KR102361850B1 - Display Device - Google Patents

Abstract

The display device of the present invention includes a display panel for displaying an image, a cover unit under the display panel, a gap maintaining member between the display panel and the cover unit, and an adhesive positioned outside the gap maintaining member and bonding the display panel and the cover unit a member, wherein the adhesive member includes a first adhesive part and a second adhesive part outside the first adhesive part, wherein the storage modulus of the first adhesive part is smaller than that of the second adhesive part, and the elongation of the first adhesive part is greater than that of the second adhesive part; The strength of the second bonding portion is greater than that of the first bonding portion. Accordingly, by alleviating the curvature of the display panel and the cover unit by the first adhesive part, peeling of the adhesive member can be prevented, and external pressure or scratches can be prevented by the second adhesive part, and when coating failure occurs, the display panel and the separation process of the cover unit can be facilitated.
In addition, since the first adhesive part implements a specific color by including a pigment or dye, it is possible to provide a display device having various designs.

Description

Display Device

The present invention relates to a display device, and more particularly, to a display device having a narrow bezel.

In line with the information age, the display field has also developed rapidly, and in response to this, a liquid crystal display device (LCD) as a flat panel display device (FPD) with the advantages of thinness, light weight, and low power consumption. ) and an electroluminescent display device (ELD) have been developed and widely applied.

Such flat panel display devices are widely used in portable devices such as smart phones, computer monitors, or televisions, and the display panel of each flat panel display device is modularized through various devices such as cases or covers, and is manufactured and supplied. .

In this case, the display panel of the flat panel display includes a display area for displaying an image and a non-display area surrounding the display area, and a case or cover positioned on the front surface of the display panel covers the non-display area. Here, a portion of the case or cover covering the non-display area becomes a bezel area of the product.

The bezel area is an area where no image is displayed, increasing the size of the product and deteriorating the appearance of the product.

Therefore, in recent years, by omitting or minimizing devices such as a case, the thickness and weight are reduced, the bezel area is reduced, and the size of the display area is maximized in a display device of the same size, thereby borderless having a neat appearance without exposing the device. (borderless) products are being researched and developed.

To this end, a structure in which an adhesive tape is applied between a display panel and a device supporting the display panel has been proposed, and the adhesive tape fixes the display panel on the device by a strong adhesive force.

However, when adhesion failure occurs, the display panel and the device must be separated, and separate equipment is required for separation, which increases the cost. In addition, it is difficult to separate the display panel and the device due to the strong adhesive force of the adhesive tape, and there is a problem in that the display panel and the like are damaged in the process of separating the display panel and the device. Accordingly, the display device having poor adhesion cannot be recycled, thereby reducing productivity and increasing cost.

The present invention has been proposed to solve the above problems, and aims to solve the problems of decreased productivity and increased cost due to poor adhesion of a display device.

In order to achieve the above object, a display device of the present invention includes a display panel for displaying an image, a cover unit under the display panel, a gap maintaining member between the display panel and the cover unit, and a display positioned outside the gap maintaining member. and an adhesive member for bonding the panel and the cover unit, wherein the adhesive member includes a first adhesive part and a second adhesive part outside the first adhesive part.

In this case, the storage modulus of the first adhesive part is smaller than that of the second adhesive part, the elongation of the first adhesive part is greater than that of the second adhesive part, and the strength of the second adhesive part is greater than that of the first adhesive part.

In addition, the first adhesive part may include a pigment or dye, and the second adhesive part is transparent.

In the present invention, the weight and thickness of the display device can be reduced by fixing the display panel to the fixture using an adhesive member.

In addition, it is possible to differentiate the design by reducing the bezel area and implementing a borderless structure.

In addition, since the adhesive member of the present invention is made of an adhesive resin, the cost can be reduced compared to the conventional method using an adhesive tape, and by applying the adhesive member to the exterior of the display device without a separate component, it is light and thin and differentiated from the conventional one Excellent design can be implemented.

In addition, in the present invention, when adhesion failure occurs, the display panel can be easily separated from the appliance without damage, and thus productivity can be increased and costs can be reduced by recycling the display panel and the appliance.

1 is a cross-sectional view schematically illustrating a display device according to an exemplary embodiment of the present invention.
2 is a plan view schematically illustrating a display device according to an exemplary embodiment of the present invention.
3A and 3B are schematic cross-sectional views illustrating examples of a display panel of a display device according to an exemplary embodiment of the present invention.
4A to 4F are cross-sectional views schematically illustrating a manufacturing process of a display device according to an exemplary embodiment of the present invention.
5A to 5C are cross-sectional views schematically illustrating a display device according to other exemplary embodiments.

A display device according to an embodiment of the present invention includes a display panel for displaying an image, a cover unit under the display panel, a gap maintaining member between the display panel and the cover unit, and the gap maintaining member positioned outside the gap maintaining member. and an adhesive member bonding the display panel to the cover unit, wherein the adhesive member includes a first adhesive part and a second adhesive part outside the first adhesive part.

The storage modulus of the first adhesive part is smaller than that of the second adhesive part.

The elongation of the first adhesive part is greater than that of the second adhesive part.

The strength of the second adhesive part is greater than that of the first adhesive part.

The first adhesive part includes a pigment or dye, and the second adhesive part is transparent.

The second adhesive part is thicker than the first adhesive part.

The first adhesive part contacts a lower surface of the display panel and an upper surface of the cover unit.

The second adhesive part contacts a side surface of the display panel and an upper surface of the cover unit.

A side sealing part is formed on a side surface of the display panel, and the first adhesive part is spaced apart from the side sealing part or overlaps a part of the side sealing part.

Hereinafter, a display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically illustrating a display device according to an embodiment of the present invention, and FIG. 2 is a plan view schematically illustrating a display device according to an embodiment of the present invention.

1 and 2 , a display device according to an embodiment of the present invention includes a display panel 110 , a cover unit 120 positioned on a rear surface of the display panel 110 , and a display panel a gap maintaining member 130 between the 110 and the cover unit 120 , and an adhesive member 140 outside the gap maintaining member 130 .

The display panel 110 includes a plurality of pixels and displays an image through the front surface. For example, the display panel 110 may be an electroluminescent display panel including a light emitting diode or a liquid crystal display panel including a liquid crystal capacitor, but is not limited thereto.

The display panel 110 will be described in more detail with reference to FIGS. 3A and 3B . 3A and 3B are schematic cross-sectional views illustrating an example of a display panel of a display device according to an embodiment of the present invention, illustrating one pixel area.

First, as shown in FIG. 3A , the display panel 110 of the present invention may be an electroluminescent display panel.

That is, the display panel 110 includes a substrate 150 , a thin film transistor Tr positioned on the substrate 150 , a light emitting diode D connected to the thin film transistor Tr, and the light emitting diode ( D) may include an encapsulation film 190 covering the.

In more detail, a semiconductor layer 154 is formed on the substrate 150 . The substrate 150 may be made of glass or plastic, and may have flexibility. A buffer layer (not shown) may be formed between the substrate 150 and the semiconductor layer 154 , and the buffer layer may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

Meanwhile, the semiconductor layer 154 may be made of an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer 154 is made of an oxide semiconductor material, a light blocking pattern (not shown) may be formed under the semiconductor layer 154 , and the light blocking pattern prevents light from entering the semiconductor layer 154 . Thus, the semiconductor layer 154 is prevented from being deteriorated by light. Alternatively, the semiconductor layer 154 may be made of polycrystalline silicon, and in this case, both edges of the semiconductor layer 154 may be doped with impurities.

A gate insulating layer 156 made of an insulating material is formed on the semiconductor layer 154 . The gate insulating layer 156 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 160 made of a conductive material such as metal is formed on the gate insulating layer 156 to correspond to the center of the semiconductor layer 154 .

In FIG. 3A , the gate insulating layer 156 is formed on the entire surface of the substrate 150 , but the gate insulating layer 156 may be patterned to have the same shape as the gate electrode 160 .

An interlayer insulating layer 162 made of an insulating material is formed on the gate electrode 160 . The interlayer insulating layer 162 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride, or an organic insulating material such as benzocyclobutene or photo-acryl.

The interlayer insulating layer 162 has first and second contact holes 164 and 166 exposing both sides of the semiconductor layer 154 . The first and second contact holes 164 and 166 are positioned at both sides of the gate electrode 160 to be spaced apart from the gate electrode 160 .

Here, the first and second contact holes 164 and 166 are also formed in the gate insulating layer 166 . Alternatively, when the gate insulating layer 166 is patterned to have the same shape as the gate electrode 160 , the first and second contact holes 164 and 166 may be formed only in the interlayer insulating layer 162 .

A source electrode 170 and a drain electrode 172 made of a conductive material such as metal are formed on the interlayer insulating layer 162 .

The source electrode 170 and the drain electrode 172 are spaced apart from the gate electrode 160 at the center, and both sides of the semiconductor layer 154 through the first and second contact holes 164 and 166, respectively. come in contact with

The semiconductor layer 154, the gate electrode 160, the source electrode 170, and the drain electrode 172 form the thin film transistor Tr, and the thin film transistor Tr is a driving element. ) functions as

The thin film transistor Tr has a coplanar structure in which the gate electrode 160 , the source electrode 170 , and the drain electrode 172 are positioned on the semiconductor layer 154 .

Alternatively, the thin film transistor Tr may have an inverted staggered structure in which a gate electrode is positioned under a semiconductor layer and a source electrode and a drain electrode are positioned above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon.

Although not shown, a gate line and a data line cross each other to define a pixel area, and a switching element connected to the gate line and the data line is further formed. The switching element is connected to a thin film transistor Tr as a driving element.

In addition, a power line is formed to be spaced apart from the gate line or the data line in parallel, and a storage capacitor for maintaining a constant voltage of the gate electrode of the thin film transistor Tr, which is a driving element, during one frame is further provided. can be configured.

A protective layer 174 having a drain contact hole 176 exposing the drain electrode 172 of the thin film transistor Tr is formed to cover the thin film transistor Tr.

A first electrode 180 connected to the drain electrode 172 of the thin film transistor Tr through the drain contact hole 176 is formed on the passivation layer 174 to be separated for each pixel area. The first electrode 180 may be an anode, and may be made of a conductive material having a relatively large work function value. For example, the first electrode 170 may be made of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO). .

Meanwhile, when the display panel 110 of the present invention is a top-emission type electroluminescence display panel, a reflective electrode or a reflective layer may be further formed under the first electrode 170 . For example, the reflective electrode or the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy.

In addition, a bank layer 186 covering an edge of the first electrode 180 is formed on the passivation layer 174 . The bank layer 186 exposes the center of the first electrode 180 corresponding to the pixel area.

A light emitting layer 182 is formed on the first electrode 180 . The light emitting layer 182 may have a single layer structure of a light emitting material layer made of a light emitting material. Alternatively, in order to increase light emission efficiency, the light emitting layer 182 may have a multilayer structure, for example, a hole injection layer and a hole transport layer sequentially stacked on the first electrode 180 . It may include a transporting layer, a light emitting material layer, an electron transporting layer, and an electron injection layer. Here, the light emitting material of the light emitting material layer may be an organic light emitting material or an inorganic light emitting material such as quantum dots.

A second electrode 184 is formed on the substrate 150 on which the light emitting layer 182 is formed. The second electrode 184 is located on the entire surface of the display area and is made of a conductive material having a relatively small work function value and may be used as a cathode. For example, the second electrode 184 may be formed of any one of aluminum (Al), magnesium (Mg), and an aluminum-magnesium alloy (AlMg).

The first electrode 180 , the light emitting layer 182 , and the second electrode 184 form a light emitting diode D .

An encapsulation film 190 is formed on the second electrode 184 to prevent external moisture from penetrating into the light emitting diode D. The encapsulation film 190 may have a stacked structure of a first inorganic insulating layer 192 , an organic insulating layer 194 , and a second inorganic insulating layer 196 , but is not limited thereto.

In addition, when the display panel 110 of the present invention is a top emission type electroluminescent display panel, a polarizing plate (not shown) for reducing external light reflection may be attached on the encapsulation film 190 . For example, the polarizing plate may be a circular polarizing plate.

Meanwhile, as shown in FIG. 3B , the display panel 110 of the present invention may be a liquid crystal display panel.

That is, the display panel 110 includes first and second substrates 210 and 250 facing each other, and liquid crystal interposed between the first and second substrates 210 and 250 and including liquid crystal molecules 262 . It includes a layer 260 , and first and second polarizing plates 272 and 274 may be disposed on outer surfaces of the first and second substrates 210 and 250 , respectively.

The first substrate 210 may be made of glass or plastic, and may have flexibility. In addition, a buffer layer (not shown) may be further formed on the first substrate 210 .

A gate electrode 222 is formed on the first substrate 210 , and a gate insulating layer 224 is formed to cover the gate electrode 222 . Also, a gate line (not shown) connected to the gate electrode 222 is formed on the first substrate 110 .

A semiconductor layer 226 is formed on the gate insulating layer 224 to correspond to the gate electrode 222 . The semiconductor layer 226 may be formed of an oxide semiconductor material. Meanwhile, the semiconductor layer 226 may include an active layer made of amorphous silicon and an ohmic contact layer made of impurity amorphous silicon.

A source electrode 230 and a drain electrode 232 spaced apart from each other are formed on the semiconductor layer 226 . Also, a data line (not shown) connected to the source electrode 230 crosses the gate line and defines a pixel area.

The gate electrode 222 , the semiconductor layer 226 , the source electrode 230 , and the drain electrode 232 constitute a thin film transistor Tr.

A protective layer 234 having a drain contact hole 236 exposing the drain electrode 232 is formed on the thin film transistor Tr.

A pixel electrode 240 connected to the drain electrode 232 through the drain contact hole 236 and a common electrode 242 alternately arranged with the pixel electrode 240 are formed on the passivation layer 234 . is formed

A black matrix 254 is formed on the second substrate 250 to cover non-display areas such as the thin film transistor Tr, the gate wiring, and the data wiring. In addition, a color filter layer 256 is formed corresponding to the pixel area. A buffer layer (not shown) may be further formed between the second substrate 250 and the color filter layer 256 .

The first and second substrates 210 and 250 are bonded to each other with a liquid crystal layer 260 interposed therebetween, and the liquid crystal layer 260 is generated by an electric field generated between the pixel electrode 240 and the common electrode 242 . ) of the liquid crystal molecules 262 are driven. The pixel electrode 240 , the common electrode 242 , and the liquid crystal layer 260 form a liquid crystal capacitor, and the liquid crystal capacitor is connected to the thin film transistor Tr.

Although not shown, an alignment layer may be formed on each of the first and second substrates 210 and 250 in contact with the liquid crystal layer 260 .

On the other hand, first and second polarizing plates 272 and 274 for transmitting only linearly polarized light in a specific direction are attached to the outer surfaces of the first and second substrates 210 and 250, respectively, and the light transmission axis of the first polarizing plate 272 is the second 2 is disposed perpendicular to the light transmission axis of the polarizing plate 274 .

Here, the common electrode 242 is alternately arranged with the pixel electrode 240 on the first substrate 210 . Unlike this, the common electrode is disposed on the entire surface of the second substrate 250 . is formed, and the pixel electrode 240 may be formed in the form of a plate in the pixel region.

Referring back to FIGS. 1 and 2 , a side sealing part 112 for preventing light leakage from the side surface of the display panel 110 is formed on the side surface of the display panel 110 . Some of the light output from the display panel 110 travels to the side surface of the display panel 110 . In the present invention, by providing the side sealing part 112 on the side surface of the display panel 110 , Suppresses light leakage caused by light traveling laterally. In addition, the side sealing part 112 protects the side surface of the display panel 110 from external impact.

The side sealing part 112 may be made of a material that absorbs light, and may be formed by applying a sealing liquid to the side surface of the display panel 110 and curing it.

The side sealing part 112 may completely cover the side surface of the display panel 110 . Alternatively, the side sealing part 112 may partially cover the side surface of the display panel 110 , and in this case, the side sealing part 112 may partially expose the upper and lower sides of the side surface of the display panel 110 .

Next, the cover unit 120 is positioned on the rear side of the display panel 110 , that is, under the display panel 110 . The cover unit 120 may have a hemming structure in which an end is folded.

In more detail, the cover unit 120 includes a first portion 122 and a second portion 124 . The first part 122 has a flat plate shape corresponding to the rear surface of the display panel 110 , the second part 124 is connected to the first part 122 , and the inner surface thereof is the inner surface of the first part 122 . Folded to face the second portion 124 overlaps the first portion 122 . The cover unit 120 having such a hemming structure has a curved side surface. Accordingly, by exposing the cover unit 120 to the outside without a separate component, it is possible to provide a display device having a differentiated and excellent design, and it is possible to prevent a user from being injured by an angled corner.

When the display panel 110 is an electroluminescent display panel, the cover unit 120 may be a back cover. Alternatively, when the display panel 110 is a liquid crystal display panel, the cover unit 120 may be a bottom cover, and in this case, a backlight unit (not shown) as a light source between the display panel 110 and the butter cover. ) may be further located.

The cover unit 120 may be made of a metal material having a relatively high stiffness, but is not limited thereto. For example, the cover unit 120 may be made of an electrolytic galvanized iron (EGI) containing iron (Fe) as a main component.

Alternatively, the cover unit 120 may be a middle frame between the back cover and the display panel 110 or between the bottom cover and the display panel 110 .

Although not shown, between the display panel 110 and the cover unit 120 , more specifically, between the display panel 110 and the first portion 122 of the cover unit 120 , the driving unit and the heat dissipation member and/or auxiliary A plate or the like may be further positioned.

The driving unit is connected to at least one side of the display panel 110 to apply various signals to the display panel 110 . The driving unit may include a printed circuit board (PCB) and at least one integrated circuit (IC) on the printed circuit board. The integrated circuit may be, but is not limited to, a timing controller (T-Con) or a power IC. In addition, the driving unit may further include components such as resistors, capacitors, or transistors on the printed circuit board.

The driving unit is connected to the display panel 110 through an intermediate means and is placed on the rear surface of the display panel 110 during the modularization process. In this case, the printed circuit board is positioned between the display panel 110 and the integrated circuit. Here, the medium may be a flexible printed circuit (FPC), a tape, or a film, but is not limited thereto.

The heat dissipation member is in contact with the integrated circuit or display panel 110 of the driving unit to quickly transfer heat generated in the integrated circuit or the display panel 110 of the driving unit to the outside, thereby preventing the device from being deteriorated by the heat.

The auxiliary plate increases the rigidity of the display device to prevent warpage. That is, in the case of a display device having a large screen, the display device may be warped. By adding an auxiliary plate to increase the rigidity of the display device, it is possible to prevent the display device from being warped.

Meanwhile, a gap maintaining member 130 is positioned between the display panel 110 and the cover unit 120 , and more specifically, between the display panel 110 and the second part 124 of the cover unit 120 to display the display. A distance between the panel 110 and the cover unit 120 is maintained constant. Here, the gap maintaining member 130 may be a single-sided tape having an adhesive on one surface, and the gap maintaining member 130 may have an adhesive surface in contact with the cover unit 120 . .

The gap maintaining member 130 may be formed except for a portion where the driving unit is connected to the display panel 110 . That is, the gap maintaining member 130 may be formed to correspond to three surfaces of the display panel 110 and may have a 'C' shape, but is not limited thereto.

The gap maintaining member 130 is spaced apart from the side surface of the display panel 110 at a predetermined distance d1 . For example, the spacing d1 of the gap maintaining member 130 may be 0.5 mm to 1.5 mm, preferably 0.7 mm to 1.0 mm, but is not limited thereto.

An adhesive member 140 is formed outside the gap maintaining member 130 , and the display panel 110 and the cover unit 20 are fixed to each other through the adhesive member 140 . The adhesive member 140 includes a first adhesive part 142 and a second adhesive part 144 outside the first adhesive part 142 .

Here, the first adhesive part 142 surrounds the gap maintaining member 130 and has a substantially rectangular frame shape. The first adhesive part 142 contacts the lower surface of the edge of the display panel 110 and the upper surface of the second part 124 of the cover unit 120 . The first adhesive portion 142 may be formed to be spaced apart from the gap maintaining member 130 . Alternatively, the first adhesive part 142 may contact the gap maintaining member 130 .

The first thickness t1 of the first adhesive part 142 corresponds to the thickness of the gap maintaining member 130 . For example, the first thickness t1 of the first adhesive part 142 may be 0.5 mm to 1 mm, but is not limited thereto.

The first adhesive part 142 may be spaced apart from the side sealing part 112 on the side of the display panel 110 . Alternatively, the first adhesive portion 142 may contact and/or overlap a portion of the side sealing portion 112 .

Meanwhile, the second adhesive part 144 is in contact with the first adhesive part 142 to surround the first adhesive part 142 and has a substantially rectangular frame shape. The second adhesive part 144 is in contact with a side surface of the display panel 110 on which the side sealing part 112 is positioned and an upper surface of the second part 124 of the cover unit 120 . The second adhesive part 144 may completely cover the side sealing part 112 .

The second thickness t2 of the second adhesive part 144 corresponds to the thickness of the display panel 110 , and the second thickness t2 of the second adhesive part 144 is the first thickness of the first adhesive part 142 ( t2) may be greater. For example, the second thickness t2 of the second adhesive part 144 may be 1 mm to 3 mm, but is not limited thereto.

The first adhesive part 142 should be easily separated when adhesion failure occurs between the display panel 110 and the cover unit 120 , and serves as a buffer against bending of the display panel 110 in the environmental reliability evaluation. Accordingly, the first adhesive portion 142 has a relatively soft characteristic. On the other hand, since the second adhesive part 144 is exposed to the outside, it has a relatively hard characteristic to prevent external pressure or scratches.

Accordingly, the storage modulus of the first adhesive part 142 is smaller than that of the second adhesive part 144, and the strength of the second adhesive part 144 is greater than that of the first adhesive part 142, and the first adhesive part ( The elongation of the 142 is preferably greater than that of the second bonding portion 144 .

For example, the storage modulus of the first adhesive part 142 may be less than 10 ⁵ Pa, and the storage modulus of the second adhesive part 144 may be greater than 10 ⁷ Pa, but is not limited thereto. In addition, the hardness of the second adhesive part 144 is preferably Shore D 30 or more, and the elongation of the first adhesive part 142 is preferably 300% or more.

Meanwhile, the first adhesive part 142 may implement a specific color by including a pigment and/or dye as necessary. On the other hand, the second adhesive part 144 does not include a pigment or dye and is transparent. These first and second adhesive parts 142 and 144 are formed by applying a resin compound and then curing it using UV light. Since the relatively thick second adhesive part 144 may not be completely cured when it is opaque, The second adhesive part 144 is preferably transparent. In addition, when the second adhesive part 144 includes a pigment or dye, a color loss phenomenon occurs due to environmental reliability evaluation or external contact, and thus a desired color cannot be realized.

The resin composition of the first and second adhesive portions 142 and 144 includes an oligomer, a monomer, a photo-initiator, and other additives. Here, the resin composition preferably has a viscosity of 20,000 cp to 40,000 cp.

As the oligomer, trifunctional urethane acrylate, hexafunctional urethane acrylate, and difunctional epoxy acrylate may be used, and these may be used alone or in combination of two or more.

As the trifunctional urethane acrylate, aliphatic urethane triacrylate may be used, and as the hexafunctional urethane acrylate, aliphatic urethane hexaacrylate may be used, and bifunctional epoxy As the acrylate, bisphenol A epoxy diacrylate may be used, but is not limited thereto.

Monomers include 2-phenoxyethyl acrylate, isobornyl acrylate, pentaerythritol triacrylate, and 1,6-hexanediol diacrylate (1,6). -hexanediol diacrylate) may be used alone or in combination of two or more, but is not limited thereto.

The photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (2,4,6-trimethylbenzoyl-diphenylphosphine oxide) or bis(2,4,6-trimethylbenzoyl)-phenyl-phosphine oxide (bis(2 ,4,6-trimethyl benzoyl)-diphenyl-phosphine oxide) may be used alone or in combination, but is not limited thereto.

Other additives include N,N-dimethyl acrylamide, 4-acryloyl morpholine, N-vinyl caprolactam, N-vinyl Pyrrolidone (N-vinylpyrrolidone), hexanediol diacrylate, ethoxylated (30) bisphenol A diacrylate (ethoxylated (30) bisphenol A diacrylate), octadecyl 3- (3,5-di -tertbutyl-4-hydroxyphenyl)-propionate (octadecyl-3-(3,5-di-tertbutyl-4-hydroxyphenyl)-propionate) and the like may be used, and these may be used alone or in combination of two or more may, but is not limited thereto.

Here, the resin composition of the first adhesive part 142 contains more trifunctional urethane acrylate and less hexafunctional urethane acrylate than the resin composition of the second adhesive part 144 .

For example, the first adhesive portion 142 may include 60 wt% of aliphatic urethane triacrylate, 7 wt% of aliphatic urethane hexaacrylate, 5 wt% of bisphenol A epoxy diacrylate, 10 wt% of 2-phenoxyethyl acrylate, 3 wt % 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 3 wt % N,N-dimethyl acrylamide, 5 wt % hexanediol diacrylate, 6.5 wt % ethoxylated (30) Bisphenol A It may be formed of a resin composition including diacrylate and 0.5wt% of octadecyl 3-(3,5-di-tertbutyl-4-hydroxyphenyl)-propionate, and the second adhesive part 144 . is 10wt% of aliphatic urethane triacrylate and 45wt% of aliphatic urethane hexaacrylate, 20wt% of bisphenol A epoxy diacrylate, 11.5wt% of pentaerythritol triacrylate, 3wt% of 2,4,6-trimethylbenzoyl Diphenylphosphine oxide, 5 wt % N,N-dimethyl acrylamide, 5 wt % hexanediol diacrylate, and 0.5 wt % octadecyl 3-(3,5-di-tertbutyl-4-hydroxyphenyl )- may be formed of a resin composition containing propionate.

As described above, in the display device according to the embodiment of the present invention, by fixing the display panel 110 to the cover unit 120 using the adhesive member 140 , the weight and thickness of the display device can be reduced and the bezel area can reduce

The adhesive member 140 of the present invention includes a first adhesive part 142 and a second adhesive part 144 having different physical properties, and the first and second adhesive parts 142 and 144 are formed using a resin composition, Cost can be reduced compared to adhesive tape.

In addition, by applying the adhesive member 140 to the exterior of the display device without a separate component, it is possible to implement a design differentiated from the existing ones while being light and thin. In this case, the first adhesive part 142 may provide a display device of various designs by implementing a specific color including a pigment and/or dye as necessary.

In addition, in the display device according to the embodiment of the present invention, the display panel 110 and the cover unit 120 are formed by the first adhesive part 142 having a relatively low storage modulus and a high elongation when evaluating environmental reliability under a certain temperature. By alleviating the warpage of the adhesive member 140 , delamination of the adhesive member 140 may be prevented.

In addition, when the adhesive member 140 is formed, a lot of coating defects due to air bubbles occur in the portion adjacent to the gap maintaining member 130 . When the coating failure occurs, only the first adhesive part 142 needs to be removed, so the separation process is easy. .

On the other hand, since the second adhesive portion 144 exposed to the outside has a relatively high hardness, it is possible to prevent the appearance from being pressed or scratched.

Hereinafter, a manufacturing process of a display device according to an embodiment of the present invention will be described with reference to the drawings.

4A to 4F are cross-sectional views schematically illustrating a manufacturing process of a display device according to an exemplary embodiment of the present invention.

First, as shown in FIG. 4A , a cover unit 120 including a first part 122 and a second part 124 and having a hemming structure is prepared, and a second part 124 of the cover unit 120 is prepared. ) The gap maintaining member 130 is disposed on the upper portion. The gap maintaining member 130 is adhered to the second portion 124 of the cover unit 120 by having adhesiveness to the lower surface thereof.

Next, as shown in FIG. 4B , the display panel 110 having the side sealing part 112 formed on the side surface is prepared, and the display panel 110 is disposed on the gap maintaining member 130 .

Next, as shown in FIG. 4C , after applying the first resin composition to surround the gap maintaining member 130 between the display panel 110 and the second part 124 of the cover unit 120 , UV is used. The first adhesive portion 142a is formed by curing the applied first resin composition. The first adhesive part 142a contacts the lower surface of the edge of the display panel 110 and the upper surface of the second part 124 of the cover unit 120 to fix the display panel 110 and the cover unit 120 .

The first adhesive part 142a may be spaced apart from the side sealing part 112 of the side surface of the display panel 110 . Alternatively, the first adhesive portion 142a may contact and/or overlap a portion of the side sealing portion 112 .

However, when the first resin composition is applied, bubbles may be generated or the positions of the display panel 110 and the cover unit 120 may be shifted.

Accordingly, as shown in FIG. 4D , the display panel 110 and the cover unit 120 are separated by removing the first adhesive portion ( 142a of FIG. 4D ). In this case, since the first adhesive part ( 142a of FIG. 4D ) has a relatively soft characteristic and has a high elongation, the display panel 110 and the cover unit 120 can be easily separated without defects. That is, the first adhesive part ( 142a in FIG. 4D ) is separated from the display panel 110 and the cover unit 120 and the remaining part is removed by pulling it. The first adhesive part ( 142a in FIG. 4D ) is relatively Because it has a soft characteristic and has a high elongation, it is removed without breaking and no residue of the first adhesive portion ( 142a in FIG. 4D ) is left on the display panel 110 and the cover unit 120 .

In addition, since the first adhesive part (142a in FIG. 4D) is spaced apart from the side sealing part 112 or contacts and/or overlaps with a part of the side sealing part 112, the first adhesive part (without damage to the side sealing part 112) ( Only 142a) of FIG. 4D can be removed.

Next, as shown in FIG. 4E , the display panel 110 is placed again on the gap maintaining member 130 , and a first resin composition is applied and cured to form the first adhesive part 142 again. The re-formed first adhesive part 142 contacts the lower surface of the display panel 110 and the upper surface of the second part 124 of the cover unit 120 to fix the display panel 110 and the cover unit 120 .

Next, when defects such as generation of bubbles in the first adhesive part 142 or misalignment between the display panel 110 and the cover unit 120 do not occur, as shown in FIG. 4F , the first adhesive part 142 is After applying the second resin composition to the outside, the second adhesive part 144 in contact with the first adhesive part 142 is formed by curing the applied second resin composition using UV light.

In this case, the second adhesive part 144 is in contact with the side surface of the display panel 110 on which the side sealing part 112 is positioned and the upper surface of the second part 124 of the cover unit 120 . The second adhesive part 144 may completely cover the side sealing part 112 .

Since the second adhesive part 144 is exposed to the outside, by having a hardness of 30 or more Shore D, external pressure or scratches are prevented.

On the other hand, when the second resin composition is applied, if adhesion failure occurs due to the generation of air bubbles, etc., the display panel 110 and the cover unit 120 are separated by removing the first adhesive part 142 together with the second adhesive part 144 . and, by performing the steps of FIGS. 4E and 4F , the first and second adhesive portions 142 and 144 are formed again.

As described above, in the present invention, by attaching the display panel 110 and the cover unit 120 using the first and second adhesive portions 142 and 144 having different physical properties, it is possible to reduce the occurrence of poor coating due to air bubbles. . In addition, the coating defect mainly occurs adjacent to the gap maintaining member 130 . When the coating failure occurs, only the first adhesive part 142 needs to be removed, so that the display panel 110 and the cover unit 120 can be easily separated. and it is possible to prevent damage to the side sealing part 112 . In addition, since the display panel 110 and the cover unit 120 can be separated without damage, the display panel 110 and the cover unit 120 can be recycled to increase productivity and reduce costs.

Although the case in which the cover unit has a hemming structure has been described in the previous embodiment, the cover unit may have another structure. The structure of the cover unit of the present invention will be described in more detail with reference to the drawings.

5A to 5C are cross-sectional views schematically illustrating a display device according to another exemplary embodiment of the present invention. The structure except for the cover unit is the same as that of the previous exemplary embodiment, and the same reference numerals are given to the same parts, and descriptions thereof are made. is omitted or abbreviated.

5A to 5C , a display device according to another exemplary embodiment of the present invention includes a display panel 110 having a side sealing part 112 formed on a side thereof, and a display panel 110 positioned on the rear side. a cover unit 320 , 420 , 520 , a gap maintaining member 130 between the display panel 110 and the cover unit 320 , 420 , and 520 , and an adhesive member 140 outside the gap maintaining member 130 . do. The adhesive member 140 includes a first adhesive part 142 surrounding the gap maintaining member 130 and a second adhesive part 144 outside the first adhesive part 142 .

As shown in FIG. 5A , the cover unit 320 according to another embodiment of the present invention may have an inner bending structure in which an end is bent inward.

More specifically, the cover unit 320 includes first, second, and third portions 322 , 324 , 326 . The first portion 322 has a flat plate shape corresponding to the rear surface of the display panel 110 , the second portion 324 overlaps and parallel to the first portion 322 , and the third portion 326 includes the first The portion 322 and the second portion 324 are connected.

Components such as a driving unit, a heat dissipation member, an auxiliary plate, and/or a backlight unit may be positioned between the display panel 110 and the first portion 322 of the cover unit 320 , depending on the type and thickness of the component. The distance between the display panel 110 and the first part 322 may be adjusted by adjusting the length of the third part 326 .

Here, the third portion 326 bends substantially vertically upwardly from the first portion 322 , and the second portion 324 bends substantially vertically inwardly from the third portion 326 . In this case, outer surfaces of the portion where the third portion 326 and the first portion 322 meet and the portion where the third portion 326 and the second portion 324 meet form a curved surface. Accordingly, by exposing the cover unit 320 to the outside without a separate component, a display device having a differentiated and excellent design can be provided, and it is possible to prevent a user from being injured by an angled corner.

Alternatively, the cover unit 420 according to another embodiment of the present invention may have an outer bending structure in which an end is bent outward, as shown in FIG. 5B .

More specifically, the cover unit 420 includes first, second, and third portions 422 , 424 , 426 . The first part 422 has a flat plate shape corresponding to the rear surface of the display panel 110 , the second part 424 is parallel to and spaced apart from the first part 422 , and the third part 426 is the first part 426 . The portion 422 and the second portion 424 are connected.

Components such as a driving unit, a heat dissipation member, an auxiliary plate, and/or a backlight unit may be positioned between the display panel 110 and the first portion 422 of the cover unit 420 , and depending on the type and thickness of the component, The distance between the display panel 110 and the first part 422 may be adjusted by adjusting the length of the third part 426 .

Here, the third portion 426 is bent substantially vertically upwardly from the first portion 422 , and the second portion 424 is bent substantially vertically outwardly from the third portion 426 . In this case, outer surfaces of the portion where the third portion 426 and the first portion 422 meet and the portion where the third portion 426 and the second portion 424 meet form a curved surface. Accordingly, by exposing the cover unit 420 to the outside without a separate component, it is possible to provide a display device having a differentiated and excellent design, and it is possible to prevent a user from being injured by an angled corner.

On the other hand, a buffer portion 428 may be further formed on the side surface of the second portion 424 . The buffer part 428 is made of an elastic material to prevent damage to the display device due to external impact, and by removing the exposed edge of the second part 424, it prevents the user from being injured by the angled edge. can do.

Alternatively, the cover unit 520 according to another embodiment of the present invention may include a cover part 522 and a frame part 524 as shown in FIG. 5C .

In more detail, the cover part 522 has a flat plate shape corresponding to the rear surface of the display panel 110 and is located below the display panel 110 , and a rectangular frame is disposed between the display panel 110 and the cover part 522 . A frame portion 524 of the form is located. The cover part 422 may be a back cover or a bottom cover, and the frame part 524 may be a middle frame or a middle cabinet. The cover part 522 may further include a side surface in addition to a flat flat surface. In addition, the frame portion 524 may have a 'L'-shaped cross-section including a horizontal portion and a vertical portion.

The first gap maintaining member 130 is positioned between the display panel 110 and the frame part 524 , and more particularly, between the display panel 110 and the horizontal part of the frame part 524 , and the display panel 110 . ) and the frame portion 524 are fixed through the adhesive member 140 formed outside the first gap maintaining member 130 . The first gap maintaining member 130 may be a single-sided tape having adhesiveness on one surface, and the adhesive surface may contact the frame unit 524 .

In addition, the second gap maintaining member 560 is positioned between the cover part 522 and the frame part 524 , more specifically, between the cover part 522 and the horizontal part of the frame part 524 . The second gap maintaining member 560 may be a single-sided tape having adhesiveness on one surface, and the adhesive surface may be in contact with the cover part 522 . In this case, the cover part 522 and the frame part 524 may be fixed using fixing means (not shown) such as screws.

Alternatively, the second gap maintaining member 560 may be a double-sided tape having adhesive properties on both sides, and in this case, the cover part 522 and the frame part 524 are provided without a separate fixing means. can be fixed.

As such, the configuration of the adhesive member 140 of the present invention can be applied to the cover units 320 , 420 , and 520 having various structures.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below You will understand that it can be done.

100: display device 110: display panel
112: side sealing unit 120: cover unit
122: first part 124: second part
130: adhesive member 140: adhesive member
142: first adhesive part 144: second adhesive part

Claims (9)

a display panel for displaying an image;
a cover unit under the display panel;
a gap maintaining member between the display panel and the cover unit;
an adhesive member positioned outside the gap maintaining member and bonding the display panel and the cover unit to each other
including,
The adhesive member includes a first adhesive part and a second adhesive part outside the first adhesive part,
The strength of the second adhesive part is greater than that of the first adhesive part.
According to claim 1,
The storage modulus of the first adhesive part is smaller than that of the second adhesive part.
According to claim 1,
The elongation of the first adhesive part is greater than that of the second adhesive part.
delete According to claim 1,
The first adhesive part includes a pigment or dye, and the second adhesive part is transparent.
6. The method of claim 5,
The second adhesive part is thicker than the first adhesive part.
According to claim 1,
The first adhesive portion is in contact with a lower surface of the display panel and an upper surface of the cover unit.
8. The method of claim 7,
The second adhesive portion is in contact with a side surface of the display panel and an upper surface of the cover unit.
8. The method of claim 7,
A side sealing part is formed on a side surface of the display panel, and the first adhesive part is spaced apart from the side sealing part or overlaps a part of the side sealing part.

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