KR20140104334A - Display apparatus - Google Patents

Abstract

The application relates to a display device comprising a display panel; a backside element installed on the backside of the display panel; a packaging film packaging the backside element; and an adhesive layer formed between the display panel and the packaging film. The adhesive layer includes a photo hardening adhesive composition, having 1.0 x 106 dyne/cm^2 or greater of storage modulus at room temperature after the photo hardening. The packaging film includes a first area corresponding to the front face of the backside element; and a second area which is extended from the first area and corresponds to the side of the backside element. According to the application, an improved display device may be manufactured.

Description

Display device {DISPLAY APPARATUS}

The present application relates to a display device having an improved structure.

The display device is useful for various electronic products and the like. For example, devices such as liquid crystal displays (LCDs) are used in various products such as mobile phones, personal digital assistants (PDAs), electronic game machines, monitors, and TVs.

The display device has a display panel for displaying an image. Further, most of the display devices include backside elements provided on the back surface of the display panel. For example, a liquid crystal display (LCD) device includes a backlight unit (BLU) as a backside device.

1 is a cross-sectional view showing an example of a display device according to the related art, which specifically shows a liquid crystal display (LCD) device.

Referring to Fig. 1, a liquid crystal display (LCD) device has a liquid crystal display panel 10 for displaying an image. Generally, the liquid crystal display panel 10 can not emit light itself, and receives light from the outside to realize an image. Accordingly, a backlight unit 20 is provided on the back surface of the liquid crystal display panel 10 as a back surface element.

The backlight unit 20 includes a light source 22 such as a light emitting diode (LED) and a light source 22 for guiding the light of the light source 22 to the liquid crystal display panel 10. [ And a diffusion sheet 26 for diffusing the light emitted from the light guide plate 24. The light guide plate 24 is provided with a light guide plate 24,

In addition, the liquid crystal display panel 10 has a liquid crystal cell layer 12 made of liquid crystal in which light transmittance is changed as an electrical signal is applied. The liquid crystal display panel 10 changes or keeps the polarization direction of the linearly polarized light passing through the liquid crystal according to the arrangement state of the liquid crystal, thereby transmitting or blocking the light. To this end, the liquid crystal display panel 10 has a front polarizer 14 formed on the upper part of the liquid crystal cell layer 12 and a back polarizer 16 formed on the lower part of the liquid crystal cell layer 12.

In addition, a conventional display device including a liquid crystal display (LCD) device and the like includes a molding frame 30 for assembling the respective components. 1, the backlight unit 20 is stacked on the back surface of the liquid crystal display panel 10 and then assembled and fixed through a molding frame 30 made of a resin material.

For example, Korean Patent No. 10-0824866, Korean Patent No. 10-0876236, Korean Patent No. 10-0876248, and Korean Patent No. 10-1178577 disclose techniques related to the above.

However, due to the use of the molding frame 30 as described above, the display device according to the related art has a bezel B and a large area of the bezel B as shown in Fig. There is a problem that a screen on which an actual image is displayed compared to the surface area of the liquid crystal display panel 10 due to the bezel B is reduced.

In addition, the display device according to the related art may have problems such as handling and assembling of the back surface element, that is, the backlight unit 20, and the like. Optical members such as the light guide plate 24 and the diffusion sheet 26 are inserted and fixed in the molding frame 30 and are stacked on the back surface of the liquid crystal display panel 10 and assembled through the molding frame 30 An excessive time is required in the process, and the optical members 24 and 26 may be damaged. In addition, the assembly through the molding frame 30 may have a poor sealability, and a shape of a light beam may be generated. Such a problem causes an increase in cost and yield of the display device, and may adversely affect performance.

Korean Patent No. 10-0824866 Korean Patent No. 10-0876236 Korean Patent No. 10-0876248 Korean Patent No. 10-1178577

Accordingly, the present application provides a display device having an improved structure. The present application provides a display device capable of minimizing, for example, a bezel area.

In order to achieve the above object,

A display panel;

A rear surface element provided on a rear surface of the display panel;

A packaging film for packaging the backside element; And

And a pressure-sensitive adhesive layer formed between the display panel and the packaging film.

At this time, the pressure-sensitive adhesive layer includes a photocurable pressure-sensitive adhesive composition, and has a room temperature storage elastic modulus after photo-curing of 1.0 x 10 ⁶ dyne / cm 2 or more.

The packaging film may include, for example, a first region corresponding to a front surface of the rear surface element; And a second region extending from the first region and corresponding to a side surface of the backside element.

Further, the back surface element includes, for example, an optical element. The optical element includes, for example, a light guide plate for converting a point light source emitted from a light source into a surface light source; And a diffusion sheet for diffusing light emitted from the light guide plate. In addition, the optical element may further include a light source, for example.

According to the present application, an improved display device can be realized. For example, the bezel area can be minimized. Further, in the manufacturing (assembling) process of the display device, the damage of the components can be prevented, and the process can be simplified.

1 is a cross-sectional view showing an example of a conventional display device.
2 is a cross-sectional view of a display device according to the first embodiment.
3 is a cross-sectional view of the display device according to the second embodiment.
4 is a cross-sectional view of the display device according to the third embodiment.
5 is a plan view (developed view) showing the first embodiment of the packaging film.
6 is a cross-sectional view taken along line A-A 'in FIG.
7 is a plan view (developed view) showing a second embodiment of the packaging film.
8 is a plan view (developed view) showing a third embodiment of the packaging film.
9 is a plan view (developed view) showing a fourth embodiment of the packaging film.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

2 to 4 show exemplary embodiments of a display device according to the present application. 5 to 9 show exemplary embodiments of a packaging film for a display device according to the present application.

In the drawings, the same reference numerals as used in the appended drawings denote the same elements in the drawings.

The terms "first "," second ", "third ", and the like are used herein to distinguish one element from another, no.

In this specification, the terms indicating directionality, "front side", "side", "rear side" and the like are based on the direction viewed from the observer (viewer) side of the display device unless otherwise specified. 2, an observer (viewer) is positioned above the display panel 100 and looks at the display panel 100. As shown in FIG.

In the present specification, the meaning of "correspondence" includes that any one member (first member) is located opposite to the other member (second member), and faces facing each other in some or all of them.

As used herein, "light transmission" may mean that the light to be irradiated (e.g., visible light) has a transmittance on a vertical line of, for example, greater than 60%, such as greater than 80%, or for example greater than 90% have. Means that the light to be irradiated (e.g., visible light) is incident on the vertical line for example up to 40%, for example up to 30%, for example up to 20%, for example up to 10% It may mean having a transmittance.

In the present specification, the terms "formed on top", "formed on the bottom", and "formed on the side" mean that any one member (first member) is formed only in direct contact with the other member But also includes that another member (third member) is interposed between the members (between the first member and the second member).

In the present specification, the term " extending "does not mean that only one member (first member) extends integrally with the other member (second member), but two members (the first member and the second member Is a separate member that is detachable, and includes a case in which the shape itself is extended by engagement even if it is not integral.

A display device according to the present application includes a display panel 100; A backside element 200 installed on a rear surface of the display panel 100; A packaging film 300 for packaging the backside element 200; And a pressure sensitive adhesive layer 400 formed between the display panel 100 and the packaging film 300.

The packaging film 300 packages the backside device 200 installed on the rear surface of the display panel 100. The packaging film 300 encapsulates at least the front surface 201 and the side surface 202 of the backside element 200 to be packaged. The packaging film 300 includes a first region 310 corresponding to the front surface 201 of the backside element 200 and a second region 310 corresponding to the side surface of the backside element 200, And a second region 320 corresponding to the second region 202. At this time, the second region 320 extends from the first region 310. The display panel 100 and the packaging film 300 are attached to each other through a pressure-sensitive adhesive layer 400 formed therebetween.

According to the present application, an improved display device can be realized. The packaging film 300 and the pressure sensitive adhesive layer 400 adhere and fix the display panel 100 and the back surface element 200 to minimize a bezel area, for example. That is, according to the present application, the use of the molding frame 30 (see Fig. 1) is excluded, and a display device having almost no bezel can be realized. Further, according to the present application, problems occurring in the installation of the back surface element 200 and the like are improved. For example, the problems that may occur in handling and assembling of the optical element 200A and the like on the film (or sheet) are improved.

Hereinafter, exemplary embodiments of the present application will be described with reference to the accompanying drawings.

In the present application, the display panel 100 is not particularly limited. In the present application, the display panel 100 may be any as long as it can display an image.

The display panel 100 may include an element that displays an image by changing the light transmittance, for example, or an element that emits light to display an image. The display panel 100 may include a liquid crystal display panel (LCD Panel) for displaying an image through a liquid crystal whose light transmittance is changed, for example; A plasma display panel (PDP) in which a gas discharge occurs between two electrodes, and a phosphor emits light by ultraviolet rays generated by the gas discharge to display an image; And an organic electroluminescent display panel in which an organic light emitting diode (OLED) emits light to display an image by electrical excitation applied from an electrode.

2 to 4 illustrate an exemplary form of the display panel 100. In FIG. Figures 2-4 specifically illustrate a liquid crystal display (LCD) panel.

2 to 4, the display panel 100 includes at least one liquid crystal cell layer 120 and a polarizer formed on both sides of the liquid crystal cell layer 120, A front polarizer 140 formed on the upper portion of the liquid crystal cell layer 120 and a back polarizer 160 formed on the lower portion of the liquid crystal cell layer 120.

The liquid crystal cell layer 120 may include a thin film transistor (TFT) substrate, a color filter substrate facing the TFT substrate, And a liquid crystal cell in which the light transmittance is changed as an electrical signal is applied.

The front (upper) polarizing plate 140 and the rear (lower) polarizing plate 160 may have polarizing properties, and their optical axes may be orthogonal to each other. For example, the optical axis of the front polarizer 140 may be the longitudinal direction of the display panel 100, and the optical axis of the back polarizer 160 may be the lateral direction of the display panel 100. In addition to these, a pixel electrode or the like for driving a pixel may be formed in the display panel 100, and the illustration is omitted in the drawing.

The display panel 100 may further include a functional film or layer other than the liquid crystal cell layer 120, the front polarizer 140, and the back polarizer 160. The display panel 100 may further include, for example, a light diffusion layer, a viewing angle compensation film, a retardation film, an antireflection layer, an antiglare layer and / or a protective film layer for protecting them. These films or layers may be formed on the front polarizer 140 or the back polarizer 160, for example.

For example, at least one functional layer selected from a light diffusion layer, an antireflection layer, an antiglare layer, and a protective film layer for protecting the light diffusion layer, the antiglare layer, and the like may be further formed on the front polarizer 140. The functional layer may be laminated on the front polarizing plate 140 as a separate member, or may be formed directly on the upper surface of the front polarizing plate 140. For example, the anti-glare layer may be formed directly on the upper surface of the front polarizer 140 through a surface treatment such as a haze treatment.

In the present application, the back surface element 200 is not particularly limited as long as it is provided on the back surface of the display panel 100. The backside element 200 may be composed of one member or may have a multi-layer structure including two or more members. The shapes and functions of the members constituting the back surface element 200 are not limited. The backside element 200 may have, for example, a film, sheet, plate, and / or shape of a three-dimensional device. For example, the backside element 200 may include an electric / electronic element having an electric / electronic function; An optical element having an optical function; And / or a heat dissipation element having a heat dissipation function. The backside element 200 is wrapped and packaged by the packaging film 300 as described later.

2 illustrates an example of a backside element 200 constituted by one member. At this time, the back surface element 200 shown in FIG. 2 can be selected from, for example, the optical element 200A, the electronic circuit board, the heat sink, and the like. As a specific example, the backside element 200 can be selected from the optical element 200A.

In the present application, the optical element 200A is not limited as long as it has an optical function. In the present application, the optical element 200A can be exemplified by, for example, an element having functions such as light diffusion, light collection, polarization, and / or reflection, but is not limited thereto. Further, the optical element 200A may include a light source that generates light. In the present application, the optical element 200A includes a light source for generating light, and / or any kind of apparatus, film, and / or sheet used for processing light.

The optical element 200A may be at least one selected from a light guide plate, a diffusion sheet, a brightness enhancement film, a prism film, a lens film, a polarizing film, a reflection film, a viewing angle compensation film, a retardation film, And may include an optical member 200a.

In addition, the optical element 200A may be selected from a light source assembly that further includes a light source 240 in the optical member 200a as illustrated above. In the present application, the specific form of the light source assembly is not particularly limited, and may be selected, for example, from a conventional direct-type or edge-type light source assembly or the like. As a specific example, the light source assembly as optical element 200A can be selected from a backlight unit (BLU) commonly used in liquid crystal display (LCD) devices.

In Figs. 3 and 4, a multilayered optical element 200A is illustrated as the backside element 200. Fig. 3 shows an optical element 200A including a plurality of optical members 200a and FIG. 4 includes a plurality of optical members 200a and a light source 240 The optical element 200A shown in Fig.

Referring to FIG. 3, the optical element 200A includes an optical member 200a, which includes a light guide plate 210 for converting a point light source emitted from a light source into a surface light source; And a diffusing sheet 220 formed on the light guide plate 210 and diffusing light emitted from the light guide plate 210. In addition, the optical element 200A may further include a brightness enhancement film 230 formed on the diffusion sheet 220. Each of the optical members 200a may be formed of one layer or two or more layers. 3 illustrates a case where the brightness enhancement film 230 is formed in two layers. Such an optical element 200A is packaged by the packaging film 300 as shown in FIG. 3, and is installed on the rear surface of the display panel 100. 3, the light source for supplying the light to the light guide plate 210 is not shown, but the light source may be separately provided outside the light guide plate 210 to supply light to the light guide plate 210, for example.

4, the optical element 200A may be packaged by the packaging film 300 by forming a plurality of optical members 200a and the light source 240 in an assembly. Specifically, the optical element 200A is a light source assembly including a light source 240, which includes at least one light source 240; A light guide plate 210 formed on the light source 240 and converting the point light source emitted from the light source 240 into a surface light source; And a diffusion sheet 220 formed on the light guide plate 210 and diffusing light emitted from the light guide plate 210. As shown in FIG. 4, the optical element 200A may further include a brightness enhancement film 230 formed on the diffusion sheet 220. FIG.

In the present application, the light source 240 is not limited as long as it can emit light, and may be selected from, for example, a light emitting diode (LED) or the like.

The packaging film 300 packages the above-described back surface element 200, for example, the optical element 200A. At this time, in the case of the light source 240, it may not be packaged by the packaging film 300 as shown in FIG. 3, or may be packaged together with the optical member 200a as shown in FIG.

The packaging film 300 includes a first region 310 and a second region 320 extending from the first region 310. The first region 310 corresponds to the front surface 201 of the backside element 200 and the second region 320 corresponds to the side surface 202 of the backside element 200. In this case, The packaging film 300 further includes a third region 330, preferably for a rigid fixation of the backside element 200. The third region 330 extends from the second region 320 and corresponds to the backside 203 of the backside element 200. 5 to 9 illustrate exemplary embodiments of a packaging film 300. FIG.

At least a first region 310 and a second region 320 of the packaging film 300 have the same or similar area as the portion corresponding to the backside element 200, Lt; / RTI > For example, the area of the first area 210 is the same as or similar to the area of the front surface 201 (see FIG. 2) of the back-surface element 200, (See Fig. 2).

In addition, the second region 320 may be two or more. The second region 320 may be, for example, two to four. That is, the second region 320 may extend from the first region 310, and may extend from at least two of four sides of the first region 310. In addition, the third area 330 may be, for example, two to four, which may be the same as the number of the second areas 320. For example, three second regions 320 are formed in FIG. 5, and a third region 330 is also shown in a similar manner.

In the present application, the packaging film 300 is not limited as long as it further includes the first region 310 and the second region 320, and preferably the third region 330 as described above. In addition, each of the regions 310, 320, and 330 may be integrally formed. The packaging film 300 is cut so that a single film has the regions 310, 320 and 330 as described above so that the regions 310, 320 and 330 are integrally formed .

The packaging film 300 may be selected from a resin film, and the kind of the resin film is not limited. The packaging film 300 may be formed of a material such as polycarbonate, polyester, polyolefin, cyclo-olefin polymer, acrylic, urethane, epoxy, polyamide, And derivatives thereof, and the like can be used. For example, the packaging film 300 may be a polycarbonate (PC) film, a polyethylene terephthalate (PET) film, a polyethylene naphthalate (PEN) film, a polybutylene terephthalate (PBT) film, a polybutylene naphthalate ) Film, a polyethylene (PE) film, a polypropylene (PP) film, a cyclic polyethylene (PE) film, a cyclic polypropylene (PP) film, an acrylic film, a triacetylcellulose (TAC) film and / But are not limited thereto. For example, the packaging film 300 may be made of a non-oriented polycarbonate (PC) film or a non-oriented polyethylene terephthalate (PET) film, or the like. have.

The packaging film 300 may be selected from a light-transmitting film. The packaging film 300 may have optical properties such as polarization, light collection and / or diffusion depending on the case. At least the first region 310 may have such optical properties. In this case, it may be useful for packaging of the optical element 200A.

Also, the packaging film 300 may be selected from an isotropic film. In the present application, the isotropy means that there is only a phase difference that does not have a phase difference or is very small even in the presence of a phase difference and does not substantially affect the phase of light passing through the film.

The packaging film 300 may have a planar phase difference (Rin) of, for example, 30 nm or less. The packaging film 300 can be formed by a method in which the retardation Rin of the packaging film 300 calculated by the following equation 1 is 30 nm or less, or 25 nm or less, specifically 0 to 30 nm, 0 to 25 nm, 0.1 To 20 nm. In addition, the packaging film 300 may have a thickness direction retardation (Rth) of, for example, 35 nm or less. The packaging film 300 is a film having a thickness direction retardation Rth calculated by, for example, the following formula (2), for example, 35 nm or less, or 30 nm or less, specifically 0 to 35 nm, 0 to 30 nm, 0.1 to 25 nm. In this application, the phase difference (Rin) (Rth) is an absolute value.

[Equation 1]

Rin = d X (nx - ny)

Dx is the thickness (unit: nm) of the packaging film 300 and nx is the thickness of the packaging film 300 for light with a wavelength of 400 to 600 nm. And ny is the refractive index in the fast axis direction of the packaging film 300 with respect to the wavelength of 400 to 600 nm.

&Quot; (2) "

Rth = d X (ny - nz)

Dy is the thickness (unit: nm) of the packaging film 300 and ny is the thickness of the packaging film 300 for light having a wavelength of 400 to 600 nm. And nz is the refractive index in the thickness direction of the packaging film 300 with respect to the wavelength of 400 to 600 nm.

The packaging film 300 may be made of, for example, a non-oriented polycarbonate film, a non-oriented polyester film, a non-oriented acrylic film, a non-oriented triacetylcellulose film, and / Polyolefin-based films, and the like.

When packaging the backside element 200, the regions 310, 320, and 330 are bent at the boundaries C1 and C2. In the drawing, the boundary lines C1 and C2 between the regions 310, 320 and 330 are indicated by dotted lines. At this time, each of the boundary lines C1 and C2 is shown for convenience of explanation, and it may be displayed substantially on the packaging film 300 or not.

In packaging the rear surface element 200 using the packaging film 300, for example, first the first area 310 is first positioned corresponding to the front surface 201 of the rear element 200, The second region 320 is bent in the first region C1 so that the second region 320 is positioned corresponding to the side surface 202 of the backside element 200. When the third region 330 is further included, the third region 330 may be bent at the second boundary line C2 so that the third region 330 may contact the rear surface 203 of the rear surface element 200, And then packaged.

According to an exemplary embodiment, the packaging film 300 and the backside element 200 may have mutual adhesion. The adhesive force may be, for example, at the contact interface between the packaging film 300 and the backside element 200.

The method of attaching the packaging film 300 and the back surface element 200 is not particularly limited and may be performed by, for example, applying a thermal and / or optical laminating method. For example, the packaging film 300 may be heat-sealed and fused, or may be fused to each other by light irradiation to be mutually attached. At this time, the packaging film 300 may be adhered to the back-surface element 200 by, for example, at least one selected from the second region 320 and the third region 330. In the attachment through the laminating method, the irradiation condition of heat and light may be appropriately selected depending on the type of the packaging film 300, and is not particularly limited.

According to another exemplary embodiment, the packaging film 300 and the backside element 200 can be adhered to each other through separate attachment means. The attachment means may include, for example, a pressure-sensitive adhesive layer (not shown) formed between the packaging film 300 and the back-surface element 200. In order to distinguish the pressure sensitive adhesive layer from the pressure sensitive adhesive layer 400 formed between the packaging film 300 and the display panel 100, the second pressure sensitive adhesive layer is hereinafter referred to as a 'second pressure sensitive adhesive layer'.

The second pressure sensitive adhesive layer may be formed on the contact interface between the packaging film 300 and the back surface element 200 so as to provide a bonding force therebetween. The second pressure sensitive adhesive layer may be formed by coating the packaging film 300 and / or the backside element 200. For example, the second pressure sensitive adhesive layer may be formed on at least one selected from at least the second region 320 and the third region 330. More specifically, the second pressure sensitive adhesive layer is formed on the inner side of at least the second region 320 and / or the third region 330 among the respective regions 310, 320 and 330 of the packaging film 300 And may be formed on a surface that contacts the backside element 200.

As described above, the packaging film 300 and the back surface element 200 are bonded to each other by at least a second region 320 and a side surface 202 , And / or between the third region 330 and the backside 203. As shown in FIG.

Further, the attachment means may be, for example, a double-sided or one-sided adhesive tape. At this time, the double-sided adhesive tape may be interposed between the packaging film 300 and the backside element 200. More specifically, the double-sided adhesive tape may be interposed between the second area 320 and the side surface 202 and / or between the third area 330 and the back surface 203. [ In the case of the one-sided pressure-sensitive adhesive tape, for example, it may be taped at the outer surface of the third region 330 to provide a bonding force with the backside element 200.

Referring to FIGS. 5 and 6, a notch 350 may be formed on a boundary line C1 between the first and second regions 310 and 320. 6, when the packaging film 300 further includes the third region 330, the notch portion 350 may be formed as a boundary line between the second region 320 and the third region 330 C2. 6 is a sectional view taken on line A-A 'in Fig.

In the present application, the notch portion 350 may be such that the second region 320 and the third region 330 can be easily bended at each of the boundary lines C1 and C2. The notch portion 350 may be formed through a notch process that can generate a thickness step at, for example, the boundary lines C1 and C2. For example, the notch portion 350 may be selected from an osmosis treatment portion formed by pressing the boundary lines C1 and C2 and a half cutting portion formed by half-cutting the boundary lines C1 and C2 . In the present application, the half does not only mean half the thickness of the packaging film 300.

The notch 350 may be formed to a depth of, for example, 1/3 to 2/3 of the thickness of the packaging film 300 by ozone treatment or half cutting, but is not limited thereto. In addition, the notch 350 may be formed continuously along the boundary lines C1 and C2 or discontinuously formed at predetermined intervals. That is, the notch 350 may be formed discontinuously in the form of a dotted line as shown by the boundary lines C1 and C2. For example, the notch 350 may be selected from a plurality of fine holes drilled at predetermined intervals along the boundary lines C1 and C2. In the present application, Is not particularly limited as long as the regions 310, 320, and 330 are easily bended at each of the boundary lines C1 and C2.

The notch 350 may have an elongation of 50 to 80% of the elongation before forming the notch 350. Specifically, when notch processing (for example, osse processing) is performed on each of the boundary lines C1 and C2, the elongation of the notch 350 may be 50 to 80% of the elongation before the notch processing. For example, assuming that the elongation of the packaging film 300 is two times (= 100%), the elongation of the notch 350 is 50 to 80% Fold (i.e., a stretch of 50 to 80%). If the elongation percentage of the notch portion 350 is out of the above range, for example, the notch portion 350 may not be bendable or may be broken.

The thickness of the packaging film 300 is not particularly limited. The thickness of the packaging film 300 may be variously set in consideration of the bending workability of each of the regions 310, 320, and 330, the handling properties during packaging, and / or the film thickness of the film 300. According to an exemplary embodiment, the thickness of the packaging film 300 may satisfy the following equation (3) with the area of the first region 310. [

&Quot; (3) "

y [m] = x [m2] + a

Where x is the area of the first region 310 (transverse x length, unit: m 2), and a is the number of 40 to 43 (unit: to be. Here, a includes not only integers but also prime numbers.

When the thickness of the packaging film 300 satisfies the above formula (3), bending workability of each of the regions 310, 320, and 330, handling during packaging, and thinning of the film 300 may be advantageous. The thickness of the packaging film 300 may vary depending on the area of the first region 310. However, the thickness of the packaging film 300 may be in the range of, for example, 50 탆 to 500 탆, 60 탆 to 400 탆, or 80 탆 to 200 탆 .

Also, the packaging film 300 may have one or more mechanical properties selected from, for example, (a) a tensile modulus of at least 1,200 MPa, (b) a tensile strength of at least 40 MPa, and (c) Lt; / RTI > In the case of having such physical properties, the back surface element 200 can be packaged and favorably supported.

Depending on the backside element 200. However, when the tensile modulus is less than 1,200 MPa or the tensile strength is less than 40 MPa, for example, the supporting force of the backside element 200 may become insignificant. In view of this, the packaging film 300 may have a tensile modulus of at least 1,400 MPa, and / or a tensile strength of at least 50 MPa. The upper limit of the tensile modulus and the tensile strength is not particularly limited.

The packaging film 300 may have a specific tensile modulus of, for example, 1,200 to 5,000 MPa, 1,400 to 4,000 MPa, 1,600 to 3,000 MPa, 1,800 to 2,500 MPa, or 2,000 to 2,400 MPa. Further, the packaging film 300 may have a tensile strength of, for example, 40 to 200 MPa, 45 to 180 MPa, 50 to 150 MPa, or 60 to 120 MPa.

In addition, if the elongation is less than 20%, for example, handling during packaging may be deteriorated. The upper limit of the elongation is not limited, but may be, for example, 200% or less in consideration of the supporting force depending on the load of the back surface element 200. [ In view of this, the packaging film 300 may have an elongation of, for example, 30% to 180%, 40% to 160%, or 60% to 150%.

In the present application, the method of measuring the tensile modulus, tensile strength and elongation is not limited. For example, the tensile modulus and the tensile strength can be measured according to a tensile tester commonly used in the field of film production. In the case of the elongation, for example, A is the initial gauge distance of the film 300 in the tensile tester, B is the gauge distance at the time of breaking after stretching, %) = (AB) / A x 100].

In addition, the packaging film 300 may have a small strain so as to secure a firm fixing force and durability. In the packaging film 300, for example, it is preferable that the strain E measured by the following formula (4) is 5% or less. The strain E is preferably as close to zero as possible.

&Quot; (4) "

E (%) = [(L2 - L1) / L1] x 100

L 1 is the initial length (width or length) of the packaging film 300 and L 2 is the length of the packaging film 300 after being left for 24 hours with a load of 3 kg at a temperature of 80 캜. . The packaging film 300 has a stretchability of 2 mm or more when left for 24 hours with a load of 3 kg at a temperature of 80 캜, for example, on the basis of a size of 60 x 25 mm (width x length) Or less.

In addition, the packaging film 300 may have an endurance strength of, for example, at least 200 times, at least 300 times, or at least 400 times of an endurance index (MIT) measured by a test prescribed in JIS P8115 Lt; / RTI >

Referring to FIG. 5, the third area 330 may be formed with an overlap prevention processing unit 360. That is, when the third area 330 is bent and attached to the back surface 203 of the rear surface element 200, the third area 330 is provided with the overlap prevention processing section 330 so that the adjacent third areas 330 do not overlap with each other, (360) may be formed.

The overlap prevention processing unit 360 can be selected from the cut-out portion 361 cut at a predetermined angle?, For example. At this time, the angle [theta] of the chamfered portion 361 may be, for example, from 15 degrees to 85 degrees, or from 30 degrees to 60 degrees. More specifically, for example, the angle? Of the incised portion 361 may be 30 degrees or more, or 45 degrees or more. The overlapping portion 361 can be prevented from overlapping with the adjacent third region 330. The angle? Of the cut-out portion 361 in the present application means the side inclination angle of the third region 360 with reference to the straight line extending line of the second region 320 as shown in Fig. 5 .

7 shows another embodiment of the overlap prevention processing unit 360. The overlap prevention processing unit 360 shown in Fig. Referring to FIG. 7, the overlap prevention processing unit 360 can be selected from the cut portion 362 cut and removed to a predetermined length L. FIG. At this time, the length L of the cutting portion 362 may be equal to or greater than the width W ₃₃₀ of the adjacent third region 330, for example. This overlapping with the third area 330 adjacent to the cutting area 362 can also be prevented.

Also, according to an exemplary embodiment, at least the first region 310 among the respective regions 310, 320, and 330 may have light transmittance (transparency). The first region 310 may have a light transmittance of 80% or more, specifically a light transmittance of 90% or more, 95% or more, or 98% or more, for example. In this case, it is advantageous in packaging the optical element 200A.

In addition, in the second region 320 and the third region 330, at least the second region 320 may have light-transparency. That is, it is preferable that the second region 320 has a light-transmitting property so that light leakage to the side is prevented. The second region 320 may have a light transmittance of, for example, 10% or less, 5% or less, 1% or less, 0.1% or less, or 0%. In the present application, the light-transmittance includes the meaning of light shielding for blocking light, and reflection for reflecting light. For this light-permeability, at least the second region 320 may comprise at least one light-scattering layer selected from, for example, a light-shielding layer and a reflective layer. Also in the case of the third region 330, it may have the above-mentioned light-transparency.

The light shielding layer may be formed by coating a light shielding material on the second region 320, for example. In addition, the reflective layer may be formed by coating a reflective material on the second region 320, for example. In this application, the term "coating" includes general coatings such as bar coating or spray coating as well as coating methods such as printing or deposition, as well as general coatings .

The materials constituting the light-shielding layer and the reflective layer are not particularly limited. As the light-shielding material, for example, a material having a color such as black can be used. Specific examples of the light-blocking material include inorganic materials selected from carbon black, graphite, iron oxide, azo-based pigment and / or phthalocyanine- And the like. Further, the reflective material may be a reflective material such as a metal selected from aluminum, titanium, silica, alumina, and / or titania, and a metal oxide, for example. These light-shielding and reflective materials may be coated by a printing process in combination with, for example, a binder and / or a solvent. And in the case of metal and metal oxides for reflectivity, can be deposited through deposition.

Referring to FIG. 8, a photodeflective processing unit 314 may be formed at the edge of the first region 310. 8, the first region 310 has a main region 312 of light transmittance (transparency), and a light-permeable treatment portion 314 is formed along the periphery of the main region 312 . The light-permeable treatment portion 314 may have a light-permeable property (light-shielding ability), which may be selected, for example, from a print layer formed by printing a light-permeable paint. In addition, the light-transmittance treatment section 314 may be selected from the light-shielding layer and the reflective layer as described above. For example, the light-transparency treatment unit 314 may be formed by coating a light-shielding material (colored material) such as an inorganic material and an organic material selected from carbon black, graphite, iron oxide, azo-based pigment and phthalocyanine-based pigment.

In the case where the light-emitting unit 314 is formed at the magnetic field of the first region 310 as described above, it is possible to completely block the light leakage to the side. The second region 320 may be light-permeable so that the light leakage to the side is prevented. However, when bending the packaging film 300, for example, the second region 320 may not be accurately bent at the boundary lines C1 and C2, A light ray may be generated on the side surface. In addition, in the process of packaging the packaging film 300, the first region 310 may be offset to one side so that the edge of the first region is located on the side surface 202 of the optical element 200A, . In such a case, the light-permeable treatment unit 314 can cut off the light to the side by blocking the light.

The thickness and the width W ₃₁₄ of the light-permeable treatment portion 314 are not particularly limited. The width W ₃₁₄ may be, for example, 5 占 퐉 or more. At this time, when the width W ₃₁₄ is less than 5 탆, the tolerance preventing function may be insignificant. The upper limit is not particularly limited, but if the width W ₃₁₄ is excessively large, the screen may be excessively clogged. For example, the upper limit is preferably 50 μm or less. Accordingly, the gwangbul transmission processing 314 is, for example, may have a width (W _314), from 5 to 50㎛ and, more specific, for example 10 ~ 40㎛, or of 20 to 30㎛ width (W ₃₁₄ ). The area of the photodiode 314 may be, for example, 0.01 to 5% of the total area of the first area 310, more specifically 0.5 to 2%.

Referring to FIG. 9, according to an exemplary embodiment, the first region 310 may be provided with a protrusion 315 in which the second region 320 is not extended. 9, the second region 320 may be formed to extend from the first region 310 and have a step 316 without extending from the vertex 310a of the first region 310. In other words, So that the first region 310 may be provided with the protrusion 315. That is, the vertex 310a of the first region 310 may protrude.

In the case where the protrusion 315 is provided as described above, that is, when the first region 310 is provided with the protrusion 315 that does not extend the second region 320, Can be prevented. The thickness of the first region 310 may be different from that of the first region 310 when the second region 320 is bent in the absence of the protrusion 315 as shown in FIG. Stress may be exerted and lifting may occur. When the projecting portion 315 is provided, the lifting phenomenon as described above can be prevented.

2 to 4, the packaging film 300 is adhered and fixed to the display panel 100 through the adhesive layer 400.

According to an exemplary embodiment, the front surface of the packaging film 300 may be easily adhered to the surface. Specifically, adhesion can be easily handled at least on the front surface of the first area 310, that is, the surface (upper surface in the drawing) contacting with the pressure-sensitive adhesive layer 400. [ In the present application, the easy-to-attach treatment is not limited as long as it can improve the adhesion of the packaging film 300 and the pressure-sensitive adhesive layer 400. This adhesion facilitating treatment improves the adhesion at the contact interface between the packaging film 300 and the pressure-sensitive adhesive layer 400, which ultimately increases the fixing force between the display panel 100 and the packaging film 300.

The easy-to-attach treatment may include at least one selected from, for example, corona treatment and primer treatment. The manner of the corona treatment and the primer treatment is not particularly limited, and they can be applied to any known method for improving adhesion in the field of film processing. For example, the primer treatment may include a method of forming a primer layer by coating primers such as acrylic, urethane, and epoxy. The primer layer may have a thickness of, for example, 500 nm or less. As a specific example, the primer layer may have a thickness of from 2 to 300 nm, or from 5 to 200 nm.

In addition, the back surface of the packaging film 300 may have an uneven surface. Concretely, at least the uneven surface may be formed on the back surface of the first region 310, that is, the surface (lower surface in the drawing) contacting with the back surface element 200. This uneven surface can prevent fusion of the first area 310 and the back surface element 200 after packaging. More specifically, referring to FIG. 3, fusion between the back surface (lower surface in the drawing) of the first region 310 and the front surface (upper surface in the drawing) of the brightness enhancement film 230 can be prevented.

The uneven surface may be formed in various ways, and may be formed, for example, by a mat process and a haze process. Through such processing, the roughness of the uneven surface, for example, RMS roughness may be 0.1 탆 or more, 0.5 탆 or more, or 1.0 탆 or more. For example, the uneven surface may be a surface having an RMS roughness of 0.1 탆 to 10 탆, 0.5 탆 to 8 탆, or 1.0 탆 to 5 탆. The uneven surface may have a haze of 80% or less, or 70% or less. For example, the uneven surface may be a surface having a haze of 40% to 80% or 50% to 70% or so. In some cases, the uneven surface may be a high hardness surface having a high hardness, for example, a pencil hardness of 1B or more, or 2B or more. For example, the uneven surface may be a surface having a pencil hardness of about 1B to 4B, or about 2B to 4B.

Further, the uneven surface may be formed, for example, through a concavo-convex resin layer. For example, in the process of forming the resin layer, an imprinting process, a process of forming an uneven surface by transferring the uneven shape using a mold, a bead The uneven surface can be formed on the resin layer.

The uneven resin layer may include, for example, a room temperature curable type, a moisture curing type, a thermosetting type or a photocurable resin composition in a cured state. In one example, the uneven resin layer may include a thermosetting or photocurable resin composition or a photocurable resin composition in a cured state. The room temperature curable, moisture curable, thermosetting or photocurable resin composition as used herein means a composition which can be induced in the cured state at room temperature or in the presence of appropriate moisture by application of heat or irradiation of an active energy ray .

For example, the resin composition for the uneven resin layer may include an acrylic compound, an epoxy compound, a urethane compound, a phenol compound and / or a polyester compound as a main component. In the above, the "compound" may be a monomeric, oligomeric or polymeric compound.

As another example, an acrylic resin composition excellent in optical properties such as transparency and excellent in resistance to yellowing, for example, a photo-curable acrylic resin composition can be used as the resin composition for the uneven resin layer. Such a photocurable acrylic resin composition may include, for example, an active energy ray polymerizable polymer component and a reactive diluting monomer.

Examples of the polymer component include a component known as an active energy pre-polymerizable oligomer such as urethane acrylate, epoxy acrylate, ether acrylate or ester acrylate, or a monomer such as a (meth) acrylic acid ester monomer or the like Can be exemplified. Examples of the (meth) acrylic acid ester monomer include alkyl (meth) acrylate, (meth) acrylate having an aromatic group, heterocyclic (meth) acrylate or alkoxy (meth) acrylate.

Examples of the reactive diluting monomer which can be contained in the photocurable acrylic composition include monomers having one or more photocurable functional groups such as an acryloyl group or a methacryloyl group. As the reactive diluting monomer, for example, the above (meth) acrylic acid ester monomers, multifunctional acrylates, and the like can be used.

The selection of the above-mentioned components for producing the photocurable acrylic composition, the blending ratio of the selected components and the like are not particularly limited and can be adjusted in consideration of the hardness and other physical properties of the desired resin layer.

In the process of forming the uneven resin layer using the resin composition, unevenness can be formed in the resin layer in an appropriate manner, or the uneven surface can be realized by including beads in the resin layer. In this case, when the beads are included, the beads may have a refractive index that is different from or substantially equivalent to that of the resin layer. When the beads have different refractive indices from the resin layer, a side effect of inducing the diffusion of light through the uneven resin layer can be obtained.

The shape of the beads contained in the irregular resin layer is not particularly limited and may be, for example, spherical, elliptical, polyhedral, amorphous, and / or other shapes. Examples of specific types of beads include various inorganic and / or organic beads. Examples of the inorganic beads include silica, amorphous titania, amorphous zirconia, indium oxide, alumina, amorphous zinc oxide, amorphous cerium oxide, barium oxide, calcium carbonate, amorphous barium titanate and / or barium sulfate Examples of the organic beads include particles containing a crosslinked product or a non-crosslinked product of an organic material such as an acrylic resin, a styrene resin, a urethane resin, a melamine resin, a benzoguanamine resin, an epoxy resin and / But is not limited to.

The method of forming the uneven surface in the resin layer without using the bead is not particularly limited. For example, the resin composition may be cured in a state in which the coating layer of the resin composition is brought into contact with a mold having a desired concavo-convex structure, or an uneven surface may be realized through an imprinting method or the like.

In some cases, the resin composition may be formed so that the uneven resin layer has a high hardness, so that the uneven resin layer serves as a hardened layer. In this case, the hardness of the uneven resin layer can be adjusted to have, for example, a pencil hardness in the range described above.

2 to 4, a barrier layer 500 may be formed on a side surface of the display panel 100. Referring to FIG.

The barrier layer 500 may be at least capable of blocking external moisture from penetrating into the display panel 100. To this end, the barrier layer 500 may have at least water impermeability (moisture barrier properties). The barrier layer 500 is required to be capable of blocking moisture such as moisture as well as to prevent gas such as outside air from penetrating. For this purpose, the barrier layer 500 has moisture impermeability, It may have gas impermeability.

In the present application, the barrier layer 500 is not particularly limited as long as it has at least moisture barrier property. The barrier layer 50 may include at least one selected from, for example, a moisture-barrier resin layer, a metal thin film layer, and a vapor deposition layer.

The moisture barrier resin layer may be, for example, a film layer formed by attaching a moisture barrier resin film to the side surface of the display panel 100, or a resin coating layer coated on the side surface of the display panel 100 . The resin composition constituting the moisture barrier resin layer is not limited, and includes a thermosetting type and a light-curing type. In addition, the moisture barrier resin layer may have, for example, one layer or two or more layers.

The moisture barrier resin layer may be formed of a resin such as a styrene resin, a polyolefin resin, a thermoplastic elastomer, a polyoxyalkylene resin, a polyester resin, a polyvinyl chloride resin, a polycarbonate resin, a polyphenylene sulfide resin, A mixture of hydrocarbons, a polyamide resin, an acrylate resin, an epoxy resin, a silicone resin, a fluorine resin, and / or a mixture thereof.

Examples of the styrene resin include styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), acrylonitrile-butadiene-styrene block copolymer (ABS) , Acrylonitrile-styrene-acrylate block copolymer (ASA), styrene-butadiene-styrene block copolymer (SBS), styrene homopolymer and / or mixtures thereof. As the olefin-based resin, for example, a high-density polyethylene-based resin, a low-density polyethylene-based resin, a polypropylene-based resin, and / or a mixture thereof may be exemplified. As the thermoplastic elastomer, for example, an ester thermoplastic elastomer, an olefin thermoplastic elastomer and / or a mixture thereof may be used. Among them, a polybutadiene resin and / or a polyisobutene resin may be used as the olefinic thermoplastic elastomer. As the polyoxyalkylene resin, for example, a polyoxymethylene resin, a polyoxyethylene resin and / or a mixture thereof can be exemplified. As the polyester resin, for example, a polyethylene terephthalate resin, a polybutylene terephthalate resin and / or a mixture thereof can be exemplified. As the polyvinyl chloride resin, for example, polyvinylidene chloride and the like can be mentioned. As the mixture of hydrocarbons, for example, hexatriacotane and / or paraffin can be exemplified. As the polyamide-based resin, for example, nylon and the like can be mentioned. As the acrylate resin, for example, polybutyl (meth) acrylate and the like can be mentioned. Examples of the epoxy resin include bisphenol type epoxy resins such as bisphenol A type, bisphenol F type, bisphenol S type and water additives thereof; Novolak types such as phenol novolac type and cresol novolak type; Nitrogen-containing cyclic rings such as triglycidyl isocyanurate type and hydantoin type; Alicyclic type; Fat type; Aromatic types such as naphthalene type and biphenyl type; Glycidyl types such as glycidyl ether type, glycidyl amine type and glycidyl ester type; Dicyclopentane type such as dicyclopentadiene type; Ester type; Ether ester type and / or mixtures thereof. As the silicone resin, for example, polydimethylsiloxane and the like can be mentioned. Examples of the fluororesin include polytrifluoroethylene resin, polytetrafluoroethylene resin, polychlorotrifluoroethylene resin, polyhexafluoropropylene resin, polyfluorinated vinylidene, polyfluorinated vinyl, polyfluoro / RTI > ethylene propylene and / or mixtures thereof.

The resin listed as the component of the moisture barrier resin layer may be grafted with, for example, maleic anhydride, or may be copolymerized with a monomer for producing the resin to be arrayed, or may be modified by other compounds It is possible. Examples of the other compounds include carboxyl-terminated butadiene-acrylonitrile copolymers and the like.

The resin listed as a component of the moisture barrier resin layer may be a resin having a functional group capable of being cured by heat such as a glycidyl group, an isocyanate group, a hydroxyl group, a carboxyl group and / or an amide group, Or an active energy ray such as an epoxide group, a cyclic ether group, a sulfide group, an acetal group and / or a lactone group, Lt; RTI ID = 0.0 > and / or < / RTI > curable functional groups or moieties.

According to an exemplary embodiment, the moisture barrier resin layer may include a polyisobutene resin. The polyisobutene resin is hydrophobic and can exhibit low moisture permeability and low surface energy. Specific examples of the polyisobutene resin include homopolymers of isobutylene monomers; And / or a copolymer obtained by copolymerizing an isobutylene monomer and other monomer capable of polymerization can be used. Here, other monomers capable of polymerization with the isobutylene monomer may include, for example, 1-butene, 2-butene, isoprene, and / or butadiene.

As a component of the moisture barrier resin layer, a base resin having a weight average molecular weight (Mw) of about a degree that can be formed into a film can be used. According to an exemplary embodiment, the weight average molecular weight (Mw) may be in the range of about 100,000 to 2,000,000, 100,000 to 1,500,000 or 100,000 to 100,

According to another exemplary embodiment, the moisture barrier resin layer may further include a moisture removing agent in addition to the resin component as described above. Thus, the moisture barrier property of the moisture barrier resin layer can be further improved. For example, the moisture removing agent may be dispersed evenly in the resin layer. Here, the evenly dispersed state may mean a state in which the moisture-scavenging agent is present at the same or substantially the same density in any portion of the water-barrier resin layer.

Examples of the moisture removing agent include metal oxides, sulfates, and organic metal oxides. Examples of the metal oxide include magnesium oxide, calcium oxide, strontium oxide, barium oxide, and aluminum oxide. Examples of the sulfate include magnesium sulfate, sodium sulfate, nickel sulfate, and the like. And examples of the organic metal oxides include aluminum oxide octylate and the like.

As the water-scavenging agent, one kind of the above-mentioned components may be used, or two or more kinds may be used. In the case of using two or more kinds of water-removing agents, for example, calcined dolomite and the like may be used.

The moisture scavenger may have an appropriate size. In one example, the average particle diameter of the moisture scavenger may have a size on the order of 10 to 15,000 nm. The moisture removing agent having the above-described range can effectively block moisture. The content of the moisture removing agent may be, for example, in the range of 5 to 250 parts by weight based on 100 parts by weight of the resin that can be used as the water barrier resin layer as described above.

In addition, the moisture barrier resin layer may further include a dispersing agent so that the moisture removing agent can be uniformly dispersed in the resin layer. As the dispersing agent that can be used here, for example, a nonionic surfactant having affinity with a surface of a hydrophilic water-removing agent and having good compatibility with a resin can be used. According to another exemplary embodiment, the moisture barrier resin layer may include a thermosetting and photo-curing pressure-sensitive adhesive composition as described in the pressure-sensitive adhesive layer 400 as long as it has moisture barrier properties.

The metal thin film layer may be a metal foil having a thickness of, for example, 1 m to 300 m, and may be attached to the display panel 100 through, for example, an adhesive so as to cover the barrier layer 500 .

The deposition layer is formed by depositing at least one selected from a metal and a metal oxide, and it is formed on a base film such as a base film such as polyethylene terephthalate (PET), polyethylene (PE) or polypropylene (PP) And then attached to the display panel 100 together with the base film to form the barrier layer 500. [0050]

The metal forming the barrier layer 500, specifically, the metal thin film layer or the deposition layer may be formed of a metal such as aluminum (Al), copper (Cu), nickel (Ni), tin (Sn) (A single metal or a mixture of single metals) selected from the group consisting of zinc (Zn), indium (In), silver (Ag), tungsten (W) and iron Alloys, and the like, but are not limited thereto. In the case of the metal oxide which can be used as the deposition layer, for example, aluminum oxide (Al ₂ O ₃ ), silicon oxide (SiO ₂ ), tin oxide (SnO ₂ ), indium oxide (In ₂ O ₃ ) Zinc (ZnO) and the like.

In addition, the barrier layer 500 may include a moisture barrier resin layer as described above, and the moisture barrier resin layer may be formed by applying a resin composition (pressure-sensitive adhesive composition) such as a thermosetting and photo- The resin layer may have peel force (adhesive force) of 2.5 kgf / inch or more. The upper limit of the peeling force is not limited. In the case of having such a peeling force, for example, it is possible to strengthen the bonding force to the display panel 100 having a multi-layer structure. Specifically, the liquid-impermeable resin layer adheres and fixes the liquid crystal cell layer 120, the front polarizing plate 140, and the back polarizing plate 160 on the side surface, thereby enhancing their bonding force. For example, the peel force of the water barrier resin layer may be 2.5 to 20.0 kgf / inch.

Meanwhile, in the present application, the pressure-sensitive adhesive layer 400 may be formed between the display panel 100 and the packaging film 300 so that they can be attached and fixed. The pressure-sensitive adhesive layer 400 may be formed, for example, by coating on the packaging film 300, that is, coating the first region 310 of the packaging film 300. In addition, the pressure-sensitive adhesive layer 400 may be formed on the display panel 100 by coating a coating, for example, on the back polarizing plate 160. As another example, the pressure-sensitive adhesive layer 400 may be formed by a transfer method. Specifically, the pressure-sensitive adhesive layer 400 may be coated on a separate release film and then transferred onto the display panel 100 or the packaging film 300 to be formed.

The pressure-sensitive adhesive layer 400 may be formed from a pressure-sensitive adhesive composition. At this time, the pressure-sensitive adhesive composition may be transparent, for example, having a light transmittance of 80% or more. The pressure-sensitive adhesive composition may be exemplified as follows. The pressure-sensitive adhesive composition illustrated below may be applied to the pressure-sensitive adhesive layer 400, that is, the pressure-sensitive adhesive layer 400 formed between the display panel 100 and the packaging film 300, as well as the second pressure- 300 and the backside element 200. The second pressure-sensitive adhesive layer may be formed between the backside element 300 and the backside element 200.

In the present application, the pressure-sensitive adhesive composition includes, for example, a photocurable and / or thermosetting pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition may include, for example, a monomer or a polymer component. The monomer or polymer component may undergo a curing process to form the base of the pressure-sensitive adhesive layer (400). The term " polymer " in the present application collectively refers to a compound in which two or more monomers are polymerized, and is used in the meaning including, for example, a component commonly referred to as an oligomer. In the field of the production of pressure-sensitive adhesives, various monomers or polymer components used to form pressure-sensitive adhesive compositions are known, and these components can be used without limitation in the present application. Such monomers or polymers include, for example, acrylics, urethanes and / or epoxies.

The pressure-sensitive adhesive composition may be, for example, a thermosetting pressure-sensitive adhesive composition. In this case, in the thermosetting pressure-sensitive adhesive composition, the polymer component contained therein may be, for example, an acrylic polymer having a crosslinkable functional group. As the acrylic polymer, for example, those having a weight average molecular weight (Mw) of about 500,000 or more can be used. In the present specification, the term weight average molecular weight (Mw) means a value converted to standard polystyrene measured by GPC (Gel Permeation Chromatograph). As the acrylic polymer, for example, a polymer having a glass transition temperature (Tg) of about -24 캜 to -16 캜 may be used. A specific kind of such an acrylic polymer is not particularly limited, and a polymer commonly used as an adhesive resin, for example, a (meth) acrylic acid alkyl ester, and a polymerizable monomer capable of providing a crosslinkable functional group at a side chain or terminal of the polymer ≪ / RTI > can be used.

Specific examples of the alkyl (meth) acrylate ester include alkyl (meth) acrylates having an alkyl group having 1 to 14 carbon atoms such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate or ethyl Alkyl (meth) acrylate, and the like. As the polymerizable monomer, a monomer having both a copolymerizable functional group such as an ethylenic double bond and a crosslinkable functional group such as a hydroxyl group, a carboxyl group, an epoxy group, an isocyanate group and / or an amide group at the same time can be used.

The weight ratio of each monomer contained in the acrylic polymer having a crosslinkable functional group is not particularly limited and may be adjusted in consideration of the initial adhesive force, adhesive force and cohesion force of the desired pressure-sensitive adhesive layer (400). In addition, the acrylic polymer may contain, if necessary, various copolymerizable monomers other than those described above in a polymerized form.

The pressure-sensitive adhesive resin constituting the pressure-sensitive adhesive composition of the present invention, that is, the above-mentioned polymer may be used in a polymerization method commonly used in the field of pressure-sensitive adhesive production, for example, solution polymerization, photo polymerization, polymerization, suspension polymerization, or emulsion polymerization, for example.

Further, the thermosetting pressure-sensitive adhesive composition may further include, for example, an acrylic polymer and a multifunctional crosslinking agent capable of crosslinking the acrylic polymer. In this case, the type of the specific crosslinking agent is not particularly limited, and for example, a crosslinking agent such as an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent and a metal chelate crosslinking agent can be used. The ratio of the cross-linking agent in the pressure-sensitive adhesive composition is not particularly limited and can be appropriately adjusted in consideration of the desired cohesive force.

The pressure-sensitive adhesive composition may, for example, be a photocurable pressure-sensitive adhesive composition. The term "photocurable pressure-sensitive adhesive composition" in the present application means a composition which is irradiated with light, that is, a curing process is induced by irradiation of an electromagnetic wave to be converted into a pressure-sensitive adhesive. In this case, the electromagnetic wave may be microwaves, infrared rays, ultraviolet rays, X-rays, gamma rays or alpha-particle beams, proton beams, neutron beams, And electron beams (particle beams).

In the photocurable pressure-sensitive adhesive composition, the monomer or polymer component may comprise a photocurable oligomer and a reactive diluting monomer. The photo-curable oligomer is not particularly limited as long as it can be cured by light, and it is selected from all the oligomer components used in the production of a photocurable pressure-sensitive adhesive composition such as ultraviolet (UV) curing type in the field of pressure- . The photo-curable oligomer is, for example, urethane acrylate obtained by reacting a polyisocyanate having two or more isocyanate groups in a molecule with a hydroxyalkyl (meth) acrylate; Ester type acrylate obtained by dehydration condensation reaction of polyester polyol and (meth) acrylic acid; Ester-based urethane acrylate obtained by reacting ester-based urethane resin obtained by reacting polyester polyol and polyisocyanate with hydroxyalkyl acrylate; Ether-based acrylates such as polyalkylene glycol di (meth) acrylate and the like; Ether-based urethane acrylate obtained by reacting an ether-based urethane resin obtained by reacting a polyether polyol and a polyisocyanate with a hydroxyalkyl (meth) acrylate; And an epoxy acrylate obtained by addition reaction of an epoxy resin and (meth) acrylic acid, but are not limited thereto.

The reactive diluting monomer can be used without particular limitation, for example, as long as it is a monomer having a reactive functional group such as a (meth) acryloyl group in the molecular structure. These monomers can serve to control the viscosity of the composition and to achieve adhesion after curing. Such monomers include, for example, alkyl (meth) acrylates; Hydroxy group-containing monomers such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate and / or hydroxybutyl (meth) acrylate; Carboxyl group-containing monomers such as (meth) acrylic acid and / or beta-carboxyethyl (meth) acrylate; Alkoxy group-containing monomers such as 2- (2-ethoxyethoxy) ethyl (meth) acrylate and the like; Aromatic group-containing monomers such as benzyl (meth) acrylate and / or phenoxyethyl (meth) acrylate; Monomers containing heterocyclic moieties such as tetrahydrofurfuryl (meth) acrylate and / or (meth) acryloyl morpholine; and the like; And polyfunctional acrylates, and the like, but are not limited thereto.

The specific types and blending ratios of the photocurable oligomer and the reactive diluting monomer are not particularly limited and may be suitably selected in consideration of the viscosity of the intended composition and the adhesive property to be achieved after curing.

According to another exemplary embodiment, the monomer or polymer component constituting the photocurable pressure sensitive adhesive composition may be a photocurable syrup. The photocurable syrup may be a monomer mixture or a partial polymer thereof including a (meth) acrylic acid ester monomer such as alkyl (meth) acrylate and the like.

Examples of the (meth) acrylic esters contained in the monomer mixture include alkyl (meth) acrylates having a straight chain or branched alkyl group having 1 to 14 carbon atoms as exemplified above, such as methyl (meth) acrylate, ethyl (Meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (Meth) acrylate, n-octyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) (Meth) acrylate, lauryl (meth) acrylate and / or tetradecyl (meth) acrylate, and examples of the copolymerizable monomer or other copolymerizable monomer capable of providing the above-A polymerizable monomer, for example, the above-described oligonucleotide which include meona reactive diluent monomer can be exemplified.

When the pressure-sensitive adhesive composition contains, as the syrup, a partial polymer of the above-mentioned monomer mixture, the polymerization rate of the monomer mixture or the conversion ratio of the monomer is not particularly limited. For example, the polymerization rate or the conversion rate can be controlled in consideration of process efficiency, desired adhesive property, and the like.

The photo-curable pressure-sensitive adhesive composition may also include a pressure-sensitive adhesive composition including another so-called Interpenetrating Polymer Network (hereinafter referred to as " IPN "). The term " IPN " in this application may refer to a state in which at least two or more crosslinking structures exist in the pressure-sensitive adhesive layer 400, and in one example, the crosslinking structures may be entanglement, linking, or penetrating. When the pressure-sensitive adhesive layer 400 contains IPN, the pressure-sensitive adhesive layer 400 having excellent durability under severe conditions and excellent workability, light-scattering ability, and the like can be realized.

In the pressure-sensitive adhesive composition capable of forming the pressure-sensitive adhesive layer (400) including the IPN structure, the monomer or polymer component constituting the pressure-sensitive adhesive composition may be, for example, an acrylic polymer. In this case, examples of the acrylic polymer that can be used include the acrylic polymer used in the above-described thermosetting pressure-sensitive adhesive composition.

In addition, the photocurable pressure-sensitive adhesive composition may further include the multifunctional crosslinking agent and the photocurable multifunctional compound mentioned in the item of the thermosetting pressure-sensitive adhesive composition together with the acrylic polymer. The photo-curable polyfunctional compound may mean a compound containing two or more functional groups that can be polymerized by irradiation with light. The pressure-sensitive adhesive layer 400 formed through such a composition may include, for example, a crosslinked structure including an acrylic polymer crosslinked by a polyfunctional crosslinking agent and a crosslinked structure including the polymerized polyfunctional compound.

As the photocurable multifunctional compound, for example, a multifunctional acrylate may be used. As the polyfunctional acrylate, for example, a compound having two or more (meth) acryloyl groups in the molecule can be used without limitation. Examples of the polyfunctional acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, polyethylene glycol di Acrylate, neopentylglycol adipate di (meth) acrylate, hydroxyl puivalic acid neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate Acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate, di (meth) acryloxyethyl isocyanurate, allyl cyclohexyl di Acrylate, trimethylolpropane di (meth) acrylate, trimethylolpropane di (meth) acrylate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentanedi Di (meth) acrylate, neopentyl glycol-modified trimethylpropane di (meth) acrylate, adamantane di (meth) acrylate or 9,9-bis [4- 2-hydroxypropyl) phenyl] fluorene; (Meth) acrylates such as trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri Trifunctional acrylates such as modified trimethylolpropane tri (meth) acrylate, trifunctional urethane (meth) acrylate or tris (meth) acryloxyethylisocyanurate; Tetrafunctional acrylates such as diglycerin tetra (meth) acrylate or pentaerythritol tetra (meth) acrylate; Pentafunctional acrylates such as propionic acid-modified dipentaerythritol penta (meth) acrylate; And dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate or urethane (meth) acrylate (e.g., an isocyanate monomer and trimethylolpropane tri A hexafunctional acrylate such as a reaction product, etc. In some cases, known as a photo-curable oligomer in the field of pressure sensitive adhesive production, various urethane acrylates, polycarbonate acrylates, polyester acrylates, polyether acrylates Rate and epoxy acrylate, and the like may also be used.

The ratio of the acrylic polymer, the crosslinking agent and the photo-curable polyfunctional compound in the pressure-sensitive adhesive composition is not particularly limited and can be controlled by the physical properties of the desired pressure-sensitive adhesive.

In addition, in the present application, the pressure-sensitive adhesive composition may further contain a radical initiator such as a photoinitiator or a thermal initiator in addition to the above-mentioned components, and a conventional radical initiator may be used. For example, the photo-radical initiator is not particularly limited as long as it can generate a radical by irradiation of an electromagnetic wave and initiate a curing reaction. The proportion of such photo-radical initiator is also not particularly limited and may be selected within a range in which an appropriate curing reaction of the photo-curable components contained in the composition can be induced.

The pressure-sensitive adhesive composition may further contain at least one additive selected from the group consisting of a silane coupling agent, a tackifier resin, an epoxy resin, a curing agent, a UV stabilizer, an antioxidant, a colorant, a reinforcing agent, a filler, a defoamer, a surfactant, May be further included. The curing agent may be one commonly used in the manufacture of pressure sensitive adhesives. For example, one or more selected from the group consisting of an epoxy group and an isocyanate group may be used.

The method of forming the pressure-sensitive adhesive layer (400) by using the pressure-sensitive adhesive composition as described above is not particularly limited. In the process of forming the pressure-sensitive adhesive layer 400, a curing process may be performed by applying heat and / or irradiating light. In this case, in the curing process, the packaging film 300 and the adherend are attached through the pressure-sensitive adhesive layer 400, for example, after attaching the display panel 100 to the first region 310, . The heat application conditions and the light irradiation conditions are not particularly limited, and can be performed, for example, under conditions that ensure the properties of the desired pressure-sensitive adhesive layer (400). For example, the irradiation of light can be performed using a means such as a high-pressure mercury lamp, an electrodeless lamp, or a xenon lamp. The illuminance at the time of light irradiation is controlled within a range of, for example, 50 mW / cm 2 to 2,000 mW / cm 2, and the light amount can be controlled within a range of 10 mJ / cm 2 to 1,000 mJ / But is not limited to.

The pressure-sensitive adhesive layer 400 is formed at least between the display panel 100 and the first region 310 as described above. At this time, depending on the case, the pressure-sensitive adhesive layer 400 may require a resistance force capable of responding to an external force.

For example, in a high temperature and / or high humidity condition, a wave can be generated between the first region 310 and the second region 320 of the packaging film 300. More specifically, in the case of the first region 310, there is no shrinkage and expansion due to adhesion and confinement to the pressure-sensitive adhesive layer 400, but in the case of the second region 320, contraction expansion may occur under high temperature and / . A wave is generated between the first region 310 and the second region 320 by the contraction and expansion of the second region 320 and the first region 310 is formed by the wave, Stress may be generated at the edge of the substrate. At this time, lifting may occur between the first region 310 and the pressure-sensitive adhesive layer 400 due to the stress.

For example, when the weight of the display panel 100 and the backside element 200 is large, the pressure-sensitive adhesive layer 400 may have a resistance against the shear force of the display panel 100 and the backside element 200, Should be able to do. That is, the pressure-sensitive adhesive layer 400 should not be pressed to secure a cohesive force capable of resisting the shear force applied by the load of the display panel 100 and the back-surface element 200.

For this, the pressure-sensitive adhesive layer 400 includes a photocurable pressure-sensitive adhesive composition, and has a storage modulus at room temperature after photo-curing of 1.0 x 10 ⁶ dyne / cm 2 or more. That is, the pressure-sensitive adhesive layer 400 is preferably formed by curing the photo-curable pressure-sensitive adhesive composition, and has a storage elastic modulus measured at room temperature after photo-curing of 1.0 x 10 ⁶ dyne / cm 2 or more. The room temperature storage modulus in this application is based on a conventional measurement method, which may be a value measured, for example, through a dynamic viscoelasticity measuring instrument. As used herein, the term ambient temperature refers to a natural, non-warming or non-warming temperature that may vary from season to season, but can range, for example, from about -10 캜 to 50 캜, from about 5 캜 to 40 캜, from about 10 캜 to 30 캜 , Or about 15 < 0 > C to 25 < 0 > C.

When the pressure-sensitive adhesive layer 400 has a room temperature storage elastic modulus of 1.0 x 10 ⁶ dyne / cm 2 or more, the pressure-sensitive adhesive layer 400 may have resistance against an external force. That is, it is possible to prevent lifting of the first region 310 and the pressure-sensitive adhesive layer 400 by absorbing stress caused by expansion and contraction under high-temperature and / or high-humidity conditions. At the same time, a cohesive force capable of coping with the shearing force is secured and is not pushed. At this time, when the room temperature storage elastic modulus of the pressure-sensitive adhesive layer 400 is less than 1.0 x 10 ⁶ dyne / cm 2, the pressure of the pressure-sensitive adhesive layer 400 becomes soft and the stress caused by the contraction expansion of the second region 320 The cohesive force capable of corresponding to the shearing force due to the load of the display panel 100 and the back surface element 200 can be lowered.

The room temperature storage modulus, since the figure is higher the glass, the upper limit is because particularly, but not limited to, the absorption of stress (stress) as the case may be too high, the low excitation may occur, which, for example, 1.0 x 10 ⁸ dyne / cm < 2 >.

In addition, according to an exemplary embodiment, the pressure-sensitive adhesive layer 400 may include a pressure-sensitive adhesive resin having a weight average molecular weight (Mw) of 1,000,000 or more. When the pressure-sensitive adhesive layer (400) contains a high molecular weight adhesive resin having a weight average molecular weight (Mw) of 1,000,000 or more, it is advantageous in improving the cohesive force. In order to improve the cohesive force, that is, the cohesive force capable of coping with the shear force, a method of increasing the degree of crosslinking of the adhesive resin through the hardener may be considered. However, if the crosslinking degree of the adhesive resin is excessively increased by using the curing agent in excess, the cohesive force is improved, but the absorption force against the stress caused by the contraction expansion of the second region 320 is lowered and lifting may occur.

Therefore, when a high molecular weight having a weight average molecular weight (Mw) of 1 million or more is used as the adhesive resin, the cohesive force of the pressure-sensitive adhesive layer 400 is improved even if the crosslinking is not caused by the curing agent or by the use of a small amount of the curing agent . At this time, the higher the weight average molecular weight (Mw) of the pressure-sensitive adhesive resin is, the higher the upper limit is not particularly limited, but it may be, for example, 5 million or less. The kind of the adhesive resin is as described above, and can be selected, for example, from the photocurable acrylic copolymer as described above.

According to an exemplary embodiment, the pressure-sensitive adhesive layer 400 may be formed from a photocurable pressure-sensitive adhesive composition comprising an acrylic copolymer, a photo-curable polyfunctional acrylate, and a curing agent. Further, if necessary, a photoinitiator and the like may be further included. The types of components constituting the photocurable pressure-sensitive adhesive composition are as described above. When the display panel 100 and the back surface element 200 are attached to each other using the photocurable pressure-sensitive adhesive composition, when UV light is irradiated, the polyfunctional acrylate cures to secure strong adhesive properties.

According to a more specific embodiment, the pressure-sensitive adhesive layer 400 may comprise 2 to 30 parts by weight of a polyfunctional acrylate capable of photo-curing and 0.001 to 10 parts by weight of a curing agent, based on 100 parts by weight of the acrylic copolymer. Further, if necessary, 0.001 to 10 parts by weight of a photoinitiator may be added to 100 parts by weight of the acrylic copolymer.

According to an exemplary embodiment, the pressure-sensitive adhesive layer 400 satisfies the room temperature storage elastic modulus, the weight average molecular weight (Mw) and / or the degree of crosslinking as described above, and the adhesion area 25 with the packaging film 300 at room temperature or 80 ° C When a vertical load of 1 kgf is applied to a length of 25 mm (width x length) for 4 hours, the pushing distance can be a cohesive force of 0.2 mm or less.

According to the present invention described above, an improved display device is realized. For example, after the backside element 200 such as the optical element 200A is packaged by the packaging film 300, it is attached to the back side of the display panel 100 through the pressure-sensitive adhesive layer 400, The area is minimized. That is, the use of the molding frame for fixing the display panel 100 and the back-surface element 200 is eliminated, and a free-bezel display device having almost no bezel can be realized.

Also, excessive time consuming and damage to the optical element 200A, which may occur in the handling and assembly of the back-surface element 200, for example, the optical element 200A on the film (or sheet) . In addition, in the case of the optical element 200A, for example, the optical element 200A is packaged with the packaging film 300 so as to have a sealing property, thereby preventing light scattering.

Examples and Comparative Examples are illustrated below. At this time, the following comparative examples are provided for comparison with the embodiments, and are not excluded from the scope of the present application.

[Examples and Comparative Examples]

An acrylic pressure-sensitive adhesive resin was synthesized with the components and contents as shown in the following Table 1, and a curing agent was mixed with the acrylic pressure-sensitive adhesive resin and then coated / cured on a polycarbonate (PC) film to form a pressure-sensitive adhesive layer.

With respect to the coated specimens, the room temperature storage modulus, lifting phenomenon, and pushing distance (room temperature and 80 ° C) were evaluated in the following manner, and the results are shown together in Table 1 below.

1. At room temperature storage modulus

The coated specimen was cut to a size of 15 cm x 25 cm (width x length), and the PC film was peeled off. Then, it was placed on a parallel plate of a dynamic viscoelasticity measuring apparatus, the gap was adjusted, the zero point of Normal & Torque was set, the normal force was stabilized, and the room temperature storage modulus was measured. Specific measuring instruments and measuring conditions are as follows.

* Measuring instruments: ARES-RDA, TA Instruments Inc. with forced convection oven

* Measuring conditions

- geometry: 8 mm parallel plate

- gap: around 1 mm

- test type: dynamic strain frequency sweep

- strain = 5.0 [%]

- temperature: normal temperature (25 ℃)

- initial frequency: 0.1 rad / s, final frequency: 100 rad / s

2. Extension

The coated specimen of 15 cm x 25 cm (width x length) was placed in a constant temperature / humidity chamber at a temperature of 60 ° C and a humidity of 90%, left for 240 hours, and examined for microscopic difference between the PC film and the pressure-sensitive adhesive layer. The cases where there was no excrement were evaluated as 'good' and the cases where excrement occurred were evaluated as 'excrement'.

3. Pushing distance

The coated specimens were cut to a size of 25 mm x 25 mm (width x length), and a vertical load of 1 kgf was applied at room temperature (about 15 DEG C) and 80 DEG C for 4 hours, respectively. Observed and evaluated.

≪ Results of Characteristic Evaluation of Pressure-Sensitive Adhesive Layer According to Examples and Comparative Examples > Remarks Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Adhesive resin
(Parts by weight) BA / HBA
99/1 BA / AA
94/6 EHA / MA / AA
65/25/10 EHA / MA / AA
68/25/7 BA / HBA
99/1 BA / AA
94/6 EHA / MA / AA
65/25/10 EHA / MA / AA
68/25/7 Mw 1.7 million 176 million 112 million 116 million 1.7 million 176 million 112 million 116 million P 12 12 12 12 0 0 0 0 Hardener 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 G ' 1.7
x10 ⁶ 6.5
x10 ⁶ 7x10 ⁶ 4.5x10 ⁶ 4.7x10 ⁵ 6.7x10 ⁵ 8.3x10 ⁵ 6.8x10 ⁵ Lifting phenomenon Good Good Good Good Lifting Lifting Good Good Pushed distance
(Room temperature) none none none none 0.2mm none none none Pushed distance
(80 DEG C) 0.17mm 0.16 mm 0.12 mm 0.15mm 1.8mm 0.43mm 0.8mm 1.1mm - BA: butyl acrylate
- AA: Acrylic acid
- EHA: 2-ethylhexyl acrylate
- MA: methyl acrylate
- HBA: hydroxybutyl acrylate
- Mw: weight average molecular weight of adhesive resin
- P: polyfunctional acrylate (using tris [2- (acryloyloxy) ethyl] isocyanurate as a trifunctional acrylate), 100 parts by weight of a pressure-sensitive adhesive resin standard
- Hardener: isocyanate curing agent, based on 100 parts by weight of adhesive resin
- G ': storage modulus at room temperature (dyne / cm 2)

As shown in Table 1, in the case of the specimens according to the examples, there was no lifting after standing for a long time at a high temperature / high humidity (60 ° C / 90%) condition and a pushing distance at room temperature and 80 ° C was 0.2 mm and excellent cohesive force was secured.

100: display panel 120: liquid crystal cell layer
140: front polarizer 160: back polarizer
200: Rear element 200A: Optical element
200a: optical member 210: light guide plate
220: diffusion sheet 230: luminance enhancement film
240: light source 300: packaging film
310: first area 314: light-permeable treatment part
320: second area 330: third area
350: Notch 360: Overlap prevention processor
361: a corner portion 362: a cutting portion
400: pressure-sensitive adhesive layer 500: barrier layer

Claims (12)

A display panel;
A rear surface element provided on a rear surface of the display panel;
A packaging film for packaging the backside element; And
And a pressure-sensitive adhesive layer formed between the display panel and the packaging film,
Wherein the pressure-sensitive adhesive layer comprises a photo-curable pressure-sensitive adhesive composition, wherein a room temperature storage elastic modulus after photo-curing is 1.0 x 10 ⁶ dyne / cm 2 or more.
The method according to claim 1,
Wherein the pressure-sensitive adhesive layer comprises an acrylic copolymer, a photo-curable polyfunctional acrylate, and a curing agent.
3. The method of claim 2,
Wherein the pressure-sensitive adhesive layer comprises 2 to 30 parts by weight of a polyfunctional acrylate capable of photo-curing, and 0.001 to 10 parts by weight of a curing agent, based on 100 parts by weight of the acrylic copolymer.
The method according to claim 1,
Wherein the pressure-sensitive adhesive layer has a pushing distance of 0.2 mm or less when a load of 1 kgf is applied to a bonding area of 25 mm x 25 mm (width x length) with a packaging film at room temperature or 80 캜 for 4 hours.
The method according to claim 1,
Wherein the packaging film comprises:
A first region corresponding to a front surface of the rear surface element; And
And a second region extending from the first region and corresponding to a side surface of the rear surface element.
6. The method of claim 5,
Wherein the packaging film further comprises a third region extending from the second region and corresponding to a backside of the backside device.
The method according to claim 6,
Lt; RTI ID = 0.0 > 2, < / RTI >
The method according to claim 1,
Wherein the back surface element includes an optical element.
9. The method of claim 8,
Wherein the optical element comprises:
A light guide plate for converting the point light source emitted from the light source into a surface light source; And
And a diffusion sheet for diffusing light emitted from the light guide plate.
10. The method of claim 9,
Wherein the optical element further comprises a brightness enhancement film formed on the diffusion sheet.
9. The method of claim 8,
Wherein the optical element comprises:
Light source;
A light guide plate for converting the point light source emitted from the light source into a surface light source; And
And a diffusion sheet for diffusing light emitted from the light guide plate.
12. The method of claim 11,
Wherein the optical element further comprises a brightness enhancement film formed on the diffusion sheet.

Images