KR20170064161A - Optical cleared adhesive and foldable display device including the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a foldable display device, and more particularly to a foldable display device having improved durability.
A feature of the present invention is that the cover window, the touch panel, the display panel, and the back plate are attached and integrated through the adhesive layer in the form of a double-sided tape-shaped optical adhesive layer having an embossed pattern formed thereon.
This makes it possible to improve the durability of the display device itself without restriction by the optical adhesive layer in the folding and unfolding of the display device.
Therefore, it is also possible to prevent the display quality of the display panel from deteriorating, and it is also possible to prevent the display panel from being damaged.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical adhesive layer for a display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable display device, and more particularly to an optical adhesive layer for a display device having improved durability and a display device including the same.

2. Description of the Related Art [0002] In recent years, as the society has become a full-fledged information age, a display field for processing and displaying a large amount of information has rapidly developed, and a variety of flat display devices have been developed Be in the spotlight.

Specific examples of such a flat panel display device include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) Devices such as an electroluminescence display device (ELD) and an organic light emitting diode (OLED). These flat panel display devices have excellent performance in reducing the thickness, weight, and power consumption of a conventional cathode ray tube : CRT).

On the other hand, such a flat panel display uses a glass substrate to withstand the high heat generated during the manufacturing process, and thus has a limitation in providing light weight, thinness, and flexibility.

Therefore, a flexible display device which is manufactured so as to be able to maintain the display performance even if it is bent like paper by using a flexible material such as plastic instead of the conventional glass substrate having no flexibility is rapidly emerging as a next generation flat panel display device.

The flexible display device utilizes a non-glass plastic thin film transistor substrate to provide a durable, unbreakable, bendable, bendable, rollable, Foldable, etc. Such a flexible display device has advantages of space utilization, interior and design, and can have various application fields.

In recent years, in order to realize large size, light weight, small size, and large size, a foldable display device capable of being folded in a folded state and displaying an image in an unfolded state has been actively studied.

The folder-type display device can be applied not only to mobile devices such as a mobile phone, an ultra mobile PC, an electronic book, and an electronic newspaper, but also to various fields such as a TV and a monitor.

Such a foldable display device includes a display panel for largely implementing an image, a back plate for supporting the display panel at a lower portion of the display panel, and a cover window disposed in front of the display panel for protecting the display panel. and a cover window.

Here, an optical adhesive layer is interposed between the display panel, the cover window, the display panel and the back plate, and the display panel, the cover window and the back plate are integrally bonded and modularized with each other.

At this time, the optical adhesive layer applied to the display device of the foldable type is formed of OCA (Optical Cleared Adhesive). When the optical adhesive layer has a low modulus, the optical adhesive layer is limited in the folding and spreading of the display device However, a separate mid-frame is required, which causes a problem that a physical boundary between the folded area and the unfolded area of the display device is visually recognized. Which eventually deteriorates the display quality of the display panel.

In addition, when the optical adhesive layer has a high modulus, restrictions are imposed on the folding and unfolding of the display device, and bending stress is caused to cause damage to the display panel such as peeling of the thin film layer.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a foldable display device having no limitations in folding and unfolding and having improved durability.

A second object of the present invention is to prevent deterioration of the display quality of the display panel and to prevent the display panel from being damaged.

In order to achieve the above object, the present invention provides a display device comprising: a display panel; A cover window positioned in front of the display panel; A back plate positioned behind the display panel; A first optical adhesive layer positioned between the display panel and the cover window, and a second optical adhesive layer positioned between the display panel and the back plate, wherein the adhesive layer comprises at least one of the first and second optical adhesive layers And a emboss pattern is formed on the surface.

The first and second optical adhesive layers each include a base film and first and second adhesive layers on both sides of the base film, and the emboss pattern is formed on at least one surface of the first and second adhesive layers And the embossed pattern has a size of 10 ² to 10 ³ μm.

The first and second optical adhesive layers are defined by being divided into a folded area and a non-folded area, the size of the embossed pattern in the folded area is larger than the size of the embossed pattern in the unfolded area, A black ink layer is interposed between the base film of the optical adhesive layer and the second adhesive layer.

According to another aspect of the present invention, there is provided a semiconductor device comprising: a base film; a first adhesive layer located on one side of the base film and having an emboss pattern on the surface; And a second adhesive layer positioned on the other surface of the base film.

At this time, a black ink layer is positioned between the base film and the second adhesive layer.

As described above, according to the present invention, the cover window, the touch panel, the display panel, and the back plate are attached to and integrated with each other through the optical adhesive layer in the form of a double-sided tape having an embossed pattern formed on the surface of the adhesive layer, It is possible to improve the durability of the display device itself without limitation by the optical adhesive layer.

Accordingly, it is possible to prevent the problem that the physical boundary between the folded area and the non-folded area of the foldable display device by the midframe is visually recognized, by avoiding the need for a separate midframe, The display quality can be prevented from deteriorating.

Also, there is an effect that the display panel such as peeling of the thin film can be prevented from being damaged due to bending stress.

In addition, by attaching the back plate to the back surface of the OLED panel through the optical adhesive layer including the black ink layer, the effect of improving the black color of the display device can be realized.

Further, due to the different material of the back plate, there is a problem that the physical boundary between the folded area and the non-folded area is visually recognized on the upper part of the display panel due to physical step difference or other pressing characteristics of the folded area and the non- It is possible to prevent the display quality of the display panel from being deteriorated even through this.

In addition, when the back plate is made of a metal material, external light reflected from the back plate can be blocked, thereby improving the display quality of the display panel.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view schematically showing a folderable display device according to an embodiment of the present invention; Fig.
Fig. 2 is a cross-sectional view schematically showing the display panel of Fig. 1; Fig.
FIG. 3A is a cross-sectional view schematically showing an optical adhesive layer according to the first embodiment of the present invention. FIG.
3B and 3C are photographs showing embossed patterns on the surface of the adhesive layer.
4 is a cross-sectional view schematically showing an optical adhesive layer according to a second embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view schematically showing a foldable display device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing the display panel of FIG.

As shown in the figure, the display device 100 includes a display panel 110 for realizing an image, a touch panel 120 for forming a touch sensor (not shown), and a back plate 120 for supporting the display panel 110. [ a back plate 130, and a cover window 140 for protecting the display panel 110.

For the sake of convenience of description, if the direction of the drawing is defined, the back plate 130 is positioned at the back of the display panel 110, assuming that the display surface of the display panel 110 faces forward, The cover window 140 is located in front of the cover window 140.

The touch panel 120 is positioned between the display panel 110 and the cover window 140.

Here, the display panel 110 may be a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) Electroluminescence Display Device (ELD), and Organic Light Emitting Diodes (OLED). It is possible to use OLED, which is a representative of a flexible display device capable of maintaining display performance even when bent like paper desirable.

The OLED is a self-luminous element and can be lightweight and thin because a backlight used in a liquid crystal display device which is a non-luminous element is not required.

In addition, it has a better viewing angle and contrast ratio than liquid crystal display devices, is advantageous in terms of power consumption, can be driven by DC low voltage, has a fast response speed, is resistant to external impacts due to its solid internal components, It has advantages.

Particularly, since the manufacturing process is simple, it is advantageous in that the production cost can be saved more than the conventional liquid crystal display device.

The display panel 110 including the OLED is encapsulated with a protective film 102 on a substrate 101 on which a driving thin film transistor DTr and a light emitting diode E are formed.

Here, the display panel 110 (hereinafter referred to as an OLED panel) comprising an OLED will be described in detail with reference to FIG.

A semiconductor layer 104 is formed on the pixel region P on the substrate 101. The semiconductor layer 104 is made of silicon and has a central portion formed on both sides of the active region 104a and the active region 104a, Doped source and drain regions 104b and 104c.

A gate insulating layer 105 is formed on the semiconductor layer 104.

On the gate insulating film 105, gate electrodes 107 corresponding to the active regions 104a of the semiconductor layer 104 and gate wirings extending in one direction, though not shown in the figure, are formed.

A first interlayer insulating film 106a and a gate insulating film 105 under the first interlayer insulating film 106a are formed on the entire upper surface of the gate electrode 107 and the gate wiring (not shown) And first and second semiconductor layer contact holes 109 exposing the source and drain regions 104b and 104c, respectively, located on both sides of the semiconductor layer 104a.

Next, on the first interlayer insulating film 106a including the first and second semiconductor layer contact holes 109, source and drain regions (the first and second semiconductor layer contact holes 109, Source and drain electrodes 108a and 108b which are in contact with the source and drain electrodes 104a and 104b and 104c are formed.

The second interlayer insulating film 106b having the drain contact hole 112 exposing the drain electrode 108b over the first interlayer insulating film 106a exposed between the source and drain electrodes 108a and 108b and the two electrodes 108a and 108b, An insulating film 106b is formed.

At this time, the semiconductor layer 104 including the source and drain electrodes 108a and 108b and the source and drain regions 104b and 104c contacting the electrodes 108a and 108b and the gate insulating film 104 formed on the semiconductor layer 104 The gate electrode 105 and the gate electrode 107 constitute a driving thin film transistor DTr.

On the other hand, although not shown in the figure, data lines (not shown) for defining the pixel regions P intersect the gate lines (not shown) are formed. The switching thin film transistor (not shown) has the same structure as the driving thin film transistor DTr and is connected to the driving thin film transistor DTr.

In the drawings, the switching thin film transistor (not shown) and the driving thin film transistor DTr are shown as an example of a co-planar type in which the semiconductor layer 104 is a polysilicon semiconductor layer. As a variation thereof, And a bottom gate type of impurity amorphous silicon.

In addition, a portion of the second interlayer insulating film 106b, which substantially displays an image, has a relatively high work function value, for example, as a constituent element of the anode (anode) One electrode 111 is formed.

The first electrode 111 is connected to the drain electrode 108b of the driving thin film transistor DTr

The first electrode 111 is formed for each pixel region P and a bank 119 is located between the first electrodes 111 formed for each pixel region P. [

That is, the first electrode 111 is formed in a structure in which the bank 119 is divided into the pixel regions P with the boundary portion for each pixel region P being separated.

An organic light emitting layer 113 is formed on the first electrode 111.

Here, the organic light emitting layer 113 may be a single layer made of a light emitting material. In order to increase the light emitting efficiency, a hole injection layer, a hole transport layer, an emitting material layer, An electron transport layer, and an electron injection layer.

In general, the organic light emitting layer 113 displays red (R), green (G), and blue (B) colors. And organic materials 113a, 113b, and 113c that emit light of a different color (B) are used in a pattern.

A second electrode 115, which forms a cathode, is formed on the entire surface of the organic light emitting layer 113.

At this time, the second electrode 115 has a bilayer structure and includes a semitransparent metal film in which a metal material having a low work function is thinly deposited. In this case, the second electrode 115 may be a two-layer structure in which a transparent conductive material is thickly deposited on the semitransparent metal film.

Therefore, the light emitted from the organic light emitting layer 113 is driven to the top emission type, which is emitted toward the second electrode 115.

Or the second electrode 115 may be an opaque metal film and the light emitted from the organic light emitting layer 113 may be driven to a bottom emission type that is emitted toward the first electrode 111. [

When a predetermined voltage is applied to the first electrode 111 and the second electrode 115 according to a selected color signal, the OLED panel 110 emits a positive voltage, which is injected from the first electrode 111, The excitons are transported to the organic light emitting layer 113 to form excitons. When the excitons are transited from the excited state to the ground state, light is emitted and emitted in the form of visible light.

At this time, the emitted light passes through the transparent second electrode 115 or the first electrode 111 and exits to the outside, so that the OLED panel 110 realizes an arbitrary image.

A protective film 102 in the form of a thin film is formed on the driving thin film transistor DTr and the light emitting diode E so that the OLED panel 101 is encapsulated through the protective film 102, At least two inorganic protective films 102a are laminated on the protective film 102 to prevent external oxygen and moisture from penetrating into the OLED panel 110. In this case, It is preferable that an organic protective film 102b for compensating the impact resistance of the inorganic protective film 102a is interposed.

On the other hand, the substrate 101 may be made of a thin polyimide in order to have a flexible property. The substrate 101 made of such a thin polyimide is not suitable for the process of forming a component such as the thin film transistor DTr Therefore, the process of forming the constituent elements such as the thin film transistor DTr proceeds in a state in which a substrate made of polyimide is attached to a carrier substrate such as a glass substrate. Thereafter, the OLED panel 110 can be obtained by separating the carrier substrate from the polyimide substrate.

The OLED panel 110 and the touch panel 120 are attached to each other through an adhesive layer (not shown) of the touch panel 110. [

Although not shown in detail, the touch panel 120 includes a first touch film (not shown) having a first touch electrode (not shown) and a second touch film (not shown) having a second touch electrode They are spaced apart from each other.

The first touch electrode (not shown) is deposited on the entire surface of the first touch film (not shown), and the first touch electrode (not shown) is formed of indium tin oxide (ITO) or indium- (IZO).

A second touch electrode (not shown) is formed on the second touch film (not shown) facing the first touch film (not shown) (AlNd), magnesium (Mg), gold (Au), silver (Ag) or the like.

The first and second touch electrodes (not shown) form a touch sensor (not shown).

Accordingly, when the upper portion of the first touch film (not shown) is brought into contact with a point by a predetermined input means such as a finger or a pen, a first touch electrode (not shown) formed on the first touch film A second touch electrode (not shown) formed on a two-touch film (not shown) is mutually energized, a voltage value changed by the resistance value at that position is read, and then the position coordinate can be found in accordance with the variation of the potential difference in the control device .

The OLED panel 110 attached to the touch panel 120 is integrally modulated through the cover window 140 and the back plate 130. The touch panel 120 is disposed in front of the OLED panel 110, And a cover window 140 for protecting the OLED panel 110 is attached through a first optical adhesive layer 150 and a back plate for supporting the OLED panel 110 is formed on the back surface of the OLED panel 110 130 are attached through the second optical adhesive layer 160.

Here, the first and second optical adhesive layers 150 and 160 are provided on both surfaces of the base film 201 (see FIG. 3A) and the double-sided tape (adhesive tape) The foldable display device 100 according to the embodiment of the present invention is characterized in that the surface of the adhesive layers 210 and 220 (see FIG. 3A) has an emboss pattern 230 (see FIG. 3A) .

Accordingly, the present invention can improve the durability of the display device 100 and prevent the degradation of the OLED panel 110 or degradation of the display quality. Let's take a closer look at this later.

The cover window 140 protects the OLED panel 110 and the touch panel 120 from external impact and transmits light emitted from the OLED panel 110 so that the image displayed on the OLED panel 110 is viewed from the outside. do.

The cover window 140 may be made of a polymeric material such as polymethylmethacrylate (PMMA), polycarbonate (PC), cycloolefin polymer (COP), polyethylene terephthalate terephthalate (PET), polyimide (PI), and polyaramid (PA).

The back plate 130 is attached to the back surface of the OLED panel 110 in order to support the OLED panel 110 because the substrate 101 of the OLED panel 110 is too thin and a metal material such as stainless steel But are not limited to, polymethyl methacrylate (PMMA), polycarbonate (PC), polyvinyl alcohol (PVA), acrylonitrile-butadiene-styrene (ABS) And may be made of a polymer such as polyethylene terephthalate (PET).

As described above, the display device 100 according to the embodiment of the present invention includes the cover window 140, the touch panel 120, the OLED panel 110, and the back plate 130 to the adhesive layers 210, 220, (See FIG. 3A) and the optical adhesive layers 150 and 160 having a double-sided tape shape in which an emboss pattern 230 (see FIG. 3A) is formed on the surface thereof, the durability of the display device 100 is improved It is possible to prevent a problem that the OLED panel 110 is damaged or the display quality is deteriorated.

FIG. 3A is a cross-sectional view schematically showing an optical adhesive layer according to a first embodiment of the present invention, and FIGS. 3B and 3C are photographs showing embossed patterns on the surface of an adhesive layer.

3A, the optical adhesive layers 150 and 160 include a base film 201 and first and second adhesive layers 210 and 220 located on both sides of the base film 201, A first protective film 240 is attached to the top of the adhesive layer 210 and a second protective film 250 is attached to the bottom of the second adhesive layer 220.

An emboss pattern 230 is formed on the surface of the first adhesive layer 210.

Here, the first and second protective films 240 and 250 may be formed by attaching a cover window (140 in FIG. 1) to the upper portion of the touch panel (120 in FIG. 1) Is removed in the process of attaching the back plate (130 in FIG. 1).

The optical adhesive layers 150 and 160 are folded and folded in a foldable display device (100 in FIG. 1) due to the emboss pattern 230 formed on the surface of the first adhesive layer 210, The durability is improved without limitation.

Accordingly, it is possible to prevent the problem that the physical boundary between the folded area and the non-folded area of the foldable display device (100 of FIG. 1) by the midframe is visually recognized, by not requiring a separate midframe have.

That is, the foldable display device (100 in Fig. 1) is provided with a folded area which is an area where folding is performed so as to form a curvature at the time of folding and a folded area where both sides of the folded area are flat even when the foldable display device Folded area, where the midframe is located corresponding to the unfolded area and is not located corresponding to the folded area.

Therefore, the physical boundary between the folded region and the non-folded region is visually recognized by the midframe. However, the foldable display apparatus (100 of FIG. 1) according to the embodiment of the present invention is improved in durability itself, It is possible to prevent the problem that the physical boundary between the folded region and the non-folded region due to the midframe is visually recognized.

As a result, the display quality of the OLED panel (110 in FIG. 1) can be prevented from deteriorating.

In addition, it is possible to prevent damage to the OLED panel (110 in FIG. 1) such as peeling of the thin film due to bending stress.

Here, the emboss pattern 230 may be formed to have various sizes as shown in FIG. 3B and FIG. 3C, preferably in the range of 10 ² to 10 ³ μm.

This is because the emboss pattern 230 of 10 ² μm or less is difficult to serve as the emboss pattern 230 on the surface of the first adhesive layer 210 of the optical adhesive layers 150 and 160.

When the emboss pattern 230 of 10 ³ um or more is formed on the surface of the first adhesive layer 210 of the optical adhesive layers 150 and 160, the surface of the first adhesive layer 210 of the optical adhesive layers 150 and 160 It is difficult to serve as the emboss pattern 230.

Here, the optical adhesive layers 150 and 160 can be defined as a folded area and a non-folded area. In the folded area of the optical adhesive layer 150, the size of the embossed pattern 230 on the surface of the first adhesive layer 210 is unfolded Can be formed larger than the size of the emboss pattern 230 of the area.

3B is an emboss pattern 230 on the surface of the first adhesive layer 210 in the folding region and FIG. 3C is an emboss pattern 230 on the surface of the first adhesive layer 210 in the folding region.

As a result, it is possible to maximize the elongation of the optical adhesive layers 150 and 160 in the folding region, so that the folding and unfolding of the foldable display device 100 (Fig. 1) can be prevented from being further restricted, The elastic force of the optical adhesive layers 150 and 160 can be increased by the emboss pattern 230 having a small size. This also makes it possible to further improve the durability of the display device (100 of FIG. 1) of the display device.

The optical adhesive layers 150 and 160 may be formed by coating first and second adhesive powders (not shown) on both sides of the base film 201 and then bonding the first and second adhesive powders The embossed pattern 230 formed on the surface of the first adhesive layer 210 is formed by laminating the first adhesive powder 210 and the second adhesive powder 240 on the surface of the first adhesive layer 210, (Not shown) formed on one surface of the first protective film 240 adhered to the first adhesive film (not shown) is transferred to the first adhesive powder (not shown) during the laminating process.

As described above, the optical adhesive layers 150 and 160 according to the embodiment of the present invention are formed by forming the emboss pattern 230 on the surface of the first adhesive layer 210 so that the optical adhesive layers 150 and 160, The durability of itself becomes improved.

1), the touch panel (120 in FIG. 1), the OLED panel (110 in FIG. 1), and the touch panel When the back plate (130 in Fig. 1) is integrally attached, there is no restriction by the optical adhesive layers 150 and 160 in folding and unfolding of the display device (100 in Fig. 1) 1 of 100) itself is also improved durability.

Accordingly, it is possible to prevent the problem that the physical boundary between the folded area and the non-folded area of the foldable display device (100 of FIG. 1) by the midframe is visually recognized, by not requiring a separate midframe have. Therefore, it is also possible to prevent degradation of the display quality of the OLED panel (110 in FIG. 1).

In addition, it is possible to prevent damage to the OLED panel (110 in FIG. 1) such as peeling of the thin film due to bending stress.

4 is a cross-sectional view schematically showing an optical adhesive layer according to a second embodiment of the present invention.

The optical adhesive layer 160 includes a base film 201 and first and second adhesive layers 210 and 220 located on both sides of the base film 201. The optical adhesive layer 160 includes a first adhesive layer 210, And a second protective film 250 is attached to a lower portion of the second adhesive layer 220. [

An emboss pattern 230 is formed on the surface of the first adhesive layer 210.

Here, the first and second protective films 240 and 250 may be formed by attaching a cover window (140 in FIG. 1) to the upper portion of the touch panel (120 in FIG. 1) Is removed in the process of attaching the back plate (130 in FIG. 1).

In particular, the optical adhesive layer 160 according to the second embodiment of the present invention is characterized in that a black ink layer 260 is further interposed between the base film 201 and the second adhesive layer 220.

The optical adhesive layer 160 preferably serves to attach the back plate 130 of FIG. 1 to the back surface of the OLED panel 110 (FIG. 1). The back surface of the OLED panel 110 (130 in FIG. 1) is attached to the optical adhesive layer 160 including the black ink layer 260, the effect of improving the black color of the display device (100 in FIG. 1) can be realized.

Further, in order to minimize the plastic deformation of the back plate (130 in FIG. 1), the back plate (130 in FIG. 1) is defined as a folded area and a non-folded area and is made of a soft material corresponding to the folded area (110 in Fig. 1) due to the physical step difference or the different pressing characteristics of the folded region and the non-folded region due to the different materials, It is possible to prevent a problem that a physical boundary between the folded region and the non-folded region is visually recognized.

Therefore, it is also possible to prevent degradation of the display quality of the OLED panel (110 in FIG. 1).

In addition, when the back plate (130 in FIG. 1) is made of a metal material, external light reflected from the back plate (130 in FIG. 1) can be blocked and the display quality of the OLED panel .

The durability of the optical adhesive layer 160 is improved by the emboss pattern 230 formed on the surface of the first adhesive layer 210 and the durability of the optical adhesive layer 160 is further improved by the base film 201 and the black ink layer 260 do.

Accordingly, such an optical adhesive layer 160 may be attached to the back surface of the OLED panel 110 (FIG. 1) such that the optical adhesive layer 160 takes the role of a back plate (130 in FIG. 1). 1) can be formed by eliminating the back plate (130 in FIG. 1), and it is possible to reduce the process cost or to prevent the back plate 130) can be removed, and the efficiency of the process can be improved.

1) of the cover window (140 in FIG. 1), the touch panel (120 in FIG. 1), the OLED panel (110 in FIG. 1) 1) by attaching and integrating the back plate 130 of FIG. 1 through the adhesive layer 160 having the double-sided tape shape with the emboss pattern 230 formed on the surface of the adhesive layers 210 and 220, The durability of the self-centering display device (100 of FIG. 1) itself is improved without any restriction by the optical adhesive layer 160 in the folding and unfolding of the foldable display device.

Accordingly, it is possible to prevent the problem that the physical boundary between the folded area and the non-folded area of the foldable display device (100 of FIG. 1) by the midframe is visually recognized, by not requiring a separate midframe have. Therefore, it is also possible to prevent degradation of the display quality of the OLED panel (110 in FIG. 1).

In addition, it is possible to prevent damage to the OLED panel (110 in FIG. 1) such as peeling of the thin film due to bending stress.

Further, by attaching the back plate (130 in FIG. 1) through the optical adhesive layer 160 including the black ink layer 260 to the back surface of the OLED panel (110 in FIG. 1) ) Can be realized.

1) due to the different material of the back plate (130 in FIG. 1) due to the physical step difference or other pressing characteristics of the folded region and the non-folded region, It is possible to prevent the occurrence of a problem that the physical boundary of the display device is visually recognized.

Therefore, it is also possible to prevent degradation of the display quality of the OLED panel (110 in FIG. 1).

In addition, when the back plate (130 in FIG. 1) is made of a metal material, external light reflected from the back plate (130 in FIG. 1) can be blocked and the display quality of the OLED panel .

Although the optical adhesive layer 160 according to the embodiment of the present invention has been shown and described to have the emboss pattern 230 formed on the surface of the first adhesive layer 210, May be formed on the surface of the second adhesive layer 220 together with the surface, or may be formed only on the surface of the second adhesive layer 220.

In the above description, the touch panel (120 in FIG. 1) is positioned above the OLED panel 110 (FIG. 1) in which an image is implemented in the display device , The touch panel (120 in Fig. 1) can be deleted.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

150, 160: Optical adhesive layer
201: substrate film
210, 220: first and second adhesive layers
230: emboss pattern
240, 250: first and second protective films

Claims (7)

A display panel;
A cover window positioned in front of the display panel;
A back plate positioned behind the display panel;
A first optical adhesive layer positioned between the display panel and the cover window, and a second optical adhesive layer positioned between the display panel and the backplate,
And an emboss pattern is formed on a surface of the adhesive layer included in at least one of the first and second optical adhesive layers.
The method according to claim 1,
Wherein the first and second optical adhesive layers each comprise a base film and first and second adhesive layers on both sides of the base film, wherein the emboss pattern is formed on at least one surface of the first and second adhesive layers, Lt; / RTI >
The method according to claim 1,
Wherein the emboss pattern has a size of 10 ² to 10 ³ μm.
The method of claim 3,
Wherein the first and second optical adhesive layers are divided into a folded area and a non-folded area, respectively, and the size of the embossed pattern in the folded area is larger than the size of the embossed pattern in the unfolded area.
3. The method of claim 2,
Wherein a black ink layer is interposed between the base film of the second optical adhesive layer and the second adhesive layer.
A base film,
A first adhesive layer located on one side of the base film and having an emboss pattern on the surface;
The second adhesive layer located on the other surface of the base film
And an optical adhesive layer for a display device.
The method according to claim 6,
And a black ink layer is disposed between the base film and the second adhesive layer.

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