KR102542472B1 - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device capable of detecting a defective position of a display panel in advance by applying a voltage to a contact portion between a low potential power supply line and a cathode electrode to allow current to flow, and includes an anode electrode and an organic light emitting layer. and a display panel including an organic light emitting diode including a cathode electrode; a first power source supplying a first voltage; a second power source supplying a second voltage higher than the first voltage; and a switching unit supplying at least one of the first voltage and the second voltage to the cathode electrode.

Description

Organic light emitting display {ORGANIC LIGHT EMITTING DISPLAY DEVICE}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device capable of easily detecting a defect in a contact portion between a low potential supply line and a cathode electrode.

Recently, various flat panel display devices capable of reducing the weight and volume, which are disadvantages of a cathode ray tube (CRT), are being developed. Examples of such a flat panel display include a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting diode display (OLED). : Organic Light Emitting Display).

Among these flat panel display devices, the organic light emitting diode display device is a self-luminous display device that excites organic compounds to emit light. It does not require a backlight used in LCD, so it is lightweight and thin, and has the advantage of simplifying the process. . In addition, the organic light emitting display device is widely used in that it can be manufactured at a low temperature, has a high response speed with a response speed of 1 ms or less, and has characteristics such as low power consumption, wide viewing angle, and high contrast. there is.

The organic light emitting diode display includes organic light emitting diodes that convert electrical energy into light energy. An organic light emitting diode includes an anode electrode, a cathode electrode, and an organic light emitting layer disposed between these electrodes. Holes are injected from the anode electrode and electrons are injected from the cathode electrode. When holes injected through the anode electrode and the cathode electrode are injected into the organic light emitting layer (EML), exciton, which is an exciton, is formed, and the exciton emits light while emitting energy.

Such an organic light emitting diode display includes a plurality of pixels partitioned by intersections of gate lines, data lines, and common power lines. Each pixel includes a switching thin film transistor, a driving thin film transistor, a storage capacitor, and an organic light emitting diode. The switching thin film transistor is turned on when a scan pulse is supplied to the gate line, and supplies the data signal supplied to the data line to the storage capacitor and the gate electrode of the driving thin film transistor. The driving thin film transistor controls the amount of light emitted from the organic light emitting diode by controlling the current supplied to the organic light emitting diode from the power line in response to the data signal supplied to the gate electrode. The storage capacitor supplies data supplied from the data line through the switching thin film transistor to maintain light emission of the organic light emitting diode by supplying a constant current to the driving thin film transistor until the data signal of the next frame is supplied even when the switching thin film transistor is turned off. charge the voltage

Hereinafter, a conventional organic light emitting display device will be described with reference to FIG. 1 .

1 is a cross-sectional view showing a partial area of a conventional organic light emitting display device.

Referring to FIG. 1 , a conventional organic light emitting display device includes a display panel 10, a control PCB 20, a source PCB 22, and a chip on film 24.

The chip-on-film 24 is electrically connected to the pads of the source PCB 22 and the data pads of the display panel 25 . A source integrated circuit (hereinafter referred to as "source IC") (SIC) as a source driving circuit is mounted on the chip-on-film 24 .

Various wires are formed on the source PCB 22 to supply digital video data and timing control signals from the control PCB 20 and power supply voltages required for the display panel.

A control circuit and a data transmission circuit are mounted on the control PCB 20 . This control PCB (20) supplies timing control signals and various power voltages for controlling the operation of the data IC (SIC) along with data to the source IC (SIC) of the source COF (24) through the source PCB (22). do.

In FIG. 1, in order to avoid complicating the drawing, signal lines for supplying timing control signals and data signals, supply lines for supplying high-potential power, and the like are omitted, and the cathode electrode ( Only the low-potential power supply lines VSSL1 to VSSL5 for supplying the low-potential power supply voltage VSS to the CAT are shown.

In a conventional organic light emitting display device, as shown in FIG. 1, the low potential power supply (VSS) passes through the control PCB 20, the source PCB 22, and the source IC to the cathode electrode (CAT) formed on the display panel 10. supplied to

The low potential power supply line for supplying the low potential power supply voltage (VSS) includes a first supply line (VSSL1) formed on the control PCB 20, a third supply line (VSSL3) formed on the source PCB 22, a first The second supply line VSSL2 connecting the supply line VSSL1 and the third supply line VSSL3, the fourth supply line VSSL4 formed on the chip on glass 24, and the fifth supply line formed on the display panel 10 line VSSL5. The low potential power voltage VSS is supplied to the cathode electrode CAT through the first to fifth supply lines VSSL1 to VSSL5.

By the way, the first to fifth supply lines VSSL1 to VSSL5 are formed when the gate line is formed on the display panel 10 of the organic light emitting display device in order to reduce the number of processes, and the cathode electrode CAT is formed after the data line is formed. Since they are formed when forming the organic light emitting diode (OLED), the first to fifth supply lines VSSL1 to VSSL5 and the cathode electrode CAT are formed on different layers. Therefore, in order to connect the first to fifth supply lines VSSL1 to VSSL5 and the cathode electrode CAT to each other, a plurality of contact holes CH must be formed in a layer existing between them.

In this configuration, between the fifth supply line VSSL5 and the cathode electrode CAT, an insulating film covering the fifth supply line VSSL5 is formed on the insulating film and disposed in the display area (active area) of the display panel. A first auxiliary cathode electrode formed on the same layer as the source/drain electrode of the thin film transistor, a passivation film covering the first auxiliary cathode electrode, an overcoat layer positioned on the passivation film for planarization, and a pixel electrode disposed on the overcoat layer. A second auxiliary cathode electrode formed on the same layer as is disposed. In the contact area between the fifth supply line VSSL5 and the cathode electrode CAT, the first auxiliary cathode electrode is connected to the fifth supply line VSSL5 through a through hole penetrating the interlayer insulating film, and the fifth supply line VSSL5 The passivation film and the overcoat layer are removed to directly connect the first auxiliary electrode and the second auxiliary electrode, and the cathode electrode is disposed on the second auxiliary electrode.

However, when the cathode electrode is disposed on the second auxiliary electrode, the contact between the second auxiliary electrode and the overcoat layer is not good, resulting in a void. When the material for formation permeates, the thickness of the cathode electrode becomes thin.

Accordingly, there is a problem in that current density increases in the contact portion between the fifth supply line VSSL5 and the cathode electrode CAT having a reduced thickness, resulting in a temperature increase. That is, when there is a normal portion and a thinned portion at the location where the fifth supply line VSSL5 and the cathode electrode are in contact, current is concentrated on the side where the resistance of the cathode electrode CAT is low, resulting in overcurrent. Since it flows, there is a problem in that the temperature rises due to overcurrent at a position where the resistance is low.

As such, there is no way to know the possibility of occurrence of the above-mentioned problem at the contact position between the fifth supply line VSSL5 and the cathode electrode CAT without destructive analysis of the display panel, so it is difficult to verify the defect of the display panel in advance. There was a problem that was difficult.

Accordingly, the present invention is to solve the above-described problems, and organic light emitting diodes capable of detecting a defective position of a display panel in advance by applying a voltage to a contact part of a low potential power supply line and a cathode electrode to allow current to flow. Its purpose is to provide a display device.

An organic light emitting display device of the present invention for achieving the above object includes a display panel including an organic light emitting diode including an anode electrode, an organic light emitting layer, and a cathode electrode; a first power source supplying a first voltage; a second power source supplying a second voltage higher than the first voltage; and a switching unit supplying at least one of the first voltage and the second voltage to the cathode electrode.

In the configuration, the organic light emitting display device includes a plurality of first power sources formed in the non-display portion of the display panel and supplying the first voltage to a plurality of first contact portions positioned in a partial region of one end of the cathode electrode. voltage supply lines; and supplying the second voltage to a plurality of second contact portions formed in the non-display portion of the display panel and positioned in a remaining area adjacent to a partial area of one end of the cathode electrode, or supplying the first voltage to the plurality of second contact portions. It may further include a plurality of second power supply voltage supply lines supplying the second contact parts.

Also, when the display of the display panel is driven, the switching unit is connected to the first power supply to supply the first voltage to the plurality of first contact parts and the plurality of second contact parts, and the display panel is abnormal. In the detection mode, the switching unit is connected to the second power supply, supplies the first voltage to the plurality of first contact parts, and supplies the second voltage to the plurality of second contact parts to determine the partial area and A current path may be formed by generating a voltage difference between the remaining regions.

In addition, the organic light emitting display device according to the present invention includes at least one first source connected to the plurality of first power supply voltage supply lines and sensing current of the plurality of first contact portions when the current path is formed. The data driver may further include an IC and at least one second source IC connected to the plurality of second power supply lines and sensing currents of the plurality of second contact units.

In addition, the organic light emitting display device according to the present invention includes a plurality of first and second power supply voltage supply lines disposed parallel to each other on the substrate of the display panel; The plurality of first and second power voltage supply lines are disposed on an insulating film covering the plurality of first and second power voltage supply lines, and through a plurality of contact holes exposing the plurality of first and second power voltage supply lines, respectively. a first auxiliary cathode electrode connected to power voltage supply lines; a passivation layer and an overcoat layer sequentially covering the first auxiliary cathode electrode; a second auxiliary cathode electrode disposed on a portion of the first auxiliary cathode electrode and the passivation film and the overcoat layer exposed through an opening in which portions of the passivation film and the overcoat layer are removed; and the second auxiliary cathode electrode and the cathode electrode disposed on the overcoat layer.

According to the organic light emitting display device according to the present invention, a first low potential power supply voltage and a second low potential power supply voltage are supplied to two regions of a cathode electrode to form a current path, and a current path is formed between lines to which power is supplied and the cathode electrode. Since it is possible to determine the location of the contact portion where an error has occurred by measuring the current density of the contact location, an effect of significantly reducing the defect rate of the organic light emitting display device can be obtained.

1 is a plan view showing a part of a conventional organic light emitting display device;
2 is a schematic block diagram of an organic light emitting display device according to an embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram schematically showing one pixel area of the display panel of the organic light emitting display device shown in FIG. 2;
4 is a plan view showing a partial area of an organic light emitting display device according to an embodiment of the present invention;
5 is a cross-sectional view showing a partial area of FIG. 4;
6 is a diagram for explaining a path of a current supplied to a cathode electrode of an organic light emitting display device in a normal mode (display driving);
7 is a diagram for explaining a path of a current supplied to a cathode electrode of an organic light emitting display device in an abnormal part detection mode;

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, component names used in the following description may be selected in consideration of ease of writing specifications, and may be different from names of parts of actual products.

Hereinafter, an organic light emitting display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 2 and 3 .

2 is a schematic block diagram of an organic light emitting display device according to an embodiment of the present invention, and FIG. 3 is an equivalent circuit diagram schematically showing one pixel area of a display panel of the organic light emitting diode display shown in FIG. 2 am.

2 and 3 , the organic light emitting display device according to the present invention provides timing signals to a display panel DP, a data driver DD disposed on one side of the display panel DP, and the data driver DD. a timing controller TC, a gate driver GD disposed on the other side of the display panel DP, and a high potential voltage line ELVDD and a low potential voltage line ELVSS supplying power to the display panel DP. can include

The data driver DD has a source IC (SIC) mounted thereon, one side of which is connected to one end of the source printed circuit board (DPCB), and the other side of the chip-on-film (COF) attached to one end of the display panel (DP). include

The data driver DD converts the digital video data RGB input from the timing controller TC into an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driver DD is supplied to the data lines DL.

The gate driver GD includes a gate IC GIC and sequentially supplies gate pulses synchronized with the data voltage to the gate lines GL to select pixels of the display panel DP to which the data voltage is written.

The timing controller TC inputs timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a data enable signal (Data Enable, DE), and a main clock (MCLK) input from the host system (HS). and synchronize the operation timings of the data driver (DD) and the gate driver (GD). The data timing control signal for controlling the data driver DD includes a source sampling clock (SSC), a source output enable signal (SOE), and the like. The gate timing control signal for controlling the gate driver GD includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (Gate Output Enable (GOE)), and the like. include The timing controller TC may be mounted on a control PCB (CPCB).

The host system HS may be implemented as any one of a television system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. . The host system HS converts digital video data RGB of an input image into a format suitable for display on the display panel DP by including a system on chip (SoC) having a built-in scaler. The host system HS transmits timing signals Vsync, Hsync, DE, and MCLK together with digital video data to the timing controller TC.

The pixel array of the display panel DP includes pixels defined by intersections of data lines DL and gate lines GL. Each of the pixels includes an organic light emitting diode (OLED), which is a self light emitting device.

Referring to FIG. 3 , a plurality of data lines DL and a plurality of gate lines GL cross each other on the display panel DP, and pixels are arranged in a matrix form at each intersection. Each pixel includes an organic light emitting diode (OLED), a driving thin film transistor (hereinafter referred to as TFT) (DT) that controls the amount of current flowing through the organic light emitting diode (OLED), and a voltage between the gate and source of the driving TFT (DT). It includes a programming unit (SC) for setting.

The programming unit SC may include at least one switching unit TFT and at least one storage capacitor.

The switching unit TFT is turned on in response to a scan signal from the gate line GL, thereby applying a data voltage from the data line DL to one electrode of the storage capacitor.

The driving TFT DT adjusts the amount of light emitted from the organic light emitting diode OLED by controlling the amount of current supplied to the organic light emitting diode OLED according to the level of the voltage charged in the storage capacitor. The amount of light emitted from the organic light emitting diode (OLED) is proportional to the amount of current supplied from the driving TFT (DT).

Each pixel is connected to a high-potential power supply voltage source (VDD) and a low-potential power supply voltage source (VSS), and receives a high-potential power supply voltage and a low-potential power supply voltage from a power generator (not shown), respectively.

The TFTs constituting the pixel may be implemented as p-type or as n-type. In addition, the semiconductor layers of the TFTs constituting the pixel may include amorphous silicon, polysilicon, or oxide. The organic light emitting diode (OLED) includes an anode electrode (ANO), a cathode electrode (CAT), and an organic light emitting layer (not shown) interposed between the anode electrode (ANO) and the cathode electrode (CAT). The anode electrode ANO is connected to the driving TFT DT. The organic light emitting layer includes an emission layer (EML), a hole injection layer (HIL) and a hole transport layer (HTL) and an electron transport layer (ETL) with the light emitting layer interposed therebetween. An electron injection layer (EIL) may be disposed.

Next, referring to FIGS. 4 and 5 , an organic light emitting display device capable of detecting a defective position of a display panel according to an exemplary embodiment of the present invention will be described in more detail.

4 is a plan view illustrating a partial area of an organic light emitting display device according to an exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating a partial area of FIG. 4 .

First of all, referring to FIG. 4 , an organic light emitting display device according to an embodiment of the present invention includes a display panel (DP), a control PCB (CPCB), a source PCB (SPCB), and a chip-on-film (COF).

The chip-on-film (COF) is electrically connected to pads of the source PCB (SPCB) and pads of the display panel (DP). A source integrated circuit (hereinafter referred to as "source IC") (SIC) as a data driving circuit is mounted on the chip-on-film 24 .

Various wires are formed on the source PCB (SPCB) to supply digital video data and timing control signals from the control PCB (CPCB) and power supply voltage required for the display panel.

A control circuit for controlling the display panel and a data transmission circuit for supplying video data to the display panel are mounted on the control PCB (CPCB). This control PCB (CPCB) transmits video data, timing control signals for controlling the operation of the source IC (SIC) and various power voltages to the source IC (SIC) mounted on the chip-on-film (COF) through the source PCB (SPCB). ) to supply

In FIG. 4, in order to avoid complicating the drawing, signal lines for supplying timing control signals and data signals, and high-potential power voltage supply lines for supplying high-potential power are omitted, and the organic light emitting display device First supply lines VSSL11 to VSSL15 and second supply lines VSSL21 to supply at least one of the first low-potential power source VSS1 and the second low-potential power source VSS2 to the cathode electrode CAT of Only VSSL25) is shown.

In FIG. 4 , the first low potential power supply VSS1 and the second low potential power supply VSS2 are illustrated as being provided on the control PCB CPCB, but the present invention is not limited thereto, and the first low potential power supply VSS1 ) and the second low-potential power source VSS2 may be separately provided externally. In addition, the first supply lines VSSL11 to VSSL15 and the second supply lines VSSL21 to VSSL25 are also supplied from the first low-potential power supply VSS1 and the second low-potential power supply VSS2 to the cathode electrode CAT. Since this is just one example to show the current path and can be implemented in various ways, the present invention is not limited thereto. Accordingly, it should be understood that the present invention is not limited to the embodiment shown in FIG. 4 .

Next, referring to FIGS. 4 and 5, the control PCB (CPCB) includes a first low-potential power supply VSS1 supplying the first low-potential power supply voltage VSS1 and a voltage higher than the first low-potential power supply voltage VSS1. A second low potential power source VSS2 supplying a second low potential power source voltage VSS2 and at least one of the first low potential power source voltage VSS1 and the second low potential power source voltage VSS2 are connected to the display panel ( A switching unit (SW) for supplying to the cathode electrode (CAT) formed on the DP is provided.

In the organic light emitting display device according to the embodiment of the present invention, the first low potential power supply voltage VSS1 is transmitted from the control PCB CPCB through the first source PCB SPCB1 and at least one first source IC SIC1. The second source PCB (SPCB2) and at least one second source IC (SIC2) are supplied to the first contact portion CT1 of the cathode electrode (CAT) formed on the display panel (DP) or by the switching unit (SW). ) is supplied to the second contact portion CT2 of the cathode electrode CAT formed on the display panel DP.

The first low potential power supply line for supplying the first low potential power supply voltage VSS1 includes the 1-1 supply line VSSL11 formed on the control PCB CPCB and the first low potential power supply line formed on the first source PCB SPCB1. -3 supply line (VSSL13), the 1-2 supply line (VSSL12) connecting the 1-1 supply line (VSSL11) and the 1-3 supply line (VSSL13), the 1- 4 supply lines VSSL14 and 1-5 supply lines VSSL15 formed on the display panel DP. The 1-4 supply lines VSSL14 formed on the chip-on-glass COF can sense the amount of current of the first contact portions CT1 of the cathode electrode CAT connected to the 1-5 supply lines VSSL15 to be described later. connected to an analog-to-digital converter (not shown) of the first source IC (SIC1).

The first and second low potential power supply lines for supplying the first low potential power supply voltage (VSS1) or the second low potential power supply voltage (VSS2) are the 2-1st supply line (VSSL21) formed on the control PCB (CPCB). ), the 2-3 supply line VSSL23 formed on the second source PCB (SPCB2), and the 2-2 supply line connecting the 2-1 supply line VSSL21 and the 2-3 supply line VSSL23 ( VSSL22), 2-4 supply lines VSSL24 formed on the chip-on-glass (COF), and 2-5 supply lines VSSL25 formed on the display panel DP. The 2-4th supply line VSSL24 formed on the chip-on-glass COF can sense the amount of current of the second contact portions CT2 of the cathode electrode CAT connected to the 2-5th supply line VSSL25 to be described later. connected to the analog-to-digital converter of the second source IC (SIC2).

The plurality of first to fifth supply lines VSSL15 are respectively connected to the plurality of first contact portions CT1 of the cathode electrode CAT formed in the non-display portion of the display panel DP. The plurality of first contact portions CT1 are disposed in the first contact area CA1, which is a partial area of one end of the cathode electrode CAT.

The plurality of second to fifth supply lines VSSL25 are respectively connected to the plurality of second contact portions CT2 of the cathode electrode CAT formed in the non-display portion of the display panel DP. The plurality of second contact portions CT2 are disposed in the second contact area CA2, which is the remaining area of one end of the cathode electrode CAT, and are disposed adjacent to the first contact area CA1.

Next, referring to FIG. 5 , a contact relationship between the plurality of 1-5 supply lines VSSL15 and the plurality of first contact parts CT1 of the cathode electrode CAT will be described in more detail. Since the contact relationship between the plurality of 2-5 supply lines VSSL25 and the plurality of second contact parts CT2 of the cathode electrode CAT is substantially the same as in FIG. Only the part related to the 5 supply lines VSSL15 will be described, and the description of the part related to the plurality of second to fifth supply lines VSSL25 will be omitted.

FIG. 5 is a cross-sectional view showing a partial area of FIG. 4 , that is, a plurality of first connection areas CA1 of the plurality of first to fifth supply lines VSSL15 and the cathode electrode CAT.

Referring to FIG. 5 , a buffer layer BUF is disposed on a substrate SUB of an organic light emitting display device according to an embodiment of the present invention, and a plurality of first to fifth supply lines VSSL15 are disposed on the buffer layer BUF. are placed side by side

An insulating layer ILD is stacked on the plurality of 1-5 supply lines VSSL15 to cover them.

A first auxiliary cathode electrode is formed on the insulating layer ILD to form a plurality of first contact portions CT1 to which the plurality of first to fifth supply lines VSSL15 are respectively connected through the plurality of first contact holes CH1. (ACATA) is placed.

A passivation film (PAS) covering the first auxiliary cathode electrode (ACATA) and an overcoat layer (OC) for planarizing the passivation film (PAS) are sequentially stacked. The passivation layer PAS and the overcoat layer OC have an opening OP exposing the first auxiliary cathode electrode ACATa.

A second auxiliary cathode electrode ACATb is formed on the overcoat layer OC to contact the first auxiliary cathode electrode ACATa exposed through the opening.

The cathode electrode CAT of the organic light emitting diode is disposed on the second auxiliary cathode electrode ACATb and the overcoat layer OC.

According to the configuration described above, the plurality of first to fifth supply lines VSSL15 are located within the first contact area CA1 via the first auxiliary cathode electrode ACATa and the second auxiliary cathode electrode ACATb. Each is connected to the first contact portions CT1 of the cathode electrode CAT.

In addition, although not shown in FIG. 5 , similar to the plurality of 1-5 supply lines VSSL15 , the plurality of 2-5 supply lines VSSL25 are connected to the first auxiliary cathode electrode ACATA and the second auxiliary cathode. Each is connected to the second contact portions CT1 of the cathode electrode CAT located in the second contact area CA2 via the electrode ACATb.

In FIG. 5 , it is shown that one 1st to 5th supply line VSSL15 is connected to the first auxiliary cathode electrode ACATa through one contact hole CH1, but in reality, through a plurality of contact holes 1 can be connected to the auxiliary cathode electrode (ACATA).

Next, referring to FIGS. 6 and 7 , the current supplied to the cathode electrode of the organic light emitting display device in the normal mode (ie, display driving) and the abnormal part detection mode will be described.

6 is a diagram for explaining a path of a current supplied to a cathode electrode of an organic light emitting display device in a normal mode (ie, display driving), and FIG. It is a diagram for explaining the path of the supplied current.

Referring to FIG. 6 , in a normal mode (ie, display driving), the switching unit SW is switched to node a. Accordingly, the first low-potential power supply voltage VSS1 is connected to the 1-1 supply line VSSL11. Since the 1-1 supply line VSSL11 is connected to the 1-2 to 1-5 supply lines VSSL12 to VSSL15, the first low-potential power supply voltage VSS1 is supplied to the 1-1 to 1-5 supply lines. It is supplied to the first contact parts CT1 of the cathode electrode CAT through the lines VSSL11 to VSSL15.

In addition, the first low-potential power supply voltage VSS1 is connected to the 2-1 supply line VSSL21. Since the 2-1st supply line VSSL21 is connected to the 2-2nd to 2-5th supply lines VSSL22 to VSSL25, the first low potential power voltage VSS1 is supplied to the 2-1st to 2-5th supply lines. It is supplied to the second contact portions CT2 of the cathode electrode CAT through the lines VSSL21 to VSS215. A uniform first low-potential power voltage VSS1 is supplied to the first and second connection parts CT1 and CT2 of the cathode electrode CAT so that a normal display operation is possible.

Referring to FIG. 7 , in the abnormal part detection mode, the switching unit SW is switched to node b. Accordingly, the first low-potential power supply voltage VSS1 is connected to the 1-1 supply line VSSL11. Since the 1-1 supply line VSSL11 is connected to the 1-2 to 1-5 supply lines VSSL12 to VSSL15, the first low-potential power supply voltage VSS1 is supplied to the 1-1 to 1-5 supply lines. It is supplied to the first contact parts CT1 of the cathode electrode CAT through the lines VSSL11 to VSSL15.

Meanwhile, the second low-potential power supply voltage VSS2 is connected to the 2-1 supply line VSSL21. Since the 2-1st supply line (VSSL21) is connected to the 2-2nd to 2-5th supply lines (VSSL22 to VSSL25), the second low-potential power supply voltage having a higher level than the first low-potential power supply voltage (VSS1) (VSS1) is supplied to the second contact portions CT2 of the cathode electrode CAT through the 2-1st to 2-5th supply lines VSSL21 to VSS215.

Therefore, the voltage difference between the second low potential power supply voltage VSS2 and the first low potential power supply voltage VSS1 is between the first contact parts CT1 and the second contact parts CT2 of the cathode electrode CAT. A current is generated and current flows from the second contact area CA2 of the cathode electrode CAT to the first contact area CA1, so that the 2-1 to 2-5 supply lines VSSL21 to VSSL25, the cathode A current path is formed by the second contact area CA2 of the electrode CAT, the first contact area CA1, and the 1-5th to 1-2th supply lines VSSL15 to VSSL11.

Since the 1-4 supply lines VSSL14 are connected to at least one first source IC SIC1, the first source IC SIC1 is connected to the 1-4 supply lines VSSL14 and the 1-5 supply lines. The plurality of first contact parts CT1 connected through VSSL15 can be sensed. Therefore, for example, since it is possible to determine the location of the first contact portion where an error occurs by determining whether the current density of the first contact portions CT1 is increased, the defect rate of the organic light emitting display device can be significantly reduced. effect can be obtained.

In addition, since the 2-4 supply lines VSSL24 are connected to at least one second source IC SIC2, the second source IC SIC2 is connected to the 2-4 supply lines VSSL24 and the 2-5 supply lines VSSL24. The plurality of second contact parts CT2 connected through the supply lines VSSL25 can be sensed. Therefore, for example, by determining whether the current density of the second contact parts CT2 is increased, it is possible to determine the position of the second contact part where the error occurs, thereby significantly reducing the defect rate of the organic light emitting display device. effect can be obtained.

As described above, according to the organic light emitting display device according to an embodiment of the present invention, even if the contact positions of the 1-5th and 2-5th supply lines VSSL15 and VSSL25 and the cathode electrode CAT are not individually destructively analyzed. Since the defect of the display panel can be verified in advance, an effect of significantly reducing the defect rate of the display panel can be obtained.

Through the above description, those skilled in the art will be able to make various changes and modifications without departing from the spirit of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be defined by the claims.

CAT: cathode electrode CA1, CA2: contact area
CT1, CT2: Contact part CH1, CH2: Contact hole
SIC1, SIC2: Source IC SW: Switching part
VSS1: first low potential power supply voltage VSS2: second low potential power supply voltage

Claims (5)

a display panel including an organic light emitting diode including an anode electrode, an organic light emitting layer, and a cathode electrode having first and second regions adjacent to each other at one end thereof;
a first power supply supplying a first low potential voltage to a first region of the cathode electrode through a first contact;
a second power source supplying a second low potential voltage higher than the first low potential voltage to a second region of the cathode electrode through a second contact portion disposed adjacent to the first contact portion; and
supplying the first low potential voltage to the first and second contact portions during display driving of the display panel, and supplying the first low potential voltage to the first contact portion during an abnormal detection mode of the display panel; and a switching unit supplying the second low potential voltage to a second contact to form a current path generating a voltage difference between the first contact and the second contact.
According to claim 1,
a first power voltage supply line formed in the non-display portion of the display panel and supplying the first low potential voltage to the first contact portion; and
and a second power supply voltage supply line formed in the non-display portion of the display panel and supplying the second low potential voltage to the second contact portion or supplying the first low potential voltage to the second contact portion. light emitting display.
delete According to claim 2,
When the current path is formed, a first source IC connected to the first power voltage supply line to sense the current of the first contact portion and a first source IC connected to the second power voltage supply line to sense the current of the second contact portion An organic light emitting display device further comprising a data driver having a second source IC for sensing.
According to claim 2 or 4,
the first and second power voltage supply lines disposed parallel to each other on the substrate of the display panel;
It is disposed on an insulating film covering the first and second power voltage supply lines and is connected to the first and second power voltage supply lines through contact holes exposing the first and second power voltage supply lines, respectively. a first auxiliary cathode electrode;
a passivation layer and an overcoat layer sequentially covering the first auxiliary cathode electrode;
a second auxiliary cathode electrode disposed on a portion of the first auxiliary cathode electrode and the passivation film and the overcoat layer exposed through an opening in which portions of the passivation film and the overcoat layer are removed; and
An organic light emitting display device comprising the second auxiliary cathode electrode and the cathode electrode disposed on the overcoat layer.

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