Patent Publication Number: US-2021184077-A1

Title: Light-emitting device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of China Patent Application No. 201911273163.6, filed on Dec. 12, 2019, the entirety of which is incorporated by reference herein. 
     BACKGROUND OF THE DISCLOSURE 
     Field of the Disclosure 
     The present disclosure relates to a light-emitting device. 
     Description of the Related Art 
     Electronic products have become indispensable necessities in modern society. With the vigorous development of such electronic products, consumers have high expectations on the quality, function and price of these products. 
     Some electronic products have light-emitting or display functions, but light-emitting devices have not yet met requirements in all respects. 
     BRIEF SUMMARY OF DISCLOSURE 
     A light-emitting device is provided in some embodiments of the present disclosure. The light-emitting device includes a flexible substrate, a light-emitting unit, a thin film transistor, and a circuit. The flexible substrate has a via. The light-emitting unit is disposed on a top surface of the flexible substrate. The thin film transistor is electrically connected to the light-emitting unit. The circuit is disposed on the bottom surface of the flexible substrate and transmitting a signal for driving the light-emitting unit through the via 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It should be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG. 1A  is a schematic view of a light-emitting device in some embodiments of the present disclosure. 
         FIG. 1B  is an enlarged view of the light-emitting device in  FIG. 1A . 
         FIG. 2  is a schematic view of a light-emitting device in some embodiments of the present disclosure. 
         FIG. 3A  and  FIG. 3B  are schematic views of some light-emitting devices in some embodiments of the present disclosure. 
         FIG. 4  is a schematic view of a light-emitting device in some embodiments of the present disclosure. 
         FIG. 5  is a schematic view of a light-emitting device in some embodiments of the present disclosure. 
         FIG. 6  is a schematic view of a light-emitting device in some embodiments of the present disclosure. 
         FIG. 7A  to  FIG. 7H  are schematic views of a method of forming a light-emitting device in some embodiments of the present disclosure. 
         FIG. 8A  to  FIG. 8G  are schematic views of a method of forming a light-emitting device in some embodiments of the present disclosure. 
         FIG. 9A  is a top view of a light-emitting device in some embodiments of the present disclosure. 
         FIG. 9B  is a cross-sectional view of the light-emitting device in  FIG. 9A  illustrated along a line B-B′. 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSURE 
     The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are in direct contact, and may also include embodiments in which additional features may be disposed between the first and second features, such that the first and second features may not be in direct contact. 
     In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Moreover, the formation of a feature on, connected to, and/or coupled to another feature in the present disclosure that follows may include embodiments in which the features are in direct contact, and may also include embodiments in which additional features may be disposed interposing the features, such that the features may not be in direct contact. In addition, spatially relative terms, for example, “vertical,” “on,” “over,” “below,”, “bottom,” etc. as well as derivatives thereof (e.g., “downwardly,” “upwardly,” etc.) are used in the present disclosure for ease of description of one feature&#39;s relationship to another feature. The spatially relative terms are intended to cover different orientations of the device, including the features. 
     Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should be appreciated that each term, which is defined in a commonly used dictionary, should be interpreted as having a meaning conforming to the relative skills and the background or the context of the present disclosure, and should not be interpreted in an idealized or overly formal manner unless defined otherwise. 
     The terms “about” and “substantially” typically mean+/−20%, +/−10%, +/−5%, +/−3%, +/−2%, +/−1%, or +/−0.5% of the stated value. The stated value of the present disclosure is an approximate value. When there is no specific description, the stated value includes the meaning of “about” or “substantially”. 
     In addition, in some embodiments of the present disclosure, terms concerning attachments, coupling and the like, such as “connected” and “interconnected”, refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. Moreover, in some embodiments, the terms may include two elements are electrically connected to each other or the two elements are not in direct contact with each other. 
     Furthermore, the phrase “in a range between a first value and a second value” or “in a range from a first value to a second value” indicates that the range includes the first value, the second value, and other values between them. 
       FIG. 1A  is a schematic view of a light-emitting device  100  in some embodiments of the present disclosure, and  FIG. 1B  is an enlarged view of a portion A 1  of the light-emitting device  100  in  FIG. 1A . The light-emitting device  100  may include a flexible substrate  10 , a conductive layer  20 , a conductive layer  22 , a barrier layer  30 , a protective layer  40 , and a light-emitting unit C, but not limited thereto. In  FIG. 1B , the flexible substrate  10  may include vias V, and may include a top surface  10 A and a bottom surface  10 B. The conductive layer  20  may be disposed on the bottom surface  10 B of the flexible substrate  10 . The conductive layer  22  may be disposed on the top surface  10 A of the flexible substrate  10  and in the vias V. In some embodiments, the conductive layer  22  may cover the sidewalls of the vias V and the conductive layer  20 . The conductive layer  22  may directly or indirectly contact the sidewalls of the vias V and/or the conductive layer  20 , but not limited thereto. The barrier layer  30  may be disposed on the conductive layer  20  and the conductive layer  22 . The protective layer  40  may be disposed on the barrier layer  30 . The light-emitting unit C may be disposed on the top surface  10 A of the flexible substrate  10 , and the protective layer  40  may be disposed between the light-emitting unit C and the barrier layer  30 . In some embodiments, the light-emitting unit C may be electrically connected to the conductive layer  20  through the protective layer  40  and the barrier layer  30 . In other embodiments, reaction may occur when the protective layer  40  is connected to the light-emitting unit C to allow the light-emitting unit C in direct contact with the barrier layer  30  (not shown), but it is not limited thereto. 
     In some embodiments, the flexible substrate  10  may include a base and/or circuits disposed in the base. The base may include polymer material, such as polycarbonate (PC), polyimide (PI), polypropylene (PP), polyethylene terephthalate (PET), another suitable material, or a combination thereof, but the present disclosure is not limited thereto. The circuit in the base may include passive matrix (PM) circuit, active matrix (AM) circuit, etc. For example, the flexible substrate  10  may be multi-layered, but not limited thereto. 
     In some embodiments, the material of the conductive layer  20  and/or the conductive layer  22  may include conductive material, such as Cu, Ag, Al, Au, Mo, Ti, W, Sn, Ni, another suitable material or a combination thereof, but the present disclosure is not limited thereto. The material of the barrier layer  30  may include metal (such as Ni, Pt, Ag, Au, Cu, or an alloy thereof), another suitable material, or a combination thereof, but the present disclosure is not limited thereto. In an embodiment, the conductive layer  20 , the conductive layer  22 , the barrier layer  30 , and the protective layer  40  may include substantially identical material(s). In this embodiment, the barrier layer  30  and the protective layer  40  may be considered as an identical layer to the conductive layer  20  and/or the conductive layer  22 , but the present disclosure is not limited thereto. 
     The conductive layer  20  and the conductive layer  22  may be located at opposite sides of the flexible substrate  10 , and electric signals may be transmitted through both sides of the flexible substrate  10 . The barrier layer  30  may be used for protecting the conductive layer  20  and/or the conductive layer  22 , for example, the barrier layer  30  may reduce the chances of the material of the conductive layer  20  and/or the conductive layer  22  diffusing to other elements and resulting in the change of the resistance. The protective layer  40  may protect the conductive layer  20 , the conductive layer  22 , and/or the barrier layer  30  from being reacted to external environment (e.g. oxidation). 
     In the normal direction of the flexible substrate  10  (e.g. the Z direction), the thickness T 2  of the conductive layer  20  or the thickness T 3  of the conductive layer  22  may be less than the thickness T 1  of the flexible substrate  10 . The thickness T 2  of the conductive layer  20  may be the maximum thickness of the conductive layer  20  on the bottom surface of the flexible substrate  10 . The thickness T 3  of the conductive layer  22  may be the thickness of the conductive layer  22  at the center region of the via V or the thickness of the conductive layer  22  on the top surface  10 A, but not limited thereo. For example, in some embodiments, the thickness T 1  of the flexible substrate  10  may be less than or equal to about 150 μm, such as 120 μm, 100 μm, 80 μm, 50 μm, or 30 μm, but it is not limited thereto. The thickness T 2  of the conductive layer  20  or the thickness T 3  of the conductive layer  22  may be less than or equal to about 100 μm, such as 80 μm, 60 μm, 50 μm, 30 μm, or 10 μm. Furthermore, in some embodiments, the thickness T 2  of the conductive layer  20  may be substantially identical to the thickness T 3  of the conductive layer  22 , but it is not limited thereto. By making the thickness T 1  of the flexible substrate  10  less than about 150 μm, or making the thickness T 2  of the conductive layer  20  or the thickness T 3  of the conductive layer T 3  less than about 100 μm, the size of the light-emitting device  100  may be reduced to achieve miniaturization. 
     In some embodiments, the light-emitting unit C may include, for example, light-emitting diode (LED), other suitable elements or a combination thereof, but it is not limited thereto. The light-emitting diode may include inorganic light-emitting diode, organic light-emitting diode (OLED), mini LED, micro LED, quantum dot (QD), quantum dot light-emitting diode (QLED/QDLED), fluorescence material, phosphor material, another suitable material, or a combination thereof, but it is not limited thereto. In some embodiments, a package structure P 1  may be disposed on the light-emitting unit C to protect the light-emitting unit C. In some embodiments, the material of the package structure P 1  may include organic polymer, inorganic polymer, glass, or a combination thereof, but it is not limited thereto. In some embodiments, the package structure P 1  may be transparent or translucent to allow the light emitted from the light-emitting unit C passing through, but it is not limited thereto. 
       FIG. 2  is a schematic view of a light-emitting device  200  in some embodiments of the present disclosure. The flexible substrate  10  of the light-emitting device  200  may include at least one thin-film transistor (TFT) T, for example, the at least one thin-film transistor T may be disposed on the base (not shown) to drive other elements (such as the light-emitting unit C), but it is not limited thereto. In some embodiments, the thin-film transistor T may include a top gate thin-film transistor, a bottom gate thin-film transistor, a double gate thin-film transistor and/or a dual gate thin-film transistor, or a combination thereof, but it is not limited thereto. In some embodiments, the thin-film transistor T may include semiconductor materials, such as amorphous silicon, polysilicon (such as low temperature polysilicon (LTPS)), semiconductor oxide (such as indium gallium zinc oxide (IGZO)), other metal oxide, another suitable material, or a combination thereof, but it is not limited thereto. In some embodiments, different thin-film transistors T may include different semiconductor materials, but it is not limited thereto. For example, a thin-film transistor T may include low temperature polysilicon, and another thin-film transistor T may include semiconductor oxide, but it is not limited thereto. 
     Moreover, the light-emitting device  200  may further include a supporting layer  50  and a connecting layer  60  disposed between the flexible substrate  10  and the supporting layer  50 . The supporting layer  50  may be disposed on one side of the flexible substrate  10  that is away from the light-emitting unit C. In other words, the flexible substrate  10  may be disposed between the supporting layer  50  and the light-emitting unit C. The material of the supporting layer  50  may include glass, aluminum, or another suitable material, but it is not limited thereto. In an embodiment, the supporting layer  50  may include a circuit board, but it is not limited thereto. In some embodiments, the hardness of the supporting layer  50  may be greater than the hardness of the flexible substrate  10  to enhance the strength of the light-emitting device  200 . The material of the connecting layer  60  may include epoxy glue, silicon glue, photoresist, other suitable adhesives, or a combination thereof, but it is not limited thereto. The connecting layer  60  may be used for connecting the flexible substrate  10  and the supporting layer  50 . Moreover, in some embodiments, the connecting layer  60  may be used to reduce the chance of corrosion or oxidation of the conductive layer  20 , the barrier layer  30 , or the protective layer  40  caused by exposure to the external environment, thereby protecting the conductive layer  20 , the barrier layer  30 , or the protective layer  40 . In some embodiments, after the light-emitting device  200  having the supporting layer  50  is formed, the supporting layer  50  and the connecting layer  60  may be replaced by suitable flexible materials, such as polyimide, a flexible circuit board, or polyethylene terephthalate (PET), to achieve a light-emitting device having a flexible substrate, but it is not limited thereto. 
       FIG. 3A  and  FIG. 3B  are schematic views of a light-emitting device  300 A and a light-emitting device  300 B, respectively, in some embodiments of the present disclosure. In the light-emitting device  300 A, the thin-film transistors T and the light-emitting units C may be disposed on the same side of the base (not shown), and may be electrically connected to other elements via the circuit disposed on another side of the base to allow the thin-film transistors T to receive the signal. In the light-emitting device  300 B, the thin-film transistors T and the light-emitting units C may be disposed on opposite sides of the base (not shown) to meet different processing needs or design requirements. It should be noted that some circuits connected to the thin-film transistors T are omitted in  FIG. 3B  for simplicity. 
     In some embodiments, at least one opening O may be formed in the supporting layer  50  and/or the connecting layer  60 , and various elements may be disposed on the side of the flexible substrate  10  that no light-emitting unit is disposed thereon. In some embodiments, the opening O may completely or partially penetrate the connecting layer  60 . For example, as shown in  FIG. 3A  and  FIG. 3B , an electronic element  70  may be disposed in the opening O, i.e. disposed adjacent to the bottom surface  10 B of the flexible substrate  10 . In some embodiments, the electronic element  70  may include a connector, a semiconductor chip, other suitable electronic elements, or a combination thereof. In other embodiments, as shown in  FIG. 3B , the thin-film transistors T and the light-emitting units C may be disposed on opposite sides of the base, and the space on the top surface  10 A of the flexible substrate  10  for disposing the light-emitting units C may be increased. The electronic element  70  may provide electrical connection for the light-emitting units C or the thin-film transistors T to the external environment through the circuit and the vias V, for example, the electronic element  70  may be used to transmit a signal for driving the light-emitting units C and/or the thin-film transistors T. Furthermore, the conductive layer  20 , the barrier layer  30 , or the protective layer  40  may also be electrically connected to external environment through the electronic element  70 , but it is not limited thereto. In an embodiment, the semiconductor chip may be used to control the elements in the light-emitting device  300 A or the light-emitting device  300 B, such as the light-emitting units C, the thin-film transistors T, etc. The size of the light-emitting device  300 A or the light-emitting device  300 B may be reduced by disposing the semiconductor chip in the opening O. In some embodiments, the thickness of the semiconductor chip may be less than the sum of the thicknesses of the supporting layer  50  and the connecting layer  60  in the normal direction of the flexible substrate  10  (Z direction), and the semiconductor chip may be protected in the opening O, but it is not limited thereto. In other embodiments, the thickness of the semiconductor chip may be greater than the sum of the thicknesses of the supporting layer  50  and the connecting layer  60 . In some embodiments, both of the connector and the semiconductor chip may be disposed in the light-emitting device, depending on design requirements. 
     In some embodiments, as shown in  FIG. 3B , more than one light-emitting units C may be packaged in a single package structure P 2  to simplify the process. Although the light-emitting units C and the thin-film transistor T in  FIG. 3A  are disposed on the same side of the base and the light-emitting units C are respectively packaged by different package structures P 1  in  FIG. 3A , the light-emitting units C and the thin-film transistor T in  FIG. 3B  are disposed on opposite sides of the base and the light-emitting units C are packaged by a single package structure P 2  in  FIG. 3B , the present disclosure is not limited thereto. For example, the present disclosure also includes embodiments that the light-emitting units C and the thin-film transistor T are disposed on the same side of the base, and the light-emitting units C are packaged by a single package structure P 2 , and embodiments that the light-emitting units C and the thin-film transistor T are disposed on opposite sides of the base, and the light-emitting units C are respectively packaged by different package structures P 1 , depending on design requirements. 
       FIG. 4  is a schematic view of a light-emitting device  500  in some embodiments of the present disclosure. The light-emitting device  500  is substantially identical to the light-emitting device  100 , and the difference is that vias V′ of the light-emitting device  500  have tapered (or inclined) sidewalls, and other similar structures are not repeated herein. The included angle θ between the sidewall  12  of the via V′ and the bottom surface  10 B of the flexible substrate  10  may be between 30 degrees and 120 degrees (30 degrees≤angle θ≤120 degrees), such as 50 degrees, 60 degrees, 70 degrees, 90 degrees, 100 degrees, or 110 degrees, but not limited thereto. Therefore, the conductive layer  20  may be able to form a contact with the conductive layer  22  more easily, or the conductive layer  22  may be harder to break. 
       FIG. 5  is an enlarged view of a light-emitting device  600  in some embodiments of the present disclosure. It should be noted that the aforementioned light-emitting units C are not shown in the light-emitting device  600  for simplicity. After the conductive layer  22 , the barrier layer  30 , and the protective layer  40 , etc. are disposed in the via V of the flexible substrate  10 , a bonding material  80  may be additionally disposed in the via V. The bonding material  80  may include silver paste, copper paste, nano-metal powder, solder, another suitable material, or a combination thereof, but it is not limited thereto. The bonding material  80  may be used for electrically connecting conductive structures (such as the conductive layer  22 , the barrier layer  30 , the protective layer  40 ) and other elements (e.g. the light-emitting unit C), but it is not limited thereto. In an embodiment, because the bonding material  80  may be filled in the space of the via V, the mechanical strength of the via V of the light-emitting device  600  in the duration of the manufacturing process(es) may be enhanced, but it is not limited thereto. 
       FIG. 6  is a schematic view of a light-emitting device  700  in some embodiments of the present disclosure. The difference between the light-emitting device  700  and the light-emitting devices in aforementioned embodiments is that conductive material  26  may be included in the vias V, and the conductive layer  22  may be electrically connected to the conductive layer  20  through the conductive material  26 . The conductive material  26  may include metal (such as Cu, Ag, Au, Al, Ni, W, Sn or an alloy thereof), another suitable material, or a combination thereof, but it is not limited thereto. Therefore, the conductive layer  20  and the conductive layer  22  that are disposed on opposite sides of the flexible substrate  10  may be electrically connected to each other. 
       FIG. 7A  to  FIG. 7H  are schematic views of a method for forming a light-emitting device (e.g. the light-emitting device  100 ) in some embodiments of the present disclosure. In  FIG. 7A , a supporting substrate  91  is provided, and the flexible substrate  10  may be connected to the supporting substrate  91  through an adhesive layer  92 . The flexible substrate  10  may include thin-film transistors. In other embodiments, a base (not shown) may be connected to the supporting substrate  91 , and then forming a circuit layer or thin-film transistors (not shown) on the base to form the flexible substrate  10 . The material of the supporting substrate  91  may include glass or another suitable material, but it is not limited thereto. The material of the adhesive layer  92  may include epoxy glue, silicon glue, photoresist, optical clear adhesive, optical clear resin, another suitable material, or a combination thereof, but it is not limited thereto. In some embodiments, the hardness of the supporting substrate  91  may be greater than the hardness of the flexible substrate  10  to support the flexible substrate  10  in subsequent processes. In some embodiments, the flexible substrate  10  may include the aforementioned thin-film transistors T. In an embodiment, the adhesive layer  92  may be not required, and the flexible substrate  10  may be formed on the supporting substrate  91  by coating to simplify the process. For example, the base of the flexible substrate  10  may be formed on the supporting substrate  91  by coating in the beginning, and then forms the circuit layer of the flexible substrate  10 . 
     Afterwards, in  FIG. 7B , the conductive layer  20  may be disposed on the flexible substrate  10 , and the conductive layer  20  may be patterned. In some embodiments, the patterned conductive layer  20  may be disposed or formed by sputter, plating, photolithography, and/or printing, but it is not limited thereto. 
     In  FIG. 7C , the barrier layer  30  and/or the protective layer  40  may be disposed on the conductive layer  20 . The barrier layer  30  and/or the protective layer  40  may be disposed or formed by electroplating, chemical plating, etc., but it is not limited thereto. In  FIG. 7D , the supporting layer  50  may be connected to the flexible substrate  10  through the connecting layer  60 , and the connecting layer  60  may surround the conductive layer  20 , the barrier layer  30 , and the protective layer  40 . Afterwards, in  FIG. 7E , the whole structure may be flipped over, and the flexible substrate  10  is above the supporting layer  50 . The supporting substrate  91  and the adhesive layer  92  may be removed by chemical etching, laser lift-off or mechanical peeling, and then the vias V may be formed in the flexible substrate  10  by laser and/or lithography, but it is not limited thereto. In  FIG. 7F , the conductive layer  22 , the barrier layer  30 , and the protective layer  40  may be formed on the flexible substrate  10  and in the vias V. The conductive layer  22  may be formed by sputtering, electroplating, lithography, etc., and the barrier layer  30  and the protective layer  40  may be disposed or formed by electroplating, chemical plating, etc., but it is not limited thereto. In some embodiments, after the step in  FIG. 7F , as shown in  FIG. 7G , the supporting layer  50  and/or the connecting layer  60  may be removed. In some embodiments, after the step in  FIG. 7F , as shown in  FIG. 7H , the supporting layer  50  and/or the connecting layer  60  may remain. No matter the supporting layer  50  and the connecting layer  60  are removed or remain, the light-emitting unit C may be disposed on the flexible substrate  10  and electrically connected to other elements (not shown) on the flexible substrate  10  through the conductive layer  20 , the conductive layer  22 , the barrier layer  30 , and the protective layer  40 . However, the present disclosure is not limited thereto. A new supporting layer and/or a new connecting layer may be formed after the step in  FIG. 7G . 
       FIG. 8A  to  FIG. 8G  are schematic views of another method for forming a light-emitting device (e.g. the light-emitting device  100 ) in some embodiments of the present disclosure. In  FIG. 8A , a supporting substrate  93  and a sacrificial layer  94  that is disposed on the supporting substrate  93  are provided. The material and function of the supporting substrate  93  may be the same or similar to the supporting substrate  91 , and it is not repeated here. The material of the sacrificial layer  94  may include glue, photoresist, amorphous silicon, polymer, another suitable material or a combination thereof, but the present disclosure is not limited thereto. 
     In  FIG. 8B , the conductive layer  20  may be formed on the sacrificial layer  94 . In  FIG. 8C , the flexible substrate  10  may be provided on the sacrificial layer  94 . A layer of suitable material for substrate (e.g. the material of the flexible substrate  10 ) may be coated on the sacrificial layer  94 , and active elements (e.g. the thin-film transistors T) or circuit layer(s) may be disposed in the material for substrate to form the flexible substrate  10 , but it is not limited thereto. 
     In  FIG. 8D , vias V may be formed on the flexible substrate  10 , and the positions of the vias V may correspond to the conductive layer  20 . In  FIG. 8E , the conductive layer  22 , the barrier layer  30 , and the protective layer  40  may be formed on the flexible substrate  10  and the vias V. 
     In  FIG. 8F , the supporting substrate  93  and the sacrificial layer  94  may be removed to expose the conductive layer  20 . The supporting substrate  93  and the sacrificial layer  94  may be removed by laser, chemical etching, etc. but it is not limited thereto. In an embodiment, a portion of the flexible substrate  10  may be removed, but it is not limited thereto. Afterwards, the barrier layer  30  and the protective layer  40  may be formed on the conductive layer  20 . Finally, in  FIG. 8G , the light-emitting unit C may be disposed on the flexible substrate  10  and electrically connected to other elements (not shown) on the flexible substrate  10  through the conductive layer  20 , the conductive layer  22 , the barrier layer  30 , and the protective layer  40  to form the light-emitting device. 
     In some embodiments, the light-emitting device may be an LED light-emitting device. For example,  FIG. 9A  is a top view of a light-emitting device  1000  in some embodiments of the present disclosure, and  FIG. 9B  is a cross-sectional view of the light-emitting device in  FIG. 9A  illustrated along the line B-B′. The light-emitting device  1000  may include, for example, a light-emitting unit C 1 , a light-emitting unit C 2 , and a light-emitting unit C 3 . In some embodiments, the color of light emitted from light-emitting unit C 1 , light-emitting unit C 2 , and light-emitting unit C 3  may be different (such as red, green, blue, yellow) or they may have the same color, but it is not limited thereto. In some embodiments, the substrate may have a high accuracy in the manufacturing processes in the present disclosure. The P-N gap between the anode and the cathode of light-emitting unit C 1 , light-emitting unit C 2 , and light-emitting unit C 3  may be less than 50 μm to achieve miniaturization. 
     As shown in  FIG. 9A  and  FIG. 9B , the cathodes or the anodes of light-emitting unit C 1 , light-emitting unit C 2 , and light-emitting unit C 3  (e.g. the cathodes) may be electrically connected to a conductive structure E 1  (including the conductive layer  22 , the barrier layer  30 , and the protective layer  40 ) disposed on the top surface  10 A of the flexible substrate  10 , and may electrically connect to a conductive structure D 1  (including the conductive layer  22 , the barrier layer  30 , and the protective layer  40 , shown as a dashed line in  FIG. 9A ) disposed on the bottom surface  10 B of the flexible substrate  10  through a via V 1 . In other words, the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  may have a common electrode (cathode or anode). As a result, the number of required electrodes may be reduced. In an embodiment, a portion of the conductive structure E 1  may overlap the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  in the top view. 
     Other electrodes of the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  (e.g. anodes) may be respectively connected to the conductive structure E 2 , the conductive structure E 3 , the conductive structure E 4  (including the conductive layer  22 , the barrier layer  30 , the protective layer  40 ) on the top surface  10 A of the flexible substrate  10 , and then electrically connected to the conductive structure D 2 , the conductive structure D 3 , the conductive structure D 4  (including the conductive layer  20 , the barrier layer  30 , the protective layer  40 , shown as a dashed line in  FIG. 9A ) on the bottom surface  10 B of the flexible substrate  10 . In other words, the cathodes and the anodes of the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  are electrically separated. In an embodiment, a portion of the conductive structure E 2  may overlap the light-emitting unit C 1  in the top view. A portion of the conductive structure E 3  may overlap the light-emitting unit C 2  in the top view. A portion of the conductive structure E 4  may overlap the light-emitting unit C 3  in the top view. However, the present disclosure is not limited thereto. It is possible that only two of the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  have a common electrode, or the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  may not have any common electrode. Therefore, the light-emitting unit C 1 , the light-emitting unit C 2 , and the light-emitting unit C 3  may be controlled separately. 
     In summary, a light-emitting device having a substrate with high accuracy is provided in some embodiments of the present disclosure. The accuracy of the substrate is increased, and the size of the substrate may be reduced to achieve miniaturization. It should be noted that the material, the thickness of the material, the profile and structure of the elements, the circuits are only examples, and the size or ranges are only used for illustration, the present is not limited thereto. 
     The light-emitting device may have touch-control functionality to act as a touch electronic device. Furthermore, the light-emitting device or the touch electronic device in the embodiments of the present disclosure may be applied in any electronic devices with a display screen, such as a display, a mobile phone, a watch, a laptop computer, a video camera, a camera, a mobile navigation device, or a television. These are merely examples, and the applications of the present disclosure are not limited thereto. The aforementioned electronic device may include a display device, an antenna device, a sensing device or a tiled device, a bendable or flexible electronic device, but it is not limited thereto. The light-emitting device of the aforementioned embodiments of the present disclosure may be applied in an electronic device that has an antenna, or in other types of electronic devices. Furthermore, the light-emitting device in aforementioned embodiments may be used as a backlight module of the display device. Since the aforementioned embodiments in the disclosure may perform substantially the same function and obtain substantially the same results, some embodiments of the present disclosure may be combined without conflicting with the spirit of the disclosure. 
     Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, and composition of matter, means, methods and steps described in the specification. The features of different embodiments of the present disclosure may be combined, replaced, or rearranged to form another embodiment. As one of ordinary skill in the art will readily appreciate from the disclosure of the present disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope of such processes, machines, manufacture, and compositions of matter, means, methods, or steps. In addition, each claim constitutes a separate embodiment, and the combination of various claims and embodiments are within the scope of the disclosure.