HK1140302B - Image display device - Google Patents

Description

Image display device

Technical Field

The present invention relates to an image display device such as a Liquid Crystal Display (LCD) device used in, for example, a mobile phone, and more particularly, to an image display device in which a transparent protective portion is provided on an image display portion, and a method for manufacturing the same.

Background

Conventionally, as such a display device, for example, a liquid crystal display device 101 shown in fig. 6 is known. The liquid crystal display device 101 includes a transparent protective portion 103 made of, for example, glass or plastic on a liquid crystal display panel 102.

In this case, in order to protect the surface of the liquid crystal display panel 102 and a polarizing plate (not shown), a spacer 104 is inserted between the protective portion 103 and the liquid crystal display panel 102, thereby providing a gap 105 between the protective portion 103 and the liquid crystal display panel 102.

However, the presence of the gap 105 between the liquid crystal display panel 102 and the protective portion 103 causes light diffusion, which leads to a decrease in contrast and luminance, and the presence of the gap 105 hinders the thinning of the panel.

In view of such a problem, it has been proposed to fill a gap between the liquid crystal display panel and the protective portion with a resin (for example, patent document 1), but the stress generated during curing shrinkage of a cured resin causes deformation of an optical glass plate sandwiching the liquid crystal of the liquid crystal display panel, which causes display defects such as alignment disorder of a liquid crystal material.

Further, when the space between the liquid crystal display panel and the protective portion is filled with the resin composition, there is a problem that the resin composition (resin composition) adheres to the backlight side depending on the production conditions and the like.

Patent document 1: japanese patent application laid-open No. 2005-55641

Problems to be solved by the invention

The present invention has been made in view of the above-described problems of the conventional art, and an object of the present invention is to provide a thin image display device which can display an image with high luminance and high contrast without causing a display failure due to deformation of an image display portion, and which does not adhere an unnecessary resin to a backlight side.

Disclosure of Invention

Means for solving the problems

In order to solve the above problem, a method for manufacturing an image display device according to the present invention includes: a step of forming a resin cured layer by interposing a photocurable resin composition between a display side panel having an image display unit and a frame surrounding the image display unit and a protective unit so as to straddle the image display unit and the frame and photocuring the resin cured layer, the method for manufacturing an image display device being characterized in that,

as the photocurable resin composition, a resin composition having a viscosity (cone angle C35/2 ℃ cone and plate rotational viscometer, 10rpm, 25 ℃) of 3000 mPas to 12000 mPas was used.

Further, an image display device of the present invention includes: a display side panel having an image display unit and a housing surrounding the image display unit; a protection part arranged on the display side panel; and a resin cured layer interposed between the display side panel and the protective portion, the image display device being characterized in that,

a sealing film for closing a gap formed between the image display unit and the housing is disposed across the gap between the image display unit and the housing, and a resin cured layer is provided on the sealing film.

Further, the present invention provides a method of manufacturing an image display device, including: a step of forming a resin cured layer by interposing a photocurable resin composition between a display side panel having an image display unit and a frame surrounding the image display unit and a protective unit so as to straddle the image display unit and the frame and photocuring the resin cured layer, the method for manufacturing an image display device being characterized in that,

a gap formed between an image display unit and a frame body is closed by a sealing film, and a photocurable resin composition is disposed thereon.

Here, in the image display device and the method for manufacturing the image display device, it is preferable that the light transmittance of the resin cured layer as a visible light region is 90% or more, and the storage elastic modulus (storage elastic modulus) at 25 ℃ is 1.0 × 10⁷Pa or less, and a cure shrinkage of 5% or less.

ADVANTAGEOUS EFFECTS OF INVENTION

In general, in an image display device, a certain gap is formed between an image display unit and a frame surrounding the image display unit in accordance with an assembly relationship, and a backlight is exposed on a bottom surface of the image display unit. According to the image display device and the method of manufacturing the same of the present invention, the photocurable resin composition is interposed between the display side panel in which the image display unit and the protective unit are incorporated and the protective unit, and when the photocurable resin composition is photocured, the photocurable resin composition is set to have a specific viscosity, or the gap between the image display unit and the housing is closed by the sealing film, so that the photocurable resin composition can be prevented from entering the gap between the image display unit and the housing and being wound around to the backlight side.

Here, the photocurable resin composition used herein has a cure shrinkage of 5% or less, a transmittance in the visible light region of a resin cured layer obtained by photocuring the resin cured layer of 90% or more, and a storage elastic modulus at 25 ℃ of 1.0X 10⁷When Pa or less is used for the photocurable resin composition, the influence of stress on the image display unit and the protective unit during curing shrinkage of the resin can be minimized. Therefore, the image display unit and the protection unit are hardly deformed. In addition, the size of the gap between the image display unit and the frame does not change。

Therefore, according to the present invention, display with high luminance and high contrast can be performed without display failure, by the above-described synergistic effect.

Drawings

Fig. 1 is a sectional view of the protection portion.

Fig. 2 is an explanatory view of a method for manufacturing an image display device according to a first example of the present invention.

FIG. 3 is a sectional view showing a state where the photocurable resin composition is impregnated into the slit.

Fig. 4 is an explanatory view of a method for manufacturing an image display device according to a second example of the present invention.

Fig. 5 is an explanatory view of a method of manufacturing an image display device according to a third example of the present invention.

Fig. 6 is a cross-sectional view of a conventional image display device.

Description of the reference numerals

11-13 image display device

21. 24 display side panel

22 protective part

30. 61 frame body

31 base body

32 backlight lamp

33 image display unit

34 to 36, 134 photo-curable resin composition or photo-curable resin composition layer

37. 57 gap

41 transparent plate

42 light shielding film

44. 45, 46 resin cured layer

51 sealing film

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or equivalent components.

< first example >

Fig. 2 is a sectional view of a main part of a method of manufacturing the image display device 11 (see fig. d) according to the first example of the present invention. In the image display apparatus 11, the protective portion 22 is adhered to the display side panel 21 through the resin cured layer 44.

In the manufacturing process of the image display device 11, as shown in fig. 2(a), the display side panel 21 before being adhered with the resin cured layer 44 is configured such that the frame 30 surrounding the image display portion is disposed on the plate-shaped base 31, and the backlight 32 and the image display portion 33 formed of a liquid crystal panel smaller than the backlight 32 are disposed in this order on the base 31 inside the frame 30. The frame 30 may be integral with the base 31.

In this state, a gap 37 having a maximum width of mm is formed between the image display unit 33 and the housing 30, and the surface of the backlight 32 is exposed on the bottom surface of the gap 37.

On the other hand, as shown in fig. 1(a), the protection portion 22 is formed by printing a black opaque light shielding film 42 in the vicinity of the edge of the surface of a transparent plate 41 made of plastic such as optical glass or acrylic resin. The light shielding film 42 is provided to prevent external light from being reflected, to improve visibility of the image display device 11, and to prevent light from the backlight 32 from leaking to the surroundings. Further, a sheet-like or film-like member may be used as the protection portion 22.

In the method of manufacturing the image display device 11 of the first example, first, the high-viscosity photocurable resin composition 34 is applied from the slit 37 so as to extend over the image display portion 33 of the display-side panel 21 and the frame 30 in the above-described state. The viscosity of the photocurable resin composition 34 is high enough not to enter the slit 37, and specifically, it is 3000mPa · s to 12000mPa · s at 25 ℃ in a cone-plate rotational viscometer (cone angle C35/2 ° of cone plate, 10 rpm).

As a result, as shown in fig. 2(b), the photocurable resin composition layer 34 can be formed on the display side panel 21 with the void 37 left.

The coating amount of the photocurable resin composition 34 is preferably such that the thickness of the resin cured layer 44 after curing the photocurable resin composition layer 34 is 50 to 200 μm.

Next, the surface of the protective portion 22 on the light shielding film 42 side is directed to the display side panel 21, the transparent plate 41 is brought into contact with the surface of the photocurable resin composition layer 34, and the transparent plate 41 and the photocurable resin composition layer 34 are pressed so that air bubbles do not enter between the transparent plate 41 and the photocurable resin composition layer 34, whereby the transparent plate 41 and the photocurable resin composition layer 34 are brought into close contact with each other as shown in fig. 2 (c).

Thereafter, an ultraviolet lamp is turned on the protection portion 22, and ultraviolet rays are irradiated to the curable resin composition layer 34 through the transparent plate 41 to cure the curable resin composition layer, thereby forming a resin cured layer 44 as shown in fig. 2 (d). In this way, the image display apparatus 11 in which the protective portion 22 and the display side panel 21 are bonded to each other by the resin cured layer 44 is obtained.

In the case where the width of the light-shielding film 42 is wide and the ultraviolet rays of the lamp on the protective portion 22 do not sufficiently reach the photocurable resin composition layer 34 between the light-shielding film 42 and the display-side panel 21, the ultraviolet rays may be irradiated from the side of the display-side panel 21 and the protective portion 22.

In the obtained image display device 11, when the image display portion 11 is viewed from the protection portion 22 side, characters, figures, and the like formed in the image display portion 33 are viewed by the illumination light of the backlight panel 32.

In the first example, the photocurable resin composition layer 34 is formed on the display-side panel 21, but the photocurable resin composition layer 34 may be coated on the surface of the protective portion 22 on the light-shielding film 42 side, so that, as shown in fig. 1(b), the photocurable resin composition layer 34 is formed on the protective portion 22 in advance, and the protective portion is overlapped with the display-side panel 21 shown in fig. 2(a), and irradiated with ultraviolet rays in the same manner as described above, thereby forming the image display apparatus 11 shown in fig. 2 (d).

< second example >

Fig. 4 is a sectional view showing a main part of a method of manufacturing the image display device 12 according to the second example.

In the manufacturing method of the second example, a resin composition having a low viscosity (less than 3000mPa · s) is used as the photocurable resin composition, and when the photocurable resin composition is applied to the display side panel 21 as in the first example, the photocurable resin composition 134 flows into the slit 37 as shown in fig. 3. As shown in fig. 3, when the light-curable resin composition 134 flows into the slit 37, the light-curable resin composition 134 penetrates between the backlight 32 and the image display unit 33, and a display failure may occur.

Therefore, in the second example, before the photocurable resin composition is applied to the display-side panel 21, as shown in fig. 4(a), an adhesive sealing film 51 is disposed across the image display unit 33 and the housing 30 in the gap 37 of the display-side panel 21 in the state of fig. 2(a), and the gap 37 is closed. One end of the sealing film 51 in the width direction is in close contact with the image display unit 33, and the other end is in close contact with the housing 30, so that the slit 37 is sealed.

The sealing film 51 is preferably an adhesive film having a film base material such as polyethylene terephthalate and an adhesive layer or an adhesive layer of acrylic ester or the like.

The sealing film 51 is not necessarily required to have a solid adhesive layer or adhesive layer when disposed on the display side panel 21, and may have a high viscosity to such an extent that the sealing film does not enter the gap 37 and does not enter between the image display unit 33 and the backlight 32. More specifically, a curable resin composition having a viscosity of about 65000mPa · s can be used. Further, an adhesive having a thixotropic ratio of about 3 may be used as long as the adhesive does not enter the slit 37 and retains the shape of the base film.

Next, as shown in fig. 4(b), the photo-curable resin composition 35 is applied to the display side panel 21 so as to cover the image display unit 33, the sealing film 51, and the frame 30. Then, as described above, the protective portion in fig. 1(a) is superimposed on the display side panel 21 in the manner shown in fig. 4(c), and in this state, the photocurable resin composition layer 35 is irradiated with ultraviolet rays and cured, thereby forming a resin cured layer 45 as shown in fig. 4 (d). In this way, the image display device 12 of the second example in which the display-side panel 21 and the protective portion 22 are bonded to each other by the cured resin layer 45 in a state in which the slit 37 is sealed by the sealing film 51 is obtained.

In this example, the light-curable resin composition layer 35 is formed on the protective portion 22, and the image display device 12 of fig. 4(d) can be obtained by irradiating light with the display-side panel 21 in the state of fig. 4(a) being in close contact therewith as shown in fig. 4 (c).

< third example >

Fig. 5 is a sectional view showing a main part of a method of manufacturing an image display device 13 according to a third example.

As shown in fig. 5(a), the manufacturing method of the third example is different from the second example in that the display side panel 24 having the frame body 61 in which the projection 62 is provided around the side edge portion is used.

In the display side panel 24, a slit 57 is also formed between the frame 61 and the image display portion 33 so that the backlight 32 is exposed to the bottom surface.

Therefore, as shown in fig. (b), the sealing film 51 is first adhered to the slit 57 across the image display unit 33 and the frame 61, and the slit 57 is sealed.

Next, as shown in fig. c, the photocurable resin composition 36 is dropped onto the display side panel 24 so as to cover the image display unit 33, the sealing film 51, and the frame 61, and spread over the image display unit 33, thereby forming the photocurable resin composition layer 36. Then, as shown in fig. d, the same protection part 22 as described above is stacked on the photocurable resin composition layer 36. Here, since the projection 62 is provided around the frame 61 in the display side panel 24, there is an effect that the photocurable resin composition 36 does not flow out of the periphery of the frame 61 even if the photocurable resin composition 36 is dropped onto the display side panel 24. Therefore, in the third example, a photocurable resin composition having a lower viscosity than that in the second example can be used as the photocurable resin composition 36, and the degree of freedom regarding the viscosity of the photocurable resin composition 36 is increased.

After the protective part 22 is stacked on the photocurable resin composition layer 36, the photocurable resin composition layer 36 is cured by irradiation with ultraviolet rays, and as shown in fig. (e), a resin cured layer 46 is formed. In this way, the image display device 13 of the third example in which the protective portion 22 and the display side panel 24 are in close contact with each other through the resin cured layer 46 is obtained.

In the third example, the photocurable resin composition layer 36 may be formed on the protective part 22, and the image display device 13 of fig. 5(e) may be obtained by irradiating light with the display-side panel 24 in the state of fig. 5(b) in close contact therewith as shown in fig. 5 (d).

In any of the above first to third examples, the photocurable resin compositions 34 to 36 are preferably prepared such that the storage modulus of elasticity (25 ℃) of the cured resin is 1 × 10⁷Pa or less, more preferably 1X 10³～1×10⁶Pa, the refractive index of the cured resin is preferably 1.45 to 1.55, more preferably 1.51 to 1.52, and the transmittance in the visible light region is further preferably 100 μmPreferably 90% or more.

In general, even if the main resin components constituting the curable resin composition are common, when the resin components, monomer components, and the like are mixed together differently, there is a case where the storage elastic modulus (25 ℃) of the cured resin obtained by curing exceeds 1X 10⁷In the case of Pa, a resin composition which is a cured product of such a resin is not preferable as a photocurable resin composition.

When the storage elastic modulus exceeds the above range, unevenness of display color may occur.

The photocurable resin compositions 34 to 36 are prepared so that the cure shrinkage is preferably 5.0% or less, more preferably 4.5% or less, particularly preferably 4.0% or less, and still more preferably 0 to 2%. This reduces the internal stress accumulated in the cured resin when the photocurable resin compositions 34-36 are cured, and prevents the resin cured layers 44, 45, 46 from deforming at the interfaces with the display side panels 21, 24 or the protective part 22. Therefore, when the photocurable resin compositions 34 to 36 and 134 are cured with the photocurable resin compositions 34 to 36 interposed between the display panels 21 and 24 and the protective part 22, diffusion of light occurring at the interfaces between the resin cured layers 44, 45 and 46 and the display side panels 22 and 24 or the protective part 22 can be reduced, and the brightness of a display image and the visibility can be improved.

On the other hand, when the curing shrinkage ratio is outside the above range, color unevenness may occur.

The degree of internal stress accumulated in the cured resin material when the cured resin material is cured can be evaluated by the average surface roughness of the cured resin material obtained by dropping the resin composition onto a flat plate and curing the resin composition. For example, if 2mg of the resin composition is dropped on a glass plate or an acrylic plate and cured at a curing rate of 90% or more by UV irradiation, and the average surface roughness of the obtained cured resin is 6.0nm or less, the photocurable resin composition is interposed between the display side plate and the protective portion, and deformation occurring at the interface during curing can be practically ignored. In this connection, the photocurable resin compositions 34 to 36 preferably used in the present invention can have an average surface roughness of 6.0nm or less, preferably 5.0nm or less, and more preferably 1 to 3 nm. Therefore, distortion generated at the interface of the cured resin can be practically ignored.

Here, as the glass plate, a glass plate used as a glass plate for sandwiching liquid crystal of the liquid crystal cell or a glass plate used as a protective plate of the liquid crystal cell can be preferably used. Further, as the acrylic plate, an acrylic plate used as a protective plate for a liquid crystal cell can be suitably used. The average surface roughness of these glass plates and acrylic plates is usually 1.0nm or less.

As such a photocurable resin composition, for example, a resin composition containing: 1 or more polymers such as urethane acrylate (polyurethane acrylate), polyisoprene acrylate (polyisoprene acrylate) or esters thereof (esterified products), hydrogenated terpene resins (hydrogenated terpene resins), butadiene polymers (butadiene polymers) and the like, a photopolymerization initiator (photopolymerization initiator) such as isobornyl acrylate, 2-methyl-2-propenoic acid-2 [ (2, 3, 3A, 4, 7, 7A-hexahydro-4, 7-methylene-1 hydro-indenyl) oxy ] ethyl ester (dicyclopentenyloxymethyl methacrylate), 2-methyl-2-propenoic acid-2-hydroxybutyl ester (2-hydroxybutyl methacrylate), and 1-hydroxycyclohexylphenylketone (1-hydroxy-cyclohexyl-phenyl-ketone).

In addition, other additives, for example, a sensitizer, a plasticizer, transparent particles, and the like, may be added to the photocurable resin composition within the range of the object of the present invention.

In view of ultraviolet protection for the image display unit 33, the transparent plate 41 of the protection unit 22 often has a function of shielding the ultraviolet region. Therefore, as the photo-polymerization initiator, a photo-polymerization initiator that can be cured in a visible light region (for example, product name SpeedCure TPO, manufactured by Nihon siberhagner K.K, etc.) is preferable, and as the irradiation light, visible light is preferably used.

The image display device of the present invention can be applied to display portions of electronic devices such as a portable game machine, an electronic notebook, and a form measuring device, as well as a mobile phone, and to various flat panel displays such as an organic EL panel and a plasma display.

Examples

< example 1 corresponding to the first example >

(1) Preparation of resin composition 1

A urethane acrylate (trade name: UV-3000B, manufactured by Nihon Siberghen Kagaku K.K.) 70 parts by weight, isobornyl acrylate (trade name: IBXA, manufactured by Osaka organic chemical Co., Ltd.) 20 parts by weight, a photopolymerization initiator (trade name: Irgacure 184, manufactured by CIBASPECIL Chemicals) 4 parts by weight, and a photopolymerization initiator (trade name: SpeedCureTPO, manufactured by Nihon Siberghen K.K) 1 part by weight were put in a glass vessel and stirred to obtain a desired photocurable resin composition.

(2) Evaluation of resin composition 1

(2-1) viscosity

The viscosity (25 ℃) of the resin composition 1 obtained in (1) was measured with a cone-plate type rotational viscometer (manufactured by HAAKE, Inc., at a cone angle C35/2 ℃ and 10rpm of a cone plate), and was 10000 mPas.

(2-2) light transmittance

The resin composition 1 obtained in (1) was dropped onto a white glass plate having a thickness of 100 μm so as to have a predetermined film thickness, and the resultant was conveyed by a UV conveyor to obtain a cured resin.

The transmittance in the visible light region of the thus-obtained cured resin (thickness: 100 μm) was measured using an ultraviolet-visible spectrophotometer (manufactured by Nippon Kagaku Co., Ltd., V-560). As a result, the transmittance of the cured resin was 95% or more.

(2-3) storage modulus of elasticity

The cured resin obtained in the same manner as in (2-2) was measured for storage modulus of elasticity (Pa) (25 ℃ C.) at a measurement frequency of 1Hz using a viscoelasticity measuring apparatus (DMS 6100 manufactured by Seiko Instruments Inc.)⁶Pa。

(2-4) compression ratio of curing

The specific gravities of the resin liquid before curing and the solid after curing were measured using an electron densitometer (SD-120L manufactured by MIRAGE corporation), and the difference between the specific gravities was calculated by the following equation.

[ numerical formula 1]

Curing shrinkage (%) (cured product specific gravity-resin liquid specific gravity)/cured product specific gravity x 100

As a result, the curing shrinkage was 3.5%.

(2-5) surface roughness

2mg of the resin composition obtained in (1) was dropped onto a glass plate for a liquid crystal cell, and the strain (Ra: average surface roughness) of a predetermined region (2.93 mm. times.2.20 mm) of the surface of the glass plate caused by internal stress generated during UV curing was measured by a three-dimensional non-contact surface roughness meter manufactured by Zygo.

As a result, the surface roughness Ra was 4.5 nm.

(3) Bonding test of display side panel and protective portion

According to the manufacturing method of fig. 2, the resin composition 1 obtained in (1) is dropped onto the protective portion 22 having the light-shielding film 42, a cured resin composition layer is formed on the entire protective portion, and the protective portion 22 is inverted and arranged so as to be closely attached to the liquid crystal cell of the image display portion 33 as the display side panel 21 shown in fig. 2 (a). A gap 37 of 0.5mm is formed between the liquid crystal cell and the frame 30, and the backlight 32 is exposed at the bottom thereof, but the resin composition 1 does not enter the gap 37.

Subsequently, the resin composition 1 was cured by ultraviolet irradiation to form a resin cured layer 44, thereby completing the image display device 11.

< comparative example 1>

Resin composition 2 was prepared by using urethane acrylate (trade name UV-3000B, manufactured by japan synthetic chemical industry, inc.), isobornyl acrylate (trade name IBXA, manufactured by osaka organic chemical industry, inc.), a photopolymerization initiator (trade name Irgacure 184, manufactured by CIBASpecialty Chemicals), and a photopolymerization initiator (trade name SpeedCure TPO, manufactured by Nihon Siberhegner K.K) in the same manner as in example 1 except that the amounts thereof were changed, and viscosity, transmittance, cure compression ratio, and surface roughness were measured in the same manner as in example 1 to perform adhesion tests, and the results are shown in tables 1 and 2 and compared with example 1.

[ Table 1]

		Urethane acrylate(weight portion)	Acrylic acid isobornyl ester(weight portion)	Photopolymerization initiator (Total weight portion)	Viscosity (mPa. s)	Adhesion test (Presence or absence of immersion)
							Example 1	Resin composition 1	70	20	5	10000	Is free of
Comparative example 1	Resin composition 2	50	30	6	3000	Is provided with

[ Table 2]

		Transmittance (%)	Curing shrinkage (%)	Surface roughness (nm)	Storage modulus of elasticity (Pa)
						Example 1	Resin composition 1	More than 95	3.5	4.5	1×106
Comparative example 1	Resin composition 2	90	4.5	5.5	1×106

As is apparent from tables 1 and 2, when the viscosity is m3000Pa · s or less, the resin composition may be impregnated therein and an image may be defective regardless of the characteristics such as transmittance.

< example 2 corresponding to the second example >

(1) Production of sealing film

A100 μm thick polyethylene terephthalate substrate film was coated with a 100 μm thick acrylic adhesive and cut into a width of 5mm to obtain the desired sealing film.

(2) Bonding test of display side panel and protective portion

According to the manufacturing method of fig. 4, the sealing film 51 produced in the above (1) is attached so as to bridge the liquid crystal cell and the frame 30 in the gap 37(0.5mm) between the liquid crystal cell and the frame 30, which is the image display unit 33 of fig. 4 (a).

Next, the resin composition 2 is dropped onto the protective portion 22 having the light-shielding film 42, and a cured resin composition layer is formed on the entire protective portion, and the protective portion 22 is inverted and arranged so as to be in close contact with the liquid crystal cell of the image display portion 33 as the display side panel 21. A gap 37 of 0.5mm is formed between the liquid crystal cell and the frame 30, and the backlight 32 is exposed at the bottom thereof, but the resin composition 2 does not enter the gap 37 by the action of the sealing film 51. Subsequently, the resin composition 2 is irradiated with ultraviolet rays to be cured by ultraviolet rays, thereby forming the resin cured layer 45, and the image display device 12 is completed.

As described above, according to example 2 corresponding to the second example, even if the viscosity of the resin composition is 3000mPa · s or less, the penetration into the slit 37 can be prevented by the action of the sealing film 51.

< example 3 corresponding to the second example >

(1) Production of sealing film

After the peeling treatment, a 100 μm-thick polyethylene terephthalate film was coated with 50 μm-thick resin composition 1 of example 1 as an adhesive and cut into a width of 5mm to obtain the desired sealing film. At this time, the sealing film was not photo-cured.

(2) Bonding test of display side panel and protective portion

According to the manufacturing method of fig. 4, the sealing film 51 produced in the above-described example 3(1) was attached to the gap 37(0.5mm) between the liquid crystal cell and the frame body 30, which is to be the image display unit 33 of fig. 4(a), so as to bridge the liquid crystal cell and the frame body 33, and then the peeling film was peeled off.

Next, the resin composition 2 is dropped onto the protective portion 22 having the light-shielding film 42, and the photocurable resin composition layer is formed on the entire protective portion, and the protective portion 22 is reversed and arranged so as to be in close contact with the liquid crystal cell of the image display portion 33 as the display side panel 21. A gap 37 of 0.5mm is formed between the liquid crystal cell and the frame 30, and the backlight 32 is exposed at the bottom thereof, but the resin composition 2 does not enter the gap 51 by the action of the sealing film 51. Subsequently, the resin composition 2 is irradiated with ultraviolet rays to be cured by ultraviolet rays, thereby forming the resin cured layer 45, and the image display device 12 is completed. Furthermore, the resin composition 1 applied to the sealing film 51 as an adhesive is cured by ultraviolet curing at the time of forming the resin cured layer 45

Industrial applicability of the invention

The present invention can be used for an image display device such as a liquid crystal display device.

Claims (6)

1. A method of manufacturing an image display device includes: a step of forming a resin cured layer by interposing a photocurable resin composition between a display side panel having an image display unit and a frame surrounding the image display unit and a protective unit so as to straddle the image display unit and the frame and photocuring the resin cured layer, the method for manufacturing an image display device being characterized in that,

the photocurable resin composition used was a resin composition having a viscosity of 3000 mPas to 12000 mPas as measured at 25 ℃ with a cone-plate rotational viscometer at cone angles C35/2 ° and 10rpm of the cone plate.

2. The process according to claim 1, wherein the photocurable resin composition has a cure shrinkage of 5% or less and a cured product having a storage modulus of elasticity at 25 ℃ of 1.0X 10⁷Pa or less, and a light transmittance in a visible light region of the resin cured layer of 90% or more.

3. The production process according to claim 1 or 2, wherein a cured product of the photocurable resin composition has a storage modulus of elasticity at 25 ℃ of 1.0 x 10³～1.0×10⁶Pa。

4. The production method according to any one of claims 1 to 3, wherein the curing shrinkage of the photocurable resin composition is 4.0% or less.

5. The production method according to any one of claims 1 to 4, wherein the thickness of the resin cured layer is 50 to 200 μm.

6. The production method according to any one of claims 1 to 5, wherein the photocurable resin composition comprises: 1 or more polymers selected from urethane acrylate, polyisoprene acrylate or an esterified product thereof, a hydrogenated terpene resin, and a butadiene polymer, 1 or more polymers selected from isobornyl acrylate, 2-methyl-2-acrylic acid-2 [ (2, 3, 3A, 4, 7, 7A-hexahydro-4, 7-methylene-1 hydro-indenyl) oxy ] ethyl acrylate, and 2-methyl-2-acrylic acid-2-hydroxybutyl ester, and a photopolymerization initiator.