Optical compensation film

Abstract

The present application provides an optical compensation film. The optical compensation film comprises a substrate and a first optical structure. The first optical structure comprises a first high refractive index layer and a first low refractive index layer. The first high refractive index layer and the first low refractive index layer are located on the first side or the second side of the substrate. The first high refractive index layer is located downstream of the light path of the first low refractive index layer. The first high refractive index layer has a plurality of first boundary lines interlaced on a first textured surface facing the first low refractive index layer, and defines a plurality of first regions. The plurality of first regions respectively form a plurality of first microstructures. Each first microstructure comprises a plurality of first inclined surfaces, and two first inclined surfaces opposite to each other together form a first included angle. The first included angle θ1 and the refractive index n H1 of the first high refractive index layer and the refractive index n L1 of the first low refractive index layer satisfy the following relationship: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, θ1 is the first included angle, n H1 is the refractive index of the first high refractive index layer, and n L1 is the refractive index of the first low refractive index layer.

Description

Technical Field

[0001] This invention relates to an optical film, and more particularly to an optical compensation film that can improve the color shift problem of organic light-emitting diode display devices or lighting devices. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are used in display or lighting devices because they have advantages such as self-illumination, fast response time, high brightness, high lumen efficiency, low operating voltage, thinness and flexibility.

[0003] Existing organic light-emitting diode (OLED) display devices or lighting devices typically include multiple sub-pixels, each used to generate different colors of light (e.g., red, blue, and green) to mix into white light. Due to the positional configuration of the sub-pixels, the emission angles of the different colors of light are mismatched. As the viewer's viewing angle increases, the displayed image from the OLED display device or lighting device will exhibit color shift.

[0004] On the other hand, some organic light-emitting diode (OLED) display devices utilize the microcavity resonance effect to improve luminous efficiency. However, this also makes the intensity and wavelength of the light emitted by the OLED highly dependent on the emission angle. As the observer's viewing angle increases, the emission spectrum of individual sub-pixels shifts towards shorter wavelengths, a phenomenon known as blueshift. Furthermore, because the brightness of red and blue sub-pixels decreases faster with angle than that of green sub-pixels, white displayed on an OLED display or lighting device appears greenish when viewed at large angles.

[0005] For flexible organic light-emitting diode (OLED) display devices or lighting devices, color shift is also a problem for similar reasons. Specifically, when a flexible OLED display device or lighting device is bent, color shift occurs in the edge areas of the displayed image.

[0006] Therefore, how to reduce color shift of the displayed image of organic light-emitting diode display devices or lighting devices at a wide viewing angle, and how to improve edge color shift when flexible organic light-emitting diode display devices or lighting devices are bent, are still problems that the industry is currently working to solve. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an optical compensation film that can reduce color shift in images as the viewing angle increases, thereby improving the quality of displayed images.

[0008] One object of the present invention is to provide an optical compensation film comprising a substrate 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 and the first low-refractive-index layer are located on a first side or a second side of the substrate. The first high-refractive-index layer is located downstream of the optical path of the first low-refractive-index layer. The first high-refractive-index layer has multiple intersecting first boundary lines on a first textured surface facing the first low-refractive-index layer, defining multiple first regions. Each of the multiple first regions forms multiple first microstructures. Each first microstructure includes multiple first inclined planes, and two opposing first inclined planes together form a first included angle. The first included angle θ1 is related to the refractive index n of the first high-refractive-index layer. H1 and the refractive index n of the first low-refractive-index layer L1 The following relationship is satisfied between them: |θ1-(180-2*(arcsin(n) L1 / n H1 )*180 / π))|≤10, θ1 is the first included angle, n H1 Let n be the refractive index of the first high-refractive-index layer, and n be the refractive index of the first high-refractive-index layer. L1 is the refractive index of the first low-refractive-index layer.

[0009] One object of the present invention is to provide an optical compensation film comprising a substrate and a first optical structure. The first optical structure includes a first high-refractive-index layer and a first low-refractive-index layer located together on a first side or a second side of the substrate. The first high-refractive-index layer is located downstream of the optical path of the first low-refractive-index layer. The first high-refractive-index layer has a plurality of first microstructures on a first textured surface facing the first low-refractive-index layer. The plurality of first microstructures define a plurality of recessed spaces, and the first low-refractive-index layer fills the plurality of said recessed spaces, wherein the first low-refractive-index layer forms a cavity or has a porous structure within at least one of the first microstructures. Each first microstructure includes at least two first inclined planes. Two opposing first inclined planes together form a first included angle, and the first included angle satisfies the following relationship with the refractive indices of the first high-refractive-index layer and the first low-refractive-index layer: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, θ1 is the first included angle, n H1 Let n be the refractive index of the first high refractive index layer, and n be the refractive index of the first high refractive index layer. L1 The effective refractive index of the first low refractive index layer is between 1 and the theoretical refractive index of the material of the first low refractive index layer.

[0010] One object of the present invention is to provide an optical compensation film comprising a substrate, a first optical structure, and a second optical structure. The first optical structure is located on one side of the substrate and includes a first high-refractive-index layer and a first low-refractive-index layer. The first high-refractive-index layer is located downstream of the optical path of the first low-refractive-index layer. The first high-refractive-index layer has a plurality of first microstructures on a first textured surface facing the first low-refractive-index layer, each first microstructure including at least two first bevels. The second optical structure is located on the other side of the substrate and includes a second high-refractive-index layer and a second low-refractive-index layer. The second high-refractive-index layer is located downstream of the optical path of the second low-refractive-index layer. The second low-refractive-index layer has a plurality of second microstructures on a second textured surface facing the second high-refractive-index layer, each second microstructure including at least two second bevels. The tilt direction of each second bevel is different from the tilt direction of any one of the first bevels. The two first bevels together form a first included angle, and the first included angle satisfies the following relationship with the refractive indices of the first high-refractive-index layer and the first low-refractive-index layer: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, θ1 is the first included angle, n H1 Let n be the refractive index of the first high refractive index layer, and n be the refractive index of the first high refractive index layer. L1 is the refractive index of the first low-refractive-index layer.

[0011] One of the beneficial effects of the present invention is that the optical compensation film provided by the present invention can achieve the following: "the first high refractive index layer is located downstream of the first low refractive index layer in the optical path" and "two opposing first inclined surfaces of each first microstructure jointly form a first included angle θ1, the first included angle θ1 being equal to the refractive index n of the first high refractive index layer". H1 and the refractive index n of the first low-refractive-index layer L1 The following relationship is satisfied between them: |θ1-(180-2*(arcsin(n) L1 / n H1 The technical solution of 180 / π)|≤10” can reduce the color shift of images at wide viewing angles, thereby improving the quality of displayed images.

[0012] The advantages of this invention compared to the prior art have been described in the foregoing objectives. Those skilled in the art will further understand the other benefits and objectives of the invention as defined in the claims after reading the specification. To enable a further understanding of the features and technical content of this invention, please refer to the following detailed description and drawings of the invention. However, the provided drawings are for reference and illustration only and are not intended to limit the invention. Attached Figure Description

[0013] The optical compensation film of the present invention will be described in detail below with reference to the preferred embodiment and accompanying drawings. The drawings are not necessarily drawn to scale, therefore the present invention is not limited to the scale shown in the drawings. In the drawings:

[0014] Figure 1 This is a cross-sectional schematic diagram of the light-emitting module according to the first embodiment of the present invention;

[0015] Figure 2 This is a partial three-dimensional exploded view of the optical compensation film according to the first embodiment of the present invention;

[0016] Figure 3 for Figure 2 A partial three-dimensional exploded view of the optical compensation film from another angle;

[0017] Figure 4 This is a partial three-dimensional exploded view of an optical compensation film according to another embodiment of the present invention;

[0018] Figure 5 This is a partial three-dimensional schematic diagram of the first high refractive index layer according to another embodiment of the present invention;

[0019] Figure 6 This is a partial three-dimensional schematic diagram of the first high refractive index layer according to another embodiment of the present invention;

[0020] Figure 7 for Figure 6 A schematic diagram of the bottom view of the first high refractive index layer;

[0021] Figure 8 This is a cross-sectional schematic diagram of the light-emitting module according to the second embodiment of the present invention;

[0022] Figure 9 for Figure 8 A partial three-dimensional schematic diagram of the optical compensation film;

[0023] Figure 10 This is a cross-sectional schematic diagram of the light-emitting module according to the third embodiment of the present invention;

[0024] Figure 11 This is a cross-sectional schematic diagram of the light-emitting module according to the fourth embodiment of the present invention;

[0025] Figure 12 for Figure 11 A partial three-dimensional exploded view of the optical compensation film;

[0026] Figure 13 This is a partial three-dimensional exploded view of an optical compensation film according to another embodiment of the present invention;

[0027] Figure 14 This is a partial three-dimensional exploded view of an optical compensation film according to another embodiment of the present invention;

[0028] Figure 15 This is a partial three-dimensional exploded view of an optical compensation film according to another embodiment of the present invention;

[0029] Figure 16 for Figure 15 A three-dimensional schematic diagram of the first high refractive index layer;

[0030] Figure 17 for Figure 16 A top view of the first high refractive index layer;

[0031] Figure 18 for Figure 17 A schematic cross-section of the first high refractive index layer along line AA;

[0032] Figure 19 This is a partial top view of the first high refractive index layer according to another embodiment of the present invention;

[0033] Figure 20 This is a partial top view of the first high refractive index layer according to another embodiment of the present invention;

[0034] Figure 21 This is a partial top view of the first high refractive index layer according to another embodiment of the present invention; and

[0035] Figure 22 This is a cross-sectional schematic diagram of the light-emitting module according to the fifth embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures

[0037] M1~M5: Light-emitting modules

[0038] 1: Light-emitting components

[0039] 2,2A~2G: Optical compensation film

[0040] 20: Substrate

[0041] 20a: First side

[0042] 20b: Second side

[0043] 21: First optical structure

[0044] 210: First high refractive index layer

[0045] 210S: First textured surface

[0046] 210L, 210L': First boundary line

[0047] 210A, 210A': First microstructure

[0048] S1: First inclined plane

[0049] θ1: First included angle

[0050] 210h: Gap

[0051] 210R: First convex ridge line

[0052] 210r: First concave ridge line

[0053] 21H: Cavity

[0054] 211: First low-refractive-index layer

[0055] 211A: Protruding microstructure

[0056] 22: Adhesive layer

[0057] W1: Line width

[0058] P1: First spacing

[0059] 20R, 23R: Matte finish

[0060] 23: Second optical structure

[0061] 230: Second Highest Refractive Index Layer

[0062] 230A: Protruding microstructure

[0063] 231: Second low-refractive-index layer

[0064] 231S: Second Textured Surface

[0065] 231A: Second microstructure

[0066] 231L: Second Boundary Line

[0067] P2: Second spacing

[0068] S2: Second inclined plane

[0069] θ2: Second included angle

[0070] D1: First Direction

[0071] D2: Second Direction

[0072] D3: Thickness direction

[0073] d1, d2: Depth

[0074] P11, P12: Spacing Detailed Implementation

[0075] The following specific embodiments illustrate the implementation of the "optical compensation film" 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 the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. 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. Furthermore, the term "or" as used herein may include, depending on the actual situation, any combination of any one or more of the associated listed items.

[0076] Please refer to Figure 1 This image shows a cross-sectional schematic diagram of a light-emitting module according to an embodiment of the present invention. The light-emitting module M1 of this embodiment can be applied to a display device or a lighting device. The aforementioned display device or lighting device can also be a flexible display device or lighting device. The light-emitting module M1 may include a light-emitting component 1 and an optical compensation film 2. The light-emitting component 1 may include multiple light-emitting units, and the multiple light-emitting units are arranged in an array to generate a point light source or a line light source. In one embodiment, each light-emitting unit is, for example, an organic light-emitting diode (OLED).

[0077] The optical compensation film 2 can be disposed on the light-emitting side of the light-emitting component 1, and includes at least a substrate 20 and a first optical structure 21. Using the optical compensation film 2 of this embodiment, color shift of the displayed image from the display device or lighting device at a wide viewing angle can be reduced, thus improving image display quality. It should be noted that... Figure 1 In this embodiment, the optical compensation film 2 is directly disposed on the light-emitting surface of the light-emitting component 1. However, in other embodiments, other optical film layers may be disposed between the optical compensation film 2 and the light-emitting component 1, depending on the actual application.

[0078] The substrate 20 has a first side 20a and a second side 20b opposite to each other. In this embodiment, the material constituting the substrate 20 may be polyethylene terephthalate (PET), polystyrene (PS), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylic (PMMA), acrylic (MMA), etc.

[0079] In this embodiment, the first optical structure 21 includes a first high refractive index layer 210 and a first low refractive index layer 211. The first high refractive index layer 210 and the first low refractive index layer 211 are located on either a first side 20a or a second side 20b of the substrate 20. In this embodiment, the first side 20a of the substrate 20 faces the light-emitting component 1, while the second side 20b faces away from the light-emitting component 1. The first high refractive index layer 210 and the first low refractive index layer 211 are located on the first side 20a of the substrate 20, and the first high refractive index layer 210 is located downstream of the optical path of the first low refractive index layer 211. That is, the light beam generated by the light-emitting component 1 will first pass through the first low refractive index layer 211 and then through the first high refractive index layer 210, without total internal reflection. The first high refractive index layer 210 may also be made of the same material as the substrate 20.

[0080] Please refer to Figure 1 and Figure 2 , Figure 2 This is a partially exploded perspective view of the optical compensation film of the first embodiment of the present invention, omitting the adhesive layer. The first high-refractive-index layer 210 has a first textured surface 210S facing the first low-refractive-index layer 211 and a flat surface (not labeled) facing the substrate 20. The first textured surface 210S has multiple intersecting first boundary lines 210L. For example... Figure 2 As shown, a portion of the first boundary line 210L extends along a first direction D1, and another portion extends along a second direction D2, where the second direction D2 is not parallel to the first direction D1. Multiple first boundary lines 210L intersect to define multiple first regions (unlabeled). Each first region has a polygonal outline, and each first region forms a first microstructure 210A. In other words, every two adjacent first microstructures 210A are connected to one of the first boundary lines 210L.

[0081] The first microstructure 210A in this embodiment includes a plurality of first inclined surfaces S1 that are inclined relative to the thickness direction D3 of the substrate 20, and the first microstructure 210A can be a convex microstructure or a concave microstructure. Specifically, when the first microstructure 210A is a convex microstructure, the first microstructure 210A bulges outward relative to the first boundary line 210L to which it is connected, in a direction away from the substrate 20. When the first microstructure 210A is a concave microstructure, the first microstructure 210A is concave inward relative to the first boundary line 210L to which it is connected, in a direction closer to the substrate 20. By making each first microstructure 210A have a plurality of first inclined surfaces S1 that are inclined in different directions, the light beam emitted by the light-emitting unit of the light-emitting component 1 will be dispersed by the first microstructure 210A when passing through the optical compensation film 2, and then remixed in the substrate 20, which can reduce the angular deviation at a large viewing angle.

[0082] Furthermore, the shape of the first microstructure 210A can be a convex pyramid, a convex prism, a concave pyramid, or a concave prism. In this embodiment, the first microstructure 210A is a concave pyramid. More specifically, the first microstructure 210A is a concave pyramid shape. Accordingly, the first microstructure 210A includes three or four first inclined surfaces S1 oriented in different directions, and each first inclined surface S1 is a triangle.

[0083] It should be noted that the design concept of the optical compensation film 2 in this embodiment of the invention differs from the design concept of other optical films used in light amplification. According to actual test results, if the light beam generated by the light-emitting component 1 undergoes total internal reflection within the first optical structure 21, severe color shift will occur at a relatively small viewing angle (i.e., 0 degrees to 5 degrees), and the displayed image will also exhibit ghosting, affecting image quality. The viewing angle referred to in this invention is defined as the angle between the viewing line of sight and the normal to the light-emitting surface of the light-emitting component 1.

[0084] Therefore, in this embodiment, the light beam generated by the light-emitting component 1 first passes through the first low-refractive-index layer 211 and then through the first high-refractive-index layer 210, which can avoid total internal reflection of the light beam from the light-emitting component 1 when passing through the first optical structure 21, thereby avoiding color shift and ghosting at small viewing angles. In addition, by making each first microstructure 210A have multiple first inclined surfaces S1 extending in different directions, the different colored lights generated by the multiple light-emitting units in the light-emitting component 1 can be dispersed by the multiple first microstructures 210A and remixed in the substrate 20, which can further reduce color shift when viewing the displayed image at a larger viewing angle (greater than 60 degrees).

[0085] like Figure 1 and Figure 2 As shown, in this embodiment, a first included angle θ1 is formed between two opposing first inclined planes S1, and the first included angle θ1 can satisfy the following relationship: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, where θ1 is the first included angle, n H1 Let n be the refractive index of the first high refractive index layer, and n be the refractive index of the first high refractive index layer. L1 The refractive index is the first low-refractive-index layer 211.

[0086] It should be noted that, since ambient light enters the first optical structure 21 from the substrate 20, it first passes through the first high refractive index layer 210 and then enters the first low refractive index layer 211. Therefore, ambient light may be totally internally reflected, thus reducing the transmittance of the optical compensation film 2. The critical angle θc for total internal reflection when light enters the first low refractive index layer 211 from the first high refractive index layer 210, the refractive index of the first high refractive index layer 210, and the refractive index of the first low refractive index layer 211 satisfy the following relationship: θc=(arcsin(n L1 / n H1 )*(180 / π). Therefore, the above relationship can also be expressed as: |(θ1-(180-2θc)|≤10.

[0087] The optical compensation film 2 was tested using a light-emitting component 1 containing organic light-emitting diodes, and the results were observed with the naked eye. Actual testing showed that when (θ1 - (180 - 2θc)) < (-10), color shift occurred within a 5-degree viewing angle. For example, white displayed in the image would appear as dark green. Furthermore, when 10 < (θ1 - (180 - 2θc)), almost no color shift occurred at viewing angles less than or equal to 45 degrees. While color shift was still observable at viewing angles exceeding 45 degrees, its degree was reduced. For example, at viewing angles exceeding 45 degrees, white in the displayed image appeared as light green to the naked eye.

[0088] However, when -10 ≤ (θ1 - (180 - 2θc)) ≤ 10, it has a more significant effect on improving color shift in displayed images at larger viewing angles (above 45 degrees). Even when the viewing angle exceeds 80 degrees, almost no color shift occurs. Therefore, by ensuring that the first included angle θ1 satisfies the following relationship, i.e., |θ1 - (180 - 2θc)| ≤ 10, a significant and substantial effect can be achieved. More preferably, when |θ1 - (180 - 2θc)| ≤ 5, it has an even better effect on improving color shift.

[0089] Furthermore, in this embodiment, the first included angle θ1 is made to conform to the following relationship: (180-2*(arcsin(n L1 / n H1 (180-2θc)<θ1 (that is, (180-2θc)<θ1), which can also make the optical compensation film 2 have relatively good light transmittance as much as possible. In other words, when 0<(θ1-(180-2θc))≤10, the optical compensation film 2 not only effectively improves the color shift phenomenon of the displayed image at a large viewing angle, but also does not sacrifice the light transmittance of the optical compensation film 2.

[0090] In one embodiment, the refractive index n of the first low-refractive-index layer 211 L1 The refractive index n of the first high refractive index layer 210 H1 The ratio between (n) L1 / n H1 The range is between 0.8 and 0.95. The refractive index n of the first low-refractive-index layer 211 is... L1 The refractive index n of the first high refractive index layer 210 H1 Both are greater than 1, and the refractive index n of the first high refractive index layer 210 is greater than 1. H1 The refractive index n is greater than that of the first low-refractive-index layer 211. L1Therefore, the critical angle θc for total internal reflection is between 53 and 72 degrees, and the first included angle θ1 is between 36 and 74 degrees. Further considering manufacturing limitations, the first included angle θ1 is between 40 and 74 degrees.

[0091] In a preferred embodiment, the first high refractive index layer 210 may be selected to have a refractive index n. H1 The material is between 1.58 and 1.7. The first high refractive index layer 210 is a photocurable layer, such as polymethyl methacrylate (PMMA). Additionally, the first low refractive index layer 211 can be selected with a refractive index n. L1 The material is between 1.4 and 1.5. The first low refractive index layer 211 can be a soft adhesive layer or a cured layer formed by UV curing or heat curing.

[0092] Please refer to the following: Figures 1 to 3 In this embodiment, the first low-refractive-index layer 211 is a photocurable layer, and a portion of the first low-refractive-index layer 211 fills the recessed spaces defined by the plurality of first microstructures 210A. For example... Figure 3 As shown, the first low-refractive-index layer 211 has multiple protruding microstructures 211A on its surface facing the first high-refractive-index layer 210, the shapes of which can respectively cooperate with the multiple first microstructures 210A. Since the shape of the first microstructure 210A in this embodiment is a concave pyramid shape and the shape of the protruding microstructure 211A is a convex pyramid shape, the present invention is not limited thereto.

[0093] Reference Figure 1 In this embodiment, the optical compensation film 2 further includes an adhesive layer 22. The adhesive layer 22 is attached to the surface of the first low refractive index layer 211. The optical compensation film 2 can be bonded to the light-emitting surface of the light-emitting component 1 through the adhesive layer 22.

[0094] In another embodiment, the first high-refractive-index layer 210 is a curing layer, while the first low-refractive-index layer 211 is a flexible adhesive layer. The flexible adhesive layer can be an optical clear adhesive (OCA) with a low refractive index, such as silicone. For example, the refractive index of the flexible adhesive layer can be less than or equal to 1.41. Furthermore, the peel strength of the flexible adhesive layer is at least 10 N / 25 mm. Accordingly, the optical compensation film 2 of this embodiment can omit the adhesive layer 22 and can be directly bonded to the light-emitting component 1 through the first low-refractive-index layer 211.

[0095] When the first low-refractive-index layer 211 is a soft adhesive layer, a UV-curable layer, or a heat-curable layer, multiple air bubbles can be selectively generated inside the first low-refractive-index layer 211 after its formation, giving it a porous structure. Although the multiple air bubbles inside the first low-refractive-index layer 211 may slightly reduce the transparency of the optical compensation film 2, they do not affect the effect of the optical compensation film 2 in improving color shift.

[0096] It should be noted that in the above relation |θ1-(180-2*(arcsin(n) L1 / n H1 In the case where )*180 / π))|≤10, n L1 It is the equivalent refractive index of the first low-refractive-index layer 211 containing bubbles. Due to the presence of bubbles, the equivalent refractive index n L1 In reality, the refractive index will be greater than 1 but less than the theoretical refractive index of the material of the first low-refractive-index layer 211. The material of the first low-refractive-index layer 211 is, for example, a soft adhesive layer, a UV-curable layer, or a heat-curable layer. For instance, assuming the theoretical refractive index of the material of the first low-refractive-index layer 211 is 1.41, the equivalent refractive index n of the first low-refractive-index layer 211 containing bubbles... L1 It will be between 1 and 1.41, that is, 1. <n L1 <1.41, varying depending on the volume ratio of the bubbles. Furthermore, assuming the refractive index of the first high-refractive-index layer 210 is 1.68, according to the aforementioned relationship, the first included angle θ1 will be between 80 degrees and 120 degrees, preferably between 85 and 100 degrees.

[0097] Please refer to Figure 4 This image shows a partial exploded perspective view of an optical compensation film according to another embodiment of the present invention. In this embodiment, the first microstructure 210A of the first high refractive index layer 210 is convex pyramidal in shape, that is, it protrudes away from the substrate 20 relative to the first boundary line 210L. Accordingly, the surface of the first low refractive index layer 211 has a recessed microstructure, and the recessed microstructure is recessed pyramidal in shape.

[0098] Please refer to the following: Figure 1 and Figure 5 ,in, Figure 5 A partial perspective view of the first high refractive index layer according to another embodiment of the present invention is shown. Figure 5When the first high refractive index layer 210 is disposed on the substrate 20, the first high refractive index layer 210 is disposed with its first textured surface 210S facing away from the substrate 20. In this embodiment, the first microstructure 210A is a recessed microstructure. Each first boundary line 210L is a wavy boundary line, and the wavy boundary line undulates up and down in the thickness direction D3 of the first high refractive index layer 210. Furthermore, in this embodiment, the first boundary line 210L undulates periodically. In addition, the wavelength of the first boundary line 210L extending in the first direction D1 corresponds to one first microstructure 210A. Similarly, the wavelength of the first boundary line 210L extending in the second direction D2 also corresponds to one first microstructure 210A. However, the present invention does not limit the dimensional relationship between the wavelength of the first boundary line 210L and the first microstructure 210A.

[0099] It should be noted that the multiple light-emitting units of the light-emitting component 1 are usually arranged in an array. Since the multiple first boundary lines 210L are wavy boundary lines, the light beam of the sub-pixel can have different reflection and refraction angles after passing through the first microstructure 210A of the first optical structure 21, avoiding the generation of moiré patterns in the displayed image and improving image quality.

[0100] Please refer to Figure 6 and Figure 7 A partial perspective view and a bottom view of the first high refractive index layer according to another embodiment of the present invention are shown. In this embodiment, the first boundary line 210L of the first high refractive index layer 210 is also a wavy boundary line. Compared to Figure 5 In this embodiment, the first high-refractive-index layer 210 has a waveform with a relatively long wavelength for its first boundary line 210L. In other words, in this embodiment, the wavelength of the first boundary line 210L extending in the first direction D1 (or the second direction D2) can correspond to several first microstructures 210A arranged in the first direction D1 (or the second direction D2). Furthermore, in this embodiment, multiple gaps 210h are formed at the intersection of one of the first boundary lines 210L extending along the first direction D1 and another of the first boundary lines 210L extending along the second direction D2.

[0101] In this embodiment, the plurality of first microstructures 210A are convex microstructures. Additionally, please refer to... Figure 7The multiple first microstructures 210A do not necessarily have the same shape. That is, some first microstructures 210A and other first microstructures 210A' may have different shapes, sizes, or surface profiles. In this embodiment, some first microstructures 210A have a convex pyramidal shape, while other first microstructures 210A' have a convex prism shape. The aforementioned convex prism can be a triangular prism or a square prism. In addition, the first microstructures 210A, 210A' with different shapes, sizes, or surface profiles are randomly distributed, and at least two adjacent first microstructures 210A, 210A' have different shapes, sizes, or surface profiles.

[0102] Compared to the previous embodiment, the first textured surface 210S of this embodiment also has multiple notches 210h located at the intersection of multiple first boundary lines 210L, and multiple first microstructures 210A, 210A' with different shapes are randomly distributed above the light-emitting component 1, which has a better effect on suppressing moiré patterns in the displayed image and further improves the image quality.

[0103] It should be noted that the wavy first boundary line 210L can also meander horizontally, which can also achieve the effect of suppressing moiré patterns in the displayed image.

[0104] Please refer to Figure 8 as well as Figure 9 , Figure 8 This is a partial cross-sectional schematic diagram of a light-emitting module according to another embodiment of the present invention. Figure 9 for Figure 8 A partial three-dimensional schematic diagram of the optical compensation film. Components of the light-emitting module M2 in this embodiment that are the same as or similar to those of the light-emitting module M1 in the previous embodiment have the same or similar reference numerals, and will not be described again.

[0105] In one embodiment of the optical compensation film 2A, the first high-refractive-index layer 210 is a curing layer, while the first low-refractive-index layer 211 is a flexible adhesive layer. As mentioned earlier, the material of the flexible adhesive layer can be an optical clear adhesive (OCA) with a low refractive index, such as silicone, but the invention is not limited thereto. For example, the refractive index of the flexible adhesive layer can be less than or equal to 1.41. In addition, the peel strength of the flexible adhesive layer is at least 10 N / 25 mm. Accordingly, the optical compensation film 2A can omit the other adhesive layer and can be directly bonded to the light-emitting component 1 through the first low-refractive-index layer 211.

[0106] It should be noted that, compared to using a photocurable or thermocurable layer as the first low-refractive-index layer 211, using a soft adhesive layer as the first low-refractive-index layer 211 provides the optical compensation film 2A with better reliability. Specifically, because the soft adhesive layer is soft and deformable, it can prevent the first high-refractive-index layer 210 and the soft adhesive layer from separating due to internal stress caused by the difference in their coefficients of thermal expansion when there are significant changes in ambient temperature. Therefore, the optical compensation film 2A of this embodiment can be used in more demanding working environments.

[0107] like Figure 8 As shown, the multiple first microstructures 210A are recessed microstructures, defining multiple recessed spaces. In this embodiment, the first low-refractive-index layer 211 does not completely fill each recessed space. In other words, the first low-refractive-index layer 211 only partially fills each recessed space, forming a cavity 21H at the bottom of the first microstructure 210A. Accordingly, multiple cavities 21H are formed between the first low-refractive-index layer 211 and the first high-refractive-index layer 210, and the cavities 21H are filled with air.

[0108] In this embodiment, the first optical structure 21 of the optical compensation film 2A has multiple cavities 21H. Therefore, compared to the previous embodiment, the light beam generated by the light-emitting component 1 is refracted more times when passing through the first optical structure 21, giving the optical compensation film 2A better light diffusion performance, but relatively lower transparency. However, in the first microstructure 210A of this embodiment, the first included angle θ1 of the two first inclined planes S1 and the critical angle of total internal reflection θc satisfy the relationship: |θ1-(180-2θc)|≤10, making the optical compensation film 2A usable for improving color shift. Accordingly, the optical compensation film 2A of this embodiment can be applied to organic light-emitting diode lighting devices. After actual testing, after applying the optical compensation film 2A of this embodiment to an organic light-emitting diode display device or lighting device, no color shift was observed by the naked eye when the viewing angle exceeded 80 degrees.

[0109] As mentioned above, due to the presence of cavity 21H, the equivalent refractive index n of the first low-refractive-index layer 211 is... L1 In practice, it will be less than its theoretical material value. For example, assuming the first low-refractive-index layer 211 is a soft adhesive layer with a theoretical refractive index of 1.41, then the equivalent refractive index n of the first low-refractive-index layer 211 containing bubbles will be less than its theoretical material value. L1 It will be between 1 and 1.41, that is, 1. <n L1<1.41, varying depending on the volume percentage of cavity 21H. Furthermore, assuming the refractive index of the first high-refractive-index layer 210 is 1.68, according to the aforementioned relationship, the first included angle θ1 will be between 80 degrees and 120 degrees, preferably 85 to 100 degrees.

[0110] Please refer to Figure 8 and Figure 9 In this embodiment, each first boundary line 210L of the first high refractive index layer 210 has a linewidth W1, and there is a first spacing P1 between two adjacent first boundary lines 210L. Unlike the previous embodiment, the linewidth W1 of the first boundary line 210L in this embodiment can be greater than or equal to 0.05 times the first spacing P1, but less than or equal to 0.2 times the first spacing P1, that is, satisfying the following relationship: 0.05P1≤W1≤0.2P1. In one embodiment, the range of the first spacing P1 is 20μm to 30μm. When the first spacing P1 is 20μm, the range of the linewidth W1 is 1μm to 4μm.

[0111] It should be noted that, in Figure 1 In one embodiment, the line width W1 of the first boundary line 210L is approximately 0.02 times the first spacing P1. However, compared to Figure 1 In this embodiment, the first high refractive index layer 210 is in contact with both air and the first low refractive index layer 211. When the optical compensation film 2A is applied in an environment with large temperature variations, the internal stress caused by the difference in thermal expansion coefficients may affect the bonding strength between the first high refractive index layer 210 and the first low refractive index layer 211. Therefore, by making the linewidth W1 of the first boundary line 210L greater than or equal to 0.05 times the first spacing P1, the bonding area between the first low refractive index layer 211 and the first high refractive index layer 210 can be increased, thereby enhancing the bonding strength between them and improving the reliability of the first optical structure 21.

[0112] Furthermore, by making the linewidth W1 of the first boundary line 210L less than or equal to 0.2 times the first spacing P1, the effect of the optical compensation film 2A on color shift improvement can be avoided. The first boundary line 210L can have a flat surface or a curved surface. In addition, as described in the previous embodiments, the first boundary line 210L in this embodiment can also be a wavy boundary line.

[0113] Please refer to Figure 10In the light-emitting module M3 of this embodiment, the substrate 20 of the optical compensation film 2B may have a matte structure 20R on the surface opposite to the first high refractive index layer 210. That is, the matte structure 20R is located on the second side 20b of the substrate 20. The haze of the matte structure 20R ranges from 5% to 95%. The matte structure 20R can reduce surface reflection and increase the luminance of the optical compensation film 2. It should be noted that the higher the haze of the matte structure 20R, the lower the resolution of the displayed image. Accordingly, when the light-emitting module M3 is applied in a display device, the haze range of the matte structure 20R is preferably less than 30% to avoid affecting the resolution of the displayed image. When the light-emitting module M3 is applied in a lighting device, the haze of the matte structure 20R can be greater than or equal to 30%, which can improve the luminance of the optical compensation film 2.

[0114] The matte structure 20R is formed by roughening the surface of the substrate 20 and / or the flat surface of the first low-refractive-index layer 211. In another embodiment, the surfaces of the substrate 20 and / or the first low-refractive-index layer 211 can be made highly rough during the fabrication of the substrate 20 or the first low-refractive-index layer 211. In another embodiment, a diffusion particle layer can be coated on the surface of the substrate 20 and / or the first low-refractive-index layer 211 to form the matte structure 20R. Accordingly, the present invention does not limit the manner in which the matte structure 20R is formed.

[0115] Please refer to Figure 11 and Figure 12 In this embodiment, the light-emitting module M4 has the same or similar reference numerals as the light-emitting module M1 in the first embodiment, and will not be described again. In this embodiment, the optical compensation film 2C further includes a second optical structure 23, and the second optical structure 23 and the first optical structure 21 are located on opposite sides of the substrate 20, respectively.

[0116] The second optical structure 23 of this embodiment is located on the second side 20b of the substrate 20 and includes a second high refractive index layer 230 and a second low refractive index layer 231. The second low refractive index layer 231 is located between the substrate 20 and the second high refractive index layer 230. Accordingly, for the light beam generated by the light-emitting component 1, the second high refractive index layer 230 is located downstream of the light path of the second low refractive index layer 231. After the light beam generated by the light-emitting component 1 enters the second optical structure 23, it first passes through the second low refractive index layer 231 and then through the second high refractive index layer 230, without total internal reflection occurring within the second optical structure 23.

[0117] In this embodiment, the second low-refractive-index layer 231 can be selected to have a refractive index n L2 The material has a refractive index between 1.4 and 1.5, and the second low-refractive-index layer 231 is, for example, a cured layer formed by ultraviolet light or heat curing. The second high-refractive-index layer 230 may be selected with a refractive index n.H2 The material is between 1.58 and 1.7, and the second high refractive index layer 230 can be a soft adhesive layer or a cured layer formed by UV curing or heat curing. When the second high refractive index layer 230 is a soft adhesive layer (such as optical adhesive), it may contain nano-zirconia, making the refractive index of the soft adhesive layer greater than or equal to 1.60.

[0118] Please refer to Figure 11 The second low-refractive-index layer 231 has a second textured surface 231S facing the second high-refractive-index layer 230. The second textured surface 231S has a plurality of second microstructures 231A. Specifically, the second textured surface 231S has a plurality of second boundary lines 231L defining a plurality of second regions, and each of the plurality of second regions has a plurality of second microstructures 231A formed thereon. It is worth noting that in this embodiment, the second spacing P2 between any two adjacent second boundary lines 231L is different from the first spacing P1 between any two adjacent first boundary lines 210L. In other words, the size of the first microstructure 210A is different from the size of the second microstructure 231A. This avoids moiré patterns in the displayed image, improving image quality.

[0119] Please refer to Figure 12 In this embodiment, multiple second boundary lines 231L intersect each other to define multiple second regions. The extension direction of a portion of the second boundary lines 231L (first direction D1) is not parallel to the extension direction of another portion of the second boundary lines 231L (second direction D2). It is worth noting that the extension direction of the second boundary lines 231L can also differ from the extension direction of the first boundary line 210L to avoid moiré patterns.

[0120] The second microstructure 231A is a recessed microstructure, meaning it is recessed towards the substrate 20 relative to the second boundary line 231L. Each second microstructure 231A may include multiple second inclined surfaces S2, each second inclined surface S2 being inclined relative to the thickness direction D3 of the second low-refractive-index layer 231. Please refer to [further details omitted]. Figure 11 The second included angle θ2 formed between the two opposing second inclined planes S2 can satisfy the following relationship: |θ2-(180-2*arcsin(n L2 / n H2 )*180 / π)|≤10, where θ2 is the second included angle, n H2 Where n is the refractive index of the second highest refractive index layer, and n is the refractive index of the second highest re L2 The refractive index of the second low-refractive-index layer 231.

[0121] The critical angle θc' for total internal reflection of ambient light entering the second low-refractive-index layer 231 from the second high-refractive-index layer 230, the refractive index of the second high-refractive-index layer 230, and the refractive index of the second low-refractive-index layer 231 can satisfy the following relationship: θc'=(arcsin(n L2 / n H2 (180 / π). Accordingly, in this embodiment, the relationship between the second included angle θ2 and the critical angle of total internal reflection θc' can also be expressed as: |θ2-(180-2θc')|≤10, preferably |θ2-(180-2θc')|≤5, which can reduce the color shift phenomenon of the displayed image at large viewing angles (above 60 degrees).

[0122] In this way, total internal reflection of ambient light entering through the surface of the second high-refractive-index layer 230 can be minimized, thus reducing the transmittance of the optical compensation film 2C. In other words, the optical compensation film 2C provided in this embodiment of the invention not only improves color shift of the displayed image at wide viewing angles but also allows the optical compensation film 2 to maintain the required transmittance. Furthermore, the refractive index n of the second low-refractive-index layer 231... L2 The refractive index n of the second high refractive index layer 230 H2 The ratio between (n) L2 / n H2 The range is between 0.8 and 0.95.

[0123] Additionally, in a preferred embodiment, the refractive index n of the first high refractive index layer 210 is... H1 The refractive index n of the first low-refractive-index layer 211 L1 The difference ΔN1 between them will be greater than the refractive index n of the second high refractive index layer 230. H2 The refractive index n of the second low-refractive-index layer 231 L2 The difference between them is ΔN2, meaning ΔN1 > ΔN2. Thus, by reducing the difference ΔN2, the transparency of the optical compensation film 2C can be further improved.

[0124] Each second microstructure 231A can be a concave pyramid or a concave prism, such as a concave pyramid, a concave triangular prism, or a concave quadrangular prism, and has multiple second inclined surfaces S2 tilted in different directions, but the invention is not limited thereto. The second high-refractive-index layer 230 is a photocurable layer, and a portion of the second high-refractive-index layer 230 fills the recessed spaces defined by the multiple second microstructures 231A. Figure 12 As shown, the second high-refractive-index layer 230 has multiple protruding microstructures 230A on its surface facing the second low-refractive-index layer 231, the shapes of which can respectively cooperate with the multiple second microstructures 231A. Since the shape of the second microstructure 231A in this embodiment is a concave pyramid shape and the shape of the protruding microstructure 230A is a convex pyramid shape, the present invention is not limited thereto.

[0125] In one embodiment, the second high-refractive-index layer 230 may form a cavity or have a porous structure within the recessed space defined by the second microstructure 231A. In this case, the above relationship |θ2-(180-2*arcsin(n)| becomes valid. L2 / n H2 In the case where n ≤ 10, n H2 It is the equivalent refractive index of the second high refractive index layer 230, and it lies between 1 and the theoretical refractive index of the material of the second high refractive index layer 230.

[0126] Please refer to Figure 13 This image shows a partial exploded perspective view of an optical compensation film according to another embodiment of the present invention. The 2D view of the optical compensation film in this embodiment is shown in the image. Figure 12 The difference in the optical compensation film 2C shown is that, in the second optical structure 23 of this embodiment, the multiple second boundary lines 231L of the second low-refractive-index layer 231 all extend along the same direction (first direction D1). Each second microstructure 231A is elongated and has two second inclined surfaces S2. In this embodiment, each second microstructure 231A is a convex prism, that is, it protrudes from the second boundary line 231L in a direction away from the substrate 20. Furthermore, Figure 13 The first optical structure 21 and the second optical structure 23 shown can also be interchanged.

[0127] Please refer to Figure 14 In the optical compensation film 2E of this embodiment, the second optical structure 23 and Figure 12 The embodiments shown are the same and will not be described again here. In this embodiment, the multiple first boundary lines 210L of the first high refractive index layer 210 extend along the same direction (second direction D2), and each first microstructure 210A is a convex prism.

[0128] Please refer to Figure 15 In the optical compensation film 2F of this embodiment, multiple second boundary lines 231L of the second low-refractive-index layer 231 extend along the first direction D1, and the second microstructure 231A is also a protruding pillar extending along the first direction D1. Furthermore, multiple first boundary lines 210L of the first high-refractive-index layer 210 extend along the second direction D2, and the first microstructure 210A is a protruding pillar extending along the second direction D2. That is, the extension direction of the first boundary lines 210L is different from the extension direction of the second boundary lines 231L. Accordingly, the vertical projection of the second microstructure 231A intersects with the first microstructure 210A. The tilt direction of the second inclined surface S2 of each second microstructure 231A is different from the tilt direction of any first inclined surface S1.

[0129] Thus, when the optical compensation film 2F of this embodiment is applied to a display device or lighting device, it has the effect of improving color shift. Furthermore, at least one of the first boundary line 210L and the second boundary line 231L is wavy. In this embodiment, the plurality of first boundary lines 210L of the first high refractive index layer 210 are wavy, while the plurality of second boundary lines 231L are straight. In other embodiments, both the first boundary line 210L and the second boundary line 231L are wavy. The wavy shape of the first boundary line 210L and / or the second boundary line 231L can prevent moiré patterns from appearing in the displayed image.

[0130] Furthermore, in the first microstructure 210A, the first included angle θ1 between the two first inclined planes S1 and the critical angle of total internal reflection θc satisfy the relationship |θ1-(180-2θc)|≤10; or, in the second microstructure 231A, the second included angle θ2 between the two second inclined planes S2 and the critical angle of total internal reflection θc' satisfy the relationship |θ2-(180-2θc')|≤10. Therefore, the effect of the optical compensation film 2F in improving color shift can be significantly enhanced.

[0131] The following section uses the first high-refractive-index layer 210 as an example to illustrate different implementations. Please refer to... Figure 16 , picture Figure 15 A three-dimensional schematic diagram of the first high-refractive-index layer. In this embodiment, each first microstructure 210A is elongated and convex outward relative to the first boundary line 210L. Each first microstructure 210A also has a first convex ridge 210R extending along the first boundary line 210L.

[0132] Please refer to Figure 17 ,for Figure 16 A top view of the first high-refractive-index layer. In this embodiment, the first convex ridge 210R is a wavy ridge, and the first convex ridge 210R meanders left and right relative to the first boundary line 210L in a direction parallel to the surface. In other words, the spacing between adjacent first convex ridges 210R and the first boundary line 210L in the first direction D1 changes with the position of the first convex ridge 210R. Furthermore, the ridge spacing between two adjacent first convex ridges 210R also changes with the position of the first convex ridge 210R. More specifically, the ridge spacing is a function of the position of the first convex ridge 210R in the second direction D2.

[0133] Please refer to the following: Figure 16 and Figure 17 In this embodiment, the first spacing P1 between two adjacent first boundary lines 210L will remain consistent with the position of the first microstructure 210A in the second direction D2, but the first boundary line 210L fluctuates up and down in the thickness direction D3 of the first high refractive index layer 210.

[0134] Please refer to Figure 18 , it is Figure 17 A schematic cross-sectional view of the first high-refractive-index layer along line AA. The cross-sectional shape of the first microstructure 210A in the first direction D1 is still triangular.

[0135] Furthermore, any two adjacent first boundary lines 210L will have different depths, with the depth d1 of one first boundary line 210L being greater than the depth d2 of the other. It is worth noting that at the deeper locations of the first boundary line 210L, the two adjacent first convex ridge lines 210R will also have a wider spacing R1. Conversely, at the shallower locations of the first boundary line 210L, the two adjacent first convex ridge lines will have a narrower spacing R2.

[0136] Please refer to Figure 19 This image shows a partial bottom view of the first high refractive index layer according to another embodiment of the present invention. The first high refractive index layer 210 in this embodiment is... Figure 16 The illustrated embodiment differs in that the first boundary line 210L and the first ridge line 210R of the first high refractive index layer 210 can also be non-periodic wavy curves. In other words, both the first boundary line 210L and the first ridge line 210R meander irregularly in the horizontal direction, and the relative height between the first ridge line 210R and the first boundary line 210L does not change with their positions in the second direction D2. In other words, the height of the first ridge line 210R relative to the first boundary line 210L remains consistent.

[0137] Please refer to Figure 20 This image shows a partial bottom view of the first high-refractive-index layer according to another embodiment of the present invention. In this embodiment, the first microstructure 210A is a recessed microstructure and has a first concave ridge 210r extending along the second direction D2. The first boundary line 210L and the first concave ridge 210r of the first high-refractive-index layer 210 are both periodic wavy curves and have the same waveform. Furthermore, the relative height of the first boundary line 210L and the first concave ridge 210r does not change with their positions in the second direction D2. In other words, the depth of the first concave ridge 210r relative to the first boundary line 210L remains consistent. Additionally, the first spacing P1 between two adjacent first boundary lines 210L also remains consistent.

[0138] Please refer to Figure 21This diagram shows a partial bottom view of the first high-refractive-index layer according to another embodiment of the present invention. In this embodiment, multiple first boundary lines 210L, 210L' intersect each other to define multiple first regions, each of which has a first microstructure 210A. A portion of the first boundary lines 210L extend along a first direction D1, and another portion of the first boundary lines 210L' extend along a second direction D2. In this embodiment, the first boundary lines 210L extending along the first direction D1 are straight lines, while the first boundary lines 210L' extending along the second direction D2 undulate in the thickness direction of the first high-refractive-index layer 210. Furthermore, the spacing P11 between two adjacent first boundary lines 210L extending along the first direction D1 and the spacing P12 between two adjacent first boundary lines 210L' extending along the second direction D2 can be different.

[0139] In this embodiment, each first microstructure 210A is a convex prism and has a first convex ridge line 210R. For example... Figure 22 As shown, the first convex ridge 210R is an arc-shaped line, and the first convex ridges 210R of two adjacent first microstructures 210A in the first direction D1 bend in different directions. It should be noted that the cross-sectional shape of the first microstructure 210A in the first direction D1 is still triangular.

[0140] In addition, each first microstructure 210A also has multiple first inclined surfaces S1 tilted in different directions, which can effectively disperse multiple light beams with different wavelengths and then remix them within the substrate 20, thereby reducing color shift at wide viewing angles. Furthermore, the arc-shaped first convex ridge 210R can make the refraction and reflection angles of the light beam more varied, avoiding moiré patterns in the displayed image due to interference.

[0141] It should be noted that, in Figure 14 In some embodiments, the first high refractive index layer 210 can be replaced with Figure 16 as well as Figures 19 to 21 The first high refractive index layer 210 shown. Additionally, in Figure 15 In some embodiments, the second low-refractive-index layer 231 can also be replaced, and has the same... Figure 16 as well as Figures 19 to 21 The structure is the same as any of the first high refractive index layers 210 shown.

[0142] Please refer to Figure 22This diagram shows a cross-sectional view of the optical module according to the fifth embodiment of the present invention. Components in the light-emitting module M5 of this embodiment that are identical or similar to those in the light-emitting module M4 of the fourth embodiment have the same reference numerals and will not be described again. In the optical compensation film 2G of this embodiment, a matte structure 23R is also formed on the leveled surface of the second high refractive index layer 230. The haze of the matte structure 23R ranges from 5% to 95%. As mentioned above, the matte structure 23R can reduce surface reflection and increase the luminance of the optical compensation film 2G. It should be noted that the higher the haze of the matte structure 23R, the lower the resolution of the displayed image. Accordingly, when the light-emitting module M4 is used in a display device, the haze range of the matte structure 23R is preferably less than 30% to avoid affecting the resolution of the displayed image. When the light-emitting module M5 is used in a lighting device, the haze of the matte structure 23R can be greater than or equal to 30%, which can improve the luminance of the optical compensation film 2G.

[0143] In addition, the first low-refractive-index layer 211 in this embodiment can be a soft adhesive layer (such as optical adhesive). The optical compensation film 2G can be directly bonded to the light-emitting component 1 using the first low-refractive-index layer 211.

[0144] In summary, one of the beneficial effects of the present invention is that the optical compensation films 2,2A-2G and the display devices and lighting devices using them provided by the present invention can achieve the following: "the first high refractive index layer 210 is located downstream of the first low refractive index layer 211" and "each first microstructure 210A, 210A' includes multiple first inclined surfaces S1, two first inclined surfaces S1 together form a first included angle θ1, and the first included angle θ1 and the refractive index n of the first high refractive index layer 210 are related." H1 and the refractive index n of the first low-refractive-index layer 211 L1 The following relationship is satisfied between them: |θ1-(180-2*(arcsin(n) L1 / n H1 The technical solution of 180 / π|≤10” can reduce the color shift of the displayed image of the display device or lighting device at a large viewing angle (more than 45 degrees), thereby improving the display quality.

[0145] Actual testing showed that when either the first included angle θ1 or the second included angle θ2 satisfies the above-mentioned relationship, when observing the displayed image of an organic light-emitting diode display device or lighting device using the optical compensation films 2,2A to 2G of this invention with the naked eye, even if the viewing angle exceeds 80 degrees, the optical compensation films 2,2A to 2G of this invention can suppress color shift. Furthermore, when observing a flexible organic light-emitting diode display device or lighting device using the optical compensation films 2,2A to 2G of this invention with the naked eye, the area of ​​color shift at the edge of the displayed image is significantly reduced or disappears after the flexible organic light-emitting diode display device or lighting device is bent.

[0146] In addition, in some embodiments, the first boundary line 210L (or the second boundary line 231L) of the first high refractive index layer 210 (or the second low refractive index layer 231) is wavy, the convex ridge line (or concave ridge line) of the first microstructure 210A (or the second microstructure 231A) is wavy, or the first microstructure 210A (and / or the second microstructure 231A) has different shapes, sizes or surface contours, which can further prevent moiré patterns from appearing in the displayed image, thereby improving the quality of the displayed image.

[0147] The above-disclosed content is only a preferred and feasible embodiment of the present invention and is not intended to limit the claims of the present invention. Therefore, all equivalent technical changes and modifications made based on the description and drawings of the present invention are included within the scope 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 having a light-emitting side; and An optical compensation film is disposed on the light-emitting side, wherein the optical compensation film comprises: A substrate having opposing first and second sides; and a first optical structure including a first high-refractive-index layer and a first low-refractive-index layer located together on the first or second side, wherein the first high-refractive-index layer and the first low-refractive-index layer are configured such that a light beam generated by the light-emitting component passes through the first low-refractive-index layer first and then through the first high-refractive-index layer; wherein the first high-refractive-index layer has multiple intersecting first boundary lines on a first textured surface facing the first low-refractive-index layer, defining multiple first regions, each of the multiple first regions forming multiple first microstructures; wherein each first microstructure includes multiple first inclined surfaces, wherein two opposing first inclined surfaces 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 (n L1 / n H1 ) 180 / π))|≤10, θ1 is the first included angle, n H1 Let n be the refractive index of the first high-refractive-index layer, and n be the refractive index of the first high-refractive-index layer. L1 The refractive index of the first low-refractive-index layer; wherein, there is a first spacing between two adjacent first boundary lines, and the line width of each first boundary line is greater than 0.05 times the first spacing but less than 0.2 times the first spacing.

2. The light-emitting module as described in claim 1, characterized in that, The refractive index n of the first low-refractive-index layer L1 The refractive index n of the first high refractive index layer H1 The ratio between (n) L1 / n H1 The range is between 0.8 and 0.95, and the first included angle further 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: (180-2 (arcsin(n L1 / n H1 ) 180 / π)<θ1.

3. The light-emitting module as described in claim 1, characterized in that, Multiple first microstructures define multiple recessed spaces, and the first low-refractive-index layer is a soft adhesive layer, a photocurable layer, or a thermocurable layer. The first low-refractive-index layer forms a cavity or has a porous structure within each first microstructure.

4. The light-emitting module as described in claim 1, characterized in that, The optical compensation film further includes: an adhesive layer attached to the surface of the first low refractive index layer, wherein the refractive index of the first low refractive index layer is greater than or equal to the refractive index of the adhesive layer.

5. The light-emitting module as described in claim 1, characterized in that, A portion of the first microstructure has a different shape, size, or surface profile than another portion of the first microstructure, and at least two adjacent first microstructures have a different shape, size, or surface profile.

6. The light-emitting module as described in claim 1, characterized in that, The optical compensation film further includes: a second optical structure, wherein the first optical structure and the second optical structure are respectively located on opposite sides of the substrate, wherein the second optical structure includes: A second high refractive index layer; and A second low-refractive-index layer is located between the substrate and the second high-refractive-index layer, wherein the second low-refractive-index layer has multiple second boundary lines on the second textured surface facing the second high-refractive-index structure, thereby defining multiple second regions, and multiple second regions respectively form multiple second microstructures; The second microstructure differs from the first microstructure in shape, size, or surface profile.

7. The light-emitting module as described in claim 6, characterized in that, The first spacing between any two adjacent first boundary lines is different from the second spacing between any two adjacent second boundary lines.

8. The light-emitting module as described in claim 6, characterized in that, At least one of the first high refractive index layer or the second high refractive index layer contains nano-zirconia.

9. The light-emitting module as described in claim 1, characterized in that, The substrate has a matte structure on the surface opposite to the first high refractive index layer, and the haze of the matte structure ranges from 5% to 95%.

10. The light-emitting module as described in claim 6, characterized in that, At least one of the first boundary line and the second boundary line is a wavy boundary line, and the wavy boundary line undulates in the thickness direction of the substrate or meanders left and right in the horizontal direction.

11. The light-emitting module as described in claim 6, characterized in that, Each of the first microstructures or each of the second microstructures has a wavy first convex ridge or a first concave ridge.

12. The light-emitting module as described in claim 6, characterized in that, Each of the second microstructures includes at least two second inclined planes, which together form a second included angle. The second included angle satisfies the following relationship with the refractive index of the second high-refractive-index layer and the refractive index of the second low-refractive-index layer: |θ² - (180 - 2π)² / 2π ... arcsin(n L2 / n H2 ) 180 / π)| ≤10, θ2 is the second included angle, n H2 Let n be the refractive index of the second high-refractive-index layer, and n be the refractive index of the second high-refractive-index layer. L2 is the refractive index of the second low-refractive-index layer.

13. The light-emitting module as described in claim 6, characterized in that, Both the first high refractive index layer and the second low refractive index layer are cured layers, and at least one of the first low refractive index layer and the second high refractive index layer is a soft adhesive layer.

14. The light-emitting module as described in claim 6, characterized in that, The difference between the refractive index of the first high refractive index layer and the refractive index of the first low refractive index layer is greater than the difference between the refractive index of the second high refractive index layer and the refractive index of the second low refractive index layer.

15. A light-emitting module, characterized in that, The light-emitting module includes: A light-emitting component having a light-emitting side; and An optical compensation film is disposed on the light-emitting side, wherein the optical compensation film comprises: A substrate having opposing first and second sides; and a first optical structure including a first high-refractive-index layer and a first low-refractive-index layer located together on the first or second side, wherein the first high-refractive-index layer and the first low-refractive-index layer are configured such that a light beam generated by the light-emitting component passes through the first low-refractive-index layer first and then through the first high-refractive-index layer. The first high refractive index layer has a plurality of first microstructures formed on a first textured surface facing the first low refractive index layer. The plurality of first microstructures define a plurality of recessed spaces. The first low refractive index layer fills the plurality of recessed spaces. The first low refractive index layer forms a cavity or has a porous structure within at least one of the first microstructures. Each of the first microstructures includes a plurality of first inclined planes, wherein two opposing first inclined planes together form a first included angle. 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(n L1 / n H1 ) 180 / π))|≤10, θ1 is the first included angle, n H1 Let n be the refractive index of the first high-refractive-index layer, and n be the refractive index of the first high-refractive-index layer. L1 The effective refractive index of the first low refractive index layer is between 1 and the theoretical refractive index of the material of the first low refractive index layer. The first high refractive index layer has multiple intersecting first boundary lines on the first textured surface facing the first low refractive index layer. Each pair of adjacent first microstructures is connected to one of the first boundary lines. There is a first spacing between two adjacent first boundary lines. The line width of each first boundary line is greater than 0.05 times the first spacing but less than 0.2 times the first spacing.

16. A light-emitting module, characterized in that, The light-emitting module includes: A light-emitting component having a light-emitting side; and An optical compensation film is disposed on the light-emitting side, wherein the optical compensation film comprises: A substrate; and a first optical structure located on one side of the substrate, including a first high refractive index layer and a first low refractive index layer, wherein the first high refractive index layer and the first low refractive index layer are configured such that the light beam generated by the light-emitting component passes through the first low refractive index layer first and then through the first high refractive index layer, wherein the first high refractive index layer has a plurality of first microstructures on a first textured surface facing the first low refractive index layer, and each first microstructure includes at least two first bevels; A second optical structure is located on the other side of the substrate and includes a second high refractive index layer and a second low refractive index layer. The second high refractive index layer and the second low refractive index layer are configured such that the light beam generated by the light-emitting component passes through the second low refractive index layer first and then through the second high refractive index layer. The second low refractive index layer has a plurality of second microstructures on a second textured surface facing the second high refractive index layer, and each second microstructure includes at least two second bevels. The inclination direction of each second inclined plane is different from that of any first inclined plane, and the two first inclined planes together form a first included angle. 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(n L1 / n H1 ) 180 / π))|≤10, θ1 is the first included angle, n H1 Let n be the refractive index of the first high-refractive-index layer, and n be the refractive index of the first high-refractive-index layer. L1 The refractive index of the first low-refractive-index layer; The first high refractive index layer has multiple intersecting first boundary lines on the first textured surface facing the first low refractive index layer. Each pair of adjacent first microstructures is connected to one of the first boundary lines. There is a first spacing between two adjacent first boundary lines. The line width of each first boundary line is greater than 0.05 times the first spacing but less than 0.2 times the first spacing.

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