Structural optical film and backlight module

Abstract

A backlight module comprises a structural optical film, a composite film, a brightness enhancement film, a light guide plate and a plurality of light-emitting elements. The structural optical film comprises a structural optical body and a structural layer, the structural optical body is provided with a first light-emitting surface and a first bottom surface which are opposite, and the structural layer is arranged on the first bottom surface. The structural layer comprises a plurality of first strip-shaped structures and a plurality of optical diffusion structures, the first strip-shaped structures are arranged at intervals, and the optical diffusion structures are arranged among the first strip-shaped structures. The composite film is arranged on one side of the first light-emitting surface and provided with a second light-emitting surface. The brightness enhancement film is arranged on one side of the second light emitting surface. The light guide plate is arranged on one side of the first bottom surface, the light guide plate is provided with a light incident surface, an upper surface and a lower surface, and the upper surface faces the first bottom surface of the structural optical film. The light-emitting element is arranged on one side of the light incident surface of the light guide plate.

Description

Technical Field

[0001] The invention relates to a structural optical film and an optical module, in particular to a structural optical film which improves light uniformity and maintains brightness gain effect and a backlight module with a concentrated light viewing angle. Background Art

[0002] Existing display devices usually use backlight modules as light sources, so the light emitted by the backlight modules will affect the effect of the display device presenting the picture, and also affect the quality of the user's viewing. Backlight modules include direct-down type and side-view type according to the position of the light source. Among them, the side-view backlight module usually uses a light guide plate to convert the light generated by the light source into a surface light source. However, the current structure of the backlight module still cannot effectively concentrate the light output angle, thereby affecting the image quality of the user viewing the display device. Summary of the invention

[0003] The present invention provides a structured optical film and a backlight module. The structured optical film improves light uniformity and maintains brightness. The backlight module with the structured optical film converges the light viewing angle and improves brightness. Compared with the existing backlight module, the present invention meets the demand for more power saving at the same brightness.

[0004] In order to achieve one or part or all of the above-mentioned purposes or other purposes, one embodiment of the present invention provides a backlight module, including a structural optical film, a composite film, a brightness enhancement film, a light guide plate and a plurality of light-emitting elements, wherein the structural optical film includes a structural optical body and a structural layer, the structural optical body has a first light-emitting surface and a first bottom surface opposite to each other, the structural layer is arranged on the first bottom surface, the structural layer includes a plurality of first strip structures and a plurality of optical diffusion structures, the first strip structures are arranged at intervals, and the optical diffusion structures are arranged between the first strip structures; the composite film is arranged on one side of the first light-emitting surface of the structural optical film, the composite film has a second light-emitting surface and a second bottom surface opposite to each other A second bottom surface, the second bottom surface faces the first light emitting surface of the structural optical film, the second light emitting surface is provided with a plurality of second strip structures, and the second bottom surface is provided with an anti-adsorption layer; a brightness enhancement film is arranged on one side of the second light emitting surface of the composite film, the brightness enhancement film has a third light emitting surface and a third bottom surface opposite to each other, the third bottom surface faces the second light emitting surface of the composite film, and the third light emitting surface is provided with a plurality of third strip structures; a light guide plate is arranged on one side of the first bottom surface, the light guide plate has a light incident surface and an upper surface and a lower surface opposite to each other, the upper surface faces the first bottom surface of the structural optical film; light emitting elements are arranged on one side of the light incident surface of the light guide plate, and the light emitting elements are arranged along the light source arrangement direction.

[0005] In one embodiment of the present invention, each of the first strip structures of the structured optical film has a first extending direction, and the first extending direction is not parallel to the light source arrangement direction.

[0006] In one embodiment of the present invention, a first extension angle is formed between the first extension direction and the light source arrangement direction, and the first extension angle is between 60 degrees and 120 degrees.

[0007] In one embodiment of the present invention, the second strip structure has a second extension direction, and a second extension angle is formed between the second extension direction and the first extension direction, and the second extension angle is between 80 degrees and 100 degrees.

[0008] In one embodiment of the present invention, the third strip structure has a third extension direction, and a third extension angle is formed between the third extension direction and the first extension direction, and the third extension angle is between 0 degrees and 10 degrees.

[0009] In one embodiment of the present invention, the first strip structure comprises two first side surfaces, a first structural angle is formed between the two first side surfaces, and the first structural angle is between 80 degrees and 110 degrees.

[0010] In an embodiment of the present invention, the first strip structure further includes a first top surface, the first top surface connects the two first side surfaces, and the first top surface is an arc surface.

[0011] In one embodiment of the present invention, a cross section of the first strip-shaped structure perpendicular to the first bottom surface is a semi-ellipse, or a side line of a cross section of the first strip-shaped structure perpendicular to the first bottom surface is a parabola.

[0012] In one embodiment of the present invention, when the cross section of the first strip structure perpendicular to the first bottom surface is a semi-ellipse, the edge of the cross section conforms to the ellipse circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

[0013] In one embodiment of the present invention, when the side line of the cross section of the first strip structure perpendicular to the first bottom surface is a parabola, it complies with the parabola formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

[0014] In one embodiment of the present invention, the first strip structure has a first strip structure height in a direction perpendicular to the first bottom surface, the optical diffusion structure has an optical diffusion structure height in a direction perpendicular to the first bottom surface, and the first strip structure height is greater than the optical diffusion structure height.

[0015] In one embodiment of the present invention, the optical diffusion structure is a coating layer including a plurality of diffusion particles.

[0016] In one embodiment of the present invention, the optical diffusion structure comprises a plurality of dot-shaped microstructures, each of which has a surface profile, and the surface profile is a spherical surface, an elliptical surface, or a free-form surface.

[0017] In one embodiment of the present invention, the surface profile mentioned above satisfies the following formula: Wherein S(x) is the surface profile of the point-like microstructure on the x-axis, k is the cone coefficient of the point-like microstructure, and k is greater than -1 and less than or equal to 0, R is the radius of curvature of the vertex of the point-like microstructure, and R is between 0.05 μm and 0.2 μm, x is the vertical projection position of the surface profile on the x-axis, and the microstructures have the same R value and k value.

[0018] In one embodiment of the present invention, the optical diffusion structure occupies 5% to 50% of the entire area of ​​the first bottom surface.

[0019] In one embodiment of the present invention, the structured optical film further comprises a buffer layer, the buffer layer is disposed on the first light emitting surface, and the material of the buffer layer is soft optical adhesive.

[0020] In one embodiment of the present invention, the light guide plate further includes a plurality of light guide microstructures, and the light guide microstructures are disposed on the lower surface.

[0021] In one embodiment of the present invention, the light-guiding microstructure has a backlight surface, and a backlight angle is formed between the backlight surface and the lower surface, and the backlight angle is between 1 degree and 6 degrees.

[0022] In one embodiment of the present invention, each of the above-mentioned light-guiding microstructures has a light-facing surface, and a light-facing angle is formed between the light-facing surface and the lower surface, and the angle of the light-facing angle is between 1 degree and 20 degrees.

[0023] In one embodiment of the present invention, the second strip structure includes two second side surfaces, a second structure angle is formed between the two second side surfaces, and the second structure angle is between 80 degrees and 110 degrees.

[0024] In one embodiment of the present invention, the second strip structure further includes a second top surface, the second top surface connects the two second side surfaces, and the second top surface is an arc surface.

[0025] In one embodiment of the present invention, the cross section of the second strip-shaped structure perpendicular to the second light emitting surface is semi-elliptical, or the side line of the cross section of the second strip-shaped structure perpendicular to the second light emitting surface is a parabola.

[0026] In one embodiment of the present invention, when the cross section of the second strip structure perpendicular to the second light-emitting surface is semi-elliptical, the edge of the cross section conforms to the elliptical circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

[0027] In one embodiment of the present invention, when the side line of the cross section of the second strip structure perpendicular to the second light emitting surface is a parabola, it complies with the parabola formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

[0028] In one embodiment of the present invention, the optical diffusion structure comprises a plurality of dot-shaped microstructures, each of which has a surface profile, and the surface profile is a spherical surface, an elliptical surface, or a free-form surface.

[0029] In one embodiment of the present invention, the surface profile of the aforementioned dot-shaped microstructures conforms to the following formula:

[0030] Wherein S(x) is the surface profile of the point-like microstructure on the x-axis, k is the cone coefficient of the point-like microstructure, and k is greater than -1 and less than or equal to 0, R is the radius of curvature of the vertex of the point-like microstructure, and R is between 0.005 μm and 0.05 μm, x is the vertical projection position of the surface profile on the x-axis, and the microstructures have the same R value and k value.

[0031] In one embodiment of the present invention, the diffusion structure layer is a coating layer including a plurality of diffusion particles.

[0032] In one embodiment of the present invention, the third strip structure includes two third side surfaces, a third structure angle is formed between the two third side surfaces, and the third structure angle is between 80 degrees and 110 degrees.

[0033] In an embodiment of the present invention, the third strip structure further includes a third top surface, the third top surface connects the two third side surfaces, and the third top surface is an arc surface.

[0034] In one embodiment of the present invention, a cross section of the third strip-shaped structure perpendicular to the third light emitting surface is semi-elliptical, or a side line of a cross section of the third strip-shaped structure perpendicular to the third light emitting surface is a parabola.

[0035] In one embodiment of the present invention, when the cross section of the third strip structure perpendicular to the third light-emitting surface is semi-elliptical, the edge of the cross section conforms to the elliptical circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

[0036] In one embodiment of the present invention, when the side line of the cross section of the third strip structure perpendicular to the third light emitting surface is a parabola, it complies with the parabola formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

[0037] In one embodiment of the present invention, the backlight module further comprises a reflective sheet and an optical film, wherein the reflective sheet is disposed on one side of the lower surface, and the optical film is disposed on a side of the structural optical film away from the light guide plate, wherein the optical film is selected from a diffuser or a reflective brightness enhancement film.

[0038] An embodiment of the present invention provides a structured optical film, comprising a structured optical body and a structured layer, wherein the structured optical body has a first light-emitting surface and a first bottom surface relative to each other; the structured layer is disposed on the first bottom surface, and the structured layer comprises a plurality of first strip structures and a plurality of optical diffusion structures, wherein the first strip structures are arranged at intervals, and the optical diffusion structures are disposed between the first strip structures.

[0039] In an embodiment of the present invention, each of the first strip structures comprises two first side surfaces, a first structural angle is formed between the two first side surfaces, and the first structural angle is between 80 degrees and 110 degrees.

[0040] In an embodiment of the present invention, each of the first strip structures further includes a first top surface, the first top surface connects the two first side surfaces, and the first top surface is an arc surface.

[0041] In an embodiment of the present invention, a cross section of each of the first strip structures perpendicular to the first bottom surface is a semi-ellipse, or a side line of a cross section of each of the first strip structures perpendicular to the first bottom surface is a parabola.

[0042] In one embodiment of the present invention, each of the first strip structures has a first strip structure height in a direction perpendicular to the first bottom surface, the optical diffusion structure has an optical diffusion structure height in a direction perpendicular to the first bottom surface, and the first strip structure height is greater than the optical diffusion structure height.

[0043] In one embodiment of the present invention, each of the optical diffusion structures is a coating layer including a plurality of diffusion particles.

[0044] In an embodiment of the present invention, each of the optical diffusion structures comprises a plurality of dot-shaped microstructures, and the dot-shaped microstructures have a surface profile, and the surface profile is a spherical surface, an elliptical surface, or a free-form surface.

[0045] The present invention uses a combination of a structured optical film and a light guide plate to converge the light viewing angle of the backlight module and improve the overall brightness. The backlight module includes a composite film and a brightness enhancement film, which can further improve the overall light output rate of the backlight module under the condition of convergence of the light viewing angle. Compared with the existing backlight module, the present invention meets the demand for more power saving at the same brightness.

[0046] In order to make the above and other purposes, features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 FIG. 1 is a schematic side view of a backlight module according to an embodiment of the present invention.

[0048] Figure 2 1 is a bottom view schematic diagram of a structured optical film according to an embodiment of the present invention.

[0049] Figure 3 1 is a side view schematic diagram of a first strip structure of a structured optical film according to an embodiment of the present invention.

[0050] Figure 4 FIG. 4 is a side view schematic diagram of a structured optical film according to another embodiment of the present invention.

[0051] Figure 5 FIG. 4 is a schematic diagram of a cross section of a first strip structure of a structured optical film according to another embodiment of the present invention in plane coordinates.

[0052] Figure 6FIG. 4 is a schematic diagram of a cross section of a first strip structure of a structured optical film according to another embodiment of the present invention in plane coordinates.

[0053] Figure 7 FIG. 1 is a schematic diagram of the appearance outline of the dot-shaped microstructure of the structured optical film according to an embodiment of the present invention.

[0054] Figure 8 FIG. 1 is a partial side view schematic diagram of a light guide plate according to an embodiment of the present invention.

[0055] Fig. 9 FIG. 4 is a partial side view schematic diagram of a light guide plate according to another embodiment of the present invention.

[0056] Fig.10 FIG. 4 is a partial side view schematic diagram of a light guide plate according to another embodiment of the present invention.

[0057] Fig.11 1 is a top view schematic diagram of a light guide microstructure of a light guide plate according to another embodiment of the present invention.

[0058] Fig.12 Schematic top view of a composite membrane according to an embodiment of the present invention.

[0059] Fig.13 Schematic side view of a composite membrane according to an embodiment of the present invention.

[0060] Fig.14 1 is a side view schematic diagram of a second strip structure of a composite membrane according to an embodiment of the present invention.

[0061] Fig.15 FIG. 1 is a schematic top view of a brightness enhancement film according to an embodiment of the present invention.

[0062] Fig.16 FIG. 1 is a side view schematic diagram of a second strip structure of a brightness enhancement film according to an embodiment of the present invention.

[0063] Fig.17 FIG. 4 is a side view of a backlight module according to another embodiment of the present invention.

[0064] Wherein, the reference numerals are:

[0065] 100, 100A: Backlight module

[0066] 10: Light guide plate

[0067] 12: Light-entering surface

[0068] 14: Upper surface

[0069] 16: Lower surface

[0070] 18, 18a, 18b: Light-guiding microstructure

[0071] 181a, 181b: Backlight side

[0072] 182a, 182b: light-facing side

[0073] 20: Light-emitting element

[0074] 30, 30': Structural optical film

[0075] 31: Structural Optical Body

[0076] 312: First light emitting surface

[0077] 314: First bottom surface

[0078] 32, 32': structural layer

[0079] 322, 322': first strip structure

[0080] 3221: First side

[0081] 3222: First top surface

[0082] 324, 324': Optical diffusion structure

[0083] 34: Buffer layer

[0084] 40: Composite film

[0085] 42: Second light-emitting surface

[0086] 422: Second strip structure

[0087] 4221: Second side

[0088] 4222: Second top surface

[0089] 44: Second bottom surface

[0090] 442: Anti-adsorption layer

[0091] 4421: Dot microstructure

[0092] 50: Brightening film

[0093] 52: The third light-emitting surface

[0094] 522: The third strip structure

[0095] 5221: The third side

[0096] 5222: The third top surface

[0097] 54: The third bottom surface

[0098] 60: Reflective sheet

[0099] 70: Optical film

[0100] α: first extension angle

[0101] β: first structural angle

[0102] γ: backlight angle

[0103] λ: light angle

[0104] δ: Second extension angle

[0105] ε: Second structure angle

[0106] θ: The third structural angle

[0107] μ: The third extension angle

[0108] D1: First extension direction

[0109] D2: Second extension direction

[0110] D3: The third extension direction

[0111] DS: Light source arrangement direction

[0112] H1: Optical diffusion structure height

[0113] H2: Height of the first strip structure

[0114] L1, L2: length

[0115] P: Spacing DETAILED DESCRIPTION

[0116] Figure 1 is a side view schematic diagram of a backlight module according to an embodiment of the present invention, Figure 2 FIG. 1 is a bottom view schematic diagram of a structured optical film according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the backlight module 100 includes a structured optical film 30, a composite film 40, a brightness enhancement film 50, a light guide plate 10, and a plurality of light-emitting elements 20. The structured optical film 30 includes a structured optical body 31 and a structure layer 32. The structured optical body 31 has a first light-emitting surface 312 and a first bottom surface 314 opposite to each other. The structure layer 32 is disposed on the first bottom surface 314. The structure layer 32 includes a plurality of first strip structures 322 and a plurality of optical diffusion structures 324. The first strip structures 322 are arranged at intervals, and each of the first strip structures 322 has a first extension direction D1 (indicated at Figure 2 ), the optical diffusion structure 324 is disposed between the first strip structures 322, which can make the light of the backlight module 100 uniform. The composite film 40 is disposed on one side of the first light emitting surface 312 of the structured optical film 30, and the composite film 40 has a second light emitting surface 42 and a second bottom surface 44 opposite to each other. The second bottom surface 44 faces the first light emitting surface 312 of the structured optical film 30, and the second light emitting surface 42 is provided with a plurality of second strip structures 422 (shown in FIG. Fig.12 and Fig.13 ), the second bottom surface 44 is provided with an anti-adsorption layer 442 (shown in Fig.13 The brightness enhancement film 50 is disposed on one side of the second light emitting surface 42 of the composite film 40. The brightness enhancement film 50 has an opposite third light emitting surface 52 and a third bottom surface 54. The third bottom surface 54 faces the second light emitting surface 42 of the composite film 40. The third light emitting surface 52 is provided with a plurality of third strip structures 522 (shown in FIG. Fig.15 ). The light guide plate 10 is disposed on one side of the first bottom surface 314, and the light guide plate 10 has a light incident surface 12 and an upper surface 14 and a lower surface 16 opposite thereto, and the upper surface 14 faces the first bottom surface 314 or the structural layer 32 of the structural optical film 30. The light emitting element 20 is disposed on one side of the light incident surface 12 of the light guide plate 10, and the light emitting element 20 is arranged along the light source arrangement direction DS, wherein the first extension direction D1 is not parallel to the light source arrangement direction DS. In one embodiment, there is a first extension angle α between the first extension direction D1 and the light source arrangement direction DS, and the angle of the first extension angle α is between 60 degrees and 120 degrees, for example but not limited to 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees, 90 degrees, 95 degrees, 100 degrees, 105 degrees, 110 degrees, 115 degrees and 120 degrees. If the prism structure and the pixel pitch of the liquid crystal display generate moiré interference, the moiré phenomenon can be adjusted in this angle range to improve it. In one embodiment, the first extension angle α is between 80 degrees and 100 degrees, which has the best brightness gain effect.

[0117] Continuing with the above description, Figure 3 is a side view schematic diagram of a first strip structure of a structured optical film according to an embodiment of the present invention. Figure 1 and Figure 3As shown, the first strip structure 322 protrudes from the first bottom surface 314, and each first strip structure 322 includes two first side surfaces 3221, and there is a first structural angle β between the two first side surfaces 3221, but it is not limited thereto. Specifically, the two first side surfaces 3221 can be connected to each other at their respective top edges, or the top edges of the two first side surfaces 3221 can be connected by a first top surface 3222, and the first top surface 3222 can be, for example, a curved surface, a single plane, or multiple planes, and the curved surface can be, for example but not limited to, an arc surface; the single plane can be parallel to the first bottom surface 314 or not parallel to the first bottom surface 314; the multiple planes are connected in sequence, and none of the multiple planes are parallel to the two first side surfaces 3221. When the two first side surfaces 3221 are connected to each other by their respective top edges, a first structural angle β is defined between the two first side surfaces 3221, and the first structural angle β is the top angle of the first strip structure 322; when the top edges of the two first side surfaces 3221 are connected by the first top surface 3222, the two first side surfaces 3221 extend in a direction away from the first bottom surface 314 and may intersect and define a first structural angle β, and the first structural angle β is a virtual image angle outside the first strip structure 322 or inside the first strip structure 322, wherein the first structural angle β is between 80 and 110 degrees, for example but not limited to 80, 82.5, 85, 87.5, 90, 92.5, 95, 97.5, 100, 102.5, 105, 107.5 and 110 degrees.

[0118] Further, Figure 3 For example, the first strip structure 322 shown in the figure has two first side surfaces 3221 connected by a first top surface 3222, that is, the first strip structure 322 further includes a first top surface 3222, and the first top surface 3222 connects the two first side surfaces 3221. Figure 3 As shown, when the first top surface 3222 is an arc surface, from the cross-section of the first strip structure 322 perpendicular to the first bottom surface 314, the first strip structure 322 is formed by at least the first bottom surface 314, two first side surfaces 3221 and a rounded corner (R angle), and the curvature radius R1 of the rounded corner is greater than 0μm and less than or equal to 20μm, for example but not limited to 1μm, 2.5μm, 5μm, 7.5μm, 10μm, 12.5μm, 15μm, 17.5μm and 20μm.

[0119] Continuing with the above description, Figure 4 is a side view schematic diagram of a structured optical film according to another embodiment of the present invention, Figure 5 is a schematic cross-sectional side view of a first strip structure of a structured optical film according to another embodiment of the present invention, Figure 6 FIG. 2 is a schematic cross-sectional side view of a first strip-shaped structure of a structured optical film according to another embodiment of the present invention. Figure 4As shown, the structural optical film 30' includes a structural optical body 31 and a structural layer 32', the structural layer 32' includes a plurality of first strip structures 322' and a plurality of optical diffusion structures 324', wherein the difference between the structural optical film 30' and the structural optical film 30 lies in that the cross-section of the first strip structure 322' and the form of the plurality of optical diffusion structures 324' in the structural layer 32' are respectively different from the cross-section of the first strip structure 322 and the form of the plurality of optical diffusion structures 324 in the structural layer 32 (explained in subsequent paragraphs).

[0120] Continuing with the above description, the first stripe structure 322 / 322' has a first stripe structure height H2 in a direction perpendicular to the first bottom surface 314, and the optical diffusion structure 324 / 324' has an optical diffusion structure height H1 in a direction perpendicular to the first bottom surface 314. The first stripe structure height H2 is greater than the optical diffusion structure height H1, so that the optical diffusion structure 324 does not directly contact the light guide plate 10 to prevent the light guide plate 10 from being worn. In one embodiment, the optical diffusion structure height H1 is between 5μm and 30μm, such as but not limited to 5μm, 10μm, 15μm, 20μm, 25μm and 30μm, and the first stripe structure height H2 is between 10μm and 50μm, such as but not limited to 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm and 50μm, or the first stripe structure height H2 is between 10μm and 50μm, such as but not limited to 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm and 50μm. A cross section of a strip structure 322 / 322' perpendicular to the first bottom surface 314 has a bottom edge, and a length L1 of the bottom edge is between 20 μm and 100 μm, such as but not limited to 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm and 100 μm. In one embodiment, Figure 1 As shown, the structured optical film 30 further includes a buffer layer 34, which is disposed on the first light emitting surface 312 of the structured optical body 31, and the second bottom surface 44 of the composite film 40 faces the buffer layer 34, wherein the material of the buffer layer 34 is, for example, soft optical glue, but not limited thereto.

[0121] See also Figures 3 to 5 Compared with the first strip structure 322 including two first side surfaces 3221, the cross section perpendicular to the first bottom surface 314 is a triangle or a triangle with rounded corners, and the cross section of the first strip structure 322' perpendicular to the first bottom surface 314 is, for example, a semi-ellipse, but not limited thereto, and the edge of the cross section conforms to the ellipse circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, wherein B is smaller than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, wherein y is greater than or equal to K or 0. In one embodiment, A is greater than 15μm and less than 30μm, such as but not limited to 15μm, 17.5μm, 20μm, 22.5μm, 25μm, 27.5μm and 30μm, and B is greater than 10μm and less than 25μm, such as but not limited to 10μm, 12.5μm, 15μm, 17.5μm, 20μm, 22.5μm and 25μm. Or, Figure 6 As shown, the edge of the cross section of the first strip structure 322' perpendicular to the first bottom surface 314 conforms to the parabola formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c (|c|) is greater than 0.1μm and less than 5μm.

[0122] The optical diffusion structure 324 between the two first strip structures 322 / 322 ′ may be a coating layer including a plurality of diffusion particles, or each optical diffusion structure 324 ′ may include a plurality of dot-shaped microstructures, but is not limited thereto. Figure 1 and Figure 2 The optical diffusion structure 324 is disposed between the two first strip structures 322 with a coating, wherein the coating contains a plurality of diffusion particles. In one embodiment, the coating may cover the first bottom surface 314 or cover the first bottom surface 314 and a plurality of dot-shaped microstructures.

[0123] Figure 7 FIG. 1 is a schematic diagram of the appearance of the dot-shaped microstructure of the structured optical film according to an embodiment of the present invention. Figure 4 and Figure 7 The optical diffusion structure 324' between the two first strip structures 322' includes a plurality of dot-shaped microstructures, wherein the dot-shaped microstructures have a surface profile, such as a spherical surface, an elliptical surface, or a free-form surface, but not limited thereto. The surface profile of the dot-shaped microstructures conforms to the formula: Wherein, S(x) is the surface profile of the dot-shaped microstructure on the x-axis, k is the cone coefficient of the dot-shaped microstructure, and k is greater than -1 and less than or equal to 0, R is the radius of curvature of the vertex of the dot-shaped microstructure, and R is between 0.05 μm and 0.2 μm, x is the vertical projection position of the surface profile on the x-axis, and the difference between the maximum and minimum values ​​of x is W, W is the width of the dot-shaped microstructure, W is between 5 μm and 50 μm, for example but not limited to 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm; each dot-shaped microstructure has the same R value and k value. In one embodiment, the optical diffusion structure 324 between the two first strip structures 322 occupies 5% to 50% of the overall area of ​​the first bottom surface 314.

[0124] In the above Figure 1 In the illustrated embodiment, the lower surface 16 of the light guide plate 10 is taken as an example of a simple plane, but the structure of the light guide plate 10 is not limited thereto. The light guide plate 10 is, for example, a highly directional light guide plate. Figure 8 is a partial side view schematic diagram of a light guide plate according to an embodiment of the present invention, Fig. 9 FIG. 1 is a partial side view of a light guide plate according to another embodiment of the present invention. Figures 8 to 10 The light guide plate 10 further includes a plurality of light guide microstructures 18 / 18a / 18b, but is not limited thereto. The light guide microstructures 18 / 18a / 18b are disposed on the lower surface 16, wherein, for example, there is a spacing P between two adjacent light guide microstructures 18. The light guide microstructures 18 / 18a / 18b may be arc-shaped structures, V-cut structures, or fly-cut structures, but are not limited thereto. In one embodiment, the lower surface 16 of the light guide plate 10 is provided with a plurality of laser dots.

[0125] like Figure 8 As shown in FIG. 1 , when the light-guiding microstructure 18 is an arc-shaped structure, the light-guiding microstructure 18 protrudes from the lower surface 16 and is arranged in an array. Fig. 9 As shown, when the light-guiding microstructure 18a is a V-cut structure, the light-guiding microstructure 18a protrudes from the lower surface 16, is arranged in an array, and has a backlight surface 181a and a light-facing surface 182a, wherein the light-facing surface 182a of each light-guiding microstructure 18a is between the light-emitting element 20 and the backlight surface 181a, and there is a backlight angle γ between the backlight surface 181a and the lower surface 16, and the angle of the backlight angle γ is between 1 degree and 6 degrees, for example but not limited to 1 degree, 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees and 6 degrees.

[0126] Fig.10 is a partial side view schematic diagram of a light guide plate according to another embodiment of the present invention, Fig.11 FIG. 1 is a top view schematic diagram of the optical microstructure of a light guide plate according to another embodiment of the present invention. Fig.10 and Fig.11 As shown, when the light guide microstructure 18b is a fly-cut structure, the light guide microstructure 18b is recessed in the lower surface 16 of the light guide plate 10. The light guide microstructure 18b includes a backlight surface 181b and a light-facing surface 182b, wherein the light-facing surface 182b of each light guide microstructure 18b is between the light emitting element 20 and the backlight surface 181b, and the backlight surface 181b and the light-facing surface 182b are curved surfaces. Fig.10 As shown, the farther away from the light emitting element 20, the larger the size of the light guide microstructure 18b is, but not limited to this. The cross section of the light guide microstructure 18b perpendicular to the lower surface 16 has a backlight ridgeline 1811 and a light-facing ridgeline 1821, wherein the backlight ridgeline 1811 is the most prominent surface edgeline of the backlight surface 181b in a side view, and there is a backlight angle γ between the backlight ridgeline 1811 and the lower surface 16, and the light-facing ridgeline 1821 is the most prominent surface edgeline of the light-facing surface 182b in a side view, and there is a light-facing angle λ between the light-facing ridgeline 1821 and the lower surface 16, and the light-facing angle λ is smaller than the backlight angle γ. In one embodiment, the incident light angle λ is between 1 degree and 20 degrees, such as but not limited to 1 degree, 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees and 20 degrees. In an embodiment not shown, the farther away from the light emitting element 20, the smaller the spacing P between adjacent light guide microstructures 18 / 18a / 18b, that is, the light guide microstructures 18 / 18a / 18b are arranged more closely. In one embodiment, each light-guiding microstructure 18 / 18a / 18b has a bottom edge in a cross section perpendicular to the lower surface 16, and the length L2 of the bottom edge is between 20 and 100 μm, for example but not limited to 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm and 100 μm.

[0127] Fig.12 is a schematic top view of a composite membrane according to an embodiment of the present invention, Fig.13 Schematic diagram of the side view of the composite membrane of one embodiment of the present invention. Figure 1 In the illustrated embodiment, the second light emitting surface 42 and the second bottom surface 44 of the composite film 40 are exemplified as planes, but the structure of the composite film 40 is not limited thereto. Fig.12 and Fig.13As shown, the second strip structure 422 of the composite film 40 is protrudingly disposed on the second light emitting surface 42, and the anti-adsorption layer 442 is disposed on the second bottom surface 44. The second strip structure 422 has a second extension direction D2, and a second extension angle δ is formed between the second extension direction D2 and the first extension direction D1, but is not limited thereto. In one embodiment, the second extension angle δ is between 80 degrees and 100 degrees, for example but not limited to 80 degrees, 81 degrees, 82 degrees, 83 degrees, 84 degrees, 85 degrees, 86 degrees, 87 degrees, 88 degrees, 89 degrees, 90 degrees, 91 degrees, 92 degrees, 93 degrees, 94 degrees, 95 degrees, 96 degrees, 97 degrees, 98 degrees, 99 degrees and 100 degrees.

[0128] Fig.14 FIG. 1 is a side view schematic diagram of a second strip structure of a composite membrane according to an embodiment of the present invention. Figure 12 to Figure 14 As shown, the second strip structure 422 is similar to the first strip structure 322. Each second strip structure 422 includes two second side surfaces 4221, and a second structure angle ε is formed between the two second side surfaces 4221, but is not limited thereto. Specifically, the two second side surfaces 4221 can be connected to each other at their respective top edges, or the top edges of the two second side surfaces 4221 can be connected by a second top surface 4222, and each second strip structure 422 is closely arranged with adjacent second strip structures 422. When the second strip structure 422 has a second top surface 4222, the second top surface 4222 can be, for example, a curved surface, a single plane, or multiple planes, and the curved surface can include but is not limited to an arc surface; the single plane can be parallel to the second light emitting surface 42 or not parallel to the second light emitting surface 42; the multiple planes are connected in sequence, and none of the multiple planes are parallel to the two second side surfaces 4221. When the two second side surfaces 4221 are connected to each other by their respective top edges, there is a second structural angle ε between the two second side surfaces 4221, and the second structural angle ε is the top angle of the second strip structure 422; when the top edges of the two second side surfaces 4221 are connected by a second top surface 4222, the two second side surfaces 4221 extend along a direction away from the second light emitting surface 42 and may intersect and have a fifth angle ε, and the second structural angle ε is the virtual image angle outside the second strip structure 422 or inside the second strip structure 422, wherein the second structural angle ε is between 80 degrees and 110 degrees, for example but not limited to 80 degrees, 82.5 degrees, 85 degrees, 87.5 degrees, 90 degrees, 92.5 degrees, 95 degrees, 97.5 degrees, 100 degrees, 102.5 degrees, 105 degrees, 107.5 degrees and 110 degrees.

[0129] Further, Fig.14Take the second strip structure 422 as an example, wherein the two second side surfaces 4221 are further connected by a second top surface 4222, that is, the second strip structure 422 further includes a second top surface 4222, and the second top surface 4222 connects the two second side surfaces 4221. When the second top surface 4222 is an arc surface, from the perspective of the cross section of the second strip structure 422 perpendicular to the second light emitting surface 42, the second strip structure 422 is at least formed by the second light emitting surface 42, the two second side surfaces 4221 and a rounded corner (R corner), wherein the definition of the rounded corner can refer to the rounded corner of the cross section of the first strip structure 322, which will not be repeated here.

[0130] Alternatively, the second strip structure 422 is similar to the first strip structure 322'. Figure 6 As shown, when the second strip structure 422 is similar to the first strip structure 322', the cross-section of the second strip structure 422 perpendicular to the second light-emitting surface 42 is, for example, a semi-ellipse, or the edge of the cross-section of the second strip structure 422 perpendicular to the second light-emitting surface 42 is a parabola, but is not limited to this. For the definitions of the semi-ellipse and the parabola, please refer to the description of the first strip structure 322', which will not be repeated here.

[0131] The anti-adsorption layer 442 includes a plurality of dot-shaped microstructures, but is not limited thereto. The dot-shaped microstructures have a surface profile, such as a spherical surface, an elliptical surface, or a free-form surface, but is not limited thereto. The surface profile of the dot-shaped microstructures conforms to the formula: Wherein, S(x) is the surface profile of the dot-like microstructure on the x-axis, k is the cone coefficient of the dot-like microstructure, and k is greater than -1 and less than or equal to 0, R is the radius of curvature of the vertex of the dot-like microstructure, and R is between 0.005 μm and 0.05 μm, for example but not limited to 0.01 μm, 0.015 μm, 0.02 μm, 0.025 μm, 0.03 μm, 0.035 μm, 0.04 μm, 0.045 μm and 0.05 μm, x is the vertical projection position of the surface profile on the x-axis, The difference between the maximum value and the minimum value of x is W, W is the width of the dot microstructure, W is between 10 μm and 200 μm, such as but not limited to 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm and 200 μm; each dot microstructure has the same R value and k value. In an embodiment not shown, the height of the dot microstructure of the anti-adsorption layer 442 is between 10 μm and 50 μm, such as but not limited to 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm and 50 μm.

[0132] Furthermore, the anti-adsorption layer 442 may be a coating layer including a plurality of diffusion particles, the coating layer covers the second bottom surface 44 or covers the second bottom surface 44 and a plurality of dot-shaped microstructures, wherein the anti-adsorption layer 442 may increase the anti-static adsorption effect. In one embodiment, the anti-adsorption layer 442 is disposed between the composite film 40 and the buffer layer 34, wherein the buffer layer 34 may reduce the wear between the dot-shaped microstructures in the anti-adsorption layer 442 or the diffusion particles in the coating layer and the structured optical film, thereby reducing the wear of the structured optical film, thereby extending the service life of the structured optical film.

[0133] In the above Figure 1 In the embodiment shown, the third light emitting surface 52 of the brightness enhancement film 50 is a simple plane as an example, but the structure of the brightness enhancement film 50 is not limited thereto. The third bottom surface 54 faces the second light emitting surface 42 or the second strip structure 422 of the composite film 40 . Fig.15 FIG. 1 is a schematic top view of a brightness enhancement film according to an embodiment of the present invention. Fig.15 As shown, the third strip structure 522 of the brightness enhancement film 50 is protruded from the third light emitting surface 52 and has a third extension direction D3. The third extension direction D3 and the first extension direction D1 have a third extension angle μ, which is between 0 degrees and 10 degrees.

[0134] Fig.16 FIG. 1 is a side view schematic diagram of a third strip structure of a brightness enhancement film according to an embodiment of the present invention. Fig.16As shown, the third strip structure 522 is similar to the first strip structure 322, and the third strip structure 522 includes two third side surfaces 5221, and a third structure angle θ is formed between the two third side surfaces 5221. Specifically, the two third side surfaces 5221 can be connected to each other at their respective top edges, or the top edges of the two third side surfaces 5221 can be connected by a third top surface 5222, and each third strip structure 522 is closely arranged with the adjacent third strip structures 522. The third top surface 5222 can be, for example, a curved surface, a single plane, or multiple planes, and the curved surface can include but is not limited to an arc surface; the single plane can be parallel to the third light emitting surface 52 or not parallel to the third light emitting surface 52; the multiple planes are connected in sequence, and none of the multiple planes are parallel to the two third side surfaces 5221. When the two third side surfaces 5221 are connected to each other by their respective top edges, there is a third structural angle θ between the two third side surfaces 5221, and the third structural angle θ is the top angle of the third strip structure 522; when the top edges of the two third side surfaces 5221 are connected by a third top surface 5222, the two third side surfaces 5221 extend in a direction away from the third light emitting surface 52 and may intersect and have a third structural angle θ, and the third structural angle θ is the virtual image angle outside the third strip structure 522 or inside the third strip structure 522, wherein the third structural angle θ is between 80 degrees and 110 degrees, for example but not limited to 80 degrees, 82.5 degrees, 85 degrees, 87.5 degrees, 90 degrees, 92.5 degrees, 95 degrees, 97.5 degrees, 100 degrees, 102.5 degrees, 105 degrees, 107.5 degrees and 110 degrees.

[0135] When the two third side surfaces 5221 are connected by a curved surface, that is, the third strip structure 522 includes a third top surface 5222, and the third top surface 5222 connects the two third side surfaces 5221, the third top surface 5222 is an arc surface, but is not limited thereto. Fig.16 As shown, the cross section of the third strip structure 522 is formed by at least the third light emitting surface 52, two third side surfaces 5221 and a rounded corner (R corner), wherein the definition of the rounded corner has been referred to the rounded corner of the cross section of the first strip structure 322 and will not be repeated here.

[0136] Alternatively, the third strip structure 522 is similar to the first strip structure 322'. Figure 6 As shown, when the third strip structure 522 is similar to the first strip structure 322', the cross-section of the third strip structure 422 perpendicular to the third light-emitting surface 52 is, for example, a semi-ellipse, or the edge of the cross-section of the third strip structure 522 perpendicular to the third light-emitting surface 52 is a parabola, but is not limited to this. For the definitions of the semi-ellipse and the parabola, please refer to the description of the first strip structure 322', which will not be repeated here.

[0137] Fig.17 FIG. 1 is a side view schematic diagram of a backlight module according to another embodiment of the present invention. Fig.14As shown, the backlight module 100A includes a structured optical film 30, a light guide plate 10, a plurality of light emitting elements 20, a composite film 40, a brightness enhancement film 50, a reflective sheet 60 and at least one optical film sheet 70, wherein the difference between the backlight module 100A and the backlight module 100 is that the backlight module 100A further includes a reflective sheet 60 and at least one optical film sheet 70. The reflective sheet 60 is disposed on a side of the light guide plate 10 away from the structured optical film 30, that is, disposed on a side of the lower surface 16. The optical film sheet 70 is disposed on a side of the structured optical film 30 away from the light guide plate 10, wherein the optical film sheet 70 can be disposed between the structured optical film 30 and the composite film 40, or between the composite film 40 and the brightness enhancement film 50, or on a side of the brightness enhancement film 50 away from the structured optical film 30. In one embodiment, the optical film sheet 70 is selected from a diffuser or a reflective brightness enhancement film, and the reflective sheet 60 is a white reflective sheet or a silver reflective sheet.

[0138] Generally speaking, the traditional high-brightness backlight module uses a silver reflector, which can make the overall light output of the high-brightness backlight module higher than that of the backlight module using a white reflector. However, the cost of the silver reflector is higher than that of the white reflector, and the concentration of the light viewing angle is limited. The present invention adopts a structural optical film including a first strip structure and an optical diffusion structure to improve the uniformity of light after penetration and reduce the wear between the light guide plate and the structural optical film. The first strip structure extends in a first extension direction to avoid moiré interference with the pixel spacing of the liquid crystal display, while maintaining the brightness gain effect. When the backlight module of the present invention includes a highly directional light guide plate, the light viewing angle of the backlight module can be converged and the overall light output brightness can be improved. Combined with the composite film and the brightness enhancement film, the overall light output rate of the backlight module can be further improved when the light viewing angle converges. In other words, when the backlight module of the present invention uses a white reflector, the overall light output brightness can be comparable to the overall light output brightness of the traditional high-brightness backlight module using a silver reflector, and the light viewing angle is more concentrated, thereby achieving the need to save more power at the same brightness. If the reflector of the backlight module of the present invention is a silver reflector, the overall light output brightness can be better than that of a conventional high-brightness backlight module, that is, a better visual effect can be obtained under the same amount of electricity.

[0139] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A backlight module, characterized in that: Include: A structured optical film, comprising a structured optical body and a structured layer, wherein the structured optical body has a first light-emitting surface and a first bottom surface opposite to each other, the structured layer is disposed on the first bottom surface, the structured layer comprises a plurality of first strip structures and a plurality of optical diffusion structures, the first strip structures are arranged at intervals, and the optical diffusion structures are disposed between the first strip structures; A composite film is disposed on one side of the first light emitting surface of the structural optical film, the composite film has a second light emitting surface and a second bottom surface opposite to each other, the second bottom surface faces the first light emitting surface of the structural optical film, the second light emitting surface is provided with a plurality of second strip structures, and the second bottom surface is provided with an anti-adsorption layer; a brightness enhancement film, disposed on one side of the second light emitting surface of the composite film, the brightness enhancement film having a third light emitting surface and a third bottom surface opposite to each other, the third bottom surface facing the second light emitting surface of the composite film, and the third light emitting surface being provided with a plurality of third strip structures; a light guide plate disposed on one side of the first bottom surface, the light guide plate having a light incident surface and an upper surface and a lower surface opposite thereto, the upper surface facing the first bottom surface of the structural optical film; and A plurality of light emitting elements are arranged on one side of the light incident surface of the light guide plate, and the light emitting elements are arranged along a light source arrangement direction.

2. The backlight module according to claim 1, wherein: Each of the first strip structures of the structured optical film has a first extension direction, and the first extension direction is not parallel to the light source arrangement direction.

3. The backlight module according to claim 2, wherein: A first extension angle is formed between the first extension direction and the light source arrangement direction, and the first extension angle is between 60 degrees and 120 degrees.

4. The backlight module according to claim 2, wherein: Each of the second strip structures has a second extension direction. A second extension angle is formed between the second extension direction and the first extension direction. The second extension angle is between 80 degrees and 100 degrees.

5. The backlight module according to claim 2, wherein: Each of the third strip structures has a third extension direction. A third extension angle is formed between the third extension direction and the first extension direction. The third extension angle is between 0 degrees and 10 degrees.

6. The backlight module according to claim 1, wherein: Each of the first strip structures includes two first side surfaces. A first structural angle is formed between the two first side surfaces. The angle of the first structural angle is between 80 degrees and 110 degrees.

7. The backlight module according to claim 6, wherein: Each of the first strip structures further includes a first top surface, the first top surface connects the two first side surfaces, and the first top surface is an arc surface.

8. The backlight module according to claim 1, wherein: A cross section of each of the first strip-shaped structures perpendicular to the first bottom surface is a semi-ellipse, or a side line of a cross section of each of the first strip-shaped structures perpendicular to the first bottom surface is a parabola.

9. The backlight module according to claim 8, wherein: When the cross-section of the first strip-shaped structures perpendicular to the first bottom surface is a semi-ellipse, the edge of the cross-section conforms to the ellipse circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

10. The backlight module according to claim 8, wherein: When the side lines of the cross sections of the first strip structures perpendicular to the first bottom surface are parabolas, they meet the parabola formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

11. The backlight module according to claim 1, wherein: Each of the first strip structures has a first strip structure height in a direction perpendicular to the first bottom surface, and each of the optical diffusion structures has an optical diffusion structure height in a direction perpendicular to the first bottom surface. The first strip structure height is greater than the optical diffusion structure height.

12. The backlight module according to claim 1, wherein: Each of the optical diffusion structures is a coating layer including a plurality of diffusion particles.

13. The backlight module according to claim 1, wherein: Each of the optical diffusion structures includes a plurality of dot-shaped microstructures, and each of the dot-shaped microstructures has a surface profile, which is a spherical surface, an elliptical surface, or a free-form surface.

14. The backlight module according to claim 13, wherein: The surface profile conforms to the following formula: Wherein, S(x) is the surface profile of each of the dot-shaped microstructures on an x-axis, k is a cone coefficient of each of the dot-shaped microstructures, and k is greater than -1 and less than or equal to 0, R is a radius of curvature of a vertex of each of the dot-shaped microstructures, and R is between 0.05 μm and 0.2 μm, x is the vertical projection position of the surface profile on the x-axis, and the dot-shaped microstructures have the same R value and k value.

15. The backlight module according to claim 1, wherein: The optical diffusion structures occupy 5% to 50% of the overall area of ​​the first bottom surface.

16. The backlight module according to claim 1, wherein: The structured optical film further comprises a buffer layer, which is arranged on the first light-emitting surface and is made of soft optical glue.

17. The backlight module according to claim 1, wherein: The light guide plate further includes a plurality of light guide microstructures, and the light guide microstructures are arranged on the lower surface.

18. The backlight module according to claim 17, wherein: Each of the light-guiding microstructures has a backlight surface. A backlight angle is formed between the backlight surface and the lower surface. The backlight angle is between 1 degree and 6 degrees.

19. The backlight module according to claim 17, wherein: Each of the light-guiding microstructures has a light-facing surface which is a curved surface. Each of the light-guiding microstructures has a light-facing ridge line in a cross section perpendicular to the lower surface. There is a light-facing angle between the light-facing ridge line and the lower surface, and the angle of the light-facing angle is between 1 degree and 20 degrees.

20. The backlight module according to claim 1, wherein: Each of the second strip structures includes two second side surfaces. A second structure angle is defined between the two second side surfaces. The second structure angle is between 80 degrees and 110 degrees.

21. The backlight module according to claim 20, wherein: Each of the second strip structures further includes a second top surface, the second top surface connects the two second side surfaces, and the second top surface is an arc surface.

22. The backlight module according to claim 1, wherein: The cross section of each of the second strip-shaped structures perpendicular to the second light-emitting surface is semi-elliptical, or the side line of the cross section of each of the second strip-shaped structures perpendicular to the second light-emitting surface is a parabola.

23. The backlight module according to claim 22, wherein: When the cross-section of the second strip-shaped structures perpendicular to the second light-emitting surface is semi-elliptical, the edge of the cross-section conforms to the elliptical circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

24. The backlight module according to claim 22, wherein: When the side lines of the cross sections of the second strip structures perpendicular to the second light-emitting surface are parabolas, they conform to the parabolic formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

25. The backlight module according to claim 1, wherein: The anti-adsorption layer includes a plurality of dot-shaped microstructures, each of which has a surface profile, and the surface profile is a spherical surface, an elliptical surface, or a free-form surface.

26. The backlight module according to claim 25, wherein: The surface profile conforms to the following formula: Wherein, S(x) is the surface profile of each of the dot-shaped microstructures on an x-axis, k is a cone coefficient of each of the dot-shaped microstructures, and k is greater than -1 and less than or equal to 0, R is a radius of curvature of a vertex of each of the dot-shaped microstructures, and R is between 0.005 μm and 0.05 μm, and x is the vertical projection position of the surface profile on the x-axis, and the microstructures have the same R value and k value.

27. The backlight module according to claim 1, wherein: The anti-adsorption layer is a coating layer comprising a plurality of diffusion particles.

28. The backlight module according to claim 1, wherein: Each of the third strip structures includes two third side surfaces. A third structure angle is defined between the two third side surfaces. The third structure angle is between 80 degrees and 110 degrees.

29. The backlight module according to claim 28, wherein: Each of the third strip structures further includes a third top surface, the third top surface connects the two third side surfaces, and the third top surface is an arc surface.

30. The backlight module according to claim 1, wherein: A cross section of each of the third strip-shaped structures perpendicular to the third light-emitting surface is semi-elliptical, or a side line of a cross section of each of the third strip-shaped structures perpendicular to the third light-emitting surface is a parabola.

31. The backlight module according to claim 30, wherein: When the cross-section of the third strip-shaped structures perpendicular to the third light-emitting surface is semi-elliptical, the edge of the cross-section conforms to the elliptical circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

32. The backlight module according to claim 30, wherein: When the side lines of the cross sections of the second strip structures perpendicular to the second light-emitting surface are parabolas, they conform to the parabolic formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

33. The backlight module as claimed in claim 1, further comprising a reflective sheet and at least one optical film sheet, wherein the reflective sheet is disposed on one side of the lower surface, and the at least one optical film sheet is disposed on a side of the structured optical film away from the light guide plate, wherein: The optical film is selected from a diffusion film or a reflective brightness enhancement film.

34. A structural optical film, characterized in that: Include A structural optical body having a first light emitting surface and a first bottom surface opposite to each other; and A structural layer is disposed on the first bottom surface. The structural layer includes a plurality of first strip structures and a plurality of optical diffusion structures. The first strip structures are arranged at intervals, and the optical diffusion structures are disposed between the first strip structures.

35. The structured optical film of claim 34, wherein: Each of the first strip structures includes two first side surfaces. A first structural angle is formed between the two first side surfaces. The angle of the first structural angle is between 80 degrees and 110 degrees.

36. The structured optical film of claim 35, wherein: Each of the first strip structures further includes a first top surface, the first top surface connects the two first side surfaces, and the first top surface is an arc surface.

37. The structured optical film of claim 34, wherein: A cross section of each of the first strip-shaped structures perpendicular to the first bottom surface is a semi-ellipse, or a side line of a cross section of each of the first strip-shaped structures perpendicular to the first bottom surface is a parabola.

38. The structured optical film of claim 37, wherein: When the cross-section of the first strip-shaped structures perpendicular to the first bottom surface is a semi-ellipse, the edge of the cross-section conforms to the ellipse circumference formula Wherein, A is the length of the semi-major axis, B is the length of the semi-minor axis, where B is less than A, H is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the x-axis, K is the vertical projection position of the center of the intersection of the major axis and the minor axis of the ellipse on the XY plane on the y-axis, x is the vertical projection position of any point on the circumference of the ellipse on the x-axis, y is the vertical projection position of any point on the circumference of the ellipse on the y-axis, where y is greater than or equal to K or 0.

39. The structured optical film of claim 37, wherein: When the side lines of the cross sections of the first strip structures perpendicular to the first bottom surface are parabolas, they meet the parabola formula (xh): 2 =4c(yk), wherein the axis of symmetry of the parabola on the XY plane is x=h, the focus is (h, k+c), and h is the vertical projection position of the highest point of the parabola on the XY plane on the x-axis, k is the vertical projection position of the highest point (vertex) of the parabola on the XY plane on the y-axis, y is greater than or equal to 0, c is the focal length, and the absolute value of c is greater than 0.1μm and less than 5μm.

40. The structured optical film of claim 34, wherein: Each of the first strip structures has a first strip structure height in a direction perpendicular to the first bottom surface, and each of the optical diffusion structures has an optical diffusion structure height in a direction perpendicular to the first bottom surface. The first strip structure height is greater than the optical diffusion structure height.

41. The structured optical film of claim 34, wherein: Each of the optical diffusion structures is a coating layer including a plurality of diffusion particles.

42. The structured optical film of claim 34, wherein: Each of the optical diffusion structures includes a plurality of dot-shaped microstructures, and each of the dot-shaped microstructures has a surface profile, which is a spherical surface, an elliptical surface, or a free-form surface.

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