KR20070115068A - Organic light emitting display device - Google Patents

Abstract

An organic luminescence display device is provided to reduce the number of pads of an FPC(Flexible Printed Circuit) by contacting commonly one pad of the FPC to at least two or more pads, which are formed in zigzag. An organic luminescence display device includes a substrate, first and second lines, plural organic luminescence elements, first and second drivers, and plural pads(128R,128G,128B). The first and second lines are formed on the substrate. The organic luminescence elements are connected to the first and second lines. The first and second drivers are connected to the first and second lines, respectively. The pads are used for inputting signals to the first and second drivers. At least adjacent two pads among the plural pads are disposed to be contacted to one pad formed on a substrate.

Description

Organic light emitting display device

1 is a plan view illustrating a conventional organic light emitting display device.

2 is a circuit diagram for explaining a conventional pixel inspection circuit.

3 is a detailed view of the portion A shown in FIG. 1.

4 is a plan view illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view for describing the organic light emitting display device illustrated in FIG. 4. FIG.

6 is a circuit diagram for explaining a pixel inspection circuit of the present invention.

FIG. 7 is a detail view of portion B shown in FIG. 4; FIG.

8 is a plan view illustrating an inspection process of an organic light emitting display device according to the present invention;

<Explanation of symbols for the main parts of the drawings>

10, 100: substrate 14, 114: pixel region

16, 116: non-pixel region 20, 120: organic electroluminescent device

22, 122: scan line 24, 124: data line

26, 27, 28, 126, 127, 128: pad

30, 130: scan driver 40, 140: data driver

101: buffer layer 102: semiconductor layer

103: gate insulating film 104: gate electrode

105: interlayer insulating film 106a and 106b: source and drain

107: planarization film 108: anode electrode

109: pixel defining layer 110: organic thin film layer

111: cathode electrode 1000: mother substrate

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device capable of reducing the area of a pad portion.

Organic luminescence display devices are the next generation display devices with self-luminous characteristics.They are in terms of viewing angle, contrast, response speed, power consumption, etc., compared to liquid crystal display devices (LCDs). It has excellent characteristics at, and can be manufactured in light weight and thinness because it does not need backlight.

1 is a plan view illustrating a conventional organic light emitting display device. A scan line 22, a data line 24, and a scan line are formed in a pixel area 14 of a substrate 10. An organic light emitting display device 20 is connected between the line 22 and the data line 24 in a matrix manner to form a pixel, and the scan line 22 of the pixel area 14 is formed in the non-pixel area 16. And a power supply voltage supply line (not shown) for the operation of the scan line 22 and the data line 24 extending from the data line 24, the organic light emitting diode 20, and pads 26 to 28. The scan driver 30 and the data driver 40 are formed to process the signals provided from and supply them to the scan line 22 and the data line 24.

The organic electroluminescent device 20 is composed of an anode electrode and a cathode electrode, and an organic thin film layer formed between the anode electrode and the cathode electrode, and when a predetermined voltage is applied to the anode electrode and the cathode electrode, the anode electrode is used. Holes injected through the electrons and electrons injected through the cathode electrodes are recombined in the organic thin film layer, and light is emitted by the energy difference generated in the process.

A film-type flexible printed circuit (FPC) (not shown) is electrically connected to the pads 26 to 28 of the organic light emitting display device configured as described above, and signals (power voltage, scan signal, and data signal) are externally connected through the FPC. Etc.) is input.

When signals are input to the power supply voltage supply line, the scan driver 30, and the data driver 40 through the pads 26 to 28, the scan driver 30 and the data driver 40 scan the scan signals and the data signals, respectively. And to the data line 24. Therefore, the organic light emitting display device 20 of the pixel selected by the scan signal emits light corresponding to the data signal.

The organic light emitting display device configured as described above is manufactured as a unit display panel and then inspects defective pixels and reliability through a lighting test and an aging test. To this end, an inspection circuit including transistors QR, QG, and QB is formed in the non-pixel region 16 of the substrate 10 such as the scan driver 30 or the lower portion of the data driver 40. do. FIG. 2 is a schematic circuit diagram of a circuit for inspecting one pixel composed of organic electroluminescent elements 20 corresponding to R (red), G (green), and B (blue) colors.

3 is a detailed view of a portion A shown in FIG. 1, schematically showing a pad portion connected to the inspection circuit of FIG. 2.

The pads 28R, 28G, and 28B are connected to respective data lines 24 connected to the organic light emitting diodes 20 corresponding to the R, G, and B colors through the transistors QR, QG, and QB shown in FIG. The pad 28T is commonly connected to the gates of the transistors QR, QG, and QB. Therefore, the lighting state of the pixel composed of the organic electroluminescent elements 20 corresponding to the R, G, and B colors is supplied by supplying a signal while the pads of the FPC are electrically contacted with the pads 28R, 28G, 28B, and 28T. And reliability.

Conventionally, pads of an FPC are manually brought into contact with pads 28R, 28G, 28B, and 28T of a unit display panel. Therefore, in order to prevent contact failure due to misalignment, a pitch P2 between the test pads 28 is formed to be wider than a gap P1 between the other pads 26 and 27. Therefore, four inspection pads 28R, 28G, 28B, and 28T are required for one pixel, and the width and spacing of each inspection pad 28R, 28G, 28B, and 28T are different from those of the other pads 26 and 27. The pad portion occupies a large area because it must be formed wide. This problem is the same for the FPC pad part, and as the size of the display panel decreases, it becomes more difficult to secure the area of the pad part.

An object of the present invention is to provide an organic light emitting display device capable of reducing the area of the pad portion.

An organic light emitting display device according to an aspect of the present invention for achieving the above object is a substrate, a plurality of organic field connected to the first line and the second line formed on the substrate, the first line and the second line A light emitting device, a first driver connected to the first line, a second driver connected to the second line, and a plurality of pads for inputting signals to the first and second drivers, wherein the pads are adjacent to each other. At least two or more pads are arranged to contact one pad formed on the substrate provided from the outside.

In the organic light emitting display device having passed the lighting test and the aging test, a constant voltage is applied to the test pad during operation so that the transistor of the test circuit maintains a turn off state. Accordingly, the present invention forms pads to which the same voltage is applied adjacent to each other, and minimizes the spacing and width between the pads so that one pad formed in the FPC can be in common contact with the pad to which the same voltage is applied. To this end, the present invention allows the lighting test and the aging test to be performed in a mother glass state before being separated into the unit display panel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. no.

4 is a plan view illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.

In the pixel region 114 of the substrate 100, the organic light emitting diode constituting the pixel is connected between the scan line 122 and the data line 124 and the scan line 122 and the data line 124 in a matrix manner. 120 is formed, and in the non-pixel region 116, the scan line 122 and the data line 124 extending from the scan line 122 and the data line 124 of the pixel region 114, the organic light emitting device The scan driver 130 processing a signal provided from the outside through the power supply voltage supply line (not shown) and the pads 126 to 128 for the operation of the 120 and supplying the signal to the scan line 122 and the data line 124. And a data driver 140 is formed.

The organic light emitting diode 120 is composed of an anode electrode and a cathode electrode, and an organic thin film layer formed between the anode electrode and the cathode electrode, and when a predetermined voltage is applied to the anode electrode and the cathode electrode, holes and cathodes injected through the anode electrode Electrons injected through the electrode recombine in the organic thin film layer, and emit light due to the energy difference generated in the process. The organic thin film layer may have a structure in which a hole transport layer, an organic light emitting layer, and an electron transport layer are stacked, or may further include a hole injection layer and an electron injection layer.

In the case of the passive matrix method, the organic light emitting diode 120 is connected between the scan line 122 and the data line 124 in a matrix manner, and in the case of the active matrix method, the scan line 122 is performed. And a thin film transistor (TFT) for controlling an operation of the organic light emitting diode 120 and a signal for maintaining the signal between the organic light emitting diode 120 and the data line 124. Capacitors are further included.

In addition, the scan driver 130 and the data driver 140 may be formed on the substrate 100 of the non-pixel region 116 during the manufacturing of the organic light emitting diode 120, or may be a separate integrated circuit semiconductor chip. After the manufacturing process, the substrate 100 may be attached to the substrate 100 so as to be connected to the scan line 122 and the data line 124 by a chip on glass or a wire bonding method.

FIG. 5 is a cross-sectional view for describing the organic light emitting diode 120 in detail, and schematically illustrates an example configured in an active matrix method.

 A buffer layer 101 is formed on the substrate 100, and a semiconductor layer 102 providing an active layer is formed on the buffer layer 101. The semiconductor layer 102 provides source and drain regions and channel regions of the thin film transistor. The gate insulating film 103 is formed on the entire upper surface including the semiconductor layer 102, and the gate electrode 104 is formed on the gate insulating film 103 on the semiconductor layer 102. An interlayer insulating layer 105 is formed on the entire upper surface including the gate electrode 104, and contact holes are formed in the interlayer insulating layer 105 and the gate insulating layer 103 so that a predetermined portion of the semiconductor layer 102 is exposed. The source and drain electrodes 106a and 106b are formed on the interlayer insulating layer 105 to be connected to the semiconductor layer 102 through contact holes, and the planarization layer is formed on the entire upper surface including the source and drain electrodes 106a and 106b. 107 is formed. Via holes are formed in the planarization layer 107 to expose the source or drain electrodes 106a or 106b, and anode electrodes 108 connected to the source or drain electrodes 106a or 106b through the via holes are formed on the planarization layer 107. Is formed. In addition, a pixel defining layer 109 for exposing the anode electrode 108 of the emission region is formed on the planarization layer 107, and the organic thin film layer 110 and the cathode electrode 111 are disposed on the exposed anode electrode 108. ) Is formed.

FIG. 6 is a circuit diagram of an inspection circuit for inspecting one pixel composed of organic electroluminescent elements 120 corresponding to R (red), G (green), and B (blue) colors, which is not shown in FIG. Although not included, an inspection circuit including a plurality of transistors QR, QG, and QB is formed in the non-pixel region 116 of the substrate 100 such as the scan driver 130 or the lower portion of the data driver 140.

FIG. 7 is a detailed view of the portion B shown in FIG. 4 and schematically shows a pad portion connected to the inspection circuit of FIG. 6.

The pads 128R, 128G, and 128B are connected to respective data lines 124 connected to the organic light emitting diodes 120 corresponding to the R, G, and B colors through the transistors QR, QG, and QB shown in FIG. The pad 128T is commonly connected to the gates of the transistors QR, QG, and QB. At this time, the pads 128R, 128G, and 128B have a constant spacing and a width, and are arranged in a curved shape such as, for example, "c", "d", and zigzag in parallel to each other.

In FIG. 7, only some of the pads 128R, 128G, and 128B connected to the test circuit are illustrated, but among the pads 126 and 127 connected to the power supply voltage supply line, the scan driver 130, and the data driver 140. At least two or more adjacent pads may be arranged in a curved shape with constant spacing and width and parallel to each other, such as pads 128R, 128G, and 128B.

In this case, the widths of the pads arranged in a curved shape and the spacing between the pads are preferably smaller than the widths of the other pads 126 and 127 and the spacing between the pads, and are formed on a substrate provided from the outside, such as an FPC. One pad is formed to be in common contact. That is, since a plurality of pads having a fine width and spacing are arranged in a curved shape, alignment is easy when contacting one pad of the FPC, and contact failure does not occur. In addition, since the pads may be formed to be smaller than the widths and spacings of the other pads, the area of the pads may be reduced, so that the spacing P12 between the test pads is wider than the spacing P11 between the other pads. Alignment and contact can be facilitated. For example, the space | interval P11 and the space | interval P12 can be set to about 200 micrometers and 400 micrometers, respectively.

An FPC (not shown) in the form of a film is electrically connected to the pads 126 to 128 of the organic light emitting display device configured as described above, and a signal (power supply voltage, scan signal, data signal, etc.) is input from the outside through the FPC. do. When signals are input to the power supply voltage supply line, the scan driver 130, and the data driver 140 through the pads 126 and 127, the scan driver 130 and the data driver 140 scan the scan signal and the data signal, respectively. And to data line 124. Therefore, the organic light emitting diode 120 of the pixel selected by the scan signal emits light corresponding to the data signal. At this time, the same voltage is applied to the test pads 128R, 128G, and 128B, and a constant voltage is applied to the pads 128T so that the transistors QR, QG, and QB of the test circuit are turned off. .

On the other hand, the organic light emitting display device configured as described above may perform the lighting test and the aging test in the state of the mother substrate before being separated into the unit display panel.

8 is a plan view illustrating an inspection process of an organic light emitting display device according to an exemplary embodiment of the present invention.

A plurality of unit display panels 200 configured as shown in FIG. 4 are formed on the mother substrate 1000. In the mother substrate 1000 between the plurality of unit display panels 200 arranged in a line, wirings 128RL connected to pads 128R, 128G, 128B, and 128T connected to the inspection circuits of the unit display panels 200, respectively. , 128GL, 128BL, and 128TL are formed, and pads 128RP, 128GP, 128BP, and 128TP connected to the wirings 128RL, 128GL, 128BL, and 128TL are formed on one side of the mother substrate 1000.

Therefore, when each test signal is supplied to the pads 128RP, 128GP, 128BP, and 128TP, the signals are transmitted to the test pads 128R, 128G, 128B, and 128T through the wirings (128RL, 128GL, 128BL, and 128TL). As a result, the lighting and aging tests of the pixels including the organic light emitting diodes 120 corresponding to the R, G, and B colors may be performed. In this case, different voltages may be applied to the test pads 128R, 128G, 128B, and 128T.

As described above, the preferred embodiment of the present invention has been disclosed through the detailed description and the drawings. The terms are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the present invention allows at least two adjacent pads to be arranged in a curved form parallel to each other. Since different inspection voltages are selectively applied and lighting inspection and aging inspection can be performed in the state of the mother substrate, it is easy to set an inspection pattern arbitrarily and inspection can be performed in large quantities. In addition, in normal operation, one pad of the FPC may be commonly contacted with two or more pads arranged in a curved shape, thereby minimizing the pad area and reducing the number of pads of the FPC.

Claims (9)

Board, First and second lines formed on the substrate, A plurality of organic electroluminescent elements connected to the first line and the second line, A first driver connected to the first line, A second driver connected to the second line, A plurality of pads for inputting signals to the first and second drivers; And at least two adjacent pads of the plurality of pads are in contact with one pad formed on a substrate provided from the outside. The organic light emitting display device of claim 1, wherein a width of at least two adjacent pads is smaller than a width of another pad. The organic light emitting display device of claim 1, wherein a spacing between at least two adjacent pads is smaller than a spacing between other pads. The organic light emitting display device of claim 1, wherein the at least two adjacent pads are arranged in a form of “c”, “d”, and zigzag. The organic light emitting display device of claim 1, wherein a same voltage is applied to at least two adjacent pads. The organic light emitting display device of claim 1, further comprising an inspection circuit formed on the substrate and connected to at least one of the first line and the second line. The organic light emitting display device according to claim 6, wherein the inspection circuit comprises a plurality of transistors. The organic light emitting display device of claim 6, wherein at least two adjacent pads are connected to the inspection circuit. The organic light emitting display device of claim 6, wherein different voltages are applied to the at least two adjacent pads.

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