KR100870615B1 - Organic electroluminescence panel and method for detecting faill thereof - Google Patents

Abstract

An organic EL panel and a defect inspection method thereof according to the present invention are disclosed, and an organic EL panel is designed so that an anode line of an organic EL panel can be separated into R, G, and B colors, and voltages can be applied separately.

The organic EL panel includes a plurality of cathode lines arranged side by side at a predetermined interval, a plurality of cathode partition walls electrically separating each of the cathode lines, and a plurality of anode lines and a plurality of anode lines arranged at right angles to the cathode line. The test pads may be separately separated, and anode lines may be commonly connected to each color to separately apply voltages.

Thus, cell-specific defect states such as cathode bulkheads, anode line patterns, and organic light emitting diode defects can be easily inspected using voltage sources and multimeters, without the need for separate connections and test devices before aging. It has an effect.

Description

Organic electroluminescent panel and method for detecting faill

1 is a layout of a conventional organic EL panel.

2 is a layout of an organic EL panel according to a preferred embodiment of the present invention.

3 is a cross-sectional view showing a III-III cross section in the plan view of FIG.

4 is an equivalent circuit diagram of a panel when a voltage is applied only to a green (G) anode among anode lines.

5A and 5B are detailed equivalent circuit diagrams of portion V of FIG. 4;

6 is a layout of an organic EL panel according to another embodiment of the present invention.

The present invention relates to an organic electroluminescence (EL) panel, and more particularly, by separating the anode pads of the organic EL panel into R, G, and B, and applying a test voltage separately, the process failure state of the cell can be measured. The present invention relates to an organic EL panel and a defect inspection method thereof.

Organic EL panels have advantages such as low voltage driving, high luminous efficiency, wide viewing angle, and fast response speed, and thus, technology development is actively progressing as one of the next-generation flat panel display technologies capable of displaying high quality video.

The organic EL device is composed of a structure having an organic thin film layer between an anode, which is a transparent electrode such as ITO, and a cathode using a metal having a low work function (Ca, Li, Al: Li, Mg: Ag, etc.).

When a forward voltage is applied to the organic EL device, holes and electrons are injected from the anode and the cathode, respectively, and the injected holes and electrons combine to form excitons, and excitons are recombined. recombination) to cause electroluminescence.

By the way, the organic electroluminescent panel may generate | occur | produce a defect in a cell in the manufacturing process, and may not emit light properly. Therefore, a test has conventionally been made in the following manner to check for such defects.

Referring to Fig. 1, in the conventional organic EL panel, a plurality of cathode lines 11-17 are arranged in rows at regular intervals, and one end thereof is common at the outside of the scribing line 40. Is connected to the test pad. Between each cathode line 11-17 is separated by cathode partition walls 21-28, respectively. Each cathode line 11-17 is connected to an electrode by a contact 41. In addition, the anode lines 31-36 are arranged in a column to intersect the cathode lines 11-17, and one end of the scribing line 40 is connected to the test pad in common. .

Here, the inside of the seal-line 42 is the area where the actual organic EL panel is formed, and the area where the actual screen appears is the area of the active array 43.

The organic EL panel of FIG. 1 is manufactured including test pads. After the test is completed, the outer region of the scribing line 40 is cut, and the inner region is used for production.

In the conventional organic EL panel of Fig. 1, the anode lines 31-36 and the cathode lines 11-17 are connected in common in one direction, respectively. Therefore, if a problem such as electrical insulation occurs between the anode lines 31-36 and the cathode lines 11-17 due to an error in the process, the overall operation state is determined by applying a voltage to commonly connected pads. Defects can be detected.

However, the above-described overall operation state does not know a specific reason for each cell, for this purpose, there is a problem in that it is necessary to perform a separate inspection equipment and a complex inspection process, and the inspection cost and inspection time.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is an organic, which can be easily inspected by using a color-specific individual test pad connected to the ends of the anode lines as a voltmeter and an ammeter, which may occur in an organic EL panel. It is to provide an EL light emitting panel.

The present invention for achieving the above object is a drive cell is formed in the active region of the organic EL panel, each extending end of the cathode lines formed in the cells are connected in common to form a cathode test pad, the anode formed in the cells An extended end of the anode line corresponding to at least one color of the lines is commonly connected to the color-specific test pad.

Here, a contact may be formed at an extended end of the anode line for each color, and a test pattern extending to the test pad may be electrically connected to each anode line corresponding to the same color through the contact.

In addition, a separator may be formed between test patterns corresponding to each color.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a plan view showing the layout of an organic EL panel according to a preferred embodiment of the present invention.

Referring to FIG. 2, anode lines 31 to 36 are arranged in a column, and each anode line 31 to 36 is in the order of colors such as red (R), green (G), and blue (B). Are arranged. The extending ends of the anode lines 31 to 36 of the same color are connected to the patterns connected to the test pads 44 to 46 of the corresponding color through corresponding contacts, respectively.

The area inside the seal-line 42 is the area where the actual organic EL panel is formed, and the area where the actual screen appears is the area of the active array 43.

On the other hand, the plurality of cathode lines 11 to 17 are arranged side by side at regular intervals intersecting the anode lines 31 to 36, and the gaps between the cathode lines are separated by the cathode partitions 21 to 28, respectively.

The odd-numbered cathode lines 11, 13, 15, and 17 of the plurality of cathode lines 11 to 17 are commonly connected at one end at the outer edge of the scribing line 40 to form a pad 100a. The even-numbered cathode lines 12, 14, and 16 are connected at one end in common to form pads 100b. These pads 100a and 100b are designed after scribing the organic substrate. 3 is a cross-sectional view taken along the line III-III in the plan view of FIG. 2, wherein an insulating film 20 is formed on each of the anode lines 31 to 36, and the test pad 46 is common to the insulating film 20. The connected test pattern 10 is formed, and the test pattern 10 commonly connected to the test pad 46 is commonly connected to the anode lines 33 and 36 of the corresponding color through the contact 41.

4 is an equivalent circuit diagram of a state in which a test voltage is applied to a test pad of green (G) among the anode lines.

When the light emitting diode emits light normally (lines R, G, and B in FIG. 4), and when a defect occurs between the anodes, only 1/2 of the voltage is applied to emit light slightly darker than normal emission (left R in FIG. 4). , G, B lines) are shown.

As shown in the right R, G, and B lines of FIG. 4, when there is no defect, the light emitting diodes of the red (R) and blue (B) anode lines do not emit light.

Otherwise, if the defect occurs between the green (G) anode line to which the test voltage is applied and the blue (B) anode positioned next to it, such as the left R, G, and B lines of FIG. 4, the green (G) anode Ohmic current flows from the line to the blue (B) anode line. As a result, the light emitting diode of the green (G) anode line emits dark light, and the light emitting diode of the blue (B) anode line emits dark light. At this time, the light emitting diode of the red (R) anode line does not emit light.

5A is an equivalent circuit diagram of an organic EL panel applying a test voltage to an anode line when there is no defect corresponding to part V of FIG. 4, and FIG. 5B is an anode line when there is a defect corresponding to part V of FIG. 4. An equivalent circuit diagram of an organic EL panel to which a test voltage is applied.

As shown in FIGS. 5A and 5B, a test voltage is applied to the green (G) anode line, and the blue (B) anode line and the cathode line CA3 are grounded.

In the normal case, as shown in FIG. 5A, the green (G) anode line and the blue (B) anode line are separated by the capacitor C1, and the light emitting diode component D1 emits normal light.

If a defect occurs and a resistance component R1 is present between the green (G) anode line and the blue (B) anode line, the test voltage applied to the green (G) anode line is the light emitting diode component (D1, D2). ), Thereby emitting light in the green (G) and blue (B) cells, and the emission state is darker than normal.

For the purpose of describing the present invention, an example according to a defect in the case where a bridge between anode lines is generated has been described, but the light emitting diode of the corresponding cell performs abnormal light emission even in other defect states. In addition, the closed loop and the open loop for each defect state have different voltage and current characteristics depending on the resistance component, the diode component, and the like included in the closed loop.

Therefore, the defect state and the defect type can be determined by analyzing the current and voltage characteristics of each cell using an ammeter and a voltmeter in a state where a test voltage is applied.

FIG. 6 is a diagram illustrating a layout of an organic EL panel according to another embodiment of the present invention. In the embodiment of FIG. 2, a separator 70 is further formed between patterns commonly connected to test pads for each color. Let's do it.

This is because when the gap between the red (R) test pad 44, the green (G) test pad 45, and the blue (B) test pad 46 is narrow when forming a pattern by forming a metal mask, a bridge is formed. This is to prevent it.

As described above, according to the present invention, the defects generated during the process, that is, the cathode bulkhead, the anode line pattern, and the defects of the organic light emitting diode, etc., are aged without a separate connection device and a test device before aging. -meter) is easy to check.

In addition, a preferred embodiment of the present invention is for the purpose of illustration, those skilled in the art will be able to various modifications, changes, substitutions and additions through the spirit and scope of the appended claims, such modifications and changes are the following claims It should be seen as belonging to a range.

Claims (6)

In an organic EL panel in which drive cells are formed in an active region, Each extension end of odd-numbered cathode lines formed in the cells is commonly connected, and each extension end of even-numbered cathode lines is commonly connected to form a cathode test pad, And an extension end of the anode line corresponding to at least one color of the anode lines formed in the cells is commonly connected to a test pad for each color. The method of claim 1, A contact is formed at an extended end of the anode line for each color, and a test pattern extending to the test pad is electrically connected to each of the anode lines corresponding to the same color through the contact. The method of claim 2, And a separator is further formed between the test patterns corresponding to each of the colors to insulate the organic EL panel. The method of claim 1, And the test pad is formed outside the scribing line. At least one of each of the cathode test pads to which each extending end of the odd-numbered cathode lines formed in the cells is commonly connected, and each extending end of the even-numbered cathode lines is commonly connected, and at least one of the anode lines formed in the cells By using a test pad for each color in which extension ends of the anode lines corresponding to the colors are commonly connected, voltage / current characteristics are determined by applying test voltages alternately between test pads corresponding to two different colors forming the same cell. The defect inspection method of the organic electroluminescent panel which judges a defect state. delete

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