Patent Publication Number: US-11658262-B1

Title: Method for manufacturing light emitting device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of U.S. provisional application Ser. No. 62/873,191, filed on Jul. 12, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
    
    
     BACKGROUND 
     Technical Field 
     The disclosure relates to a method for manufacturing an electronic device, and in particular, to a method for manufacturing a light emitting device. 
     Description of Related Art 
     Light emitting diode (LED) transfer is a key step in the method for manufacturing light emitting devices. Several methods have been proposed for transferring LEDs between different substrates. However, due to the limited information on LED transfer technology, knowledge of LED mass transfer, selective transfer or repair transfer is insufficient or incomplete. 
     SUMMARY 
     The disclosure provides a method for manufacturing a light emitting device, which is suitable for LED mass transfer, selective transfer, or repair transfer. 
     According to an embodiment of the disclosure, a method for manufacturing a light emitting device includes: providing a substrate with light emitting units disposed thereon; attaching the light emitting units to a carrier; removing the substrate; and transferring a portion of the light emitting units from the carrier to a driving substrate. 
     Based on the above, in one or more embodiments of the disclosure, the method for manufacturing the light emitting device describes LED transfer technology and is suitable for LED mass transfer, selective transfer, or repair transfer. 
     In order to make the above features or advantages of the disclosure more obvious, the following embodiment is described in detail with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. 
         FIG.  1 A  to  FIG.  1 D  are flowcharts of a method for manufacturing a light emitting device according to a first embodiment of the disclosure. 
         FIG.  1 E  is a schematic diagram showing an alternative step that can replace the step shown in  FIG.  1 A . 
         FIG.  2 A  to  FIG.  2 C  are flowcharts of a method for manufacturing a light emitting device according to a second embodiment of the disclosure. 
         FIG.  3 A  to  FIG.  3 B  are flowcharts of a method for manufacturing a light emitting device according to a third embodiment of the disclosure. 
         FIG.  4 A  to  FIG.  4 B  are flowcharts of a method for manufacturing a light emitting device according to a fourth embodiment of the disclosure. 
         FIG.  5 A  and  FIG.  5 B  are schematic top views of a light emitting device before and after repairing, respectively. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The disclosure may be understood by referring to the following detailed descriptions in conjunction with the accompanying drawings. It should be noted that in order for the reader to understand easily and for the simplicity of the drawings, multiple drawings in the disclosure only illustrate a portion of the light emitting device, and specific elements in the drawings are not drawn to scale. In addition, the number and size of each element in the drawings are only for illustration and are not intended to limit the scope of the disclosure. 
     Certain terms are used throughout the disclosure and the appended claims to refer to specific elements. Persons skilled in the art should understand that electronic equipment manufacturers may refer to the same elements using different names. The disclosure is not intended to distinguish between the elements with the same function but different names. In the following specification and claims, words such as “having” and “including” are open-ended words, which should be interpreted as the meaning of “including but not limited to . . . ”. 
     Directional terms such as “up”, “down”, “front”, “rear”, “left”, “right”, etc., as mentioned in the disclosure only refer to directions with reference to the drawings. Therefore, the directional terms are only for illustration and are not intended to limit the disclosure. In the drawings, the drawings illustrate general characteristics of methods, structures, and/or materials used in specific embodiments. However, the drawings should not be construed to define or limit the scope or nature covered by the embodiments. For example, for clarity, the relative size, thickness, and location of each film layer, region, and/or structure may be reduced or enlarged. 
     It should be understood that when an element or film layer is referred to as being disposed “on” or “connected” to another element or film layer, the former may be directly on or directly connected to the other element or film layer or there may be an intervening element or film layer between the two (indirect case). In contrast, when an element is referred to as being “directly on” or “directly connected” to another element or film layer, there is no intervening element or film layer between the two. 
     The term “approximately”, “around”, “equal to”, “equal”, or “same” typically represents falling within a 20% range of a given value or range, or represents falling within a 10%, 5%, 3%, 2%, 1%, or 0.5% range of a given value or range. 
     In the disclosure, the same or similar elements will be given the same or similar reference numerals, and detailed descriptions thereof will be omitted. In addition, as long as the features in different embodiments do not violate the spirit of the disclosure and are not mutually conflicting, they may be mixed and used arbitrarily. Also, all simple equivalent changes and modifications made according to the specification or claims fall within the scope of the disclosure. In addition, terms such as “first”, “second”, etc. mentioned in the specification or claims are only used to name discrete elements or to distinguish different embodiments or ranges, but not to limit the upper limit or lower limit of the number of elements and the manufacturing sequence or configurational sequence of the elements. 
     The light emitting device of the disclosure may include a display device, an antenna device, a sensing device, or a splicing device, but is not limited thereto. In one example, the light emitting device may be a backlight module of a display device, but not limited thereto. The light emitting device may be a bendable or flexible device. The light emitting device may include, for example, at least one light emitting unit. The light emitting unit may include a light emitting diode (LED). The LED may include, for example, an organic LED (OLED), a mini LED, a micro LED, or a quantum dot LED (abbreviated as QLED or QDLED), fluorescence, phosphor, other suitable materials, or a combination thereof, but is not limited thereto. 
       FIG.  1 A  to  FIG.  1 D  are flowcharts of a method for manufacturing a light emitting device according to a first embodiment of the disclosure. Referring to  FIG.  1 A , a substrate  10  with light emitting units  12  disposed thereon is provided. In some embodiments, the substrate  10  is a growth substrate, and the light emitting units  12  may be formed on the substrate  10  through an epitaxy process, but not limited thereto. The growth substrate may include a sapphire wafer or other substrate suitable for fabricating the light emitting units  12 . In other embodiments, the substrate  10  is a carrier substrate, and the light emitting units  12  may be formed on or disposed on the substrate  10  through a transfer process, but not limited thereto. The carrier substrate (also referred to as “a carrier”) may include a rigid substrate for carrying the light emitting units  12 , but not limited thereto. In some embodiments, the carrier substrate may further include an adhesive layer (not shown) to allow the light emitting units  12  to be attached to the rigid substrate. The adhesive layer may include one or more organic material layers. A material of the one or more organic material layers may include acrylic, silicone, photo resin, resin, or petroleum series material, but not limited thereto. 
     At least one of the light emitting units  12  may include a light emitting diode (LED)  120 . The at least one of the light emitting units  12  may further include a plurality of pads  122  (e.g., a pair of pads  122 ) disposed on the LED  120 , wherein the LED  120  is located between the plurality of pads  122  and the substrate  10 , and the LED  120  can be lit by receiving external signals via the plurality of pads  122 . 
     Then, the light emitting units  12  are attached to a carrier  20 . In some embodiments, the light emitting units  12  are attached to the carrier  20  through a lamination process, wherein a lamination pressure thereof is in a range from 0.1M Pa to 3M Pa (i.e., 0.1×10 6  Pa≤lamination pressure≤3×10 6  Pa), and a lamination temperature thereof is in a range from room temperature to 300° C. (i.e., room temperature≤lamination temperature≤300° C.). The room temperature may be around 25° C. 
     In some embodiments, the carrier  20  may include a rigid substrate  200  and an adhesive layer  202  disposed on the rigid substrate  200 . The rigid substrate  200  has stiffness to maintain a flat surface for carrying the light emitting units  12  during the transfer of the light emitting units  12 . For example, the rigid substrate  200  includes a glass substrate, but not limited thereto. The adhesive layer  202  is adapted to allow the light emitting units  12  to be attached to the rigid substrate  200 , and when the adhesive layer  202  is exposed to light, heat, or mechanical force, the adhesive ability or sticky force of the adhesive layer  202  may be reduced or the adhesive layer  202  may be evaporated. For example, the adhesive layer  202  may include one or more organic material layers. A material of the one or more organic material layers may include acrylic, silicone, photo resin, resin, petroleum series material, other suitable materials, and a combination thereof, but not limited thereto. The adhesive layer  202  may be a single layer or multiple layers. A thickness T 202  of the adhesive layer  202  may be in a range from 0.1 μm to 100 μm (i.e., 0.1 μm≤T 202 ≤100 μm), but not limited thereto. The thickness T 202  of the adhesive layer  202  may refer to the maximum thickness of the cross-sectional area of the adhesive layer  202 . In some alternative embodiments, the adhesive layer  202  may include a UV tape or a thermal tape, but not limited thereto. 
     The light emitting units  12  may be attached to the adhesive layer  202  after the light emitting units  12  are attached to the carrier  20 . In some embodiments, the light emitting units  12  may contact the adhesive layer  202  and may not be immersed in the adhesive layer  202 , as shown in  FIG.  1 A . However, whether the light emitting units  12  are immersed in the adhesive layer  202  or not is not limited in the disclosure, and the depths to which the light emitting units  12  are immersed in the adhesive layer  202  may depend on factors such as process conditions (e.g., lamination force) and the material property.  FIG.  1 E  is a schematic diagram showing an alternative step that can replace the step shown in  FIG.  1 A . As shown in  FIG.  1 E , in some alternative embodiments, the light emitting units  12  may be immersed in the adhesive layer  202 , and the light emitting units  12  may or may not contact the rigid substrate  200 . 
     After the light emitting units  12  are attached to the carrier  20 , the substrate  10  may be removed. The upper half of  FIG.  1 B  illustrates the situation where the substrate  10  is removed and the carrier  20  attached with the light emitting units  12  is turned over. 
     In some embodiments, the substrate  10  is removed from the light emitting units  12  through a light illumination process, an etching process, a heating process, a mechanical force application process, or a combination thereof. Take the light illumination process for example, the substrate  10  may be illuminated by an energy beam (not shown). The energy beam may be a laser beam, but not limited thereto. In some embodiments, a wavelength of the energy beam may be in a range from 200 nm to 1064 nm (i.e., 200 nm≤wavelength≤1064 nm), but not limited thereto. For example, the wavelength of the energy beam may be 266 nm, 308 nm, 355 nm, 532 nm, or 1064 nm, but not limited thereto. 
     In the case where the substrate  10  is a growth substrate (such as a sapphire substrate) and the light emitting units  12  are grown on the growth substrate, a chemical reaction generated by the irradiation of the energy beam causes nitrogen gas to be generated at an interface between the substrate  10  and the light emitting units  12 , thereby separating the substrate  10  from the light emitting units  12 . In the case where the substrate  10  is a carrier substrate and the light emitting units  12  are attached to an adhesive layer (not shown) of the carrier substrate, a chemical reaction generated by the irradiation of the energy beam causes the adhesive layer of the carrier substrate to reduce its adhesive ability or causes the adhesive layer of the carrier substrate to evaporate, thereby separating the substrate  10  from the light emitting units  12 . Under both circumstances, the energy beam illuminates the substrate  10  from a side of the substrate  10  opposite to the carrier  20  to minimize the effect of the energy beam on the adhesive layer  202  of the carrier  20 , and the light emitting units  12  are still attached to the carrier  20  after the irradiation of the energy beam. Moreover, the substrate  10  may be separated from the light emitting units  12  by illuminating the entire substrate  10  with the energy beam or by illuminating partial regions (e.g., regions of the substrate  10  that are overlapped with the light emitting units  12  in a normal direction D of the substrate  10 ) of the substrate  10  with the energy beam. 
     After the substrate  10  is removed, a portion of the light emitting units  12  (e.g., the light emitting units  12 P among the light emitting units  12 ) are transferred from the carrier  20  to a driving substrate  40 , as shown in  FIG.  1 B  to  FIG.  1 D . 
       FIG.  1 B  illustrates a step of a selective transfer. The selective transfer refers to a case where a portion of the light emitting units  12  (e.g., the light emitting units  12 P among the light emitting units  12 ) are transferred, and the other portion of the light emitting units  12  (e.g., the light emitting units  12 P′ among the light emitting units  12 ) are not transferred. 
     Referring to  FIG.  1 B , the portion of the light emitting units  12  (e.g., the light emitting units  12 P among the light emitting units  12 ) are transferred from the carrier  20  to another carrier (e.g., a carrier  30 ). In some embodiments, the portion of the light emitting units  12  (e.g., the light emitting units  12 P among the light emitting units  12 ) are transferred from the carrier  20  to the carrier  30  through steps of: turning over the carrier  20  attached with the light emitting units  12  and the light emitting units  12  faces the carrier  30 ; and illuminating regions R of the carrier  20  overlapped with the light emitting units  12 P by an energy beam EB. For the related description of the energy beam EB and the chemical reaction generated at the adhesive layer  202  of the carrier  20  due to the irradiation of the energy beam EB, please refer to the above, and it will not be repeated here. 
     After the irradiation of the energy beam EB, the adhesive ability or sticky of the adhesive layer  202  is reduced or the adhesive layer  202  is evaporated in regions R subjected to the energy beam EB, and the light emitting units  12 P falls on the carrier  30  by gravity. In some embodiments, a gap G between the carrier  20  and the carrier  30  when the carrier  20  is illuminated by the energy beam EB may be in a range from 1 μm to 300 μm (i.e., 1 μm≤G≤300 μm) to improve the accuracy or success rate of LED transfer, such as 50 μm, 100 μm or 200 μm. The gap G between the carrier  20  and the carrier  30  refers to the distance between the outermost surface of the carrier  20  facing the carrier  30  and the outermost surface of the carrier  30  facing the carrier  20  along a stacking direction of the carrier  20  and the carrier  30 . 
     In some embodiments, the carrier  30  may include a rigid substrate  300  and an adhesive layer  302  disposed on the rigid substrate  300 , but not limited thereto. For the related description of the rigid substrate  300  and the adhesive layer  302 , please refer to the rigid substrate  200  and the adhesive layer  202  above, and it will not be repeated here. In some embodiments, the rigid substrate  300  and the rigid substrate  200  may have the same or different properties, such as material, thickness, light transmittance, hardness, or the like. In some embodiments, the adhesive layer  302  and the adhesive layer  202  may have the same or different properties, such as material, thickness, viscosity, number of film layers, or the like. In some embodiments, a thickness T 302  of the adhesive layer  302  may be in a range from 0.1 μm to 100 μm (i.e., 0.1 μm≤T 302 ≤100 μm, such as 1 μm, 5 μm, 10 μm, or 50 μm), and the thickness T 302  of the adhesive layer  302  may be the same as or different from the thickness T 202  of the adhesive layer  202 . The thickness T 302  of the adhesive layer  302  refers to the maximum thickness of the cross-sectional area of the adhesive layer  302 . 
     After the portion of the light emitting units  12  (e.g., the light emitting units  12 P among the light emitting units  12 ) are transferred from the carrier  20  to the carrier  30 , the light emitting units  12 P are disposed on the adhesive layer  302 , and the LEDs  120  of the light emitting units  12 P are located between the plurality of pads  122  and the adhesive layer  302 . 
     The adhesive layer  302  may help the light emitting units  12 P attach to the rigid substrate  300  with acceptable shift or twist. Therefore, in the step of  FIG.  1 B , the selective transfer can also be changed to a mass transfer or a repair transfer as needed. 
     Referring to  FIG.  1 C , after the light emitting units  12 P are transferred to the carrier  30 , the light emitting units  12 P are transferred from the carrier  30  to the driving substrate  40 . In some embodiments, the light emitting units  12 P are transferred from the carrier  30  to the driving substrate  40  through steps of: bonding the pads  122  of the light emitting units  12 P to pads  402  of the driving substrate  40 ; and removing the carrier  30 . In some embodiments, the carrier  30  attached with the light emitting units  12 P is turned over and the pads  122  of the light emitting units  12 P faces the pads  402  of the driving substrate  40 , and the light emitting units  12 P and the pads  402  are located between the carrier  30  and the circuit board  400  of the driving substrate  40 . The circuit board  400  may be a printed circuit board (PCB), but not limited thereto. Then, the pads  122  of the light emitting units  12 P are aligned and in contacted with the pads  402  of the driving substrate  40 . After the pads  122  of the light emitting units  12 P are in contacted with the pads  402  of the driving substrate  40 , an eutectic bonding or a reflow process may be performed and the pads  122  of the light emitting units  12 P are connected to the pads  402  of the driving substrate  40 . 
     After the pads  122  of the light emitting units  12 P are connected to the pads  402  of the driving substrate  40 , the carrier  30  may be removed by illuminating the carrier  30  by an energy beam (not shown). For the related description of the energy beam and the chemical reaction generated at the adhesive layer  302  of the carrier  30  due to the irradiation of the energy beam, please refer to the above, and it will not be repeated here. 
     After the carrier  30  is removed from the light emitting units  12 P, a light emitting device  1  is manufactured, as shown in  FIG.  1 D . 
     In the embodiment shown in  FIGS.  1 A to  1 D , the light emitting units  12 P are bonded to the driving substrate  40  through the transfer processes (e.g. one mass transfer process shown in  FIG.  1 A , one selective transfer process shown in  FIG.  1 B  and one mass transfer process shown in  FIG.  1 C ). With the three transfer processes, the light emitting units  12 P to be transferred to the driving substrate  40  can be picked up from the substrate  10  and the pads  122  of the light emitting units  12 P can be turned to the direction where the pads  402  of the driving substrate  40  can be joined, which facilitates the bonding of the pads  122  of the light emitting units  12 P and the pads  402  of the driving substrate  40 . Moreover, because the accuracy or success rate of LED transfer is/are improved in the three transfer processes, the yield of the method for manufacturing the light emitting device  1  and the reliability of the light emitting device  1  can be improved. 
     In some embodiments, the light emitting units  12  (including the light emitting units  12 P and the light emitting units  12 P′) may emit light with the same color. For example, the light emitting units  12  are red light emitting units, green light emitting units, or blue light emitting units. After the light emitting units of a first color are transferred to the driving substrate  40  through the steps shown in  FIGS.  1 A to  1 D , the light emitting units of a second color or multiple colors may be transferred to the driving substrate  40  by performing the steps shown in  FIGS.  1 A to  1 D  once or multiple times. 
     According to different requirements, in addition to the steps shown in  FIGS.  1 A to  1 D , the manufacturing of the light emitting device  1  may also include other additional steps. For example, a step of attaching the circuit board  400  of the driving substrate  40  to other circuits (not shown) after the required transfer processes are completed, but not limited thereto. 
       FIG.  2 A  to  FIG.  2 C  are flowcharts of a method for manufacturing a light emitting device according to a second embodiment of the disclosure, wherein  FIG.  2 A  is a schematic top view, and  FIGS.  2 B and  2 C  are schematic cross-sectional views. 
     Referring to  FIG.  2 A , a driving substrate  40 A is provided. The driving substrate  40 A may further include a pixel defining layer  404  in addition to the circuit board  400  and the pads  402 . The pixel defining layer  404  is disposed on the circuit board  400 , and the pixel defining layer  404  includes holes H for accommodating the light emitting units to be transferred to the driving substrate  40 A. In some embodiments, as shown in  FIG.  2 A , the hole H may be disposed with a pair of pads  402  to be bonded with the pads  122  of one light emitting unit. The design parameters (e.g., the pitch/shape/size/arrangement of the holes H) of the holes H may be changed as required and therefore are not limited to those shown in  FIG.  2 A . For example, in some embodiments, the shape of the holes H may be circular, triangular, other polygon, or other suitable shape. 
     In some embodiments, a material of the pixel defining layer  404  may include an opaque insulating material to properly shield the elements located underneath from being seen by the user or reduce reflections. A material of the opaque insulating material may include acrylic, silicone, resin, or photo resin, and the material may be mixed with dyes to reduce light transmittance, but not limited thereto. In some embodiments, the pixel defining layer  404  may be formed on the circuit board  400  through a pattern process. The pattern process may include a spin coating process, a slit coating process, a printing process, or any other lithography processes. 
     Referring to  FIG.  2 B , the substrate  10  provided with the light emitting units  12  is located on the driving substrate  40 A, and the light emitting units  12  face the driving substrate  40 A. The pads  122  of the light emitting units  12  are aligned with the pads  402  of the driving substrate  40 A. Then the light emitting units  12 P are transferred to the driving substrate  40 A through a selective transfer process. For example, regions RA of the substrate  10  overlapped with the light emitting units  12 P in the normal direction D of the substrate  10  are illuminated by the energy beam EB, and the light emitting units  12 P are separated from the substrate  10  and fall on the driving substrate  40 A. For the related description of the energy beam EB and the chemical reaction generated at the substrate  10  due to the irradiation of the energy beam EB, please refer to the above, and it will not be repeated here. 
     Referring to  FIG.  2 C , after the light emitting units  12 P are transferred from the substrate  10  to the driving substrate  40 A, an eutectic bonding or a reflow process may be performed and the pads  122  of the light emitting units  12 P are connected to the pads  402  of the driving substrate  40 A. In some embodiments, a substrate (not shown) may press down the light emitting units  12 P during the eutectic bonding, but not limited thereto. 
     After the pads  122  of the light emitting units  12 P are connected to the pads  402  of the driving substrate  40 A, a light emitting device  1 A is manufactured, as shown in  FIG.  2 C . 
     In the embodiment shown in  FIGS.  2 A to  2 C , the holes H of the pixel defining layer  404  can limit the regions where the light emitting units  12 P fall and thus improves the accuracy of the LED transfer. Moreover, side walls of the holes H can support the light emitting units  12 P, and thus reduce the poor contact due to LED tilting or improve success rate of the LED transfer. Therefore, the light emitting units  12 P may be bonded to the driving substrate  40 A through the transfer processes (e.g. one selective transfer process shown in  FIG.  2 B ), and the yield of the method for manufacturing the light emitting device  1 A and the reliability of the light emitting device  1 A can be improved. 
     In some embodiments, the light emitting units with different colors may sequentially be transferred to the driving substrate  40 A by performing the steps shown in  FIGS.  2 A to  2 C  multiple times. That is, the light emitting units with the same color may be transferred at the same time, but not limited thereto. According to different requirements, in addition to the steps shown in  FIGS.  2 A to  2 C , the manufacturing of the light emitting device  1 A may also include other additional steps. For example, a step of attaching the circuit board  400  of the driving substrate  40 A to other circuits (not shown) after the required transfer processes are completed, but not limited thereto. 
       FIG.  3 A  to  FIG.  3 B  are flowcharts of a method for manufacturing a light emitting device according to a third embodiment of the disclosure. Referring to  FIG.  3 A , the substrate  10  provided with the light emitting units  12  is located on the carrier  20 , and the light emitting units  12  face the carrier  20 . Then the light emitting units  12 P are transferred to the carrier  20  through a selective transfer process. For example, regions RA of the substrate  10  overlapped with the light emitting units  12 P in the normal direction D of the substrate  10  are illuminated by the energy beam EB, and the light emitting units  12 P are separated from the substrate  10  and fall on the carrier  20 . A gap GB between the substrate  10  and the carrier  20  when the substrate  10  is illuminated by the energy beam EB may be greater than 0 μm and less than or equal to 1000 μm (i.e., 0 μm&lt;GB≤1000 μm, such as 100 μm, 200 μm, 400 μm, or 800 μm) to improve the accuracy or success rate of LED transfer. The gap GB between the substrate  10  and the carrier  20  refers to the distance between the outermost surface of the carrier  20  facing the substrate  10  and the outermost surface of the substrate  10  facing the carrier  20  along a stacking direction of the carrier  20  and the substrate  10 . For the related description of the energy beam EB and the chemical reaction generated at the substrate  10  due to the irradiation of the energy beam EB, please refer to the above, and it will not be repeated here. 
     Referring to  FIG.  3 B , after the selective transfer shown in  FIG.  3 A , the light emitting units  12 P are transferred from the carrier  20  to the carrier  30 . For example, the light emitting units  12 P are attached to the carrier  30 , and then the carrier  20  is removed. When the light emitting units  12 P are attached to the carrier  30 , the light emitting units  12 P may contact the adhesive layer  302  of the carrier  30 . 
     After the light emitting units  12 P are attached to the carrier  30 , the carrier  20  is removed. The adhesion of the adhesive layer  302  to the light emitting units  12 P shall be greater than the adhesion of the adhesive layer  202  to the light emitting units  12 P, and when the carrier  20  is removed, the light emitting units  12 P are still attached to the carrier  30 . Accordingly, the adhesive layer  302  of the carrier  30  has a adhesive ability or sticky higher than that of the adhesive layer  202  of the carrier  20 . 
     After the light emitting units  12 P are transferred from the carrier  20  to the carrier  30 , steps shown in  FIGS.  1 C and  1 D  may be sequentially proceeded, and the light emitting device  1  in  FIG.  1 D  is manufactured. 
     In the embodiment shown in  FIGS.  3 A and  3 B , the light emitting units  12 P are bonded to the driving substrate  40  through the transfer processes (e.g. one selective transfer process shown in  FIG.  3 A  and two mass transfer process shown in  FIG.  3 B  and  FIG.  1 C ). 
     In some embodiments, the light emitting units with different colors may sequentially be transferred to the driving substrate  40  by performing the steps shown in  FIGS.  3 A,  3 B,  1 C and  1 D  multiple times. According to different requirements, in addition to the steps shown in  FIGS.  3 A,  3 B,  1 C and  1 D , the manufacturing of the light emitting device  1  may also include other additional steps. For example, a step of attaching the circuit board  400  of the driving substrate  40  to other circuits (not shown) after the required transfer processes are completed, but not limited thereto. 
       FIG.  4 A  to  FIG.  4 B  are flowcharts of a method for manufacturing a light emitting device according to a fourth embodiment of the disclosure. Referring to  FIG.  4 A , after the light emitting units  12  are transferred from the substrate  10  to the carrier  20  as shown in  FIG.  1 A , the light emitting units  12  are transferred from the carrier  20  to the carrier  30 . For example, the light emitting units  12  are attached to the carrier  30 , and then the carrier  20  is removed. When the light emitting units  12  are attached to the carrier  30 , the light emitting units  12  are attached to the adhesive layer  302  of the carrier  30 . 
     Referring to  FIG.  4 B , after the light emitting units  12  are transferred from the carrier  20  to the carrier  30 , the light emitting units  12 P may be transferred from the carrier  30  to the driving substrate  40 A by illuminating regions RB of the carrier  30  overlapped with the light emitting units  12 P by the energy beam EB. For the related description of the energy beam EB and the chemical reaction generated at the adhesive layer  302  of the carrier  30  due to the irradiation of the energy beam EB, please refer to the above, and it will not be repeated here. 
     After the light emitting units  12  are transferred from the carrier  20  to the carrier  30 , the step shown in  FIG.  2 C  may be proceeded, and the light emitting device  1 A in  FIG.  2 C  is manufactured. 
     In some embodiments, the light emitting units with different colors may sequentially be transferred to the driving substrate  40 A by performing the steps shown in  FIGS.  1 A,  4 A,  4 B and  2 C  multiple times. According to different requirements, in addition to the steps shown in  FIGS.  1 A,  4 A,  4 B and  2 C , the manufacturing of the light emitting device  1 A may also include other additional steps. For example, a step of attaching the circuit board  400  of the driving substrate  40 A to other circuits (not shown) after the required transfer processes are completed, but not limited thereto. 
       FIG.  5 A  and  FIG.  5 B  are schematic top views of a light emitting device before and after repairing, respectively.  FIG.  5 A  illustrates a driving substrate  40 B of a light emitting device  1 B before repairing. The light emitting device  1 B includes red light emitting units R, green light emitting units G and blue light emitting units B disposed on the driving substrate  40 B and arranged in an array. For repair needs, the driving substrate  40 B further includes redundant regions RR disposed adjacent to the red light emitting units R, the green light emitting units G and the blue light emitting units B. When at least one of the light emitting units on the driving substrate  40 B is found to be inoperable, a light emitting unit having the same color as that of the inoperable light emitting unit (the light emitting unit with x mark) may be disposed in the redundant region RR adjacent to the inoperable light emitting unit through a repair transfer process. For example, red light emitting units R may be transferred to redundant regions RR adjacent to the inoperable red light emitting units R through one of the transfer processes described above. Then, green light emitting units G may be transferred to redundant regions RR adjacent to the inoperable green light emitting units G through one of the transfer processes described above. Then, blue light emitting units B may be transferred to redundant regions RR adjacent to the inoperable blue light emitting units B through one of the transfer processes described above. 
     In summary, in one or more embodiments of the disclosure, the method for manufacturing the light emitting device describes light emitting unit transfer technology and is suitable for the mass transfer, the selective transfer, or the repair transfer. In some embodiments, the light emitting units may be detached from a substrate or a carrier through a light illumination process (e.g., a laser lift off process). In some embodiments, the selective transfer may be performed by illuminating the regions of the substrate or the carrier that are overlapped with the light emitting units to be detached from the substrate or the carrier by the energy beam of the light illumination process. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents. Moreover, each of the claims constitutes an individual embodiment, and the scope of the disclosure also includes the scope of the various claims and combinations of the embodiments.