KR101794646B1 - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting diode (OLED) display device and a method of manufacturing the same, which can improve the lifetime and image quality of a OLED display device by forming a second substrate having a heat dissipation function on the OLED display element. An organic light emitting display includes: a first substrate; An organic light emitting display device formed on the first substrate and including a first electrode, an organic light emitting layer, and a second electrode; A second substrate bonded to the first substrate to seal the organic light emitting display device and having grooves formed on an upper surface thereof; And a heat dissipation layer formed in the groove.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic light emitting display, and more particularly, to an organic light emitting display in which a second substrate having a heat dissipating function is formed on an organic light emitting display.

The image display device that implements various information on the screen is a key technology in the era of information and communication, and it is developing thinner, lighter, more portable and higher performance. In particular, an organic light emitting display device that controls the amount of light emitted from the organic light emitting layer by using a flat panel display device has recently been attracting attention as a flexible display capable of bending due to space and convenience is required.

The OLED display device includes an OLED display device formed by sequentially laminating a first electrode, a hole injection layer, a hole transport layer, an organic emission layer, an electron injection layer, an electron transport layer, and a second electrode on a first substrate, And a second substrate for encapsulating the display element.

The organic light emitting display device utilizes an electroluminescent phenomenon in which an electric field is formed at first and second electrodes at both ends of the organic light emitting layer, and electrons and holes are injected into the organic light emitting layer and the holes are coupled to each other. Electrons and holes are paired in the organic light emitting layer, and then emitted from the excited state to the base state.

However, due to the heat generated when driving the organic light emitting display device, the temperature of the organic light emitting display device increases and the organic light emitting layer, which is vulnerable to heat, deteriorates, shortening the lifetime of the organic light emitting display device and reducing image quality due to uneven efficiency. In order to prevent this, a general organic light emitting display device forms a heat radiation sheet on the second substrate to emit heat.

Since the heat-radiating sheet is attached to the second substrate through the adhesive, the thickness of the organic light-emitting display device becomes thick. Further, an additional process for attaching the heat-radiating sheet is required, resulting in an increase in the manufacturing cost of the organic light emitting display device and a reduction in the yield. In addition, the thermal conductivity of the heat-radiating sheet is reduced due to the adhesive between the organic light-emitting display and the heat-radiating sheet, thereby reducing the heat radiation effect.

FIG. 1 is a cross-sectional view showing a process of attaching a heat radiation sheet onto a second substrate, and FIG. 2 is a photograph where a poor image quality is caused by a heat radiation sheet attaching process.

1, a physical pressure is applied to the organic light emitting display device in order to attach the second substrate 140 and the heat dissipation sheet 160 to which the adhesive 150 is attached, The element 110 may come into contact with the element and be damaged. Also, when the second substrate is struck by the physical pressure for attaching the heat-radiating sheet and comes into contact with the organic light-emitting display device, the organic light-emitting display device receives pressure and is damaged as shown in FIG. 2, .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide an organic light emitting diode display capable of reducing the manufacturing cost of the organic light emitting display device by forming a second substrate having a heat dissipating function on the organic light emitting display device The purpose is to do.

According to an aspect of the present invention, there is provided an OLED display including: a first substrate; An organic light emitting display device formed on the first substrate and including a first electrode, an organic light emitting layer, and a second electrode; A second substrate bonded to the first substrate to seal the organic light emitting display device and having grooves formed on an upper surface thereof; And a heat dissipation layer formed in the groove.

The second substrate is an in-cap glass substrate, a metal foil, a thin film, or an insulating film.

And a getter formed between the second substrate and the OLED display.

The first substrate and the second substrate are bonded together by a face seal formed between the organic light emitting display and the second substrate.

The first substrate and the second substrate are bonded together by a sealing material formed on the edge of the first substrate so as to surround the side surfaces of the organic light emitting display device.

The heat dissipation layer is formed of a material having a thermal conductivity of 1 W / mK or more.

The heat dissipation layer is formed of a material selected from metal, silicon and graphite.

The grooves are formed on the entire upper surface of the second substrate excluding the edges corresponding to the sealing material.

The grooves are formed at a plurality of intervals on the outer surface of the upper surface of the second substrate.

INDUSTRIAL APPLICABILITY As described above, the organic light emitting display of the present invention has the following effects.

First, since a second substrate is formed on an OLED display device and a heat-radiating sheet is adhered to the second substrate using an adhesive, a thickness of the OLED display increases. However, since the organic light emitting diode display of the present invention forms a second substrate having a heat dissipating function, it is possible to make the OLED display slimmer.

Second, the OLED display of the present invention eliminates the process of attaching the heat-radiating sheet on the second substrate, thereby reducing the manufacturing cost and improving the yield.

Third, the distance between the organic light emitting display device and the heat dissipation material is shorter than that of a general organic light emitting display device in which the second substrate and the heat dissipation sheet are adhered with an adhesive, so that the heat dissipation effect can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a step of attaching a heat radiation sheet on a second substrate. FIG.
Fig. 2 is a photograph showing the image quality defect caused by the step of attaching the heat radiation sheet. Fig.
3A and 3B are cross-sectional views of an OLED display according to a first embodiment of the present invention;
4A and 4B are perspective views of a second substrate having grooves formed on its outer surface.
5A and 5B are cross-sectional views of an OLED display according to a second embodiment of the present invention.

Hereinafter, the organic light emitting diode display of the present invention will be described in detail with reference to the accompanying drawings.

* First Embodiment *

3A and 3B are cross-sectional views of an OLED display according to a first embodiment of the present invention. FIG. 3A illustrates a first substrate and a second substrate bonded together by a sealing material. FIG. 2 substrate is bonded with a face seal. 4A and 4B are perspective views of a second substrate having grooves formed on its outer surface.

3A, an OLED display according to an exemplary embodiment of the present invention includes a first substrate 200, an OLED 210 formed on the first substrate 200, And a second substrate 240 formed on the first substrate 200 and sealing the organic light emitting display device 210. A groove 240a is formed on the upper surface of the second substrate 240 A heat dissipation layer 260 is formed to be inserted into the groove 240a.

The first substrate 200 may be formed of glass or plastic and the second substrate 240 may be a glass substrate, a metal foil, a thin film or an insulating film. The first substrate 200 and the second substrate 240 Are sealed together with a sealing material 220 formed on the edge of the first substrate 200 so as to surround the side surface of the organic light emitting display 210. The sealing material 220 is thermosetting resin and UV- Resin.

A getter 230 for absorbing moisture introduced into the organic light emitting display 210 and the internal space of the second substrate 240 is formed under the second substrate 240. Although the getter 230 is formed on a flat surface of the second substrate 240 in the figure, the getter 230 may have a plurality of grooves (not shown) on the inner surface of the second substrate 240 having an in- (Not shown), and inserted into each groove (not shown).

Although not shown, a cell driver including a plurality of signal lines, a thin film transistor, and a protective layer is formed on the first substrate 200. The cell driver includes a switching transistor (not shown), a driving transistor (not shown), and a storage capacitor (Not shown).

The switching transistor supplies a data signal from the data line in response to the scanning signal of the gate line, and the driving transistor controls the amount of current flowing in the organic light emitting display device 210 through the connection electrode in response to the data signal from the switching transistor . The storage capacitor serves to supply a constant current through the driving transistor even though the switching transistor is turned off, and the driving transistor is electrically connected to the organic light emitting diode display 210 through the connection electrode.

The OLED display 210 includes a first electrode, a second electrode, and an organic light emitting layer between the first electrode and the second electrode, and the organic light emitting layer is injected into the first electrode and the second electrode, Excitons formed by the combination of holes and electrons fall into a base state, and light is emitted.

The organic light emitting layer includes a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer.

The first electrode (not shown) is an anode for injecting holes and is formed of a transparent conductive layer and electrically connected to the driving transistor of the cell driver. The transparent conductive layer may be formed of indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO) May be used.

The second electrode (not shown) is a cathode for supplying electrons to the light emitting layer (not shown), and may be a metal, an alloy, an electrically conductive compound having a low work function, or a mixture thereof. Specific examples thereof include lithium (Li), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium- .

The second substrate 240 formed on the organic light emitting display 210 prevents external moisture, oxygen, and the like from entering the organic light emitting display 210. The first substrate 200 and the second substrate 240 may be formed of a sealing material 220 formed on the edge of the first substrate 200 so as to surround the side surfaces of the organic light emitting display device 210 The first substrate 200 and the second substrate 240 may be bonded together with a face seal attached to the front surface of the organic light emitting display device 210. In this case, have. At this time, the second substrate 240 may be a metal foil, a thin film, or an insulating film.

When the second substrate 240 is a thin film, it may have a structure in which an organic film and an inorganic film are alternately laminated, and may be formed only of an organic film or an inorganic film.

When the organic light emitting display 210 is driven and heat is generated and the organic light emitting layer is deteriorated by the heat, the lifetime of the organic light emitting display 210 drastically decreases.

Accordingly, the present invention forms a groove 240a on the upper surface of the second substrate 240. [ 4A, the grooves 240a may be formed on the entire outer surface of the second substrate 240 of the second substrate 240 except for the edges corresponding to the sealing material 220. As shown in FIG. In addition, the grooves 240a may be formed on the outer surface of the upper surface of the second substrate 240 at a plurality of intervals, as shown in FIG. 4B.

The heat dissipation layer 260 is formed in the groove 240a by a method such as vapor deposition, plating, or coating.

The heat dissipation layer 260 is formed of a material having a high thermal conductivity to discharge heat generated from the organic light emitting diode 210 to the outside and is formed of a material having high thermal conductivity such as metal, It is preferable that the material has a conductivity of 1 W / mK or more.

As described above, the organic light emitting diode display according to the first embodiment of the present invention includes the heat dissipation layer 260 formed in the groove 240a on the surface of the second substrate 240, .

Accordingly, the distance between the organic light emitting display device and the heat dissipation material is shorter than that of a general organic light emitting display device in which the second substrate and the heat dissipation sheet are adhered with an adhesive, thereby improving the heat dissipation effect.

In addition, since the heat radiation sheet is not separately attached, it is possible to make the organic light emitting display device slim, and the manufacturing cost can be reduced. In addition, since the physical pressure for attaching the heat-radiating sheet is not applied to the organic light emitting display device, damage to the organic light emitting display device can be prevented and reliability of the organic light emitting display device can be improved.

* Second Embodiment *

5A is a cross-sectional view of an OLED display according to a second embodiment of the present invention, FIG. 5A is a view illustrating a first substrate and a second substrate bonded together by a sealing material, FIG. 5B is a cross- 2 substrate is bonded with a face seal.

The organic light emitting display of the first embodiment differs from the first and second embodiments of the present invention in that a groove is formed in the surface of the second substrate and a heat radiation layer is formed in the groove, And a heat dissipation layer is formed on the surface of the second substrate.

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

In order to avoid redundant description, the same parts having the same dynamics as those of the first embodiment described above are denoted by the same reference numerals and only the characteristic contents will be described.

5A, an OLED display according to a second exemplary embodiment of the present invention includes a first substrate 200, an OLED 210 formed on the first substrate 200, And a second substrate 340 formed on the first substrate 200 and sealing the organic light emitting display device 210. A heat dissipation layer 360 is formed on the upper surface of the second substrate 340 do.

The first substrate 200 and the second substrate 340 surround the side surfaces of the organic light emitting diode 210. The sealing material may be a sealing material formed on the edge of the first substrate 200 The first substrate 200 and the second substrate 340 may be attached to each other with a face seal attached to the front surface of the organic light emitting display device 210, have. At this time, the second substrate 240 may be a metal foil, a thin film, or an insulating film.

When the second substrate 340 is a thin film, the organic film and the inorganic film may be alternately laminated, and the organic film or the inorganic film may be formed.

The organic light emitting display according to the second embodiment of the present invention may be applied to an organic light emitting display such as a general organic light emitting diode display in which a heat radiation sheet is not directly attached to a second substrate using an adhesive, The heat dissipation layer 360 is formed by vapor deposition, plating or coating.

The heat radiating material is preferably a material having a high thermal conductivity such as metal, silicon, and graphite, and a thermal conductivity of 1 W / mK or more.

As described above, in the organic light emitting display according to the second embodiment of the present invention, the adhesive for attaching the second substrate and the heat radiation sheet is removed to reduce the thickness of the organic light emitting display device, The distance between the layers is shortened and the heat radiation effect can be improved.

In addition, since the heat radiation sheet is not separately attached, it is possible to make the organic light emitting display device slim, and the manufacturing cost can be reduced. Further, since the physical pressure for attaching the heat-radiating sheet is not applied to the organic light emitting display device, damage to the organic light emitting display device can be prevented and reliability of the organic light emitting display device can be improved.

In the conventional OLED display device, the adhesive absorbs a part of the heat emitted through the heat-radiating sheet to reduce the heat radiation effect. In the OLED display of the present invention, heat generated in the OLED display device is directly transmitted through the heat- The manufacturing cost of the organic light emitting display device can be reduced, the yield can be improved, and the thickness of the organic light emitting display device can be reduced.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

200: first substrate 210: organic light emitting display element
220: sealing material 230: getter (Getter)
240, 340: second substrate 240a: groove
260, 360: heat dissipation layer

Claims (9)

An organic light emitting display device disposed on the first substrate and including a first electrode, an organic light emitting layer, and a second electrode;
A second substrate bonded to the first substrate to seal the organic light emitting display device and having a plurality of grooves spaced apart from each other on an outer surface thereof; And
A heat dissipation layer filling the grooves of the second substrate,
And the heat dissipation layer is in direct contact with the second substrate. The method according to claim 1,
Wherein the second substrate is an in-cap glass substrate, a metal foil, a thin film, or an insulating film. The method according to claim 1,
And a getter positioned between the second substrate and the OLED display device. The method according to claim 1,
Wherein the first substrate and the second substrate are bonded together by a face seal positioned between the organic light emitting display and the second substrate. The method according to claim 1,
Wherein the first substrate and the second substrate are bonded together by a sealing material positioned at an edge of the first substrate so as to surround the side surfaces of the organic light emitting display device. The method according to claim 1,
Wherein the heat dissipation layer includes a material having a thermal conductivity of 1 W / mK or more. The method according to claim 1,
Wherein the heat dissipation layer comprises a material selected from the group consisting of metal, silicon, and graphite. 6. The method of claim 5,
Wherein the groove is located on an outer surface of the second substrate except an edge corresponding to the sealing material. delete

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