阅读说明：本技术 光学膜片及其制备方法、背光模组及显示装置 (Optical film, preparation method thereof, backlight module and display device ) 是由 张罗 张晓萍 吴昊 任健 郑仰利 范利涛 禹映雪 王耀东 刘芳怡 印思琪 于 2021-08-05 设计创作，主要内容包括：一种光学膜片,包括：依次叠设的上棱镜层、基材层、下棱镜层、粘结层以及扩散膜层；下棱镜层位于基材层远离上棱镜层的一侧,上棱镜层、下棱镜层与基材层为一体结构；下棱镜层与扩散膜层通过粘结层进行连接。(An optical film, comprising: the upper prism layer, the base material layer, the lower prism layer, the bonding layer and the diffusion film layer are sequentially stacked; the lower prism layer is positioned on one side of the substrate layer far away from the upper prism layer, and the upper prism layer, the lower prism layer and the substrate layer are of an integrated structure; the lower prism layer is connected with the diffusion film layer through the bonding layer.)

1. An optical film, comprising: the upper prism layer, the base material layer, the lower prism layer, the bonding layer and the diffusion film layer are sequentially stacked;

the lower prism layer is positioned on one side of the substrate layer far away from the upper prism layer, and the upper prism layer, the lower prism layer and the substrate layer are of an integral structure;

the lower prism layer is connected with the diffusion film layer through the bonding layer.

2. The optical film according to claim 1, wherein the upper prism layer and the lower prism layer each comprise a plurality of prism columns, and the prism column direction of the upper prism layer and the prism column direction of the lower prism layer are perpendicular to each other.

3. The optical film of claim 1, wherein the diffusion film layer comprises: the diffusion substrate layer and the diffusion particle layer of establishing fold, the diffusion substrate layer passes through the tie coat with the lower prism layer is connected, the diffusion particle layer is located the diffusion substrate layer is kept away from one side of tie coat.

4. The optical film according to claim 3, wherein the diffusion particles of the diffusion particle layer have a particle size distribution of between 1 μm and 15 μm.

5. The optical film of claim 1, wherein the diffusion film layer comprises: fold diffusion substrate layer and the ultraviolet glue microstructured layer of establishing, the diffusion substrate layer passes through the tie coat with the lower prism layer is connected, the ultraviolet glue microstructured layer is located the diffusion substrate layer is kept away from one side of tie coat.

6. The optical film of claim 1, wherein the bonding layer is filled with diffusing particles.

7. The optical film according to claim 2, wherein the prism angles of the plurality of prism columns of the upper prism layer are the same; the prism angles of the prism columns of the lower prism layer are the same.

8. The optical film according to claim 2, wherein the prism columns of the upper prism layer have a thickness of H1, 10 μm H1 μm 30 μm;

the thickness of the prism row of the lower prism layer is H2, and H2 is more than or equal to 10 microns and less than or equal to 30 microns.

9. The optical film according to claim 2, wherein the upper prism angle of the prism columns of the upper prism layer is θ 1, 80 ° ≦ θ 1 ≦ 100 °; the lower prism angle of the prism columns of the lower prism layer is theta 2, and theta 2 is larger than or equal to 80 degrees and smaller than or equal to 100 degrees.

10. The optical film according to claim 2, wherein the upper prism angles of the plurality of prism columns of the upper prism layer are the same; the lower prism angles of the prism columns of the lower prism layer are the same.

11. The optical film of claim 1, wherein the substrate layer has a thickness of H3, 20 μm H3 μm 100 μm; the thickness of the bonding layer is H4, and H4 is more than or equal to 1 mu m and less than or equal to 20 mu m; the thickness of the diffusion base material layer is H5, and H5 is more than or equal to 20 microns and less than or equal to 100 microns.

12. A method for producing an optical film, for producing the optical film according to any one of claims 1 to 11, comprising:

forming an upper prism layer and a lower prism layer on a base material layer, wherein the upper prism layer, the lower prism layer and the base material layer are of an integrated structure;

and the side, far away from the base material layer, of the lower prism layer is connected with the diffusion film layer through the bonding layer.

13. The method of claim 12, wherein forming the upper and lower prism layers on the substrate layer comprises:

forming the upper prism layer on the substrate layer, and then forming the lower prism layer; or, the lower prism layer is formed on the substrate layer firstly, and then the upper prism layer is formed.

14. The method of claim 12, wherein forming the upper and lower prism layers on the substrate layer comprises:

the base material layer passes through ultraviolet curing one shot forming go up the prism layer, unreel after the optical film rolling that has formed the prism layer the base material layer passes through ultraviolet curing one shot forming down the prism layer.

15. A method according to claim 12, wherein the forming of the upper prism layer and the lower prism layer on the substrate layer and the joining of the diffusion film layer on the side of the lower prism layer away from the substrate layer by the adhesive layer comprise:

the substrate layer passes through ultraviolet curing one shot forming prism layer down, and pass through the tie coat will diffusion film layer laminating extremely down prism layer is to unreeling again after the optical film rolling of prism layer and laminating diffusion film layer under having formed the substrate layer passes through ultraviolet curing one shot forming go up the prism layer.

16. A backlight module comprising the optical film as claimed in any one of claims 1 to 11.

17. A display device comprising the backlight module of claim 16, and further comprising a display panel disposed on a light-emitting side of the backlight module.

Technical Field

The present disclosure relates to display technologies, and particularly to an optical film, a method for manufacturing the optical film, a backlight module and a display device.

Background

With the development of Display technology, Liquid Crystal Display (LCD) products are continuously pursuing ultra-thin Display experience in design. Among them, the backlight Unit (BLU) is one of the important components of the lcd, and since the liquid crystal itself does not emit Light, the lcd needs the backlight Unit to provide a Light source with sufficient brightness and uniform distribution, so that the lcd can normally display. Through carrying out the thinization design to backlight unit, can realize the thickness of attenuate display module assembly.

Disclosure of Invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

The embodiment of the disclosure provides an optical film, a preparation method thereof, a backlight module and a display device, which can effectively reduce the thickness of the optical film.

In a first aspect, embodiments of the present disclosure provide an optical film, including: the prism film comprises an upper prism layer, a base material layer, a lower prism layer, a bonding layer and a diffusion film layer which are sequentially stacked. The lower prism layer is located on one side, away from the upper prism layer, of the base material layer, and the upper prism layer, the lower prism layer and the base material layer are of an integrated structure. The lower prism layer is connected with the diffusion film layer through the bonding layer.

In a second aspect, embodiments of the present disclosure provide a method for preparing an optical film, for preparing the optical film as described above, the method comprising: forming an upper prism layer and a lower prism layer on a base material layer, wherein the upper prism layer, the lower prism layer and the base material layer are of an integrated structure; and the side, far away from the base material layer, of the lower prism layer is connected with the diffusion film layer through the bonding layer.

In a third aspect, an embodiment of the present disclosure provides a backlight module including the optical film as described above.

In a fourth aspect, an embodiment of the present disclosure provides a display device, which includes the above backlight module and further includes a display panel, where the display panel is disposed on a light emitting side of the backlight module.

The optical film provided by the embodiment of the disclosure can effectively reduce the thickness of the optical film on the basis of ensuring the rigidity of the optical film, and can improve the production efficiency.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.

Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

FIG. 1 is a schematic structural diagram of an optical film;

fig. 2 is a schematic structural diagram of an optical film provided in an embodiment of the present disclosure;

FIG. 3 is an enlarged view of a portion of area A of FIG. 2;

FIG. 4 is a schematic thickness diagram of a plurality of structures of an optical film according to at least one embodiment of the present disclosure;

fig. 5 is a schematic cross-sectional structure diagram of an upper prism layer of an optical film according to at least one embodiment of the present disclosure;

fig. 6 is a schematic cross-sectional structure view of a lower prism layer of an optical film according to at least one embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of an optical film according to another embodiment;

FIG. 8 is a schematic view illustrating a process of forming the upper prism layer, the lower prism layer and the substrate layer by UV curing in one step according to an embodiment;

FIG. 9 is a schematic view illustrating a structure of a backlight module according to an embodiment;

fig. 10 is a schematic structural diagram of a display device according to an embodiment.

Detailed Description

The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.

The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.

In the present disclosure, "perpendicular" refers to a state in which an angle formed by two straight lines is 80 ° or more and 100 ° or less, and thus, may include a state in which an angle is 85 ° or more and 95 ° or less.

In some implementations, thinning the BLU display film includes: thinning the PET substrate, and adopting three-in-one film material and other modes. However, when the base material PET is thinned, the film performance cannot be guaranteed, and the base material is too thin and has reduced rigidity, and is easily deformed by temperature change. The method of three-in-one film material can also be adopted for thinning the BLU display film material. As shown in fig. 1, in some three-in-one films, three films are sequentially bonded together only by glue, and although the rigidity problem is solved to a certain extent, the thickness of the film is not actually reduced, and the requirement of thinning cannot be met. Meanwhile, the transmittance of the film material is greatly reduced due to too many glue layers, the brightness of the film material is sacrificed by more than 10%, and the performance of the film material is not ideal.

Fig. 1 is a schematic structural diagram of an optical film. The optical film in fig. 1 includes: the solar cell comprises an upper prism layer 101, an upper PET substrate layer 102, a prism glue layer 103, a lower prism layer 104, a lower PET substrate layer 105, a diffusion glue layer 106, a diffusion substrate layer 107 and a diffusion particle layer 108 which are sequentially stacked. The upper prism layer 101 is located above the upper PET base material layer 102, the lower prism layer 104 is located above the lower PET base material layer 105, and the upper PET base material layer 102 is connected with the lower prism layer 104 through the prism glue layer 103. The lower PET substrate layer 105 is connected to a diffusion film layer, which includes a diffusion substrate layer 107 and a diffusion particle layer 108, through a diffusion glue layer 106. As can be seen from FIG. 1, the thickness is larger due to the larger number of the film layers in the structure, and the transmittance of the film is greatly reduced due to the excessive glue layer.

Fig. 2 is a schematic structural diagram of an optical film provided in an embodiment of the disclosure, and fig. 3 is a partially enlarged view of a region a in fig. 2. As shown in fig. 2 and 3, embodiments of the present disclosure provide an optical film, including: the prism film comprises an upper prism layer 201, a base material layer 202, a lower prism layer 203, an adhesive layer 204 and a diffusion film layer which are sequentially stacked. The lower prism layer 203 is located on the side of the substrate layer 202 away from the upper prism layer 201, in fig. 2, the upper prism layer 201 is located above the substrate layer 202, and the lower prism layer 203 is located below the substrate layer 202. The upper prism layer 201, the lower prism layer 203, and the base material layer 202 may be an integral structure. The lower prism layer 203 is connected to the diffuser film layer by an adhesive layer 204.

Compared with the optical film in fig. 1, the optical film in the embodiment of the disclosure is only provided with one substrate layer, so that the number of the substrates is reduced, and the thickness of the optical film can be effectively reduced. The relative both sides of this disclosed embodiment of optical diaphragm at the substrate layer are provided with the prism structure, and substrate and upper and lower prism structure as an organic whole, and this kind of structure has not only ensured optical diaphragm's rigidity, has reduced the risk of film fold, has reduced the membrane material equipment process of BLU firm moreover, improves production efficiency, makes the BLU cost further reduce. In addition, the number of the film layers using glue is reduced, the overall light transmittance of the optical film is improved, and the thickness of the optical film is further reduced.

In some exemplary embodiments, the substrate layer 202 may be a PET substrate.

In some exemplary embodiments, the adhesive layer 204 may be formed of a glue such as OC glue or UV glue, for example.

In some exemplary embodiments, each of the upper prism layer 201 and the lower prism layer 203 includes a plurality of prism columns, and a prism column direction of the upper prism layer 201 and a prism column direction of the lower prism layer 203 are perpendicular to each other.

In some exemplary embodiments, the diffusion film layer includes a diffusion substrate layer 205 and a diffusion particle layer 206 stacked together. The diffusion substrate layer 205 is connected to the lower prism layer 203 via the adhesive layer 204, and the diffusion particle layer 206 is located on the side of the diffusion substrate layer 205 away from the adhesive layer 204.

In some exemplary embodiments, the thickness refers to a length in a direction perpendicular to a plane in which the optical film is located. As shown in fig. 4, the thickness of the prism array of the upper prism layer 201 is H1, H1 represents the maximum thickness of the prism array of the upper prism layer 201, i.e., the maximum distance between the prism array and the plane where the optical film is located, and H1 has a value range of: h1 is more than or equal to 10 microns (mum) and less than or equal to 30μm. Within this range, the thicknesses of the prism columns of the upper prism layer 201 may be different.

In some exemplary embodiments, as shown in fig. 4, the thickness of the prism columns of the lower prism layer 203 is H2, H2 represents the maximum thickness of the prism columns of the lower prism layer 203, i.e., the maximum distance between the prism columns and the plane where the optical film is located, and H2 has a value in the range of: h2 is more than or equal to 10 mu m and less than or equal to 30 mu m. Within this range, the thicknesses of the prism columns of the lower prism layer 203 may be different.

In some exemplary embodiments, as shown in fig. 4, the thickness of the substrate layer 202 is H3, and the value range of H3 is: h3 is more than or equal to 20 mu m and less than or equal to 100 mu m.

In some exemplary embodiments, as shown in fig. 4, the thickness of the bonding layer 204 is H4, and the value range of H4 is: h4 is more than or equal to 1 mu m and less than or equal to 20 mu m.

In some exemplary embodiments, as shown in fig. 4, the thickness of the diffusion substrate layer 205 is H5, and the range of the value of H5 is: h5 is more than or equal to 20 mu m and less than or equal to 100 mu m.

In some exemplary embodiments, the rounded particles at the bottom of fig. 4 represent diffusion particles having a particle size distribution between 1 μm and 15 μm. The diffusion particles may be made of nylon or polyurethane, and the material of the diffusion particles is not limited in this embodiment.

Fig. 5 is a schematic cross-sectional view of the upper prism layer 201. The upper prism layer 201 includes a plurality of prism columns each having a substantially triangular sectional shape, and an angle between two inclined surfaces extending at a vertex of each triangle (i.e., a vertex angle of the triangle in fig. 5) is defined as an upper prism angle θ 1. In some exemplary embodiments, θ 1 has a value range of: theta 1 is more than or equal to 80 degrees and less than or equal to 100 degrees. In the upper prism layer 201, the value of the upper prism angle θ 1 of each prism row may be the same, which is not limited in this embodiment.

Fig. 6 is a schematic cross-sectional view of the lower prism layer 203. The lower prism layer 203 includes a plurality of prism columns each having a substantially triangular sectional shape, and an angle between two inclined surfaces extending at a vertex of each triangle is defined as a lower prism angle θ 2. In some exemplary embodiments, θ 2 has a value range of: theta 1 is more than or equal to 80 degrees and less than or equal to 100 degrees. In the lower prism layer 203, the value of the lower prism angle θ 2 of each prism column may be the same, which is not limited in this embodiment.

In some exemplary embodiments, the adhesive layer 204 may be filled with diffusion particles, so that the optical film has a certain haze effect, the light efficiency is improved to a certain extent, and the shielding capability of the optical film can also be improved.

In some exemplary embodiments, as shown in fig. 7, embodiments of the present disclosure provide an optical film, including: the multilayer prism film comprises an upper prism layer 201, a base material layer 202, a lower prism layer 203, a bonding layer 204, a diffusion base material layer 205 and an Ultraviolet (UV) glue microstructure layer 207 which are sequentially stacked. Compared with the optical film shown in fig. 2, in the optical die provided in this embodiment, the diffusion particle layer 206 may be replaced by an Ultraviolet (UV) glue microstructure layer 207, that is, the UV glue photocuring microstructure is used to replace diffusion particles, so that the haze effect of the optical film can be improved, and the shielding capability of the optical film can be improved.

In some exemplary embodiments, the diffusion particle layer may be replaced by both filling the bonding layer 204 with diffusion particles and photocuring the microstructure with UV glue to achieve greater haze effect and hiding power.

The embodiment of the present disclosure provides a method for preparing an optical film, which is used for preparing the optical film in any one of the embodiments, and includes:

an upper prism layer 201 and a lower prism layer 203 are formed on a base material layer 202, and the upper prism layer 201, the lower prism layer 203 and the base material layer 202 are of an integral structure;

the diffusion film layer is attached to the lower prism layer 203 on the side away from the substrate layer 202 by an adhesive layer 204.

For example, the upper prism layer 201, the substrate layer 202, and the lower prism layer 203 may be manufactured as an integral structure by an integral molding method. The upper prism layer 201 is located above the substrate layer 202, and the lower prism layer 203 is located below the substrate layer 202.

In some exemplary embodiments, the upper prism layer 201, the lower prism layer 203 and the substrate layer 202 may be formed in one step by uv curing.

In some exemplary embodiments, the step of preparing the optical film is: the upper prism layer 201 and the base material layer 202 are firstly formed in one step through ultraviolet light curing, the lower prism layer 203 and the base material layer 202 are wound after one step through ultraviolet light curing (winding means that a processed film layer is wound by a winding drum), then the film layer is unwound (unwinding means that the film layer wound on the winding drum is unwound so as to carry out corresponding process treatment), and the diffusion film layer and the lower prism layer 203 are attached together through the bonding layer 204. In this embodiment, reference may be made to fig. 8 for a process of forming the upper prism layer 201, the lower prism layer 203, and the substrate layer 202 in one step through ultraviolet curing.

As shown in fig. 8, the feeding roller 1 is used for placing a roll of a PET substrate, the PET substrate can be unreeled, the mold 2 is used for preparing an upper prism layer 201 on one side of the PET substrate, the mold 2 is in a zigzag shape, the zigzag shape is determined according to the thickness H1 of a plurality of prism columns of the upper prism layer 201 and the upper prism angle θ 1 of each prism column, when the PET substrate reaches the mold 2 through a plurality of feeding rollers 9, the glue applicator 4 injects a light-curing material (such as UV glue) into a zigzag space enclosed by the mold 2 and the PET substrate, the light-curing material is cured under the irradiation of the ultraviolet light emitted by the UV light applicator 6, and the upper prism layer 201 is cured and formed on one side of the PET substrate after the PET substrate passes through the mold 2. After the upper prism layer 201 is prepared, the PET substrate continues to advance along the track defined by the plurality of material passing rollers 9, and when reaching the mold 3, the other side of the PET substrate is in contact with the mold 3. The mold 3 is used for preparing the lower prism layer 203 on the other side of the PET substrate, the mold 3 is in a zigzag shape, the shape of the zigzag is determined according to the thickness H2 of a plurality of prism columns of the lower prism layer 203 and the lower prism angle θ 2 of each prism column, when the PET substrate reaches the mold 3 through a plurality of material passing rollers 9, the gluing machine 5 injects a light-curing material (such as UV glue) into a zigzag space enclosed by the mold 3 and the PET substrate, the light-curing material is cured under the irradiation of the ultraviolet light emitted by the UV irradiator 7, and the lower prism layer 203 is cured and formed on the other side of the PET substrate after the PET substrate passes through the mold 3. After the PET substrate passes through the die 3, the upper prism layer 201 and the lower prism layer 203 are completely prepared on the PET substrate, and the prepared film layer is wound by the material receiving roller 8. The wound roll may be transferred to a subsequent process, for example, by bonding the diffusion film layer to the lower prism layer 203 via the adhesive layer 204. The multiple material passing rollers 9 in fig. 8 may respectively implement different functions, such as cleaning, static electricity elimination, etc., and different functions may be set according to actual needs, which is not limited in this embodiment. After the PET substrate passes through the die 3, a plurality of material passing rollers 9 can be further arranged for preparing the protective film layer on one side or two sides of the PET substrate, and the embodiment does not limit how and what kind of protective film layer is prepared.

In some exemplary embodiments, the step of preparing the optical film is: the upper prism layer 201 and the base material layer 202 are firstly wound after being subjected to ultraviolet curing one-step forming, then are unreeled, the lower prism layer 203 and the base material layer 202 are subjected to ultraviolet curing one-step forming, and finally the diffusion film layer and the lower prism layer 203 are attached together through the bonding layer 204.

In some exemplary embodiments, the step of preparing the optical film is: the lower prism layer 203 and the base material layer 202 are subjected to ultraviolet curing one-step forming, the diffusion film layer and the lower prism layer 203 are adhered together through the bonding layer 204 and then are wound, then the unwinding is carried out, and the upper prism layer 201 and the base material layer 202 are subjected to ultraviolet curing one-step forming.

According to the preparation method in the embodiment of the disclosure, the upper prism layer, the substrate layer and the lower prism layer are not required to be bonded and fixed through glue, so that the preparation procedures are reduced, the production efficiency is improved, and the cost of the BLU (module) is further reduced. By reducing the number of the film layers using glue, the overall light transmittance of the optical film is improved, and the thickness of the optical film is further reduced.

The embodiment of the present disclosure provides a backlight module including the optical film in any of the above embodiments.

In some exemplary embodiments, the structure of the backlight assembly is as shown in fig. 9. Fig. 9 shows a side-entry light source structure in which a light guide plate 301, a reflective sheet 302, and a frame 303 are provided in this order below a diffusion particle layer 206 of an optical film. The light-emitting surface of the light guide plate 301 faces the lower surface of the optical film, contacts the diffusion particle layer, and reflects light emitted from the LED light source to the upper optical film, and the solid line from the LED in the figure indicates the path of the light. The frame 303 serves as a support and protection, and may be a frame structure made of metal (e.g., iron) or other materials. The present embodiment does not limit the light source structure of the backlight module, which light source is adopted, and the like.

The embodiment of the present disclosure provides a display device, which includes the backlight module in the above embodiments, and further includes a display panel, where the display panel is disposed on the light-emitting side of the backlight module.

In some exemplary embodiments, the structure of the display device is as shown in fig. 10. A light-shielding Adhesive layer 401, a lower polarizer 402, a display panel 403, an upper polarizer 404, an Optical Clear Adhesive (OCA) layer 405, and a cover plate 406 are sequentially disposed on a side of the upper prism layer 201 of the backlight module away from the substrate layer. The light-shielding adhesive layer 401 is used for connecting the upper prism layer 201 and the lower polarizer 402. Illustratively, the light-shielding glue layer can be a structure with a hollow-out middle part, the hollow-out part transmits light of the backlight source, and the light-shielding glue layer is only of a circle of surrounding structure. The optical adhesive layer 405 is used to connect the polarizer 404 and the cover plate 406. The solid lines from the backlight LEDs indicate the paths of the light rays. The embodiment does not limit the light source structure of the backlight module of the display device, the light source and the like, and does not limit the light-shielding glue and the optical glue which are made of the materials, the structures of the upper and lower polaroids and the materials of the cover plate.

The drawings in this disclosure relate only to the structures to which this disclosure relates and other structures may be referred to in the general design. Without conflict, features of embodiments of the present disclosure, i.e., embodiments, may be combined with each other to arrive at new embodiments.

It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present disclosure without departing from the spirit and scope of the present disclosure, and the scope of the appended claims should be accorded the full scope of the disclosure.