KR20190065611A - Electroluminescent display device - Google Patents

Abstract

According to the present invention, provided is an electroluminescent display device comprising: a display panel including a light emitting diode and having a polarizing plate on a first surface; a bottom cover positioned on a second surface side of the display panel; and a first adhesive pattern positioned between the display panel and the bottom cover and positioned at an edge of the bottom cover, and a second adhesive pattern positioned at a side of the bottom cover. The first adhesive pattern includes a soft bead so as to have a lower elasticity than that of the second adhesive pattern. Therefore, the present invention is intended to solve a problem of separation and/or breakage of a display panel in a conventional electroluminescent display device.

Description

[0001] Electroluminescent display device [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescence display device, and more particularly, to an electroluminescence display device capable of preventing a problem of deformation of a display panel.

Electroluminescent display device, which is one of the new flat panel displays, has a better viewing angle and contrast ratio than liquid crystal display devices because it is a self-luminous type and can be lightweight and thin because it does not need backlight , And power consumption.

And it is able to drive DC low voltage, has fast response time and is all solid, so it is resistant to external impact, has wide temperature range, and is cheap in terms of manufacturing cost.

In an active matrix type electroluminescent display device, a voltage for controlling a current applied to a pixel is stored in a storage capacitor, and a voltage is maintained until a next frame signal is applied , And is driven so as to maintain the light emitting state while one screen is displayed regardless of the number of gate wirings.

The electroluminescent display includes a display panel including a light emitting diode and a case covering the back surface of the display panel.

1 is a schematic cross-sectional view of a display panel of a conventional electroluminescent display device.

1, a display panel 10 of a conventional electroluminescence display includes a substrate 11, a driving thin film transistor Td positioned on the substrate 11, a driving thin film transistor Td connected to the driving thin film transistor Td, And a polarizing plate 70 on the upper portion of the light-emitting diode D. The light-

A semiconductor layer 20 is formed on a substrate 11 made of glass or plastic. The semiconductor layer 20 may be made of an oxide semiconductor material or polycrystalline silicon.

A gate insulating film 26 made of an insulating material is formed on the entire surface of the substrate 11 on the semiconductor layer 20. The gate insulating film 26 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 30 made of a conductive material such as a metal is formed on the gate insulating film 26 in correspondence with the center of the semiconductor layer 20.

An interlayer insulating film 36 made of an insulating material is formed on the entire surface of the substrate 11 on the gate electrode 30. The interlayer insulating film 36 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 film 36 has first and second contact holes 37 and 38 exposing both sides of the semiconductor layer 20. The first and second contact holes 37 and 38 are spaced apart from the gate electrode 30 on both sides of the gate electrode 30.

A source electrode 40 and a drain electrode 42 are formed of a conductive material such as metal on the interlayer insulating film 36.

The semiconductor layer 20, the gate electrode 30, the source electrode 40 and the drain electrode 42 constitute a driving thin film transistor Td.

Although not shown, on the substrate 11, there are provided a gate wiring and a data wiring respectively extending along the first and second directions, a switching thin film transistor connected to the gate wiring and the data wiring, A power wiring that is spaced apart can be formed.

The gate wiring and the data wiring cross each other to define a pixel region, and the driving thin film transistor Td is connected to the switching thin film transistor. A storage capacitor is provided in the pixel region.

A protective layer 50 having a drain contact hole 52 exposing the drain electrode 42 of the driving thin film transistor Td is formed covering the driving thin film transistor Td.

A first electrode 60 connected to the drain electrode 42 of the driving TFT Td is formed on the passivation layer 50 through a drain contact hole 52. On the protective layer 50, a bank 66 covering the edge of the first electrode 60 is formed. The bank 66 has an opening exposing the center of the first electrode 60.

A light emitting layer 62 and a second electrode 64 are sequentially stacked on the first electrode 60.

The first electrode 60 and the second electrode 64 facing the first electrode 60 and the light emitting layer 62 positioned between the first and second electrodes 60 and 64 form a light emitting diode D .

Further, the polarizing plate 70 is located on the light-emitting diode D. The light of the light emitting diode D passes through the second electrode 64 to display an image, and the polarizing plate 70 is positioned on the display surface side of the display panel 10. For example, the polarizer 70 may be attached to the light-emitting diode D through the adhesive 72. [

The polarizing plate 70 may be a circular polarizing plate, and external light is reflected by a component such as a wiring or an electrode in the display panel 10, thereby preventing the external contrast ratio from deteriorating.

However, in such an electroluminescent display device including the conventional display panel, there is a problem that the display panel is detached from the bottom cover or the display panel is broken due to deformation problems such as warping of the display panel.

SUMMARY OF THE INVENTION The present invention is intended to solve the problem of separation and / or breakage of a display panel in a conventional electroluminescent display device.

In order to solve the above problems, the present invention provides a display device comprising: a display panel including a light emitting diode and having a polarizing plate on a first surface; A bottom cover positioned on a second surface side of the display panel; A first adhesive pattern positioned between the display panel and the bottom cover and positioned at an edge of the bottom cover and a second adhesive pattern positioned at a side of the bottom cover, And has a lower elasticity than the second adhesive pattern.

In the electroluminescent display device according to the present invention, the first adhesive pattern of low elasticity is formed at the edge of the bottom cover, thereby preventing separation (peeling) or damage of the display panel in which the warping occurs due to the asymmetric structure.

Therefore, an electroluminescent display device with high reliability and high durability can be provided.

1 is a schematic cross-sectional view of a display panel of a conventional electroluminescent display device.
2A to 2C are schematic views for explaining a problem of deformation and separation of a display panel in an electroluminescent display device.
3 is a schematic plan view of an electroluminescent display device according to a first embodiment of the present invention.
4 is a schematic cross-sectional view of an electroluminescent display device according to a first embodiment of the present invention.
5 is a schematic cross-sectional view of a display panel of an electroluminescent display device according to the present invention.
6A to 6D are schematic cross-sectional views illustrating a manufacturing process of an electroluminescent display device according to a first embodiment of the present invention.
Figs. 7A and 7B are views for explaining a problem that occurs during continuous application of the first and second adhesive patterns. Fig.
8 is a graph showing the adhesive force between the first adhesive pattern, the second adhesive pattern, and the bottom cover.
9 is a schematic plan view of an electroluminescent display device according to a second embodiment of the present invention.
10 is a schematic plan view of an electroluminescent display device according to a third embodiment of the present invention.

As described above, in the conventional electroluminescent display device, a problem that the display panel is separated from the bottom cover or the display panel is broken due to warpage of the display panel occurs, which is caused by the asymmetrical structure of the display panel.

Referring to FIGS. 2A to 2C, which schematically illustrate the problem of deformation and separation of a display panel in an electroluminescent display device together with FIG. 1, a bottom cover 90 having an adhesive layer 90 formed along an edge thereof The display panel 10 of the electroluminescent display device is seated to constitute an electroluminescent display device.

That is, the rear surface of the display panel 10 is covered with the bottom cover 90.

However, the display panel 10 of the electroluminescent display device has an asymmetric structure in which the polarizing plate 70 is located only on one side, that is, on the display surface side.

Therefore, a large deformation such as a curl of the display panel 10 is generated, and the stress due to the warpage is concentrated on the edge of the display panel 10. [ As a result, a problem that the display panel 10 is detached from the bottom cover 80 occurs.

In order to prevent this problem, it is possible to increase the area of the adhesive, for example, to apply the adhesive to the entire surface of the bottom cover 80, but this causes problems such as an increase in the weight of the electroluminescent display device.

On the other hand, although the problem of separation of the display panel 10 can be solved by increasing the adhesive force of the adhesive, there is a problem that the display panel 10 is broken due to stress concentration at the edges of the display panel 10. [

In order to solve such a problem, the present invention provides a display panel comprising: a display panel including a light emitting diode and having a polarizing plate on a first surface; A bottom cover positioned on a second surface side of the display panel; A first adhesive pattern positioned between the display panel and the bottom cover and positioned at an edge of the bottom cover and a second adhesive pattern positioned at a side of the bottom cover, And has a lower elasticity than the second adhesive pattern.

In the electroluminescent display of the present invention, the soft bead is any one of PMMA (polymethylmetacrylate) bead, polyurethane bead, and silicone bead.

In the electroluminescent display of the present invention, the first adhesive pattern has a first average thickness and the second adhesive pattern has a second average thickness smaller than the first average thickness.

In the electroluminescent display of the present invention, the first adhesive pattern has a first width and the second adhesive pattern has a second width smaller than the first width.

In the electroluminescent display device of the present invention, the second adhesive pattern has an adhesive force larger than that of the first adhesive pattern.

In the electroluminescent display device of the present invention, the second adhesive pattern includes the extended portion extending to the edge, and the extended portion is located inside the first adhesive pattern.

The electroluminescent display of the present invention further includes a third adhesive pattern corresponding to the edge and located inside the extension and including the soft bead.

In the electroluminescent display of the present invention, in the first bonding pattern, the soft bead has a first density, and in the third bonding pattern, the soft bead has a second density lower than the first density.

In the electroluminescent display device of the present invention, the first adhesive pattern has lower elasticity than the third adhesive pattern.

In the electroluminescent display device of the present invention, the display panel includes a substrate and a light emitting diode positioned between the substrate and the polarizing plate, and the substrate is in contact with the first and second adhesive patterns.

In the electroluminescent display device of the present invention, the polarizing plate and the bottom cover preferably have a first average distance corresponding to the first adhesive pattern and a second average distance corresponding to the second adhesive pattern, Have a distance.

In the electroluminescent display device of the present invention, the first adhesive pattern and the second adhesive pattern are spaced apart from each other.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a schematic plan view of an electroluminescent display device according to a first embodiment of the present invention, FIG. 4 is a schematic cross-sectional view of an electroluminescent display device according to a first embodiment of the present invention, and FIG. Sectional view of a display panel of an electroluminescent display device according to an embodiment of the present invention.

3 to 5, an electroluminescence display 100 includes a display panel 101 having a polarizing plate 170 disposed on a first side and including a light emitting diode D, A first adhesive pattern 190 positioned at the edge of the bottom cover 180 and including a soft bead 192 and a second adhesive pattern 190 positioned at a side of the bottom cover 180 And a second adhesive pattern 194 that bonds the first adhesive pattern 194 to the second adhesive pattern 194.

That is, the display panel 101 is attached (or coupled) to the bottom cover 180 by the first and second adhesive patterns 190 and 194, and the back side thereof is covered and covered by the bottom cover 180.

The display panel 101 includes a substrate 110, a driving thin film transistor Td positioned on the substrate 110, a light emitting diode D connected to the driving thin film transistor Td, Of the polarizing plate 170.

The substrate 110 may be a glass substrate or a flexible plastic substrate. For example, the substrate 110 may be a polyimide substrate.

A semiconductor layer 120 is formed on the substrate 110. The semiconductor layer 120 may be formed of an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer 120 is formed of an oxide semiconductor material, a light shielding pattern (not shown) may be formed under the semiconductor layer 120. The light shielding pattern prevents light from entering the semiconductor layer 120, (120) is prevented from being deteriorated by light. Alternatively, the semiconductor layer 120 may be made of polycrystalline silicon. In this case, impurities may be doped on both edges of the semiconductor layer 120.

A gate insulating layer 122 made of an insulating material is formed on the entire surface of the substrate 110 on the semiconductor layer 120. The gate insulating film 122 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 130 made of a conductive material such as metal is formed on the gate insulating layer 122 to correspond to the center of the semiconductor layer 120. A first capacitor electrode (not shown) of the gate line GL and the storage capacitor Cst may be formed on the gate insulating layer 122. The gate line GL may extend along the first direction and the first capacitor electrode may be connected to the gate electrode 130. [

In FIG. 5, a gate insulating film 122 is formed on the entire surface of the substrate 110. Alternatively, the gate insulating film 122 may be patterned in the same shape as the gate electrode 130. [

An interlayer insulating film 136 made of an insulating material is formed on the entire surface of the substrate 110 on the gate electrode 130. The interlayer insulating film 136 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride, or may be formed of an organic insulating material such as benzocyclobutene or photo-acryl.

The interlayer insulating film 136 has first and second contact holes 137 and 138 exposing both sides of the semiconductor layer 120. [ The first and second contact holes 137 and 138 are spaced apart from the gate electrode 130 on both sides of the gate electrode 130.

In FIG. 5, the first and second contact holes 137 and 138 are also formed in the gate insulating film 122. Alternatively, when the gate insulating film 122 is patterned in the same shape as the gate electrode 130, the first and second contact holes 137 and 138 may be formed only in the interlayer insulating film 136.

A source electrode 140 and a drain electrode 142 made of a conductive material such as a metal are formed on the interlayer insulating film 136. A data line DL, a power supply line PL, and a second capacitor electrode (not shown) may be formed on the interlayer insulating layer 136 in the second direction.

The source electrode 140 and the drain electrode 142 are spaced apart from each other around the gate electrode 130 and are in contact with both sides of the semiconductor layer 120 through the first and second contact holes 137 and 138 . The data line DL extends along the second direction to intersect the gate line GL to define the pixel region P and the power line PL for supplying the high potential voltage is spaced apart from the data line DL Located. Alternatively, the power wiring line PL may be formed so as to intersect with the data line DL by being positioned in parallel with the gate line GL in the same layer as the gate line GL. The second capacitor electrode is connected to the source electrode 140 and overlaps the first capacitor electrode to form a storage capacitor Cst by using the interlayer insulating film 136 between the first and second capacitor electrodes as a dielectric layer.

The semiconductor layer 120 and the gate electrode 130, the source electrode 140 and the drain electrode 142 constitute a driving thin film transistor Td. The driving thin film transistor Td is formed on the semiconductor layer 120, And has a coplanar structure in which the electrode 130, the source electrode 140, and the drain electrode 142 are located.

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

As described above, a switching thin film transistor Ts is further formed on the first substrate 110, and the switching thin film transistor Ts has substantially the same structure as the driving thin film transistor Td.

The gate electrode 130 of the driving thin film transistor Td is connected to the drain electrode of the switching thin film transistor Ts and the source electrode 140 of the driving thin film transistor Td is connected to the power wiring PL . A gate electrode (not shown) and a source electrode (not shown) of the switching thin film transistor Ts are connected to the gate wiring GL and the data wiring DL, respectively.

A protective layer 144 having a drain contact hole 146 exposing the drain electrode 142 of the driving thin film transistor Td is formed covering the driving thin film transistor Td.

A first electrode 160 connected to the drain electrode 142 of the driving thin film transistor Td through the drain contact hole 146 is formed separately on each of the pixel regions P on the passivation layer 144. The first electrode 160 may be an anode and may be formed of a conductive material having a relatively large work function value. For example, the first electrode 160 may be formed of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO).

Meanwhile, a reflective electrode or a reflective layer may be further formed under the first electrode 160. For example, the reflective electrode or the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy.

On the protective layer 144, a bank 166 covering the edge of the first electrode 160 is formed. That is, the bank 166 is located at the boundary of the pixel region P. [ The bank layer 166 has an opening corresponding to the pixel region P and surrounds the pixel region P to expose the center of the first electrode 160.

A light emitting layer 162 is formed on the first electrode 160. The light emitting layer 162 may include an organic light emitting material such as a phosphorescent compound or a fluorescent compound or an inorganic light emitting material such as a quantum dot.

The light emitting layer 162 may be a single layer structure of a light emitting material layer made of a light emitting material. The light emitting layer 162 includes a hole injection layer and a hole transporting layer which are sequentially stacked between the first electrode 160 and the light emitting material layer, And may further include an electron transporting layer and an electron injection layer sequentially stacked on the layer.

A second electrode 164 is formed on the substrate 110 on which the light emitting layer 162 is formed. The second electrode 164 is disposed on the front surface of the display region and is made of a conductive material having a relatively small work function value and can be used as a cathode. For example, the second electrode 164 may be formed of any one of aluminum (Al), magnesium (Mg), and aluminum-magnesium alloy (AlMg).

The first electrode 160 and the second electrode 164 facing the first electrode 160 and the light emitting layer 162 positioned between the first and second electrodes 160 and 164 are formed on the light emitting diode D, Respectively.

In addition, the polarizing plate 170 is positioned on the light-emitting diode D. The light of the light emitting diode D passes through the second electrode 164 to display an image, and the polarizing plate 170 is positioned on the display surface side of the display panel 101. For example, the polarizer 170 may be attached to the light emitting diode D through the electrode 172.

The polarizing plate 170 may be a circularly polarizing plate, and external light is reflected by components such as wires or electrodes in the display panel 101, thereby preventing the external contrast ratio from being lowered.

The first adhesive pattern 190 includes a soft bead 192 and has a low elastic property. For example, the soft bead 192 may be any one of polymethylmethacrylate (PMMA) beads, polyurethane beads, and silicone beads.

The second adhesive pattern 194 comprises substantially the same components as the adhesive component of the first adhesive pattern. That is, the second adhesive pattern 194 does not include a soft bead, so that the elasticity of the second adhesive pattern 194 is larger than that of the first adhesive 190.

For example, each of the second adhesive patterns 194 may comprise a binder, a composition comprising about 1 to 5 parts by weight of the initiator with respect to the binder, about 1 to 5 parts by weight of catalyst, and about 10 to 20 parts by weight of a pectin additive And the first adhesive pattern 190 is formed by a composition further comprising a soft bead 192 having about 1 to 10 parts by weight with respect to the binder.

For example, the binder may include an acrylic binder such as N-acryloyl morpholine (ACMO), isobornyl acrylate (IBOA), 2-phenoxyethyl acrylate, tetraethyleneglycol diacrylate and / or urethane binders such as diphenylmethane diisocyanate (MDI) have. The initiator may be phenylbis (2,4,6-trimethylbenzoyl-phospine oxide). The catalysts may be diethanol amine and dibutyltin dilaurate (DBTL). In addition, the ruthenium additive may be an inorganic particle such as TiO2 or SiO2.

The pectin additive causes the first and second adhesive patterns 190 and 194 to have a large shape. That is, the degree of spreading after application of the adhesive is reduced so that each of the first and second adhesive patterns 190 and 194 has a desired thickness.

As described later, when the first and second adhesive patterns 190 and 194 do not include the additive agent, the first and second adhesive patterns 190 and 194 do not have the desired shape, ) And the bottom cover 180 are completely attached to each other, so that a difficulty arises in the rework process.

The first adhesive pattern 190 includes about 1 to 10 parts by weight of the soft bead 192 with respect to the binder, so that the elasticity of the first adhesive pattern 190 is reduced and the drawing property is improved. If the soft bead 192 is less than 1 part by weight, the elongation property of the first adhesive pattern 190 is lowered due to the reduced elasticity. If the soft bead 192 is more than 10 parts by weight, And it is difficult to have a function as an adhesive.

That is, in the electroluminescent display device 100 of the present invention, an adhesive is formed on the edge of the bottom cover 180, and the adhesive is applied between the first adhesive pattern 190 located at the corner and the first adhesive pattern 190 And the first adhesive pattern 190 has a smaller elasticity and adhesive force than the second adhesive pattern 194. The second adhesive pattern 194 is located on the side of the second adhesive pattern 194,

The first adhesive pattern 190 has a first width w1 and the second adhesive pattern 194 has a second width w2 that is smaller than the first width w1. Since the first adhesive pattern 190 has an adhesive force smaller than that of the second adhesive pattern 194, the width of the first adhesive pattern 190 is increased to compensate for the insufficient adhesive force. Also, the first adhesive pattern 190 has a first average thickness and the second adhesive pattern 194 has a second average thickness that is less than the first average thickness.

Further, since the first adhesive pattern 190 has low elasticity and has a high elongation characteristic, the problem of separation (peeling) of the display panel 101 does not arise even if deformation such as warping occurs in the display panel 101. [

The first and second adhesive patterns 190 may be spaced apart from each other. Alternatively, the ends of the first and second adhesive patterns 190 may be connected to each other to form a continuous line.

The length of one side of the first adhesive pattern 190 may be about 100 to 200 mm. If the length of one side of the first adhesive pattern 190 is less than 100 mm, separation of the display panel 101 may occur at the corner. If the length of one side of the first adhesive pattern 190 is more than 100 mm, The problem of separation of the display panel 101 from the sides due to the reduced area of the pattern 192 may occur.

As described above, since the display panel 101 of the electroluminescence display device 100 has an asymmetric structure including the polarizing plate 170 only on one side thereof, deformation such as warping occurs in the display panel 101. [

The first adhesive pattern 190 including the flexible bead 192 and having low elasticity and high stretching property is applied to the display panel 101 and the bottom cover 180 at the edge of the display panel 101 It is possible to prevent the problem that the display panel 101 and the bottom cover 180 are separated (peeled off) from the corner or the display panel 101 is damaged at the corner.

6A to 6D are schematic cross-sectional views illustrating a manufacturing process of an electroluminescent display device according to a first embodiment of the present invention.

6A, a first adhesive forming the first adhesive pattern 190 including the soft bead 192 is applied to the edge of the bottom cover 180, and a second adhesive is applied to the side of the bottom cover 180 A second adhesive forming the pattern 194 is applied. The first and second adhesive patterns 190 are applied with an interval of the first distance d1. The first adhesive is applied to have a larger width than the second adhesive. Also, the first adhesive is applied to have a first thickness t1, and the second adhesive is applied to have a second thickness t2 that is less than the first thickness t1.

At this time, there is no limitation on the order of application of the first and second adhesives.

When the first and second adhesive are applied, the first and second adhesive are spread as shown in FIG. 6B so that the first and second adhesive patterns 190 are separated from each other by a second distance d2 ). At this time, the second distance d2 may be equal to or greater than zero. (d2? 0)

Alternatively, when the ends of the first and second adhesive patterns 190 and 194 are connected to each other, that is, when the adhesive forming the first and second adhesive patterns 190 and 194 is successively applied, A problem may occur that the first adhesive pattern 190 having a thickness overlaps with the second adhesive pattern 194 and covers the second adhesive pattern 194.

Referring to FIGS. 7A and 7B, which are diagrams for explaining a problem occurring in continuous application of the first and second adhesive patterns, the first and second adhesive patterns 190 and 194 When the first and second adhesives are successively applied, the first and second adhesive spread, and the end of the first adhesive pattern 190 is placed on the second adhesive pattern 194. That is, the ends of the first and second adhesive patterns 190 and 194 overlap.

The adhesion between the first and second adhesive patterns 190 and 194 and the bottom cover 180 and the adhesive force between the first and second adhesive patterns 190 and 194 are measured, Respectively. "Sample1" is a result of adhesion force measurement between the second adhesion pattern 194 and the bottom cover 180. "Sample2" is a result of adhesion force measurement between the first adhesion pattern 190 and the bottom cover 180. "Sample3""Is the result of adhesion measurement between the first and second adhesive patterns 190 and 194. (Unit [kgf / cm ² ])

[Table 1]

8, the adhesive force between the first adhesive pattern 190 and the bottom cover 180 is lowered by the soft bead, but the adhesive force between the first adhesive pattern 190 and the bottom cover 180 is less than the adhesive strength Lt; / RTI > However, the adhesive force between the first and second adhesive patterns 190 and 194 is smaller than the range satisfying the adhesive reliability.

As described above, by overlapping the first and second adhesive patterns 190 and 194, the display panel 101 is attached in a state that the first adhesive pattern 190 has an uneven upper surface, The adhesion between the pattern 190 and the second adhesive pattern 194 is weak so that the adhesion of the display panel 101 to the first and second adhesive patterns 190 and 194 may overlap.

Therefore, in the present invention, the first and second adhesive are applied at a distance of the first distance d1, so that the first and second adhesive patterns 190 and 194 do not overlap.

Next, as shown in Fig. 6C, the display panel 101 having the polarizing plate 170 is attached to the bottom cover 180 while being in contact with the first adhesive pattern 190. Fig. The display panel 101 is in a flat state at the time of attaching the display panel 101 so that the display panel 101 is in contact with the first adhesive pattern 190 and is separated from the second adhesive pattern 194. [

That is, at the time of attaching the display panel 101, the display panel 101 is joined by the first adhesive pattern 190. Therefore, when a problem such as an alignment defect between the display panel 101 and the bottom cover 180 occurs, the display panel 101 can be easily separated and the rework process can be performed.

The display panel 101 is bent by the asymmetric structure of the display panel 101 after the display panel 101 and the bottom cover 180 are attached. At this time, the first adhesive pattern 190 has a high elongation characteristic by the flexible beads 192, and as shown in FIG. 6D, the first adhesive pattern 190 is stretched and the separation of the display panel 101 from the edge Or breakage is prevented.

As a result, the polarizing plate 170 or the display panel 101 has a first average spacing (distance) from the bottom cover 180 corresponding to the first adhesive pattern 190 and corresponds to the second adhesive pattern 194 Lt; RTI ID = 0.0 > 1 < / RTI > average spacing.

9 is a schematic plan view of an electroluminescent display device according to a second embodiment of the present invention.

As shown in Fig. 9, the electroluminescent display 200 includes a display panel (101 in Fig. 5) including a polarizing plate (170 in Fig. 5) disposed on the first side and including a light emitting diode A bottom cover 280 disposed on the second side of the display panel 101, a first adhesive pattern 290 positioned on the edge of the bottom cover 280 and including a soft bead (192 in FIG. 4) And a second adhesive pattern 294 formed on the side of the bottom cover 280 and provided with an extension to the edge.

3, the second adhesive pattern 294 has a closed shape along the edge of the bottom cover 280, and the first adhesive pattern 294 is formed along the edge of the bottom cover 280. In other words, unlike the EL display device 200 of the first embodiment shown in FIG. 3, (290).

The first adhesive pattern 290 includes a soft bead, thereby reducing the elasticity. That is, the first adhesive pattern 290 has a smaller elasticity than the second adhesive pattern 294.

The first adhesive pattern 290 has a first width w1 and the second adhesive pattern 294 has a second width w2 that is less than the first width w1. In addition, the first adhesive pattern 290 has a first average thickness, and the second adhesive pattern 294 has a second average thickness that is less than the first average thickness.

In addition, the first and second adhesive patterns 290 and 294 may be spaced apart from each other.

10 is a schematic plan view of an electroluminescent display device according to a second embodiment of the present invention.

As shown in Fig. 10, the electroluminescent display 300 includes a display panel (101 in Fig. 5) including a polarizing plate (170 in Fig. 5) and a light emitting diode A bottom cover 380 disposed on the second side of the display panel 101, a first adhesive pattern 390 positioned on the edge of the bottom cover 380 and including a soft bead (192 in FIG. 4) A second adhesive pattern 394 formed at the edge of the bottom cover 380 and provided with an extension to the edge and a third adhesive pattern 396 positioned inside the second adhesive pattern 394 corresponding to the edge do.

That is, the second adhesive pattern 394 has a closed form along the edge of the bottom cover 380, and the first and third adhesive patterns 390 and 396 are formed in the shape of an extension of the second adhesive pattern 394 And an extension of the second adhesive pattern 394 is located between the first and third adhesive patterns 390 and 396. [

Each of the first and third adhesive patterns 390 and 396 includes a soft bead, thereby reducing the elasticity. That is, each of the first and third adhesive patterns 390 and 396 has elasticity smaller than that of the second adhesive pattern 394.

The first adhesive pattern 390 has a first width w1 and the second adhesive pattern 294 has a second width w2 and the third adhesive pattern 396 has a third width w3 . The second width w2 is smaller than the first and third widths w1 and w3. Also, the first width w1 may be equal to or greater than the third width w3. That is, the outermost first adhesive pattern 390 is applied in a larger width and thickness than the third adhesive pattern 396, and when the display panel 101 is bent, the first adhesive pattern 390 is displayed The separation of the edge of the panel 101 is prevented.

In addition, the soft bead may have a first density at the first bonding pattern 390 and a second density at the third bonding pattern 396 that is less than the first density. That is, the first adhesive pattern 390 located on the outermost side has elasticity smaller than that of the third adhesive pattern 396, and separation of the display panel from the end of the display panel 101 can be prevented.

In addition, the first adhesive pattern 290 has a first average thickness, and the second adhesive pattern 294 has a second average thickness that is less than the first average thickness.

In addition, the first and second adhesive patterns 290 and 294 may be spaced apart from each other.

As described above, the first adhesive pattern of low elasticity is formed at the corner of the bottom cover, thereby preventing the separation (peeling) or damage problem of the display panel in which the warping occurs due to the asymmetric structure. Therefore, an electroluminescent display device with high reliability and high durability can be provided.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

100, 200, 300: electroluminescent display device 101: display panel
110: substrate 170: polarizer
180, 280, 380: bottom cover 190, 290, 390: first adhesive pattern
192: Flexible beads 194, 294, 394: Second adhesive pattern
396: third adhesive pattern

Claims (12)

A display panel including a light emitting diode and having a polarizing plate on a first surface;
A bottom cover positioned on a second surface side of the display panel;
A first adhesive pattern positioned between the display panel and the bottom cover and positioned at a corner of the bottom cover, and a second adhesive pattern positioned at a side of the bottom cover,
Wherein the first adhesive pattern includes a soft bead and has lower elasticity than the second adhesive pattern.
The method according to claim 1,
Wherein the soft bead is any one of PMMA (polymethylmetacrylate) bead, polyurethane bead, and silicone bead.
The method according to claim 1,
Wherein the first adhesive pattern has a first average thickness and the second adhesive pattern has a second average thickness that is less than the first average thickness.
The method according to claim 1,
Wherein the first adhesive pattern has a first width and the second adhesive pattern has a second width smaller than the first width.
The method according to claim 1,
Wherein the second adhesive pattern has an adhesive force greater than that of the first adhesive pattern.
The method according to claim 1,
Wherein the second adhesive pattern includes an extension extending to the edge, and the extension is located inside the first adhesive pattern.
The method according to claim 6,
And a third adhesive pattern corresponding to the edge and located inside the extension and including the soft bead.
8. The method of claim 7,
Wherein the soft bead in the first adhesive pattern has a first density and the soft bead in the third adhesive pattern has a second density lower than the first density.
8. The method of claim 7,
Wherein the first adhesive pattern has lower elasticity than the third adhesive pattern.
The method according to claim 1,
Wherein the display panel includes a substrate and a light emitting diode positioned between the substrate and the polarizing plate,
Wherein the substrate is in contact with the first and second adhesive patterns.
The method according to claim 1,
Wherein the polarizing plate and the bottom cover have a first average distance corresponding to the first adhesive pattern and a second average distance smaller than the first average distance corresponding to the second adhesive pattern.
The method according to claim 1,
Wherein the first adhesive pattern and the second adhesive pattern are spaced apart from each other.

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