the electrode layers connected to the thin film transistor circuit on the display circuit substrate 31, By providing a capacitively coupled touch panel as an input device, the same effect as in the first embodiment can be obtained.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. . Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 11 ... Display circuit board 12 ... Display circuit layer 13 ... Holding layer 14 ... Capacitance detection touch panel circuit layer 141 ... Touch screen 142 ... Transparent electrode (X position coordinate)
142a ... Transparent resin layer 142b ... Metal nanowire-containing layer 143 ... Transparent electrode (Y position coordinate)
143a ... Transparent resin layer 143b ... Metal nanowire-containing layer 144 ... Lead-out wiring 145 ... Connection electrode 146 ... Connection terminal 15 ... Transparent substrate 21 ... Display circuit transparent substrate 22 ... Display Circuit layer 23 ... sandwiched liquid crystal layer 24 ... capacitance detection touch panel circuit layer 25 ... transparent substrate 26 ... backlight 27 ... polarizing plate 28 ... polarizing plate 29 ... peripheral of substrate Liquid crystal sealing material 31 ... display circuit board 32 ... display circuit layer 33 ... sandwich transparent adhesive layer 34 ... capacitance detection touch panel circuit layer 35 ... transparent substrate 36 ... organic electroluminescence light emission Circuit layer 51 ... photosensitive resin composition film 52 ... support film 53 ... photosensitive resin composition film

Claims (8)

A display device having a display region that is a pixel assembly of thin film transistor circuits that are arranged in a matrix on the first substrate side, the display device having a first substrate and a second substrate that are opposed to each other.
The second substrate comprises a transparent substrate;
A transparent electrode for detecting XY position coordinates is provided on the second substrate, and a capacitive coupling type touch panel for detecting a position touched to the transparent electrode by capacitive coupling is provided as an input device.
The touch panel
The transparent electrode consists of a conductive film of metal nanowires contained in a transparent resin,
A lead electrode for connecting to an external circuit of the touch panel, laminated on a part of the surface of the conductive film,
The display device, wherein the metal nanowire is exposed from a surface layer of the transparent resin, and the exposed metal nanowire and the extraction electrode are joined. The display device according to claim 1,
The display device is a liquid crystal display device including a backlight serving as a display light source, with a liquid crystal layer sandwiched between the first substrate and the second substrate. The display device according to claim 1,
The display device is an organic electroluminescence display device including a light emitting element in which an organic electroluminescence layer is formed between electrode layers connected to the thin film transistor circuit on the first substrate. The display device according to claim 1,
The metal nanowire has a cross-sectional diameter of 10 to 100 nm and a length of 1 to 100 μm. The display device according to claim 1,
The display device, wherein the metal nanowire is a silver nanowire. The display device according to claim 1,
The touch panel has a structure in which the transparent resin of the conductive film is bonded to the surface of the transparent substrate, and the metal nanowire is contained in a thickness in the range of 10 to 200 nm of the surface layer of the conductive film. A display device. The display device according to claim 1,
The display device, wherein the transparent resin of the conductive film is made of a photosensitive resin insulator. The display device according to claim 1,
The display device, wherein the conductive film has a light transmittance of 80% or more in a visible light region.

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