Patent Publication Number: US-2022216412-A1

Title: Mask and manufacturing method therefor

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN2020/138863, filed on Dec. 24, 2020, which claims priority to Chinese Application No. 202010006257.3, filed on Jan. 3, 2020, which are incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies, and in particular, to a mask and a manufacturing method therefor. 
     BACKGROUND 
     An organic light-emitting diode (OLED) has advantages of self-luminescence, low energy consumption, lightness and thinness, high color saturation, etc., and may be manufactured into a flexible display device based on a flexible material, which is widely used in various electronic devices including electronic products such as computers and mobile phones. 
     The OLED is self-luminous due to a self-luminous organic material. The self-luminous organic material is mainly deposited on a substrate by an evaporation method, and a mask is required to form different luminous material patterns. 
     SUMMARY 
     In an aspect, a mask is provided. The mask includes a frame, at least one mask sheet, and a shielding plate. The frame includes a plurality of borders, and the plurality of borders are connected end to end in sequence to form the frame with a first hollow region. A mask sheet in the at least one mask sheet includes a pattern region and non-pattern regions. The pattern region includes at least one evaporation hole, and the non-pattern regions are configured to be fixed to the frame, so that the pattern region is opposite to the first hollow region. The shielding plate includes a plurality of shielding strips, and the plurality of shielding strips are arranged crosswise to form a plurality of second hollow regions. Orthogonal projections of the second hollow regions on a plane perpendicular to a thickness direction of the frame are located within a range of an orthogonal projection of the first hollow region on the plane. The shielding plate and the at least one mask sheet are sequentially fixed on the frame in the thickness direction of the frame, and an inner edge of an orthogonal projection of the frame on the plane is located within a range of an orthogonal projection of the shielding plate on the plane. 
     In some embodiments, the frame includes a first region and a second region. The first region includes a portion of the frame fixed to the plurality of shielding strips, and the portion of the frame fixed to the plurality of shielding strips is a shielding strip fixing region. The second region includes a portion of the frame fixed to the at least one mask sheet. A thickness of the first region is less than a thickness of the second region, and the second region is closer to an outer edge of the frame than the first region. 
     In some embodiments, a difference between the thickness of the second region and the thickness of the first region is equal to a thickness of the shielding plate. 
     In some embodiments, the plurality of shielding strips include a plurality of border shielding strips that are in one-to-one correspondence with the plurality of borders. For any border shielding strip, an orthogonal projection of the border shielding strip on the frame is located within a region where a border corresponding to the border shielding strip is located. 
     In some embodiments, the plurality of shielding strips include a plurality of border shielding strips that are in one-to-one correspondence with the plurality of borders. For any border shielding strip, an orthogonal projection of the border shielding strip on the plane is partially overlapped with an orthogonal projection of a border corresponding to the order shielding strip on the plane. 
     In some embodiments, the plurality of shielding strips include a plurality of border shielding strips that are in one-to-one correspondence with the plurality of borders. The shielding plate further includes at least one stretching pin located on an outer side of each border shielding strip. 
     In some embodiments, the first region further includes pin accommodating regions configured to accommodate stretching pins. 
     In some embodiments, the first region further includes fitting allowance regions. The fitting allowance regions are located between the shielding strip fixing region and the second region, and between the pin accommodating regions and the second region. 
     In some embodiments, the plurality of borders include two first borders that are opposite to each other and two second borders that are opposite to each other. The first region and the second region are included in the first borders and the second borders. 
     In some embodiments, the plurality of borders include two first borders that are opposite to each other and two second borders that are opposite to each other. The first region and the second region are included in the first borders, and the first region is further included in the second borders. 
     In some embodiments, a length of the pattern region is greater than a length of the first hollow region in a direction of a line connecting the two first borders that are opposite to each other. 
     In some embodiments, the frame further includes first alignment holes that are non-overlapped with the at least one mask sheet and the shielding plate. 
     In some embodiments, the frame further includes a second alignment hole, and the at least one stretching pin further includes a third alignment hole. When the shielding plate is stretched on the frame, the second alignment hole is aligned with the third alignment hole. 
     In some embodiments, the frame and the shielding plate are made of an iron-nickel alloy or stainless steel. The at least one mask sheet is made of an iron-nickel alloy. 
     In some embodiments, the frame and the shielding plate are fixed in a welding manner. The frame and the at least one mask sheet are fixed in the welding manner. 
     In another aspect, a manufacturing method of a mask is provided for manufacturing the mask described above. Furthermore, the frame of the mask further includes a first region and a second region. A thickness of the first region is less than a thickness of the second region, and the second region is closer to an outer edge of the frame than the first region. 
     The manufacturing method includes: stretching the shielding plate and welding the shielding plate to the first region of the frame, the inner edge of the orthogonal projection of the frame on the plane being located within the range of the orthogonal projection of the shielding plate on the plane; and stretching the at least one mask sheet and welding the at least one mask sheet to the second region of the frame, the at least one mask sheet and the shielding plate being located on a same side of the frame. 
     In some embodiments, the plurality of shielding strips include a plurality of border shielding strips, and the shielding plate further includes the at least one stretching pin located on an outer side of each border shielding strip. The first region includes a shielding strip fixing region and pin accommodating regions. Stretching the shielding plate and welding the shielding plate to the first region of the frame, includes: placing the shielding plate on the frame, and fixing and stretching stretching pins of the shielding plate through a stretcher, so that the plurality of border shielding strips are located in the shielding strip fixing region, and the stretching pins are located in the pin accommodating regions; welding the plurality of border shielding strips to the shielding strip fixing region; and welding the stretching pins to the pin accommodating regions. 
     In some embodiments, the plurality of shielding strips include a plurality of border shielding strips, and the shielding plate further includes at least one stretching pin located on an outer side of each border shielding strip. The first region includes a shielding strip fixing region and pin accommodating regions. Stretching the shielding plate and welding the shielding plate to the first region of the frame, includes: placing the shielding plate on the frame, and fixing and stretching stretching pins of the shielding plate through a stretcher, so that the plurality of border shielding strips are located in the shielding strip fixing region, and the stretching pins are located in the pin accommodating regions; welding the plurality of border shielding strips to the shielding strip fixing region; and removing the stretching pins. 
     In some embodiments, the plurality of shielding strips include a plurality of border shielding strips that are in one-to-one correspondence with the plurality of borders. The inner edge of the orthogonal projection of the frame on the plane being located within the range of the orthogonal projection of the shielding plate on the plane, includes: for any border shielding strip, an orthogonal projection of the border shielding strip on the frame being located within a region where a border corresponding to the border shielding strip is located; or, for any border shielding strip, an orthogonal projection of the border shielding strip on the plane is partially overlapped with an orthogonal projection of a border corresponding to the order shielding strip on the plane. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe technical solutions in the present disclosure more clearly, accompanying drawings to be used in some embodiments of the present disclosure will be introduced briefly below. Obviously, the accompanying drawings to be described below are merely accompanying drawings of some embodiments of the present disclosure, and a person of ordinary skill in the art may obtain other drawings according to these drawings. In addition, the accompanying drawings to be described below may be regarded as schematic diagrams, and are not limitations on an actual size of a product, an actual process of a method and an actual timing of a signal to which the embodiments of the present disclosure relate. 
         FIG. 1  is a structural diagram of an OLED display panel, in accordance with some embodiments; 
         FIG. 2  is a schematic diagram showing an evaporation process of a luminous material of an OLED device, in accordance with some embodiments; 
         FIG. 3  is a structural diagram of a mask sheet, in accordance with some embodiments; 
         FIG. 4  is a structural diagram of a shielding plate, in accordance with some embodiments; 
         FIG. 5A  is a structural diagram of a frame of a mask, in accordance with some embodiments; 
         FIG. 5B  is a structural diagram of another frame of a mask, in accordance with some embodiments; 
         FIG. 6A  is a structural diagram of a mask, in accordance with some related embodiments; 
         FIG. 6B  is a structural diagram of another mask, in accordance with some related embodiments; 
         FIG. 7A  is a structural diagram of a mask, in accordance with some embodiments; 
         FIG. 7B  is a sectional view taken along the A-A′ direction in  FIG. 7A ; 
         FIG. 8A  is a diagram showing a positional relationship between a frame and a shielding plate of a mask, in accordance with some embodiments; 
         FIG. 8B  is a sectional view taken along the B-B′ direction in  FIG. 8A ; 
         FIG. 9A  is a diagram showing another positional relationship between a frame and a shielding plate of a mask, in accordance with some embodiments; 
         FIG. 9B  is a sectional view taken along the C-C′ direction in  FIG. 9A ; 
         FIG. 10A  is a schematic diagram showing a method of fixing a frame and a shielding plate of a mask, in accordance with some embodiments; 
         FIG. 10B  is a schematic diagram showing another method of fixing a frame and a shielding plate of a mask, in accordance with some embodiments; 
         FIG. 11  is a structural diagram of another mask, in accordance with some embodiments; and 
         FIG. 12  is a flowchart of a manufacturing process of a mask, in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions in some embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings below. Obviously, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure shall be included in the protection scope of the present disclosure. 
     Unless the context requires otherwise, throughout the description and the claims, the term “comprise” and other forms thereof such as the third-person singular form “comprises” and the present participle form “comprising” are construed as an open and inclusive meaning, i.e., “including, but not limited to”. In the description of the specification, the terms such as “one embodiment”, “some embodiments”, “exemplary embodiments”, “an example”, “specific example” or “some examples” are intended to indicate that specific features, structures, materials or characteristics related to the embodiment(s) or example(s) are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment(s) or example(s). In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any suitable manner. 
     Below, the terms such as “first” and “second” are only used for descriptive purposes, and are not to be construed as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with “first” or “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, a plurality of/the plurality of means two or more unless otherwise specified. 
     In the description of some embodiments of the present disclosure, it will be understood that orientations or positional relationships indicated by the terms such as “center”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” are based on orientations or positional relationships shown in the drawings, which are merely for convenience of describing the present disclosure and simplifying the description, but not to indicate or imply that the indicated apparatus or element must have a specific orientation, or be constructed or operated in a specific orientation, therefore cannot be construed as a limitation of the present disclosure. 
     In the description of some embodiments, the terms “coupled” and “connected” and their derivatives may be used. For example, the term “connected” may be used in the description of some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. For another example, the term “coupled” may be used in the description of some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. However, the term “coupled” or “communicatively coupled” may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein. 
     Some embodiments of the present disclosure provide a mask. The mask may be, for example, used in a manufacturing process of an OLED display panel. 
     A plurality of OLED devices are provided in the OLED display panel. The OLED device may realize self-luminescence, and thus a backlight source is not required to be provided in a display apparatus including the OLED display panel. 
     For example, a schematic structural diagram of the OLED display panel is shown in  FIG. 1 . The OLED device therein includes an anode  200 , a cathode  400 , and a light-emitting functional layer  300  located between the anode  200  and the cathode  400 . The light-emitting functional layer  300  may include an organic light-emitting layer  302 , a hole transport layer  301  located between the organic light-emitting layer  302  and the anode  200 , and an electron transport layer  303  located between the organic light-emitting layer  302  and the cathode  400 . In addition, in some embodiments, a hole injection layer may be provided between the hole transport layer  301  and the anode  200 , and an electron injection layer is provided between the electron transport layer  303  and the cathode  400  as needed. It will be noted that  FIG. 1  exemplarily shows that the hole transport layers  301  in different OLED devices are disconnected, and the electron transport layers  303  in different OLED devices are disconnected, but the embodiments of the present disclosure are not limited thereto. In some embodiments, the hole transport layers  301  in different OLED devices may also be connected as a whole, and the electron transport layers  303  in different OLED devices may also be connected as a whole. 
     When the OLED display panel is displaying, by applying a voltage to the anode  200  and the cathode  400 , electrons in the cathode  400  move to the organic light-emitting layer  302  through the electron transport layer  303  under an action of the voltage, and holes in the anode  200  move to the organic light-emitting layer  302  through the hole transport layer  301  under the action of the voltage. The electrons and the holes combine in the organic light-emitting layer  302  to generate excitons, which excite the organic light-emitting layer  302  to emit light, thereby realizing the self-luminescence. 
     When the organic light-emitting layer  302  has different types of organic molecular materials, light of different colors is emitted. In this case, at least three OLED devices emitting light of three primary colors may be provided in a pixel unit of the OLED display panel. As shown in  FIG. 1 , the three OLED devices may be located in a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B, respectively. In addition, by adjusting the voltage applied to the anode  200  and the cathode  400  of the OLED device at a different position in the display panel, a luminous intensity of the OLED device may be changed, thereby realizing display of a color screen. 
     It can be known from the above that the OLED device plays a vital role in a display process of the OLED display panel. Therefore, the manufacturing quality of the OLED device directly affects the display quality of the OLED display panel. 
     The light-emitting functional layer  300  in the OLED device, such as the organic light-emitting layer  302 , the hole transport layer  301 , and the electron transport layer  303 , is generally manufactured by using an evaporation process. For example, as shown in  FIG. 2 , a material of an evaporation source  01  is evaporated by means of resistance wire heating or electron beam heating, and is deposited on a substrate to be evaporated  02  above the evaporation source  01 . In order to deposit different luminescent materials on corresponding positions of the substrate to be evaporated  02 , for example, in order to respectively deposit a luminescent material that may emit red light, a luminescent material that may emit green light, and a luminescent material that may emit blue light on corresponding sub-pixel positions, the mask  03  is required to be provided between the evaporation source  01  and the substrate to be evaporated  02 . 
     The mask  03  in some embodiments of the present disclosure includes a frame  40 , at least one mask sheet  30 , and a shielding plate  50 . 
     As shown in  FIGS. 5A and 5B , the frame  40  includes a plurality of borders  41 . The plurality of borders  41  are connected end to end in sequence to from the frame  40  with a first hollow region  401 . The frame  40  may be of an integrated structure, or may be formed by splicing and fixing the plurality of borders  41 , which is not limited in the embodiments of the present disclosure. 
     It will be noted that  FIGS. 5A and 5B  exemplarily show that the frame  40  includes four borders  41 . In some embodiments, the frame  40  includes five borders  41 . In this case, the first hollow region  401  formed is in a pentagonal shape. In some embodiments, the first hollow region  401  formed by the plurality of borders  41  may be other regular polygons. The number of the borders  41  of the frame  40  is not limited in the embodiments of the present disclosure, which may be determined according to a specific shape of the substrate to be evaporated. Regardless of the shape of the frame  40 , it is required to ensure that the frame  40  is of a hollow structure (the hollow portion is the first hollow region  401 ), so as to ensure that an evaporation material is able to be evaporated onto the substrate to be evaporated  02  through the mask sheet(s)  30  located in the first hollow region  401 . 
     In some embodiments, the frame  40  is made of a metal material with a high strength and a low thermal expansion coefficient, so that the frame  40  has a high stability when heated, and is not easily deformed. For example, the frame  40  may be made of an iron-nickel alloy or stainless steel. 
     As shown in  FIG. 3 , the mask sheet  30  includes a pattern region  31  and non-pattern regions  32 . At least one evaporation hole  311  is provided on the pattern region  31 , and the evaporation hole  311  corresponds to a position of a pattern to be formed on the substrate to be evaporated  02 . The material of the evaporation source  01  is evaporated and deposited on a position of the substrate to be evaporated  02  where deposition is needed through the evaporation hole  311 . The non-pattern regions  32  are configured to be fixed to the frame  40  to fix the mask sheet  30  on the frame  40 , and the non-pattern region  32  has no evaporation holes  311 . 
     In some embodiments, the mask sheet  30  is made of a material with a low thermal expansion coefficient and a high stability, so that the evaporation hole  311  of the mask sheet  30  may have a high precision, so as to ensure an accuracy of an evaporation pattern. For example, the mask sheet  30  is made of an iron-nickel alloy. 
     As shown in  FIG. 4 , the shielding plate  50  includes a plurality of stretching pins  51  and a plurality of shielding strips  52 , and the plurality of shielding strips  52  are arranged in a criss-cross manner to form a plurality of second hollow regions  501 . In  FIG. 4 , the structure inside the rectangular dashed line frame has the shielding strips  52 , and the structure outside the rectangular dashed line frame has the stretching pins  51 . The stretching pins  51  are configured to stretch the shielding plate  50  on the frame  40  by stretching the stretching pins through a stretcher when the shielding plate  50  is stretched. The shielding strips  52  are configured to shield a portion between two adjacent mask sheets  30  and a portion of the substrate to be evaporated  02  where the evaporation material is not required to be deposited. In this case, the evaporation hole  311  in the pattern region  31  of the mask sheet  30  that is not shielded by the shielding plate  50  is an effective evaporation hole. 
     In some embodiments, the substrate to be evaporated  02  is a mother substrate, and several tens or hundreds of small substrates may be obtained by cutting the mother substrate. These small substrates may be used to manufacture various display devices such as computer monitors, televisions, tablet computers, game consoles, mobile phones and PDAs. In this case, the portion of the substrate to be evaporated  02  where the evaporation material is not required to be deposited includes, for example, a spacing region between two adjacent small substrates, and a peripheral region of the entire substrate to be evaporated  02 . 
     In some embodiments, the shielding plate  50  is made of an iron-nickel alloy or stainless steel, and has a high strength and a low thermal expansion coefficient, so as to avoid high-temperature deformation. 
     The following description is made in an example where the frame  40  includes four borders. As shown in  FIGS. 7A and 7B , the plurality of borders  41  includes two first borders  411  arranged opposite to each other and two second borders  412  arranged opposite to each other. The mask sheet  30  is fixed on the frame  40 , and the mask sheet  30  spans the first hollow region  401  of the frame  40 . The non-pattern regions  32  of the mask sheet  30  are fixed to the first borders  411  of the frame  40 , and the pattern region  31  of the mask sheet  30  corresponds to the first hollow region  401 . In some embodiments, the mask sheet  30  is welded to the first borders  411 . 
     The shielding plate  50  is provided on a side of the mask sheet  30  proximate to the frame  40 , and the shielding plate  50  is fixed on the frame  40 . That is, the shielding plate  50  and the mask sheet  30  are sequentially fixed on the frame  40  in a thickness direction of the frame  40 . Orthogonal projections of the plurality of second hollow regions  501  on a plane perpendicular to the thickness direction of the frame  40  are located within a range of an orthogonal projection of the first hollow region  401  on the plane. 
     In some related embodiments, as shown in  FIG. 6A , there are gaps  405  between an inner edge of the frame  40  and an outer edge of the shielding plate  50 . During the evaporation process, the evaporation material passes through the gaps  405 , and is deposited on the substrate to be evaporated  02 , which results in an unnecessary deposition and an influence on a yield of a product. The inner edge of the frame  40  refers to an edge of a side of the borders  41  proximate to outermost shielding strips of the shielding plate  50 . The outer edge of the shielding plate  50  refers to an edge of a side of the outermost shielding strips of the shielding plate  50  proximate to the frame  40 . 
     For this reason, in some related embodiments, as shown in  FIG. 6B , the gaps  405  are shielded by enlarging the non-pattern regions  32  of the mask sheet  30  and adding alignment shielding sheets (also called alignment masks)  60 . In this way, on one hand, a size of the pattern region  31  of the mask sheet  30  is limited, and on another hand, additional shielding sheets are required to be added, which causes waste of cost. 
     In the mask  03  provided by some embodiments of the present disclosure, as shown in  FIG. 7B , the inner edge of an orthogonal projection of the frame  40  on the plane is located within a range of an orthogonal projection of the shielding plate  50  on the plane. Here, the orthogonal projection of the shielding plate  50  includes orthogonal projections of the shielding strips  52 , but does not include orthogonal projections of the stretching pins  51 . 
     In this way, there is no gap between the inner edge of the frame  40  and the outer edge of the shielding plate  50 . During evaporation, the evaporation material can only pass through the evaporation hole  311 , so that a deposition position of the evaporation material on the substrate to be evaporated  02  is accurate, thereby avoiding the influence on the yield of the product caused by the evaporation material diffusing to the substrate to be evaporated  02  from the gaps described above. 
     As shown in  FIGS. 5A and 7B  (a sectional view taken along the A-A′ direction in  FIG. 7A ), in some embodiments, the frame  40  includes a first region  43  and a second region  45 . The first region  43  includes a portion of the frame  40  fixed to the shielding strips  52 , i.e., a shielding strip fixing region  431 . The second region  45  includes a portion of the frame  40  fixed to the mask sheet(s)  30 . The second region  45  is closer to the outer edge of the frame  40  than the first region  43 . 
     On this basis, in order to enable the shielding plate  50  and the mask sheet(s)  30  to be sequentially fixed on the frame  40 , as shown in  FIG. 7B , a thickness h of the first region  43  is less than a thickness H of the second region  45 . The shielding strip fixing region  431  is a portion of the first region  43 , and a thickness of the shielding strip fixing region  431  is the thickness h of the first region. 
     In some embodiments, after the shielding plate  50  and the mask sheet(s)  30  are fixed on the frame  40 , there is no gap between the shielding plate  50  and the mask sheet(s)  30  in the thickness direction of the frame  40 . A difference between the thickness H of the second region  45  and the thickness h of the first region  43  is equal to a thickness of the shielding plate  50  (or the shielding strip  52 ). In this way, an influence on an accuracy of the deposition position of the evaporation material on the substrate to be evaporated  02  may be avoided, which is caused by the evaporation material diffusing from the gaps between the shielding plate  50  and the mask sheet(s)  30  during evaporation. 
     It will be noted that the difference between the thickness H of the second region  45  and the thickness h of the first region  43  may not be completely equal to the thickness of the shielding plate  50  due to an influence of a processing accuracy. In order to avoid an influence of the gaps between the shielding plate  50  and the mask sheet(s)  30  in the thickness direction of the frame  40  on the deposition position of the evaporation material on the substrate to be evaporated  02 , the difference in thickness between the second region  45  and the first region  43  is required to be as close as possible to the thickness of the shielding plate  50 . 
     For example, in some embodiments, a thickness reduction process is performed on a side surface of a frame body with a thickness H in a thickness direction of the frame body to form the first region  43 , and a remaining region not subjected to the thickness reduction process is the second region  45 . Or, in some embodiments, a plurality of protrusions are provided on (e.g., adhered to) a side surface of a frame body with a thickness h in a thickness direction of the frame body. All the protrusions jointly form the second region  45 , and a remaining region without the protrusions is the first region  43 . 
     In addition, before fixing the shielding plate  50  on the frame  40 , it is required to stretch the shielding plate  50  on the frame. On this basis, for the convenience of stretching the shielding plate  50  on the frame  40 , as shown in  FIG. 5A , the first region  43  further includes pin accommodating regions  432  configured to accommodate the stretching pins  51  of the shielding plate  50  in addition to the shielding strip fixing region  431 . 
     In addition, in order to facilitate the assembly of the shielding plate  50  and avoid the inability of the shielding plate  50  to be stretched and fixed on the frame  40  due to processing errors, in some embodiments, as shown in  FIG. 5A , the first region  43  further includes fitting allowance regions  433 . The fitting allowance regions  433  are configured to assemble the shielding plate  50 . The fitting allowance regions  433  are located between the shielding strip fixing region  431  and the second region  45 , and between the pin accommodating regions  432  and the second region  45 . 
     On this basis, in some embodiments, as shown in  FIG. 5A , the first region  43  and the second region  45  are included in the first borders  411  and the second borders  412 . The first region  43  includes the shielding strip fixing region  431 , the pin accommodating regions  432 , and the fitting allowance regions  433 . Or, in some other embodiments, as shown in  FIG. 5B , the first region  43  and the second region  45  are included in the first borders  411 . The first region  43  is further included in the second borders. In this way, it is possible to facilitate the processing and the manufacturing of the frame  40 . 
     In some embodiments, the frame  40  further includes first alignment holes, and the first alignment holes are non-overlapped with the mask sheet  30  and the shielding plate  50 . The first alignment holes are configured to align the mask sheet  30  when the mask sheet  30  is stretched on the frame  40 , so as to ensure a stretching accuracy. The first alignment holes may be located at, for example, four corners of the frame  40 , and symmetrically distributed. 
     For example, as shown in  FIG. 5A , the first alignment hole  402  is an opening in the border  41 . Or, in some embodiments, a small alignment block may be drilled and welded to the frame  40  to form the first alignment hole  402 . The small alignment block with an opening may be formed separately, or may be formed by using a portion of an existing alignment shielding sheet  60  that retains an alignment hole (a remaining portion of the alignment shielding sheet  60  other than the alignment hole may be removed). 
     When the mask sheet  30  is stretched on the frame  40 , in an example where the four corners of the frame  40  are each provided with the first alignment hole  402 , an intersection point of lines of the first alignment holes  402  at diagonal corners is taken as an origin of a coordinate system, and a distance between the mask sheet  30  and the intersection point is controlled by the stretcher to realize the alignment of the mask sheet  30  and the frame  40 . 
     In addition, a third alignment hole  502  is provided in the stretching pin  51  of the shielding plate  50 . A second alignment hole  403  is provided at a position of the pin accommodating region  432  of the frame  40  corresponding to the third alignment hole  502 . When the shielding plate  50  is stretched on the frame  40 , the third alignment hole  502  in the stretching pin is aligned with the second alignment hole  403  in the pin accommodating region  432 . 
     In some embodiments, as shown in  FIG. 8A , the plurality of shielding strips  52  of the shielding plate  50  include a plurality of border shielding strips  521  that are in one-to-one correspondence with the borders  41 . 
     On this basis, as shown in  FIGS. 8A and 8B  (a sectional view taken along the B-B′ direction in  FIG. 8A ), in some embodiments, an orthogonal projection of the border shielding strip  521  on the border  41  is located within a region where the border  41  corresponding to the border shielding strip  521  is located. That is, the border shielding strip  521  is entirely located on the border  41 . In this way, an area of the second hollow region  501  is increased, so that an area of an effective evaporation region may be increased. When a product design is performed, a screen may be extended toward an edge of a substrate, which improves a utilization rate of the substrate. 
     Or, in some other embodiments, as shown in  FIGS. 9A and 9B  (a sectional view taken along the C-C′ direction in  FIG. 9A ), for any border shielding strip  521 , the orthogonal projection of the border shielding strip  521  on the plane is partially overlapped with an orthogonal projection of the border  41  corresponding to the border shielding strip  521  on the plane. That is, a portion of the border shielding strip  521  is located on the border  41 , and a portion extends to the first hollow region  401 . In this way, it is possible to avoid an influence of the edge of the border  41  on an evaporation accuracy. 
     On this basis, in some embodiments, as shown in  FIG. 10A , the shielding plate  50  is fixed on the frame  40  only by the border shielding strips  521 . In this case, after the shielding plate  50  is fixed, the stretching pins  51  of the shielding plate  50  may be cut off. Thus, an influence on the mask sheet(s) caused by thermal deformation of the stretching pins  51  during the evaporation process is avoided. 
     Or, in some other embodiments, as shown in  FIG. 10B , the stretching pin  51  is also fixed on the frame  40 . In this way, there may be more positions for fixing, which is beneficial to improve a fixing strength between the stretching pin  51  and the frame  40 , and make the fixing more stable. 
     The fixing mode described above may be a welding fixing. Welding points  53  (circles in the figure) are schematically shown in  FIGS. 10A and 10B . 
     It can be seen from the above that, in the mask  03  provided by some embodiments of the present disclosure, there is an overlapping region between the border shielding strip  521  and the border  41 , so that there is no gap between the border  41  and the shielding plate  50 . Therefore, it is not required to add an additional alignment shielding sheet  60 , and it is not required to enlarge the non-pattern region  32  of the mask sheet  30  to shield some of the gaps. 
     In this case, as shown in  FIG. 11 , in some embodiments, in a direction (i.e., the up-down direction in  FIG. 11 ) of a line connecting the two opposite first borders  411 , a length of the pattern region  31  of the mask sheet  30  is greater than a length of the first hollow region  401 . In this way, when a product is designed, an arrangement position of a screen on a substrate may be proximate to an edge of the substrate, which improves a utilization rate of the substrate. 
     In addition, some embodiments of the present disclosure provide a manufacturing method of a mask for manufacturing the mask  03 . As shown in  FIG. 12 , the manufacturing method of the mask  03  includes S 101  and S 102 . 
     In S 101 , referring to  FIG. 8A or 9A , the shielding plate  50  is stretched and welded to the first region  43  of the frame  40 , and the inner edge of the orthogonal projection of the frame  40  on the plane is located within the range of the orthogonal projection of the shielding plate  50  on the plane. 
     It can be seen from the above description of the mask  03  that, the frame  40  includes the plurality of borders  41 , and the plurality of borders  41  are connected end to end in sequence to form the frame  40  with the first hollow region  401 . 
     In addition, the frame  40  has the first region  43  and the second region  45 , and the thickness h of the first region  43  is less than the thickness H of the second region  45 . The first region  43  includes the shielding strip fixing region  431  fixed to the shielding plate  50 , the pin accommodating regions  432  for accommodating the stretching pins  51  of the shielding plate  50 , and the fitting allowance regions  433  for assembling the shielding plate  50 . 
     The shielding plate  50  has the plurality of second hollow regions  501 . When the welding is performed, the orthogonal projections of the second hollow regions  501  on the plane perpendicular to the thickness direction of the frame  40  are located within the range of the orthogonal projection of the first hollow region  401  on the plane. In addition, in some embodiments, the shielding strips  52  of the shielding plate  50  include the plurality of border shielding strips  521  and at least one stretching pin  51  located on an outer side of each border shielding strip  521 . 
     In this case, stretching the shielding plate  50  and welding the shielding plate  50  to the first region  43  of the frame  40 , includes: placing the shielding plate  50  on the frame  40 , and fixing and stretching the stretching pins  51  of the shielding plate  50  through a stretcher, so that the border shielding strips  521  are located in the shielding strip fixing region  431 , and the stretching pins  51  are located in the pin accommodating regions  432 ; and welding the border shielding strips  521  to the corresponding borders  41 . 
     In S 102 , referring to  FIG. 5A , the mask sheet  30  is stretched and welded to the second region  45  of the first border  411  of the frame  40 , and the mask sheet  30  and the shielding plate  50  are located on a same side of the frame  40 . 
     The plurality of borders  41  include two first borders  411  that are opposite to each other. The thickness of the first region  43  is less than the thickness of the second region  45 . 
     The above descriptions are merely some specific implementation manners of the present disclosure, but the protection scope of the present disclosure is not limited to thereto. Changes or replacements that any person skilled in the art could conceive of within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.