JP2014013266A - Display device, and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device in which generation of bubbles in adhesive material caused by a light shielding layer of a cover substrate is suppressed to suppress deterioration of a polarizer.SOLUTION: A display device includes: a display panel 35a having a polarizer 36 attached on at least one surface thereof; a touch panel 20a stuck on the polarizer 36 side of the display panel 35a; and a cover substrate 41 which is stuck on the touch panel 20a via an ultraviolet ray curable adhesive material 45, and in which a frame-shaped light shielding layer 42 is provided in a peripheral end part on the adhesive material 45 side. The touch panel 20a includes: a transparent substrate 11b, provided on the adhesive material 45 side, for absorbing an ultraviolet ray; and a touch panel layer 16a provided on the polarizer 36 side with respect to the transparent substrate 11b.

Description

  The present invention relates to a display device and a manufacturing method thereof, and more particularly to a display device having a touch panel and a manufacturing method thereof.

  A display device including a touch panel is configured to be operable by touching an icon or the like displayed on a display screen via the touch panel, for example. And the display apparatus provided with the touch panel is mounted in the mobile phone in recent years, and attracts attention as a multifunctional smart phone. Here, in mobile electronic devices such as smartphones and tablet terminals, for example, a projection-type capacitive touch panel is pasted on the surface of a display panel such as a liquid crystal display panel, and the surface of the touch panel is made of glass. A structure in which a cover substrate such as a substrate is attached has become the mainstream.

  For example, in Patent Document 1, a touch panel is attached to an upper polarizing plate bonded to the surface of a color filter substrate constituting a liquid crystal display panel via an acrylic adhesive, and the acrylic adhesive is applied to the surface of the touch panel. A liquid crystal display device is disclosed in which a front window (corresponding to the above-described cover substrate) is pasted through the panel.

  Patent Document 2 discloses a double-sided pressure-sensitive adhesive sheet excellent in reworkability used when a touch panel is bonded and fixed to the display surface of a display device.

JP 2010-61026 A JP 2003-342542 A

  By the way, in the mobile electronic device having the above-described configuration, since the surface of the cover substrate is exposed to the outside, a configuration in which a frame-shaped light shielding layer is disposed on the peripheral end portion of the back surface of the cover substrate is mainly used. Here, the thickness of the light shielding layer is, for example, about 10 μm to 20 μm even when a black resin material having a high light shielding effect is used. In some cases, bubbles may remain along the surface step of the cover substrate formed due to the thickness of the cover substrate. In order to prevent the bubbles from remaining, the thickness of the adhesive material needs to be 10 times or more of the surface level difference, that is, about 100 μm to 200 μm or more. Resulting in. Therefore, a general adhesive material has low followability with respect to a level difference, and therefore, by using an ultraviolet curable adhesive material that has low viscoelasticity and is given adhesiveness by irradiation with ultraviolet rays, the cover substrate and the touch panel It has been proposed to reduce the thickness of the adhesive material disposed between the two. However, in the case of using an ultraviolet curable adhesive material, the polarizing plate disposed between the touch panel and the display panel previously attached to the touch panel via another adhesive material is also irradiated with ultraviolet light. There is a problem that the plate deteriorates.

  The present invention has been made in view of the above points, and the object of the present invention is to suppress the generation of bubbles in the adhesive material due to the light shielding layer of the cover substrate and to suppress the deterioration of the polarizing plate. is there.

  In order to achieve the above object, according to the present invention, an ultraviolet curable adhesive material is disposed between a touch panel and a cover substrate so that the transparent substrate of the touch panel absorbs ultraviolet rays.

  Specifically, a display device according to the present invention includes a display panel having a polarizing plate attached to at least one surface, a touch panel attached to the polarizing plate side of the display panel, and an ultraviolet curable type touch panel. A cover substrate attached via an adhesive material and provided with a frame-shaped light shielding layer at the peripheral edge of the adhesive material side, and the touch panel is transparent to absorb ultraviolet rays provided on the adhesive material side A substrate and a touch panel layer provided on the polarizing plate side of the transparent substrate are provided.

  According to the above configuration, the transparent substrate of the touch panel and the cover substrate on which the frame-shaped light shielding layer is provided at the peripheral end are attached via the ultraviolet curable adhesive material. Even if the surface step due to the above is formed, the generation of bubbles in the adhesive material is suppressed by the UV curable adhesive material having generally low viscoelasticity expanding following the surface step. And, in order to give adhesiveness to the UV curable adhesive material, when irradiating the adhesive material with UV light, even if the display panel is pasted together with the polarizing plate on the touch panel layer side of the touch panel, Since the transparent substrate of the touch panel absorbs ultraviolet rays, the ultraviolet rays hardly reach the polarizing plate attached to at least one surface of the display panel, and the deterioration of the polarizing plate is suppressed. Therefore, the bubble generation in the adhesive material due to the light shielding layer of the cover substrate is suppressed, and the deterioration of the polarizing plate is suppressed.

  The transparent substrate may absorb light having a wavelength of 365 nm or less.

  According to said structure, since a transparent substrate absorbs light with a wavelength of 365 nm or less, most of the ultraviolet rays irradiated in order to provide adhesiveness to an ultraviolet curable adhesive material are absorbed by the transparent substrate of a touch panel. .

  The transparent substrate may be a polyimide substrate.

  According to said structure, since a transparent substrate is a resin-made polyimide board | substrate, a touch panel is reduced in weight.

  The cover substrate may be a glass substrate.

  According to said structure, since a cover board | substrate is a glass substrate, a touch panel is protected by the glass substrate by which the end surface was reinforced, for example.

  The display panel may be a liquid crystal display panel.

  According to said structure, since a display panel is a liquid crystal display panel, deterioration of the linear polarizing plate affixed on both surfaces of the liquid crystal display panel is suppressed.

  The display panel may be an organic electroluminescence display panel.

  According to the above configuration, since the display panel is an organic electroluminescence (hereinafter also referred to as “EL”) display panel, a circle attached as an antireflection film on the surface of the organic EL display panel on the touch panel side. Degradation of the polarizing plate is suppressed.

  The touch panel layer may constitute a capacitive touch panel.

  According to the above configuration, since the touch panel layer constitutes a capacitive touch panel, the projection type capable of multi-point detection (multi-touch) and the surface type capacitive touch panel with a simple structure and low cost. A display device including the above is specifically configured.

  Further, in the method for manufacturing a display device according to the present invention, a polarizing plate is attached to at least one surface of a touch panel provided with a transparent substrate that absorbs ultraviolet rays and a touch panel layer provided on the transparent substrate. A panel affixing step for affixing the display panel from the polarizing plate side, and a cover substrate having a frame-shaped light-shielding layer provided at the peripheral edge on the transparent substrate side of the touch panel to which the display panel is affixed. A substrate disposing step of disposing via a UV curable adhesive material from the layer side; and an ultraviolet irradiation step of irradiating the adhesive material between the transparent substrate and the cover substrate with ultraviolet light from the cover substrate side.

  According to said method, in the board | substrate arrangement | positioning process performed after the panel sticking process which affixes the display panel by which the polarizing plate was affixed on the at least one surface to the touchscreen layer side of a touchscreen, in a transparent substrate side of a touchscreen, a frame The cover substrate with the light shielding layer in the shape of the periphery is placed via an ultraviolet-curing adhesive material, so it is generally viscoelastic even if a surface step due to the light shielding layer is formed on the cover substrate. Generation of bubbles in the pressure-sensitive adhesive material is suppressed by spreading the UV curable pressure-sensitive adhesive material having a low level following the surface level difference. In the subsequent ultraviolet irradiation process, the ultraviolet curable adhesive material is irradiated with ultraviolet light from the cover substrate side, so that the transparent substrate of the touch panel is affixed to at least one surface of the display panel by absorbing the ultraviolet light. The ultraviolet rays hardly reach the polarizing plate, and the deterioration of the polarizing plate is suppressed. Therefore, the bubble generation in the adhesive material due to the light shielding layer of the cover substrate is suppressed, and the deterioration of the polarizing plate is suppressed.

  According to the present invention, an ultraviolet curable adhesive material is disposed between the touch panel and the cover substrate, and the transparent substrate of the touch panel absorbs ultraviolet rays, so that generation of bubbles in the adhesive material due to the light shielding layer of the cover substrate is suppressed. Thus, deterioration of the polarizing plate can be suppressed.

1 is a cross-sectional view of a display device according to Embodiment 1. FIG. 3 is a plan view schematically showing a touch panel layer of a touch panel constituting the display device according to Embodiment 1. FIG. FIG. 5 is a first explanatory view showing the manufacturing process of the display device according to the first embodiment in cross section. FIG. 6 is a second explanatory view showing the manufacturing process of the display device according to the first embodiment in cross section. FIG. 10 is a third explanatory diagram showing the manufacturing process of the display device according to the first embodiment in cross section. FIG. 10 is a fourth explanatory view, in section, showing a manufacturing process for the display device according to the first embodiment. 6 is a cross-sectional view of a display device according to Embodiment 2. FIG. It is sectional drawing of the display apparatus which concerns on Embodiment 3. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

Embodiment 1 of the Invention
1 to 6 show Embodiment 1 of a display device and a manufacturing method thereof according to the present invention. Here, FIG. 1 is a cross-sectional view of the liquid crystal display device 50a of the present embodiment. FIG. 2 is a plan view schematically showing the touch panel layer 16a of the touch panel 20a constituting the liquid crystal display device 50a. In the cross-sectional view of FIG. 1, the portion of the touch panel 20a is along the line AA in FIG.

  As shown in FIG. 1, the liquid crystal display device 50a includes a liquid crystal display panel 35a, linear polarizing plates 36 and 37 attached to both surfaces of the liquid crystal display panel 35a, that is, an upper surface and a lower surface in the drawing, and liquid crystal A projected capacitive touch panel 20a attached to the linear polarizing plate 36 side of the display panel 35a via the adhesive material 25 and an adhesive material 45 attached to the transparent substrate 11b side to be described later of the touch panel 20a. And a backlight (not shown) provided on the linear polarizing plate 37 side of the liquid crystal display panel 35a.

  As shown in FIG. 1, the liquid crystal display panel 35a includes, for example, a TFT (Thin Film Transistor) substrate 31a and a CF (Color Filter) substrate 32a provided to face each other, and between the TFT substrate 31a and the CF substrate 32a. The liquid crystal layer 33a provided on the TFT substrate 31a and the TFT substrate 31a and the CF substrate 32a are bonded to each other, and a sealing material 34a provided to enclose the liquid crystal layer 33a between the TFT substrate 31a and the CF substrate 32a is provided. Yes.

  The TFT substrate 31a includes, for example, a glass substrate having a thickness of about 0.25 mm, a plurality of gate lines provided on the glass substrate so as to extend in parallel with each other, and gate insulation provided so as to cover each gate line. A film, a plurality of source lines provided on the gate insulating film so as to extend in parallel to each other in a direction perpendicular to the gate lines, and each gate line and each intersection of the source lines, that is, a minimum unit of an image A plurality of TFTs provided for each subpixel, an interlayer insulating film provided to cover each TFT, and a plurality of TFTs provided in a matrix on the interlayer insulating film and connected to each TFT And an alignment film provided so as to cover each pixel electrode.

  The CF substrate 32a includes, for example, a glass substrate having a thickness of about 0.15 mm, a black matrix provided in a lattice shape on the glass substrate, and a red layer and a green layer provided between the lattices of the black matrix, respectively. And a plurality of colored layers such as a blue layer, a common electrode provided so as to cover each colored layer and the black matrix, a plurality of photo spacers provided in a columnar shape on the common electrode, and each photo spacer and common electrode And an alignment film provided so as to cover the surface.

  The liquid crystal layer 33a is made of, for example, a nematic liquid crystal material having electro-optical characteristics.

  As shown in FIG. 1, the touch panel 20 a includes a transparent substrate 11 b provided on the adhesive material 45 side and a touch panel layer 16 a provided on the linear polarizing plate 36 side of the transparent substrate 11 b. Further, as shown in FIG. 1, for example, an FPC (Flexible Printed Circuit) 19 for connecting to an external position detection circuit or the like is provided at the end of the touch panel 20a via an ACF (Anisotropic Conductive Film, not shown). It is crimped.

  The transparent substrate 11b is, for example, a polyimide substrate having a thickness of about 3 μm to 20 μm that absorbs light with a wavelength of 365 nm or less, that is, ultraviolet rays. In the present embodiment, a polyimide substrate is exemplified as the transparent substrate 11b. However, the transparent substrate 11b may be, for example, an acrylic substrate that absorbs ultraviolet rays.

  As shown in FIGS. 1 and 2, the touch panel layer 16 a includes a plurality of first transparent wiring patterns 12 provided so as to extend in parallel with each other on the transparent substrate 11 b, and in a direction orthogonal to the first transparent wiring patterns 12. The plurality of second transparent wiring patterns 14 provided so as to extend in parallel to each other, and the plurality of first transparent wiring patterns 12 and the plurality of second transparent wiring patterns 14 are provided in island shapes, respectively, A plurality of insulating layers 13 for electrically insulating the first transparent wiring pattern 12 and the second transparent wiring pattern 14, and the first transparent wiring patterns 12, the insulating layers 13 and the second transparent wiring patterns 14 are covered. And a protective film 15 provided as described above. Here, the 1st transparent wiring pattern 12 and the 2nd transparent wiring pattern 14 are comprised by transparent conductive films, such as an ITO (Indium Tin Oxide) film | membrane, for example. The insulating layer 13 and the protective film 15 are made of, for example, a colorless and transparent resin material.

  The cover substrate 41 is, for example, a glass substrate whose end surface is reinforced by removing cracks on the end surface by wet etching or the like. Further, as shown in FIG. 1, a frame-shaped light shielding layer 42 is provided at the peripheral end of the cover substrate 41 on the adhesive material 45 side. Here, the light shielding layer 42 is formed to a thickness of about 10 μm to 20 μm by, for example, a resin material in which a black pigment is dispersed. In the present embodiment, a glass substrate is exemplified as the cover substrate 41, but the cover substrate 41 may be a colorless and transparent resin substrate.

  The adhesive material 25 is, for example, an acrylic transparent adhesive sheet having a thickness of about 50 μm.

The adhesive material 45 is, for example, an ultraviolet curable transparent adhesive sheet having a thickness of about 10 μm to 50 μm. Here, the viscoelasticity of the adhesive material 45 is, for example, about 1 × 10 ⁵ Pa at room temperature (about 25 ° C.) and about 1 × 10 ⁴ Pa at the time of heating (about 50 ° C.).

  The liquid crystal display device 50a configured as described above transmits light transmitted from the backlight through the liquid crystal display panel 35a by applying a predetermined voltage to the liquid crystal layer 33a between the TFT substrate 31a and the CF substrate 32a for each subpixel. The rate is adjusted to display an image via the touch panel 20a, and the surface of the cover substrate 41 on the touch panel 20a is touched, so that the first transparent wiring pattern 12 and the second transparent wiring pattern 14 are crossed. The position detection circuit is configured to calculate and detect the touched position based on the generated change in capacitance.

  Next, the manufacturing method of the liquid crystal display device 50a of this embodiment is demonstrated using FIGS. Here, FIG. 3, FIG. 4, FIG. 5 and FIG. 6 are first, second, third, and fourth explanatory views respectively showing the manufacturing process of the liquid crystal display device in section. In addition, the manufacturing method of the liquid crystal display device 50a of this embodiment includes a liquid crystal display panel manufacturing process, a touch panel manufacturing process, a panel pasting process, a substrate arranging process, and an ultraviolet irradiation process.

<Liquid crystal display panel manufacturing process>
First, a TFT substrate 31a is manufactured by forming a gate line, a source line, a TFT, a pixel electrode, and the like on the surface of the glass substrate using a known method.

  Further, a CF substrate 32a is manufactured by forming a black matrix, a colored layer, a common electrode, a photo spacer, and the like on the surface of the glass substrate using a known method.

  Subsequently, for example, using a dispenser, the sealing material 34a is drawn in a frame shape on the surface of the CF substrate 32a.

  Thereafter, a liquid crystal material (33a) is dropped onto a region surrounded by the sealing material 34a of the CF substrate 32a on which the sealing material 34a is drawn.

  Then, the CF substrate 32a onto which the liquid crystal material (33a) is dropped and the TFT substrate 31a are bonded together under reduced pressure, and then released to atmospheric pressure to pressurize the surfaces of the TFT substrate 31a and the CF substrate 32a. Further, the liquid crystal display panel 35a in which the liquid crystal layer 33a is sealed between the TFT substrate 31a and the CF substrate 32a is manufactured by curing the seal 34a.

  Further, linear polarizing plates 36 and 37 are attached to both surfaces of the liquid crystal display panel 35a.

<Touch panel manufacturing process>
First, as shown in FIG. 3A, after forming a coating film 11a made of a polyimide resin on the surface of the glass substrate 10 by applying a liquid polyimide resin material using a slit coater C, for example. As shown in FIG. 3B, the transparent film 11b is formed by baking and imidizing the coating film 11a. Here, the polyimide resin material used as the coating film 11a is obtained by dissolving polyamic acid, which is a precursor of polyimide, in an organic solvent such as dimethylacetamide or N-methylpyrrolidone.

  Subsequently, the first transparent wiring pattern 12, the insulating layer 13, the second transparent wiring pattern 14, the protective film 15 and the like are formed on the transparent substrate 11b formed on the glass substrate 10 by using a known method. Then, the touch panel layer 16a is formed, and the touch panel 20a is produced as shown in FIG.

  And after affixing the protective film 17 so that the touch panel 20a may be covered, as shown to Fig.4 (a), the glass substrate 10 is peeled from the transparent substrate 11b by irradiating the laser beam L from the glass substrate 10 side. Let

  Further, as shown in FIG. 4B, after the protective film 18 is attached to the lower surface of the transparent substrate 11b in the drawing and the upper protective film 17 in the drawing is removed, the ACF is attached to the end of the transparent substrate 11b. The FPC 19 is pressure-bonded via

<Panel pasting process>
As shown in FIG. 5, after the adhesive material 25 is disposed on the surface of the linear polarizing plate 36 of the liquid crystal display panel 35a to which the linear polarizing plates 36 and 37 are attached in the liquid crystal display panel manufacturing step, the surface of the adhesive material 25 The liquid crystal display panel 35a is affixed from the linear polarizing plate 36 side to the touch panel layer 16a side of the touch panel 20a by disposing the touch panel 20a to which the FPC 19 is pressure-bonded in the touch panel manufacturing process.

<Board placement process>
After the adhesive material 45 is disposed on the surface of the transparent substrate 11b of the touch panel 20a to which the liquid crystal display panel 35a is adhered in the panel pasting step, the cover substrate 41 provided with the light shielding layer 42 is shielded from light on the surface of the adhesive material 45. It arrange | positions from the layer 42 side (refer FIG. 6). Here, after disposing the cover substrate 41 on the surface of the adhesive material 45, the entire object to be processed including the touch panel 20 a to which the liquid crystal display panel 35 a is attached, the adhesive material 45, and the cover substrate 41 is, for example, about 50 ° C. By heating, the viscosity of the adhesive material 45 decreases, and the adhesive material 45 quickly follows the surface step caused by the light shielding layer 42 of the cover substrate 41.

<Ultraviolet irradiation process>
As shown in FIG. 6, the adhesive material 45 is bonded to the adhesive material 45 by irradiating the adhesive material 45 between the transparent substrate 11b and the cover substrate 41 with ultraviolet rays U from the cover substrate 41 side. Then, the transparent substrate 11b and the cover substrate 41 are bonded to each other through the adhesive material 45 (the adhesive material 45 is cured). The portion of the adhesive material 45 shielded by the light shielding layer 42 includes ultraviolet light incident obliquely with respect to the surface of the cover substrate 41, the surface of the transparent substrate 11b (upper surface in FIG. 6), and the light shielding layer 42. It is cured by the reflected light of ultraviolet light on the surface (the lower surface in FIG. 6).

  As described above, the liquid crystal display device 50a of this embodiment can be manufactured.

  As described above, according to the liquid crystal display device 50a and the manufacturing method thereof of the present embodiment, the liquid crystal display panel 35a in which the linearly polarizing plates 36 and 37 are attached to both surfaces on the touch panel layer 16a side of the touch panel 20a. In the substrate placement step performed after the panel pasting step for pasting the cover substrate 41, the cover substrate 41 having the frame-shaped light shielding layer 42 provided on the peripheral end portion is provided on the transparent substrate 11 b side of the touch panel 20 a via the ultraviolet curable adhesive material 45. Therefore, even when a surface step due to the light shielding layer 42 is formed on the cover substrate 41, the UV curable adhesive material 45 having generally low viscoelasticity expands following the surface step, thereby causing adhesion. Generation of bubbles in the material 45 can be suppressed. In the subsequent ultraviolet irradiation process, the ultraviolet curable adhesive material 45 is irradiated with ultraviolet rays U from the cover substrate 41 side, so that the transparent substrate 11b of the touch panel 20a absorbs the ultraviolet rays U, thereby Ultraviolet rays U hardly reach the linearly polarizing plates 36 and 37 attached to the surface, and the deterioration of the linearly polarizing plates 36 and 37 can be suppressed. Accordingly, the generation of bubbles in the adhesive material 45 caused by the light shielding layer 42 of the cover substrate 41 can be suppressed, deterioration of the linearly polarizing plates 36 and 37 can be suppressed, and high contrast display quality can be maintained. .

  Further, according to the liquid crystal display device 50a of the present embodiment, since the transparent substrate 11b of the touch panel 20a absorbs the ultraviolet rays U, it is possible to suppress deterioration of the linearly polarizing plates 36 and 37 due to external light, and to improve reliability. Can be made.

  Moreover, according to the liquid crystal display device 50a of this embodiment, since the transparent substrate 11b of the touch panel 20a is a polyimide substrate, the weight of the touch panel 20a can be reduced.

<< Embodiment 2 of the Invention >>
FIG. 7 is a cross-sectional view of the liquid crystal display device 50b of the present embodiment. In addition, in each following embodiment, the same code | symbol is attached | subjected about the same part as FIGS. 1-6, and the detailed description is abbreviate | omitted.

  In the first embodiment, the liquid crystal display device 50a including the projected capacitive touch panel 20a is illustrated. However, in the present embodiment, the liquid crystal display device 50b including the surface capacitive touch panel 20b is illustrated. Is illustrated.

  As shown in FIG. 7, the liquid crystal display device 50b includes a liquid crystal display panel 35a, linear polarizing plates 36 and 37 attached to both surfaces of the liquid crystal display panel 35a, that is, an upper surface and a lower surface in the drawing, and liquid crystal A surface-type capacitive touch panel 20b attached to the linear polarizing plate 36 side of the display panel 35a via the adhesive material 25, and an adhesive material 45 attached to the transparent substrate 11b side of the touch panel 20b. A cover substrate 41 and a backlight (not shown) provided on the linear polarizing plate 37 side of the liquid crystal display panel 35a are provided.

  As shown in FIG. 7, the touch panel 20 b includes a transparent substrate 11 b provided on the adhesive material 45 side and a touch panel layer 16 b provided on the linear polarizing plate 36 side of the transparent substrate 11 b. Further, as shown in FIG. 7, for example, an FPC 19 for connecting to an external position detection circuit or the like is pressure-bonded to the end of the touch panel 20b via an ACF.

  As shown in FIG. 7, the touch panel layer 16b includes a transparent electrode 12a provided in a rectangular shape on the transparent substrate 11b, and a frame wiring (linearization pattern, non-uniformity) provided in a frame shape along the peripheral edge of the transparent electrode 12a. And four lead wires (not shown) each drawn from four corners of the frame wire, and a protective film 15 provided so as to cover the transparent electrode 12a, the frame wire and each lead wire. Yes. Here, the transparent electrode 12a is made of a transparent conductive film such as an ITO (Indium Tin Oxide) film. Further, the frame wiring and the lead wiring are made of, for example, a transparent conductive film or a metal conductive film.

  The liquid crystal display device 50b of the present embodiment forms the transparent electrode 12a, the frame wiring, the lead-out wiring, the protective film 15 and the like on the transparent substrate 11b using a known method in the touch panel manufacturing process of the first embodiment. Thus, it can be manufactured by forming the touch panel layer 16b instead of the touch panel layer 16a.

  As described above, according to the liquid crystal display device 50b and the manufacturing method thereof according to the present embodiment, the ultraviolet curable adhesive material 45 is disposed between the touch panel 20b and the cover substrate 41 as in the first embodiment. Since the transparent substrate 11b of the touch panel 20b absorbs ultraviolet rays U, generation of bubbles in the adhesive material 45 due to the light shielding layer 42 of the cover substrate 41 can be suppressed, and deterioration of the linearly polarizing plates 36 and 37 can be suppressed. , High contrast display quality can be maintained.

<< Embodiment 3 of the Invention >>
FIG. 8 is a cross-sectional view of the organic EL display device 50c of this embodiment.

  In the first and second embodiments, the liquid crystal display devices 50a and 50b including the touch panel are illustrated, but in this embodiment, the organic EL display device 50c including the touch panel is illustrated.

  As shown in FIG. 8, the organic EL display device 50c includes an organic EL display panel 35b, a circularly polarizing plate 38 attached as an antireflection film on one surface of the organic EL display panel 35b, that is, the upper surface in the drawing. The electrostatic capacitance type touch panel 20a attached to the circularly polarizing plate 38 side of the organic EL display panel 35b via the adhesive material 25, and the adhesive material 45 attached to the transparent substrate 11b side of the touch panel 20a. And an attached cover substrate 41.

  As shown in FIG. 8, the organic EL display panel 35b includes, for example, an insulating substrate 31b and a sealing substrate 32b provided so as to face each other, and an organic EL provided between the insulating substrate 31b and the sealing substrate 32b. The structure 33b and the insulating substrate 31b and the sealing substrate 32b are bonded to each other, and a sealing material 34b provided to enclose the organic EL structure 33b between the insulating substrate 31b and the sealing substrate 32b is provided. Yes.

  The organic EL structure 33b has a structure in which, for example, a hole injection electrode, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection electrode are sequentially stacked from the insulating substrate 31b to the sealing substrate 32b. doing.

  The circularly polarizing plate 38 includes, for example, a linear polarizing plate and a retardation plate laminated on the linear polarizing plate.

  The organic EL display device 50c of the present embodiment is manufactured by manufacturing the organic EL display panel 35b instead of the liquid crystal display panel 35a using a known method in the liquid crystal display panel manufacturing process of the first embodiment. be able to.

  As described above, according to the organic EL display device 50c and the manufacturing method thereof of the present embodiment, the organic EL display panel 35b in which the circularly polarizing plate 38 is attached to one surface on the touch panel layer 16a side of the touch panel 20a. In the substrate placement step performed after the panel pasting step for pasting the cover substrate 41, the cover substrate 41 having the frame-shaped light shielding layer 42 provided on the peripheral end portion is provided on the transparent substrate 11 b side of the touch panel 20 a via the ultraviolet curable adhesive material 45. Therefore, even when a surface step due to the light shielding layer 42 is formed on the cover substrate 41, the UV curable adhesive material 45 having generally low viscoelasticity expands following the surface step, thereby causing adhesion. Generation of bubbles in the material 45 can be suppressed. In the subsequent ultraviolet irradiation process, the ultraviolet curable adhesive 45 is irradiated with the ultraviolet rays U from the cover substrate 41 side, so that the transparent substrate 11b of the touch panel 20a absorbs the ultraviolet rays U, whereby the organic EL display panel 35b. It becomes difficult for the ultraviolet rays U to reach the circularly polarizing plate 38 attached to one surface, and deterioration of the circularly polarizing plate 38 can be suppressed. Accordingly, the generation of bubbles in the adhesive material 45 caused by the light shielding layer 42 of the cover substrate 41 can be suppressed, deterioration of the circularly polarizing plate 38 can be suppressed, and high contrast display quality can be maintained.

  In the present embodiment, the organic EL display device 50c in which the organic EL display panel 35b is attached to the projected capacitive touch panel 20a of the first embodiment is illustrated, but the surface type of the second embodiment is used. An organic EL display device in which an organic EL display panel 35b is attached to a capacitive touch panel 20b may be used.

  In each of the above embodiments, a liquid crystal display device and an organic EL display device are exemplified as the display device. However, the present invention is applicable to other display devices such as an electrowetting method and a MEMS (Micro Electro Mechanical System) method. Can be applied.

  As described above, the present invention can suppress the generation of bubbles in the adhesive material due to the light shielding layer of the cover substrate and suppress the deterioration of the polarizing plate. Therefore, the present invention can be used for mobile applications such as smartphones and tablet terminals. Useful for electronic equipment.

U ultraviolet ray 11b transparent substrate 16a, 16b touch panel layer 20a, 20b touch panel 35a liquid crystal display panel 35b organic EL display panel 36, 37 linearly polarizing plate 38 circularly polarizing plate 41 cover substrate 42 light shielding layer 45 adhesive material 50a-50c display device

Claims (8)

A display panel having a polarizing plate attached to at least one surface;
A touch panel affixed to the polarizing plate side of the display panel;
A cover substrate that is attached to the touch panel via an ultraviolet curable adhesive, and a frame-shaped light shielding layer is provided on a peripheral edge of the adhesive;
The said touch panel is a display apparatus provided with the transparent substrate which absorbs the ultraviolet-ray provided in the said adhesive material side, and the touch-panel layer provided in the said polarizing plate side of this transparent substrate.   The display device according to claim 1, wherein the transparent substrate absorbs light having a wavelength of 365 nm or less.   The display device according to claim 1, wherein the transparent substrate is a polyimide substrate.   The display device according to claim 1, wherein the cover substrate is a glass substrate.   The display device according to claim 1, wherein the display panel is a liquid crystal display panel.   The display device according to claim 1, wherein the display panel is an organic electroluminescence display panel.   The display device according to claim 1, wherein the touch panel layer constitutes a capacitive touch panel. A panel in which a polarizing plate is attached to at least one surface on the touch panel layer side of a touch panel provided with a transparent substrate that absorbs ultraviolet light and a touch panel layer provided on the transparent substrate. Pasting process,
A substrate disposing step of disposing a cover substrate provided with a frame-shaped light-shielding layer at a peripheral end portion on the transparent substrate side of the touch panel to which the display panel is attached from the light-shielding layer side through an ultraviolet curable adhesive material When,
A method of manufacturing a display device, comprising: an ultraviolet irradiation step of irradiating the adhesive material between the transparent substrate and the cover substrate with ultraviolet rays from the cover substrate side.

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