Patent Publication Number: US-2021168948-A1

Title: Housing and mobile terminal

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2019/076352, filed on Feb. 27, 2019, which claims priority to Chinese Patent Application No. 201810912090.X, filed on Aug. 10, 2018. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     This application relates to the field of communications technologies, and in particular, to the field of user equipment technologies. 
     BACKGROUND 
     With continuous development of display technologies, a user has a higher requirement on appearance design of a mobile terminal, for example, a mobile phone. To improve user experience, a texture pattern used for decoration is disposed on a housing of the mobile phone. Currently, a texture pattern with a decorative effect may be formed on a transparent substrate by using a printing technology. However, a texture pattern obtained in the foregoing fabrication method is simple. 
     SUMMARY 
     This application provides a housing and a mobile terminal, to resolve, to some extent, a problem that a texture pattern prepared on a housing of the mobile terminal is relatively simple. 
     To achieve the foregoing objective, the following technical solutions are used in this application. 
     According to an aspect of this application, a housing is provided. The housing includes a housing substrate and at least one double-sided composite texture film located on one side of an inner surface of the housing substrate. The double-sided composite texture film includes a first substrate, and the first substrate includes a first surface close to the housing substrate and a second surface away from the housing substrate. The double-sided composite texture film further includes a first texture layer located on the first surface of the first substrate and a second texture layer located on the second surface of the first substrate. The first texture layer has a first texture pattern that includes a plurality of grooves and a plurality of bosses. The second texture layer has a second texture pattern that includes a plurality of grooves and a plurality of bosses. After the first texture pattern and the second texture pattern are superimposed, a new texture pattern may be generated. For example, sizes of the grooves and the bosses in the first texture pattern and the second texture pattern may be of a nanometer scale or a micrometer scale. In this case, according to a Moore fringe interference principle, after the first texture pattern and the second texture pattern are superimposed, an interference fringe is easily generated. The interference fringe may be used as a new texture pattern of the housing. The foregoing new texture pattern is more complex than the single-layer first texture pattern or the single-layer second texture pattern, so that difficulty in copying and imitating the texture pattern is increased, and a product homogenization degree is reduced. 
     In an embodiment, the housing further includes at least one single-sided composite texture film, and the single-sided composite texture film is located on one side of the inner surface of the housing substrate and is disposed with the composite texture film in a stacked manner. The single-sided composite texture film includes a second substrate and a third texture layer located on a surface that is of the second substrate and that is close to or away from the housing substrate. The third texture layer has a third texture pattern that includes a plurality of grooves and a plurality of bosses. In this case, a more complex texture pattern may be obtained after the third texture pattern in the single-sided composite texture film is superimposed on the first texture pattern and the second texture layer in the double-sided composite texture film, so that decorative effects of a housing texture are more diversified. 
     In an embodiment, the inner surface of the housing substrate has a fourth texture pattern, and the fourth texture pattern includes a plurality of grooves and a plurality of bosses. A more complex texture pattern may be obtained after the fourth texture pattern, and the first texture pattern and the second texture layer in the double-sided composite texture film are superimposed or after the fourth texture pattern, the first texture pattern and the second texture layer in the double-sided composite texture film, and the third texture pattern in the single-sided composite texture film are superimposed, so that decorative effects of a housing texture are more diversified. In addition, the housing further includes a first bonding layer located on the inner surface of the housing substrate, so that the housing substrate and a multi-layer texture composite film of the housing other than the housing substrate can be bonded and fastened together. In addition, a refractive index of the first bonding layer is different from a refractive index of the housing substrate, so that the fourth texture pattern on the housing substrate can be identified by human eyes. 
     In an embodiment, an outer surface of the housing substrate has a fifth texture pattern, and the fifth texture pattern includes a plurality of grooves and a plurality of bosses. A more complex texture pattern may be obtained after the fifth texture pattern, and the first texture pattern and the second texture layer in the double-sided composite texture film are superimposed, after the fifth texture pattern, the first texture pattern and the second texture layer in the double-sided composite texture film, and the third texture pattern in the single-sided composite texture film are superimposed, or after the fifth texture pattern, the first texture pattern and the second texture layer in the double-sided composite texture film, the third texture pattern in the single-sided composite texture film, and the fourth texture pattern on the inner surface of the housing are superimposed, so that decorative effects of a housing texture are more diversified. 
     Optionally, the housing further includes a second substrate, and the second substrate is located between the housing substrate and the double-sided composite texture film. The second substrate can improve rigidity and reliability of the housing. 
     In an embodiment, the housing further includes an ink layer. The double-sided composite texture film is located between the ink layer and the housing substrate. When the housing further includes a single-sided composite texture film, the single-sided composite texture film may also be located between the ink layer and the housing substrate. The ink layer can provide a color for the housing. 
     In an embodiment, glass substrates can be massively produced. Therefore, the housing substrate is a glass substrate, to reduce product production difficulty. In addition, a material that forms the first substrate or the second substrate includes polyethylene terephthalate, a thermoplastic polyurethane elastomer, or the like. The polyethylene terephthalate or the thermoplastic polyurethane elastomer has a mass production characteristic. 
     In an embodiment, a front cover has a light transmission area and a light shielding area located around the light transmission area. The first texture pattern and the second texture pattern are disposed in the light shielding area. In this way, the front cover may also have a complex decorative texture, to improve appearance quality of a mobile terminal. 
     In an embodiment, the housing substrate is a hardened layer. A material that forms the first substrate or the second substrate includes polyethylene terephthalate, a thermoplastic polyurethane elastomer, or the like. The housing further includes a glossy oil buffer layer, an adhesive layer, and an injection molding layer that are sequentially away from the housing substrate. The glossy oil buffer layer is in contact with the ink layer. In addition, in the housing, the first texture layer closest to the hardened layer is in direct contact with the hardened layer. In this case, the housing may be prepared by using an IMTL process. 
     In an embodiment, the housing substrate is a hardened layer. The first substrate is a composite plate that includes at least a polycarbonate film substrate and a polymethacrylate substrate that are disposed in a stacked manner. In the housing, the first texture layer closest to the hardened layer is in direct contact with the hardened layer. In this case, the housing may be prepared by using a composite plate technology. 
     In an embodiment, the housing further includes an optical coating, and the optical coating is located on a surface that is of the ink layer and that is close to the housing substrate. The optical coating can make a color of the ink layer brighter. 
     In an embodiment, the housing further includes a second bonding layer that is in contact with the first texture layer, the second texture layer, or the third texture layer. A refractive index of the second bonding layer is different from a refractive index of a film layer in contact with the second bonding layer. The second bonding layer is configured to: bond and fasten two adjacent double-sided composite texture films; bond and fasten a double-sided composite texture film and a single-sided composite texture film that are adjacent; or bond and fasten a double-sided composite texture film and another film layer. In this case, the refractive index of the second bonding layer is different from the refractive index of the film layer in contact with the second bonding layer, so that it can be ensured that a texture pattern at the first texture layer, the second texture layer, or the third texture layer is recognized by human eyes. 
     According to another aspect of this application, a housing is provided. The housing includes a housing substrate and at least one single-sided composite texture film located on one side of an inner surface of the housing substrate. The single-sided composite texture film includes a second substrate and a third texture layer located on a surface that is of the second substrate and that is close to or away from the housing substrate. The third texture layer has a third texture pattern that includes a plurality of grooves and a plurality of bosses. 
     In an embodiment, the inner surface of the housing substrate has a fourth texture pattern, and the fourth texture pattern includes a plurality of grooves and a plurality of bosses; and/or an outer surface of the housing substrate has a fifth texture pattern, and the fifth texture pattern includes a plurality of grooves and a plurality of bosses. In this case, a new relatively complex texture pattern, for example, an interference texture pattern, is formed by superimposing texture patterns on the inner surface and/or the outer surface of the housing substrate and a texture pattern at the third texture layer of the at least one single-sided composite texture film, to increase diversity and complexity of a decorative effect of the housing, and to increase decoration duplication difficulty of the housing. 
     In an embodiment, when the inner surface of the housing substrate has the fourth texture pattern, the housing further includes a first bonding layer located on the inner surface of the housing substrate, and a refractive index of the first bonding layer is different from a refractive index of the housing substrate. A technical effect of the first bonding layer is described above. Details are not described herein again. 
     In an embodiment, the housing includes at least two single-sided composite texture films. The housing further includes a second bonding layer located between two adjacent single-sided composite texture films. A refractive index of the second bonding layer is different from a refractive index of the third texture layer in contact with the second bonding layer. At least two single-sided composite texture films are disposed, so that a placement angle of third texture patterns at third texture layers of different single-sided composite texture films may be adjusted, to form a relatively complex texture pattern after the two single-sided composite texture films are superimposed. 
     In an embodiment, the housing substrate is a hardened layer. The housing further includes an injection-molding texture layer, and the injection-molding texture layer is disposed with the single-sided composite texture film in a stacked manner and is in contact with the hardened layer. A surface that is of the injection-molding texture layer and that is in contact with the hardened layer has a sixth texture pattern, and the sixth texture pattern includes a plurality of grooves and a plurality of bosses. After the sixth texture pattern at the injection-molding texture layer and the third texture pattern at the third texture layer of the single-sided composite texture film are superimposed, a relatively complex texture pattern may be formed. 
     In an embodiment, the housing further includes an ink layer, and the single-sided composite texture film is located between the housing substrate and the ink layer. 
     Optionally, the housing further includes an optical coating, and the optical coating is located on a surface that is of the ink layer and that is close to the housing substrate. In addition, a surface that is of the optical coating and that is away from the ink layer may be in contact with a single-sided composite texture film that is farthest away from the housing substrate. Technical effects of the optical coating and the ink layer are described above. Details are not described herein again. 
     In an embodiment, the housing substrate is a glass substrate. A technical effect of the glass substrate is described above. Details are not described herein again. 
     According to another aspect of this application, a housing is provided. The housing includes a housing substrate. An inner surface of the housing substrate has a fourth texture pattern, and the fourth texture pattern includes a plurality of grooves and a plurality of bosses. An outer surface of the housing substrate has a fifth texture pattern, and the fifth texture pattern includes a plurality of grooves and a plurality of bosses. The housing further includes an ink layer located on one side of the inner surface of the housing substrate. A new relatively complex texture pattern is formed by superimposing texture patterns of the inner surface and the outer surface of the housing substrate, to increase diversity and complexity of a decorative effect of the housing. 
     In an embodiment, the housing further includes an optical coating, a surface on one side of the optical coating is in contact with the inner surface of the housing substrate, and a surface on the other side of the optical coating is in contact with the ink layer. 
     In an embodiment, the housing substrate is a glass substrate. A technical effect of the glass substrate is described above. Details are not described herein again. 
     According to another aspect of this application, a mobile terminal is provided, and includes a display and a middle frame. The display is installed in the middle frame. In addition, the mobile terminal further includes any one of the foregoing housings. The housing is a front cover, and the front cover is disposed on an out-light surface of the display. The front cover has a light transmission area and a light shielding area located around the light transmission area. The light transmission area of the front cover can transmit display light emitted by the display, and the light shielding area of the front cover can shield an area that is of the display and in which a drive circuit is disposed. Alternatively, the housing is a back cover, and the back cover is disposed on one side that is of the middle frame and that is away from the out-light surface of the display, to protect internal components such as a mainboard and a battery that are installed on the middle frame. The mobile terminal has a technical effect the same as that of the housing provided in the foregoing embodiments. Details are not described herein again. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic structural diagram of a mobile terminal according to some embodiments of this application; 
         FIG. 2  is a schematic structural diagram  1  of a housing according to some embodiments of this application; 
         FIG. 3  is a schematic structural diagram of a double-sided composite texture film in  FIG. 2 ; 
         FIG. 4 a    is a schematic diagram of a first texture pattern according to some embodiments of this application; 
         FIG. 4 b    is a schematic diagram of a second texture pattern according to some embodiments of this application; 
         FIG. 4 c    is a schematic diagram of a new texture pattern formed after the texture patterns shown in  FIG. 4 a    and  FIG. 4 b    are superimposed; 
         FIG. 5 a   ,  FIG. 5 b   ,  FIG. 5 c   ,  FIG. 5 d   , and  FIG. 5 e    are schematic diagrams of a process of fabricating a multi-layer texture composite film in  FIG. 3  other than a housing substrate; 
         FIG. 6  is a schematic structural diagram of a multi-layer texture composite film according to some embodiments of this application; 
         FIG. 7  is a top view of the multi-layer texture composite film shown in  FIG. 6 ; 
         FIG. 8  is a schematic structural diagram  2  of a housing according to some embodiments of this application; 
         FIG. 9  is a schematic structural diagram  3  of a housing according to some embodiments of this application; 
         FIG. 10  is a schematic structural diagram  4  of a housing according to some embodiments of this application; 
         FIG. 11  is a schematic structural diagram  5  of a housing according to some embodiments of this application; 
         FIG. 12  is a schematic structural diagram  6  of a housing according to some embodiments of this application; 
         FIG. 13  is a schematic structural diagram  7  of a housing according to some embodiments of this application; 
         FIG. 14  is a schematic structural diagram  8  of a housing according to some embodiments of this application; 
         FIG. 15  is a schematic structural diagram  9  of a housing according to some embodiments of this application; 
         FIG. 16  is a schematic structural diagram  10  of a housing according to some embodiments of this application; 
         FIG. 17  is a schematic structural diagram  11  of a housing according to some embodiments of this application; 
         FIG. 18  is a schematic structural diagram  12  of a housing according to some embodiments of this application; 
         FIG. 19 a    is a schematic structural diagram  13  of a housing according to some embodiments of this application; 
         FIG. 19 b    is a schematic structural diagram  14  of a housing according to some embodiments of this application; 
         FIG. 20  is a schematic structural diagram of a mobile terminal according to some embodiments of this application; 
         FIG. 21  is a schematic structural diagram  15  of a housing according to some embodiments of this application; and 
         FIG. 22  is a schematic structural diagram  16  of a housing according to some embodiments of this application. 
     
    
    
     REFERENCE SIGNS 
       01 —Housing;  100 —Front cover;  11 —Middle frame;  120 —Back cover;  13 —Display;  14 —Multi-layer texture composite film;  15 —Groove;  16 —Boss;  17 —Main board;  18 —Battery;  20 —UV adhesive;  21 —Mold;  22 —Protective film;  23 —Release film;  31 —First bonding layer;  32 —Second bonding layer;  33 —Third bonding layer;  100 —Housing substrate;  101 —Light transmission area of a front cover;  102 —Light shielding area of a front cover;  200 —Double-sided composite texture film;  201 —First substrate;  202 —First texture layer;  212 —Second texture layer;  300 —Optical coating;  301 —Ink layer;  302 —Glossy oil buffer layer;  303 —Adhesive layer;  304 —Injection molding layer;  400 —Single-sided composite texture film;  401 —Second substrate;  402 —Third texture layer; and  500 —Injection-molding texture layer. 
     DESCRIPTION OF EMBODIMENTS 
     The following describes the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Definitely, the described embodiments are merely some rather than all of the embodiments of this application. 
     The following terms “first” and “second” are merely intended for description, and shall not be understood as an indication or implication of relative importance or implicit indication of a quantity of indicated technical features. Therefore, a feature limited by “first” or “second” may explicitly or implicitly include one or more features. 
     In addition, in this application, orientation terms such as “upper”, “lower”, “left”, and “right” are defined relative to orientations of the components in the accompanying drawings. It should be understood that these orientation terms are relative concepts, they are used for relative description and clarification, and may change correspondingly according to a change in a position in which a component is placed in the accompanying drawings. 
     Some embodiments of this application provide a housing. The housing may be applied to a mobile terminal, for example, a mobile phone, a tablet, a personal digital assistant (PDA), or a vehicle-mounted computer. A specific form of the mobile terminal is not particularly limited in the embodiments of this application. For ease of description, an example in which the mobile terminal is a mobile phone is used for description. 
     An architecture of the mobile phone is shown in  FIG. 1 , and includes a front cover  10 , a middle frame  11 , and a back cover  12 . For a touch mobile phone, the front cover  10  may be a touch glass cover provided with a touch electrode. The front cover  10  has a light transmission area  101  and a light shielding area  102  located around the light transmission area  101 . The touch electrode is located in the light transmission area  101 . In addition, the mobile phone further includes a display  13  disposed on one side that is of the front cover  10  and that is close to the middle frame  11 . A surface that is of the display  13  and that is away from the front cover  10  is bonded to the middle frame  11 . Internal components such as a battery, a mainboard, a camera, and an antenna may be disposed on a surface that is of the middle frame  11  and that is away from the display  13 . The back cover  12  is installed on the middle frame  11 , and the back cover  12  can protect the foregoing internal components. 
     The housing provided in the embodiments of this application may be the front cover  10  or the back cover  12  of the mobile phone. A structure of the housing  01  is described below in detail by using an example. 
     Example 1 
     As shown in  FIG. 2 , the housing  01  includes a housing substrate  100 , and the housing substrate  100  has an inner surface and an outer surface. In this application, the outer surface of the housing substrate  100  is a surface that is in direct contact with a finger of a user when the user touches the mobile phone, namely, an outer surface of the housing  01 . The inner surface and the outer surface of the housing substrate  100  are disposed opposite to each other. 
     As shown in  FIG. 2 , the housing  01  further includes at least one double-sided composite texture film  200  located on one side of the inner surface of the housing substrate  100  (in  FIG. 2 , description is provided by using an example in which the housing  01  has one double-sided composite texture film  200 ). 
     The double-sided composite texture film  200  includes a first substrate  201 , a first texture layer  202  located on a first surface of the first substrate  201 , and a second texture layer  212  located on a second surface of the first substrate  201 . 
     The first substrate  201  includes the first surface and the second surface that are disposed opposite to each other. The first surface of the first substrate  201  is close to the housing substrate  100 , and the second surface is away from the housing substrate  100 . 
     In addition, as shown in  FIG. 3 , the first texture layer  202  has a first texture pattern A 1  (as shown in  FIG. 4 a   ) that includes a plurality of grooves  15  and a plurality of bosses  16 , and the second texture layer  212  has a second texture pattern A 2  (as shown in  FIG. 4 b   ) that includes a plurality of grooves  15  and a plurality of bosses  16 . 
     It should be noted that in some embodiments of this application, as shown in  FIG. 3 , the grooves  15  and the plurality of bosses  16  at the first texture layer  202  may be disposed on a surface that is of the first texture layer  202  and that is away from the first substrate  201 ; or the grooves  15  and the plurality of bosses  16  at the first texture layer  202  may be further disposed on a surface that is of the first texture layer  202  and that is close to the first substrate  201 ; or the grooves  15  and the plurality of bosses  16  at the first texture layer  202  may be further disposed inside the first texture layer  202 . This is not limited in this application. 
     A manner of disposing the groove  15  and the boss  16  at the second texture layer  212  is the same as that described above. Details are not described herein again. For ease of description, description is provided below by using an example in which the grooves  15  and the plurality of bosses  16  at the first texture layer  202  may be disposed on a surface that is of the first texture layer  202  and that is away from the first substrate  201 , and the grooves  15  and the plurality of bosses  16  at the second texture layer  212  may be disposed on a surface that is of the second texture layer  212  and that is away from the first substrate  201 . 
     In addition, the first texture pattern A 1  and the second texture pattern A 2  may be the same or may be different. That the first texture pattern A 1  and the second texture pattern A 2  are different means that, sizes, arrangements, disposing angles, and the like of the groove  15  and the boss  16  in the first texture pattern A 1  are different from sizes, arrangements, disposing angles, and the like of the groove  15  and the boss  16  in the second texture pattern A 2 . As shown in  FIG. 4 c   , after the first texture pattern A 1  and the second texture pattern A 2  are superimposed, a new texture pattern may be generated. 
     In some embodiments of this application, sizes of the grooves  15  and the bosses  16  in the first texture pattern A 1  and the second texture pattern A 2  may be of a nanometer scale or a micrometer scale. In this case, according to a Moore fringe interference principle, after the first texture pattern A 1  and the second texture pattern A 2  are superimposed, an interference fringe is easily generated. The interference fringe may be used as a new texture pattern of the housing  01 . The foregoing new texture pattern is more complex than the single-layer first texture pattern A 1  or the single-layer second texture pattern A 2 , so that difficulty in copying and imitating the texture pattern is increased, and a product homogenization degree is reduced. In addition, the first texture pattern A 1  or the second texture pattern A 2  in this embodiment of this application includes the groove  15  and the boss  16 . Therefore, the first texture pattern A 1  or the second texture pattern A 2  is a solid pattern, increasing a solid decorative effect of an appearance of the housing  01 . 
     A structure of the housing  01  shown in  FIG. 2  is used as an example to describe a method for fabricating the housing  01  shown in  FIG. 2 . The fabrication method includes S 101  to S 108 . 
     S 101 : Use polyethylene terephthalate (PET) or a thermoplastic polyurethane (TPU) elastomer to fabricate the first substrate  201 . 
     S 102 : Tile ultraviolet (UV) adhesive  20  on a surface of the first substrate  201 , for example, the first surface, then, as shown in  FIG. 5 a   , roll the UV adhesive through a mold  21  having a texture, and expose the UV adhesive, to form the first texture layer  202  that has the first texture pattern A 1  shown in  FIG. 5 b   , where when the sizes of the groove  15  and the boss  16  in the first texture pattern A 1  are of a nanometer scale (or a micrometer scale), the texture of the mold  21  is a fine texture of a nanometer scale (or a micrometer scale). 
     S 103 : To avoid damage to the first texture pattern A 1  in a subsequent fabrication process, a protective film  22  shown in  FIG. 5 c    may cover a surface that is of the first texture layer  202  and that has the first texture pattern A 1 . Then, a second texture layer  212  having a second texture pattern A 2  is formed on the second surface of the first substrate  201  in a same fabrication manner in S 102 , to complete preparation of one double-sided composite texture film  200 . 
     S 104 : Remove the protective film  22 , and coat, with a bonding layer, for example, an optically clear adhesive (OCA), a surface that is of the first texture layer  202  and that has the first texture pattern A 1 , to form a second bonding layer  32  shown in  FIG. 5 d    and a release film  23  covering the second bonding layer  32 . 
     It should be noted that in this application, a bonding layer that is in direct contact with a surface that is of a texture layer and on which a texture pattern is disposed (for example, the surface that is of the first texture layer  202  and that has the first texture pattern A 1 ) is referred to as the second bonding layer  32 . 
     The second bonding layer  32  is in contact with the first texture layer  202 . In this case, some materials of the second bonding layer  32  can be filled in each groove  15  in the first texture pattern A 1  at the first texture layer  202 . Based on this, a refractive index of the second bonding layer  32  is set to be different from a refractive index of a film layer (for example, the first texture layer  202 ) in contact with the second bonding layer  32 . In this case, even if some materials of the second bonding layer  32  are filled in the groove  15 , because the refractive index of the second bonding layer  32  is different from a refractive index of a boss  16  adjacent to the groove  15 , brightness of light reflected at a position of the groove  15  is different from brightness of light reflected at a position of the boss  16  that are received by an eye of a user. Therefore, the first texture pattern A 1  at the first texture layer  202  can be identified. 
     Based on this, as shown in  FIG. 2 , the housing  01  further includes an optical coating  300  and an ink layer  301  that are sequentially away from the housing substrate  100 . The double-sided composite texture film  200  is located between the optical coating  300  and the housing substrate  100 . 
     Based on this, the method for fabricating the housing  01  further includes: 
     S 105 : Form, by using a vacuum coating process, the optical coating  300  shown in  FIG. 5 e    on one side that is of the double-sided composite texture film  200  and on which the release film  23  is not disposed, namely, the surface that is of the second texture layer  212  and that has the second texture pattern A 2 . The optical coating  300  may also be referred to as a non-conductive vacuum metallized (NCVM) coating. A material that forms the optical coating  300  may be a coating material such as silicon dioxide (SiO 2 ) or titanium dioxide (TiO 2 ). 
     S 106 : Form, by using a printing technology, the ink layer  301  shown in  FIG. 5 e    on a surface that is of the optical coating  300  and that is away from the housing substrate  100 . 
     The ink layer  301  can provide a color for the housing  01 , and the optical coating  300  can make the color of the ink layer  301  brighter. 
     It should be noted that, in the foregoing example, description is provided by using an example in which the housing  01  has the optical coating  300 . In some other embodiments of this application, the optical coating  300  may not be disposed in the housing  01 . For example, in S 105 , the printing technology is used to directly form the ink layer  301  that is in direct contact with the double-sided composite texture film  200  on one side that is of the double-sided composite texture film  200  and on which the release film  23  is not disposed, namely, the surface that is of the second texture layer  212  and that has the second texture pattern A 2 . For ease of description, in most of the following embodiments, a structure in which the optical coating  300  is disposed in the housing  01  is used as an example for description. 
     S 107 : Clean the film, and then cut the cleaned film by using a laser cutting technology or a computerized numerical control (CNC) cut-off knife according to a designed size, for example, a size of a back cover  12  of the mobile phone. 
     S 108 : Remove the release film  23 , and bond the second bonding layer  32  to the housing substrate  100 , to form the housing structure shown in  FIG. 2 . 
     It should be noted that when the housing substrate  100  is a glass substrate, before S 108  is performed, to be specific, before a film obtained through cutting in S 107  is bonded to the glass substrate, a chemical strengthening process needs to be performed on the glass substrate, to increase rigidity of the glass substrate. When the housing substrate  100  provided in the following embodiments is a glass substrate, the chemical strengthening process may be performed on the glass substrate. Details are not described in this application. 
     In addition, the foregoing description is provided by using an example in which the housing  01  shown in  FIG. 2  is the back cover  12  of the mobile phone. When the housing  01  is the front cover  10  of the mobile phone, it can be learned from the foregoing that the front cover  10  has a light transmission area  101  and a light shielding area  102  located around the light transmission area  101 . In this case, as shown in  FIG. 6 , only the foregoing double-sided composite texture film  200 , the optical coating  300 , and the ink layer  301  need to be formed in the light shielding area  102 . For example, in the foregoing S 102  to S 106 , a mask panel is used to shield the light transmission area  101 , to avoid forming, in the light transmission area  101 , a material corresponding to the foregoing film layer. 
     In this case, a film layer formed after S 107  is completed is shown in  FIG. 7 , and is a closed frame structure. A hollow position of the frame structure corresponds to the light transmission area  101 . In this case, the first texture pattern A 1  at the first texture layer  202  and the second texture pattern A 2  at the second texture layer  212  of the double-sided composite texture film  200  may be disposed in the light shielding area  102 , to decorate the light shielding area  102  of the front cover  10  of the mobile phone. 
     Alternatively, to make the front cover  10 , the mask panel may not be used, and instead, a material in the light transmission area  101  of the front cover  10  of the mobile phone may be directly cut in S 107 , so that the closed frame structure may also be obtained. 
     Example 2 
     The foregoing describes the structure and the fabrication method of the housing  01  by using an example in which the housing  01  has one double-sided composite texture film  200 . In some other embodiments of this application, the housing  01  may have a plurality of double-sided composite texture films  200  (for example, in  FIG. 8 , description is provided by using an example in which the housing  01  has two double-sided composite texture films  200 ). In this case, the plurality of double-sided composite texture films  200  are disposed in a stacked manner. 
     Based on this, as shown in  FIG. 8 , a second bonding layer  32  is disposed between any two adjacent double-sided composite texture films  200 . The second bonding layer  32  is in contact with a second texture layer  212  of a double-sided composite texture film  200  located above, and a part of the second bonding layer  32  is filled in a groove  15  in a second texture pattern A 2  of the second texture layer  212 . In addition, the second bonding layer  32  is in contact with a first texture layer  202  of a double-sided composite texture film  200  located below, and a part of the second bonding layer  32  is filled in a groove  15  in a first texture pattern A 1  at the first texture layer  202 . In this case, to enable human eyes to identify the first texture pattern A 1  and the second texture pattern A 2 , it can be learned from the foregoing that a refractive index of the second bonding layer  32  is different from a refractive index of a film layer (for example, the first texture layer  202  or the second texture layer  212 ) in contact with the second bonding layer  32 . 
     A method for fabricating the housing  01  shown in  FIG. 8  is as follows: performing S 101  to S 106  to obtain a double-sided composite texture film  200 , an optical coating  300 , and an ink layer  301  that are disposed in a stacked manner; 
     repeating S 101  to S 103  to make the other double-sided composite texture film  200 ; 
     bonding, through the second bonding layer  32 , the other double-sided composite texture film  200  to a film formed after S 101  to S 106  are performed; and 
     processing a structure obtained after bonding with reference to S 107  and S 108 , to complete the housing  01  having a plurality of texture layers. 
     Example 3 
     Based on a case in which the housing  01  has at least one double-sided composite texture film  200 , as shown in  FIG. 9 , the housing  01  further includes at least one single-sided composite texture film  400 , and the single-sided composite texture film  400  is located on one side of an inner surface of the housing substrate  100 . For example, in  FIG. 9 , the single-sided composite texture film  400  is disposed between the double-sided composite texture film  200  and the housing substrate  100 . 
     The single-sided composite texture film  400  includes a second substrate  401  and a third texture layer  402  located on a surface that is of the second substrate  401  and that is away from the housing substrate  100 . The third texture layer  402  has a third texture pattern A 3  that includes a plurality of grooves and a plurality of bosses. 
     Alternatively, the third texture layer  402  may be disposed on a surface that is of the second substrate  401  and that is close to the housing substrate  100 . This is not limited in this application. For ease of description, description is provided below by using an example in which the third texture layer  402  is located on the surface that is of the second substrate  401  and that is away from the housing substrate  100 . 
     A method for fabricating the housing  01  shown in  FIG. 9  includes: 
     performing S 101  to S 106 , to obtain a double-sided composite texture film  200 , an optical coating  300 , and an ink layer  301  that are disposed in a stacked manner; 
     using PET, TPU, or the like to make the second substrate  401 ; 
     tiling UV adhesive  20  on a surface of the second substrate  401 , rolling the UV adhesive through a mold having a texture, and exposing the UV adhesive to form a third texture layer  402  having a third texture pattern A 3  shown in  FIG. 9 , to complete preparation of the single-sided composite texture film  400 ; 
     coating, with an optically clear adhesive, a surface that is of the second substrate  401  of the single-sided composite texture film  400  and that is away from the third texture layer  402 , to form a third bonding layer  33 , and bonding a release film to a surface that is of the third bonding layer  33  and that is away from the second substrate  401 , where 
     it should be noted that, in this embodiment of this application, a bonding layer that is in direct contact with a film layer that has a flat surface and on which no texture pattern is disposed, for example, a surface that is of the second substrate  401  and that is away from the third texture layer  402  is referred to as the third bonding layer  33 ; 
     bonding, through the second bonding layer  32  formed in S 104 , the single-sided composite texture film  400  to a film formed after S 101  to S 106  are performed; 
     cleaning a film layer formed in the foregoing steps, and then cutting the cleaned film layer according to a designed size through laser cutting or by using a CNC cutting knife; and 
     removing a release film on the third bonding layer  33 , and bonding the film layer formed in the foregoing steps to an inner surface of the housing substrate  100 , to complete the housing  01  having a plurality of texture layers shown in  FIG. 9 . 
     Example 4 
     Based on a case in which the housing  01  has at least one double-sided composite texture film  200 , as shown in  FIG. 10 , the housing  01  further includes a second substrate  401 , and the second substrate  401  is located between a housing substrate  100  and the double-sided composite texture film  200 . 
     A method for fabricating the housing  01  shown in  FIG. 10  is as follows: first performing S 101  to S 106 , to obtain a double-sided composite texture film  200 , an optical coating  300 , and an ink layer  301  that are disposed in a stacked manner; 
     using PET, TPU, or the like to make the second substrate  401 , and coating a surface of the second substrate  401  with an optically clear adhesive to form the third bonding layer  33 ; 
     bonding the release film to a surface that is of the third bonding layer  33  and that is away from the second substrate  401 ; 
     bonding, through the second bonding layer  32  formed in S 104 , a surface that is of the second substrate  401  and on which the third bonding layer  33  is not formed to the film formed after S 101  to S 106  are performed; 
     cleaning a film layer formed in the foregoing steps, and then cutting the cleaned film layer according to a design through laser cutting or by using a CNC cutting knife; and 
     removing a release film on the third bonding layer  33 , and bonding the film layer formed in the foregoing steps to an inner surface of the housing substrate  100 , to complete the housing  01  having a plurality of texture layers shown in  FIG. 10 . 
     In comparison with the solution shown in  FIG. 2 , in the solution shown in  FIG. 10 , the second substrate  401  is added, so that rigidity of the housing  01  and reliability of the housing  01  can be improved by adding the second substrate  401 , to avoid a case in which the optical coating  300  or a texture layer such as the first texture layer  202  or the second texture layer  212  of the housing  01  is cracked in a test and use process of the mobile terminal having the housing  01 . 
     It should be noted that in the foregoing example, the housing substrate  100  may be a glass substrate (for example, 2D glass or 3D glass), a polymethyl methacrylate (PMMA) substrate, a composite plate that includes a PC film substrate and a PMMA film substrate that are disposed in a stacked manner, a resin substrate having same or similar hardness as the glass substrate, or a transparent or translucent inorganic object, for example, a substrate formed by ceramics, sapphire, or the like. This is not limited in this disclosure. 
     In addition, that the inner surface and the outer surface of the housing substrate  100  are flat is used for description in the foregoing examples. To increase a quantity of texture layers of the housing  01 , to increase complexity of a new texture pattern generated after a plurality of texture layers are superimposed. This application provides the following examples. 
     Example 5 
     Based on case in which the housing  01  has at least one double-sided composite texture film  200 . As shown in  FIG. 11 , an inner surface of the housing substrate  100  has a fourth texture pattern A 4 , and the fourth texture pattern A 4  includes a plurality of grooves and a plurality of bosses. 
     In this case, in the method for fabricating the housing  01  shown in  FIG. 10 , a method for fabricating a multi-layer film layer other than the housing substrate  100  is the same as that described above. Details are not described herein again. For ease of description, the multi-layer film layer of the housing  01  other than the housing substrate  100  is referred to as a multi-layer texture composite film  14 . 
     An example in which the housing substrate  100  is a glass substrate is used to describe a fabrication method of the housing substrate  100 . The method includes S 201  to S 202 . 
     S 201 : Etch an inner surface of a glass substrate to form the fourth texture pattern A 4 . 
     For example, the inner surface of the glass substrate is coated with a photoresist material such as acid-resistant ink, photoresist, or metal coating. For example, the photoresist material is a positive photoresist. After exposure and development, a photoresist blocked by a light shielding part of a mask panel is still retained, and a photoresist that is on the inner surface of the glass substrate and that corresponds to a light transmission part of the mask panel is removed. When the photoresist material is a negative photoresist, a position that is on the photoresist and that is illuminated by light is not dissolved in developing liquid, and a position that is not illuminated by light is dissolved in the developing liquid. Next, some materials in an area that is of the glass substrate and that is not covered by the photoresist are etched away by using a dry etching process or a wet etching process. Then, the photoresist is removed, so that the fourth texture pattern A 4  is prepared on the inner surface of the glass substrate. 
     It should be noted that in S 201 , description is provided by using an example in which a photoresist is coated, and a film layer having a pattern is formed on a to-be-etched surface of the glass substrate after exposure and development. In this application, the film layer having a pattern may be further formed on the to-be-etched surface of the glass substrate by using a printing process, or the film layer (for example, an acid-resistant film layer) having a pattern is directly bonded to the to-be-etched surface of the glass substrate by using a film bonding process. This is not limited in this application. Then, the foregoing etching process is performed to form the fourth texture pattern A 4 . 
     S 202 : Perform chemical strengthening on the glass substrate prepared in S 201 , to improve rigidity of the housing substrate  100 . Based on this, in order that the housing substrate  100  having the fourth texture pattern A 4  on the inner surface is bonded to the foregoing multi-layer texture composite film  14 , as shown in  FIG. 11 , the housing  01  further includes a first bonding layer  31  located on the inner surface of the housing substrate  01 . Therefore, the housing substrate  100  is bonded to the multi-layer texture composite film  14  through the first bonding layer  31 . 
     It should be noted that in this embodiment of this application, a bonding layer that is in direct contact with an inner surface that is of the housing substrate  100  and that has the fourth texture pattern A 4  is referred to as the first bonding layer  31 . 
     In addition, some materials of the first bonding layer  31  are filled in a groove on the inner surface of the housing substrate  100 . Therefore, to enable human eyes to identify the fourth texture pattern A 4  on the inner surface of the housing substrate  100 , a refractive index of the first bonding layer  31  is different from a refractive index of the housing substrate  100 , for example, the glass substrate. 
     Alternatively, as shown in  FIG. 12 , an outer surface of the housing substrate  100  has a fifth texture pattern A 5 . The fifth texture pattern A 5  includes a plurality of grooves and a plurality of bosses. 
     A method for fabricating the housing substrate  100  having the fifth texture pattern A 5  is the same as that described above. Details are not described herein again. A difference lies in that when no texture pattern is disposed on the inner surface of the housing substrate  100 , the inner surface of the housing substrate  100  may be bonded to the multi-layer texture composite film  14  through the third bonding layer  33 . A refractive index of the third bonding layer  33  is not limited in this application. 
     Alternatively, as shown in  FIG. 13 , the inner surface of the housing substrate  100  has the fourth texture pattern A 4 , and the outer surface of the housing substrate  100  has the fifth texture pattern A 5 . The method for fabricating the housing substrate  100  and the multi-layer texture composite film  14  shown in  FIG. 13  is the same as that described above. Details are not described herein again. It should be noted that because the inner surface of the housing substrate  100  in  FIG. 13  has the fourth texture pattern A 4 , the housing substrate  100  and the multi-layer texture composite film  14  may be bonded and fastened through the first bonding layer  31  whose refractive index is different from that of the housing substrate  100 . 
     It should be noted that in Example 5, description is provided by using an example in which the housing substrate  100  is a glass substrate. The housing substrate  100  may alternatively be a resin substrate having same or similar hardness as the glass substrate, or may be a transparent or translucent inorganic material, for example, a substrate made of ceramic and sapphire. In this case, the fourth texture pattern A 4  and/or the fifth texture pattern A 5  may also be formed by using a process such as an exposure process or an etching process or a printing process or a film bonding process. Details are not described herein again in this application. 
     In addition, in  FIG. 9  to  FIG. 13 , description is provided by using an example in which the housing  01  has one double-sided composite texture film  200 . The housing  01  may further include a plurality of double-sided composite texture films  200  that are disposed in a stacked manner and a plurality of single-sided composite texture films  400  that are disposed in a stacked manner. A double-sided composite texture film  200  and a single-sided composite texture film  400  may also be disposed in a cross manner. This is not limited in this application. When it is ensured that a thickness of the housing  01  meets a design requirement, a quantity of the double-sided composite texture films  200  and/or a quantity of single-sided composite texture films  400  may be increased as much as possible, so that a more complex pattern is obtained after the foregoing plurality of texture patterns such as the first texture pattern A 1 , the second texture pattern A 2 , the third texture pattern A 3 , the fourth texture pattern A 4 , and the fifth texture pattern A 5  are superimposed. 
     In addition, to improve non-replicability of a pattern formed after texture patterns at a plurality of different layers are superimposed, the first texture pattern A 1 , the second texture pattern A 2 , the third texture pattern A 3 , the fourth texture pattern A 4 , and the fifth texture pattern A 5  may be different from each other. 
     The housing  01  provided in the foregoing example may be used as the back cover  12  of the mobile phone, or may be used as the front cover  10  of the mobile phone. This is not limited in this disclosure. When the housing  01  in Example 2 to Example 5 is the front cover  10 , refer to the method for fabricating the front cover  10  provided in Example 1. Details are not described herein again in this application. 
     Example 6 
     Based on a case in which the housing  01  has at least one double-sided composite texture film  200 , another embodiment of this application provides a housing  01  prepared by using an in-mold injection molding film (IMTL) technology. 
     In this case, the housing substrate  100  of the housing  01  is a hardened layer. Based on this, as shown in  FIG. 14 , the housing  01  further includes a glossy oil buffer layer  302 , an adhesive layer  303 , and an injection molding layer  304  that are sequentially away from the housing substrate  100 . The glossy oil buffer layer  302  is in contact with the ink layer  301 . 
     A method for fabricating the housing  01  shown in  FIG. 14  includes the following operations: 
     performing S 101  to S 103 , to obtain the double-sided composite texture film  200 ; 
     on the foregoing double-sided composite texture film  200 , sequentially forming the optical coating  300  and the ink layer  301  on a surface that is of the second texture layer  212  and that has the second texture pattern A 2 ; 
     on a film obtained after the foregoing steps are completed, sequentially forming, by using a printing process, a glossy oil buffer layer  302  and an adhesive layer  303  that are located on a surface that is of the ink layer  301  and that is away from the double-sided composite texture film  200 ; 
     performing, by using the IMTL process, injection molding on the film obtained after the foregoing steps are completed, to form the injection molding layer  304  on one side that is of the adhesive layer  303  and that is away from the glossy oil buffer layer  302 , where 
     the glossy oil buffer layer  302  can buffer force applied to the optical coating  300  and the ink layer  301  in an injection molding process, to avoid damage to the optical coating  300  and the ink layer  301 ; and 
     in addition, in the injection molding process, an appearance of the injection molding layer  304  may be determined according to a requirement for an appearance of the housing  01 . For example, an appearance having a specific bending radian is formed at an edge position of the housing  01 ; and 
     finally removing the protective layer  22  at the first texture layer  202  of the double-sided composite texture film  200  in S 103 , and forming, by using a spraying process or a sprinkling process, a hardened layer on a texture layer located at an outermost layer, for example, one side that is of the first texture layer  202  and that is away from the injection molding layer  304 , where the hardened layer may be used as the housing substrate  100  of the housing  01 . In this case, in the housing, the first texture layer  202  closest to the hardened layer is in direct contact with the hardened layer. 
     A material that forms the hardened layer may be siloxane, acrylic acid resin, siloxane-containing resin, nano-silicon dioxide, acrylic acid amino resin, or the like. 
     It should be noted that the housing  01  prepared by using the IMTL process is described by using an example in which the housing  01  has one double-sided composite texture film  200 . The housing  01  may further have a plurality of double-sided composite texture films  200  and a plurality of single-sided composite texture films  400 . Details are not described in this application. 
     Example 7 
     Based on a case in which the housing  01  has at least one double-sided composite texture film  200 , another embodiment of this application provides a housing  01  prepared by using a composite plate technology. 
     In this case, the structure of the housing  01  is shown in  FIG. 2 , and the housing substrate  100  of the housing  01  is a hardened layer. In addition, the first substrate  201  of the at least one double-sided composite texture film  200  of the housing  01  is a composite plate that includes at least a polycarbonate (Polycarbonate, PC) film substrate and a PMMA film substrate that are disposed in a stacked manner. 
     A method for fabricating the housing  01  that is provided in Example 7 and that is shown in  FIG. 15  includes the following operations: 
     preliminarily cutting the composite plate including at least a PC film substrate and a PMMA film substrate that are disposed in a stacked manner, to prepare the first substrate  201 ; 
     performing S 102  and S 103 , to obtain the double-sided composite texture film  200 ; 
     on the foregoing double-sided composite texture film  200 , sequentially forming the optical coating  300  and the ink layer  301  on a surface that is of the second texture layer  212  and that has the second texture pattern A 2 ; 
     performing, according to a design requirement of an appearance of the housing  01  by using a hot bending process, hot bending on an edge of a film formed after the foregoing steps are completed; and 
     finally removing the protective layer  22  at the first texture layer  202  of the double-sided composite texture film  200  in S 103 , and forming, by using a spraying process or a sprinkling process, a hardened layer on a texture layer located at an outermost layer, for example, one side that is of the first texture layer  202  and that is away from the ink layer  301 , where the hardened layer may be used as the housing substrate  100  of the housing  01 . In this case, in the housing, the first texture layer  202  closest to the hardened layer is in direct contact with the hardened layer. 
     It should be noted that the housing  01  prepared by using the composite plate process is described by using an example in which the housing  01  has one double-sided composite texture film  200 . The housing  01  may further have a plurality of double-sided composite texture films  200  and a plurality of single-sided composite texture films  400 . Details are not described in this application. In this case, it only needs to be ensured that a first substrate  201  of one of the plurality of double-sided composite texture films  200  is a composite plate including at least a PC film substrate and a PMMA film substrate that are disposed in a stacked manner. A material of a first substrate  201  of the remaining double-sided composite texture film  200  and a material of a second substrate  401  of the single-sided composite texture film  400  are not limited in this application. 
     A housing  01  provided in some other embodiments of this application is shown in  FIG. 16 ,  FIG. 17 , and  FIG. 18 . The housing  01  includes a housing substrate  100  having a texture pattern and at least one single-sided composite texture film  400  located on one side of an inner surface of the housing substrate  100 . Based on this, this application provides the following structure of the housing  01 . 
     Example 8 
     When the housing  01  includes a housing substrate  100  having a texture pattern and at least one single-sided composite texture film  400 , as shown in  FIG. 16 , an inner surface of the housing substrate  100  has a fourth texture pattern A 4 , and the fourth texture pattern A 4  includes a plurality of grooves and a plurality of bosses. 
     A method for fabricating the fourth texture pattern A 4  on the inner surface of the housing substrate  100  and a method for fabricating the single-sided composite texture film  400  are the same as those described above. Details are not described herein again. 
     Similarly, in order that the housing substrate  100  having the fourth texture pattern A 4  on the inner surface is bonded to the single-sided composite texture film  400 , a first bonding layer  31  is disposed on the inner surface of the housing substrate  100 , and a refractive index of the first bonding layer  31  is different from a refractive index of the housing substrate  100 . 
     Example 9 
     When the housing  01  includes a housing substrate  100  having a texture pattern and at least one single-sided composite texture film  400 , as shown in  FIG. 17 , an outer surface of the housing substrate  100  has a fifth texture pattern A 5 , and the fifth texture pattern A 5  includes a plurality of grooves and a plurality of bosses. 
     A method for fabricating the fifth texture pattern A 5  on the outer surface of the housing substrate  100  and a method for fabricating the single-sided composite texture film  400  are the same as those described above. Details are not described herein again. 
     Example 10 
     When the housing  01  includes a housing substrate  100  having a texture pattern and at least one single-sided composite texture film  400 , as shown in  FIG. 18 , an inner surface of the housing substrate  100  has a fourth texture pattern A 4 , and an outer surface of the housing substrate  100  has a fifth texture pattern A 5 . 
     In addition, for any structure in Example 8 to Example 10, the housing  01  further includes an optical coating  300  and an ink layer  301  that are sequentially away from the housing substrate  100 . The optical coating  300  is in contact with a single-sided composite texture film  400  that is farthest away from the housing substrate  100 . 
     It may be learned from the foregoing that in the housing  01  provided in Example 8 to Example 10, a new relatively complex texture pattern, for example, an interference texture pattern, is formed by superimposing texture patterns on the inner surface and/or the outer surface of the housing substrate  100  and a texture pattern at the third texture layer  402  of the at least one single-sided composite texture film  400 , to increase diversity and complexity of a decorative effect of the housing  01 , and to increase decoration duplication difficulty of the housing  01 . 
     In addition, the housing substrate  100  may be a glass substrate, a resin substrate having same or similar hardness as the glass substrate, or a transparent or translucent inorganic material, for example, a substrate made of ceramic and sapphire. 
     Example 11 
     In this example, as shown in  FIG. 21 , the housing  01  further includes at least two single-sided composite texture films  400  that are located on one side of an inner surface of the housing substrate  100 . 
     The single-sided composite texture film  400  includes a second substrate  401  and a third texture layer  402  located on a surface that is of the second substrate  401  and that is away from or close to the housing substrate  100 . The third texture layer  402  has a third texture pattern A 3  that includes a plurality of grooves and a plurality of bosses. 
     It should be noted that for ease of description, description is provided below by using an example in which the third texture layer  402  is located on a surface that is of the second substrate  401  and that is away from the housing substrate  100 . A method for fabricating the single-sided composite texture film  400  is the same as the method for fabricating the single-sided composite texture film  400  in Embodiment 3. Details are not described herein again. 
     Based on this, as shown in  FIG. 21 , the housing  01  further includes a second bonding layer  32  located between two adjacent single-sided composite texture films  400 . 
     When the second bonding layer  32  is in contact with the third texture layer  402 , some materials of the second bonding layer  32  can be filled in each groove  15  in a third texture pattern A 3  of the third texture layer  402 . As described above, in order that the user can identify the third texture pattern A 3  at the third texture layer  402 , a refractive index of the second bonding layer  32  is set to be different from a refractive index of the third texture layer  402  in contact with the second bonding layer  32 . 
     Based on this, as shown in  FIG. 21 , the housing  01  further includes an optical coating  300  and an ink layer  301  that are sequentially away from the housing substrate  100 . A surface on one side of the optical coating  300  is in contact with a surface that is of the single-sided composite texture film  400  and that is away from the housing substrate  100 , and a surface on the other side of the optical coating  300  is in contact with the ink layer  301 . 
     In addition, in this example, the inner surface and the outer surface of the housing substrate  100  may be flat surfaces shown in  FIG. 21 . Alternatively, as shown in  FIG. 16 , the inner surface of the housing substrate  100  has a fourth texture pattern A 4 . Alternatively, as shown in  FIG. 17 , the outer surface of the housing substrate  100  has a fifth texture pattern A 5 . Alternatively, as shown in  FIG. 18 , the inner surface of the housing substrate  100  has a fourth texture pattern A 4 , and the outer surface of the housing substrate  100  has a fifth texture pattern A 5 . 
     Example 12 
     In this example, as shown in  FIG. 22 , the housing  01  further includes at least one single-sided composite texture film  400  that is located on one side of an inner surface of the housing substrate  100 . 
     The housing  01  further includes an injection-molding texture layer  500 . The injection-molding texture layer  500  and the single-sided composite texture film  401  are disposed in a stacked manner. In  FIG. 22 , a surface that is of the injection-molding texture layer  500  and that is away from the housing substrate  100  is bonded to the second substrate  401  of the single-sided composite texture film  400  through the third bonding layer  33 . 
     In addition, the housing substrate  100  is a hardened layer. A surface that is of the injection-molding texture layer  500  and that is close to the hardened layer (namely, the housing substrate  100 ) is in contact with the hardened layer. A surface that is of the injection-molding texture layer  500  and that is in contact with the hardened layer has a sixth texture pattern A 6 , and the sixth texture pattern A 6  includes a plurality of grooves and a plurality of bosses. 
     In this case, a material that forms the injection-molding texture layer  500  may be a plastic material that can be formed by using an injection-molding process, for example, PMMA. In this case, a mold having a pattern that matches the sixth texture pattern A 6  may be used to form the injection-molding texture layer  500  by using the injection molding process. 
     It should be noted that in this embodiment of this application, a bonding layer that is in direct contact with a film layer that has a flat surface and on which no texture pattern is disposed, for example, a surface that is of the injection-molding texture layer  500  and that is away from the hardened layer, and a surface that is of the second substrate  401  and that is close to the hardened layer is referred to as the third bonding layer  33 . 
     Based on this, as shown in  FIG. 22 , the housing  01  further includes an optical coating  300  and an ink layer  301  that are sequentially away from the housing substrate  100 . 
     A housing  01  provided in some other embodiments of this application is shown in  FIG. 19 a    or  FIG. 19 . The housing  01  includes a housing substrate  100 . The housing substrate may be a glass substrate, a resin substrate having same or similar hardness as the glass substrate, or a transparent or translucent inorganic material, for example, a substrate made of ceramic and sapphire. 
     In addition, an inner surface of the housing substrate  100  has a fourth texture pattern, and the fourth texture pattern A 4  includes a plurality of grooves and a plurality of bosses. 
     An outer surface of the housing substrate  100  has a fifth texture pattern A 5 , and the fifth texture pattern A 5  includes a plurality of grooves and a plurality of bosses. 
     A method for respectively fabricating the fourth texture pattern A 4  and the fifth texture pattern A 5  on the inner surface and the outer surface of the housing substrate  100  is the same as that described above. Details are not described herein again. 
     In addition, the housing  01  further includes an ink layer  301  located on one side of the inner surface of the housing substrate. For example, as shown in  FIG. 19 a   , the ink layer  301  may be directly formed on the inner surface of the housing substrate  100  by using a printing process. Alternatively, as shown in  FIG. 19 b   , the optical coating  300  may be directly formed on the inner surface of the housing substrate  100  by using a vacuum evaporation deposition process, and then the ink layer  301  is formed, by using a printing process, on a surface that is of the optical coating  300  and that is away from the housing substrate  100 . 
     It may be learned from the foregoing that in the housing  01  shown in  FIG. 19 a    or  FIG. 19 b   , a new relatively complex texture pattern is formed by superimposing texture patterns of the inner surface and the outer surface of the housing substrate  100 , to increase diversity and complexity of a decorative effect of the housing  01 . In addition, the housing  01  provided in  FIG. 19 a    or  FIG. 19 b    has a simpler structure and a thinner thickness. 
     Some embodiments of this application provide a mobile terminal. As shown in  FIG. 1 , the mobile terminal includes a display  13  and a middle frame  11 . As shown in  FIG. 20 , the display  13  is installed in the middle frame  11 . In addition, the mobile terminal further includes any one of the foregoing housings  01 . The mobile terminal has a technical effect the same as that of the housing provided in the foregoing embodiments. Details are not described herein again. 
     As shown in  FIG. 20 , the housing  01  is a front cover  10 , and the front cover  10  is disposed on an out-light surface of the display  13 . The front cover  10  has a light transmission area  101  and a light shielding area  102  located around the light transmission area  101 . The light transmission area  101  of the front cover  10  can transmit display light emitted by the display  13 , and the light shielding area  102  of the front cover  10  can shield an area that is of the display  13  and in which a drive circuit is disposed. 
     Alternatively, as shown in  FIG. 20 , the housing  01  is a back cover  12 , and the back cover  12  is disposed on one side that is of the middle frame  11  and that is away from the out-light surface of the display  13 , to protect internal components such as a mainboard  17  and a battery  18  that are installed on the middle frame  11 . 
     The foregoing descriptions are merely specific implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.