Optical films and light-emitting modules using them

Abstract

This invention discloses an optical film and a light-emitting module using the same. The light-emitting module includes a light-emitting component and an optical film. The light-emitting component includes a substrate and a plurality of light-emitting units disposed on the substrate. The optical film is disposed on the light-emitting units and includes a substrate layer and a first optical structure. The first optical structure is disposed on the substrate layer and includes a first high-refractive-index layer and a first low-refractive-index layer. The first high-refractive-index layer is located between the light-emitting component and the first low-refractive-index layer. The interface between the first high-refractive-index layer and the first low-refractive-index layer includes a plurality of first inclined surfaces, and each first inclined surface is inclined relative to the thickness direction of the substrate layer. The optical film has a good diffusion effect for point light sources and can be applied in the light-emitting module of a display device.

Description

Technical Field

[0001] This invention relates to an optical film and a light-emitting module using the same, and more particularly to an optical film used in a display device and a light-emitting module using the same. Background Technology

[0002] Currently, backlight modules are widely used in display devices, especially liquid crystal displays (LCDs), to provide the light source needed for displaying images. Existing backlight modules typically include a light-emitting component and optical components mounted on the backlight. The optical components are used to adjust the light beam generated by the light-emitting component to ensure uniform brightness distribution.

[0003] The light-emitting components in backlight modules typically employ multiple light-emitting diodes (LEDs) or mini LEDs arranged in an array, producing a concentrated and highly directional light beam. Therefore, to convert the point light source array generated by the light-emitting components into a surface light source, the optical components usually utilize numerous optical films, such as light guides, diffusers, and brightness enhancement films, to diffuse the light beam generated by the light-emitting components across the entire display area using physical phenomena such as light refraction, reflection, or scattering. However, this limits the potential for further reduction in the overall thickness of the optical components. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a light-emitting module and an optical film using the same, addressing the shortcomings of existing technologies. The optical film has a good diffusion effect on point light sources and can be applied in the light-emitting modules of display devices.

[0005] To solve the aforementioned technical problems, the present invention provides a light-emitting module. The light-emitting module includes a light-emitting component and an optical film. The light-emitting component includes a substrate and multiple light-emitting units disposed on the substrate. The optical film is disposed on the light-emitting units and includes a substrate layer and a first optical structure. The first optical structure is disposed on the substrate layer and includes a first high-refractive-index layer and a first low-refractive-index layer. The first high-refractive-index layer is located between the light-emitting component and the first low-refractive-index layer. The interface between the first high-refractive-index layer and the first low-refractive-index layer includes multiple first inclined surfaces, and each first inclined surface is inclined relative to the thickness direction of the substrate layer. Two connected first inclined surfaces together form a first included angle, and the first included angle, the refractive index of the first high-refractive-index layer, and the refractive index of the first low-refractive-index layer satisfy the following relationship: θ1≦(180-2*arcsin(n10 / n11)); where θ1 is the first included angle, n11 is the refractive index of the first high-refractive-index layer, and n10 is the refractive index of the first low-refractive-index layer.

[0006] Furthermore, the first high refractive index layer has a light-incident surface facing the light-emitting component, the light-incident surface being a flat surface, and the ratio between the refractive index of the first low refractive index layer and the refractive index of the first high refractive index layer ranging from 0.85 to 0.97.

[0007] Furthermore, the optical film further includes a second optical structure, wherein the first optical structure and the second optical structure are located on opposite sides of the substrate layer, and the refractive index of the second optical structure is greater than that of air.

[0008] Furthermore, a first angle is formed between two connected first inclined surfaces, and the surface of the second optical structure includes a plurality of second inclined surfaces, and a second angle is formed between two connected second inclined surfaces, the second angle being greater than or equal to the first angle.

[0009] Furthermore, at least one of the second optical structure, the first high refractive index layer, and the first low refractive index layer has a plurality of bubbles distributed therein, and at least 90% of the bubbles have a bubble diameter of less than 10 μm.

[0010] Furthermore, at least one of the first low-refractive-index layer or the first high-refractive-index layer has a plurality of bubbles and a plurality of nanoparticles, at least one nanoparticle is combined with one of the bubbles, and the average particle size of the plurality of nanoparticles does not exceed 100 nm.

[0011] Furthermore, the first low-refractive-index layer has multiple recessed microstructures, and the first high-refractive-index layer fills the multiple recessed microstructures to form multiple protruding microstructures, and the shape of each protruding microstructure matches the shape of the recessed microstructure.

[0012] Furthermore, each concave microstructure is a concave pyramid microstructure, and each convex microstructure is a convex pyramid microstructure.

[0013] Furthermore, the first high refractive index layer has a light-incident surface, and the light-incident surface has multiple recessed microstructures.

[0014] Furthermore, the optical film further includes a second optical structure, wherein the first optical structure and the second optical structure are located on the light-incident side and the light-outcident side of the substrate layer, respectively. The second optical structure includes a second high refractive index layer and a second low refractive index layer, wherein the second high refractive index layer is located between the second low refractive index layer and the light-emitting component, and the second low refractive index layer has an outer surface with a plurality of recessed microstructures.

[0015] To address the aforementioned technical problems, the present invention provides an optical film. The optical film includes a substrate layer and a first optical structure. The first optical structure is disposed on a light-incident side of the substrate layer and includes a first high-refractive-index layer and a first low-refractive-index layer. The first low-refractive-index layer is located between the first high-refractive-index layer and the substrate layer. The interface between the first high-refractive-index layer and the first low-refractive-index layer includes a plurality of first inclined surfaces, each of which is inclined relative to the thickness direction of the substrate layer. The ratio between the refractive index of the first low-refractive-index layer and the refractive index of the first high-refractive-index layer ranges from 0.85 to 0.97.

[0016] Furthermore, the first low-refractive-index layer has multiple recessed microstructures, and the first high-refractive-index layer fills the multiple recessed microstructures to form multiple protruding microstructures, and the shape of each protruding microstructure matches the shape of the recessed microstructure.

[0017] Furthermore, each concave microstructure is a concave pyramid microstructure, and each convex microstructure is a convex pyramid microstructure. The convex pyramid microstructure includes at least one triangular inclined plane, and the vertex angle of the at least one triangular inclined plane, the refractive index of the first high refractive index layer, and the refractive index of the first low refractive index layer satisfy the following relationship: θ≦(180-2*arcsin(n10 / n11); where θ is the vertex angle, n11 is the refractive index of the first high refractive index layer, and n10 is the refractive index of the first low refractive index layer.

[0018] Furthermore, the optical film further includes: a second optical structure located on the light-emitting side of the substrate layer, the second optical structure including a second high refractive index layer and a second low refractive index layer, wherein the second high refractive index layer is located between the second low refractive index layer and the substrate layer, wherein the second high refractive index layer includes a plurality of recessed microstructures, and the second low refractive index layer fills the plurality of recessed microstructures of the second high refractive index layer to form a plurality of protruding microstructures.

[0019] Furthermore, the first high refractive index layer has a light-incident surface with multiple recessed microstructures, and the second low refractive index layer has an outer surface with multiple recessed microstructures.

[0020] One of the beneficial effects of the present invention is that the optical film and the light-emitting module using the optical film provided by the present invention can diffuse the light beam generated by the light-emitting component through the technical solutions of "the optical film is disposed on multiple light-emitting units and includes a substrate layer and a first optical structure", "the first optical structure includes a first high refractive index layer and a first low refractive index layer, the first high refractive index layer is located between the light-emitting component and the first low refractive index layer", and "the interface between the first high refractive index layer and the first low refractive index layer includes multiple first inclined surfaces, and each first inclined surface is inclined relative to the thickness direction of the substrate layer".

[0021] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0022] Figure 1 This is a partial side view of the light-emitting module according to the first embodiment of the present invention.

[0023] Figure 2A for Figure 1 A magnified view of a portion of region IIA.

[0024] Figure 2B for Figure 1 A magnified view of a portion of region IIA.

[0025] Figure 3 This is a partial three-dimensional exploded view of the first optical structure according to an embodiment of the present invention.

[0026] Figure 4 This is a partially enlarged schematic diagram of the light-emitting module according to another embodiment of the present invention.

[0027] Figure 5 This is a partial side view of the light-emitting module according to the second embodiment of the present invention.

[0028] Figure 6 for Figure 5 A magnified view of region VI in the diagram.

[0029] Figure 7 This is a partial three-dimensional exploded view of an optical film according to an embodiment of the present invention.

[0030] Figure 8 This is a partial three-dimensional exploded view of the optical film according to another embodiment of the present invention.

[0031] Figure 9 This is a partially enlarged schematic diagram of the light-emitting module according to another embodiment of the present invention.

[0032] Figure 10 This is a partially enlarged schematic diagram of the light-emitting module according to another embodiment of the present invention.

[0033] Figure 11 This is a partially enlarged schematic diagram of the light-emitting module according to another embodiment of the present invention.

[0034] Figure 12 This is a partial side view of the light-emitting module according to the third embodiment of the present invention.

[0035] Figure 13 This is a partial side view of the light-emitting module according to the fourth embodiment of the present invention.

[0036] Figure 14 This is a partial side view of the light-emitting module according to the fifth embodiment of the present invention.

[0037] Figure 15 This is a partial side view of the light-emitting module according to the sixth embodiment of the present invention.

[0038] Figure 16 for Figure 15 A partial three-dimensional exploded view of the optical film.

[0039] Figure 17 This is a partial side view of the light-emitting module according to the seventh embodiment of the present invention.

[0040] Figure 18 This is a partial side view of the light-emitting module according to the eighth embodiment of the present invention. Detailed Implementation

[0041] The following specific examples illustrate the embodiments of the "optical film and light-emitting module using it" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated beforehand. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention.

[0042] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0043] Please refer to Figure 1 and Figure 2A , Figure 1 This is a partial side view of the light-emitting module according to the first embodiment of the present invention, and Figure 2A for Figure 1 A magnified view of region IIA in the diagram. The light-emitting module Z1 can be used in the backlight module of a display device, such as a direct-lit backlight module, to uniformly diffuse the light source to a specific display area.

[0044] The light-emitting module Z1 includes a light-emitting component 1 and an optical film 2A. The light-emitting component 1 includes a substrate 10 and a plurality of light-emitting units 11 disposed on the substrate 10. The substrate 10 has a reflective surface 101s for reflecting light beams, and the plurality of light-emitting units 11 are disposed on the reflective surface 101s. Further, in this embodiment, the substrate 10 includes a base plate 100 and a reflective layer 101 disposed on the base plate 100, and the plurality of light-emitting units 11 are disposed on the reflective layer 101, but the present invention is not limited thereto. The base plate 100 may be, for example, a ceramic base plate, a metal base plate, or a composite base plate, and the present invention is not limited thereto. The reflective layer 101 may be, for example, a metal plating or a coating of reflective white adhesive, to reflect the light beams generated by the plurality of light-emitting units 11.

[0045] Multiple light-emitting units 11 are disposed on the substrate 10 and arranged in an array to generate point light sources or line light sources. Furthermore, each light-emitting unit 11 can be a micro LED or a sub-millimeter light-emitting diode, but the present invention is not limited thereto. In this embodiment, the light-emitting component 1 further includes an encapsulation layer 12, which covers each light-emitting unit 11 to protect it.

[0046] The optical film 2A is disposed adjacent to the light-emitting component 1 and on the plurality of light-emitting units 11. In this embodiment, the optical film 2A is directly disposed on the encapsulation layer 12 of the light-emitting component 1, but the present invention is not limited thereto. In another embodiment, the optical film 2A may also be spaced apart from the light-emitting component 1 by a predetermined distance.

[0047] The optical film 2A can uniformly diffuse the light beam generated by the light-emitting unit 11. Furthermore, the optical film 2A can serve as a diffuser or brightener to convert a point light source or line light source into a surface light source. Figure 1 As shown, the optical film 2A provided in this embodiment of the invention includes a substrate layer 20 and a first optical structure 21. In one embodiment, the total thickness of the optical film 2A can be from 40 μm to 300 μm.

[0048] Furthermore, the optical film 2A has an incident light side and an exit light side opposite to the incident light side. The first optical structure 21 can be located on either the incident light side or the exit light side of the optical film 2A. In this embodiment, the first optical structure 21 is located on the incident light side of the optical film 2A.

[0049] Furthermore, the substrate 20 has a first surface 20a and a second surface 20b opposite to the first surface 20a. In this embodiment, the first surface 20a of the substrate 20 faces the light-emitting component 1. In this embodiment, the first optical structure 21 is disposed on the first surface 20a and located on the light-incident side of the substrate 20. However, in another embodiment, the first optical structure 21 may also be disposed on the second surface 20b. In this embodiment, the thickness of the first optical structure 21 ranges from 5 μm to 100 μm.

[0050] Furthermore, the material constituting the substrate layer 20 can be polyethylene terephthalate (PET), polystyrene (PS), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylic (PMMA), acrylic acid (MMA), etc. The present invention is not limited as long as the material constituting the substrate layer 10 allows light beams to pass through. Additionally, the thickness of the substrate layer 10 can range from 30 μm to 250 μm, preferably from 50 μm to 125 μm, for ease of processing.

[0051] In this embodiment, the first optical structure 21 includes a first low-refractive-index layer 210 and a first high-refractive-index layer 211. The first high-refractive-index layer 211 is located between the first low-refractive-index layer 210 and the light-emitting component 1. Accordingly, the first high-refractive-index layer 211 has a light-incident surface 211s facing the light-emitting component 1. In addition, the first high-refractive-index layer 211 completely covers the first low-refractive-index layer 210. In this embodiment, the light-incident surface 211s of the first high-refractive-index layer 211 is a flat surface and is directly connected to the encapsulation layer 12 of the light-emitting component 1, but the present invention is not limited thereto.

[0052] In other words, the light-emitting surface of the light-emitting unit 11 faces the optical film 2A. The light beam generated by the multiple light-emitting units 11 will enter the optical film 2A through the light-incident surface 211s of the first high refractive index layer 211, and then pass through the first low refractive index layer 210 and the substrate layer 20, and be emitted from the second surface 20b of the substrate layer 20.

[0053] Furthermore, in this embodiment, the refractive index of the substrate layer 20 is lower than that of the first high refractive index layer 211, but higher than that of the first low refractive index layer 210. Additionally, in this embodiment, the refractive index of the encapsulation layer 12 of the light-emitting component 1 is lower than that of the first high refractive index layer 211. For example, the refractive index of the encapsulation layer 12 may be 1.48, the refractive index of the first high refractive index layer 211 may be 1.61, the refractive index of the first low refractive index layer 210 may be 1.45, and the refractive index of the substrate layer 20 may be 1.57, but the present invention is not limited thereto.

[0054] Please refer to Figure 2A It should be noted that the interface between the first high-refractive-index layer 211 and the first low-refractive-index layer 210 includes a plurality of first inclined surfaces S1, and each first inclined surface S1 is inclined relative to the thickness direction of the substrate layer 20. In this embodiment, every two connected first inclined surfaces S1 together form a first included angle θ1.

[0055] In this embodiment, the first included angle θ1, the refractive index of the first high refractive index layer 211, and the refractive index of the first low refractive index layer 210 satisfy the following relationship: θ1≦(180-2*arcsin(n10 / n11)); where θ1 is the first included angle, n11 is the refractive index of the first high refractive index layer 211, and n10 is the refractive index of the first low refractive index layer 210. Thus, most of the light beam generated by the light-emitting unit 11 will initially be projected onto the first inclined surface S1 at an angle greater than the critical angle for total internal reflection, and will be totally reflected. By making the first included angle θ1 formed by the two connected first inclined surfaces S1 less than a specific value, the light beams generated by the light-emitting unit 11 that enter the first optical structure 21 at an angle within 10 degrees of inclination relative to the optical axis of the light-emitting unit 11 and are projected onto the first inclined surface S1 can all be totally reflected.

[0056] In a preferred embodiment, the ratio R (R = n10 / n11) between the refractive index n10 of the first low-refractive-index layer 210 and the refractive index n11 of the first high-refractive-index layer 211 is between 0.85 and 0.97, which can give the optical film 2A a better light-diffusing effect. It should be noted that when the ratio R is higher than 0.97, the optical refraction effect is poor. Furthermore, when the ratio R is less than 0.85, the material of the first low-refractive-index layer 210 needs to be a fluorine-containing material. However, the fluorine-containing first low-refractive-index layer 210 and commonly used materials for the first high-refractive-index layer 211, such as polymethyl methacrylate (PMMA), are difficult to bond and have poor compatibility.

[0057] It should be noted that when a light beam enters a medium with a lower refractive index (first low refractive index layer 210) from a medium with a higher refractive index (first high refractive index layer 211), and the angle of incidence of the light beam is greater than the critical angle, the light beam will be totally internally reflected. Conversely, when a light beam enters a medium with a higher refractive index from a medium with a lower refractive index, the light beam will not be totally internally reflected, but will be split into refracted light and reflected light.

[0058] Therefore, by positioning the first high-refractive-index layer 211 between the first low-refractive-index layer 210 and the light-emitting component 1, the probability of the light beam being totally reflected within the optical film 2A can be increased. On the other hand, since the refractive index of the substrate layer 20 is higher than that of the first low-refractive-index layer 210, the light beam will not be totally reflected after entering the substrate layer 20 from the first low-refractive-index layer 210.

[0059] like Figure 2AAs shown, the explanation uses the first initial beam L1 generated by a single light-emitting unit 11 as an example, but the beam generated by the light-emitting unit 11 is not limited to this. Furthermore, to facilitate the explanation of the beam path within the optical film 2A, some refracted or reflected beams are not shown. Figure 2A middle.

[0060] When the first initial beam L1 is projected onto the interface between the encapsulation layer 12 and the first high refractive index layer 211 (that is, the light incident surface 211s of the first high refractive index layer 211), a first reflected beam L11 and a first transmitted beam L12 are formed. The first reflected beam L11 is projected onto the reflective surface 101s of the light-emitting component 1 and then reflected into the first optical structure 21.

[0061] The first transmitted beam L12 is projected onto the first inclined plane S1 at an angle less than the critical angle for total internal reflection. Therefore, on the first inclined plane S1, another first reflected beam L13 and a first transmitted beam L14 are formed, which enter the first low-refractive-index layer 210. The first transmitted beam L14 exits after passing through the substrate layer 20. The first reflected beam L13 is projected onto another first inclined plane S1 at an angle less than the critical angle for total internal reflection, and is then split into a first transmitted beam L15 and a first reflected beam L16. It is worth noting that the first reflected beam L16 is projected onto the other first inclined plane S1 at an angle greater than the critical angle for total internal reflection, and can be totally reflected.

[0062] The first transmitted beam L15 is projected onto the first low-refractive-index layer 210 and then splits into a first transmitted beam L18 and a first reflected beam L17. The first transmitted beam L18 exits through the substrate layer 20 and is projected onto the optical film 2A. The first reflected beam L17 can continue to propagate between the first low-refractive-index layer 210 and the first high-refractive-index layer 211 through refraction, reflection, and total internal reflection.

[0063] Additionally, please refer to Figure 2B The second initial beam L2 generated by a single light-emitting unit 11 will be used as an example for illustration. Similarly, for ease of illustration of the beam path within the optical film 2A, some refracted or reflected beams are not shown. Figure 2B In the middle, the second initial beam L2 enters the first high refractive index layer 211 perpendicular to the incident surface 211s, and is then projected onto the first inclined surface S1. Since the incident angle of the second initial beam L2 projected onto the first inclined surface S1 is greater than the critical angle for total internal reflection, it will be totally internally reflected to form the second totally internally reflected beam L21, and will not directly enter the first low refractive index layer 210.

[0064] After the second total internal reflection beam L21 is projected onto another first inclined plane S1, it is split into a second transmitted beam L22 and a second reflected beam L23. After the second transmitted beam L22 is projected onto the first surface 20a of the substrate layer 20, it is split into a second transmitted beam L24 and a second reflected beam L25. The second transmitted beam L24 exits after passing through the substrate layer 20, while the other part of the second reflected beam L25 continues to be dispersed within the first optical structure 21 through reflection, refraction, or total internal reflection.

[0065] Furthermore, the second reflected beam L23 is reflected again onto the first inclined surface S1, and splits into another second transmitted beam L26 and another second reflected beam L27. The second transmitted beam L26 travels back and forth between the first high refractive index layer 211 and the first low refractive index layer 210 multiple times through refraction, reflection or total internal reflection, and is transmitted within the first optical structure 21.

[0066] Therefore, the second reflected beam L23 is refracted, reflected, or totally internally reflected multiple times at the interface between the first low-refractive-index layer 210 and the first high-refractive-index layer 211, and can be laterally transmitted a certain distance within the first optical structure 21. The second reflected beam L27 is projected onto the first inclined surface S1 at an incident angle greater than the critical angle of total internal reflection and is totally internally reflected. Furthermore, it should be noted that most of the beams entering the optical film 2A are nearly perpendicular to the incident surface 211s and enter the first high-refractive-index layer 211, such as the second initial beam L2, and are diffused through refraction, reflection, or total internal reflection. Accordingly, the optical film 2A provided in this embodiment can effectively diffuse the point light source generated by the light-emitting component 1.

[0067] The surface profile of the first low-refractive-index layer 210 can be matched with the surface profile of the first high-refractive-index layer 211. The first low-refractive-index layer 210 has multiple microstructures, each of which can be a triangular prism, trapezoidal prism, arc-shaped prism, convex pyramid, concave pyramid, or other pyramid, but the present invention is not limited thereto.

[0068] Please refer to Figure 3 This is a partially exploded perspective view of the first optical structure according to an embodiment of the present invention. In this embodiment, the first low-refractive-index layer 210 has a plurality of recessed microstructures 210A, and a high-refractive-index layer 211 fills the plurality of recessed microstructures 210A. Specifically, the first low-refractive-index layer 210 with a plurality of recessed microstructures 210A can be fabricated first, and then a high-refractive-index adhesive material can be filled into the plurality of recessed microstructures 210A to form the first high-refractive-index layer 211. Therefore, the first high-refractive-index layer 211 will have a plurality of protruding microstructures 211A.

[0069] Accordingly, the shapes of the recessed microstructure 210A of the first low-refractive-index layer 210 and the protruding microstructure 211A of the first high-refractive-index layer 211 are mutually matched. In this embodiment, the recessed microstructure 210A is a concave pyramid microstructure, and the protruding microstructure 211A is a convex pyramid microstructure. The recessed microstructure 210A may include four interconnected triangular bevels, and the four triangular bevels are connected to each other so that the recessed microstructure 210A has a closed opening end, which helps to make the light beam entering the first optical structure 21 be reflected and refracted more times. In another embodiment, each recessed microstructure 210A (or protruding microstructure 211A) may also have three triangular bevels, but the present invention is not limited thereto.

[0070] When the light beam generated by one of the light-emitting units 11 enters the first optical structure 21, it can be transmitted laterally a certain distance within the first optical structure 21 through multiple reflections and refractions before entering the substrate layer 20. In this way, the light uniformity of the optical film 2A can be improved.

[0071] Please refer to Figure 4 This is a partial side view of a light-emitting module according to another embodiment of the present invention. Components identical to those in the light-emitting module Z1 of the previous embodiment have the same reference numerals, and identical parts will not be described again. The first optical structure 21 of this embodiment has a plurality of bubbles b1. Specifically, at least one of the first low-refractive-index layer 210 and the first high-refractive-index layer 211 has a plurality of bubbles b1 randomly dispersed therein.

[0072] In one embodiment, the plurality of bubbles b1 are microbubbles or ultrafine bubbles. Furthermore, at least 90% of the bubbles b1 have a bubble diameter less than 10 μm, preferably less than 1 μm. Accordingly, the average bubble diameter of the plurality of bubbles b1 is also less than 10 μm, preferably less than 1 μm. Since the shape of the bubbles b1 is not necessarily circular, in this invention, "bubble diameter of bubble b1" refers to the average of the maximum and minimum diameters of individual bubbles b1. Additionally, "average bubble diameter" refers to the average of the bubble diameters of all bubbles b1.

[0073] Furthermore, the (area) distribution density of multiple bubbles b1 is greater than or equal to 100 bubbles / mm². 2 In addition, the volume distribution density of the multiple bubbles b1 is at least 1000 / mm². 3The medium filling the plurality of bubbles b1 can be air, nitrogen, helium, neon, carbon dioxide, or any combination thereof. However, in another embodiment, the first high refractive index layer 211 may also have a plurality of dispersed bubbles b1, while the first low refractive index layer 210 and the substrate layer 20 have almost no bubbles. In yet another embodiment, both the first low refractive index layer 210 and the first high refractive index layer 211 may have bubbles b1.

[0074] It should be noted that when a light beam enters an optically denser medium (optical film M1) from an optically less dense medium (air), the angle of refraction of the beam will be smaller than the angle of incidence. Conversely, when a light beam enters an optically less dense medium from an optically denser medium, the angle of refraction of the beam will be larger than the angle of incidence. Since the first optical structure 21 has multiple bubbles b1 distributed at a high density inside, the first optical structure 21 will have different transmission media for the light beam. Therefore, when the light beam is transmitted within the first optical structure 21, it is easy for refraction, reflection, and scattering to occur at multiple angles and in multiple directions between the interfaces of different media, thereby further enhancing the effect of diffusing the light beam.

[0075] Please refer to Figures 5 to 6 , Figure 5 This is a partial side view of the light-emitting module according to the second embodiment of the present invention. Figure 6 for Figure 5 A partially enlarged schematic diagram of region VI. The components of the light-emitting module Z2 in this embodiment have the same reference numerals as those in the light-emitting module Z1 of the previous embodiment, and the identical parts will not be described again.

[0076] The optical film 2B of this embodiment includes a substrate layer 20, a first optical structure 21, and a second optical structure 22. The first optical structure 21 and the second optical structure 22 are located on opposite sides of the substrate layer 20. Specifically, the second optical structure 22 is located on the second surface 20b of the substrate layer 20, which is the light-emitting side of the optical film 2B. In this embodiment, the refractive index of the second optical structure 22 is greater than the refractive index of air (1.33).

[0077] like Figure 5 and Figure 6 As shown, the surface of the second optical structure 22 includes multiple second inclined surfaces S2, and a second included angle θ2 is formed between every two connected second inclined surfaces S2. In this embodiment, the second included angle θ2 may be greater than or equal to the first included angle θ1. More specifically, the second optical structure 22 includes multiple microstructures, each of which may be a triangular prism, trapezoidal prism, arc-shaped prism, semi-circular prism, convex pyramid, concave pyramid, pyramidal prism, or hemispherical shape, and the present invention is not limited thereto.

[0078] like Figure 5As shown, in this embodiment, the first spacing d1 between any two microstructures of the first low-refractive-index layer 210 may be less than or equal to the second spacing d2 between any two microstructures of the second optical structure 22. Furthermore, the cross-sectional width of the microstructures of the second optical structure 22 may be greater than or equal to the cross-sectional width of the microstructures of the first low-refractive-index layer 210.

[0079] Please refer to Figure 7 This image shows a partial three-dimensional schematic diagram of an optical film according to an embodiment of the present invention. Figure 7 In the illustrated embodiment, the plurality of convex pillar microstructures (e.g., triangular prisms, semi-cylinders, or polygonal prisms) of the second optical structure 22 extend along the second direction D2, but the invention is not limited to this example. Additionally, the plurality of convex pillar microstructures (e.g., triangular prisms, semi-cylinders, or polygonal prisms) of the first low-refractive-index layer 210 are arranged side-by-side in the first direction D1 and extend along the second direction D2, but the invention is not limited to this example.

[0080] In this embodiment, each of the protruding pillar microstructures of the first low-refractive-index layer 210 is an inverted triangular prism and has a first ridge 21L. Each of the protruding pillar microstructures of the second optical structure 22 is a triangular prism and has a second ridge 22L, and the first ridge 21L and the second ridge 22L have the same extending direction (second direction D2).

[0081] Please refer to Figure 8 This image shows a partial perspective view of an optical film according to another embodiment of the present invention. In the optical film 2B' of this embodiment, the first low-refractive-index layer 210 includes a plurality of first protruding pillar microstructures, and the second optical structure 22 includes a plurality of second protruding pillar microstructures, but the first and second protruding pillar microstructures have different extension directions. In one embodiment, the angle formed between the extension directions of the first protruding pillar microstructures of the first low-refractive-index layer 210 and the second protruding pillar microstructures of the second optical structure 22 ranges from 45 degrees to 90 degrees, preferably from 80 to 90 degrees.

[0082] The first low-refractive-index layer 210 has a plurality of first protruding pillar microstructures arranged side by side in the second direction D2, and each first protruding pillar microstructure extends along the first direction D1. However, the second optical structure 22 has a plurality of second protruding pillar microstructures arranged side by side in the first direction D1, and each second protruding pillar microstructure extends along the second direction D2.

[0083] like Figure 8 As shown, for example, each first protruding pillar microstructure of the first low-refractive-index layer 210 is an inverted triangular prism and has a first ridge 21L. Each second protruding pillar microstructure of the second optical structure 22 is a triangular prism and has a second ridge 22L. The angle formed between the extension direction of the first ridge 21L and the extension direction of the second ridge 22L can range from 45 degrees to 90 degrees. Compared to Figure 7 The optical film 2B shown is Figure 8 The optical film 2B' shown can have a more uniform light diffusion effect.

[0084] Please refer to Figure 9 The diagram shows a partially enlarged schematic of the light-emitting module according to different embodiments of the present invention. Figure 9 The illustrated embodiments and Figure 6 Components that are identical or similar to those in the embodiments have the same reference numerals, and the identical parts will not be described again.

[0085] At least one of the second optical structure 22, the first low-refractive-index layer 210, and the first high-refractive-index layer 211 has a plurality of bubbles b1 and a plurality of nanoparticles P1 randomly dispersed therein, and at least one nanoparticle P1 is bonded to one of the bubbles b1. In this embodiment, the first high-refractive-index layer 211 is used as an example. As mentioned above, the plurality of bubbles b1 may include microbubbles, ultrafine bubbles, or a mixture thereof. Furthermore, at least 90% of the bubbles b1 have a bubble diameter of less than 10 μm, preferably less than 1 μm.

[0086] In this embodiment, some nanoparticles P1 will bind to the corresponding bubbles b1. When nanoparticles P1 bind to bubbles b1, the bubbles b1 bound to P1 will not dissolve in the colloid, ensuring the presence of bubbles b1. Specifically, the nanoparticles P1 bound to bubbles b1 are usually close to the edge of the bubble b1 and located inside the bubble b1, but this is not a limitation of the invention. A small number of nanoparticles P1 bound to bubbles b1 are located outside the bubble b1, but still close to the edge of the bubble b1.

[0087] It should be noted that not all nanoparticles P1 will combine with bubbles b1. That is, some bubbles b1 will be individually dispersed within the first high refractive index layer 211. On the other hand, some nanoparticles P1 that are not combined with bubbles b1 will also be individually dispersed within the first high refractive index layer 211. Furthermore, in this invention, it is not limited to a bubble b1 combining with only one nanoparticle P1; it is also possible for a bubble b1 to combine with two or more nanoparticles P1.

[0088] In one embodiment, among a plurality of nanoparticles P1, 90% of the nanoparticles P1 have a particle size not exceeding 100 nm, preferably 30 nm to 50 nm. Accordingly, the average particle size of the nanoparticles P1 does not exceed 100 nm, preferably 30 nm to 50 nm. In this invention, "particle size of nanoparticle P1" refers to the average of the maximum and minimum diameters of individual nanoparticles P1.

[0089] Furthermore, "average particle size of nanoparticles P1" refers to the average particle size of all nanoparticles P1. Additionally, nanoparticles P1 can be nano-metals, nano-oxides, or nano-diamonds. In the preferred embodiment, the material of the nanoparticles P1 is silicon dioxide or titanium dioxide. The first optical structure 21, including a plurality of nanoparticles P1 dispersed therein, can also enhance the light-diffusing effect.

[0090] Please refer to Figure 10 In another embodiment of the optical film 2B, at least one of the second optical structure 22, the first low-refractive-index layer 210, and the first high-refractive-index layer 211 may have a plurality of randomly dispersed bubbles b1 within it. In this embodiment, the second optical structure 22 having bubbles b1 is used as an example. In each microstructure of the second optical structure 22, the volume distribution density (number per unit volume) of the plurality of bubbles b1 decreases from the tip of the microstructure of the second optical structure 22 toward the substrate layer 20.

[0091] Furthermore, the portion of the microstructure above half its height of the second optical structure 22 is defined as the upper half of the microstructure, and the portion of the microstructure below half its height of the second optical structure 22 is defined as the lower half of the microstructure. Accordingly, the volume distribution density of the plurality of bubbles b1 in the upper half of each microstructure of the second optical structure 22 will be greater than that in the lower half.

[0092] Please refer to Figure 11 In another embodiment of the optical film 2B, the second optical structure 22 may have multiple bubbles b1 and multiple nanoparticles P1, and at least one nanoparticle P1 is combined with bubble b1 to enhance the light amplification effect. The bubble diameter range of bubble b1 and the particle size and material of nanoparticle P1 have been described above and will not be repeated here.

[0093] Please refer to Figure 12 This diagram shows a partial side view of the light-emitting module according to a third embodiment of the present invention. Components in the light-emitting module Z3 of this embodiment have the same reference numerals as those in the light-emitting module Z2 of the second embodiment, and the identical parts will not be described again. The third embodiment differs from the second embodiment in that the optical film 2B and the light-emitting component 1 are separated from each other. That is, a gap G1 is defined between the optical film 2B and the encapsulation layer 12 of the light-emitting component 1, and the gap G1 can be filled with air.

[0094] Furthermore, the light-incident surface 211s of the first high-refractive-index layer 211 will not be in close contact with the encapsulation layer 12 of the light-emitting component 1. Since the difference between the refractive index of air and the refractive index n10 of the first high-refractive-index layer 211 is large, it helps to diffuse the light beam.

[0095] Please refer to Figure 13 , Figure 13 This is a partial side view of the light-emitting module according to the fourth embodiment of the present invention. The same components of the light-emitting module Z4 in this embodiment have the same reference numerals as those in the light-emitting module Z3 in the third embodiment, and the identical parts will not be described again. In this embodiment, the encapsulation layer 12' of the light-emitting component 1 does not completely cover the reflective surface 101s of the substrate 10. Furthermore, the encapsulation layer 12' includes multiple separate portions, and each portion covers the corresponding light-emitting unit 11.

[0096] Furthermore, the optical film 2A and the light-emitting component 1 are also separated from each other, defining a gap G1, which can be filled with air, but the present invention is not limited to this example. In another embodiment, the optical film 2A can also partially contact the encapsulation layer 12'. That is, multiple gaps can be defined between the light-incident surface 211s of the first high refractive index layer 211 and the encapsulation layer 12'.

[0097] Please refer to Figure 14 , Figure 14 This is a partial side view of the light-emitting module according to the fifth embodiment of the present invention. Components identical to those in the light-emitting module Z5 of the second embodiment have the same reference numerals, and the identical parts will not be described again.

[0098] In this embodiment, the optical film 2C includes a substrate layer 20, a first optical structure 21, and a second optical structure 22. The second optical structure 22 includes a second high-refractive-index layer 220 and a second low-refractive-index layer 221. The second high-refractive-index layer 220 is located between the second low-refractive-index layer 221 and the substrate layer 20. That is, in this embodiment, the light beam after passing through the substrate layer 20 will first enter the second high-refractive-index layer 220 and then enter the second low-refractive-index layer 221. When the incident angle of the light beam at the interface between the second high-refractive-index layer 220 and the second low-refractive-index layer 221 is greater than the critical angle for total internal reflection, the light beam will also be totally internally reflected. Accordingly, the light beam will also be refracted and reflected multiple times within the second optical structure 22 and transmitted laterally, so that the optical film 2C has a better light amplification effect.

[0099] The refractive index of the second high-refractive-index layer 220 is higher than that of the second low-refractive-index layer 221. Furthermore, the surface profile of the second high-refractive-index layer 220 matches the surface profile of the second low-refractive-index layer 221. The interface between the second high-refractive-index layer 220 and the second low-refractive-index layer 221 includes a plurality of second inclined surfaces S2, each of which is inclined relative to the thickness direction of the substrate layer 20.

[0100] like Figure 14As shown, the second high-refractive-index layer 220 has multiple microstructures. The second spacing d2 between two adjacent microstructures of the second high-refractive-index layer 220 is greater than the first spacing d1 between two adjacent microstructures of the first low-refractive-index layer 210, but the present invention is not limited thereto. In addition, the second low-refractive-index layer 221 covers the second high-refractive-index layer 220 and has an outer surface 221s. In this embodiment, the outer surface 221s is the light-emitting surface of the optical film 2C and is a flat surface.

[0101] In this embodiment, by placing the second high-refractive-index layer 220 of the second optical structure 22 between the substrate layer 20 and the second low-refractive-index layer 221, the number of times the light beam projected onto the second inclined surface S2 is totally internally reflected can be increased, allowing the light beam to propagate laterally within the second optical structure 22. Thus, the light-amplifying effect of the optical film 2C can be further enhanced.

[0102] Please refer to Figure 15 as well as Figure 16 . Figure 15 This is a partial side view of the light-emitting module according to the sixth embodiment of the present invention, and Figure 16 for Figure 15 A partial exploded perspective view of the optical film. Components identical to those in the light-emitting module Z6 of this embodiment and the light-emitting module Z5 of the fifth embodiment have the same reference numerals, and identical parts will not be described again. For example... Figure 15 The optical film 2D shown has a second high-refractive-index layer 220 with multiple microstructures. The second spacing d2 between two adjacent microstructures of the second high-refractive-index layer 220 is equal to the first spacing d1 between two adjacent microstructures of the first low-refractive-index layer 210, but the present invention is not limited thereto.

[0103] Please refer to Figure 16 Specifically, the first low-refractive-index layer 210 includes a plurality of recessed microstructures 210A. A first high-refractive-index layer 211 fills the plurality of recessed microstructures 210A to form a plurality of protruding microstructures 211A, and the shapes of the protruding microstructures 211A and the recessed microstructures 210A are mutually compatible. In this embodiment, the recessed microstructures 210A are concave pyramidal microstructures, and the protruding microstructures 211A are convex pyramidal microstructures. Each recessed microstructure 210A (or protruding microstructure 211A) in this embodiment has four interconnected first inclined surfaces S1, and each first inclined surface S1 is a triangular inclined surface, but the invention is not limited thereto. In another embodiment, each recessed microstructure 210A (or protruding microstructure 211A) may also have only three interconnected first inclined surfaces S1.

[0104] like Figure 16As shown, the apex angle of at least one triangular inclined plane satisfies the following relationship with the refractive index of the first high-refractive-index layer 211 and the refractive index of the first low-refractive-index layer 210: θ≦(180-2*arcsin(n10 / n11)); where θ is the apex angle of the triangular inclined plane, n11 is the refractive index of the first high-refractive-index layer 211, and n10 is the refractive index of the first low-refractive-index layer 210. This helps to cause the light beam entering the first optical structure 21 to be reflected and refracted more frequently.

[0105] Unlike the first optical structure 21, the second high-refractive-index layer 220 of the second optical structure 22 includes a plurality of recessed microstructures 220A, and the second low-refractive-index layer 221 is filled with the plurality of recessed microstructures 220A to form a plurality of protruding microstructures 221A. The recessed microstructures 220A can be concave pyramidal microstructures, and the protruding microstructures 221A can be convex pyramidal microstructures. Accordingly, the shapes of each recessed microstructure 220A of the second high-refractive-index layer 220 and each protruding microstructure 221A of the second low-refractive-index layer 221 are mutually compatible. Furthermore, each recessed microstructure 220A of the second high-refractive-index layer 220 has four interconnected second inclined surfaces S2, and each second inclined surface S2 is a triangular inclined surface, but the invention is not limited thereto. In another embodiment, each recessed microstructure 220A of the second high-refractive-index layer 220 may also have only three interconnected second inclined surfaces S2.

[0106] Please refer to Figure 17 , Figure 17 This is a partial side view of the light-emitting module according to the seventh embodiment of the present invention. Components identical to those in the light-emitting module Z7 of this embodiment and those in the light-emitting module Z5 of the fifth embodiment have the same reference numerals, and the identical parts will not be described again.

[0107] In this embodiment, the second optical structure 22 of the optical film 2E includes a second high refractive index layer 220, a second low refractive index layer 221, and a third high refractive index layer 222. The second low refractive index layer 221 is located between the second high refractive index layer 220 and the third high refractive index layer 222. It is worth mentioning that the interface between the second high refractive index layer 220 and the second low refractive index layer 221 includes a plurality of second inclined surfaces S2, but the interface between the second low refractive index layer 221 and the third high refractive index layer 222 is a flat surface.

[0108] In this embodiment, the surface of the third high-refractive-index layer 222 includes a plurality of third inclined surfaces S3, and a third included angle θ3 is formed between every two connected third inclined surfaces S3. In this embodiment, the second included angle θ2 formed between two connected second inclined surfaces S2 is less than or equal to the third included angle θ3.

[0109] Furthermore, each microstructure of the second high refractive index layer 220 and each microstructure of the third high refractive index layer 222 have different cross-sectional widths. The second spacing d2 between any two adjacent microstructures of the second high refractive index layer 220 is less than or equal to the third spacing d3 between any two adjacent microstructures of the third high refractive index layer 222.

[0110] Please refer to Figure 18 , Figure 18 This is a partial side view of the light-emitting module according to the eighth embodiment of the present invention. Components identical to those in the light-emitting module Z8 of the fifth embodiment have the same reference numerals, and the identical parts will not be described again.

[0111] In this embodiment, the first optical structure 21 and the second optical structure 22 of the optical film 2F are located on the light-incident side (first surface 20a) and the light-exiting side (second surface 20b) of the substrate layer 20, respectively. In this embodiment, the light-incident surface 211s of the first high-refractive-index layer 211 of the first optical structure 21 and the outer surface 221s (light-exiting surface) of the second low-refractive-index layer 221 of the second optical structure 22 are not flat surfaces, but have multiple recessed microstructures.

[0112] In detail, when fabricating the first optical structure 21 of this embodiment, a first low-refractive-index layer 210 with multiple recessed microstructures can be formed on the first surface 20a of the substrate layer 20 using a structural wheel. Then, a high-refractive-index adhesive is used to fill the multiple recessed microstructures, and simultaneously, multiple recessed microstructures are formed on the outer surface of the high-refractive-index adhesive using the same structural wheel, thus forming a first high-refractive-index layer 211 covering the first low-refractive-index layer 210. This not only increases the beam amplification effect but also increases the ease of manufacturing the optical film 2F.

[0113] Therefore, the first high-refractive-index layer 211 has multiple protruding microstructures on the side facing the first low-refractive-index layer 210, and the shapes of the protruding and recessed microstructures complement each other. Additionally, the light-incident surface 211s of the first high-refractive-index layer 211 also has multiple recessed microstructures. It is worth noting that each recessed microstructure of the first high-refractive-index layer 211 can have approximately the same shape as each recessed microstructure of the first low-refractive-index layer 210.

[0114] In one embodiment, the recessed microstructure of both the first low-refractive-index layer 210 and the first high-refractive-index layer 211 can be Figure 16 The recessed microstructure 210A is shown, while the protruding microstructure of the first high-refractive-index layer 211 is, for example, Figure 16The convex microstructure 211A shown is not limited to this invention. Furthermore, the position of the recessed microstructure in the first high-refractive-index layer 211 does not necessarily need to be aligned with the recessed microstructure in the first low-refractive-index layer 210. This can improve the light-diffusing effect of the optical film 2F.

[0115] Similarly, the second optical structure 22 includes a second high-refractive-index layer 220 and a second low-refractive-index layer 221. In fabricating the second optical structure 22 of this embodiment, a structural wheel can be used to form a second high-refractive-index layer 220 with multiple recessed microstructures on the second surface 20b of the substrate layer 20. Then, a low-refractive-index adhesive is used to fill the multiple recessed microstructures, and simultaneously, the same structural wheel is used to form multiple recessed microstructures on the outer surface of the low-refractive-index adhesive, thereby forming a second low-refractive-index layer 221 covering the second high-refractive-index layer 220.

[0116] Therefore, the second low-refractive-index layer 221 has multiple protruding microstructures on the side facing the second high-refractive-index layer 220, and the shapes of the protruding and recessed microstructures complement each other. Furthermore, the outer surface 221s of the second low-refractive-index layer 221 has multiple recessed microstructures. Additionally, the positions of the recessed microstructures in the second low-refractive-index layer 221 do not necessarily need to be aligned with the recessed microstructures in the second high-refractive-index layer 220. This enhances the light-diffusing effect of the optical film 2F.

[0117] Compared to Figure 15 In this embodiment, by having multiple recessed microstructures on both the light-incident surface 211s and the light-exiting surface (outer surface 221s) of the optical film 2F, the light-diffusing effect of the optical film 2F can be further improved. However, in another embodiment, Figure 18 The second optical structure 22 shown can also be omitted or replaced with Figure 12 , Figure 15 or Figure 17 The second optical structure 22 is shown.

[0118] Furthermore, in this embodiment, the optical film 2F and the light-emitting component 1 are separated from each other, thus defining a gap G1, but the present invention is not limited thereto. In another embodiment not shown in the figures, the optical film 2F of this embodiment may also be partially connected to the encapsulation layer 12 of the light-emitting component 1. Since the light-incident surface 211s of the optical film 2F has multiple recessed microstructures, when the optical film 2F is fixed to the encapsulation layer 12, multiple gaps will be defined between the optical film 2F and the encapsulation layer 12.

[0119] Beneficial effects of the embodiments

[0120] One of the beneficial effects of the present invention is that the optical film and the light-emitting module using it provided by the present invention can diffuse the light beam generated by the light-emitting component 1 through the technical solutions of "optical films 2A-2E,2B' are disposed on multiple light-emitting units 11, and the substrate layer 20 and the first optical structure 21", "the first optical structure 21 includes a first high refractive index layer 211 and a first low refractive index layer 210, the first high refractive index layer 211 is located between the light-emitting component 1 and the first low refractive index layer 210", and "the interface between the first high refractive index layer 211 and the first low refractive index layer 210 includes multiple first inclined surfaces S1, and each first inclined surface S1 is inclined relative to the thickness direction of the substrate layer 20", so that the light beam output by the light-emitting modules Z1-Z8 has a more uniform brightness distribution.

[0121] Furthermore, by ensuring that the first included angle θ1 formed by the two connected first inclined planes S1, the refractive index n11 of the first high refractive index layer 211, and the refractive index n10 of the first low refractive index layer 210 satisfy the following relationship: θ1≦(180-2*arcsin(n10 / n11)), the probability of the light beam generated by the light-emitting unit 11 being totally reflected when it is first projected onto the first inclined plane S1 can be greatly increased, thereby improving the light amplification effect.

[0122] Compared to existing backlight modules, the light-emitting modules Z1-Z8 of this invention can output diffused point light sources. Therefore, when the light-emitting modules Z1-Z8 of this invention are applied in a display device, the use of diffuser sheets and brightness enhancement sheets can be omitted. Furthermore, by using the light-emitting modules Z1-Z8 of any embodiment of this invention in a display device, even with a reduction in the number of optical films within the optical components, a uniform brightness distribution can still be achieved in the display area. This further reduces the overall thickness of the optical components and the size of the display device.

[0123] Furthermore, by using any of the optical films 2A-2F, 2B' provided in this embodiment of the invention, the light beam generated by the light-emitting component 1 can be diffused. Additionally, in this embodiment of the invention, the interior of the first optical structure 21 (or the second optical structure 22) may have a plurality of bubbles b1 distributed in a high density to increase the refraction, reflection, and scattering of the light beam, thereby achieving the effect of diffusing the light beam.

[0124] In one embodiment, the first optical structure 21 (or the second optical structure 22) further includes a plurality of nanoparticles P1 distributed therein. Some nanoparticles P1 are combined with some air bubbles b1. Thus, in the first optical structure 21 or the second optical structure 22, the air bubbles b1 combined with the nanoparticles P1 are more easily retained, thereby giving the first optical structure 21 or the second optical structure 22 a greater number of air bubbles b1, thus improving the light amplification effect.

[0125] It should be noted that the optical films 2A-2F, 2B' do not necessarily have to be directly disposed on the light-emitting component 1. Other optical films (such as brightness enhancement films) or quantum dot films can also be disposed between the optical films 2A-2F, 2B' and the light-emitting component 1. Furthermore, the optical films 2A-2F, 2B' of this embodiment are not limited to application in the light-emitting modules Z1-Z8, but can also be applied within optical components and used in conjunction with other optical films (such as light guide plates) to diffuse the light beam. The optical films 2A-2F, 2B' provided in this embodiment can also be applied in lighting devices.

[0126] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of protection of the claims of the present invention. Therefore, all equivalent technical changes made based on the content of the present invention specification and drawings are included within the scope of protection of the claims of the present invention.

Claims

1. A light-emitting module, characterized in that, The light-emitting module includes: A light-emitting component includes a substrate and a plurality of light-emitting units disposed on the substrate; and An optical film is disposed above the plurality of light-emitting units, wherein the optical film comprises: A basal layer; and A first optical structure is disposed on the substrate layer and includes a first high refractive index layer and a first low refractive index layer, wherein the first high refractive index layer is located between the light-emitting component and the first low refractive index layer, and the interface between the first high refractive index layer and the first low refractive index layer includes a plurality of first inclined surfaces, and each first inclined surface is inclined relative to the thickness direction of the substrate layer. Wherein, the light-emitting surface of each of the light-emitting units faces the optical film; and The two connected first inclined planes together form a first included angle, and the first included angle satisfies the following relationship with the refractive index of the first high refractive index layer and the refractive index of the first low refractive index layer: θ1≦(180-2*arcsin(n10 / n11)); where θ1 is the first included angle, n11 is the refractive index of the first high refractive index layer, and n10 is the refractive index of the first low refractive index layer.

2. The light-emitting module according to claim 1, characterized in that, The first high refractive index layer has a light-incident surface facing the light-emitting component. The light-incident surface is a flat surface, and the ratio between the refractive index of the first low refractive index layer and the refractive index of the first high refractive index layer ranges from 0.85 to 0.

97.

3. The light-emitting module according to claim 1, characterized in that, The optical film further includes a second optical structure, wherein the first optical structure and the second optical structure are located on opposite sides of the substrate layer, and the refractive index of the second optical structure is greater than that of air.

4. The light-emitting module according to claim 3, characterized in that, Two connected first inclined surfaces together form a first included angle, and the surface of the second optical structure includes a plurality of second inclined surfaces, and two connected second inclined surfaces together form a second included angle, the second included angle being greater than or equal to the first included angle.

5. The light-emitting module according to claim 3, characterized in that, At least one of the second optical structure, the first high refractive index layer, and the first low refractive index layer has a plurality of bubbles distributed therein, and at least 90% of the plurality of bubbles have a bubble diameter of less than 10 μm.

6. The light-emitting module according to claim 1, characterized in that, The first low-refractive-index layer or the first high-refractive-index layer contains a plurality of bubbles and a plurality of nanoparticles, at least one of the nanoparticles is combined with one of the bubbles, and the average particle size of the plurality of nanoparticles does not exceed 100 nm.

7. The light-emitting module according to claim 1, characterized in that, The first low-refractive-index layer has multiple recessed microstructures, and the first high-refractive-index layer fills the multiple recessed microstructures to form multiple protruding microstructures, and the shape of each protruding microstructure matches the shape of the recessed microstructure.

8. The light-emitting module according to claim 7, characterized in that, Each of the recessed microstructures is a concave pyramid microstructure, and each of the protruding microstructures is a convex pyramid microstructure.

9. The light-emitting module according to claim 1 or 7, characterized in that, The first high refractive index layer has a light-incident surface, and the light-incident surface has multiple recessed microstructures.

10. The light-emitting module according to claim 9, characterized in that, The optical film further includes a second optical structure, wherein the first optical structure and the second optical structure are located on the light-incident side and the light-outcident side of the substrate layer, respectively. The second optical structure includes a second high refractive index layer and a second low refractive index layer, wherein the second high refractive index layer is located between the second low refractive index layer and the light-emitting component, and the second low refractive index layer has an outer surface with a plurality of recessed microstructures.

11. An optical film, characterized in that, The optical film includes: A basal layer; and A first optical structure is disposed on a light-incident side of the substrate layer and includes a first high refractive index layer and a first low refractive index layer, wherein the first low refractive index layer is located between the first high refractive index layer and the substrate layer. The interface formed between the first high refractive index layer and the first low refractive index layer includes a plurality of first inclined surfaces, and each of the first inclined surfaces is inclined relative to the thickness direction of the substrate layer. The ratio between the refractive index of the first low-refractive-index layer and the refractive index of the first high-refractive-index layer ranges from 0.85 to 0.

97. The first low-refractive-index layer has multiple recessed microstructures, and the first high-refractive-index layer fills the multiple recessed microstructures to form multiple protruding microstructures, wherein the shape of each protruding microstructure matches the shape of the recessed microstructure; and Each of the recessed microstructures is a concave pyramid microstructure, and each of the protruding microstructures is a convex pyramid microstructure. The convex pyramid microstructure includes at least one triangular inclined plane, and the vertex angle of at least one of the triangular inclined planes, the refractive index of the first high refractive index layer, and the refractive index of the first low refractive index layer satisfy the following relationship: θ≦(180-2*arcsin(n10 / n11); where θ is the vertex angle, n11 is the refractive index of the first high refractive index layer, and n10 is the refractive index of the first low refractive index layer.

12. The optical film according to claim 11, characterized in that, The optical film further includes: a second optical structure located on the light-emitting side of the substrate layer, the second optical structure including a second high refractive index layer and a second low refractive index layer, wherein the second high refractive index layer is located between the second low refractive index layer and the substrate layer, wherein the second high refractive index layer includes a plurality of recessed microstructures, and the second low refractive index layer fills the plurality of recessed microstructures of the second high refractive index layer to form a plurality of protruding microstructures.

13. The optical film according to claim 12, characterized in that, The first high refractive index layer has a light-incident surface, and the light-incident surface has a plurality of recessed microstructures; the second low refractive index layer has an outer surface, and the outer surface has a plurality of recessed microstructures.

Images