KR20190080204A - Organic light emitting diode display apparatus and method of repairing the same - Google Patents

Abstract

The present invention provides an organic light emitting display apparatus having a division structure inside of the single pixel and improving an inner structure so that a part where a bright defect occurs is cut off and the other part may be normally operated when a bright defect of a pixel occurs, and a repair method thereof. According to an embodiment of the present invention, the organic light emitting display apparatus comprises: a light emitting diode; a pixel circuit driving the light emitting diode; and an anode connecting the light emitting diode and pixel circuit. The light emitting diode is divided into a first light emitting diode and second light emitting diode. The anode is divided into a first anode and second anode respectively connected to the first light emitting diode and second light emitting diode.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) display,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display and a repair method thereof, and more particularly, to an organic light emitting display and a repair method thereof, in which a pixel can be divided and used when a defective dot of a pixel occurs.

2. Description of the Related Art Generally, a display module is a device for displaying visual information and is utilized in various fields such as a mobile phone, a television receiver, a personal digital assistant (PDA), a digital camera, a computer monitor and the like.

Such a display module has been enlarged in accordance with the development of information technology, and a curved surface display module in which curvature is formed on the surface of the display module has been developed and used.

In addition, the display module is divided into various types according to a light emitting mode and the like. The display module may be a liquid crystal display device (LCD), a plasma display panel device (PDP), an organic light emitting display emitting diode display device). Particularly, the organic light emitting display device has advantages of being capable of thinning due to its self-emitting property, and is a next generation display module which is highly illuminated due to its high contrast ratio.

The OLED display includes a plurality of pixels, and a plurality of TFT circuits for driving each pixel and a plurality of lines for inputting and outputting signals to the plurality of TFT circuits are connected, do.

In such an organic light emitting display device, defects may occur in which each pixel is not normally driven due to a characteristic deterioration of each TFT and a short circuit between the lines and the layers during the process of manufacturing the organic light emitting diode and the pixel circuit, May result in arm ignition or defective spotting.

When a dark ignition failure occurs in a pixel, when the size and location of the pixel are small, it is determined and processed according to the quality management principle.

Also, if defective defects occur in the pixels, the defective process is performed in which the defective pixel is disconnected from the portion to which the anode electrode of the pixel circuit is connected to darken the defective pixel.

However, in the related art, even when a defect causes only a part of a pixel, the problem of quality defect due to the ignition of the entire pixel is increasing, and an improvement of the structure for minimizing the ignition of the ignition by activating a certain area of the pixel, Development is required.

Korean Patent Laid-Open No. 10-2017-0081015

In order to solve the above-mentioned problems, the present invention provides a pixel structure in which a divided structure is provided inside a single pixel, and the internal structure is improved so that the remaining portion of the pixel can be normally operated Emitting display device and a repair method thereof.

According to an aspect of the present invention, there is provided an OLED display including: a light emitting diode; A pixel circuit for driving the light emitting diode; And an anode electrode connecting the light emitting diode and the pixel circuit, wherein the light emitting diode is divided into a first light emitting diode and a second light emitting diode, and the anode electrode is divided into a first light emitting diode and a second light emitting And a first anode electrode and a second anode electrode respectively connected to the diode.

The anode electrode may further include a connection electrode connected to the pixel circuit at one end and connected to the first anode electrode and the second anode electrode at the other end, And the second anode electrode is branched at the other end of the connection electrode.

The OLED display further includes a substrate for forming a pixel circuit; A transistor formed on the substrate and including a source / drain electrode connected to the pixel circuit; An insulating layer positioned between the transistor and the anode electrode; A bank layer positioned between the anode electrode and the light emitting diode and defining a light emitting region; A cathode electrode disposed on the light emitting diode; And a transparent electrode layer applied on the cathode electrode layer, wherein the anode electrode can be connected to the pixel circuit through the transistor.

The cathode electrode may include a first cathode electrode and a second cathode electrode disposed on the first light emitting diode and the second light emitting diode, respectively.

The first light emitting diode or the second light emitting diode connected to any one of the first anode electrode or the second anode electrode may be ignited.

According to another aspect of the present invention, there is provided a repair method for an organic light emitting display, including: a light emitting diode; A pixel circuit for driving the light emitting diode; And an anode electrode connecting the light emitting diode and the pixel circuit, wherein the light emitting diode is divided into a first light emitting diode and a second light emitting diode, and the anode electrode is connected to the first light emitting diode and the second light emitting diode A method of repairing an organic light emitting display device, comprising: a first anode electrode and a second anode electrode, the first anode electrode and the second anode electrode being connected to each other, the repairing method comprising: a detection step of detecting occurrence of defective spotting of the first light emitting diode or the second light emitting diode; And a step of irradiating a laser to cut off one of the first anode electrode or the second anode electrode adjacent to the first light emitting diode or the second light emitting diode in which a defective spot occurs, And a dividing step of igniting the first light emitting diode or the second light emitting diode which has failed and activating the first light emitting diode or the second light emitting diode connected to the other one.

The method may further include a confirmation step of shorting the first light emitting diode or the second light emitting diode that has been ignited in the dividing step to check whether the ignition is performed.

In addition, the laser used in the dividing step may include an Nd-YAG laser.

Here, the Nd-YAG laser can emit a laser having a wavelength of 1.064 mu m.

According to the present invention, when a light emitting diode is divided and provided so that a defective spot of a light emitting diode occurs, only one of them can be ignited and the other region can be activated, thereby minimizing the defective rate and reducing the grade of the product Can be minimized and the overall production yield can be improved.

1 is a view for explaining an organic light emitting display according to an embodiment of the present invention.
2 is a circuit diagram illustrating a pixel structure of an organic light emitting diode display according to an exemplary embodiment of the present invention.
3 is an enlarged plan view of a portion of a pixel of an OLED display according to an exemplary embodiment of the present invention.
4 is a sectional view taken along the line IV-IV in Fig. 3;
5 is a circuit diagram for explaining a state of generating AC-SHORT in a pixel structure of an organic light emitting diode display according to an embodiment of the present invention.
6 is a plan view of a part of a pixel of an OLED display in accordance with an embodiment of the present invention.
7 is a cross-sectional view taken along line VII-VII of FIG. 6;

Certain terms are hereby defined for convenience in order to facilitate a better understanding of the present invention. Unless otherwise defined herein, scientific and technical terms used in the present invention shall have the meanings commonly understood by one of ordinary skill in the art. Also, unless the context clearly indicates otherwise, the singular form of the term also includes plural forms thereof, and plural forms of the term should be understood as including its singular form.

1 is a view for explaining an organic light emitting display according to an embodiment of the present invention.

1, the OLED display 1000 according to the present embodiment includes a plurality of data lines DL to DLm and a plurality of gate lines GL1 to GLn, A data driver 1200 for driving the plurality of data lines DL to DLm, a gate driver 1300 for driving the plurality of gate lines GL1 to GLn, A timing controller 1400 for controlling the gate driver 1200 and the gate driver 1300, and the like.

The data driver 1200 drives the plurality of data lines DL to DLm by supplying data voltages to the plurality of data lines DL to DLm.

The gate driver 1300 sequentially supplies a scan signal of an on voltage or an off voltage to the plurality of gate lines GL1 to GLn under the control of the timing controller 1400, And sequentially drives the gate lines GL1 to GLn.

The timing controller 1400 controls the data driver 1200 and the gate driver 1300 by supplying control signals to the data driver 1200 and the gate driver 1300.

The timing controller 1400 starts scanning according to the timing implemented in each frame, switches the input image data input from the outside according to the data signal format used by the data driver 1200, and outputs the converted image data , And controls the data driving at a suitable time according to the scan.

In this embodiment, the gate driver 1300 may be located only on one side of the organic light emitting display panel 1100 as shown in FIG. 1, or on both sides of the organic light emitting display panel 1100, depending on the driving method, You may.

On the other hand, each unit pixel further includes driving voltage lines and reference voltage lines arranged in parallel with the data lines DL to DLm. A plurality of transistors disposed in each unit subpixel may include a source / drain electrode SD branched from a data line, a driving voltage line, or a reference voltage line.

Meanwhile, the unit pixel of the present embodiments may include one or more sub pixels. For example, the unit pixel of the present embodiments may include 2 to 4 subpixels. (R), green (G), blue (B), and optionally white (W) as the colors defined by subpixels, but the present embodiments are not limited thereto. However, one unit pixel of the organic light emitting diode display 1000 according to embodiments to be described later will be described with reference to a configuration including at least one white (W) subpixel.

The color arrangement of the organic light emitting display panel 1100 may be configured such that red (R), white (W), green (G), and blue (B) are repeatedly arranged. The organic light emitting display panel 1100 having such a color arrangement structure may exhibit a dark spot or a defective spot due to a defect such as a foreign object or a wiring short in a sub-pixel.

On the other hand, in the present embodiment, the unit pixel and the subpixel are all units for emitting light, and can be used as a pixel in this embodiment.

Each of these pixels may be provided with a light emitting diode, and may include a pixel circuit for driving the light emitting diode.

On the other hand, in the process of manufacturing the organic light emitting display device, a defect that the normal driving of the light emitting diode is not performed due to the degradation of characteristics of the transistor or the occurrence of internal short-circuit may occur.

On the other hand, when defective pixels are generated in the panel of the organic light emitting display device, the defective points are ignited through the laser repair process.

2 is a circuit diagram illustrating a pixel structure of an OLED display according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 2, an organic light emitting diode (OLED) display device is provided with a plurality of unit pixels 100 including a light emitting diode 110 and a pixel circuit 130, 110 will be described in detail as follows.

In this embodiment, the pixel circuit 130 can be supplied with the data voltage at the data line DL to the first switching TFT ST1. Further, a scan signal may be supplied from the gate line GL to the first switching TFT ST1. The first switching TFT (ST1) can supply and supply the data voltage in accordance with the scan signal.

On the other hand, the data voltage supplied and switched in the first switching TFT ST1 is supplied to the driving TFT DT connected to the power supply for port (EVDD) to control the data driving current.

The driving TFT DT is supplied with a data driving current from the driving lines EVDD and PL arranged horizontally with the data lines and is driven by the data lines SW1 to SW4 according to the data voltages supplied and switched in the first switching TFTs ST1 The supplied data driving current can be controlled and supplied to the light emitting diode 110.

On the other hand, the data driving current switched in the driving TFT DT can be compensated for by the second switching TFT ST2.

The second switching TFT ST2 is supplied with a reference voltage from a reference power supply line Vref and RL arranged in parallel with the data line DL and the driving line PL and is formed in the same direction as the gate line GL The current supplied to the light emitting diode 110 can be compensated by controlling the operation of the driving TFT DT by switching the reference voltage according to a sense signal supplied from the sense signal line SL.

The organic light emitting display device of the present embodiment controls the light emission of the light emitting diode 110 by transmitting the data driving current supplied by the pixel circuit 130 to the light emitting diode 110 through the anode electrode 105 can do.

In this embodiment, the anode electrode 105 includes a connection electrode 105a connected to the pixel circuit 130 through a source / drain electrode, a first electrode 105b connected to the connection electrode 105a and the first light emitting diode 112, And a second anode electrode 105c branched to connect the first anode electrode 105b and the connection electrode 105a to the second light emitting diode 114. [

FIG. 3 is a plan view of a part of a pixel of an organic light emitting diode display according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.

Referring to FIGS. 3 and 4, the OLED display of the present embodiment may be provided in a structure in which the light emitting diode 110 is divided into a first light emitting diode 112 and a second light emitting diode 114.

The anode electrode 105 connected to each pixel circuit 130 is connected to the first anode electrode 105b and the second anode electrode 105c so as to be connected to the first light emitting diode 112 and the second light emitting diode 114. [ .

Specifically, the organic light emitting display of the present embodiment may include a substrate 101 provided for forming a pixel circuit. The substrate 101 may be formed of a glass material, and an insulating film may be further formed thereon.

A driving TFT DT and a source / drain electrode SD connected to the pixel circuit 130 may be formed on the substrate 101.

A PAS layer 102 and an overcoat layer 103, i.e., a first overcoat layer 103a and a second overcoat layer 103b, which are insulating layers, may be formed on the source / drain electrodes SD.

Meanwhile, an anode electrode 105 may be formed on the insulating layer. One end of the anode electrode 105 may be electrically connected to the source / drain electrode SD. For this purpose, a first contact hole 104a may be formed in the source / drain electrode SD through a first overcoat layer 103a and connected to the via hole or the ILDH (Inter Layer Dielectric Hole) structure . Here, the first contact hole 104a may be formed before the formation of the second overcoat layer 103b. A second contact hole 104b may be formed in the anode electrode 105 to pass through the second overcoat layer 103b and to be connected to the via hole or ILDH (Inter Layer Dielectric Hole) structure.

One end of the anode electrode 105 is electrically connected to the source / drain electrode SD via the first contact hole 104a and the second contact hole 104b so that the data driving current from the driving TFT DT And may further include an input connection electrode 105a.

The organic light emitting diode display of the present embodiment includes a light emitting diode 110 divided into a first light emitting diode 112 and a second light emitting diode 114. The first light emitting diode 112 and the second light emitting diode The first anode electrode 105b and the second anode electrode 105c, which are branched from the connection electrode 105a, may be connected to the second electrode 114, respectively.

For example, the anode electrode 105 may be connected to the source / drain electrode SD and may be connected to the point P2 through the point P1 and may be connected to the connection electrode 105a. The portion connected to the first light emitting diode 112 and the second light emitting diode 114 may be the first anode electrode 105b and the second anode electrode 105c.

In addition, a bank layer 106 for setting a light emitting region may be disposed as an insulating layer on the anode electrode AN and the second overcoat layer 103b.

The light emitting diode 112 includes a first light emitting diode 112 connected to the first anode electrode 105b and a second light emitting diode 114 connected to the second anode electrode 105c at an upper portion of the bank layer 106 110 may be located.

In addition, a cathode electrode 107 is stacked and electrically connected to the upper portion of the light emitting diode 110. The cathode electrode 107 may include a first cathode electrode and a second cathode electrode, respectively, the first light emitting diode 112 and the second light emitting diode 114.

Further, a transparent electrode layer 108, which is a protective layer, may be further stacked on the cathode electrode 107 and the bank layer 106.

FIG. 5 is a circuit diagram for explaining a state of generating AC-SHORT in a pixel structure of an organic light emitting diode display according to an embodiment of the present invention. FIG. And is a plan view in which a defective spot defect is repaired in part. 7 is a cross-sectional view taken along line VII-VII in FIG.

5 to 7, the OLED display of the present embodiment includes a light emitting diode 110 divided into a first light emitting diode 112 and a second light emitting diode 114, and an anode electrode 105 may be branched to the first anode electrode 105b and the second anode electrode 105c and connected to the first light emitting diode 112 and the second light emitting diode 114. [

In this OLED display device, when any one of the light emitting diodes 110 of the pixels 100 is defective, the first light emitting diode 112 or the second light emitting diode 114 connected to the second light emitting diode 114, The first light emitting diode 112 or the second light emitting diode 105c connected to the other one of the first anode electrode 105b or the second anode electrode 105c or the second light emitting diode 112b connected to the other one of the first anode electrode 105b and the second anode electrode 105c, It is possible to activate only the second light emitting diode 114.

That is, conventionally, when the defective spot of the light emitting diode 110 occurs, the light emitting diode 110 is totally ignited by the repair process. However, in this embodiment, when defective spot defect occurs in the light emitting diode 110, The first anode electrode 105b or the second anode electrode 105c connected to one of the first light emitting diode 112 or the second light emitting diode 114 is disconnected to cut off the power supply, 1 light emitting diode 112 or second light emitting diode 114 can be activated.

As described above, in the organic light emitting diode display of the present embodiment, it is possible to prevent a pixel from being judged to be defective by activating a region where no defective spot is generated in the entire region of the light emitting diode 105.

For example, the anode electrode 105 is connected by the connection electrode 105a from the point where the source / drain electrode SD is connected to the point P2, and the first light emitting diode 112 and the second light emitting diode The first anode electrode 105b or the second anode electrode 105c may be branched between the first and second anode electrodes 114 and 114. [

When only the first light emitting diode 112 among the light emitting diodes 110 is defective, the connection electrode 105a between the source / drain electrodes SD and P2 is connected, and the first It is possible to ignite the first light emitting diode 112 in a state where the anode electrode 105b is laser-repaired and disconnected.

The second anode electrode 105c is electrically connected to the connection electrode 105a and the second light emitting diode 114 is electrically connected to the connection electrode 105a and the second anode electrode 105c, So that the light emission can be normally performed.

A repair method of the organic light emitting display device constructed as described above will be described as follows.

The organic light emitting display of the present embodiment may be provided with a plurality of unit pixels 100 including a light emitting diode 110 and a pixel circuit 130 for driving the light emitting diode 110.

In such an organic light emitting diode display, when a defective spot of the light emitting diode 110 occurs, only a part of the light emitting diode 110 in which defective spot defects are generated through the repair process can be ignited and the remaining part can be activated.

To this end, the organic light emitting display of the present embodiment may be provided with the light emitting diode 110 divided into the first light emitting diode 112 and the second light emitting diode 114.

The first light emitting diode 112 and the second light emitting diode 114 are connected to the source / drain electrodes 112a and 113b by the connection electrode 105a, the first anode electrode 105b and the second anode electrode 105c, respectively, The operation can be controlled by the data driving current supplied from the driving TFT DT in connection with the drain electrode SD.

On the other hand, when either one of the first light emitting diode 112 and the second light emitting diode 114 malfunctions, one of the first light emitting diode 112 or the second light emitting diode 114, And the other one of the first light emitting diode 112 or the second light emitting diode 114 can be repaired to activate.

To this end, a detecting step may be firstly performed to detect occurrence of defective spot on the light emitting diodes 110, that is, the first light emitting diode 112 and the second light emitting diode 114.

The detecting step can detect a defect by a method of visually inspecting the pixel 100 as a whole. At this time, the detecting step may detect the defective spot defect in any one of the light emitting diodes 110 of the pixels 100, that is, the first light emitting diode 112 and the second light emitting diode 114.

On the other hand, in the detection step, when any one of the light emitting diodes 110 of the pixels 100, that is, the first light emitting diode 112 and the second light emitting diode 114 is detected as a defective defective spot, One of the first anode electrode 105b and the second anode electrode 105c adjacent to the second light emitting diode 114 and the second light emitting diode 114 may be disconnected to block the electrical connection.

Such a repair process can be carried out using a laser welder. The operator can operate the laser welding machine to perform the division step of irradiating the laser to one portion of the first anode electrode 105b or the second anode electrode 105c adjacent to the defective spot and disconnecting the laser.

For example, when a defective spot occurs in the first light emitting diode 112, the first anode electrode 105b may be disconnected using a laser welding machine. At this time, the first light emitting diode 112 may be turned into a dark ignition state that is not lit when the electrical connection is broken. The second light emitting diode 114 may be in an activated state connected to the source / drain electrode SD by the second anode electrode 105c and the connecting electrode 105a connected thereto, The operation can be normally controlled by the data driving current.

As described above, in the OLED display device according to the present embodiment, when a defective spot defect occurs in any one of the first and second light emitting diodes 112 and 114, The first light emitting diode 112 or the second light emitting diode 114 is disconnected by disconnecting the first anode electrode 105b or the second anode electrode 105c connected to the first light emitting diode 112 or the second light emitting diode 114, Through the repair process of igniting the arm and activating the other, it is possible to prevent the light emitting diode 110 from being completely ignited, and at least half can be activated.

Meanwhile, in this embodiment, the laser used to break the first anode electrode 105b or the second anode electrode 105c in the dividing step may include an Nd-YAG laser.

Here, the Nd-YAG laser is a solid laser using neodymium as a medium and can emit laser having a wavelength of 1.064 μm. The Nd-YAG laser can also emit a laser having a wavelength of 532 μm according to specifications such as the thickness, thickness, and area of the first anode electrode 105b or the second anode electrode 105c. The internal structure and the medium of the Nd-YAG laser are not limited by the present embodiment, and the wavelength, beam size and energy (heat input amount) of the Nd-YAG laser and the like can be changed according to specifications of the product to be used.

The method of repairing an organic light emitting display in which a part of the light emitting diode 110 is reflowed to ignite a part of the light emitting diode 110 and the rest to activate the light emitting diode 110 as described above is performed by using one of the light emitting diodes 110, After the electrode 105b is disconnected, it may further include a confirmation step of confirming whether or not the cancer is purified.

The confirming step may cause a short to the first light emitting diode 112 or the second light emitting diode 114 that has been ignited by the break of the first anode electrode 105b or the second anode electrode 105c in the dividing step Thereby confirming whether or not the arm is ignited.

For example, if the first anode electrode 105b is disconnected in the dividing step and the first light emitting diode 112 is ignited, it may be checked whether a normal ignition process has been performed.

In the checking step, a disconnected portion of the first anode electrode 105b and an output terminal of the first light emitting diode 112 may be connected by a bridge (BG) to cause an AC-short. As the first anode electrode 105b is separated from the driving TFT DT, the first light emitting diode 112 in which the short-circuit is induced does not receive the data driving current and remains in the ignited state.

As described above, in the organic light emitting diode display repairing method, when a defective spot occurs in one of the divided regions of the light emitting diode 110 in which the defective spot defect occurs, i.e., the first light emitting diode 112 and the second light emitting diode 114 , The first anode electrode 105b or the second anode electrode 105c connected thereto is disconnected to darken the area where the bright spots are generated, and the divided remaining region can be normally operated to activate a part of the pixel 100 .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

100: pixel 103: overcoat layer
105: anode electrode 105a: connecting electrode
105b: first anode electrode 105c: second anode electrode
107: cathode electrode 110: light emitting diode
112: first light emitting diode 114: second light emitting diode
130: pixel circuit ST1: first switching TFT
ST2: second switching TFT PL: driving line
DT: Driving TFT 1000: Organic light emitting display
1100: organic light emitting display panel 1200: data driver
1300: Gate driver 1400: Timing controller

Claims (9)

Light emitting diodes;
A pixel circuit for driving the light emitting diode; And
And an anode electrode connecting the light emitting diode and the pixel circuit,
The light emitting diode is divided into a first light emitting diode and a second light emitting diode,
Wherein the anode electrode is divided into a first anode electrode and a second anode electrode connected to the first light emitting diode and the second light emitting diode, respectively.
The organic electroluminescence device according to claim 1, wherein the anode electrode
And a connection electrode connected at one end to the pixel circuit and at the other end to the first anode electrode and the second anode electrode,
Wherein the first anode electrode and the second anode electrode are branched at the other end of the connection electrode.
The method according to claim 1,
A substrate for forming a pixel circuit;
A transistor formed on the substrate and including a source / drain electrode connected to the pixel circuit;
An insulating layer positioned between the transistor and the anode electrode;
A bank layer positioned between the anode electrode and the light emitting diode and defining a light emitting region;
A cathode electrode disposed on the light emitting diode; And
And a transparent electrode layer coated on the cathode electrode layer,
Wherein the anode electrode is connected to the pixel circuit through the transistor,
The organic electroluminescent device according to claim 3, wherein the cathode electrode
And a first cathode electrode and a second cathode electrode disposed on the first light emitting diode and the second light emitting diode, respectively.
5. The method according to any one of claims 1 to 4,
Wherein the first light emitting diode or the second light emitting diode connected to any one of the first anode electrode and the second anode electrode is ignited.
Light emitting diodes; A pixel circuit for driving the light emitting diode; And an anode electrode connecting the light emitting diode and the pixel circuit, wherein the light emitting diode is divided into a first light emitting diode and a second light emitting diode, and the anode electrode is connected to the first light emitting diode and the second light emitting diode A method of repairing an organic light emitting diode display device, the method comprising: dividing a first anode electrode and a second anode electrode,
A detection step of detecting occurrence of defective spot of the first light emitting diode or the second light emitting diode; And
And when the defective spot defect is detected in the detecting step, the laser is irradiated to disconnect one of the first anode electrode or the second anode electrode connected to the first light emitting diode or the second light emitting diode, A step of dividing the first light emitting diode or the second light emitting diode in which the first light emitting diode or the second light emitting diode has occurred and activating the first light emitting diode or the second light emitting diode connected to the other one;
Wherein the organic light emitting display comprises a light emitting diode.
The method according to claim 6,
Further comprising a confirming step of confirming whether the first light emitting diode or the second light emitting diode is lighted by ignition in the dividing step.
The method according to claim 6,
Wherein the laser used in the dividing step includes an Nd-YAG laser.
9. The method of claim 8,
Wherein the Nd-YAG laser emits a laser having a wavelength of 1.064 mu m.

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