Patent Publication Number: US-2022223436-A1

Title: Etching device and etching method using the same

Description:
This application claims priority under to Korean Patent Application No. 10-2021-0003393 filed on Jan. 11, 2021, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference. 
     BACKGROUND 
     1. Field 
     Embodiments relate to an etching device and an etching method using the same. 
     2. Description of the Related Art 
     In general, a tiled display device may include a plurality of display devices to implement a large screen. In this case, a bezel positioned at a boundary between the display devices may be visually recognized by a user, so that display quality of the tiled display device may be degraded. 
     Accordingly, a back bonding may be used when manufacturing the tiled display device so that the bezel is not visible to a user. In order to perform the back bonding, some area of a substrate may be etched. 
     SUMMARY 
     Embodiments provide an etching device with improved etching quality. 
     Embodiments provide an etching method with improved etching quality. 
     An etching device according to an embodiment includes a nozzle unit including at least one nozzle including an etching solution injection hole, an etching solution collection hole, and a sealing part, where the etching solution injection hole is configured to provide an etching solution to an etching object, the etching solution collection hole is configured to collect the etching solution, and the sealing part surrounds the etching solution injection hole and the etching solution collection hole to prevent the etching solution from leakage. 
     In an embodiment, the sealing part may include a fluorine-based rubber. 
     In an embodiment, the sealing part may be disposed in an edge of the nozzle, and the sealing part may surround the entire edges of an etching area of the etching object in a plan view. 
     In an embodiment, the sealing part may include at least one sealing ring. 
     In an embodiment, the etching object may include an etching area and a non-etching area, the etching area may be an area on which the etching solution is provided, and the non-etching area may be the remaining area of the etching object excluding the etching area, and the sealing part may contact with an edge of the etching area. 
     In an embodiment, the sealing part may place the etching solution in a sealed space sealed by the sealing part. 
     In an embodiment, the etching area may be an area to be bonded to a circuit member. 
     In an embodiment, the etching object may include a substrate, and the substrate may include the etching area and the non-etching area. 
     In an embodiment, the substrate may include polyimide (“PI”). 
     In an embodiment, the nozzle may further include a piping part and a heating part, the piping part may be connected to the etching solution injection hole and be configured to provide the etching solution to the etching solution injection hole, and the heating part may be disposed around the piping part and be configured to control a temperature of the etching solution. 
     In an embodiment, the etching device may further include a fixing member which fixes the etching object. 
     An etching method according to an embodiment includes: contacting a nozzle unit to a lower surface of an etching object, where the nozzle unit includes at least one nozzle including an etching solution injection hole, an etching solution collection hole, and a sealing part, the etching solution injection hole provides an etching solution to an etching object, the etching solution collection hole collects the etching solution, and the sealing part surrounds the etching solution injection hole and the etching solution collection hole to prevent the etching solution from leakage; and etching the etching object by spraying the etching solution to the lower surface of the etching object through the etching solution injection hole. 
     In an embodiment, the nozzle unit may contact the lower surface of the etching object such that the sealing part surrounds the entire edges of an etching area of the etching object in a plan view. 
     In an embodiment, the etching object may include an etching area and a non-etching area, the etching area may be an area on which the etching solution is provided, the non-etching area may be the remaining area of the etching object excluding the etching area, and the sealing part may contact with an edge of the etching area. 
     In an embodiment, the etching object may include a substrate. 
     In an embodiment, the substrate may include the etching area and the non-etching area. 
     In an embodiment, the etching method may further include detaching the substrate from an auxiliary substrate before the nozzle unit contacts the lower surface of the etching object, fixing the etching object to a fixing member and moving the nozzle unit in a direction to the etching object. 
     In an embodiment, the sealing part may place the etching solution in a sealed space sealed by the sealing part. 
     In an embodiment, the sealing part may include a fluorine-based rubber. 
     In an embodiment, the etching method may further include cleaning the etching solution by spraying a cleaning solution by a cleaning unit after the etching object is etched and removing the cleaning solution by a drying unit. 
     In an etching device according to embodiments of the present invention, the etching device may be disposed under an etching object. The etching device may be disposed under the etching object to etch the bottom surface of the etching object. Accordingly, an etching solution for etching the etching object may etch only an etching area. Accordingly, an accuracy of the etching may be improved, and quality of the etching object may be improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view illustrating an etching device according to an embodiment of the present invention. 
         FIG. 2  is a plan view illustrating a display device that is an example of an etching object according to an embodiment. 
         FIG. 3  is a block diagram illustrating a display device according to an embodiment of the present invention. 
         FIG. 4  is a plan view illustrating a display device according to an embodiment of the present invention. 
         FIG. 5  is a cross-sectional view taken along line I-I′ of  FIG. 4 . 
         FIG. 6  is a cross-sectional view illustrating an example cut along line II-IP of  FIG. 4 . 
         FIG. 7  is a rear view illustrating an example of a first substrate included in a display device. 
         FIG. 8  is an enlarged cross-sectional view of an area A of  FIG. 1 . 
         FIG. 9  is a plan view illustrating an example of a nozzle included in the etching device of  FIG. 1 . 
         FIG. 10  is a cross-sectional view taken along line III-III′ of  FIG. 9 . 
         FIG. 11  is a plan view illustrating another example of the nozzle. 
         FIG. 12  is a plan view illustrating still another example of the nozzle. 
         FIG. 13  is a cross-sectional view illustrating an example of a cleaning unit included in an etching device. 
         FIG. 14  is a cross-sectional view illustrating an example of a drying unit included in an etching device. 
         FIGS. 15 to 19  are cross-sectional views illustrating an etching method according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, display devices in accordance with embodiments will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components will be omitted. 
       FIG. 1  is a plan view illustrating an etching device according to an embodiment of the present invention. 
     Referring to  FIG. 1 , an etching device  1  includes a nozzle unit  30 , a fixing member  20 , a cleaning unit (for example, the cleaning unit  50  of  FIG. 13 ), and a drying unit (for example, the drying unit  60  of  FIG. 14 ). The nozzle unit  30  may include one or more nozzles  1000 . In another embodiment, the nozzle unit  30  may include only one nozzle  1000 . 
     The etching device  1  may etch an etching object  40 . For example, the etching object  40  may be a display device  10 . 
       FIG. 2  is a plan view illustrating a display device that is an example of an etching object according to an embodiment. 
     Referring to  FIGS. 1 and 2 , the etching device  1  according to an embodiment of the present invention may etch the etching object  40 . The etching object  40  may be a tiled display device including a plurality of display devices. The display devices may display individual images or may divide and display one image. The display devices may include display panels of the same type, structure, size, or method, but the invention is not limited thereto. 
     The display devices may be arranged in a matrix form along a first direction DR 1  and a second direction DR 2  crossing the first direction DR 1 . For example, as illustrated in  FIG. 2 , the tiled display device may include first to ninth display devices  10   a  to  10   i  arranged in a 3×3 form on a plan view (i.e., view in a third direction DR 3 ). Each of the first to ninth display devices  10   a  to  10   i  may display first to ninth images. A user may view an image in which the first to ninth images are combined. However, embodiments of the present invention are not limited thereto, and the tiled display device may include 2 to 8 or 10 or more display devices. 
       FIG. 3  is a block diagram illustrating a display device according to an embodiment of the present invention. For example, a display device  10  of  FIG. 3  may represent any one of the first to ninth display devices  10   a  to  10   i  of  FIG. 1 . 
     Referring to  FIG. 3 , the display device  10  may include a display panel DP and a driving unit. The driving unit may include a driving controller CON, a gate driver GDV, and a data driver DDV. 
     The display panel DP may include pixels PX, gate lines GL, and data lines DL. The pixels PX may be disposed in a display area for displaying an image. The pixels PX may be electrically connected to the gate lines GL and the data lines DL. For example, the pixels PX may be arranged in a matrix shape along the first direction DR 1  and the second direction DR 2 . For example, the second direction DR 2  may be perpendicular to the first direction DR 1 . Each of the pixels PX may include a thin film transistor and a light emitting diode. The light emitting diode may generate light. The light emitting diode may be an inorganic light emitting diode or an organic light emitting diode. 
     The gate lines GL and the data lines DL may cross each other. For example, each of the gate lines GL may generally extend in the second direction D 2  and may be arranged along the first direction D 1 . Each of the data lines DL may generally extends in the first direction D 1  and may be arranged along the second direction D 2 . 
     The driving controller CON may generate a gate control signal GCTRL, a data control signal DCTRL, and an output image data ODAT based on an input image data IDAT and an input control signal CTRL provided from an external device. For example, the input image data IDAT may be RGB data including red image data, green image data, and blue image data. The input control signal CTRL may include a master clock signal and an input data enable signal. The input control signal CTRL may further include a vertical synchronization signal and a horizontal synchronization signal. 
     The gate driver GDV may generate gate signals based on the gate control signal GCTRL provided from the driving controller CON. For example, the gate control signal GCTRL may include a vertical start signal and a gate clock signal. The gate driver GDV may sequentially output the gate signals to the gate lines GL of the display panel DP. 
     The data driver DDV may generate data signals based on the data control signal DCTRL and the output image data ODAT provided from the driving controller CON. For example, the data control signal DCTRL may include an output data enable signal, a horizontal start signal, and a load signal. The data driver DDV may output the data signals to the data lines DL of the display panel DP. 
     In an embodiment, the gate driver GDV and the data driver DDV may be implemented as an integrated circuit. The gate driver GDV and the data driver DDV may include an IC chip, a substrate on which the IC chip is mounted, a film on which the IC chip is mounted, or the like. 
       FIG. 4  is a plan view illustrating a display device according to an embodiment of the present invention.  FIG. 5  is a cross-sectional view taken along line I-I′ of  FIG. 4 .  FIG. 6  is a cross-sectional view illustrating an example cut along line II-IP of  FIG. 4 . For example, a display device  10  of  FIG. 4  may represent any one of the first to ninth display devices  10   a  to  10   i  of  FIG. 2 . 
     Referring to  FIGS. 4 to 6 , the display device  10  may include a substrate layer  100 , a thin film transistor layer  200 , a light emitting diode layer  300 , an encapsulation layer  400 , a protective film  500 , and a driver  600 . 
     The substrate layer  100  may include a first substrate  110 , a second substrate  120 , a first barrier layer  131 , a second barrier layer  132 , and a connection wiring  140 . 
     The first substrate  110  may be a transparent insulating substrate. The first substrate  110  may have flexibility to enable bending. For example, the first substrate  110  may include polyimide (PI). In addition, the first substrate  110  may include polyether sulfone (“PES”), polyacrylate (“PAR”), polyetherimide (“PEI”), polyethylene naphthalate (“PEN”), polyethylene terephthalate (“PET”), polyphenylene sulfide (“PPS”), polycarbonate (“PC”), cellulose acetate propionate (“CAP”), or the like. 
     The connection wiring  140  may be disposed on the first substrate  110 . The connection wiring  140  may include a conductive material such as metal. The connection wiring  140  may electrically connect a thin film transistor and the driver  600 . For example, a second circuit board  620  may be connected to a first end  141  of the connection wiring  140 , and a pad electrode PD may be connected to a second end  142  of the connection wiring  140 . The second end  142  is opposite to the first end  141 . 
     The second substrate  120  may be disposed on the first substrate  110  and the connection wiring  140 . The second substrate  120  may be disposed between the connection wiring  140  and the thin film transistor layer  200 . For example, the second substrate  120  may include substantially the same material as the first substrate  110 . 
     The first barrier layer  131  and the second barrier layer  132  may be disposed between the first substrate  110  and the second substrate  120 . The first barrier layer  131  may be disposed between the first substrate  110  and the connection wiring  140 . The first barrier layer  131  may include an inorganic insulating material such as silicon oxide, silicon nitride, and silicon oxynitride. The first barrier layer  131  may improve adhesion between the first substrate  110  and the connection wiring  140 . 
     The second barrier layer  132  may be disposed between the connection wiring  140  and the second substrate  120 . The second barrier layer  132  may include an inorganic insulating material. The second barrier layer  132  may improve adhesion between the second substrate  120  and the connection wiring  140 . 
     The thin film transistor layer  200  may be disposed on the substrate layer  100 . The thin film transistor layer  200  may include at least one thin film transistor electrically connected to the pad electrode PD. The light emitting diode layer  300  may be disposed on the thin film transistor layer  200 . The light emitting diode layer  300  may include at least one light emitting diode electrically connected to the thin film transistor. The encapsulation layer  400  may be disposed on the light emitting diode layer  300 . The protective film  500  may be disposed on the encapsulation layer  400 . 
     The pad electrode PD may be disposed between the first substrate  110  and the thin film transistor layer  200 . The pad electrode PD may be disposed on the connection wiring  140 . That is, the connection wiring  140  may be disposed between the first substrate  110  and the pad electrode PD. The pad electrode PD may be electrically connected to the connection wiring  140  and the thin film transistor. The pad electrode PD may include a conductive material such as metal. 
     The second substrate  120  may have a first through-hole TH 1  overlapping the second end  142  of the connection wiring  140  in a plan view. The first through-hole TH 1  may penetrate the second substrate  120  and the second barrier layer  132 . The first through-hole TH 1  may expose at least a portion of the second end  142  of the connection wiring  140 . The pad electrode PD may be disposed on the second substrate  120  and may be electrically connected to the second end  142  of the connection wiring  140  through the first through-hole TH 1 . For example, the pad electrode PD may directly contact the connection wiring  140 . 
     The pad electrode PD may extend into the first through-hole TH 1 . For example, as illustrated in  FIG. 6 , the pad electrode PD may cover a side surface and a lower surface of the first through-hole TH 1 . 
     A filling member FM may be disposed inside the first through-hole TH 1 . The filling member FM may contact the pad electrode PD. The filling member FM may compensate a step by filling inside the first through-hole TH 1 . 
     The driver  600  may include a first circuit board  610 , a second circuit board  620 , and a driving integrated circuit. 
     The first circuit board  610  may be disposed under the first substrate  110 . The second circuit board  620  may electrically connect the first circuit board  610  and the connection wiring  140 . That is, the first circuit board  610  may be electrically connected to the thin film transistor through the second circuit board  620 , the connection wiring  140 , and the pad electrode PD. 
     A first end  621  of the second circuit board  620  may be connected to the connection wiring  140 . For example, the first end  621  of the second circuit board  620  may be attached on the first end  141  of the connection wiring  140  through a conductive adhesive member. For example, the conductive adhesive member may be an anisotropic conductive film. 
     A second end  622  of the second circuit board  620  may be connected to the first circuit board  610 . The second end  622  is opposite to the first end  621 . For example, the second end  622  of the second circuit board  620  may be attached on a first end  611  of the first circuit board  610  through the conductive adhesive member. For example, a second end  612  of the first circuit board  610  may be fixed on the lower surface of the first substrate  110 , but is not limited thereto. The second end  612  is opposite to the first end  611 . 
     The second circuit board  620  (e.g., the second end  622  of the second circuit board  620 ) may be bent under the first substrate  110 . For example, the second circuit board  620  may have a bending portion  623  capable of bending. The bending portion  623  of the second circuit board  620  may be defined between the first end  621  of the second circuit board  620  and the second end  622  of the second circuit board  620 . 
     Although not illustrated in the drawings, the driving integrated circuit may be mounted on the first circuit board  610  and/or the second circuit board  620 . For example, the driving controller CON of  FIG. 3  may be mounted on the first circuit board  610 . For example, the gate driver GDV and the data driver DDV of  FIG. 3  may be mounted on the second circuit board  620 . However, this is exemplary, and the etching object  40  according to the present invention is not limited thereto. 
       FIG. 7  is a rear view illustrating an example of a first substrate included in a display device. For example,  FIG. 7  may represent a state in which the first substrate  110  included in the display device  10  of  FIG. 4  is turned over left and right. 
       FIGS. 4 to 7 , in an embodiment, the first substrate  110  may include an etching area EA and a non-etching area NEA. 
     The etching area EA of the first substrate  110  may mean an area etched by the etching device (e.g., the etching device  1  of  FIG. 1 ). Accordingly, the etching area EA may mean an opening area penetrating the first substrate  110 . However, the present invention is not limited thereto, and in another embodiment, the etching area EA may have a predetermined thickness smaller than the thickness of the non-etching area NEA. The non-etching area NEA may mean a remaining area excluding the etching area EA etched by the etching device  1 . 
     The non-etching area NEA may overlap the pad electrode PD in a plan view. The non-etching area NEA of the first substrate  110  may overlap the second end  142  of the connection wiring  140 . The etching area EA may overlap the first end  141  of the connection wiring  140 . In addition, the etching area EA may overlap the first end  621  of the second circuit board  620  in a plan view. The first end  141  of the connection wiring  140  and the first end  621  of the second circuit board  620  may contact each other in the etching area EA. Accordingly, the etching area EA may be an area necessary for electrically connecting the thin film transistor and the first circuit board  610 . 
       FIG. 8  is an enlarged cross-sectional view of an area A of  FIG. 1 .  FIG. 9  is a plan view illustrating an example of a nozzle included in the etching device of  FIG. 1 .  FIG. 10  is a cross-sectional view taken along line III-III′ of  FIG. 9 . 
     Referring to  FIGS. 1, 8, 9, and 10 , the nozzle  1000  may include an etching solution injection hole  1100 , an etching solution collection hole  1200 , a sealing part  1300 , a piping part  1400 , and a heating part  1500 . 
     The etching solution injection hole  1100  may provide an etching solution  1600  to the etching object  40 . Specifically, the etching solution injection hole  1100  may provide the etching solution  1600  to the etching area EA of the etching object  40 . The etching solution injection hole  1100  may receive the etching solution  1600  through the piping part  1400 . The etching solution  1600  supplied from the piping part  1400  may be sprayed on a lower surface  40   a  of the etching object  40  through the etching solution injection hole  1100 . The sprayed etching solution  1600  may etch the etching object  40 . Specifically, the etching solution  1600  may etch the etching area EA of the etching object  40 . The etching solution  1600  may remain on the etching object  40  after etching the etching object  40 . 
     The etching solution  1600  may contain a strong base material. For example, the etching solution  1600  may contain KOH, or the like. The etching solution  1600  may include a material capable of removing the etching object  40 . Specifically, the etching solution  1600  may etch the first substrate  110  including PI. Therefore, the etching solution  1600  may include KOH, or the like that is capable of etching PI. 
     The etching solution collection hole  1200  may collect the etching solution  1600  remaining on the etching object  40  after etching. When the etching solution  1600  continues to remain in the etching object  40  even after etching the etching object  40 , the etching solution  1600  may also etch the non-etching area NEA around the etching area EA. The non-etching area NEA can also be etched. That is, the etching object  40  may be etched different from a predetermined pattern. Accordingly, in an embodiment according to the invention, the etching solution collection hole  1200  may collect the remaining etching solution  1600  after etching the etching area EA to prevent the non-etching area NEA from being etched. 
     The etching solution collection hole  1200  may be disposed in a center of the nozzle  1000 . The etching solution collection holes  1200  may have a rectangular shape in a plan view. The etching solution injection hole  1100  may be disposed surrounding the etching solution collection hole  1200 . The nozzle  1000  may include a plurality of the etching solution injection holes  1100 . The etching solution injection holes  1100  may be disposed around the etching solution collection hole  1200 . A portion between a portion of the nozzle  1000  in which the etching solution injection holes  1100  are defined and a portion of the nozzle  1000  in which the etching solution collection hole  1200  is defined may be inclined as shown in  FIG. 10 . That is, a portion of a upper surface of the nozzle  1000  in which the etching solution collection hole  1200  is defined may be disposed in a level lower than a level of a portion of the upper surface of the nozzle  1000  in which the etching solution injection holes  1100  are defined. Accordingly, the remaining etching solution  1600  may be collected near the etching solution collection hole  1200  along a slope of the upper surface of the nozzle  1000 . Accordingly, the etching solution collection hole  1200  may collect the remaining etching solution  1600  more easily. 
       FIG. 11  is a plan view illustrating another example of the nozzle. 
     Referring to  FIG. 11 , in this embodiment, the etching solution injection holes  1100  may be defined at a center of a nozzle  1001  and locations adjacent to long sides and short sides of the nozzle  1001 . In  FIG. 11 , five etching solution injection holes  1100  are illustrated as an example. Each of etching solution injection holes  1100  may have a rectangular shape in a plan view. Each of etching solution collection holes  1200  may be located between the etching solution injection holes  1100 . In  FIG. 11 , two etching solution collection holes  1200  are illustrated as an example. Like in  FIG. 9 , a portion between a portion of the nozzle  1001  in which the etching solution injection holes  1100  are defined and a portion of the nozzle  1001  in which the etching solution collection holes  1200  are may be inclined. Accordingly, the etching solution collection holes  1200  may collect the remaining etching solution  1600  more easily. 
       FIG. 12  is a plan view illustrating still another example of the nozzle. 
     Referring to  FIG. 12 , in this embodiment, the etching solution injection holes  1100  may be disposed adjacent to a center of a nozzle  1002  and long sides and short sides of the nozzle  1002 . Each of the etching solution injection holes  1100  may have a circular shape in a plan view. In  FIG. 12 , twenty eight etching solution injection holes  1100  are illustrated as an example. Each of the etching solution collection holes  1200  may be disposed between the etching solution injection holes  1100 . In  FIG. 11 , two etching solution collection holes  1200  are illustrated as an example. Like in  FIG. 9 , a portion between a portion of the nozzle  1002  in which the etching solution injection holes  1100  are defined and a portion of the nozzle  1002  in which the etching solution collection holes  1200  are defined may be inclined. Therefore, the etching solution collection holes  1200  may collect the remaining etching solution  1600  more easily. The nozzle  1002  according to  FIG. 12  may include more the etching solution injection holes  1100  and the etching solution collection holes  1200  than the nozzle  1000  according to  FIG. 9 . Accordingly, the nozzle  1002  according to  FIG. 12  may provide more of the etching solution  1600  to the etching object  40  at one time. In addition, the nozzle  1002  according to  FIG. 12  may collect more of the etching solution  1600  remaining on the etching object  40  at one time. Accordingly, a time required to perform an etching process of the etching object  40  may be effectively reduced. 
     Referring to  FIGS. 1, 8, 9, and 10 , in an embodiment, the sealing part  1300  may surround the etching solution injection hole  1100  and the etching solution collection hole  1200  in a plan view. That is, the etching solution injection hole  1100  and the etching solution collection hole  1200  may exist inside an area surrounded by the sealing part  1300 . The sealing part  1300  may be disposed in an edge of the nozzle  1000 . 
     The sealing part  1300  may prevent the etching solution  1600  from leaking from the etching area EA to the non-etching area NEA. The sealing part  1300  may entirely contact the etching object  40 . For example, the sealing part  1300  may contact a lower surface  110   a  of the first substrate  110 . The lower surface  40   a  of the etching object  40  may mean the lower surface  110   a  of the first substrate  110 . Specifically, the sealing part  1300  may contact to an edge of the etching area EA of the first substrate  110 . A material may not leak from inside of the sealing part  1300  to outside of the sealing part  1300 , by the sealing part contacting the etching area EA and attaching to the etching area EA. That is, the sealing part  1300  may prevent the etching solution  1600  from leaking from the etching area EA to the non-etching area NEA. 
     The etching solution injection hole  1100  and the etching solution collection hole  1200  are disposed in a center of the nozzle  1000 , and the sealing part  1300  is disposed in an edge of the nozzle  1000 , so that the etching solution  1600  may be located in a space sealed by the sealing part  1300 . In a plan view, a shape of the sealing part  1300  is illustrated in a square shape, but the shape of the sealing part  1300  according to the invention is not limited thereto. The shape of the sealing part  1300  may be determined according to a shape of the etching area EA. 
     The sealing part  1300  may have adhesiveness and may have elasticity. In addition, the sealing part  1300  may have excellent chemical resistance in order not to be damaged by the etching solution  1600 . The sealing part  1300  may include a fluorine-based rubber. For example, the sealing part  1300  may include at least one of a fluoroelastomer and a perfluoroelastomer. The fluorine-based rubber may have excellent chemical resistance to a strong basic liquid, which is the etching solution  1600 . Accordingly, the sealing part  1300  may not be damaged by the etching solution  1600  and leakage of the etching solution  1600  may be prevented. 
     The sealing part  1300  may include one or more sealing rings  1310 ,  1320 . When the sealing rings  1310 ,  1320  are two or more, leakage of the etching solution  1600  may be prevented more easily than when the sealing ring is one. For example, the sealing part  1300  may include a first sealing ring  1310  and a second sealing ring  1320 . The first sealing ring  1310  may be disposed closer to the etching solution collection hole  1200  and the etching solution injection hole  1100  than the second sealing ring  1320 . The second sealing ring  1320  may be disposed outside of the first sealing ring  1310 . Accordingly, the first sealing ring  1310  may primarily prevent leakage of the etching solution  1600 . When the etching solution  1600  leaks from the first sealing ring  1310 , the second sealing ring  1320  may prevent leakage of the leaked etching solution  1600 . Accordingly, leakage of the etching solution  1600  to the outside of the second sealing ring  1320  may be prevented. 
     Since the sealing part  1300  needs to contact the first substrate  110 , the nozzle unit  30  including the sealing part  1300  may further include a moving member. That is, the moving member may move the nozzle unit  30  up and down. The nozzle unit  30  may move in a third direction DR 3  by the moving member. By moving of the nozzle unit  30 , the sealing part  1300  included in the nozzle unit  30  may contact the lower surface  110   a  of the first substrate  110 . The etching solution  1600  may be provided from the etching solution injection hole  1100  to the first substrate  110  after the sealing part  1300  contacts the lower surface  110   a  of the first substrate  110  and the etching area is sealed. After the etching area EA of the first substrate  110  is etched, the nozzle unit  30  may move in a fourth direction DR 4  opposite to the third direction DR 3  to be disposed in an original position. 
     The piping part  1400  may be disposed inside the nozzle  1000 . The piping part  1400  may supply the etching solution  1600  to the etching solution injection hole  1100 . The piping part  1400  may be connected to a storage unit. The storage unit storing the etching solution  1600  may be disposed inside the etching device  1  or in another area outside the etching device  1 . The storage unit may supply the etching solution  1600  by being connected to the piping part  1400  inside the etching device  1 . 
     The heating part  1500  may be disposed around the piping part  1400 . The heating part  1500  may be built inside the nozzle  1000 . The heating part  1500  may heat the etching solution  1600  passing through the piping part  1400  by disposed around the piping part  1400 . Accordingly, the heating part  1500  may control or maintain a constant temperature of the etching solution  1600 . Since the etching solution  1600  etches the etching object  40  in an optimum temperature, a time required for etching the etching object  40  may be effectively reduced. 
     The nozzle unit  30  may include at least one nozzle  1000 . For example, as illustrated in the drawing, three or more nozzles  1000  may be included. That is, the number of the nozzles  1000  included in the nozzle unit  30  may be the same as the number of the etching areas EA. In addition, each of the nozzles  1000  may be disposed at the same position as each of the etching areas EA. 
     In an embodiment, since the nozzle  1000  includes the sealing part  1300 , only the etching area EA may be etched. In an etching process of a substrate included in an conventional display device, a photo process may be required to etch only the etching area of the substrate. The photo process may include a coating process, an exposure process, a development process and a removing process. Therefore, a process of manufacturing the display device may be complicated and may need a large cost. However, since the etching device  1  according to the present invention includes the sealing part  1300 , only the etching area EA may be etched. Accordingly, other devices except the nozzle unit  30 , the cleaning unit  50 , and the drying unit  60  included in the etching device  1  may not be additionally required. In addition, an additional coating process, the exposure process, and the development process may not be required except the process of moving the nozzle unit  30  up and down and etching the etching area EA. Accordingly, the process of manufacturing the display device may be simplified and cost may be effectively reduced. 
     Referring to  FIGS. 1 and 8 , the fixing member  20  included in the etching device  1  may fix the etching object  40 . For example, the fixing member  20  may be one of support members including an adsorption member and a clamp. When the fixing member  20  is the adsorption member, the adsorption member may include one or more vacuum holes. The adsorption member may make the vacuum holes in a vacuum state and may provide a predetermined adsorption force to the etching object  40  through the vacuum holes maintained in the vacuum state. As a result, the etching object  40  may be fixed to the fixing member  20 . In addition, the fixing member  20  may be the support member including the clamp. The etching object  40  may be fixed with the clamp and an etching process may be performed. However, the etching device  1  according to the present invention is not limited thereto, and the etching device  1  may fix the etching object  40  using an electrostatic chuck or a clamp. 
       FIG. 13  is a cross-sectional view illustrating an example of a cleaning unit included in an etching device. 
     Referring to  FIG. 13 , the cleaning unit  50  included in the etching device  1  may clean the etching solution  1600  remaining in the etching object  40  after the etching object  40  is etched. Since when the etching solution  1600  remains in the etching object  40 , the non-etching area NEA may be etched by the etching solution  1600 , so it is desirable that the etching solution  1600  may be removed. Therefore, after the nozzle unit  30  is detached from the etching object  40 , the cleaning unit  50  may move toward the etching object  40  and may spray a cleaning solution  51  to the etching object  40 . In an embodiment, the cleaning unit  50 , unlike the nozzle unit  30 , may spray the cleaning solution  51  to the entirety of the etching area EA and the non-etching area NEA of the etching object  40 . 
       FIG. 14  is a cross-sectional view illustrating an example of a drying unit included in an etching device. 
     Referring to  FIG. 14 , the drying unit  60  may remove the cleaning solution  51  remaining on the etching object  40  after the etching object  40  is cleaned. For example, the drying unit  60  may remove the cleaning solution  51  by spraying high-pressure air. 
       FIGS. 15 to 19  are cross-sectional views illustrating an etching method according to an embodiment of the present invention. 
     Among the etching methods of the etching device  1  described with reference to  FIGS. 15 to 19 , matters in common with the etching device  1  described with reference to  FIGS. 1 to 14  have been described above, and thus may be omitted below. 
     Referring to  FIG. 15 , the etching object  40  may be disposed on an auxiliary substrate  2000 . The etching object  40  may include a substrate layer  100 , a thin film transistor layer  200 , a light emitting diode layer  300 , an encapsulation layer  400 , and a protective film  500 . The substrate layer  100  may include a first substrate  110  and a second substrate  120 . The etching object  40  may be disposed on the auxiliary substrate  2000 . Specifically, a lower surface  110   a  of the first substrate  110  may contact the auxiliary substrate  2000 . The auxiliary substrate  2000  may serve to support the etching object  40  during a process before the etching process is performed. The etching object  40  may be detached from the auxiliary substrate  2000  before the etching process is performed. 
     Referring to  FIG. 16 , the etching object  40  may be fixed to the fixing member  20  included in the etching device  1 . In order to perform the etching process, the etching object  40  may be fixed to the fixing member  20 . The fixing member  20  may be a support member including an adsorption member or a clamp. For example, the fixing member  20  may be the adsorption member. The fixing member  20  may be attached to the protective film  500  included in the etching object  40 . Since the lower surface  110   a  of the first substrate  110  corresponding to the lower surface of the etching object  40  is a portion in which the etching area EA exists, the fixing member  20  may be attached to an upper surface of the protective film  500  corresponding to an upper surface of the etching object  40 . 
     However, embodiments according to the present invention are not limited thereto, and in other embodiments, the etching device  1  may further include a stage in which the etching object  40  is disposed. The etching object  40  may be disposed on the stage after detached from the auxiliary substrate  2000 . In this case, the etching object  40  of  FIG. 15  may be disposed on the stage in an inverted form left and right. That is, in order to protect the first substrate  110 , the etching object  40  may be disposed on the stage so that the protective film  500  contacts the stage. In order for the etching device  1  to etch the first substrate  110 , the etching object  40  may be inverted to the left and right again by the fixing member  20 . Accordingly, the first substrate  110  may be disposed under the etching object  40 , and the lower surface  110   a  of the first substrate  110  may be etched. 
     Referring to  FIG. 17 , after the etching object  40  is fixed to the fixing member  20 , the nozzle unit  30  included in the etching device  1  may move toward the etching object  40 . That is, the nozzle unit  30  may move in the third direction DR 3 , which is a direction toward the lower surface of the etching object  40 . The nozzle unit  30  may further include a moving member to move the nozzle unit  30 . The moving member may move in the third direction DR 3  and the fourth direction DR 4 . Accordingly, the nozzle unit  30  may also move in the third direction DR 3  and the fourth direction DR 4 . 
     Referring to  FIGS. 18 and 19 , the nozzle unit  30  may contact the lower surface of the etching object  40 . For example,  FIG. 19  may be an enlarged cross-sectional view of an area B of  FIG. 18 . Specifically, the plurality of nozzles  1000  included in the nozzle unit  30  may contact the lower surface  110   a  of the first substrate  110 . Each of the nozzles  1000  may be disposed in the same position as the etching areas EA. Each of the nozzles  1000  may contact with each of the etching areas EA. 
     Referring further to  FIG. 9 , each of the nozzles  1000  may include an etching solution injection hole  1100 , an etching solution collection hole  1200 , and a sealing part  1300 . The sealing part  1300  may seal the etching area EA from an outside by contacting an edge of the etching area EA. 
     After the sealing part  1300  entirely contacts the etching area EA, the etching solution collection hole  1200  may provide the etching solution  1600  to the etching area EA. The sealing part  1300  may place the etching solution  1600  in a space sealed by the sealing part  1300 . Accordingly, the etching solution  1600  may not leak into the non-etching area NEA, and only the etching areas EA of the first substrate  110  may be etched. The etching solution  1600  remaining after etching the etching area EA may be collected through the etching solution collection hole  1200 . 
     After the nozzle unit  30  etches the etching area EA, the nozzle unit  30  may move in a fourth direction DR 4 . That is, the nozzle unit  30  may move to an original position like in  FIG. 17 . In this case, the sealing part  1300  may be detached from the first substrate  110 . 
     Referring to  FIGS. 13 and 14 , after the etching object  40  is etched, the cleaning unit  50  may remove the etching solution  1600  remaining on the etching object  40 . That is, the cleaning unit  50  may clean the etching object  40  by spraying the cleaning solution to the first substrate  110  of the etching object  40 . In addition, after the etching object  40  is cleaned, the drying unit  60  may remove the cleaning solution  51  remaining on the etching object  40 . That is, the drying unit  60  may dry the cleaning solution  51  by spraying high-pressure air. 
     In a conventional etching method, since an etching device etches an etching object above the etching object, an upper surface of the etching object may be etched. In this case, an etching solution remaining on the etching object may move to a side of the etching object by gravity or external force. As the etching solution moves along upper and side surfaces of the etching object, a non-etching area excluding an etching area and other members excluding a substrate may be damaged. 
     In the etching method according to the present embodiment, the etching device  1  may be disposed under the etching object  40 . Since the etching device  1  is disposed under the etching object  40  to etch the lower surface  110   a  of the etching object  40 , the etching solution  1600  remaining after etching the etching object  40  may fall in the fourth direction DR 4  by the gravity. That is, the etching solution  1600  may not move to the non-etching area NEA excluding the etching area EA. Therefore, even if the etching solution  1600  remains, the non-etching area NEA and the other members  12 ,  200 ,  300 ,  400 , and  500  excluding the first substrate  110  may not be damaged. Accordingly, the etching method may improve an accuracy of the etching of the etching object  40  and the quality of the etching object  40  may be improved. 
     The display device according to the embodiments may be applied to a display device included in a computer, a notebook, a mobile phone, a smartphone, a smart pad, a PMP, a PDA, an MP3 player, or the like. 
     Although the methods and the systems according to the embodiments have been described with reference to the drawings, the illustrated embodiments are examples, and may be modified and changed by a person having ordinary knowledge in the relevant technical field without departing from the technical spirit described in the following claims.