KR20080078320A - Display device - Google Patents

Abstract

A display device is provided to improve quality thereof by uniformly supplying driving voltage and common voltage to a driving voltage line and a common electrode of a display substrate through an encapsulation substrate and a conductive sealant. A display device(900) includes a display substrate(100), an encapsulation substrate, and a conductive sealant(400). The display substrate has first to fourth voltage pads(181-184). The encapsulation substrate has first and second connecting units(222) electrically connected to the first and second voltage pads respectively and a connecting line(230) to connect the first and second connecting units. The conductive sealant bonds the display substrate and the encapsulation substrate and electrically connects the third and fourth voltage pads.

Description

Display device {DISPLAY DEVICE}

1 is a plan view of a display device according to a first exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

FIG. 2 is a cross-sectional view taken along line III-III of FIG. 1.

FIG. 2 is a cross-sectional view taken along line IV-IV of FIG. 1.

FIG. 2 is a cross-sectional view taken along the line VV of FIG. 1.

Explanation of symbols on the main parts of the drawings

100 display substrate 110 first substrate member

120: driving circuit section 125: driving voltage line

130: organic light emitting device 135: common electrode

150: protective film 181: first voltage pad

182: second voltage pad 183: third voltage pad

184: fourth voltage pad 200: sealing substrate

210: second substrate member 221: first connecting portion

222: second connection portion 230: connection wiring

250: insulating film 400: conductive sealant

700: power supply unit 751: first connection member

752: second connecting member 760: anisotropic conductive film

800: driving integrated circuit chip

The present invention relates to a display device, and more particularly, to a display device capable of supplying a driving voltage and a common voltage effectively.

There are several types of display devices. Among them, liquid crystal display (LCD) devices and organic light emitting display (OLED) devices, which have improved performance while being miniaturized and lightened, are becoming representative display devices, centering on rapidly developing semiconductor technologies. have. In particular, in recent years, organic light emitting display devices, which are self-luminous display devices, have grown rapidly.

In general, an organic light emitting diode display includes a display substrate including an organic light emitting diode and a driving circuit unit for driving the organic light emitting diode, and an encapsulation substrate disposed to face the display substrate and cover the display substrate.

The display substrate is supplied with a driving voltage and a common voltage to display an image. The driving voltage is supplied to a thin film transistor (TFT) of the driving circuit portion, and the common voltage is supplied to the common electrode of the organic light emitting element.

However, in the conventional display device, in order to supply a driving voltage and a common voltage to the display substrate, a printed circuit board is attached to each edge of the display substrate, or wiring for transferring a voltage to the edge of the display substrate is complicated.

Therefore, the display device has a problem in that the overall size of the display device is increased compared to the effective display area for displaying an image, and thus the advantage of the organic light emitting display device suitable for forming a slim appearance is not obtained.

In addition, there is a problem in that the configuration of the display device is complicated, resulting in poor productivity and assemblability, and inferior defects in the manufacturing process.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and an object of the present invention is to provide a display device capable of effectively supplying a driving voltage and a common voltage.

In accordance with an aspect of the present invention, a display device includes a display substrate including a first voltage pad, a second voltage pad, a third voltage pad, and a fourth voltage pad, the first voltage pad, and the second voltage pad. An encapsulation substrate including a first connection portion and a second connection portion electrically connected to each other, a connection wiring connecting the first connection portion and the second connection portion, the display substrate and the encapsulation substrate, and the third voltage. And a conductive sealant electrically connecting the pad and the fourth voltage pad.

The conductive sealant may be made of a sealant and a conductive material.

The display substrate may further include an organic light emitting diode, a driving circuit driving the organic light emitting diode, and a passivation layer covering the organic light emitting diode and the circuit forming layer, wherein the organic light emitting diode includes a common electrode. And the circuit forming layer may include a driving voltage line.

The second voltage pad may be electrically connected to one of the driving voltage line and the common electrode, and the fourth voltage pad may be electrically connected to the other of the driving voltage line and the common electrode.

The apparatus may further include a power supply electrically connected to the first voltage pad and the third voltage pad.

The power supply unit may transfer any one of a driving voltage and a common voltage to the first voltage pad, and may transfer the other of the driving voltage and the common voltage to the third voltage pad.

The third voltage pad, the fourth voltage pad, and the passivation layer may have a non-overlapped region.

The conductive sealant may be disposed on the passivation layer, the third voltage pad, and the fourth voltage pad.

The first voltage pad and the second voltage pad may be covered with the passivation layer to be insulated from the conductive sealant.

The first voltage pad and the third voltage pad are formed at one edge of the display substrate, the second voltage pad is formed at the other edge adjacent to one edge of the display substrate, and the fourth voltage pad is The display substrate may be formed at the other edge facing the one edge of the display substrate.

The third voltage pad and the fourth voltage pad may be opposite to both edges of the display substrate facing each other with the passivation layer therebetween.

The display device may further include a first connection member connecting the first voltage pad and the first connection part, and a second connection member connecting the second voltage pad and the second connection part.

Accordingly, the display device can supply the driving voltage and the common voltage effectively.

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.

In the accompanying drawings, an organic light emitting display (OLED) is illustrated as a display device.

In addition, in the accompanying drawings, active driving of a 2Tr-1Cap structure having two thin film transistors (TFTs) and one capacitor (capacitor) in one pixel (referring to a minimum unit for displaying a screen) Although an active matrix (AM) type organic light emitting display device is illustrated, the present invention is not limited thereto. Accordingly, the display device may include three or more thin film transistors and two or more capacitors in one pixel, and may be formed to have various structures by further forming additional wirings.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In addition, in the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a portion of a layer, film, region, plate, or the like is said to be "on" or "on" another portion, this includes not only when the other portion is "right over" but also when there is another portion in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

1 illustrates a layout view of the display device 900. 2 illustrates a third voltage pad 183 along the line II-II of FIG. 1. 3 illustrates the fourth voltage pad 184 along the line III-III of FIG. 1. FIG. 4 illustrates the first voltage pad 181 along the line IV-IV of FIG. 1. FIG. 5 illustrates the second voltage pad 182 along the line VV of FIG. 1.

The display device 900 includes a display substrate 100, an encapsulation substrate 200, and a conductive sealant 400. The display device 900 further includes a driving integrated circuit chip 800 and a power supply 700.

The display substrate 100 may include the first substrate member 110, the driving circuit unit 120, the organic light emitting diode 130, the passivation layer 150, and the plurality of voltage pads 181, 182, 183, 184).

The first substrate member 110 refers to a transparent insulating substrate made of glass, quartz, ceramic, or plastic. When the substrate member 110 is formed of a flexible material, the utilization range of the display device 900 is widened, and thus the usability of the display device 900 can be further increased.

Although not illustrated, the driving circuit unit 120 includes various thin film wirings including a gate line, a data line, a driving voltage line 125, and the like, thin film transistors and power storage elements connected to the thin film wirings. Here, the driving voltage line 125 is connected to the source electrode of the driving thin film transistor.

Although not illustrated, the organic light emitting element 130 includes a positive electrode connected to the thin film transistor of the driving circuit unit 120, an organic layer formed on the anode, and a negative electrode formed on the organic layer. The anode becomes a hole injection electrode and the cathode becomes an electron injection electrode. Therefore, holes and electrons are injected into the organic layer from the anode and the cathode, respectively. When the exciton, in which the injected holes and electrons combine, falls from the excited state to the ground state, light emission occurs. Hereinafter, the cathode of the organic light emitting element 130 is referred to as a common electrode 135. In addition, the anode of the organic light emitting element 130 is connected to the drain electrode of the driving thin film transistor.

The passivation layer 150 covers and protects the organic light emitting element 130 and the driving circuit unit 120. In addition, the protective film 150 prevents the conductive sealant 400 from being unnecessarily connected to the organic light emitting element 130 and the driving circuit unit 120.

The plurality of voltage pads includes a first voltage pad 181, a second voltage pad 182, a third voltage pad 183, and a fourth voltage pad 184.

The first voltage pad 181 and the third voltage pad 183 are electrically connected to the power supply 700. The power supply unit 700 transmits one of the driving voltage and the common voltage to the first voltage pad 181, and transfers the other of the driving voltage and the common voltage to the third voltage pad 183.

The second voltage pad 182 is electrically connected to any one of the driving voltage line 125 and the common electrode 135, and the fourth voltage pad 184 is one of the driving voltage line 125 and the common electrode 135. Is electrically connected to the other.

In one embodiment according to the present invention, the first voltage pad 181 receives a common voltage from the power supply 700, and the third voltage pad 183 receives a driving voltage from the power supply 700. In addition, the second voltage pad 182 is connected to the common electrode 135 and the fourth voltage pad 184 is connected to the driving voltage line 125.

In addition, the first voltage pad 181 and the second voltage pad 182 are covered with the protective layer 150 to be insulated from the conductive sealant 400. The third voltage pad 183, the fourth voltage pad 184, and the passivation layer 150 have non-overlapping inverses. That is, the passivation layer 150 is exposed without covering the third voltage pad 183 and the fourth voltage pad 184, and the conductive sealant 400 may be formed with the third voltage pad 183 and the fourth voltage pad 184, respectively. Connected. Therefore, the third voltage pad 183 and the fourth voltage pad 184 are electrically connected by the conductive sealant 400.

In addition, the first voltage pad 181 and the third voltage pad 183 are formed at one edge of the display substrate 100, and the second voltage pad 182 is adjacent to one edge of the display substrate 100. The fourth voltage pad 184 is formed at an edge and is formed at the other edge of the display substrate 9100 opposite to one edge of the display substrate 9100. That is, the third voltage pad 183 and the fourth voltage pad 184 are disposed at both edges of the display substrate 100 facing each other with the passivation layer 150 therebetween.

The encapsulation substrate 200 covers the display substrate 100. The encapsulation substrate 200 includes a second substrate member 210, a first connector 221, a second connector 222, and a connection line 230.

The second substrate member 210 is made of substantially the same material as the first substrate member 110. However, the present invention is not necessarily limited thereto. Therefore, the second substrate member 210 may be any material having excellent moisture resistance. In addition, the second substrate member 210 may not be transparent.

The first connector 221 is electrically connected to the first voltage pad 181, and the second connector 222 is electrically connected to the second voltage pad 182. The connection wire 230 connects the first connector 221 and the second connector 222 to each other. Therefore, the first voltage pad 181 and the second voltage pad 182 of the display substrate 100 are connected to each other through the first connection portion 221, the second connection portion 222, and the connection wiring 230 of the encapsulation substrate 200. Are electrically connected to each other. Therefore, the common voltage transferred from the power supply unit 700 to the first voltage pad 181 is transferred back to the second voltage pad 182 through the first connection unit 221, the second connection unit 222, and the connection line 230. Connected. Accordingly, the common voltage may be efficiently supplied to the display substrate 100.

In addition, the encapsulation substrate 200 may further include an insulating layer 250 covering the first connecting portion 221, the second connecting portion 222, and the connection wiring 230.

As such, the encapsulation substrate 200 covers the display substrate 100 to prevent moisture from penetrating into the organic light emitting element 130, and also serves to transfer a common voltage.

In addition, the display device 900 further includes a first connection member 751 and a second connection member 752. The first connection member 751 connects the first voltage pad 181 and the first connection portion 221, and the second connection member 752 connects the second voltage pad 182 and the second connection portion 222. do.

As the first connection member 751 and the second connection member 752, a flexible printed circuit (FPC) may be used. In addition, the first connection member 751 and the second connection member 752 may be formed using an anisotropic conductive film (ACF) 760, respectively, for the first voltage pad 181, the first connection portion 221, and the first connection member 752. 2 is connected to the voltage pad 182 and the second connector 222.

The power supply 700 is connected to one side of the display substrate 100, that is, the edge where the first voltage pad 181 and the third voltage pad 183 are formed. The power supply unit 700 includes a voltage generator that generates various voltages, and a circuit for generating the voltage is mounted. The power supply unit 700 is folded to the back of the portion where the light is emitted to display the image, that is, the encapsulation substrate 200. Therefore, the power supply 700 may be provided in a flexible film form. In addition, the power supply 700 is connected to each other using the first voltage pad 181, the third voltage pad 183, and the anisotropic conductive film 760.

The driving integrated circuit chip 800 is mounted in a chip on glass (COG) manner along an edge of the display substrate 9100. The driving integrated circuit chip 800 supplies a gate signal and a data signal to the driving circuit unit 120.

The conductive sealant 400 bonds and seals the display substrate 100 and the encapsulation substrate 200. In addition, the conductive sealant 400 electrically connects the third voltage pad 183 and the fourth voltage pad 184. Therefore, the driving voltage transferred from the power supply unit 700 to the third voltage pad 183 is transferred back to the fourth voltage pad 184 through the conductive sealant 400. Thus, the driving voltage can be efficiently supplied to the display substrate.

The conductive sealant 400 is made by adding a conductive material to a conventional encapsulant. Although the electrical conductivity of the conductive sealant 400 is relatively low, it is possible to overcome the low electrical conductivity by increasing the area in contact with the third voltage pad 183 and the fourth voltage pad 184.

By such a configuration, the display device 900 can be supplied with the driving voltage and the common voltage effectively. That is, a printed circuit board is attached to each edge of the display substrate 100 to supply a driving voltage and a common voltage to the display substrate 100, or a wiring for transferring the driving voltage and the common voltage to the edge of the display substrate 100. Need not be complicated. This is because the driving voltage and the common voltage can be supplied to the display substrate 100 using the encapsulation substrate 200 and the conductive sealant 400.

In addition, the driving voltage and the common voltage may be uniformly supplied to the driving voltage line 125 and the common electrode 135 of the display substrate 100 to improve luminance uniformity of light generated in the display substrate 100. Thus, the quality of the display device 900 can be improved.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

As described above, the display device according to the present invention can receive the driving voltage and the common voltage effectively.

In addition, the driving voltage and the common voltage may be uniformly supplied to the driving voltage line and the common electrode of the display substrate to improve luminance uniformity of light generated from the display substrate. Thus, the quality of the display device can be improved.

Claims (12)

In a display device, A display substrate including a first voltage pad, a second voltage pad, a third voltage pad, and a fourth voltage pad; An encapsulation substrate including a first connection part and a second connection part electrically connected to the first voltage pad and the second voltage pad, respectively, and a connection wire connecting the first connection part and the second connection part; And a conductive sealant which bonds the display substrate to the encapsulation substrate and electrically connects the third voltage pad and the fourth voltage pad. In claim 1, And the conductive sealant is formed of an encapsulant and a conductive material. In claim 1, The display substrate further includes an organic light emitting diode, a circuit forming layer for driving the organic light emitting diode, and a passivation layer covering the organic light emitting element and the circuit forming layer. The organic light emitting device includes a common electrode, And the circuit forming layer includes a driving voltage line. In claim 3, The second voltage pad is electrically connected to any one of a driving voltage line and a common electrode. And the fourth voltage pad is electrically connected to the other of the driving voltage line and the common electrode. In claim 4, And a power supply electrically connected to the first voltage pad and the third voltage pad. In claim 5, The power supply unit transfers one of a driving voltage and a common voltage to the first voltage pad, and the other of the driving voltage and the common voltage to the third voltage pad. In claim 3, And the non-overlapping region of the third voltage pad, the fourth voltage pad, and the passivation layer. In claim 7, And the conductive sealant is disposed on the passivation layer, the third voltage pad, and the fourth voltage pad. In claim 8, And the first voltage pad and the second voltage pad are covered with the protective layer and insulated from the conductive sealant. In claim 7, The first voltage pad and the third voltage pad are formed at one edge of the display substrate. The second voltage pad is formed on the other side edge adjacent to one edge of the display substrate. And the fourth voltage pad is formed at the other edge of the display substrate opposite to one edge of the display substrate. In claim 10, And the third voltage pad and the fourth voltage pad are disposed at opposite edges of the display substrate facing each other with the passivation layer therebetween. In claim 1, A first connection member connecting the first voltage pad and the first connection portion; And a second connection member connecting the second voltage pad and the second connection portion.

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