JP2008058861A - Electro-optical device, electronic apparatus, method for manufacturing electro-optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electro-optical device in which no positional deviation occurs between a function adding member and a display panel. <P>SOLUTION: The electro-optical device is, for example, a liquid crystal display device, and is equipped with a display panel such as a liquid crystal display panel, an adhesive layer, and the function adding member. The adhesive layer is constructed with a tape-shaped adhesive material and a resin having adhesiveness in hardening stronger than that of the adhesive material. The function adding member is, for example, a polarizing plate, a parallax barrier, a touch panel substrate, or the like, and is bonded to the display panel with both of the adhesive material and the hardened resin. Thus, by using the adhesive material and the resin together as the adhesive layer, the adhesiveness of the adhesive layer is strengthened, and occurrence of the positional deviation between the display panel and the function adding member is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electro-optical device suitable for displaying various information.

In recent years, technologies for reducing the weight and size of electronic devices have been developed. In mobile phones and personal digital assistants (PDAs) as well, liquid crystal display devices are used as display devices to reduce weight and size.

The liquid crystal display device mainly includes a liquid crystal display panel composed of a substrate formed of two opposing glass plates, a liquid crystal sandwiched between the two substrates, and an LED (Light Emitting Diode).
And a lighting device composed of a light guide plate having a light source on the end face thereof. In the liquid crystal display panel, polarizing plates are bonded to the upper and lower surfaces of the two substrates with an adhesive. As the adhesive, a tape-like acrylic pressure-sensitive adhesive material or a photocurable liquid resin that cures when irradiated with light is used.

The following Patent Document 1 describes a technique for bonding a touch panel to a surface support covering a liquid crystal display panel with a tape-like acrylic adhesive material in order to suppress the occurrence of a gap defect in the liquid crystal display panel. ing.

JP 7-105781 A

However, in the invention described in Patent Document 1, since a tape-like pressure-sensitive adhesive material is used as an adhesive, misalignment may occur between the touch panel and the liquid crystal display panel due to heating or vibration during the manufacturing process. In addition, when a photocurable liquid resin that is cured when irradiated with light is used as the adhesive, the resin often has a stronger adhesive force than the tape-like adhesive material. During application, there is a problem that the resin leaks from the edge of the substrate or bubbles are generated inside the resin.

The present invention has been made in view of the above points, and provides an electro-optical device capable of suppressing the occurrence of misalignment between a function addition member such as a polarizing plate and a touch panel and a display panel such as a liquid crystal display panel. The task is to do.

In one aspect of the present invention, the electro-optical device is provided on the outer surface of the display panel and the display panel, and has an adhesive force stronger than the adhesive force of the tape-like adhesive material and the adhesive material when cured. An adhesive layer made of resin, and a function adding member bonded to the display panel by the adhesive layer, the function adding member being bonded to the display panel by both the adhesive material and the cured resin Has been.

The electro-optical device is a liquid crystal display device, for example, and includes a display panel such as a liquid crystal display panel, an adhesive layer, and a function addition member. The adhesive layer is composed of a tape-like adhesive material and a resin having an adhesive strength stronger than that of the adhesive material when cured. The function addition member is, for example, a polarizing plate, a parallax barrier, a touch panel substrate, and the like, and is bonded to the display panel by both the adhesive material and the cured resin. In this way, by using the adhesive material and the resin together as the adhesive layer, the adhesive force of the adhesive layer can be strengthened, and the occurrence of displacement between the display panel and the function addition member can be suppressed.

In another aspect of the electro-optical device, the resin is arranged in a dot shape on the surface of the display panel or the function adding member. As a result, it is not necessary to use an amount of resin that causes bubbles or leaks.

In another aspect of the electro-optical device, the resin is linearly arranged on the surface of the display panel or the function adding member. Thereby, the adhesive force of a contact bonding layer can be strengthened more and generation | occurrence | production of the position shift of a display panel and a function addition member can be suppressed more effectively.

In another aspect of the electro-optical device, the resin is disposed only in a region outside a display region for displaying an image. Thereby, display characteristics can be improved.

In another aspect of the electro-optical device, the resin is disposed on the outermost side of the adhesive layer. Thereby, an adhesive layer can be formed efficiently.

In another aspect of the electro-optical device, the resin is arranged in a frame shape surrounding the adhesive material on the surface of the display panel or the function adding member. Thereby, it is possible to suppress a decrease in the adhesive force of the pressure-sensitive adhesive material due to moisture absorption.

In a preferred embodiment of the electro-optical device, the resin is a photo-curing resin that is cured by being irradiated with light.

In another aspect of the present invention, an electronic apparatus including the above-described electro-optical device in a display portion can be configured.

In another aspect of the present invention, a method for manufacturing an electro-optical device includes: a display panel manufacturing process for manufacturing a display panel; and a tape-like adhesive material on one surface of the function addition member or the display panel. Adhesive material pasting step for pasting, function adding member adhering step for adhering the function adding member and the display panel, and between the function adding member and the display panel, more than the adhesive force of the adhesive material during curing A resin injection step of injecting a liquid resin having a strong adhesive force; and a resin curing step of curing the resin. Thereby, it is possible to suppress the occurrence of displacement between the display panel and the function addition member, and it is possible to efficiently form the adhesive layer.

In still another aspect of the present invention, a preferable method for manufacturing an electro-optical device includes a display panel manufacturing process for manufacturing a display panel, and a tape-like shape on the surface of either the function addition member or the display panel. Adhesive strength of the pressure-sensitive adhesive material at the time of curing, in the pressure-sensitive adhesive material-pasting step for pasting the pressure-sensitive adhesive material, and in the region where the pressure-sensitive adhesive material on the surface of either the function-added member or the display panel is not affixed A resin application step of applying a liquid resin having stronger adhesive force, a function addition member adhesion step of adhering the function addition member and the display panel, and a resin curing step of curing the resin.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the present invention is applied to a liquid crystal display device.

[Liquid Crystal Display]
FIG. 1 is a cross-sectional view of the liquid crystal display device 100. The liquid crystal display device 100 mainly includes the light source unit 1.
5 and a light guide plate 11 and a liquid crystal display panel 20. The liquid crystal display panel 20 is disposed to face the upper surface of the light guide plate 11. A reflection sheet 14 is disposed on the lower surface of the light guide plate 11. The light source unit 15 includes a plurality of LEDs 16 that are point light sources.

The light L emitted from each LED 16 enters the light guide plate 11, changes direction by repeating reflection on the upper and lower surfaces of the light guide plate 11, and exits from the upper surface to the outside. The emitted light L travels toward the liquid crystal display panel 20.

The liquid crystal display panel 20 has a display area substantially the same as the light emission area of the light guide plate 11. The liquid crystal display panel 20 is configured by bonding substrates 1 and 2 made of glass or the like through a sealing material 3 to form a cell structure and enclosing a liquid crystal 4 therein. The liquid crystal display panel 20 includes a substrate 1,
The polarizing plate 5 is provided on the outer surface of each of the two. Here, in the liquid crystal display panel 20, an area where an image on the display screen is displayed is indicated as a display area V.

For example, a diffusion sheet 12 and a prism sheet 13 are provided as optical sheets between the illumination device 10 and the liquid crystal display panel 20. The diffusion sheet 12 has a role of diffusing the light L emitted from the light guide plate 11 in all directions. The prism sheet 13 has a role of condensing the light L on the liquid crystal display panel 20 and has a shape in which a prism shape having a substantially triangular cross section is extended in one side direction (direction of a side perpendicular to the cross section). . The light L emitted from the light guide plate 11 passes through these optical sheets and then illuminates by passing through the liquid crystal display panel 20.

FIG. 2 is an enlarged cross-sectional view of a region 30 surrounded by a wavy line of the liquid crystal display device 100 shown in FIG. FIG. 3 is a plan view of the liquid crystal display device 100. The liquid crystal display device 100 shown in FIG.
FIG. 4 is a cross-sectional view taken along a cutting line AA ′ in the plan view of the liquid crystal display device 100 shown in FIG. 3. As shown in FIG. 2, an adhesive layer 6 is provided between the polarizing plate 5 and the substrate 2. The polarizing plate 5 is bonded to the substrate 2 by the adhesive layer 6.

As shown in FIGS. 2 and 3, the adhesive layer 6 is composed of a tape-like adhesive material 7 and a cured resin 8. As the tape-like adhesive material 7, for example, an acrylic adhesive material is used. As the resin 8, for example, a photo-curable resin that is cured from a liquid state when irradiated with light such as visible light or ultraviolet light and has an adhesive strength stronger than the adhesive strength of the pressure-sensitive adhesive material 7 at the time of curing is used. .
That is, the substrate 2 and the polarizing plate 5 are bonded together by both the tape-shaped adhesive material 7 and the cured resin 8. Thus, in the liquid crystal display device 100 according to the present embodiment, the resin 8 is used in combination as compared with the case where only the tape-like adhesive material is used as the adhesive layer, and thus the adhesive force of the adhesive layer 6 is enhanced. It is possible to suppress the occurrence of displacement between the substrate 2 and the polarizing plate 5.

In the liquid crystal display device 100 according to the present embodiment, in the adhesive layer 6, the resin 8 is arranged in the form of dots on the surface of the substrate 2 or the polarizing plate 5, and the tape-shaped adhesive material 7 is the substrate 2 or the polarizing plate 5. It is arranged so as to cover a place other than the place where the resin 8 is placed on the surface. Since the resin 8 is arranged in the form of dots on the surface of the substrate 2 or the polarizing plate 5, it is not necessary to use an amount of the resin 8 that causes bubbles or leakage.

The resin 8 is not limited to a photo-curing resin. Instead, a resin that is cured by applying heat or a resin that is cured by applying moisture may be used.

Further, in the liquid crystal display device 100 according to the present embodiment, the resin 8 is disposed only in a region outside the display region V. This is because when the resin 8 is disposed in the display region V, the light L may cause the shape of the resin 8 to appear on the display screen. That means
In the liquid crystal display device 100 according to the present embodiment, the resin 8 is disposed only in the region outside the display region V and is not disposed in the region in the display region V, so that display characteristics can be improved. .

Furthermore, in the liquid crystal display device 100 according to the present embodiment, the resin 8 is disposed on the outermost side of the adhesive layer 6. In this case, the resin 8 is exposed from the side surface of the adhesive layer 6. As will be described in detail later, in the manufacturing method of the liquid crystal display device 100 in this case, the manufacturer injects the resin 8 from between the substrate 2 and the polarizing plate 5 even after bonding the substrate 2 and the polarizing plate 5 with the adhesive material 7. can do. As will be described in detail later, since the resin 8 is exposed from the side surface of the adhesive layer 6, the manufacturer directly applies light for curing to the resin 8 of the adhesive layer 6 from the side surface of the adhesive layer 6. Irradiation is possible, and the adhesive layer 6 can be formed efficiently.

(Manufacturing method of liquid crystal display device)
Next, a method for manufacturing the liquid crystal display device 100 according to the present embodiment will be described with reference to the flowchart shown in FIG. FIG. 4 is a flowchart showing a method for manufacturing the liquid crystal display device 100 according to the present embodiment. FIG. 5 is a schematic diagram of each manufacturing process in the method for manufacturing the liquid crystal display device 100 according to the present embodiment.

First, as a display panel manufacturing process, after the two substrates 1 and 2 are bonded together, liquid crystal is sealed between the two bonded substrates 1 and 2 to manufacture the liquid crystal display panel 20 (
Step P11).

Next, as shown in FIG. 5A, for example, the adhesive material 7 from which the four corners are cut off is the surface of either the substrate 2 or the polarizing plate 5 of the liquid crystal display panel 20, as shown in FIG. After being stuck on (process P12), the substrate 2 of the liquid crystal display panel 20 and the polarizing plate 5 are bonded together as a function addition member adhesion process (process P13).

Next, as a resin injecting step, as shown in FIG. 5B, a region where the adhesive material 7 is not applied on the surface of either the substrate 2 or the polarizing plate 5, that is, the adhesive material 7 is cut off. The liquid resin 8 is injected from between the substrate 2 and the polarizing plate 5 into the four-corner region (step P14). And as a resin hardening process, as shown in FIG. 6, the exposed part 1 of the resin 8 in the side surface of the contact bonding layer 6 is shown.
7 is irradiated with light for curing, and the resin 8 is cured (process P15). By doing so, the adhesive layer 6 is formed. In FIGS. 5 and 6, the liquid crystal display panel 2 is shown for explanation.
Only the zero substrate 2 is shown. Similarly, the substrate 1 and the polarizing plate 5 of the liquid crystal display panel 20 are as follows.
After the bonding, the liquid crystal display device 100 is completed by attaching other accessory parts such as the lighting device 10 (process P16).

In the method for manufacturing the liquid crystal display device 100 according to the present embodiment, the substrate 2 and the polarizing plate 5 are bonded together by both the tape-like adhesive material 7 and the cured resin 8. By doing in this way, the adhesive force of the contact bonding layer 6 can be strengthened, and it can suppress that position shift generate | occur | produces in the board | substrate 2 and the polarizing plate 5. FIG. Further, in the method for manufacturing the liquid crystal display device 100 according to the present embodiment, the resin 8 is disposed on the outermost side of the adhesive layer 6 and exposed from the side surface, so that the manufacturer directly applies light for curing. The resin 8 can be irradiated from the side surface. Thereby, the resin 8 can be obtained in a short time.
Therefore, the adhesive layer 6 can be efficiently formed.

In addition, in the manufacturing method of the liquid crystal display device 100 according to the present embodiment, the resin 8 is injected after the substrate 2 and the polarizing plate 5 are bonded together by the adhesive material 7, but is not limited thereto. Instead, after the display panel manufacturing process, as the adhesive material application process, the adhesive material is applied on either the surface of the substrate 2 or the polarizing plate 5 of the liquid crystal display panel 20, and then the resin application process As described above, the resin 8 is also applied to an area where the adhesive material on the surface of either the substrate 2 or the polarizing plate 5 has not been applied, and then the substrate 2 of the liquid crystal display panel 20 as a function adding member bonding step. The polarizing plate 5 may be bonded together, and the resin 8 may be cured as a resin curing step.

[Modification]
Next, a modification of the liquid crystal display device 100 according to the present embodiment will be described. FIG. 7 is a plan view of a liquid crystal display device 100 according to a modification.

In the liquid crystal display device 100 according to the modified example, unlike the above-described embodiment, instead of the resin 8 being arranged in the form of dots on the surface of the substrate 2 or the polarizing plate 5, as shown in FIG. , Substrate 2
Alternatively, they are arranged linearly on the surface of the polarizing plate 5. By doing in this way, since the area | region which the resin 8 occupies increases compared with the above-mentioned embodiment, the adhesive force of the contact bonding layer 6 can be strengthened more, and position shift generate | occur | produces in the board | substrate 2 and the polarizing plate 5. Can be suppressed more effectively. Also,
When the resin 8 is arranged in a frame shape surrounding the adhesive material 7, the resin 8 is composed of the substrate 2 and the polarizing plate 5.
It is also possible to prevent moisture from entering during this period, and it is possible to suppress a decrease in the adhesive strength of the pressure-sensitive adhesive material 7 due to absorption of moisture.

As a manufacturing method of the liquid crystal display device 100 according to the modification, the adhesive material 7 is applied to either the substrate 2 or the polarizing plate 5 of the liquid crystal display panel 20, and the resin 8 is either the substrate 2 or the polarizing plate 5. Let us consider a case in which a method in which the substrate 2 of the liquid crystal display panel 20 and the polarizing plate 5 are bonded together is applied. At this time, for example, if the manufacturer arranges the plurality of polarizing plates 5 in an aligned manner and then applies the resin 8 to the plurality of arranged polarizing plates 5 in a linear manner, The resin 8 can be applied linearly on the surface. That is, since the manufacturer can apply the resin 8 more efficiently when applied in a line form than in a dot form, the manufacturing method of the liquid crystal display device 100 according to the modification example includes a manufacturing process. Can be made more efficient.

In the above-described embodiment, the resin 8 is disposed only in the region outside the display region V. However, the present invention is not limited to this, and instead of or in addition, the resin 8 is disposed in the region inside the display region V. Needless to say, it may be arranged. In the above-described embodiment, the resin 8 is
Although the outermost layer of the adhesive layer 6 is arranged, the present invention is not limited to this, and it is needless to say that the adhesive layer 6 may be arranged at a place other than the outermost place of the adhesive layer 6 instead. Yes. In such a case, as a manufacturing method, a resin 8 is formed between the substrate 2 and the polarizing plate 5.
Therefore, the adhesive material 7 is applied to either the substrate 2 or the polarizing plate 5 of the liquid crystal display panel 20, and the resin 8 is also applied to either the substrate 2 or the polarizing plate 5. After that, the substrate 2 and the polarizing plate 5 of the liquid crystal display panel 20 are bonded together. Then, the light for curing is irradiated on the resin 8 indirectly from above the liquid crystal display device 100 through the polarizing plate 5.

In the above-described embodiment and modification, the resin 8 is arranged in a dot shape or a line shape. However, it is needless to say that the resin 8 can be arranged in various shapes.
In addition, spacers of the same size may be mixed in the resin 8. By doing so, the thickness of the adhesive layer 6 can be made uniform, and the occurrence of gap defects can be prevented.

In the above-described embodiment, the case where the liquid crystal display panel and the polarizing plate are bonded is described. However, the scope to which the present invention can be applied is not limited to this, and a function addition member other than the polarizing plate, for example, three-dimensional display is performed. Needless to say, the present invention can also be applied to a case where a parallax barrier or a touch panel substrate of a touch panel is bonded to a liquid crystal display panel. Furthermore, it goes without saying that the present invention can be applied not only to a liquid crystal display panel but also to a case where a function addition member is bonded to another display panel such as a plasma display panel instead.

[Electronics]
Next, specific examples of electronic devices to which the liquid crystal display device 100 according to the present invention can be applied will be described with reference to FIG.

First, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 8A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display panel according to the present invention is applied.

Next, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 8B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the mobile phone 720 includes a plurality of operation buttons 721, an earpiece 722, a mouthpiece 723.
In addition, a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied is provided.

Electronic devices to which the liquid crystal display device 100 according to the present invention can be applied include a liquid crystal television, in addition to the personal computer shown in FIG. 8A and the mobile phone shown in FIG.
Viewfinder type / monitor direct view type video tape recorder, car navigation system,
Pager, electronic notebook, calculator, word processor, workstation, videophone, PO
S terminal, a digital still camera, etc. are mentioned.

It is sectional drawing of the liquid crystal display device which concerns on this embodiment. It is an expanded sectional view of the liquid crystal display device concerning this embodiment. It is a top view of the liquid crystal display device concerning this embodiment. It is a flowchart which shows the manufacturing method of a liquid crystal display device. It is a schematic diagram which shows each manufacturing process of the manufacturing method of a liquid crystal display device. It is a schematic diagram which shows each manufacturing process of the manufacturing method of a liquid crystal display device. It is a top view of the liquid crystal display device which concerns on a modification. It is a figure which shows the example of the electronic device to which the liquid crystal display device of this invention is applied.

Explanation of symbols

1, 2 substrate, 5 polarizing plate, 6 adhesive layer, 7 adhesive material, 8 resin, 10 illumination device, 20 liquid crystal display panel, 100 liquid crystal display device

Claims (10)

A display panel;
An adhesive layer provided on the outer surface of the display panel, and composed of a tape-like adhesive material, and a resin having an adhesive force stronger than that of the adhesive material when cured;
A function adding member bonded to the display panel by the adhesive layer,
The electro-optical device, wherein the function adding member is bonded to the display panel by both the adhesive material and the cured resin. The electro-optical device according to claim 1, wherein the resin is arranged in a dot shape on a surface of the display panel or the function adding member. The electro-optical device according to claim 1, wherein the resin is linearly arranged on a surface of the display panel or the function adding member. The electro-optical device according to claim 1, wherein the resin is disposed only in a region outside a display region that displays an image. The resin is disposed on the outermost side of the adhesive layer.
The electro-optical device according to any one of the above. 6. The electro-optic according to claim 3, wherein the resin is disposed in a frame shape surrounding the adhesive material on the surface of the display panel or the function adding member. apparatus. The electro-optical device according to claim 1, wherein the resin is a photo-curable resin that is cured by being irradiated with light. An electronic apparatus comprising the electro-optical device according to claim 1 in a display unit. A display panel manufacturing process for manufacturing a display panel;
On the surface of either one of the function addition member or the display panel, an adhesive material application step of applying a tape-like adhesive material;
A function addition member bonding step for bonding the function addition member and the display panel;
Between the function addition member and the display panel, a resin injection step of injecting a liquid resin having an adhesive force stronger than the adhesive force of the adhesive material at the time of curing;
And a resin curing step for curing the resin. A display panel manufacturing process for manufacturing a display panel;
On the surface of either one of the function addition member or the display panel, an adhesive material application step of applying a tape-like adhesive material;
Resin for applying a liquid resin having an adhesive strength stronger than that of the adhesive material at the time of curing to a region where the adhesive material on the surface of either the function addition member or the display panel is not attached Application process;
A function addition member bonding step for bonding the function addition member and the display panel;
And a resin curing step for curing the resin.

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