KR20100009912A - Organic light emitting diode display - Google Patents

Abstract

PURPOSE: An organic light emitting diode display is provided to inform a user of desired information by lighting an inorganic luminescence element. CONSTITUTION: A plurality of organic light-emitting devices is formed on a display space(A10). A first substrate(20) is formed in the outside of the display space and an inorganic light emission region(A40) forming a plurality of inorganic luminescence elements. A pad area(A20) is located on the first substrate of the outside of the inorganic light emission region. A second substrate(24) is fixed with a sealant to the first substrate. A sealing area including sealant including the sealant is formed between the display space and inorganic radiation area. The inorganic luminescence element comprises an inorganic light emitting layer, an anode electrode and a cathode electrode.

Description

Organic Light Emitting Display {ORGANIC LIGHT EMITTING DIODE DISPLAY}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device having an improved function by forming an inorganic light emitting device on an outer side of a display area.

The organic light emitting diode display includes organic light emitting devices including a hole injection electrode, an organic light emitting layer, and an electron injection electrode, and when an exciton generated by combining electrons and holes in the organic light emitting layer falls from an excited state to a ground state Light emission is caused by the generated energy.

In this way, the organic light emitting diode display has a self-luminous property and, unlike a liquid crystal display, does not require a separate light source, thereby reducing thickness and weight. In addition, the organic light emitting display device has high quality characteristics such as low power consumption, high luminance, and high response speed, and thus is considered as a next generation display device of portable electronic devices.

In general, an organic light emitting display device includes a panel assembly for forming organic light emitting diodes therein, a bezel coupled to the panel assembly at the rear of the panel assembly, and a printed circuit board electrically connected to the panel assembly through a flexible circuit board. .

In the organic light emitting diode display, two glass substrates constituting the panel assembly are attached through a sealant and a reinforcing material. The reinforcing material and the sealant prevent oxygen and moisture from penetrating into the organic light emitting device. Thus, when the reinforcing material and sealant are provided, not only the display area for displaying the image is reduced but also the dead space is increased compared to the size of the substrate. However, if the formation area of the stiffener and the sealant is reduced, the organic light emitting device may be impaired due to moisture and oxygen penetration into the organic light emitting device that is vulnerable to moisture and oxygen.

An object of the present invention is to provide an organic light emitting display device that can provide information or emit light using a dead space.

An organic light emitting display device according to an embodiment of the present invention includes a first substrate including a display area in which a plurality of organic light emitting devices are formed and an inorganic light emitting area formed outside the display area and in which a plurality of inorganic light emitting devices are formed; And a second substrate fixed to the first substrate at a distance from the first substrate.

A sealing area in which a sealant is formed may be formed between the display area and the inorganic light emitting area, the inorganic light emitting area may be formed in contact with the display area, and a transparent inorganic light emitting device may be provided in the inorganic light emitting area.

The inorganic light emitting device may include an inorganic light emitting layer that emits light, an anode electrode disposed to contact one surface of the inorganic light emitting layer, and a cathode electrode disposed opposite the anode electrode, wherein the inorganic light emitting layer includes manganese added to zinc oxide. It may include a material.

The cathode electrode or the anode electrode may be formed of any one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and antimony-zinc oxide (AZO), and an inorganic light emitting region is formed around the display area. It can be formed to follow.

The organic light emitting diode display may further include a bezel coupled to the first substrate at a rear side of the first substrate, a flexible circuit board fixed to the pad area and folded to the rear of the bezel, and electrically connected to the flexible circuit board. It may include a printed circuit board.

The organic light emitting display device according to the present invention can not only display the desired information to the user by emitting light from the inorganic light emitting device, but also improve the aesthetics by emitting light from a portion previously used as a dead space. The organic light emitting display device used in small electronic devices such as mobile phones should have the smallest size and provide the maximum effect. Thus, the function of providing information or emitting light using dead space can significantly increase the added value of the organic light emitting display device. In addition, it can stimulate the curiosity of consumers and improve the purchase motivation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 and 2 are exploded perspective views and a combined perspective view of an organic light emitting display device according to a first exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view of the organic light emitting display device shown in FIG. 2.

1 to 3, the organic light emitting display device 100 according to the present exemplary embodiment includes a panel assembly including a display area A10 and a pad area A20 and displaying a predetermined image in the display area A10. 12, a bezel 14 coupled to the panel assembly 12 at the rear of the panel assembly 12, and a printed circuit board 18 electrically connected to the panel assembly 12 via the flexible circuit board 16. It includes.

The panel assembly 12 is formed of a first substrate 20 and a second substrate having a smaller size than the first substrate 20 and whose edges are fixed to the first substrate 20 by sealants 27 (see FIG. 3). (24). A display area A10 where actual image display is performed is located in an area where the first substrate 20 and the second substrate 24 overlap, and a sealing area A30 provided with a sealant 27 is located outside the display area. . In addition, the inorganic light emitting area A40 is positioned outside the sealing area, and the pad area A20 is positioned on the first substrate 20 outside the inorganic light emitting area A40.

Subpixels are arranged in a matrix form in the display area A10 of the first substrate 20, and a scan for driving the subpixels between the display area A10 and the sealant 27 or outside the inorganic light emitting area A40 is performed. Drivers (not shown) and data drivers (not shown) are located. In the pad region A20 of the first substrate 20, pad electrodes (not shown) for transmitting electrical signals to the scan driver and the data driver are positioned.

Meanwhile, a polarizing plate (not shown) that suppresses reflection of external light may be positioned outside the display area A10 of the second substrate 24, and an absorbent material (not shown) may be disposed on an inner surface of the second substrate 24. Can be attached.

4 is a diagram illustrating a subpixel circuit structure of the panel assembly illustrated in FIG. 1, and FIG. 5 is a partially enlarged cross-sectional view illustrating the inside of the panel assembly illustrated in FIG. 1.

4 and 5, the subpixel of the panel assembly 12 includes an organic light emitting element L1 and a driving circuit unit. The organic light emitting element L1 includes an anode electrode 26, an organic emission layer 28, and a cathode electrode 30, and the driving circuit unit includes at least two thin film transistors T1 and T2 and one storage capacitor C1. Include. The thin film transistor basically includes a switching transistor T1 and a driving transistor T2.

The switching transistor T1 is connected to the scan line SL1 and the data line DL1, and converts the data voltage input to the data line DL1 into the driving transistor T2 according to the switching voltage input to the scan line SL1. send. The storage capacitor C1 is connected to the switching transistor T1 and the power supply line VDD and stores a voltage corresponding to a difference between the voltage received from the switching transistor T1 and the voltage supplied to the power supply line VDD.

The driving transistor T2 is connected to the power supply line VDD and the storage capacitor C1 to convert the output current I _OLED proportional to the square of the difference between the threshold voltages stored in the storage capacitor C1 to the organic light emitting element L1. The organic light emitting element L1 emits light by the output current I _OLED . The driving transistor T2 includes a source electrode 32, a drain electrode 34, and a gate electrode 36, and the anode electrode 26 of the organic light emitting element L1 is the drain electrode 34 of the driving transistor T2. ) Can be connected. However, the configuration of the subpixel is not limited to the above-described example and can be variously modified.

1 to 3, the sealant 27 is installed in the sealing area A30, and the sealant 27 is formed along the circumference of the display area A10. The sealant 27 bonds the second substrate 24 and the first substrate 20 at a predetermined distance to protect the driving circuit portions and the organic light emitting elements L1 formed in the first substrate 20 from the outside. .

The inorganic light emitting devices 22 are installed in the inorganic light emitting area A40, and the inorganic light emitting devices 22 are disposed along the circumference of the sealing area A30. The inorganic light emitting elements 22 emit light to display information or improve aesthetics, and serve as a reinforcing material for protecting the organic light emitting elements from moisture and oxygen.

6 shows an inorganic light emitting device. As shown in FIG. 6, the inorganic light emitting device 22 may include an anode electrode 72 formed on the first substrate 20 and an inorganic light emitting layer formed on the anode electrode 72. 61, and a cathode electrode 65.

The anode electrode 72 may be made of the same material as the anode electrode 26 of the organic light emitting element L1. An insulating layer 67 is formed between the anode electrode 72 and the first substrate 20, and the insulating layer 67 may also be made of the same material as the insulating layer of the organic light emitting element L1. Insulating electrodes 66 and 69 which insulate the cathode electrode 65 and the anode electrode 72 are formed on both sides of the anode electrode 72, and the anode wiring 72 is connected to the anode wiring 74, and the cathode electrode Cathode wires 76 are connected to 65 respectively.

The anode electrode 72, the insulating layers 66, 67, and 69, and the wirings 74 and 76 may be formed in common with the organic light emitting element. In addition, the cathode electrode and the anode electrode may be made of indium tin oxide (ITO), indium zinc oxide (IZO), or antimony-zinc oxide (AZO).

The inorganic light emitting layer 61 may be formed of a phosphor binder including ZnS: Cu, Cl and phosphor powder added with copper or chlorine to zinc sulfate having a diameter of 15 to 30 μm, and a polymer binder for fixing the phosphor powder. The inorganic light emitting layer 61 may be formed to emit orange color having a long lifespan.

In addition, an encapsulation layer 63 is formed under the second substrate, and the encapsulation layer 63 serves to seal moisture or oxygen from entering the organic light emitting element L1 through encapsulation, and the encapsulation layer 63. ) Is made of transparent material. However, in the case of the bottom emission, the encapsulation layer 63 may be made of the same opaque material as the sealant 27.

As described above, the inorganic light emitting element 22 seals between the first substrate 20 and the second substrate 24 together with the sealant 27 and supports them, thereby ensuring mechanical stability. In addition, the inorganic light emitting device 22 may emit light to display desired information to the user, and color may be displayed on a portion that was previously a dead space, thereby improving aesthetics.

The organic light emitting display device 100 used in a small electronic device such as a mobile phone should have a small size to maximize the effect. Thus, the function of providing information or emitting light by using a dead space is remarkably added value of the organic light emitting display device. It can improve the motivation to buy and stimulate the curiosity of consumers.

Referring back to FIGS. 1 to 3, the integrated circuit chip 44 is mounted on the pad region A20 of the panel assembly 12 by a chip on glass (COG) method, and a chip on film The flexible circuit board 16 is mounted in a film (COF) method. A passivation layer 46 is formed around the integrated circuit chip 44 and the flexible circuit board 16 to cover and protect the pad electrodes formed in the pad region A20.

The printed circuit board 18 is equipped with electronic elements (not shown) for processing a driving signal, and a connector (not shown) for transmitting an external signal to the printed circuit board 18 is provided. The flexible circuit board 16 fixed to the pad area A20 is folded to the rear of the bezel 14 so that the printed circuit board 18 is located at the rear of the bezel 14.

The bezel 14 extends toward the panel assembly 12 from the edge of the bottom 48 except for the bottom 48 where the panel assembly 12 is raised and the flexible circuit board 16 is folded. It consists of a side wall 50 facing the side of the panel assembly 12. A double-sided tape 52 may be positioned between the bottom 48 of the bezel 14 and the panel assembly 12 to fix the panel assembly 12 to the bezel 14.

The structure of the bezel 14 is not limited to the illustrated example and can be variously modified. For example, the bezel 14 forms a flange (not shown) of various shapes for strength reinforcement at the edge of the bottom portion 48 on which the flexible circuit board 16 is folded, or the side wall 50 is folded several times. It is possible to form so-called hemming sidewalls with increased strength.

The bezel 14 may be formed of a material having high rigidity, for example, stainless steel, cold rolled steel, aluminum, aluminum alloy, nickel alloy, or the like. On the other hand, the bezel 14 may be formed of a synthetic resin material, for example, may be formed of a polymer-based engineering plastic such as polycarbonate.

In the organic light emitting diode display 100 configured as described above, as the inorganic light emitting diode 22 is installed at the edge of the panel assembly 12, the organic light emitting diode display 100 can stably prevent moisture and oxygen from penetrating into the organic light emitting diode L1. have. In addition, the inorganic light emitting element 22 may display information by displaying letters or symbols, or may emit light to provide light as a lamp, and thus the space utilization rate is improved by utilizing dead space.

7 illustrates an organic light emitting display 200 according to a second embodiment of the present invention.

Since the organic light emitting diode display 200 according to the present exemplary embodiment is the same as the first exemplary embodiment except for the sealant and the inorganic light emitting element 29, the description of the same or similar configuration will be omitted.

In the organic light emitting diode display 200 according to the present exemplary embodiment, the inorganic light emitting device 29 is disposed in the place where the sealant is formed without forming the sealant. Accordingly, the region in which the inorganic light emitting element 29 is installed is enlarged than the first embodiment described above, but the internal structure of the inorganic light emitting element 29 is formed in the same manner as in the first embodiment.

The inorganic light emitting device 29 performs a sealing role in the same manner as the sealant to prevent moisture and oxygen from penetrating into the organic light emitting device L1. As described above, according to the present embodiment, since the sealant is not used, the dead space can be further reduced to display more information using the inorganic light emitting element 29.

In this embodiment, the electrode of the inorganic light emitting device is made of transparent ITO, IZO, AZO, the inorganic light emitting layer is made of a material in which manganese (Mn) is added to zinc oxide (ZnS) to ensure transparency. Accordingly, the inorganic light emitting region may be colorless and transparent when no light is emitted, and may emit light in a desired shape when light is emitted.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

1 is an exploded perspective view of an organic light emitting display device according to a first embodiment of the present invention.

2 is a perspective view illustrating a combined state of an organic light emitting display device according to a first embodiment of the present invention.

3 is a cross-sectional view of an organic light emitting display device according to a first embodiment of the present invention.

4 is a diagram illustrating a subpixel circuit of the panel assembly illustrated in FIG. 1.

FIG. 5 is a partially enlarged cross-sectional view illustrating the interior of the panel assembly shown in FIG. 1.

FIG. 6 is a partially enlarged cross-sectional view illustrating an inorganic light emitting device of the panel assembly shown in FIG. 1.

7 is a cross-sectional view of an organic light emitting display device according to a second embodiment of the present invention.

Claims (8)

A first substrate including a display area in which a plurality of organic light emitting devices are formed and an inorganic light emitting area formed outside the display area and in which a plurality of inorganic light emitting devices are formed; A second substrate fixed to the first substrate at a distance from the first substrate; And Organic light emitting display comprising a. The method of claim 1, An organic light emitting display device having a sealing area in which a sealant is disposed between the display area and the inorganic light emitting area. The method of claim 1, The inorganic light emitting region is formed in contact with the display area, and the inorganic light emitting region is provided with a transparent inorganic light emitting element. The method of claim 3, The inorganic light emitting device includes an inorganic light emitting layer that emits light, an anode electrode disposed to contact one surface of the inorganic light emitting layer, and a cathode electrode disposed opposite the anode electrode. The method of claim 4, wherein The inorganic light emitting layer includes a material in which manganese is added to zinc oxide. The method of claim 4, wherein The cathode or the anode is any one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and antimony-zinc oxide (AZO). The method of claim 3, The inorganic light emitting area is formed along the circumference of the display area. The method of claim 1, A bezel coupled to the first substrate at the rear of the first substrate; A flexible circuit board fixed to the pad area and folded to the rear of the bezel; And Printed circuit board electrically connected to the flexible circuit board Organic light emitting display comprising a.

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