KR20060018765A - Light emitting display - Google Patents

Abstract

The present invention relates to a light emitting display device having an identification mark.

The light emitting display device according to the present invention includes a plurality of power lines formed on a substrate, a plurality of data lines and a plurality of scan lines, and configured to emit light by receiving a current corresponding to a data signal supplied to the data line from the power line. And a display unit having pixels, and at least one ID mark formed to overlap the power line.

With this arrangement, the present invention can improve productivity by forming a visually identifiable ID mark simultaneously with the polysilicon layer or gate metal layer of the transistor without additional processing. In addition, the present invention by forming the ID mark so as to overlap with the power line or the data driver it is possible to form a large ID mark without spatial limitations.

Description

Light emitting display device {LIGHT EMITTING DISPLAY}             

1 illustrates a general light emitting display device.

2 is a diagram illustrating a light emitting display device according to a first embodiment of the present invention.

3A is a view of the ID mark shown in FIG. 2 viewed from the front direction of the substrate.

FIG. 3B is a view of the ID mark shown in FIG. 2 viewed from the back direction of the substrate.

FIG. 4 is a diagram illustrating the types of two-dimensional barcodes among the encryption codes illustrated in FIGS. 3A and 3B.

FIG. 5 is a diagram illustrating each pixel illustrated in FIG. 2.

FIG. 6 is a cross-sectional view taken along the line II ′ of FIG. 2 and a cross section taken along the line II-II ′ of FIG. 5.

FIG. 7 is a cross-sectional view of another form illustrating a cross section taken along line II ′ of FIG. 2 and a cross section taken along line II-II ′ of FIG. 5.

8 is a diagram illustrating a light emitting display device according to a second embodiment of the present invention.

9 is a diagram illustrating a light emitting display device according to a third embodiment of the present invention.

10 is a diagram illustrating a light emitting display device according to a fourth embodiment of the present invention.

11 is a diagram illustrating a light emitting display device according to a fifth embodiment of the present invention.

12 is a diagram illustrating a light emitting display device according to a sixth embodiment of the present invention.

13 is a diagram illustrating a light emitting display device according to a seventh embodiment of the present invention.

14 is a diagram illustrating a light emitting display device according to an eighth embodiment of the present invention.

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

10, 110: substrate 21, 121: pixel

20, 120: display unit 30, 130: scan driver

40, 140: data driver 50, 150: first power supply line

52, 152: second power line 60, 160: pad portion

125: pixel circuit 154: auxiliary power line

170: ID mark 172: text code

174: encryption code

The present invention relates to a light emitting display device, and more particularly, to a light emitting display device having an identification mark.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, a light emitting display, and the like.

Among the flat panel displays, a light emitting display device is a self-light emitting device that emits a fluorescent material by recombination of electrons and holes, and includes an inorganic light emitting display device including an inorganic light emitting layer and an organic light emitting layer according to materials and structures. It is roughly divided into. Such a light emitting display device has an advantage of having a fast response speed, such as a cathode ray tube, compared to a passive light emitting device requiring a separate light source like a liquid crystal display device.

1 illustrates a general light emitting display device.

Referring to FIG. 1, a general light emitting display device is disposed in a region defined by a substrate 10, scan lines S, data lines D, and pixel power lines VDD formed on the substrate 10. A display unit 20 having a plurality of pixels 21, a scan driver 30, a data driver 40, a first power line 50, a second power line 52, and a pad unit 60 are provided.

The scan driver 30 is disposed to be adjacent to one side of the display unit 20 and electrically connected to the first pads Ps of the pad unit 60 through the scan control signal line 32. The scan driver 30 generates a scan signal according to the scan control signal line 32 and sequentially supplies the scan signal to the scan lines S of the display unit 20.

The data driver 40 is electrically connected to the data line D, and is electrically connected to the second pad Pd of the pad part 60. In this case, the data driver 40 may be manufactured in a chip form and mounted on the substrate 10.

The second power line 52 is formed on the front surface of the display unit 20. The second power line 52 commonly supplies the second pixel driving voltage transmitted from the fifth pad Pvss of the pad unit 60 to each pixel 121.

The first power supply line 50 is formed adjacent to the upper side of the display unit 20 and commonly connected to one side of the pixel power supply line VDD. The first power line 50 receives the first pixel driving voltage transmitted from the fourth pad Pvdd of the pad unit 60 through the first power supply line 48 to the pixel power line of each pixel 21. VDD).

One side of each pixel power supply line VDD is commonly connected to the first power supply line 50. Each pixel power supply line VDD supplies the first pixel driving voltage supplied from the first power supply line 50 to each pixel 21.

Accordingly, each pixel 21 is controlled by a scan signal supplied to the scan line S and emits light by a current supplied from the pixel power line VDD to the light emitting element according to the data signal supplied to the data line D. To display an image.

Such a general light emitting display device displays an ID mark by hand on the back surface of the substrate 10 in order to display the history of the light emitting display device during the manufacturing process. By visually checking the ID mark marked by hand, the operator can check the production history of the light emitting display device. However, a general light emitting display device requires a separate process of displaying an ID mark by hand and a separate process of erasing an ID mark displayed by hand.

Accordingly, an object of the present invention is to provide a light emitting display device having an identification mark.

Another object of the present invention is to provide a light emitting display device capable of forming an ID mark without spatial limitations.

As a technical means for achieving the above object, the first aspect of the present invention is a power line formed on a substrate, a plurality of data lines and a plurality of scanning lines defined by the current corresponding to the data signal supplied to the data line Provided is a light emitting display device including a display unit having a plurality of pixels which are supplied from a power line to emit light, and at least one ID mark formed to overlap the power line.

Preferably, each pixel includes a pixel circuit for outputting the current using at least two transistors having a semiconductor layer and a gate metal layer, and at least one capacitor, and a light emitting device for emitting light by the current output from the pixel circuit. do. In addition, the ID mark is formed by at least one of the semiconductor layer and the gate metal layer, and the ID mark is formed of a text code including numbers and letters and at least one code of one-dimensional and two-dimensional codes.

A second aspect of the present invention is defined by a power supply line formed on a substrate, a plurality of data lines and a plurality of scanning lines, and corresponds to a data signal from the power supply line by a pixel circuit including a transistor having a semiconductor layer and a metal layer. A light emitting display device comprising: a display unit having a plurality of pixels which emit light by receiving a current; a data driver for supplying a data signal to the data line; and a first ID mark formed of the semiconductor layer to overlap the data driver. To provide.

Preferably, the light emitting display further includes at least one second ID mark formed to overlap the power line. In this case, the second ID mark is formed by at least one of the semiconductor layer and the metal layer, and the first and second ID marks are at least one of a text code and a one-dimensional and two-dimensional code including numbers and letters. Is formed by the code of.

Hereinafter, with reference to the accompanying drawings 2 to 14 the most preferred embodiment that can be easily implemented by those of ordinary skill in the art as follows.

2 is a diagram illustrating a light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 2, the light emitting display device according to the first embodiment of the present invention is positioned on the substrate 110 and defined by data lines D, scan lines S, and a plurality of pixel power lines VDD. The display unit 120 including the plurality of pixels 121, the first power line 150, and the ID mark 170 are provided.

In addition, the light emitting display device according to the first embodiment of the present invention further includes a scan driver 130, a data driver 140, a second power line 152, an auxiliary power line 154, and a pad unit 160. can do.

The scan driver 130 is disposed to be adjacent to one side of the display unit 120 and electrically connected to the first pad Ps of the pad unit 160. The scan driver 130 generates a scan signal according to the scan control signal lines from the first pads Ps and sequentially supplies the scan signals to the scan lines S of the display unit 120.

The data driver 140 is electrically connected to the data line D, and is electrically connected to the second pads Pd of the pad unit 160. In this case, the data driver 140 may be directly formed on the substrate 110 or manufactured in a chip shape and mounted on the substrate 110. Here, the chip-shaped data driver 140 may be mounted on the substrate 110 by a chip on glass method, a wire bonding method, a flip chip method, a beam lead method, or the like. The data driver 140 receives the data control signal and the data signal from the second pads Pd and supplies the data signal to the data lines D according to the data control signal.

The first power line 150 is formed along the edge of the substrate 110 except for the pad unit 160 to be adjacent to both side surfaces and the upper side of the display unit 120. Both ends of the first power supply line 150 are electrically connected to the third pad Pvdd1 of the pad unit 160. The first power line 150 supplies a first pixel driving voltage supplied from a voltage generator not shown through the third pad Pvdd1 to one side of the pixel power line VDD of each pixel 121. .

The auxiliary power line 154 is formed to be adjacent to the lower side of the display unit 120. Both ends of the auxiliary power line 154 are electrically connected to the fourth pad Pvdd2 of the pad unit 160. The auxiliary power line 154 supplies the first pixel driving voltage supplied from the voltage generator through the fourth pad Pvdd2 to the other side of the pixel power line VDD of each pixel 121.

The second power line 152 is formed on the front surface of the display unit 120. The second power line 152 supplies the second pixel driving voltage transmitted from the fifth pad Pvss of the pad unit 160 to each pixel 121 in common.

The ID mark 170 is formed to overlap the first power line 150. The ID mark 170 has specific information such as a process state of the substrate 110 and product information.

3A is a view of the ID mark 170 shown in FIG. 2 viewed from the front direction of the substrate, and FIG. 3B is a view of the ID mark 170 shown in FIG. 2 viewed from the rear direction of the substrate.

3A and 3B and FIG. 2, the ID mark 170 is formed to overlap one power line 150 adjacent to an upper side of the display unit 120. This ID mark 170 is formed of a text code 172 and / or an encryption code 174.

The text code 172 is formed by a combination of letters and / or numbers to have specific information such as process status and product information of the substrate 110.

The encryption code 174 is formed according to a method such as a one-dimensional barcode and a two-dimensional barcode to have information such as process status and product information of a specific substrate 110. Here, the one-dimensional bar code expresses letters, numbers, and symbols by combining a bar (black bar) and a space (white bar) in a specific form, and is formed by arranging data in the horizontal axis (X direction). .

4 is a diagram illustrating a two-dimensional bar code among the encryption codes shown in FIGS. 3A and 3B.

The two-dimensional barcode is flattened by arranging the data in both axes (X direction and Y direction) as shown in FIG. 4, and the QR code, PDF417, Data Matrix, Maxi Code, Veri approved by the World Standard Organization (ISO) Code, Codablock, Aztec Code, Code 16K, Code One, Calula Code, BP04 State Code and Postnet Code.

As shown in FIG. 3A, the ID mark 170 is formed to have a reverse phase in the front direction of the substrate 110 on which the display unit 120 is formed. In addition, as shown in FIG. 3B, the ID mark 170 has a normal shape in the back direction of the substrate 110 on which the display unit 120 is formed.

As such, the ID mark 170 formed of the text code 172 may be read by the naked eye in the back direction of the substrate 110. In this case, in the case of the ID mark 170 formed of the text code 172, the ID mark 170 may be identified in the front direction of the substrate 110 by the intaglio pattern shown on the first power line 150. In addition, the ID mark 170 formed of the encryption code 174 may be read using a code reader.

FIG. 5 is a diagram illustrating each pixel 121 illustrated in FIG. 2.

Referring to FIG. 5 and FIG. 2, each pixel 121 includes an organic light emitting diode OLED and a pixel circuit 125. Each pixel 121 is selected by a scan signal applied to the scan line S, and generates light corresponding to the data signal supplied to the data line D. FIG.

The anode electrode of the organic light emitting element OLED is connected to the pixel circuit 125, and the cathode electrode is connected to the second power supply line 152. The organic light emitting diode OLED includes a light emitting layer, an electron transporting layer, and a hole transporting layer formed between the anode electrode and the cathode electrode. In addition, the organic light emitting diode OLED may further include an electron injection layer and a hole injection layer. In the organic light emitting diode OLED, when a voltage is applied between the anode electrode and the cathode electrode, electrons generated from the cathode electrode move to the light emitting layer through the electron injection layer and the electron transport layer, and holes generated from the anode electrode are transferred to the hole injection layer. And move toward the light emitting layer through the hole transport layer. Accordingly, in the light emitting layer, light is generated when the electrons and holes supplied from the electron transport layer and the hole transport layer collide and recombine.

The pixel circuit 125 includes first and second transistors M1 and M2 and a capacitor Cst.

The gate electrode of the first transistor M1 is connected to the scan line S, the source electrode is connected to the data line D, and the drain electrode is connected to the first node N1. The first transistor M1 supplies the data signal from the data line D to the first node N1 in response to the scan signal supplied to the scan line S. FIG.

The gate electrode of the second transistor M2 is connected to the first node N1 in which the drain electrode and the capacitor Cst of the first transistor M1 are commonly connected, and the source electrode is connected to the pixel power line VDD. In addition, the drain electrode is connected to the anode electrode of the OLED. The second transistor M2 emits the organic light emitting diode OLED by controlling a current supplied from the pixel power line VDD to the organic light emitting diode OLED according to the voltage supplied to its gate electrode.

The capacitor Cst stores a voltage corresponding to the data signal supplied to the first node N1 via the first transistor M1 in a section in which the selection signal is supplied to the scan line S, and then the first transistor. When M1 is off, the on state of the second transistor M2 is maintained for one frame.

6 is a cross-sectional view of the first power line shown in FIG. 2 taken along the line II ′ and a cross-sectional view of the second transistor M2 illustrated in FIG. 5 taken along line II-II ′. to be.

Referring to FIG. 6 and FIGS. 2 and 5, cross-sectional views of the ID mark 170 and the second transistor M2 of each pixel 121 in the light emitting display device according to the exemplary embodiment will be described below.

The second transistor M2 of each pixel 121 includes a buffer layer 210, a semiconductor layer 221, a gate insulating layer 230, a gate electrode 241, an interlayer insulating layer 250, and a source electrode on the substrate 110. 261, the drain electrode 263, the data line D, the first power line 150, the lower electrode layer 280, the protective layer 270, the pixel defining layer 285, the organic light emitting element 290, and An upper electrode layer 295.

The buffer layer 210 is formed on the entire surface of the substrate 110.

The semiconductor layer 221 is formed to have a predetermined pattern on the buffer layer 210 corresponding to the transistor region on the substrate 110. The semiconductor layer 221 is formed of polycrystalline silicon or the like obtained by heat-treating amorphous silicon. In this case, the amorphous silicon is crystallized by a laser crystallization process of scanning a beam using an excimer laser to become polycrystalline silicon.

Meanwhile, the semiconductor layer 221 has a source region 221s and a drain region 221d by an ion doping process, and has a channel 221c between the source region 221s and the drain region 221d. do.

The gate insulating layer 230 is formed to cover the substrate 110, the buffer layer 210, and the semiconductor layer 221. The gate insulating layer 230 may be formed of an insulating material, for example, SiO ₂ or SiNx.

The gate electrode 241 is formed on the gate insulating film 230 so as to overlap the semiconductor layer 221. The gate electrode 241 may be a conductor, for example, Al, MoW, Mo / Al / Mo, Al / Cu, Ti / Al / Ti, or the like. At the same time as the gate electrode 241, the scan line S has the same material as the gate electrode 241.

The interlayer insulating layer 250 is formed to cover the substrate 110 and the gate electrode 241.

The source electrode 261 and the drain electrode 263 are formed of a metal material to have a predetermined pattern on the interlayer insulating film 250. The source electrode 261 and the drain electrode 263 are formed in the semiconductor layer 221 through contact holes 265 and 267 formed in the interlayer insulating layer 250 and the gate insulating layer 230 so that the semiconductor layer 221 is exposed. It is electrically connected to each of the source region 221s and the drain region 221d.

The data line D and the first power line 150 are formed simultaneously with the source electrode 261 and the drain electrode 263. In this case, the first power line 150 overlaps the ID mark 170 formed on the buffer layer 210.

The protective layer 270 is formed to cover the substrate 110, the source electrode 261, the drain electrode 263, the data line D, and the first power line 150.

The lower electrode layer 280 is electrically connected to the drain electrode 221d through the contact hole 272 formed in the protective layer 270 so that the drain electrode 261 is exposed. The lower electrode layer 280 is used as an anode of the organic light emitting diode OLED.

The pixel defining layer 285 is formed on the lower electrode layer 280 and the protection layer 270 to have an opening for partitioning the region of each pixel 121.

The organic light emitting element 290 is formed in the opening defined by the pixel defining layer 285.

The upper electrode layer 295 is formed on the entire surface of the substrate 110 to cover the organic light emitting diode 290 and the pixel defining layer 285. The upper electrode layer 295 is used as a cathode of the organic light emitting diode OLED, and is electrically connected to the second power line 152.

Meanwhile, the ID mark 170 is formed on the buffer layer 210 corresponding to the ID mark region on the substrate 110 simultaneously with the semiconductor layer 221 of the transistor. The ID mark 170 includes the text code and the encryption code described above by the semiconductor layer 221 of the transistor.

FIG. 7 is a cross-sectional view of a cross section taken along line II ′ of the first power line shown in FIG. 2 and a cross section taken along line II-II ′ of the second transistor shown in FIG. 5. .

2 and 5, the cross section of the ID mark 170 and the second transistor M2 of each pixel 121 in the light emitting display device according to the exemplary embodiment of the present invention are referred to as ID mark 170. Except for the cross section shown in FIG. Accordingly, the ID mark 170 is formed on the gate insulating layer 230 as a gate metal layer. In this case, the ID mark 170 is formed simultaneously with the gate electrode 241 of the second transistor M2.

As described above, in the light emitting display device according to the first exemplary embodiment, the ID mark 170 is formed to overlap the first power line 150 using the semiconductor layer or the gate metal layer of the transistor. Preferably, the ID mark 170 is formed of a semiconductor layer of the transistor. This is because the semiconductor layer of the transistor is initially formed in the light emitting display device, so that the ID mark 170 is formed as the semiconductor layer so that the history of the product can be managed from the beginning of the manufacturing process of the light emitting display device.

Therefore, the light emitting display device according to the first embodiment of the present invention is not limited to the space for forming the ID mark 170. As a result, the present invention can be formed to be distinguishable without spatial limitations without compressing the entire information of the ID mark 170.

8 is a diagram illustrating a light emitting display device according to a second embodiment of the present invention.

Referring to FIG. 8, the light emitting display device according to the second embodiment of the present invention is the same as the light emitting display device of the first embodiment of the present invention except for the position of the ID mark 170. Accordingly, in the second embodiment of the present invention, descriptions of other components except for the ID mark 170 will be replaced with the description of the first embodiment of the present invention.

The ID mark 170 of the light emitting display according to the second embodiment of the present invention is formed to overlap the first power line 150 parallel to the data line D. FIG. The ID mark 170 is formed of a semiconductor layer or a gate metal layer of the transistor as shown in FIGS. 6 and 7.

9 is a diagram illustrating a light emitting display device according to a third embodiment of the present invention.

Referring to FIG. 9, the light emitting display device according to the third embodiment of the present invention is the same as the light emitting display device of the first embodiment of the present invention except for the ID mark 170. Accordingly, in the fourth embodiment of the present invention, descriptions of other components except for the ID mark 170 will be replaced with the description of the first embodiment of the present invention.

The ID mark 170 of the light emitting display according to the fourth exemplary embodiment of the present invention is formed to overlap the first power line 150 parallel to the scan line S of the display unit 120, and at the same time, the data line of the display unit 120. It is formed to overlap with the first power line 150 parallel to (D). In this case, the ID mark 170 is formed of a semiconductor layer or a gate metal layer of the transistor as shown in FIGS. 6 and 7.

10 is a diagram illustrating a light emitting display device according to a fourth embodiment of the present invention.

Referring to FIG. 10, the light emitting display device according to the fourth embodiment of the present invention is the same as the light emitting display device of the first embodiment of the present invention except for the ID mark 170. Accordingly, in the third embodiment of the present invention, descriptions of other components except for the ID mark 170 will be replaced with the description of the first embodiment of the present invention.

The ID mark 170 of the light emitting display device according to the fourth embodiment of the present invention is formed to overlap the data driver 140 mounted on the substrate 110. The ID mark 170 is formed of any one of a semiconductor layer, a gate metal layer, and a source / drain metal layer of the transistor, as shown in FIGS. 6 and 7.

11 is a diagram illustrating a light emitting display device according to a fifth embodiment of the present invention.

Referring to FIG. 11, the light emitting display device according to the fifth embodiment of the present invention is the same as the light emitting display device of the first embodiment of the present invention except for the first and second ID marks 170a and 170b. do. Accordingly, in the fifth embodiment of the present invention, descriptions of other components except for the first and second ID marks 170a and 170b will be replaced with the description of the first embodiment of the present invention.

The first ID mark 170a is formed to overlap the data driver 140 mounted on the substrate 110. The second ID mark 170b is formed to overlap the first power line 150 parallel to the scan line S of the display unit 120. In this case, the first ID mark 170a is formed of any one of a semiconductor layer, a gate metal layer, and a source / drain metal layer of the transistor. In addition, the second ID mark 170b is formed of a semiconductor layer or a gate metal layer of the transistor as shown in FIGS. 6 and 7.

12 is a diagram illustrating a light emitting display device according to a sixth embodiment of the present invention.

Referring to FIG. 12, the light emitting display device according to the sixth embodiment of the present invention is the same as the light emitting display device of the fifth embodiment of the present invention except for the position of the second ID mark 170b. Accordingly, in the sixth embodiment of the present invention, descriptions of other components except for the second ID mark 170b will be replaced with the description of the first and fifth embodiments of the present invention.

The second ID mark 170b of the light emitting display device according to the sixth embodiment of the present invention is formed to overlap the first power line 150 parallel to the data line D of the display unit 120.

13 is a diagram illustrating a light emitting display device according to a seventh embodiment of the present invention.

Referring to FIG. 13, the light emitting display device according to the seventh embodiment of the present invention is the same as the light emitting display device of the fifth embodiment of the present invention except for the second ID mark 170b. Accordingly, in the seventh embodiment of the present invention, descriptions of other components except for the second ID mark 170b will be replaced with the description of the first and fifth embodiments of the present invention.

The second ID mark 170b of the light emitting display device according to the seventh embodiment of the present invention is formed to overlap the first power line 150 parallel to the scan line S of the display unit 120 and to display the display unit 120. The first power line 150 parallel to the data line D is formed to overlap. That is, at least one second ID mark 170b is formed to overlap the first power line 150.

On the other hand, the ID mark 170 according to an embodiment of the present invention may be formed of a polysilicon layer or a gate metal layer of the transistor so as to overlap the auxiliary power line 154.

14 is a diagram illustrating a light emitting display device according to an eighth embodiment of the present invention.

Referring to FIG. 14, the light emitting display device according to the eighth embodiment of the present invention includes the first and second embodiments of the present invention except for the data driver 140 for supplying a data signal to the data line of the display unit 120. It is the same as the light emitting display device according to the second embodiment.

The data driver 140 of the light emitting display device according to the eighth embodiment of the present invention can be mounted on a flexible printed circuit 180 connected to the substrate 110. Accordingly, the data driver 140 is electrically connected to the data line D of the display unit 120 through the pad unit of the substrate 110 to supply a data signal. In this case, the data driver 140 may include a chip on board mounted on a printed circuit board, a chip on film directly mounted on a film, in addition to the flexible printed circuit 180. Alternatively, the present invention may be mounted on a conventional film type connecting element employed in a tape carrier package.

The above detailed description and drawings are merely exemplary of the present invention, which are used only for the purpose of illustrating the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Accordingly, those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical protection scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

As described above, the light emitting display device according to the embodiment of the present invention can improve productivity by forming an ID mark that can be visually identified simultaneously with the polysilicon layer or the gate metal layer of the transistor without any additional process. In addition, the present invention can form an ID mark large without spatial limitation by forming an ID mark to overlap the first power line or the data driver.

Claims (12)

A power line formed on the substrate, A display unit having a plurality of pixels defined by a plurality of data lines and a plurality of scanning lines and configured to emit light by receiving a current corresponding to a data signal supplied to the data line from the power supply line; And at least one ID mark formed to overlap the power line. The method of claim 1, Each pixel, A pixel circuit for outputting the current using at least two transistors having a semiconductor layer and a gate metal layer and at least one capacitor; And a light emitting element emitting light by current output from the pixel circuit. The method of claim 2, And the ID mark is formed by at least one of the semiconductor layer and the gate metal layer. The method of claim 1, And the ID mark is formed of a text code including numbers and letters and at least one code among one-dimensional and two-dimensional codes. The method of claim 1, And a data driver for supplying a data signal to the data line. The method of claim 1, And a scan driver for supplying a scan signal to the scan line. A power line formed on the substrate, A display unit having a plurality of pixels defined by a plurality of data lines and a plurality of scan lines, and emitting light by receiving a current corresponding to the data signal from the power supply line by a pixel circuit including a transistor having a semiconductor layer and a metal layer; A data driver for supplying a data signal to the data line; And a first ID mark formed of the semiconductor layer to overlap the data driver. The method of claim 7, wherein And at least one second ID mark formed to overlap the power line. The method of claim 8, The second ID mark is formed by at least one of the semiconductor layer and the metal layer. The method of claim 8, And the first and second ID marks are formed of a text code including numbers and letters and at least one code among one-dimensional and two-dimensional codes. The method of claim 7, wherein Each pixel, The pixel circuit outputting the current using at least two transistors having at least one semiconductor layer and a gate metal layer, and at least one capacitor; And a light emitting element emitting light by current output from the pixel circuit. The method of claim 7, wherein And a scan driver for supplying a scan signal to the scan line.

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