JP2010205144A - Touch panel incorporated display and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a touch panel incorporated display capable of connecting a touch panel and a display without giving damage to the configuration of the touch panel and the display. <P>SOLUTION: An activating solution L2 is electively sprayed toward a non-transparent area 5 where a thin film resin layer 13 is formed on a liquid crystal device 1 and the touch panel 50 (refer to Fig.2 (d)). When the activating solution L2, such as ozone water is sprayed over the thin film resin layer 13, atomic active oxygen oxidizes (activates) a silicone resin and a denatured silicon resin which constitute the thin film resin layer 13 to reform to an adhesive layer 9 which expresses adhesion. Consequently, the adhesive layer 9 having adhesion is formed on the non-transparent area 5 in a joint surface 1a of the liquid crystal device (display) 1, and a joint surface 50a of the touch panel 50. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

   The present invention relates to a touch panel integrated display device and a manufacturing method thereof, and more particularly, to a joining technique for integrally joining a touch panel and a display device.

   The touch panel is a device that is provided on the front surface of a display device such as an LCD and inputs a signal to an electronic device equipped with the device by pressing the surface with a finger or a dedicated pen. Since the display surface can be used as an input device as it is, it is very excellent as a man-machine interface and is widely used regardless of the consumer industry. It is expected that the demand will continue to increase in the future.

   Such a touch panel integrated display device in which a touch panel and a display device are integrated is widely used, for example, as a display or input device for a mobile phone, a notebook computer, a digital camera, or the like. Such a touch panel integrated display device is formed by bonding a display device such as an LCD and a touch panel. In joining, a transparent (light-transmitting) adhesive film is generally provided between the touch panel and the display device, and the touch panel and the display device are attached by this adhesive film (see Patent Document 1). Moreover, what apply | coated the photocurable resin to the joining surface of a touchscreen and a display apparatus, and it hardened | cured by light irradiation and joined was also known.

Japanese Patent Laid-Open No. 11-181382

   However, in the invention described in Patent Document 1, the adhesive film that integrates the touch panel and the display device has a film thickness of about 50 to 500 μm, and there is a problem that the thickness of the touch panel integrated display device is greatly increased. there were. Further, when such a thick adhesive film is provided between the touch panel and the display device, there is a problem that the visibility of the display device is lowered.

   On the other hand, what apply | coated the photocurable resin to the joint surface of a touchscreen and a display apparatus comprises the peripheral part of a touchscreen and a display apparatus, or a touchscreen, when irradiating light to a photocurable resin and hardening. The light does not reach the photocurable resin applied to the light non-transmissive region such as the formation portion of the spacer member that separates the base materials of the sheets. For this reason, there exists a concern that the photocurable resin which was not hardened will ooze out to the periphery and have a bad influence.

   Some aspects according to the present invention have been made in view of the above circumstances, and provide a touch panel integrated display device that can be thinned while maintaining good visibility of the display device.

   Moreover, the manufacturing method of the touchscreen integrated display apparatus which can join a touchscreen and a display apparatus without giving a damage to the structure of a touchscreen or a display apparatus is provided.

In order to solve the above-described problems, some aspects of the present invention provide the following touch panel integrated display device and manufacturing method thereof.
That is, the touch panel integrated display device of the present invention is a touch panel integrated display device in which the touch panel and the display device are integrally bonded at the bonding surface, and the bonding surface is a thin film containing a silicone resin or a modified silicone resin. It is characterized by comprising an adhesive layer in which the resin layer is activated to develop adhesiveness.

The adhesive layer is preferably formed in a non-transmissive region excluding a region where display light of the display device is emitted from the surface of the touch panel.
The non-transmissive region is preferably a region where a spacer member for separating the peripheral portions of the touch panel and the display device and / or the two substrates constituting the touch panel is separated.
The adhesive layer preferably has a thickness of 10 μm or less.

   The method for manufacturing a touch panel integrated display device according to the present invention is a method for manufacturing a touch panel integrated display device in which the touch panel and the display device are integrally bonded to each other at a bonding surface, of the touch panel and the bonding surface of the display device. , Spraying a resin solution in which a solute containing a silicone resin or a modified silicone resin is dissolved in an organic solvent toward at least one of the bonding surfaces to selectively form a thin film resin layer in an arbitrary region of the bonding surface A step of activating the thin film resin layer with an activating means to modify the adhesive layer in which the thin film resin layer exhibits adhesiveness; and the touch panel and the display device with the adhesive layer And the step of joining via.

It is preferable to further include a step of evaporating and drying the organic solvent of the sprayed resin solution.
The activating means is preferably any one of ultraviolet irradiation, atmospheric pressure plasma irradiation, and ozone water injection.
The thin film resin layer is preferably formed in a non-transmissive region excluding a region where display light of the display device is emitted from the surface of the touch panel.
The non-transmissive region is preferably a region where a spacer member that separates the peripheral portions of the touch panel and the display device and / or the two base materials constituting the touch panel is separated.
The thin film resin layer is preferably formed to have a thickness of 10 μm or less.

It is a principal part expanded sectional view which shows the touchscreen integrated display apparatus of this invention. It is the principal part expanded sectional view which showed the manufacturing method of the touchscreen integrated display device of this invention in steps. It is the figure which showed the structural formula of resin which comprises a thin film resin layer. It is the figure which showed the structural formula of resin which comprises a thin film resin layer. It is the figure which showed the structural formula of resin which comprises a thin film resin layer. It is the figure which showed the structural formula of resin which comprises a thin film resin layer. It is the figure which showed the structural formula of resin which comprises a thin film resin layer.

   The best mode of the touch panel integrated display device of the present invention will be described. The present embodiment is specifically described for better understanding of the gist of the invention, and does not limit the invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there is a case where a main part is shown in an enlarged manner for convenience, and the dimensional ratio of each component is the same as the actual one. Not necessarily.

FIG. 1 is an enlarged cross-sectional view of a main part showing a touch panel integrated display device of the present invention. In the following description, the touch input side of each component of the touch panel is referred to as the front side, and the opposite side is referred to as the back side.
The touch panel integrated display device 100 has a touch panel 50 arranged on the image display side (front side) of a liquid crystal device (display device) 1 that is an image display device. In the liquid crystal device 1, a pair of a lower substrate 10 and an upper substrate 20 made of a transparent material such as glass are disposed to face each other. A spacer (not shown) is disposed between the substrates 10 and 20, and the distance between the substrates 10 and 20 is maintained at, for example, about 5 μm. Further, the peripheral portions of the substrates 10 and 20 are joined by a sealing material 30 made of an adhesive such as a thermosetting type or an ultraviolet curable type. Liquid crystal material such as STN (Super Twisted Nematic) liquid crystal is sealed in a space surrounded by the substrates 10 and 20 and the sealing material 30.

   On the inner surface of the lower substrate 10, common electrodes 12 made of a transparent conductive material such as ITO are formed in stripes. On the inner surface of the upper substrate 20, segment electrodes 22 made of a transparent conductive material such as ITO are formed in stripes. The segment electrode 22 and the common electrode 12 are arranged so as to be orthogonal to each other, and the vicinity of the intersection is a pixel of the liquid crystal device.

   On the other hand, an incident side polarizing plate 18 is disposed outside the lower substrate 10, and an output side polarizing plate 28 is disposed outside the upper substrate 20. The incident side polarizing plate 18 and the outgoing side polarizing plate 28 are arranged so that their transmission axes intersect at a predetermined angle (for example, about 90 °). In addition, the backlight 2 is disposed outside the incident side polarizing plate 18.

   On the inner surface of the lower substrate, red (R), green (G), and blue (B) color material layers 16R, 16G, and 16B that form color filters are formed corresponding to the plurality of pixels 4. A light shielding film 15 is formed between the color material layers 16R, 16G, and 16B to prevent light leakage from the adjacent pixels 4. Further, a planarizing film (protective film) 17 is formed on the surface of each color material layer 16R, 16G, 16B and the light shielding film 15, and the common electrode 12 is formed on the surface of the planarizing film 17. On the surface of the common electrode 12, an alignment film 14 for regulating the alignment state of the liquid crystal when no electric field is applied is formed.

   On the other hand, a segment electrode 22 is formed on the inner surface of the upper substrate 20. On the surface of the segment electrode 22, an alignment film 24 for regulating the alignment state of the liquid crystal when no voltage is applied is formed. It should be noted that the alignment directions of the liquid crystal by the alignment film 24 of the upper substrate 20 and the alignment direction of the liquid crystal by the alignment film 14 of the lower substrate 10 intersect each other at a predetermined angle (for example, about 90 °). Is formed.

   When the light from the backlight 2 enters the incident side polarizing plate 18, only linearly polarized light along the transmission axis of the incident side polarizing plate 18 is transmitted through the incident side polarizing plate 18. The linearly polarized light transmitted through the incident side polarizing plate 18 rotates in accordance with the alignment state of the liquid crystal when no electric field is applied in the process of transmitting through the liquid crystal layer 35 sandwiched between the substrates 10 and 20. Of the linearly polarized light that has passed through the liquid crystal layer 35, only the component that matches the transmission axis of the exit-side polarizing plate 28 passes through the exit-side polarizing plate 28.

   Further, when a data signal is supplied to one of the common electrode 12 and the segment electrode 22 and a scanning signal is supplied to the other, a voltage is applied to the liquid crystal layer 35 disposed in the pixel 4 at the intersection of the electrodes 12 and 22. Is done. The alignment state of the liquid crystal molecules changes according to the voltage level, and the optical rotation angle of the linearly polarized light incident on the liquid crystal layer 35 is adjusted. Thereby, the light transmittance is controlled for each pixel 4 of the liquid crystal device 1, and image display is performed.

   Next, the touch panel 50 will be described. The touch panel 50 includes a touch panel substrate (one base material) 41 made of a transparent material such as glass, and a cover film (the other base material) that is disposed to be opposed to the touch input surface 41a of the touch panel substrate 41 so as to form a pair. 42. The cover film 42 is formed into a flexible film from a transparent material such as polyethylene terephthalate (PET), polycarbonate (PC), acrylic, or cellulose triacetate (TAC). The surface of the cover film 42 may be subjected to an antireflection treatment such as AR coating.

   An insulating film 44, an anisotropic conductive paste 60, an FPC board 70, and the like are disposed on the peripheral edge between the touch panel substrate 41 and the cover film 42, and are bonded together by an adhesive (not shown) or the like. A large number of spacer members 43 are arranged between the touch panel substrate (one base material) 41 and the cover film (the other base material) 42. By this spacer member 43, the touch panel substrate (one base material) 41 and the cover film (the other base material) 42 are separated from each other while maintaining a predetermined gap.

   The liquid crystal device (display device) 1 having the above configuration and the touch panel 50 are integrally joined at the respective joint surfaces 1a and 50a to constitute the touch panel integrated display device 100. The liquid crystal device (display device) 1 and the touch panel 50 are joined by an adhesive layer 9 that activates a thin film resin layer containing a silicone resin or a modified silicone resin to develop adhesiveness.

   The adhesive layer 9 is formed by activating a thin film resin layer containing a silicone resin or a modified silicone resin to develop adhesiveness. The thickness Δt of the adhesive layer 9 is 1 μm or less, for example, about 100 to 200 nm. As a result, it is possible to significantly reduce the adhesive layer that has conventionally been 100 μm or more in thickness using a double-sided adhesive tape or the like. Therefore, the thickness of the entire touch panel integrated display device 100 can be reduced. A specific method for forming the adhesive layer 9 will be described later in detail in a method for manufacturing a touch panel integrated display device.

   Such an adhesive layer 9 is selectively formed in the non-transmissive region 5 excluding the formation region of the pixels 4 from which the display light of the liquid crystal device (display device) 1 is emitted from the surface of the touch panel 50. For example, the non-transmissive region 5 may be a peripheral region of the touch panel 50 and the liquid crystal device (display device) 1 or a region where the spacer member 43 is formed.

   Thus, by selectively forming the adhesive layer 9 for joining the liquid crystal device (display device) 1 and the touch panel 50 only in the non-transmissive region 5, the display light of the liquid crystal device (display device) 1 is emitted. In the region where the emitted pixels 4 are formed, the display light can be transmitted without being attenuated by the adhesive layer 9. Accordingly, even if the touch panel 50 is provided on the front side of the liquid crystal device (display device) 1, the liquid crystal device (display device) 1 can be observed clearly with high luminance.

Next, a manufacturing method of the touch panel integrated display device of the present invention will be described.
FIG. 2 is an enlarged cross-sectional view showing a main part of the manufacturing method of the touch panel integrated display device according to the present invention.
First, a liquid crystal device (display device) 1 and a touch panel 50 for bonding are prepared (see FIG. 2A). Next, the resin solution L1 is selectively sprayed only to specific regions of the bonding surface 1a of the liquid crystal device (display device) 1 and the bonding surface 50a of the touch panel 50 (see FIG. 2B). For example, the resin solution L1 is selectively formed in the non-transmissive region 5 excluding the formation region of the pixels 4 from which the display light of the liquid crystal device 1 is emitted. For example, the non-transmissive region 5 may be a peripheral region of the touch panel 50 and the liquid crystal device (display device) 1 or a region where the spacer member 43 is formed.

   When the resin solution L1 is selectively ejected to an arbitrary region, it is preferable to use a fluid ejecting apparatus, for example, a known ink jet printer. A resin solution L1 for forming a thin film resin layer, which will be described later, is ejected from the ejection head H constituting the fluid ejection device, for example, the peripheral portion of the touch panel 50 and the liquid crystal device (display device) 1, the formation region of the spacer member 43, or the like. Are selectively sprayed (applied) only to the non-transmissive region 5. At this time, the resin solution L1 may be formed so that the thickness Δt is about 100 to 200 nm, for example.

   The resin solution L1 ejected from the ejection head H is obtained by dissolving a solute containing at least a silicone resin or a modified silicone resin in an organic solvent. As the silicone resin, a linear polymer silicone oil composed of a siloxane bond, referred to as a straight silicone oil, may be used.

FIG. 3 is a diagram showing a structural formula of a main straight silicone oil.
There are mainly three types of straight silicone oils. That is, dimethyl silicone oil, methyl phenyl silicone oil, and methyl hydrogen silicone oil. Dimethyl silicone oil is one in which the side chain and terminal of polysiloxane are all substituted with methyl groups. Methylphenyl silicone oil is one in which a part of the side chain of polysiloxane is substituted with a phenyl group. The methyl hydrogen silicone oil is one in which a part of the side chain of the polysiloxane is replaced with hydrogen.

   On the other hand, as the modified silicone resin, among the straight silicone oils as described above, a modified silicone oil having an organic group introduced into the side chain or terminal may be used. This modified silicone oil mainly includes four types depending on the bonding position of the organic group to be substituted. That is, a side chain type, a both-end type, a single-end type, and a side-chain both-end type. Moreover, it can be divided into reactive silicone oil and non-reactive silicone oil depending on the nature of the organic group to be introduced.

   FIG. 4 is a diagram showing some structural formulas of side-chain type modified silicone oils among main modified silicone oils. This side chain type modified silicone oil is obtained by substituting a part of the side chain of polysiloxane with an organic group, and is divided into a reactive silicone oil and a non-reactive silicone oil by the introduced organic group.

   FIG. 5 is a diagram showing some structural formulas of both-end-type modified silicone oils among main modified silicone oils. In this both-end type modified silicone oil, both ends of polysiloxane are substituted with organic groups, and are classified into reactive silicone oil and non-reactive silicone oil depending on the introduced organic group.

   FIG. 6 is a diagram showing some structural formulas of one-end type modified silicone oil among main modified silicone oils. In this one-end type modified silicone oil, one end of polysiloxane is substituted with an organic group.

   FIG. 7 is a diagram showing several structural formulas of side-chain both-end-type modified silicone oils among the main modified silicone oils. In this modified side-chain modified silicone oil, the side chain of polysiloxane and both ends are substituted with organic groups.

Examples of the organic solvent for dispersing and dissolving the solute such as the silicone resin or the modified silicone resin as exemplified above include PEGMEA (propylene glycol monomethyl ether acetate), butyl cellosolve, cyclohexylbenzene, xylene and the like.
The composition example of the resin solution injected when forming the thin film resin layer 13 below is shown.
Silicone resin or modified silicone resin component 15% by weight
PEGMEA 70% by weight
Butyl cellosolve 10% by weight
Cyclohexylbenzene 3% by weight
Xylene 2% by weight

   In addition, coloring components, such as a pigment and dye, can also be further mix | blended with the resin solution mentioned above. Thereby, an arbitrary color tone can be imparted to the adhesive layer formed in the subsequent step.

   Next, the resin solution L1 is sprayed onto the non-transmissive region 5 of the bonding surfaces 1a and 50a, the applied liquid crystal device 1 and the touch panel 50 are dried, and the organic solvent component contained in the resin solution L1 is evaporated. Thereby, the thin resin layer 13 which is a thin film made of the above-described silicone resin or modified silicone resin is formed in the non-transmissive region 5 of the liquid crystal device 1 and the touch panel 50 (see FIG. 2C). Note that the liquid crystal device 1 and the touch panel 50 may be dried at 220 ° C. for about 30 minutes, for example.

   Next, the activation solution L2 is selectively sprayed toward the non-transmissive region 5 where the thin film resin layer 13 is formed on the liquid crystal device 1 and the touch panel 50 (see FIG. 2D). When the activation solution L2 is selectively ejected to the non-permeable region 5, it is preferable to use a fluid ejecting apparatus, for example, a known ink jet printer. An activation solution L2, which will be described later, is selectively ejected from the ejection head H constituting the fluid ejection apparatus only to the region where the thin film resin layer 13 of the bonding surfaces 1a and 50a is formed, that is, the non-transmission region 5. Note that the fluid ejecting apparatus that ejects the activation solution L2 may be a fluid ejecting apparatus that ejects the resin solution L1 that is the previous step. That is, the resin solution L1 and the activation solution L2 may be filled in separate ink tanks and switched and ejected. On the other hand, it is also preferable that the resin solution L1 and the activation solution L2 are ejected by separate fluid ejection devices.

The activation solution L2 only needs to be a solution capable of causing active oxygen in an atomic state to act on the thin film resin layer 13, and examples thereof include ozone water in which ozone (O ₃ ) is dissolved in water. . The ozone contained in this ozone water is easily decomposed in the form of O ₃ → O ₂ + O (atom). At the time of this decomposition, the ozone water is selectively injected by the active oxygen having a strong oxidizing ability. Oxidize. The activation solution L2 can be widely applied as long as it is a liquid that easily releases atomic active oxygen, such as hydrogen peroxide water, in addition to ozone water.

   Thus, when the activation solution L2 such as ozone water is sprayed onto the thin film resin layer 13, the atomic active oxygen oxidizes (activates) the silicone resin or the modified silicone resin that constitutes the thin film resin layer 13, thereby causing adhesion. The adhesive layer 9 is improved. Thereby, the adhesive layer 9 having adhesiveness is formed in the non-transmissive region 5 in the bonding surface 1a of the liquid crystal device (display device) 1 and the bonding surface 50a of the touch panel 50.

   As a means for activating the thin film resin layer 13 to develop adhesiveness, a method of activating the thin film resin layer by, for example, ultraviolet irradiation other than the above-described ozone water injection is also preferable. Moreover, the method of irradiating atmospheric pressure plasma irradiation toward the thin film resin layer 13, and expressing adhesiveness and obtaining the contact bonding layer 9 is also preferable.

   Thereafter, the bonding surface 1a of the liquid crystal device (display device) 1 and the bonding surface 50a of the touch panel 50 are made to face each other and pressed with a predetermined pressing force (see FIG. 2 (e)). Thereby, the liquid crystal device (display device) 1 and the touch panel 50 are joined by the adhesive layer 9 formed in the non-transmissive region 5. And the touchscreen integrated display device 100 which integrated the liquid crystal device (display device) 1 and the touchscreen 50 is obtained (refer FIG.2 (f)).

   As described above, according to the method for manufacturing a touch panel integrated display device of the present invention, the thin film resin layer 13 is selectively formed only in the liquid crystal device 1 and the non-transmissive region 5 of the touch panel 50 using the fluid ejection device, In the formation region of the pixel 4 from which the display light of the liquid crystal device (display device) 1 is emitted, the display light is displayed in the region where the display light of the liquid crystal device (display device) 1 is emitted. The adhesive layer 9 can transmit without being attenuated. Accordingly, even if the touch panel 50 is provided on the front side of the liquid crystal device (display device) 1, the liquid crystal device (display device) 1 can be observed clearly with high luminance.

   Moreover, since the thickness Δt of the adhesive layer 9 can be formed to be 1 μm or less, for example, about 100 to 200 nm, it is possible to significantly reduce the adhesive layer that has conventionally been 100 μm or more in thickness using a double-sided adhesive tape or the like. become. Therefore, the thickness of the entire touch panel integrated display device 100 can be reduced.

   Furthermore, if ozone water is used for the activation solution L2, ozone that has not contributed to oxidation quickly becomes oxygen molecules and diffuses without remaining on the substrate. Accordingly, there is no concern about environmental pollution, and the liquid crystal device (display device) 1 and the touch panel 50 can be safely joined.

1 .... Liquid crystal device (display device), 4..Pixel, 5..Non-transparent area, 9 .... Adhesive layer, 13 .... Thin resin layer, 50 ... Touch panel, 100 ... Touch panel integrated display device, L1 .. Resin solution, L2 .. Activation solution, H.

Claims (10)

A touch panel integrated display device in which a touch panel and a display device are integrally bonded at a bonding surface,
A touch panel integrated display device comprising an adhesive layer that activates a thin film resin layer containing a silicone resin or a modified silicone resin to develop adhesiveness on the bonding surface.    The touch panel integrated display device according to claim 1, wherein the adhesive layer is formed in a non-transmissive region excluding a region where display light of the display device is emitted from a surface of the touch panel.    The non-transmissive region is a region where a spacer member that separates the peripheral portions of the touch panel and the display device and / or the two base materials constituting the touch panel is formed. The touch panel integrated display device described.    The touch panel integrated display device according to claim 1, wherein the adhesive layer has a thickness of 10 μm or less. A method for manufacturing a touch panel integrated display device in which a touch panel and a display device are integrally bonded at a bonding surface,
A resin solution in which a solute containing a silicone resin or a modified silicone resin is dissolved in an organic solvent is sprayed toward at least one of the bonding surfaces of the touch panel and the display device. Forming a thin film resin layer selectively in the region;
A step of activating the thin film resin layer with an activating means to modify the thin film resin layer into an adhesive layer that exhibits adhesion;
Bonding the touch panel and the display device through the adhesive layer;
A method for manufacturing a touch panel integrated display device, comprising:    The method for manufacturing a touch panel integrated display device according to claim 5, further comprising a step of evaporating and drying an organic solvent of the sprayed resin solution.    7. The touch panel integrated display device manufacturing method according to claim 5, wherein the activating means is any one of ultraviolet irradiation, atmospheric pressure plasma irradiation, and ozone water injection.    The touch panel integrated type according to any one of claims 5 to 7, wherein the thin film resin layer is formed in a non-transmissive region excluding a region where display light of the display device is emitted from a surface of the touch panel. Manufacturing method of display device.    9. The non-transmissive region is a region for forming a spacer member that separates the peripheral portions of the touch panel and the display device and / or two substrates constituting the touch panel. A method for manufacturing a touch panel integrated display device according to any one of the preceding claims. 10. The method for manufacturing a touch panel integrated display device according to claim 5, wherein the thin film resin layer is formed to have a thickness of 10 [mu] m or less.

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