Patent Publication Number: US-2021187932-A1

Title: Peeling apparatus and method of manufacturing display device using the same

Description:
This application claims priority to Korean Patent Application No. 10-2019-0170564, filed on Dec. 19, 2019, 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 
     Exemplary embodiments of the invention relate to a peeling apparatus and a method of manufacturing a display device using the same. 
     2. Description of the Related Art 
     A display device is a device for displaying an image, and includes a display panel, such as an organic light emitting display panel or a liquid crystal display panel. The display device may include a protective member such as a window for protecting the display panel from an external impact. In particular, the window is widely applied to portable electronic devices, such as smart phones. 
     A base member that is used in the window includes a transparent film or glass. In particular, in a case of glass (or cells), a plurality of glass members may be transferred in a stacked state for ease of transport in a process of manufacturing a display device. Then, for a lamination process, it is desired to separate each of the plurality of glass members in a stacked state. 
     SUMMARY 
     Exemplary embodiments of the invention provide a peeling apparatus capable of automatically separating and discharging a plurality of stacked glass members and films disposed between the glass members. 
     Exemplary embodiments of the invention also provide a method of manufacturing a display device using a peeling apparatus capable of automatically separating and discharging a plurality of stacked glass members and films disposed between the glass members. 
     However, the invention is not restricted to those set forth herein. The above and other exemplary embodiments of the invention will become more apparent to one of ordinary skill in the art to which the invention pertains by referencing the detailed description of the invention given below. 
     An exemplary embodiment of a peeling apparatus includes a water tank, a stage disposed in the water tank, a peeling member disposed above the stage, and a discharge preventing block disposed in the water tank and disposed outside the stage, wherein a height of the discharge preventing block is greater than a height of the stage. 
     An exemplary embodiment of a method of manufacturing a display device includes disposing a target stack including a plurality of stacked glass members on a stage, elevating the stage on which the target stack is disposed, and peeling off a first glass member of the plurality of stacked glass members disposed at an uppermost portion of the target stack using a peeling member, wherein the peeling of the first glass member is performed in a water tank filled with water. 
     The peeling apparatus in an exemplary embodiment may automatically separate and discharge a plurality of stacked glass members and films disposed between the glass members. 
     The method of manufacturing a display device in an exemplary embodiment may automatically separate and discharge a plurality of stacked glass members and films disposed between the glass members, thereby increasing production efficiency. 
     The effects of the invention are not limited to the aforementioned effects, and various other effects are included in the specification. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other advantages and features of the invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: 
         FIG. 1  is a perspective view of an exemplary embodiment of a peeling apparatus; 
         FIG. 2  is a cross-sectional view taken along line II-IP of  FIG. 1 ; 
         FIG. 3  is an enlarged view of region A of  FIG. 2 ; 
         FIG. 4  is a flowchart showing a sequential process of peeling off each stacked member from a target stack; 
         FIG. 5  is a cross-sectional view showing a state in which a target stack is disposed (e.g., mounted) on a stage of a peeling apparatus; 
         FIG. 6  is a side view of a target stack; 
         FIG. 7  is a cross-sectional view showing a glass member of a target stack. 
         FIG. 8  is a cross-sectional view illustrating a state in which a target stack disposed (e.g., mounted) on a stage is aligned; 
         FIG. 9  is an enlarged view of region B of  FIG. 8 ; 
         FIGS. 10A to 11B  are enlarged views of the periphery of the peeling member showing how the first dummy of the target stack is peeled off while  FIG. 10B  is an enlarged view of a portion of  FIG. 10A  and  FIG. 11B  is an enlarged view of a portion of  FIG. 11A ; 
         FIG. 12  is an enlarged view of an area C of  FIG. 8  at the periphery of the discharge preventing weight when the first dummy of the target stack is peeled off; 
         FIGS. 13 and 14  are enlarged views of the periphery of the peeling member showing how the first film is peeled off; 
         FIGS. 15 and 16  are enlarged views of the periphery of the peeling member showing how the first glass member is peeled off; 
         FIG. 17  is a plan view of an exemplary embodiment of a display device including a glass member peeled off using a peeling apparatus; 
         FIG. 18  is a cross-sectional view when the display device of  FIG. 17  is folded; 
         FIG. 19A  is a cross-sectional view showing another exemplary embodiment of the periphery of a peeling member of a peeling apparatus, and  FIG. 19B  is an enlarged view of a portion of  FIG. 19A ; 
         FIG. 20A  is a cross-sectional view showing another exemplary embodiment of the periphery of a peeling member of a peeling apparatus and  FIG. 20B  is an enlarged view of a portion of  FIG. 20A ; 
         FIG. 21  is a cross-sectional view showing another exemplary embodiment of the periphery of a peeling member of a peeling apparatus; 
         FIG. 22  is a cross-sectional view of another exemplary embodiment of a peeling apparatus; 
         FIG. 23  is a cross-sectional view of another exemplary embodiment of a peeling apparatus; and 
         FIG. 24  is a cross-sectional view schematically showing how the stacked member is peeled off from the target stack by the peeling apparatus of  FIG. 23 . 
     
    
    
     DETAILED DESCRIPTION 
     Exemplary embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will filly convey the scope of the invention to those skilled in the art. 
     It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. The same reference numbers indicate the same components throughout the specification. In the attached drawing figures, the thickness of layers and regions is exaggerated for clarity. 
     Although the terms “first”, “second”, etc. may be used herein to describe various elements, these elements, should not be limited by these terms. These terms may be used to distinguish one element from another element. Thus, a first element discussed below may be termed a second element without departing from teachings of one or more embodiments. The description of an element as a “first” element may not require or imply the presence of a second element or other elements. The terms “first”, “second”, etc. may also be used herein to differentiate different categories or sets of elements. For conciseness, the terms “first”, “second”, etc. may represent “first-category (or first-set)”, “second-category (or second-set)”, etc., respectively. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms, including “at least one,” unless the content clearly indicates otherwise. “Or” means “and/or.” As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof. 
     Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element&#39;s relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. In an exemplary embodiment, when the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower,” can therefore, encompasses both an orientation of “lower” and “upper,” depending on the particular orientation of the figure. Similarly, when the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The exemplary terms “below” or “beneath” can, therefore, encompass both an orientation of above and below. 
     “About” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. In an exemplary embodiment, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims. 
     In concluding the detailed description, those skilled in the art will appreciate that many variations and modifications may be made to the preferred embodiments without substantially departing from the principles of the invention. Therefore, the disclosed preferred embodiments of the invention are used in a generic and descriptive sense only and not for purposes of limitation. 
     Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of an exemplary embodiment of a peeling apparatus.  FIG. 2  is a cross-sectional view taken along line II-IP of  FIG. 1 .  FIG. 3  is an enlarged view of region A of  FIG. 2 . 
     Referring to  FIGS. 1 and 3 , a peeling apparatus  10  in an exemplary embodiment may include a water tank  100  in which a peeling process is performed, a stage module  200  which adjusts the position of a target stack  20  (refer to  FIG. 5 ), a peeling module  300  which performs a peeling process of the target stack  20  (refer to  FIG. 5 ), an outer wall  410  and support  420 . 
     A space in which a peeling process is performed may be defined in the water tank  100 . The water tank  100  serves to receive a stage  210 , a discharge preventing block  330 , and the like. To this end, an accommodation space for accommodating the aforementioned members may be defined in the water tank  100 . The water tank  100  may include a bottom surface  110  and a sidewall portion  120  which is bent and extended in an upward direction at each edge along a circumference of the bottom surface  110 . 
     The sidewall portion  120  of the water tank  100  may have a height greater than that of the stage  210  and the discharge preventing block  330 . In other words, the height of the upper end of the sidewall portion  120  may be greater than the height of the upper end of the discharge preventing block  330 , and may be greater than the height of the top surface of the stage  210 , i.e., one surface on which the target stack  20  (refer to  FIG. 5 ) may be disposed (e.g., mounted). That is, the entire area of the stage  210  and the entire area of the discharge preventing block  330  are disposed in the water tank  100 . 
     In addition, although not shown in the drawings, the water tank  100  may be filled with a liquid filler WT during the peeling process. In an exemplary embodiment, the filler WT may be water (H 2 O), ethanol (C 2 H 5 OH), or a surfactant, for example, but is not limited thereto. 
     The stage module  200  may include the stage  210  on which the target stack  20  (refer to  FIG. 5 ) is disposed (e.g., mounted), a height adjusting unit  220  which adjusts the height of the stage  210 , and the target stack  20  (refer to  FIG. 5 ), and a centering unit  230  which aligns the target stack  20  (refer to  FIG. 5 ). 
     The stage  210  may be disposed in the water tank  100  and spaced apart from the bottom surface  110  of the water tank  100  by a predetermined interval. That is, the stage  210  may be disposed in the water tank  100  and disposed above the bottom surface  110  of the water tank  100 . The target stack  20  (refer to  FIG. 5 ) may be disposed (e.g., mounted) on the stage  210 . The height of the stage  210  may be adjusted by the height adjusting unit  220 . 
     Although it is illustrated in the drawing that the stage  210  is horizontal to the ground, the invention is not limited thereto. In an exemplary embodiment, the stage  210  may be inclined at an angle with respect to the ground, and the angle may range from 30 degrees to 60 degrees. In this case, the target stack  20  (refer to  FIG. 5 ) disposed (e.g., mounted) on the stage  210  may also be inclined at the angle with respect to the ground, and the peeling apparatus  10  may further include a separate fixing member for fixing the target stack  20  (refer to  FIG. 5 ) on the stage  210 . 
     The height adjusting unit  220  may include a height adjustment driver  221  and a stage connector  222 . By the height adjusting unit  220 , it is possible to adjust the height of the stage  210  and the target stack  20  (refer to  FIG. 5 ) disposed (e.g., mounted) on the stage  210 . That is, by the height adjusting unit  220 , the stage  210  and the target stack  20  (refer to  FIG. 5 ) disposed (e.g., mounted) on the stage  210  may be moved up and down, and the target stack  20  (refer to  FIG. 5 ) may contact a peeling member  310  of the peeling module  300 . 
     The height adjustment driver  221  may vertically move the stage connector  222  connected to the height adjustment driver  221  and the stage  210  connected to the stage connector  222 . The height adjustment driver  221  may be disposed outside the water tank  100 , and may be, but not limited to, a linear motor or a cylinder. 
     The stage connector  222  may connect the stage  210  to the height adjustment driver  221 . That is, the height of the stage  210  may be adjusted by the vertical movement of the height adjustment driver  221 . 
     The centering unit  230  may be disposed on one side of the stage  210  to move the target stack  20  (refer to  FIG. 5 ) toward the peeling member  310  of the peeling module  300  disposed on the other side of the stage  210  facing the one side. One end of the centering unit  230  may be disposed on the stage  210 , and the other end of the centering unit  230  may be disposed at the stage connector  222 , but the invention is not limited thereto. 
     The peeling module  300  may peel off each stacked member (dummy DM, glass GL and film FL (refer to  FIG. 6 )) on the target stack  20  (refer to  FIG. 5 ). The peeling module  300  may include a peeling member  310 , a peeling member supporter  320 , a discharge preventing block  330 , and a discharge preventing weight  340 . 
     The peeling member  310  may be disposed above the stage  210 . In an exemplary embodiment, the peeling member  310  may be a roller. Although not shown in the drawings, when the target stack  20  (refer to  FIG. 5 ) is disposed (e.g., mounted) on the stage  210 , the target stack  20  (refer to  FIG. 5 ) may be disposed between the stage  210  and the peeling member  310 . The surface of the peeling member  310  may be covered with rubber. The rubber covering the surface of the peeling member  310  may increase a frictional force between the peeling member  310  and the target stack  20  (refer to  FIG. 5 ). As the peeling member  310  rotates, the stacked member disposed at the uppermost portion of the target stack  20  (refer to  FIG. 5 ) may be peeled off. A detailed description thereof will be given later. 
     The peeling member supporter  320  may support the peeling member  310 . Specifically, while the peeling member supporter  320  is disposed above the water tank  100 , and connected to the upper surface of the support  420  outside the water tank  100 , the peeling member supporter  320  may be supported to be positioned above the water tank  100 . In addition, the peeling member supporter  320  may be connected to the peeling member  310  to support the peeling member  310  such that the peeling member  310  is disposed above the stage  210 . 
     Although not shown in the drawings, the peeling member supporter  320  may further include a pressure adjusting spring, a pressure adjusting weight, and a peeling member driving unit. The pressure adjusting spring and the pressure adjusting weight may adjust the height of the peeling member supporter  320 , and thus, the height of the peeling member  310  connected to the peeling member supporter  320  may be adjusted. The driving unit of the peeling member  310  may drive the peeling member  310  to rotate the peeling member  310 . The peeling member driving unit may be automatically driven, or may be manually driven by an operator, although not limited thereto. 
     When the stacked member disposed at the uppermost portion of the target stack  20  (refer to  FIG. 5 ) including a plurality of stacked members is peeled off, the discharge preventing block  330  may serve to prevent the remaining stacked members other than the corresponding stacked member from being peeled off. 
     The discharge preventing block  330  may be disposed inside the water tank  100  and disposed outside the stage  210 . That is, the discharge preventing block  330  may be disposed between the stage  210  and the sidewall portion  120  of the water tank  100 . In addition, the discharge preventing block  330  may be disposed below the peeling member  310 . That is, the discharge preventing block  330  may overlap the peeling member  310  in a thickness direction (third direction DR 3 ), but the invention is not limited thereto. 
     The height of the uppermost end of the discharge preventing block  330  may be greater than the height of the lowermost end of the peeling member  310 . That is, the discharge preventing block  330  is disposed below the peeling member  310  and spaced apart from the peeling member  310  by a predetermined distance, but the uppermost end of the discharge preventing block  330  may be disposed at a higher level by a first thickness W than the lowermost end of the peeling member  310  in the thickness direction (third direction DR 3 ). Although not limited thereto, the first thickness W may range from 0.5 millimeter (mm) to 1.0 mm, for example. 
     In addition, the discharge preventing block  330  may have a height greater than that of the stage  210 . That is, the height of the uppermost end of the discharge preventing block  330  may be greater than the height of the upper surface of the stage  210 , that is, the surface on which the target stack  20  (refer to  FIG. 5 ) may be disposed (e.g., mounted). The thickness of the discharge preventing block  330  in the third direction DR 3  may be greater than the thickness of the stage  210  in the third direction DR 3 , but the invention is not limited thereto. 
     Further, although not limited thereto, the height of the uppermost end of the discharge preventing block  330  and the height of the lowermost end of the peeling member  310  may be lower than the height of the uppermost end of the sidewall portion  120  of the water tank  100 . That is, all parts of the discharge preventing block  330  may be disposed in the water tank  100 , and a lower portion of the peeling member  310  may be disposed in the water tank  100 . 
     The discharge preventing block  330  may include a base portion  331  and a tip portion  332  connected to the base portion  331 . The base portion  331  is not limited thereto, but is connected to the bottom surface  110  of the water tank  100  and may have a uniform thickness (width in a first direction DR 1 ). The thickness of the base portion  331  of the discharge preventing block  330  may be smaller than the length of the base portion  331  extending in the third direction DR 3 . 
     The tip portion  332  is connected to the base portion  331  and may have a thickness (width in the first direction DR 1 ) smaller than the thickness of the base portion  331  (width in the first direction DR 1 ). The thickness of the tip portion  332  may decrease toward the upper end thereof. One surface of the tip portion  332  facing the stage  210  may be referred to as an inner surface of the tip portion  332 , and the other surface, which is an opposite surface of the inner surface of the tip portion  332 , may be referred to as an outer surface of the tip portion  332 . The inner surface of the tip portion  332  may have a rounded shape, but is not limited thereto. 
     One surface of the base portion  331  facing the stage  210  may be referred to as an inner surface of the base portion  331 , and the other surface, which is an opposite surface of the inner surface of the base portion  331 , may be referred to as an outer surface of the base portion  331 . In this case, the outer surface of the tip portion  332  and the outer surface of the base portion  331  may be aligned with each other. 
     The discharge preventing weight  340  may be disposed above the stage  210 . Although not shown in the drawings, when the target stack  20  (refer to  FIG. 5 ) is disposed (e.g., mounted) on the stage  210 , the discharge preventing weight  340  may apply pressure, from top to bottom, to the remaining stacked members other than the stacked member (to be peeled off) disposed at the uppermost layer of the target stack  20  (refer to  FIG. 5 ). Accordingly, it is possible to prevent movement with the stacked member to be peeled off, and to prevent peeling with the stacked member. 
     As will be described later, as the peeling module  300  includes not only the peeling member  310  but also the discharge preventing block  330  and the discharge preventing weight  340 , only one stacked member disposed at the uppermost portion of the target stack  20  (refer to  FIG. 5 ) including a plurality of stacked members may be automatically peeled off, thereby improving process efficiency. 
     The outer wall  410  may be disposed outside the water tank  100 . The outer wall  410  may surround the water tank  100  at the outside of the water tank  100 . The inside of the water tank  100  may be filled with the liquid filler WT, and a peeling process may be performed in a state in which the water tank  100  is filled with the liquid filler WT. In this case, the liquid filler WT may flow out of the water tank  100 . The outer wall  410  may trap the liquid filler WT flowing out of the water tank  100  in the outer wall  410 . 
     The support  420  may be disposed below the outer wall  410  and the water tank  100 . The support  420  may serve to support components such as the outer wall  410  and the water tank  100 , and a space in which other components of the peeling apparatus  10  may be disposed may be defined on the support  420 . 
     Hereinafter, there will be described a method of peeling off each stacked member (a plurality of glass members GL, a plurality of films FL and a plurality of dummies DM (refer to  FIG. 6 )) from the target stack  20  (refer to  FIG. 5 ) including a plurality of stacked members. The glass member peeled off from the target stack  20  (refer to  FIG. 5 ) may be used as a protective member (or window) of the display device. 
       FIG. 4  is a flowchart showing a sequential process of peeling off each stacked member from a target stack.  FIG. 5  is a cross-sectional view showing a state in which a target stack is disposed (e.g., mounted) on a stage of a peeling apparatus.  FIG. 6  is a side view of a target stack.  FIG. 7  is a cross-sectional view showing a glass member of a target stack. 
     Referring to  FIGS. 4 to 7 , the target stack  20  including a plurality of stacked members is prepared, and the target stack  20  is disposed (e.g., mounted) on the stage  210  (operation S 01 ). 
     Although not shown, the target stack  20  may be transferred onto the stage  210  by a robot arm or the like from the outside of the peeling apparatus  10 . Further, the target stack  20  may be provided by cutting a portion of a plurality of mother glass substrates, which are stacked, into a desired shape. However, a method of forming the target stack  20  is not limited thereto. 
     A glass member GL may refer to a first glass member GL 1  and a second glass member GL 2 . A film FL may refer to a first film FL 1 , a second film FL 2 , and a third film FL 3 . A dummy DM may refer to a first dummy DM 1  and a second dummy DM 2 . 
     The target stack  20  may include the glass member GL, the film FL, and the dummy DM. That is, the target stack  20  may include the first glass member GL 1 , the second glass member GL 2 , the first film FL 1 , the second film FL 2 , the third film FL 3 , the first dummy DM 1  and the second dummy DM 2 . Although it is illustrated in the drawing that two glass members GL and three films FL are disposed between the first dummy DM 1  and the second dummy DM 2 , the number of glass members GL and the number of films FL are not limited thereto. 
     The target stack  20  may include the first dummy DM 1 , the first film FL 1 , the first glass member GL 1 , the second film FL 2 , the second glass member GL 2 , the third film FL 3  and the second dummy DM 2 . The first dummy DM 1 , the first film FL 1 , the first glass member GL 1 , the second film FL 2 , the second glass member GL 2 , the third film FL 3  and the second dummy DM 2  may be stacked in this order. That is, the first dummy DM 1  is disposed at the uppermost portion of the target stack  20 , and the second dummy DM 2  is disposed at the lowermost portion of the target stack  20 . A plurality of glass members GL and a plurality of films FL may be disposed between the first dummy DM 1  and the second dummy DM 2 . The respective films FL may be disposed between the glass members GL, between the first dummy DM 1  and the first glass member GL 1 , and between the second dummy DM 2  and the second glass member GL 2 . 
     The first glass member GL 1  and the second glass member GL 2  may have substantially the same configuration. Hereinafter, for simplicity of description, the first glass member GL 1  and the second glass member GL 2  will be referred to as the glass member GL, but the description of the glass member GL may be applied to the first glass member GL 1  and the second glass member GL 2 . 
     The glass member GL may have a plate-like sheet shape having a predetermined thickness. As will be described later, the glass member GL may serve as a window of a display device  30  (refer to  FIG. 17 ). The glass member GL may be applied as a window (or protective member) of the display device  30  (refer to  FIG. 17 ), and may have a planar shape generally similar to the planar shape of the display device  30  (refer to  FIG. 17 ). In an exemplary embodiment, when the display device  30  (refer to  FIG. 17 ) has a rectangular shape, the planar shape of the glass member GL may also be rectangular, for example. 
     In an exemplary embodiment, the glass member GL may include ultra thin glass (“UTG”) or thin glass, for example. As the glass member GL includes an ultra thin film or a thin film, the glass member GL may have a flexible property. That is, the glass member GL may be bent, folded, or rolled. In an exemplary embodiment, the thickness of the glass member GL may be in a range of 10 micrometers (μm) to 300 μm, for example. In an exemplary embodiment, the glass member GL having a thickness ranging from 30 μm to 80 μm or a thickness of about 50 μm may be applied, for example. 
     In an exemplary embodiment, the glass member GL may include soda-lime glass, alkali aluminosilicate glass, borosilicate glass, or lithium alumina silicate glass, for example. 
     The glass member GL may include chemically strengthened or thermally strengthened glass to have strong rigidity. Chemical strengthening may be achieved through an ion exchange process in alkaline salts. The ion exchange process may be performed two or more times. 
     The strengthened glass member GL may have a stress profile in a depth direction from the surface. In an exemplary embodiment, the glass member GL may include a compression region CS of the surface and a tensile region CT therein, for example. In the strengthened glass member GL, the stress is generally the largest at the surface and decreases toward the inside thereof. At the boundary between the compression region CS and the tensile region CT, a compression depth DOL, which is a point where stress is balanced, is defined. 
     The glass member GL may be obtained by strengthening after cutting the glass in a mother substrate state into cell units. The glass strengthening process forms the compression region CS near the surface. In an exemplary embodiment, during the ion exchange process, alkali salts and ions of the glass may be exchanged at the surface, and the exchanged ions may diffuse into the glass to form the compression region CS having a predetermined depth DOL, for example. However, when the ion exchange process is performed in a state where the glass member GL is cut into cell units, ion exchange may be performed through a side surface as well as an upper surface and a lower surface of the glass member GL. Therefore, the compression region CS may be provided not only near the upper surface and the lower surface of the glass member GL but also near the side surface of the glass member GL. 
     As the compression region CS is provided near the surface of the glass member GL, the surface of the glass member GL may not be easily scratched. That is, the surface of the glass member GL may have excellent scratch resistance. 
     The first film FL 1  to the third film FL 3  may have substantially the same configuration. For simplicity of description, although the first film FL 1  to the third film FL 3  will be referred to as the film FL, the description of the film FL may also be applied to the first film FL 1  to the third film FL 3 . 
     The film FL may be cured resin. In a process of stacking the plurality of mother substrates described above, the resin may be applied between the mother substrates to bond the mother substrates to each other. Accordingly, when the target stack  20  is transferred, the target stack  20  may be more stably transferred. 
     The first dummy DM 1  and the second dummy DM 2  may have substantially the same configuration as the glass member GL. However, the thickness of the first dummy DM 1  and the second dummy DM 2  may be greater than the thickness of the glass member GL. Since the first dummy DM 1  is disposed at the uppermost portion of the target stack  20  and the second dummy DM 2  is disposed at the lowermost portion of the target stack  20 , the plurality of glass members GL disposed between the first dummy DM 1  and the second dummy DM 2  may be protected from an external impact that may occur in the process of transferring the target stack  20 . 
     The inside of the water tank  100  may be filled with the liquid filler WT. In an exemplary embodiment, the filler WT may be water (H 2 O), for example. In the following description, it is assumed that the filler WT is water (H 2 O), but the invention is not limited thereto. In an exemplary embodiment, the filler WT may be ethanol (C 2 H 5 OH), a surfactant or the like, for example. 
     As the inside of the water tank  100  is filled with water (H 2 O), the stage  210 , the target stack  20  disposed (e.g., mounted) on the stage  210 , the lower portion of the peeling member  310  and the discharge preventing block  330  may be immerged in water (H 2 O) and most of the peeling process may be performed in a state where the stage  210 , the target stack  20  disposed (e.g., mounted) on the stage  210 , the lower portion of the peeling member  310  and the discharge preventing block  330  are immerged in water (H 2 O). 
     The temperature of the water (H 2 O) may a temperature above zero degree Celsius (° C.), ranging from 30° C. to 90° C., or from 70° C. to 90° C., but is not limited thereto. When the temperature of the water (H 2 O) filling the inside of the water tank  100  is as described above, peeling of the target stack  20  may be more easily performed. 
     Specifically, when the target stack  20  is immersed in the water (H 2 O) of the above-mentioned temperature, it may weaken a bonding force with the first glass member GL 1 , the second glass member GL 2 , the first dummy DM 1  or the second dummy DM 2  in contact with the film FL. That is, when the film FL is immersed in the water (H 2 O) of the above-mentioned temperature, the bonding force of the film FL itself may be reduced by physical and/or chemical change. In addition, the water (H 2 O) may penetrate between the film FL and the first glass member GL 1 , the second glass member GL 2 , the first dummy DM 1 , or the second dummy DM 2 . Thus, the film FL may be physically separated from the first glass member GL 1 , the second glass member GL 2 , the first dummy DM 1 , or the second dummy DM 2 . Accordingly, the frictional force between the film FL and the first glass member GL 1 , the second glass member GL 2 , the first dummy DM 1 , or the second dummy DM 2  may be reduced, which makes it possible to more smoothly perform the peeling process to be performed later. 
     Further, although not shown in the drawings, before the target stack  20  is disposed (e.g., mounted) on the stage  210 , an additional process may be performed such that the target stack  20  is immersed in the water (H 2 O) of the above-mentioned temperature for 20 minutes to 30 minutes in a separate space. 
       FIG. 8  is a cross-sectional view illustrating a state in which a target stack disposed (e.g., mounted) on a stage is aligned.  FIG. 9  is an enlarged view of region B of  FIG. 8 . 
     Then, referring to  FIGS. 8 and 9 , the target stack  20  disposed (e.g., mounted) on the stage  210  is aligned (operation S 02 ). 
     Specifically, by moving the centering unit  230  in the first direction DR 1 , the centering unit  230  may push the target stack  20  disposed (e.g., mounted) on the stage  210  in the first direction DR 1  to move the target stack  20  toward the discharge preventing block  330 . In this case, the target stack  20  may be moved in the first direction DR 1  until at least a portion of the target stack  20  contacts with the inner surface of the discharge preventing block  330 . However, the method of moving the target stack  20  in the first direction DR 1  is not limited thereto. 
     Thereafter, the stage  210  is elevated in the thickness direction (third direction DR 3 ), and accordingly, the target stack  20  disposed (e.g., mounted) on the stage  210  may be elevated in the thickness direction (third direction DR 3 ). By elevating the target stack  20 , the target stack  20  may contact the peeling member  310 . The stage  210  and the target stack  20  disposed (e.g., mounted) on the stage  210  may be elevated by the height adjusting unit  220 , but the method of elevating the stage  210  and the target stack  20  disposed (e.g., mounted) on the stage  210  is not limited thereto. 
       FIGS. 10A to 11B  are enlarged views of the periphery of the peeling member showing how the first dummy of the target stack is peeled off while  FIG. 10B  is an enlarged view of a portion of  FIG. 10A  and  FIG. 11B  is an enlarged view of a portion of  FIG. 11A .  FIG. 12  is an enlarged view of an area C of  FIG. 8  at the periphery of the discharge preventing weight when the first dummy of the target stack is peeled off. 
     Referring to  FIGS. 10A to 12 , as the peeling member  310  rotates, the first dummy DM 1  stacked on the uppermost portion of the target stack  20  is peeled off (operation S 03 ). 
     By the elevation of the stage  210 , the first dummy DM 1  disposed at the uppermost portion of the target stack  20  contacts the peeling member  310 . By the rotation of the peeling member  310 , the first dummy DM 1  and some of the remaining stacked members other than the first dummy DM 1  may move in the first direction DR 1 . In this case, although the discharge preventing block  330  is disposed on the movement path of the first dummy DM 1 , the first dummy DM 1  may be peeled off from the target stack  20 , and may be discharged to the outside of the water tank  100  beyond the tip portion  332  of the discharge preventing block  330  and the upper portion of the water tank  100 . The remaining stacked members disposed below the first dummy DM 1  are blocked from moving in the first direction DR 1  by the discharge preventing block  330 , and the remaining stacked members are not peeled off. 
     Specifically, there may be an imaginary extension plane extending from the lower surface of the first dummy DM 1 , i.e., one surface of the first dummy DM 1  facing the first film FL 1 , before the first dummy DM 1  is peeled off from the target stack  20 . The imaginary plane may be horizontal to the ground. At a point where the imaginary extension plane and the inner surface of the tip portion  332  of the discharge preventing block  330  meet each other, an acute angle θ 1  between the imaginary extension plane and the inner surface of the tip portion  332  of the discharge preventing block  330  may range from 1 degree to 30 degrees, or range from 10 degrees to 20 degrees, but is not limited thereto. 
     With respect to the stage  210 , a direction from the stage  210  toward the discharge preventing block  330  is referred to as one side of the first direction DR 1 , and a direction from the stage  210  toward the height adjusting unit  220  is referred to as the other side of the first direction DR 1 . 
     The peeling member  310  may rotate in a clockwise direction in cross-sectional view. By the frictional force between the peeling member  310  and the first dummy DM 1 , the first dummy DM 1  may move toward the discharge preventing block  330  in the first direction DR 1 , i.e., to one side of the first direction DR 1 . In this case, when the acute angle θ 1  between the imaginary plane extending from the lower surface of the first dummy DM 1  and the inner surface of the tip portion  332  of the discharge preventing block  330  is as described above, the first dummy DM 1  may continue to move toward the upper portion of the discharge preventing block  330  along the inner surface of the tip portion  332  of the discharge preventing block  330 . When the peeling member  310  continues to rotate, the first dummy DM 1  may continuously move toward one side of the first direction DR 1 , thereby being peeled off from the target stack  20 . 
     The remaining stacked members of the target stack  20  disposed below the first dummy DM 1  may move slightly to one side of the first direction DR 1  until they contact the inner surface of the tip portion  332  of the discharge preventing block  330  by the shape of the tip portion  332  of the discharge preventing block  330 . Although the remaining stacked members may move slightly to one side of the first direction DR 1 , when the stacked members meet the inner surface of the tip portion  332  of the discharge preventing block  330 , the remaining stacked members may no longer move, and are blocked by the discharge preventing block  330  to prevent movement to one side of the first direction DR 1 . That is, the remaining stacked members other than the first dummy DM 1  remain on the stage  210  without being peeled off from the target stack  20 . 
     In addition, the discharge preventing weight  340  may serve to prevent the remaining stacked members other than the first dummy DM 1  from being peeled off. The discharge preventing weight  340  may be disposed on the remaining stacked members other than the first dummy DM 1  while being disposed on the other side of the target stack  20  in the first direction DR 1 . The discharge preventing weight  340  may have a predetermined weight, and may be disposed on the remaining stacked members other than the first dummy DM 1 , thereby applying a load to the remaining stacked members. In this case, the load is applied downward in the thickness direction. By the load, it is possible to suppress or prevent the remaining stacked members from moving to one side of the first direction DR 1 . That is, while the discharge preventing block  330  blocks the movement of the remaining stacked members, the discharge preventing weight  340  also suppresses the movement of the remaining stacked members. Accordingly, only the first dummy DM 1  disposed at the uppermost portion of the target stack  20  may be peeled off. 
       FIGS. 13 and 14  are enlarged views of the periphery of the peeling member showing how the first film is peeled off. 
     Referring to  FIGS. 13 and 14 , after the first dummy DM 1  is peeled off, by elevating the stage  210  and the target stack  20  which is disposed (e.g., mounted) on the stage  210  and from which the first dummy DM 1  has been peeled off, the first film FL 1  disposed at the uppermost portion of the target stack  20 , from which the first dummy DM 1  has been peeled off, is peeled off (operation S 04 ). 
     By elevating the stage  210  to elevate the target stack  20  from which the first dummy DM 1  has been peeled off, the target stack  20  is moved such that the first film FL 1  disposed at the uppermost portion of the target stack  20  contacts the peeling member  310 . 
     After moving the first film FL 1  to contact the peeling member  310 , the peeling member  310  is driven to rotate the peeling member  310 . By the rotation of the peeling member  310 , the first film FL 1  and some of the remaining stacked members other than the first film FL 1  may move to one side of the first direction DR 1 . In this case, although the discharge preventing block  330  is disposed on the movement path of the first film FL 1 , the first film FL 1  may be peeled off from the target stack  20 , and may be discharged to the outside of the water tank  100  beyond the tip portion  332  of the discharge preventing block  330  and the upper portion of the water tank  100 . The remaining stacked members disposed below the first film FL 1  are blocked from moving in the first direction DR 1  by the discharge preventing block  330  and the discharge preventing weight  340 , and the remaining stacked members are not peeled off. 
     The peeling operation S 04  in which only the first film FL 1  is peeled off from the target stack  20  from which the first dummy DM 1  has been peeled off, and the remaining stacked members other than the first dummy DM 1  and the first film FL 1  are not peeled off may be substantially the same as the peeling operation S 03  of the first dummy DM 1  described with reference to  FIGS. 10A to 12 . However, in the case of  FIGS. 13 and 14 , there is a difference only in that the first film FL 1  rather than the first dummy DM 1  is peeled off and the remaining stacked members other than the first dummy DM 1  and the first film FL 1  are disposed on the stage  210  without being peeled off. Thus, a redundant description will be omitted. 
       FIGS. 15 and 16  are enlarged views of the periphery of the peeling member showing how the first glass member is peeled off from the target stack from which the first dummy and the first film have been peeled off. 
     Referring to  FIGS. 15 and 16 , after the first dummy DM 1  and the first film FL 1  are peeled off, by elevating the stage  210  and the target stack  20  which is disposed (e.g., mounted) on the stage  210  and from which the first dummy DM 1  and the first film FL 1  have been peeled off, the first glass member GL 1  disposed at the uppermost portion of the target stack  20  is peeled off (operation S 05 ). 
     By elevating the stage  210  to elevate the target stack  20  from which the first dummy DM 1  and the first film FL 1  have been peeled off, the target stack  20  is moved such that the first glass member GL 1  disposed at the uppermost portion of the target stack  20  contacts the peeling member  310 . 
     After moving the first glass member GL 1  to contact the peeling member  310 , the peeling member  310  is driven to rotate the peeling member  310 . By the rotation of the peeling member  310 , the first glass member GL 1  and some of the remaining stacked members other than the first dummy DM 1 , the first film FL 1  and the first glass member GL 1  may move to one side of the first direction DR 1 . In this case, although the discharge preventing block  330  is disposed on the movement path of the first glass member GL 1 , the first glass member GL 1  may be peeled off from the target stack  20 , and may be discharged to the outside of the water tank  100  beyond the tip portion  332  of the discharge preventing block  330  and the upper portion of the water tank  100 . The remaining stacked members disposed below the first glass member GL 1  are blocked from moving in the first direction DR 1  by the discharge preventing block  330  and the discharge preventing weight  340 , and the remaining stacked members are not peeled off. 
     The peeling operation S 05  in which only the first glass member GL 1  is peeled off from the target stack  20  from which the first dummy DM 1  and the first film FL 1  have been peeled off, and the remaining stacked members other than the first dummy DM 1 , the first film FL 1  and the first glass member GL 1  are not peeled off may be substantially the same as the peeling operation S 03  of the first dummy DM 1  described with reference to  FIGS. 10A to 12 . However, in the case of  FIGS. 15 and 16 , there is a difference only in that the first glass member GL 1  rather than the first dummy DM 1  is peeled off and the remaining stacked members other than the first dummy DM 1 , the first film FL 1  and the first glass member GL 1  are disposed on the stage  210  without being peeled off. Thus, a redundant description will be omitted. 
     Subsequently, although not shown, by repeating the operation S 04  of peeling the first film FL 1  and the operation S 05  of peeling the first glass member GL 1 , the second film FL 2 , the second glass member GL 2  and the third film FL 3  may be sequentially removed. Although only the first film FL 1  to the third film FL 3  and the first glass member GL 1  to the second glass member GL 2  are illustrated in the drawings, as described above, the number of films FL and the number of glass members GL are not limited thereto. Therefore, the number of repeated operations S 04  of peeling the first film FL 1  the number of repeated operations S 05  of peeling the first glass member GL 1  may also vary according to the number of films FL and the number of glass members GL. 
     Subsequently, after all the films FL and all the glass members GL are peeled off, when the second dummy DM 2  disposed at the lowermost portion of the target stack  20  is removed (operation S 06 ), the whole peeling process is ended. The method of removing the second dummy DM 2  may be performed according to the operation S 04  of peeling the first film FL 1  or the operation S 05  of peeling the first glass member GL 1 . However, without being limited thereto, the operator may directly remove the second dummy DM 2 . 
     As described above, when the stacked members of the target stack  20  are peeled off using the peeling apparatus  10  in an exemplary embodiment, each stacked member may be automatically peeled off from the target stack  20 . In addition, the plurality of stacked members of the target stack  20  may be continuously peeled off without a separate process. Accordingly, since the operator does not perform the peeling process directly, it is possible to ensure the safety of the operator. Also, it is possible to repeatedly perform the operation of peeling each stacked member, thereby improving the efficiency of the peeling process. 
     Hereinafter, a display device including the glass member GL peeled off using the peeling apparatus  10  in an exemplary embodiment will be described with reference to  FIGS. 17 and 18 . 
       FIG. 17  is a plan view of an exemplary embodiment of a display device including a glass member peeled off using a peeling apparatus.  FIG. 18  is a cross-sectional view when the display device of  FIG. 17  is folded. In  FIG. 18 , a protective member PRT illustratively includes the first glass member GL 1  of  FIG. 7 . 
     Referring to  FIGS. 17 and 18 , a display device  30  displays a screen or an image through a display area DPA, and various devices including the display area DPA may be included therein. Examples of the display device  30  may include, but are not limited to, a smartphone, a mobile phone, a tablet personal computer (“PC”), a personal digital assistant (“PDA”), a portable multimedia player (“PMP”), a television, a game machine, a wristwatch-type electronic device, a head-mounted display, a monitor of a personal computer, a laptop computer, a car navigation system, a car&#39;s dashboard, a digital camera, a camcorder, an external billboard, an electronic billboard, various medical devices, various inspection devices, various household appliances such as a refrigerator and a washing machine including the display area DPA, an Internet-of-Things device (“IoT”), and the like. 
     The display device  30  includes the display area DPA and a non-display area NDA. The display area DPA is an area where a screen is displayed, and the non-display area NDA is an area where a screen is not displayed. 
     In the display area DPA, a plurality of pixels PX may be disposed. The pixel PX is a basic unit for displaying a screen. The pixels PX may include, but not limited to, a red pixel, a green pixel, and a blue pixel. The plurality of pixels PX may be alternately arranged in a plan view. In an exemplary embodiment, the pixels PX may be arranged in a matrix, for example, but the invention is not limited thereto. 
     The non-display area NDA may be disposed around the display area DPA. The non-display area NDA may be disposed around the display area DPA and may surround the display area DPA. In an exemplary embodiment, the display area DPA may be provided in a rectangular shape, and the non-display area NDA may be disposed around four sides of the display area DPA, but the invention is not limited thereto. 
     The display device  30  may include a folding area FDA, a first unfolded area NFA 1 , and a second unfolded area NFA 2 . The folding area FDA may be a region that is actually bent and folded to cross the center of the display device  30 . The first unfolded area NFA 1  and the second unfolded area NFA 2  may be divided by the folding area FDA. A case where the widths of the first unfolded area NFA 1  and the second unfolded area NFA 2  are different from each other have been illustrated in the drawing, but the first unfolded area NFA 1  and the second unfolded area NFA 2  may have the same width. 
     Each of the folding area FDA, the first unfolded area NFA 1  and the second unfolded area NFA 2  may partially overlap the display area DPA and the non-display area NDA. 
     The folding may be performed by an in-folding method in which a display surface is folded inward and/or an out-folding method in which the display surface is folded outward.  FIG. 18  shows an example in which folding is performed in an out-folding manner. As the display device  30  is folded, a display panel ATL and the protective member PRT are folded and bent together in the folding area FDA. The protective member PRT in the folding area FDA may be folded and unfolded repeatedly. 
     The display device  30  may include the display panel ATL and the protective member PRT disposed on the display panel ATL. 
     Examples of the display panel ATL may include not only a self-luminous display panel such as an organic light emitting diode (“OLED”) display panel, an inorganic electroluminescence (“EL”) display panel, a quantum dot (“QED”) display panel, a micro-LED display panel, a nano-LED display panel, a plasma display panel (“PDP”), a field emission display (“FED”) panel and a cathode ray tube (“CRT”) display panel, but also a light receiving display panel such as a liquid crystal display (“LCD”) panel and an electrophoretic display (“EPD”) panel. 
     The protective member PRT may include a film layer FIL and a glass member GL 1 . The film layer FIL may perform a scattering prevention function. In an exemplary embodiment, even when the glass member GL 1  is broken, since fragments are attached to the film layer FIL, scattering of the fragments may be prevented, for example. The film layer FIL may perform other functions such as impact resistance instead of or in addition to the scattering prevention function. 
     The glass member GL 1  may be disposed on the film layer FIL. Since the glass member GL 1  has been described in detail above, a redundant description thereof will be omitted. 
     A first bonding layer PSA 1  may be disposed between the film layer FIL and the glass member GL 1 . The first bonding layer PSA 1  may be interposed between the glass member GL 1  and the film layer FIL to bond them. The first bonding layer PSA 1  is preferably a tackifier layer, but may also be an adhesive layer. 
     A second bonding layer PSA 2  may be disposed between the film layer FIL and the display panel ATL. The second bonding layer PSA 2  may be a transparent layer such as an optically clear adhesive (“OCA”) or an optically clear resin (“OCR”). The protective member PRT may be attached onto the display panel ATL by the second bonding layer PSA 2 . 
     The protective member PRT may further include a print layer PL disposed in the edge area. The print layer PL is disposed in the non-display area NDA. The print layer PL may be an edge coating layer. The print layer PL may be a decorative layer and/or an outermost black matrix layer that imparts an aesthetic appeal. 
     Hereinafter, other exemplary embodiments of the peeling apparatus  10  will be described. In the following embodiments, a description of the same components as those of the above-described embodiment will be omitted or simplified, and differences will be mainly described. 
       FIG. 19A  is a cross-sectional view showing another exemplary embodiment of the periphery of a peeling member of a peeling apparatus and  FIG. 19B  is an enlarged view of a portion of  FIG. 19A . 
     Referring to  FIGS. 19A and 19B , a tip portion  332 _ 1  of a discharge preventing block  330 _ 1  included in a peeling apparatus  10 _ 1  according to the illustrated exemplary embodiment is different from the exemplary embodiment of  FIG. 2  in that the inner surface is not rounded. 
     Specifically, the peeling apparatus  10 _ 1  according to the illustrated exemplary embodiment may include a discharge preventing block  330 _ 1 , and the discharge preventing block  330 _ 1  may include a base portion  331  and a tip portion  332 _ 1 . However, the inner surface of the tip portion  332 _ 1  of the discharge preventing block  330 _ 1  is not rounded, and the inner surface of the tip portion  332 _ 1  is connected in a straight line from an upper portion of the tip portion  332 _ 1  toward a lower portion of the tip portion  332 _ 1 . That is, the inner surface of the tip portion  332 _ 1  of the discharge preventing block  330 _ 1  may be inclined with respect to the first direction DR 1  and the third direction DR 3 . In addition, at a point where the inner surface of the tip portion  332 _ 1  and the imaginary plane extending from the lower surface of the first dummy DM 1  meet each other, an acute angle θ 2  between the inner surface and the imaginary plane may range from 1 degree to 30 degrees, or range from 10 degrees to 20 degrees. 
     Also in this case, as the peeling member  310  rotates, the stacked members of the target stack  20  may be automatically peeled off one by one, thereby ensuring the safety of the operator and improving the efficiency of the peeling process. 
       FIG. 20A  is a cross-sectional view showing another exemplary embodiment of the periphery of a peeling member of a peeling apparatus and  FIG. 20B  is an enlarged view of a portion of  FIG. 20A . 
     Referring to  FIGS. 20A and 20B , a discharge preventing block  330 _ 2  included in a peeling apparatus  10 _ 2  according to the illustrated exemplary embodiment is different from the exemplary embodiment of  FIG. 2  in that it does not include the base portion  331  and the tip portion  332 , and is provided in a cylindrical shape. 
     Specifically, the peeling apparatus  10  according to the illustrated exemplary embodiment includes the discharge preventing block  330 _ 2 , and the discharge preventing block  330 _ 2  does not include the base portion  331  and the tip portion  332 , and may have a cylindrical shape or a roller shape extending in the second direction DR 2 . Thus, the discharge preventing block  330 _ 2  according to the illustrated exemplary embodiment may have a circular shape in the cross-sectional view of  FIG. 20A . 
     At a point where the surface of the discharge preventing block  330 _ 2  and the imaginary plane extending from the lower surface of the first dummy DM 1  meet each other, an acute angle θ 3  between the above-mentioned surface and the imaginary plane may range from 1 degree to 30 degrees, or range from 10 degrees to 20 degrees. 
     Also in this case, as the peeling member  310  rotates, the stacked members of the target stack  20  may be automatically peeled off one by one, thereby ensuring the safety of the operator and improving the efficiency of the peeling process. 
       FIG. 21  is a cross-sectional view showing another exemplary embodiment of the periphery of a peeling member of a peeling apparatus. 
     Referring to  FIG. 21 , a peeling member  310 _ 3  included in a peeling apparatus  10 _ 3  according to the illustrated exemplary embodiment is different from the exemplary embodiment of  FIG. 2  in that a friction member  311 _ 3  is attached to at least a portion of the surface of the peeling member  310 _ 3 . 
     Specifically, the peeling apparatus  10 _ 3  according to the illustrated exemplary embodiment includes the peeling member  310 _ 3 , and the surface of the peeling member  310 _ 3  includes rubber, but the friction member  311 _ 3  may be attached to at least a portion of the surface of the peeling member  310 _ 3 . In this case, the friction member  311 _ 3  may be attached to the surface of the peeling member  310 _ 3  and may be in direct contact with each stacked member of the target stack  20 . The friction member  311 _ 3  may increase a frictional force between the peeling member  310 _ 3  and the target stack  20 . As the frictional force between the peeling member  310 _ 3  and each stacked member of the target stack  20  increases, the peeling process by the rotation of the peeling member  310 _ 3  may be performed more smoothly. 
     Also in this case, as the peeling member  310 _ 3  rotates, the stacked members of the target stack  20  may be automatically peeled off one by one, thereby ensuring the safety of the operator and improving the efficiency of the peeling process. 
       FIG. 22  is a cross-sectional view of another exemplary embodiment of a peeling apparatus. 
     Referring to  FIG. 22 , a peeling apparatus  10 _ 4  according to the illustrated exemplary embodiment is different from the exemplary embodiment of  FIG. 2  in that it includes not only the peeling member  310  but also a sub-peeling member  310 S. 
     Specifically, the peeling apparatus  10  according to the illustrated exemplary embodiment includes the peeling module  300 , but the peeling module  300  may include a plurality of peeling members  310 . That is, the peeling apparatus  10  according to the illustrated exemplary embodiment may include the peeling member  310  and the sub-peeling member  310 S. The shape of the sub-peeling member  310 S may be substantially the same as the shape of the peeling member  310 . 
     The sub-peeling member  310 S may be disposed on the stage  210  and may be disposed between the peeling member  310  and the centering unit  230 . In addition, the sub-peeling member  310 S may have the same height as the peeling member  310 . That is, the height from the top surface of the stage  210  to the peeling member  310  may be the same as the height from the top surface of the stage  210  to the sub-peeling member  310 S. In this case, as the target stack  20  disposed (e.g., mounted) on the stage  210  elevates, the stacked member disposed at the uppermost portion of the target stack  20  contacts the peeling member  310  and the sub-peeling member  310 S. When a process of peeling the stacked member disposed at the uppermost portion of the target stack  20  is performed, the peeling process may be performed more smoothly by further including the sub-peeling member  310 S. 
     Also in this case, as the peeling member  310  rotates, the stacked members of the target stack  20  may be automatically peeled off one by one, thereby ensuring the safety of the operator and improving the efficiency of the peeling process. In addition, as the peeling apparatus  10  further includes not only the peeling member  310  but also the sub-peeling member  310 S, even when the peeling member  310  is damaged, the peeling process may be performed only by the sub-peeling member  310 S. Therefore, the peeling process may be performed continuously and smoothly. 
       FIG. 23  is a cross-sectional view of another exemplary embodiment of a peeling apparatus.  FIG. 24  is a cross-sectional view schematically showing how the stacked member is peeled off from the target stack by the peeling apparatus of  FIG. 23 . 
     Referring to  FIGS. 23 and 24 , a peeling member  310 _ 5  of a peeling apparatus  10 _ 5  according to the illustrated exemplary embodiment is different from the exemplary embodiment of  FIG. 2  in that the peeling member  310 _ 5  has a plate shape rather than a roller shape. 
     Specifically, the peeling member  310 _ 5  of the peeling apparatus  10 _ 5  according to the illustrated exemplary embodiment is not provided in a roller shape, but may be provided in a plate shape. The peeling member  310 _ 5  may be disposed above the stage  210  and may be connected to the peeling member support  320 . The lower surface of the peeling member  310 _ 5 , i.e., the surface facing the stage  210  may include rubber. However, the peeling member  310 _ 5  is not limited thereto, and for example, an adsorption member may be disposed below the peeling member  310 _ 5  to adsorb the target stack  20 . 
     The peeling member  310 _ 5  may move up and down (in the third direction DR 3 ). After the target stack  20  is disposed (e.g., mounted) on the stage  210 , the peeling member  310 _ 5  disposed on the stage  210  may move down to contact the target stack  20 . Subsequently, as the peeling member  310 _ 5  moves to one side of the first direction DR 1 , the stacked member disposed at the uppermost portion of the target stack  20  may move together with the peeling member  310 _ 5  to be peeled off from the target stack  20 . 
     Also in this case, as the peeling member  310 _ 5  rotates, the stacked members of the target stack  20  may be automatically peeled off one by one, thereby ensuring the safety of the operator and improving the efficiency of the peeling process. 
     While the exemplary embodiments of the invention have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various modifications may be made without departing from the scope of the invention and without changing essential features. Therefore, the above-described embodiments should be considered in a descriptive sense only and not for purposes of limitation.