JP6071212B2 - Manufacturing method of display device - Google Patents

Manufacturing method of display device Download PDF

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JP6071212B2
JP6071212B2 JP2012036610A JP2012036610A JP6071212B2 JP 6071212 B2 JP6071212 B2 JP 6071212B2 JP 2012036610 A JP2012036610 A JP 2012036610A JP 2012036610 A JP2012036610 A JP 2012036610A JP 6071212 B2 JP6071212 B2 JP 6071212B2
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resin
display
transparent
sheet
display panel
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JP2013171250A (en
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寺井 護
護 寺井
遠藤 康博
康博 遠藤
中川 直紀
直紀 中川
寺本 賢司
賢司 寺本
光男 山下
光男 山下
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三菱電機株式会社
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Description

  The present invention relates to a display device in which a light shielding portion is provided at a step portion of a transparent protective plate, and a manufacturing method thereof.

In many cases, the display surface of the display panel is covered with a transparent protective plate because of the necessity of protecting the display panel from external impacts or inundation due to rain or the need to improve the design.
Examples of the display device include a liquid crystal display device and an organic electroluminescence display device.

  When a transparent protective plate is arranged on the display surface of the display panel, if there is an air layer in the gap between the display panel and the transparent protective plate, the external light incident on the display surface is reflected on the front and back surfaces of the transparent protective plate, the display panel In order to suppress this reduction, a method of improving the visibility by placing a transparent resin in the gap between the display panel and the transparent protective plate is used.

Further, as the transparent protective plate, for example, a resinous transparent resin plate is used for reducing the weight of the display device or reducing the degree of damage to the human body when the transparent protective plate is broken.
In this case, when used in an environment at a relatively high temperature (60 to 80 ° C.), bubbles are generated at the interface between the transparent resin plate and the transparent resin due to the outgas generated from the transparent resin plate, thereby increasing the appearance. There was a problem to lose.
This is because resin materials such as polycarbonate and acrylic resin generally have high hygroscopicity and high water vapor permeability. The reason why bubbles are generated is thought to be because the moisture that volatilizes when the hygroscopic synthetic resin plate is heated deforms the soft transparent resin.
Here, the outgas is a gas released from the transparent resin plate when moisture absorbed in the transparent resin plate during storage or use in a general environment is used at a high temperature.

  And as a manufacturing method of the display device in which the transparent resin plate is bonded to the display panel through the transparent resin, the transparent resin plate and the display panel are formed by light irradiation with a photocurable transparent adhesive. There has been proposed a structure that has a structure bonded with a transparent resin that has been formed and suppresses the generation of bubbles (Patent Document 1).

Japanese Patent Laid-Open No. 10-83247

However, in the above display device, in the case of a structure in which the transparent resin plate and the display panel are bonded to each other through light irradiation through a photocurable transparent adhesive, the light shielding portion (formed on the peripheral portion of the back surface of the transparent resin plate). There is a problem that the photo-curing transparent adhesive remains uncured because the light that is sufficiently irradiated does not reach in the step portion, particularly for improving the design.
In addition, the display panel is deformed by the curing shrinkage of the photo-curable transparent adhesive, and there is a problem in that the display quality is adversely affected.
In addition, a display device in which bubbles are generated at the interface and inside of the transparent protective plate and the photocurable transparent adhesive becomes a defective product, and when the defective product is regenerated, the display panel and the transparent protective plate are peeled off to remove the transparent adhesive. In particular, since the display panel is composed of a composite member, there is a problem that a very complicated operation is required to regenerate the display panel.

  An object of the present invention is to solve such problems, and provides a display device using a transparent protective plate having a light-shielding portion, which suppresses deterioration in display quality, and a method for manufacturing the same. The purpose is to do.

Method for manufacturing a display device according to this invention includes a display panel, provided facing the display panel, a transparent protective plate body, and projects the display panel side surface of the display panel side of the protective plate body A transparent protective plate having a light shielding portion which is a stepped portion provided, and a transparent resin body provided between the transparent protective plate and the display panel,
The transparent resin body is bonded to the transparent protective plate and is formed by curing a photocurable liquid resin by light irradiation, and an adhesive bonded to the photocurable resin portion and the display panel, respectively. Manufacturing method of a display device composed of a sheet-shaped resin part having
An application step of applying the photocurable liquid resin to the transparent protective plate;
A resin part laminating step for laminating the sheet-like resin part to the photocurable liquid resin;
A curing step of irradiating the photocurable liquid resin with light from the sheet-like resin portion side to form the photocurable resin portion;
A panel laminating step for laminating the display panel to the sheet-like resin part,
In the curing step, the sheet-like resin portion is disposed below the photocurable liquid resin.

According to the method for manufacturing a display device according to this invention, by curing the photocurable liquid resin after forming a photocurable resin portion, since bonding the display panel sheet-shaped resin portion, the photocurable liquid resin Display unevenness due to curing shrinkage does not occur.
Further, since the light curable liquid resin is formed by irradiating the light curable liquid resin from the sheet-shaped resin portion side, the light reaches the light curable liquid resin without being blocked by the light shielding portion, and the light curable liquid resin is It remains uncured.
In addition, even if a defective product is generated due to bubbles or waviness of the transparent resin body due to thickness fluctuations at the interface and inside of the transparent protective plate and the transparent resin body due to some factor, the defective product is excluded before bonding the display panel. Therefore, since the object of reproduction can be limited only to the transparent protective plate, the repair property is high, and the yield can be improved.

It is a top view which shows the display apparatus of Embodiment 1 of this invention. It is arrow sectional drawing along the II-II line | wire of FIG. FIG. 3A to FIG. 3D are explanatory views showing each step of the manufacturing method of the display device of FIG.

Embodiment 1 FIG.
1 is a plan view of a display device according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.
The display device includes a display panel 1, a transparent resin body 2 disposed on the surface of the display panel 1, and a transparent protective plate 3 disposed on the surface of the transparent resin body 2.

  As the display panel 1, a liquid crystal display panel, an organic electroluminescence panel, or the like is used. As a driving method of these display panels 1, there are a passive driving method and an active driving method.

The rectangular transparent protective plate 3 includes a transparent protective plate main body 4 having a step portion 5 formed on the entire back surface thereof and a light shielding portion 6 provided on the step portion 5. The light-shielding portion 6 is provided in order to improve the design property, and is mainly formed by screen printing.
The protection plate body 4 is a transparent plate that hardly absorbs in the visible region, and specifically, is a transparent resin plate such as an acrylic resin, a polycarbonate resin, or a cycloolefin resin.
Further, the protective plate body 4 may be a glass plate tempered using an ion exchange method, an air cooling tempering method, or the like, or a laminated glass.
Furthermore, the protective plate main body 4 can be appropriately subjected to anti-glare treatment, anti-reflection treatment for improving visibility, and hard coat treatment for preventing scratches on the protective plate main body 4. The protective plate main body 4 is arranged so as to cover at least a larger area than the display portion which is a display area of the display panel 1 and further to cover a larger range than the transparent resin body 2.

The light-shielding portion 6 is made of a material that almost shields wavelengths in the visible region. For example, an acrylic resin blended with carbon black is used.
The light shielding portion 6 can be formed in accordance with the display area of the display panel 1, but from the viewpoint of design, the light shielding portion 6 has a size in which the clearance between the element that displays the image on the display panel 1 and the light shielding portion 6 is minimized. preferable.
The light-shielding part 6 should just satisfy | fill desired performance, and the formation method is not specifically limited, For example, it can form by apply | coating resin using a screen printing method.
The coating thickness of the light-shielding portion 6 (corresponding to the step height of the step portion 5) varies depending on the intensity of the light source to be shielded, but about 3 to 50 μm is used. When the color of the light-shielding part 6 is white, the coating film thickness of the light-shielding part 6 is large and is about 10 to 50 μm, and when it is black, about 3 to 40 μm is preferable.

In the transparent resin body 2, when an air layer is interposed in the gap between the display panel 1 and the transparent protective plate 3, external light incident on the surface of the display panel 1 is reflected on the front and back surfaces of the protective plate body 4, the display panel. It suppresses that visibility falls by reflecting on the surface of 1. FIG.
The transparent resin body 2 has a photo-curing resin portion 7 adhered to the transparent protective plate 3 having the light-shielding portion 6 and a sheet-like resin portion 8 having both surfaces adhered to the photo-curing resin portion 7 and the display panel 1 respectively. doing.

The photo-curing resin portion 7 is obtained by irradiating light to a transparent photo-curing liquid resin that hardly absorbs in the visible region.
Specific examples of the photocurable liquid resin include polyester acrylate resins, epoxy acrylate resins, urethane acrylate resins, silicone resins, and the like, but are not limited to these resins, and are transparent. Any photo-curable resin may be used.
The light for curing the photocurable liquid resin to form the photocurable resin portion 7 may be ultraviolet light or visible light, and can be arbitrarily used depending on the characteristics of the photocurable liquid resin used.
Moreover, if it is a range which does not impair the quality of the display panel 1, heat curing can also be used together.
The refractive index of the photocurable resin portion 7 after curing the photocurable liquid resin is desirably 1.47 to 1.57.
If the photocurable liquid resin having this refractive index is used, the refractive index of the glass plate or resin plate used for the photocurable resin portion 7 and the protective plate body 4 is substantially equal. 4 is optically integrated and visibility is improved.

  The sheet-like resin portion 8 has a size larger than the display area of the display panel 1. As the sheet-like resin portion 8, for example, an acrylic resin, a silicone resin, or the like can be used, but is not limited thereto, and any transparent resin having adhesiveness may be used.

Next, a manufacturing method of the display device having the above configuration will be described with reference to FIGS.
First, the photocurable liquid resin 7A is applied to the surface of the protective plate main body 4 on the side having the light-shielding portion 6 by using a dispenser 9 (FIG. 3 (a) application step). The application amount of the photocurable liquid resin 7A may be applied to a desired area.
This coating method may be a method of coating by screen printing instead of the dispenser 9.

Next, the sheet-like resin portion 8 is bonded to the photocurable liquid resin 7A (resin portion bonding step).
As the sheet-like resin portion 8, a sheet-like resin body in which separators are bonded to both surfaces thereof is used. Before being bonded to the photocurable liquid resin 7A, the separator on one side of the sheet-like resin body is peeled off, and the exposed sheet-like resin portion 8 is bonded to the photocurable liquid resin 7A.
This sheet-like resin body is formed by, for example, developing a sheet-like resin portion 8 in which a sticky adhesive resin is made into a solution with a solvent or the like as necessary, on a separator, and further arranging a separator on the development layer to form a sheet. It is formed.
The separator can be obtained by a method of surface-treating a thin leaf body such as a film with a release agent.

Thereafter, the transparent support plate 10 is brought into surface contact with a separator (not shown) attached to one side of the sheet-like resin portion 8, and then light is irradiated from the light source 11 toward the sheet-like resin portion 8, thereby photocuring type. The liquid resin 7A is photocured to form the photocured resin portion 7 (FIG. 3 (b), FIG. 3 (c) curing step).
When the transparent support plate 10 is brought into surface contact, the photocurable liquid resin 7A is thinly developed to the entire surface of the sheet-like resin portion 8 and the step portion of the light shielding portion 6 formed on the step portion 5 of the transparent protective plate 3. .
The bonding surface of the sheet-shaped resin portion 8 on the display panel 1 side is desirably in a state where flatness is maintained. For this purpose, as shown in FIG. 3B, the sheet-shaped resin portion 8 is transparent. A method of irradiating light from the lower side in a state where the protective plate 3 and the photocurable liquid resin 7A are disposed below and supported by the transparent support plate 10 is suitable.
The light in this case reaches the photocurable liquid resin 7A through the transparent support plate 10, the separator, and the sheet-like resin portion 8 that transmit the desired light, and the photocurable liquid resin 7A enters the cured photocurable resin portion 7. Metamorphosis.

In addition, when the sheet-like resin part 8 is bonded to the photocurable liquid resin 7A and then irradiated with light with the sheet-like resin part 8 facing upward, the sheet-like resin part 8 is uncured light. Since it is supported by the curable liquid resin 7A, the center of the sheet-like resin portion 8 is dented due to the weight of the sheet-like resin portion 8, and the bonding surface of the sheet-like resin portion 8 to the display panel 1 is reduced. Flatness may be lost.
As a result, when the display panel 1 is bonded to the sheet-like resin portion 8, there may be a problem that bubbles are generated in the central portion.

When a transparent resin plate is used as the transparent protective plate 3, the elastic modulus of the photocurable resin portion 7 is 30 kPa or higher, and a higher elastic modulus than that of the sheet-like resin portion 8 is used.
Thus, when the display device according to the present invention is used in an environment at a high temperature of 70 ° C. or higher, the interface between the transparent resin plate and the sheet-like resin portion 8 (photo-curing resin portion) is caused by outgas generated from the transparent resin plate. Bubbles generated in 7) can be suppressed.
The elastic modulus of the sheet-like resin part 8 and the cured photo-curing resin part 7 is obtained by sandwiching a test piece between parallel disks having a diameter of 8 mm using a dynamic viscoelasticity tester and storing the elastic modulus at a frequency of 1 Hz ( The value of G ′) at 70 ° C. is shown.
As the test piece, a single piece or a laminate having a thickness of 0.5 to 2.5 mm is used.
Finally, except for the transparent support plate 10 (FIG. 3C), the separator attached to the surface of the sheet-shaped resin portion 8 is peeled off, and the display panel 1 is bonded to the surface of the sheet-shaped resin portion 8 (FIG. 3 ( d) Panel bonding step).

  Hereinafter, examples and comparative examples of the display device of the above embodiment will be described, but the same or equivalent members as those of the embodiment will be described with the same reference numerals.

Example 1.
An ultraviolet curable resin liquid that is a photocurable liquid resin 7A is dropped onto the light shielding portion 6 side of the transparent glass plate that is the transparent protective plate 3.
Thereafter, the adhesive sheet-like resin portion 8 is bonded so that bubbles are not generated in the ultraviolet curable resin liquid, and the ultraviolet curable resin liquid is applied to the transparent glass plate having the sheet-like resin portion 8 and the light shielding portion 6. A thin layer is developed on each surface.
Next, a UV curable resin liquid is cured by irradiating with an ultraviolet ray using a high-pressure mercury lamp as the light source 11, and the UV curable resin liquid is cured on the transparent glass plate having the light shielding part 6. Thus, a transparent resin body 2 constituted by laminating the ultraviolet curable resin portion 7 and the sheet-like resin portion 8 was obtained.

  Next, the glass plate having the light-shielding portion 6 and the display panel 1 are removed from the transparent resin body 2 by removing the separator attached to one side of the sheet-like resin portion 8 and attaching the separator to the one side. A display device having a transparent resin body 2 in which an ultraviolet curable resin portion and a sheet-like resin portion 8 are laminated is obtained.

Example 2
In this embodiment, instead of the transparent glass plate which is the transparent protective plate 3 of the first embodiment, a transparent resin plate which is the transparent protective plate 3 in which polycarbonate and polymethyl methacrylate subjected to anti-reflection treatment and anti-glare treatment are laminated. Was used.
Other configurations and manufacturing methods are the same as those in the first embodiment.

  Table 1 is a table showing bubbles and display unevenness generated in the display devices of Example 1 and Comparative Examples 1 to 3.

Comparative Example 1
In the display device of Comparative Example 1, instead of the transparent resin body 2 of Example 1, only the sheet-like resin portion 8 was used.
Others are the same as the display apparatus of Example 1 using transparent glass as the transparent protective plate 3.

Comparative Example 2
In the display device of Comparative Example 2, instead of the transparent resin body 2 of Example 2, only the sheet-like resin portion 8 was used. That is, the ultraviolet curable resin portion which is the photocurable resin portion 7 is excluded.
Others are the same as the display apparatus of Example 2 using a transparent resin plate as the transparent protective plate 3.

Comparative Example 3
In the display device of Comparative Example 3, instead of the transparent resin body 2 of Example 2, only the ultraviolet curable resin portion that is the photocurable resin portion 7 was configured. That is, the sheet-like resin portion 8 is removed.
Others are the same as the display apparatus of Example 2 using a transparent resin plate as the transparent protective plate 3.
In addition, in the case of this comparative example 3, when irradiating ultraviolet rays, when an ultraviolet curable resin liquid is arrange | positioned under the transparent resin board which is the transparent protective plate 3, an ultraviolet curable resin liquid will be dripped. Since such an arrangement is not possible, the transparent resin plate and the display panel 1 are bonded together via an ultraviolet curable resin solution, and then irradiated with ultraviolet rays to form an ultraviolet curable resin portion.

  Even when the display device of Example 1 is used in a high-temperature environment of 70 ° C. or higher, the reflection loss of light at the interface between the transparent glass plate, which is the transparent protective plate 3, and the display panel 1 is greatly reduced. The display quality did not deteriorate significantly (display unevenness) due to curing shrinkage of the UV curable resin liquid, and the UV curable resin portion did not remain uncured and had a stable display quality.

On the other hand, generation of bubbles was observed in the display device of Comparative Example 1. A large number of bubbles were observed particularly in the step portion 5 of the transparent glass plate which is the transparent protective plate 3.
It is considered that this is because the adhesive sheet-like resin portion 8 cannot follow the change in the shape of the step portion 5 of the transparent glass plate and a gap is generated in the step portion 5.

In the display device of Comparative Example 2, a large number of bubbles were observed. Bubbles were seen in the display portion which is the display area of the display panel 1 and the step portion 5 of the transparent resin plate which is the transparent protective plate 3.
It is considered that bubbles in the display area are generated at the interface between the adhesive sheet-like resin portion 8 and the transparent resin plate due to outgas generated from the transparent resin plate.
It is considered that the bubbles in the step portion 5 are caused by the fact that the adhesive sheet-like resin portion 8 cannot follow the change in the shape of the step portion 5 of the transparent resin plate and a gap is generated in the step portion 5.

In the display device of Comparative Example 3, there was no occurrence of bubbles, but the occurrence of display unevenness was observed.
This is considered to be because normal display quality cannot be obtained because the gap inside the display panel 1 changes mainly due to curing shrinkage of the ultraviolet curable resin liquid.
Moreover, in this comparative example, the ultraviolet curable resin part directly under the light shielding part 6 of the transparent resin plate is left uncured. An uncured ultraviolet curable resin liquid is not preferable because it induces contamination of peripheral parts due to liquid dripping during the long-term use, functional failure due to short-circuiting of electronic parts, unpleasant odor when used at high temperatures, and the like.

  Table 2 shows the display device of Example 2 using a transparent resin plate as the transparent protective plate 3, and manufactured the display device by changing the respective elastic modulus and film thickness of the ultraviolet curable resin portion and the sheet-like resin portion 8. It is a table | surface which shows the bubble which arose in the display apparatus at the time, and display nonuniformity.

In Example 2, the results differed depending on the elastic modulus and film thickness of the ultraviolet curable resin part and the sheet-like resin part used. The elastic modulus and film thickness of the sheet-like resin were fixed to 60 kPa and 175 μm, respectively, and the film thickness of the ultraviolet curable resin portion was fixed to 15 μm, and the display modulus was examined by changing the elastic modulus of the ultraviolet curable resin portion (Example 2-1). ~ 2-4).
Even if a display device having an elastic modulus of the ultraviolet curable resin portion of 60 kPa or higher is used in a high-temperature environment of 70 ° C. or higher, the reflection loss of light at the interface between the transparent resin plate that is the transparent protective plate 3 and the display panel 1 is reduced. The display quality was greatly reduced, the display quality was not significantly lowered (display unevenness) due to bubbles and curing shrinkage, and the UV curable resin portion was not left uncured and had a stable display quality.
When the elastic modulus of the ultraviolet curable resin part was less than 60 kPa, bubbles were generated. Bubbles were seen on the display. It is considered that the bubbles in the display portion are generated at the interface between the ultraviolet curable resin portion and the transparent resin plate due to the deformation of the ultraviolet curable resin portion due to the outgas generated from the transparent resin plate.

Next, the elastic modulus and film thickness of the ultraviolet curable resin part were fixed to 60 kPa and 15 μm, respectively, the film thickness of the sheet-like resin part 8 was fixed to 175 μm, and the display quality was examined by changing the film thickness of the sheet-like resin part 8. (Examples 2-3, 2-5, 2-6).
A display device having an elastic modulus of the sheet-like resin portion 8 of less than 100 kPa greatly reduces the reflection loss of light at the interface between the transparent resin plate and the display panel 1 even when used in a high temperature environment of 70 ° C. or higher. There was no noticeable deterioration (display unevenness) in display quality due to bubbles or cure shrinkage.
In addition, the UV curable resin part did not remain uncured and had a stable display quality.
On the other hand, display unevenness occurred in the display device in which the elastic modulus of the sheet-like resin portion 8 was 100 kPa or more.
This is presumably because the adhesive sheet-like resin portion 8 deformed at the step portion 5 also affects the display portion. Moreover, the influence by the thermal expansion of the sheet-like resin part 8 is also considered.

Next, the elastic modulus and film thickness of the ultraviolet curable resin part were fixed to 100 kPa and 15 μm, respectively, and the elastic modulus of the sheet-like resin part 8 was fixed to 60 kPa, and the display quality was examined by changing the film thickness of the sheet-like resin part 8. (Examples 2-4, 2-7, 2-8).
A display device having a film thickness of the sheet-shaped resin portion 8 exceeding 125 μm greatly reduces the reflection loss of light at the interface between the transparent resin plate and the display panel 1 even when used in a high temperature environment of 70 ° C. or higher. There was no noticeable deterioration (display unevenness) in display quality due to bubbles or cure shrinkage.
In addition, the UV curable resin part did not remain uncured and had a stable display quality.
On the other hand, display unevenness occurred in the display device in which the film thickness of the sheet-like resin portion 8 was 100 μm or less.
This is presumably because the sheet-like resin portion 8 deformed at the step portion 5 due to the curing shrinkage of the ultraviolet curable resin liquid also affects the display portion. Moreover, the influence by the thermal expansion of the sheet-like resin part 8 is also considered.

Next, the elastic modulus and film thickness of the sheet-like resin part 8 were fixed at 30 kPa and 175 μm, respectively, and the elastic modulus of the ultraviolet curable resin part was fixed at 40 kPa, and the display quality was examined by changing the film thickness of the sheet-like resin part 8. (Examples 2-9, 2-10).
A display device having a UV curable resin portion thickness of 5 μm or less greatly reduces the reflection loss of light at the interface between the transparent resin plate and the display panel 1 even when used in a high temperature environment of 70 ° C. or higher. In addition, the display quality was not significantly reduced (display unevenness) due to curing shrinkage.
Further, the UV curable resin liquid did not remain uncured and had a stable display quality.
On the other hand, bubbles were generated in the display device in which the film thickness of the ultraviolet curable resin portion was 15 μm or less.
It is considered that this is because bubbles are generated at the interface between the ultraviolet curable resin portion and the transparent resin plate due to the deformation of the ultraviolet curable resin portion due to the outgas generated from the transparent resin plate.

As described above, according to the display device of the present invention, the display panel 1 is provided so as to face the display panel 1 and is provided with the transparent protective plate main body 4. A transparent protective plate 3 having a light shielding portion 6 which is a stepped portion 5 provided so as to protrude from the transparent protective plate 3, and a transparent resin body 2 provided between the transparent protective plate 3 and the display panel 1. Is provided between the light curable resin portion 7 and the display panel 1 formed by curing the light curable liquid resin 7A provided on the transparent protective plate 3 by light irradiation . It is comprised from the adhesive sheet-like resin part 8. FIG.
Therefore, the vicinity of the light shielding portion 6 provided in the stepped portion 5 is filled with the photocurable liquid resin 7A without any gap, so that the generation of bubbles can be suppressed.

Moreover, since the transparent resin body 2 also uses the adhesive sheet-like resin portion 8 in combination with the photocurable resin portion 7, the photocurable liquid resin 7A before the photocurable resin portion 7 is cured in the manufacturing process occupies it. The volume ratio can be lowered, and when a transparent resin plate is used as the transparent protective plate 3, warping of the transparent resin plate accompanying cure shrinkage can be suppressed accordingly.
In particular, since the film thickness of the photo-curing resin portion 7 is thinner than the film thickness of the sheet-like resin portion 8, the effect of suppressing the warping of the transparent resin plate is great.
Moreover, the sheet-like resin part 8 has adhesiveness, and the adhesiveness of the display panel 1 and the sheet-like resin part 8 is ensured.

Moreover, when a transparent resin plate is used for the transparent protective plate 3, the elastic modulus of the photocurable resin portion 7 is higher than the elastic modulus of the sheet-like resin portion 8, and the photocurable resin portion 7 is not easily deformed by an external force.
Therefore, it is possible to suppress the generation of bubbles at the interface between the transparent resin plate and the photocurable resin portion 7 due to the deformation of the photocurable resin portion 7 due to the outgas generated from the transparent resin plate.
Further, since the elastic modulus of the sheet-like resin portion 8 is low, even when used in a high temperature environment, the influence of the sheet-like resin portion 8 deformed by the light shielding portion 6 on the display panel 1 is suppressed, and the transparent protective plate 3 and Light reflection loss between the display panel 1 and the display panel 1 can be reduced, and deterioration in display quality due to bubbles and curing shrinkage can be suppressed.

Further, according to the method for manufacturing a display device of the present invention, after the photocurable liquid resin is cured to form the photocurable resin portion 7, the display panel 1 is bonded to the sheet-like resin portion 8. Display unevenness due to curing shrinkage of the liquid resin does not occur.
In addition, since the light curable liquid resin 7A is formed by irradiating the light curable liquid resin 7A from the sheet-like resin part 8 side, the light reaches the light curable liquid resin 7A without being blocked by the light shielding part 6. The photocurable liquid resin 7A does not remain uncured.

  DESCRIPTION OF SYMBOLS 1 Display panel, 2 Transparent resin body, 3 Transparent protection board, 4 Protection board main body, 5 Level difference part, 6 Light-shielding part, 7 Photocurable resin part, 7A Photocurable liquid resin, 8 Sheet-like resin part, 9 Dispenser, 10 Transparent support plate, 11 light source.

Claims (5)

  1. A display panel;
    A transparent protective plate provided opposite to the display panel, and having a light shielding portion that is a stepped portion provided on the surface of the protective panel main body, the surface of the protective panel main body protruding toward the display panel,
    A transparent resin body provided between the transparent protective plate and the display panel,
    The transparent resin body is bonded to the transparent protective plate and is formed by curing a photocurable liquid resin by light irradiation, and an adhesive bonded to the photocurable resin portion and the display panel, respectively. Manufacturing method of a display device composed of a sheet-shaped resin part having
    An application step of applying the photocurable liquid resin to the transparent protective plate;
    A resin part laminating step for laminating the sheet-like resin part to the photocurable liquid resin;
    A curing step of irradiating the photocurable liquid resin with light from the sheet-like resin portion side to form the photocurable resin portion;
    A panel laminating step for laminating the display panel to the sheet-like resin part,
    In the curing step, the sheet-shaped resin portion is disposed below the photocurable liquid resin.
  2. The method for manufacturing a display device according to claim 1 , wherein the transparent protective plate is a transparent resin plate, and an elastic modulus of the photocurable resin portion is higher than an elastic modulus of the sheet-like resin portion.
  3. 3. The method for manufacturing a display device according to claim 1 , wherein the film thickness of the photocurable resin portion is smaller than the film thickness of the sheet-shaped resin portion.
  4. The method for manufacturing a display device according to claim 1 , wherein the photocurable liquid resin is an ultraviolet curable liquid resin.
  5. The method for manufacturing a display device according to claim 1 , wherein the light irradiation is ultraviolet irradiation.
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