CN115712214A

CN115712214A - Prism film, backlight module and display device

Info

Publication number: CN115712214A
Application number: CN202211549902.1A
Authority: CN
Inventors: 苏冰淋; 邓佩琴; 陈小芬; 方丽婷; 吴玲
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-02-24

Abstract

The application discloses prism membrane, backlight unit and display device. The prism film comprises a substrate and a prism structure, wherein the surface of the substrate is provided with a plurality of first areas and second areas arranged around at least part of the first areas; the prism structure comprises a plurality of first structures arranged in a first area and a plurality of second structures arranged in a second area, the first structures are provided with a first inclined surface and a second inclined surface, an included angle between the extending directions of the first inclined surface and the second inclined surface is a first included angle, the second structures are provided with a third inclined surface and a fourth inclined surface, and an included angle between the extending directions of the third inclined surface and the fourth inclined surface is a second included angle; the first inclined plane and the second inclined plane of at least part of first structure are at the tip interconnect of keeping away from base member one side, and first contained angle is greater than the second contained angle, and/or, at least part of first structure still includes the cambered surface of connecting between first inclined plane and second inclined plane, and the cambered surface is located the one side that the base member was kept away from to first inclined plane and second inclined plane, and first contained angle is greater than or equal to the second contained angle.

Description

Prism film, backlight module and display device

Technical Field

The application belongs to the technical field of display, and particularly relates to a prism film, a backlight module and a display device.

Background

With the continuous development of the technology, more and more display devices adopt the backlight technology of the direct type micro light source to emit light, for example, many display devices adopt the mini-LED (sub-millimeter light emitting diode) technology to emit light, so as to greatly improve the light emitting efficiency and the display contrast of the display devices.

However, the luminance of the display device is uneven, so that the luminance of the region between two adjacent light sources is low, the uniformity of the luminance of the display device is reduced, and the display effect of the display device is affected.

Disclosure of Invention

The embodiment of the application provides a prism film, a backlight module and a display device, and aims to improve the uniformity of the brightness of the display device.

In a first aspect, an embodiment of the present application provides a prism film, where the prism film includes a substrate and a prism structure, a surface of the substrate has a plurality of first regions and second regions, the first regions are distributed at intervals in a first direction and/or a second direction, the second regions are disposed around at least part of the first regions, and the first direction and the second direction are parallel to a surface where the substrate is located; the prism structure comprises a plurality of first structures arranged in a first area and a plurality of second structures arranged in a second area, wherein the first structures and the second structures are arranged in a manner of protruding out of the base body in a third direction, the third direction is vertical to the surface of the base body, the first structures are provided with a first inclined surface and a second inclined surface, the extending direction of the first inclined surface is intersected with the extending direction of the second inclined surface, the included angle close to one side of the base body is a first included angle, the second structures are provided with a third inclined surface and a fourth inclined surface, the extending direction of the third inclined surface is intersected with the extending direction of the fourth inclined surface, the included angle close to one side of the base body is a second included angle, and the end parts of the third inclined surface and the fourth inclined surface, far away from one side of the base body, are connected with each other; the end parts of the first inclined surface and the second inclined surface of at least part of the first structure, which are far away from one side of the base body, are mutually connected, and the first included angle is larger than the second included angle.

In a second aspect, an embodiment of the present application provides a backlight module, which includes a plurality of light sources and the prism film as in the foregoing first aspect, where the plurality of light sources are distributed at intervals in a first direction and/or a second direction; the prism film is arranged on the light emitting side of the light source, and the orthographic projection of at least part of the first area in the third direction is overlapped with the orthographic projection of the light source in the third direction.

In a third aspect, an embodiment of the present application provides a display device, which includes the backlight module as in the foregoing second aspect.

The prism film provided by the embodiment of the application comprises a base body and a prism structure, wherein a plurality of first areas distributed at intervals in a first direction and/or a second direction and a second area arranged around at least part of each first area are arranged on the surface of the base body. When the prism film is provided to the display device, the base at the first region may be provided to cover a region of the display device where light emission luminance of the light source is strong in the third direction. The matrix at the second region may be provided so as to cover a region of lower emission luminance between adjacent light sources in the third direction. The prism structure comprises a plurality of first structures arranged in the first area and a plurality of second structures arranged in the second area, and the first structures and the second structures are arranged on the base body in a protruding mode in the third direction, so that the first structures and the second structures can change the propagation direction of at least part of light emitted from the base body.

The first structure is provided with a first inclined plane and a second inclined plane, an included angle between the extending direction of the first inclined plane and the extending direction of the second inclined plane and close to one side of the substrate is a first included angle, and light can be refracted or reflected at the first inclined plane and the second inclined plane, so that the light can be relatively concentrated and can be emitted out of the first structure in a certain angle range deviating from the third direction, and the first structure can have certain light condensation capacity. The second structure is provided with a third inclined surface and a fourth inclined surface, an included angle between the extending direction of the third inclined surface and the extending direction of the fourth inclined surface of the second structure and close to one side of the base body is a second included angle, and the end parts of the third inclined surface and the fourth inclined surface, far away from one side of the base body, are mutually connected. Similarly, light can be refracted or reflected at the third inclined plane and the fourth inclined plane, so that the light can be concentrated and emitted out of the second structure in a certain angle range deviating from the third direction, and the second structure can have certain light condensation capacity. When the first inclined plane of first structure and the tip interconnect of second inclined plane keeping away from base member one side, according to the geometry optics principle, the accessible is adjusted the big or small relation between first contained angle and second contained angle and is made first structure and second structure can have different spotlight ability, be greater than the second contained angle through setting up first contained angle, can make the spotlight ability of first structure be less than the spotlight ability of second structure, thereby make the light that jets out the second structure have better luminous luminance in the third direction, the luminous luminance of the light that jets out the first structure in the third direction is less than the luminous luminance of the light that jets out the second structure in the third direction. Therefore, after the light emitted from the region with the stronger light-emitting brightness of the light source passes through the first structure, the brightness of the light in the third direction is not improved too much, and after the light emitted from the region with the weaker light-emitting brightness of the light source passes through the second structure, the brightness of the light in the third direction is greatly improved, so that the brightness difference between the light emitted from the first structure and the light emitted from the second structure is not too great, the uniformity of the whole light-emitting brightness of the display device is improved, and the user experience is enhanced.

When the first structure comprises the cambered surface which is connected between the first inclined surface and the second inclined surface and is far away from one side of the base body, namely the first inclined surface is not directly connected with the end part of the second inclined surface which is far away from one side of the base body, the first inclined surface is connected with the end part of the second inclined surface which is far away from one side of the base body through the cambered surface, and according to the geometrical optics principle, if the first included angle is equal to the second included angle, the light condensation capacity of the first structure provided with the cambered surface is smaller than that of the second structure. If the first included angle is larger than the second included angle, the light gathering capability of the first structure can be further reduced according to the analysis. Therefore, when the first structure further comprises an arc surface connected between the first inclined surface and the second inclined surface and far away from one side of the substrate, the first included angle is larger than or equal to the second included angle, so that the brightness difference between the light emitted by the first structure and the light emitted by the second structure cannot be too large, the uniformity of the whole brightness of the display device is improved, and the user experience is enhanced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural view of a substrate according to some embodiments of the present disclosure;

FIG. 2 is a schematic view of a portion of a display device according to some embodiments of the present disclosure in a cross-section along a third direction;

fig. 3 is a partially enlarged view showing a region a in fig. 2;

FIG. 4 is a schematic view of a portion of a display device according to another embodiment of the present application, taken along a third direction;

fig. 5 is a partially enlarged view showing a region B in fig. 4;

FIG. 6 is a schematic view of an arrangement of light sources according to some embodiments of the present application;

FIG. 7 is a schematic illustration of a substrate according to further embodiments of the present application;

FIG. 8 is a schematic cross-sectional view of a display device according to still another embodiment of the present application along a third direction;

fig. 9 is a partially enlarged view showing a region C in fig. 8;

FIG. 10 is a schematic view of a portion of a display device according to still another embodiment of the present application in a third direction;

fig. 11 is a partially enlarged view showing a region D in fig. 10;

FIG. 12 is a schematic partial structure view of a cross-section of a prismatic film of some embodiments of the present application taken along a third direction;

fig. 13 is a partially enlarged view illustrating a region E in fig. 12;

FIG. 14 is a cross-sectional view of a portion of a prismatic film according to other embodiments of the present application, taken along a third direction;

fig. 15 is a partially enlarged view showing a region F in fig. 14;

FIG. 16 is a schematic structural diagram of a display device according to some embodiments of the present application;

FIG. 17 is a schematic structural view of a prismatic film according to some embodiments of the present application;

FIG. 18 is a schematic structural view of a prismatic film according to further embodiments of the present application;

fig. 19 is a schematic structural diagram of a backlight module according to some embodiments of the present application.

Description of reference numerals:

100-a display device; 100 a-long side; 100 b-short side;

10-a backlight module;

1-a prismatic film; 11-a substrate; 111-a first region; 111 a-first sub-region; 111 b-a second sub-region; 111 c-a third sub-region; 112-a second region; 12-a prismatic structure; 121-a first structure; 121 a-a first bevel; 121 b-a second bevel; 121 c-arc surface; 122-a second structure; 122 a-a third bevel; 122 b-a fourth bevel;

2-a light source; 2 a-a gap; 21-a central light emitting region; 22-edge light emitting areas;

3-a diffusion component; 31-a diffuser plate;

4-reflective polarizers;

x-a first direction;

y-a second direction;

z-a third direction;

phi-a first included angle;

φ ₁ -a first sub-angle;

φ ₂ -a second sub-angle;

theta-a second included angle;

d ₁ -a first pitch;

d ₂ -a second pitch.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide an illustration of the present application and is not intended to show at least some of the known structures and techniques in the drawings and following description so as to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

It is noted that, herein, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Moreover, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" comprises 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

With the development of the technology, more and more display devices adopt the backlight technology of the direct type micro light source to emit light, for example, many display devices adopt the mini-LED (sub-millimeter light emitting diode) technology to emit light, so as to greatly improve the light emitting efficiency and the display contrast of the display devices, and a prism film is often arranged on the light emitting side of the light source in the display devices to condense light, so as to improve the light emitting brightness of the front side of the display devices. However, the applicant has studied and found that the luminance uniformity of the luminance of the entire display device is low, and the display effect of the display device is affected, because the luminance distribution of the light sources within the light emission angle is uneven, that is, the luminance directly above the center of the light source is high, and the luminance above the center of the light source is low, so that the luminance of the region between two adjacent light sources is low.

The present application is provided to solve the above technical problems. For better understanding of the present application, the prism film, the backlight module and the display device according to the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a substrate 11 according to some embodiments of the present disclosure, fig. 2 is a partial structural view of a cross-section of a display device 100 according to some embodiments of the present disclosure along a third direction Z, fig. 3 is a partial enlarged view of a region a in fig. 2, fig. 4 is a partial structural view of a cross-section of a display device 100 according to some embodiments of the present disclosure along the third direction Z, and fig. 5 is a partial enlarged view of a region B in fig. 4. In the figure, phi is a first included angle, theta is a second included angle, the X direction is a first direction, the Y direction is a second direction, the Z direction is a third direction, and the first direction X, the second direction Y and the third direction Z are intersected pairwise.

As shown in fig. 1 to 5, the present embodiment provides a prism film 1, where the prism film 1 includes a substrate 11 and a prism structure 12, a surface of the substrate 11 has a plurality of first regions 111 spaced apart in a first direction X and/or a second direction Y, and a second region 112 surrounding at least a portion of each of the first regions 111, and the first direction X and the second direction Y are parallel to a surface of the substrate 11; the prism structure 12 includes a plurality of first structures 121 disposed in the first region 111 and a plurality of second structures 122 disposed in the second region 112, the first structures 121 and the second structures 122 are both disposed protruding from the substrate 11 in a third direction Z, the third direction Z is perpendicular to the surface of the substrate 11, the first structures 121 have a first inclined surface 121a and a second inclined surface 121b, the extending direction of the first inclined surface 121a intersects the extending direction of the second inclined surface 121b, and the included angle near the substrate 11 is a first included angle Φ, the second structures 122 have a third inclined surface 122a and a fourth inclined surface 122b, the extending direction of the third inclined surface 122a intersects the extending direction of the fourth inclined surface 122b, and the included angle near the substrate 11 is a second included angle θ, and the third inclined surface 122a and the fourth inclined surface 122b are connected to each other at the end far from the substrate 11; the first inclined surface 121a and the second inclined surface 121b of at least part of the first structure 121 are connected to each other at an end portion of the first inclined surface 121a away from the substrate 11, where the first included angle is larger than the second included angle θ, and/or at least part of the first structure 121 includes an arc surface 121c connected between the first inclined surface 121a and the second inclined surface 121b, where the arc surface 121c is located at a side of the first inclined surface 121a and the second inclined surface 121b away from the substrate 11, and the first included angle is larger than or equal to the second included angle θ.

With reference to fig. 1 to 5, a prism film 1 provided in this embodiment of the application includes a substrate 11 and a prism structure 12, where a surface of the substrate 11 has a plurality of first areas 111 spaced apart in a first direction X and/or a second direction Y and a second area 112 surrounding at least a portion of each first area 111, when the prism film 1 is disposed on the display device 100, the substrate 11 in the first areas 111 may be disposed to cover an area with a stronger light-emitting luminance of the light source 2 of the display device 100 in a third direction Z, and the substrate 11 in the second areas 112 may be disposed to cover an area with a lower light-emitting luminance between adjacent light sources 2 in the third direction Z.

The prism structure 12 includes a plurality of first structures 121 disposed in the first region 111 and a plurality of second structures 122 disposed in the second region 112, and both the first structures 121 and the second structures 122 are disposed to protrude from the substrate 11 in the third direction Z, so that the first structures 121 and the second structures 122 can change the propagation direction of at least a portion of the light emitted from the substrate 11.

The first structure 121 has a first inclined surface 121a and a second inclined surface 121b, an included angle between the extending direction of the first inclined surface 121a and the extending direction of the second inclined surface 121b and near the substrate 11 is a first included angle Φ, and light can be refracted or reflected at the first inclined surface 121a and the second inclined surface 121b, so that the light can be emitted out of the first structure 121 in a certain angle range deviating from the third direction Z, and the first structure 121 can have a certain light-gathering capability.

The second structure 122 has a third inclined surface 122a and a fourth inclined surface 122b, an included angle between the extending direction of the third inclined surface 122a and the extending direction of the fourth inclined surface 122b of the second structure 122 near the substrate 11 is a second included angle θ, and the end portions of the third inclined surface 122a and the fourth inclined surface 122b far from the substrate 11 are connected to each other, similarly, light can also be refracted or reflected at the third inclined surface 122a and the fourth inclined surface 122b, so that the light can be more concentrated and can be emitted out of the second structure 122 within a certain angle range deviating from the third direction Z, and thus the second structure 122 can have a certain light-gathering capability.

When the first inclined surface 121a and the second inclined surface 121b of the first structure 121 are connected to each other at the end portion on the side away from the substrate 11, according to the principle of geometric optics, the first structure 121 and the second structure 122 can have different light-gathering capabilities by adjusting the size relationship between the first included angle Φ and the second included angle θ, the first included angle Φ can be greater than 90 degrees by setting the first included angle Φ to be greater than the second included angle θ, for example, the second included angle θ can be 90 degrees, and the first included angle Φ can be greater than 90 degrees, so that the light-gathering capability of the first structure 121 can be smaller than the light-gathering capability of the second structure 122, and thus, after light emitted from a region with stronger light-emitting luminance passes through the first structure 121, the luminance of light in the third direction Z is not too high, and when light emitted from a region with weaker light-emitting luminance passes through the second structure 122, the luminance of light emitted from the region with stronger light-emitting luminance is not too high, so that the luminance of light emitted from the second structure 122 is not too high, and thus, the luminance of light emitted from the second structure 121 and the light-emitting device can not improve the luminance of the whole luminance of the light 100.

When the first structure 121 includes the arc surface 121c connected between the first inclined surface 121a and the second inclined surface 121b and away from the substrate 11, that is, the end portions of the first inclined surface 121a and the second inclined surface 121b away from the substrate 11 are not directly connected, and the end portions of the first inclined surface 121a and the second inclined surface 121b away from the substrate 11 are connected to the arc surface 121c, according to the geometrical optics principle, if the first included angle Φ is equal to the second included angle θ, for example, the second included angle θ may be 90 degrees, and the first included angle Φ may also be 90 degrees, the light gathering capability of the first structure 121 provided with the arc surface 121c is smaller than the light gathering capability of the second structure 122, and if the first included angle Φ is larger than the second included angle θ, for example, the second included angle θ may be 90 degrees, and the first included angle Φ may be larger than 90 degrees, according to the foregoing analysis, the light gathering capability of the first structure 121 may be further reduced. Therefore, when the first structure 121 further includes the arc surface 121c connected between the first inclined surface 121a and the second inclined surface 121b and away from the substrate 11, by setting the first included angle Φ to be greater than or equal to the second included angle θ, the luminance difference between the light emitted from the first structure 121 and the light emitted from the second structure 122 is not too large, the uniformity of the overall luminance of the display device 100 is improved, and the user experience is enhanced.

The material of the substrate 11 and the prism structure 12 is not limited in this application, and in some embodiments, the material of the substrate 11 may be polyethylene terephthalate or the like. In some embodiments, the material of the prism structure 12 may be acrylic or the like.

In some embodiments, the first structure 121 enables light to exit the prism film 1 more intensively within a first preset angle range deviating from the third direction Z, so as to achieve a light condensing effect. In some embodiments, the second structure 122 enables light to be more concentrated to exit the prism film 1 within a second predetermined angle away from the third direction Z, so as to achieve a light condensing effect. In some embodiments, by increasing the angle of the first included angle Φ of the first structure 121, or by providing the arc surface 121c on the first structure 121, the first preset angle can be greater than the second preset angle, so that the concentration degree of the light emitted from the first structure 121 in the third direction Z is smaller than the concentration degree of the light emitted from the second structure 122 in the third direction Z, and the light emitting brightness of the light emitted from the first structure 121 in the third direction Z is lower than the light emitting brightness of the light emitted from the second structure 122 in the third direction Z.

In some embodiments, in the plurality of first structures 121 located in the first region 111, the first inclined surface 121a and the second inclined surface 121b of some of the first structures 121 may be connected to each other at an end portion of the side away from the substrate 11, and the first inclined surface 121a and the second inclined surface 121b of other first structures 121 may be connected to the arc surface 121c between the sides away from the substrate 11. In other embodiments, in the plurality of first structures 121 located in the first region 111, the first inclined surfaces 121a and the second inclined surfaces 121b of all the first structures 121 may be connected to each other at the end portion of the side away from the substrate 11, or the first inclined surfaces 121a and the second inclined surfaces 121b of all the first structures 121 may be connected to the arc surface 121c between the sides away from the substrate 11.

Fig. 6 is a schematic layout view of the light source 2 according to some embodiments of the present application, and fig. 7 is a schematic structural view of the substrate 11 according to other embodiments of the present application.

As shown in fig. 2 to 7, in some embodiments, when the light sources 2 of the display device 100 are arranged at intervals, the base 11 of the first region 111 may be used to cover at least a part of the arrangement of the light sources 2 in the third direction Z, so that the first structure 121 can receive light with higher brightness directly emitted from the light sources 2, and the improvement of the brightness of the light passing through the first structure 121 in the third direction Z is not too high. The base 11 of the second region 112 can be used to cover at least a part of the gap 2a between the adjacent light sources 2 in the third direction Z, so that the second structure 122 can receive the light emitted from the light sources 2 with lower brightness, and the brightness of the light passing through the second structure 122 in the third direction Z will be greatly improved.

Fig. 8 is a partial structure diagram of a cross section of the display device 100 according to still another embodiment of the present application along the third direction Z, fig. 9 is a partial enlarged view illustrating a region C in fig. 8, fig. 10 is a partial structure diagram of a cross section of the display device 100 according to still another embodiment of the present application along the third direction Z, and fig. 11 is a partial enlarged view illustrating a region D in fig. 10.

In some embodiments, the first region 111 is sequentially provided with a first sub-region 111a, a second sub-region 111b and a third sub-region 111c in the second direction Y, and the plurality of first structures 121 are formed to extend along the first direction X and are adjacently disposed in the second direction Y, or the first region 111 is sequentially provided with the first sub-region 111a, the second sub-region 111b and the third sub-region 111c in the first direction X, and the plurality of first structures 121 are formed to extend along the second direction Y and are adjacently disposed in the first direction X; wherein the first included angle phi of the first structure 121 located in the second sub-region 111b is the first sub-included angle phi ₁ The first included angle phi between the first sub-region 111a and the first structure 121 of the third sub-region 111c is a second sub-included angle phi ₂ As shown in fig. 8 and 9, the first sub-angle phi ₁ Greater than the second sub-included angle phi ₂ And/or the arc surface 121c of the first structure 121 located in the second sub-region 111b is a first arc surface, and the arc surfaces 121c of the first structure 121 located in the first sub-region 111a and the third sub-region 111c are second arc surfaces, as shown in fig. 9 and 10, a radius of the first arc surface is greater than a radius of the second arc surface.

In some embodiments, the light source 2 of the display device 100 has a central light-emitting region 21 and an edge light-emitting region 22, wherein, in the third direction Z, the brightness of the light emitted by the light source 2 in the central light-emitting region 21 is greater than the brightness of the light emitted by the light source 2 in the edge light-emitting region 22. When the base 11 of the first region 111 covers at least part of the light source 2 in the third direction Z, by arranging the first sub-region 111a, the third sub-region 111c and the second sub-region 111b located between the first sub-region 111a and the third sub-region 111c, so that the base 11 in the first region 111 is divided to form three sub-regions, the second sub-region 111b may be used to cover the central light-emitting region 21 of the light source 2 in the third direction Z, and the first sub-region 111a and/or the third sub-region 111c may be used to cover the edge light-emitting region 22 of the light source 2 in the third direction Z.

In some embodiments, the aforementioned analysis of the difference between the light-gathering power of the first structure 121 and the light-gathering power of the second structure 122 is performed by setting a first included sub-angle φ ₁ Is greater than a second sub-included angle phi ₂ The light-gathering capability of the first structure 121 disposed at the second sub-region 111b can be weaker than the light-gathering capability of the first structure 121 disposed at the first sub-region 111a and/or the third sub-region 111c, so that the overall brightness of the light emitted from the first structure 121 at the first region 111 is relatively uniform, and the uniformity of the overall brightness of the display device 100 is further improved.

In some embodiments, according to the geometrical optics principle, if the radius of the arc surface 121c connected between the first inclined surface 121a and the second inclined surface 121b is larger, the propagation of the light emitted from the first structure 121 is more dispersed, so that the light-gathering capability of the first structure 121 is poorer, and therefore, by setting the radius of the first arc surface to be larger than the radius of the second arc surface, the light-gathering capability of the first structure 121 disposed at the second sub-region 111b can be weaker than the light-gathering capability of the first structure 121 disposed at the first sub-region 111a and/or the third sub-region 111c, so that the overall brightness of the light emitted from the first structure 121 at the first region 111 is more uniform, and the uniformity of the overall brightness of the display device 100 is further improved.

In some embodiments, the relationship of the orthographic projection area of the first sub-area 111a, the second sub-area 111b and the third sub-area 111c in the third direction Z can be adjusted according to the light emitting characteristics of the light source 2 in the display device 100 to further improve the uniformity of the light emitted from the first structure 121 at the first area 111. For example, the forward projection areas of the first sub-area 111a, the second sub-area 111b, and the third sub-area 111c in the third direction Z may be set to be equal. For another example, the orthographic projection area of the second sub-region 111b in the third direction Z may be set to be slightly larger than the orthographic projection area of the first sub-region 111a and the third sub-region 111c in the third direction Z.

There are various methods for realizing the first included angle phi larger than the second included angle theta, which is not limited in the present application.

Fig. 12 is a partial structural view of a cross-section of the prism film 1 along the third direction Z according to some embodiments of the present disclosure, and fig. 13 is a partial enlarged view illustrating a region E in fig. 12.

As shown in fig. 12 and 13, in some embodiments, the first included angle Φ may be greater than the second included angle θ by arranging that the first structure 121 protrudes above the base 11 in the third direction Z by a height that is less than the height that the second structure 122 protrudes above the base 11 in the third direction Z. In the present embodiment, the contact area between the first structure 121 and the substrate 11 may be greater than or equal to the contact area between the second structure 122 and the substrate 11.

Fig. 14 is a partial structural view illustrating a cross-section of a prism film 1 of other embodiments of the present application along a third direction Z, and fig. 15 is a partial enlarged view illustrating a region F of fig. 14.

In some embodiments, as shown in fig. 14 and 15, the first inclined edge of the first structure 121 is spaced from the end of the second inclined edge adjacent to the substrate 11 by a first distance d ₁ The distance between the end of the third oblique side of the second structure 122 close to the base 11 and the end of the fourth oblique side close to the base 11 is the second distance d ₂ Can be set by setting the first spacing d ₁ Greater than the second distance d ₂ So that the first included angle phi is larger than the second included angle theta. Optionally, the height of the first structure 121 protruding from the substrate 11 in the third direction Z is equal to the height of the second structure 122 protruding from the substrate 11 in the third direction Z.

In some embodiments, it can be further provided that the height of the first structures 121 protruding from the substrate 11 in the third direction Z is smaller than the height of the second structures 122 protruding from the substrate 11 in the third direction Z, and the first distance d ₁ Greater than the second distance d ₂ So that the first included angle phi is larger than the second included angle theta.

The specific shape of the arc surface 121c is not limited in the present application, and the specific shape of the arc surface 121c may be set according to the light emitting characteristics of the light sources 2 of the display device 100 and the distance between the adjacent light sources 2. In some embodiments, the arc surface 121c may be a circular arc surface, and the arc surface 121c may also be formed by combining a plurality of circular arc surfaces.

In some embodiments, the arc surface 121c is a circular arc surface, and the radius of the arc surface 121c is greater than or equal to 5 μm and less than or equal to 45 μm. When the radius of the arc surface 121c is greater than 45 μm, the light-condensing capability of the first structure 121 is poor, which is not favorable for the brightness enhancement effect of the prism film 1. When the radius of the arc surface 121c is less than 5 μm, the difference in light condensing capacity between the first structure 121 and the second structure 122 is small, so that the light equalizing effect of the prism film 1 is not significant.

Fig. 16 is a schematic structural view of a display device 100 according to some embodiments of the present disclosure, fig. 17 is a schematic structural view of a prism film 1 according to some embodiments of the present disclosure, and fig. 18 is a schematic structural view of a prism film 1 according to some other embodiments of the present disclosure, wherein the first structure 121 and the second structure 122 in fig. 17 and 18 are illustrated by using different shadings for convenience of visually distinguishing the extending directions of the first structure 121 and the second structure 122.

As shown in fig. 16 to 18, in some embodiments, the plurality of second structures 122 extend along the first direction X and are adjacently disposed in the second direction Y. As mentioned above, "the light can be emitted out of the second structure 122 in a concentrated manner within a certain angle range deviating from the third direction Z", when the second structure 122 is extended and molded along the first direction X, the second structure 122 can concentrate the light which is dispersed in the second direction Y, so that the concentrated light emitted from the second structure 122 can be distributed in a more uniform manner in the extending direction of the second structure 122, that is, the light can be distributed in the first direction X in a more uniform manner. In some embodiments, the display device 100 has a long side 100a and a short side 100b, and the first direction X may be an extending direction of the long side 100a of the display device 100, so that the light emitted from the second structure 122 is distributed more uniformly in the extending direction of the long side 100a of the display device 100, and the uniformity of the brightness of the display device 100 in the extending direction of the long side 100a is improved.

In some embodiments, at least a portion of the first structures 121 are formed to extend along the first direction X and are disposed adjacent to each other in the second direction Y, and/or at least a portion of the first structures 121 are formed to extend along the second direction Y and are disposed adjacent to each other in the first direction X.

As shown in fig. 17, when the first structure 121 and the second structure 122 are both formed to extend along the first direction X and are adjacently disposed in the second direction Y, the prism structure 12 of the prism film 1 is easy to manufacture and produce.

As shown in fig. 18, when the second structures 122 are formed to extend along the first direction X and are disposed adjacent to each other in the second direction Y, but the first structures 121 are formed to extend along the second direction Y and are disposed adjacent to each other in the first direction X, since "light can be concentrated to emit the first structures 121 within a certain angle range from the third direction Z" as described above, when the first structures 121 are formed to extend along the second direction Y, the first structures 121 can concentrate light which is relatively dispersed in the first direction X, so that the relatively concentrated light emitted from the first structures 121 can be distributed relatively uniformly in the extending direction of the first structures 121, and no light is concentrated in the second direction Y. If the first direction X is the extending direction of the long side 100a of the display device 100 and the second direction Y is the extending direction of the short side 100b of the display device 100, the light that is relatively dispersed in the extending direction of the short side 100b can be concentrated from the second structure 122, but the light that is relatively dispersed is not concentrated in the extending direction of the short side 100b by the first structure 121, so that the luminance difference between the region with stronger light emission and the region with weaker light emission is further reduced, the light concentration capability difference between the first structure 121 and the second structure 122 in the extending direction of the short side 100b is further increased, the light equalizing effect of the prism film 1 is further improved, and the luminance uniformity of the display device 100 in a certain direction is greatly improved.

In some embodiments, the first direction X may be an extending direction of a short side of the display device 100, and the second direction Y may be an extending direction of a long side of the display device 100, which is not limited in the present invention. Fig. 19 is a schematic structural diagram of a backlight module 10 according to some embodiments of the present application.

As shown in fig. 19, according to some embodiments of the present application, there is also provided a backlight module 10, where the backlight module 10 includes a plurality of light sources 2 and the prism film 1 in any of the foregoing embodiments, the plurality of light sources 2 are spaced in the first direction X and/or the second direction Y; the prism film 1 is disposed on the light emitting side of the light source 2, and at least a part of the orthographic projection of the first region 111 in the third direction Z overlaps with the orthographic projection of the light source 2 in the third direction Z. The prism film 1 having the first and

second structures

121 and 122 can uniformize the light emitted from the light source 2 to some extent, thereby improving the uniformity of the brightness of the light of the display device 100.

The type of the light source 2 in the backlight module 10 is not limited in the present application, and in some embodiments, the light source 2 may be a mini-LED.

In some embodiments, the backlight module 10 further includes a diffusion component 3 disposed between the light source 2 and the prism film 1, and the diffusion component 3 can diffuse the light emitted from the light source 2, so that the light emitted from the diffusion component 3 has better brightness uniformity.

In some embodiments, the diffusing member 3 may include a plurality of diffusing plates 31, and the plurality of diffusing plates 31 are stacked in the third direction Z to further improve the brightness uniformity of the display device 100. In some embodiments, the material of the diffusion plate 31 may be a light-transmissive polymer material or a synthetic material, such as glass, polystyrene, polycarbonate, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, acrylic, or the like.

In some embodiments, the backlight module 10 further includes a reflective polarizer 4 disposed on a side of the prism film 1 away from the light source 2, and the reflective polarizer 4 can further improve the brightness gain of the display device 100.

In some embodiments, the orthographic projection of the first area 111 in the third direction Z covers the orthographic projection of the light source 2 in the third direction Z. By setting the orthographic projection of the first area 111 in the third direction Z to cover the orthographic projection of the light source 2 in the third direction Z, the substrate 11 of the first area 111 can sufficiently receive the light with high brightness emitted by the light source 2, so that the light-homogenizing effect of the prism film 1 is improved.

In some embodiments, when the light sources 2 of the display device 100 are arranged at intervals, the orthographic projection of the second area 112 in the third direction Z may cover the orthographic projection of the gap 2a between the adjacent light sources 2 in the third direction Z, so that the substrate 11 of the second area 112 can sufficiently receive the light with lower brightness emitted by the light sources 2, so as to improve the light-homogenizing effect of the prism film 1.

According to some embodiments of the present application, the present application further provides a display device 100, and the display device 100 includes the backlight module 10 in any of the foregoing embodiments.

As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims

1. A prismatic film, comprising:

the surface of the substrate is provided with a plurality of first areas distributed at intervals in a first direction and/or a second direction and second areas arranged around at least part of the first areas, and the first direction and the second direction are parallel to the surface of the substrate;

the prism structure comprises a plurality of first structures arranged in the first area and a plurality of second structures arranged in the second area, wherein the first structures and the second structures are arranged to protrude out of the base body in a third direction, the third direction is perpendicular to the surface of the base body, the first structures are provided with a first inclined surface and a second inclined surface, the extending direction of the first inclined surface is intersected with the extending direction of the second inclined surface, the included angle close to one side of the base body is a first included angle, the second structures are provided with a third inclined surface and a fourth inclined surface, the extending direction of the third inclined surface is intersected with the extending direction of the fourth inclined surface, the included angle close to one side of the base body is a second included angle, and the third inclined surface and the fourth inclined surface are connected with each other at the end part far away from one side of the base body;

the first inclined plane and the second inclined plane of at least part of the first structure are mutually connected at the end part of one side far away from the base body, the first included angle is larger than the second included angle,

and/or, at least part of the first structure comprises an arc surface connected between the first inclined surface and the second inclined surface, the arc surface is positioned at one side of the base body, which is far away from the first inclined surface and the second inclined surface, and the first included angle is larger than or equal to the second included angle.

2. The prism film according to claim 1, wherein the first region is provided with a first sub-region, a second sub-region and a third sub-region in the second direction in this order, a plurality of the first structures are formed extending in the first direction and are adjacently provided in the second direction,

or the first region is sequentially provided with a first sub-region, a second sub-region and a third sub-region in the first direction, and the plurality of first structures extend and form along the second direction and are adjacently arranged in the first direction;

wherein the first included angle of the first structure located in the second sub-region is a first sub-included angle, the first included angle of the first structure located in the first sub-region and the first structure located in the third sub-region is a second sub-included angle, and the first sub-included angle is greater than the second sub-included angle,

and/or the cambered surface of the first structure positioned in the second sub-region is a first cambered surface, the cambered surfaces of the first structure positioned in the first sub-region and the third sub-region are second cambered surfaces, and the radius of the first cambered surface is greater than that of the second cambered surface.

3. The prismatic film of claim 2 wherein the first, second and third subregions have an orthographic area in the third direction that is equal.

4. The prismatic film of claim 1 wherein the first structures protrude from the base in the third direction to a lesser height than the second structures protrude from the base in the third direction.

5. The prismatic film of claim 1 wherein a distance between an end of the first hypotenuse of the first structure adjacent to the base and an end of the second hypotenuse adjacent to the base is a first pitch, a distance between an end of the third hypotenuse of the second structure adjacent to the base and an end of the fourth hypotenuse adjacent to the base is a second pitch, and wherein the first pitch is greater than the second pitch.

6. The prism film of claim 1, wherein the curved surface is a circular arc surface having a radius of greater than or equal to 5 μm and less than or equal to 45 μm.

7. The prismatic film of any of claims 1 to 6 wherein a plurality of said second structures are formed extending along said first direction and are adjacently disposed in said second direction.

8. The prismatic film of claim 7 wherein at least some of said first structures are formed to extend in said first direction and are disposed adjacent in said second direction and/or at least some of said first structures are formed to extend in said second direction and are disposed adjacent in said first direction.

9. A backlight module, comprising:

a plurality of light sources which are distributed at intervals in a first direction and/or a second direction;

the prism film according to any one of claims 1 to 8, which is disposed on a light exit side of the light source, and an orthogonal projection of at least a part of the first region in the third direction overlaps with an orthogonal projection of the light source in the third direction.

10. A backlight module according to claim 9, wherein an orthographic projection of the first area in the third direction covers an orthographic projection of the light source in the third direction.

11. A display device comprising the backlight module according to any one of claims 9 to 10.