Optical compensation film

Abstract

The invention provides an optical compensation film. The optical compensation film comprises a base material 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 the first side or the second side of the substrate together. The first high refractive index layer is located downstream of an optical path of the first low refractive index layer. The first high refractive index layer is provided with a plurality of first boundary lines which are staggered with one another on a first textured surface facing the first low refractive index layer, so that a plurality of first regions are defined; the plurality of first areas respectively form a plurality of first microstructures. Each first microstructure comprises a plurality of first inclined planes, and two opposite first inclined planes form a first included angle together. The first included angle theta 1, the refractive index nH1 of the first high-refractive-index layer and the refractive index nL1 of the first low-refractive-index layer meet the following relational expression that theta 1-(180-2 * (arcsin (nL1 / nH1) * 180 / pi)) is smaller than or equal to 10, theta 1 is the first included angle, nH1 is the refractive index of the first high-refractive-index layer, and nL1 is the refractive index of the first low-refractive-index layer.

Description

Technical Field

[0001] The present invention relates to an optical film, and more particularly to an optical compensation film capable of improving the color deviation problem of an organic light emitting diode display device or a lighting device. Background Art

[0002] Organic light emitting diodes (OLEDs) can be used in display or lighting devices due to their advantages such as self-luminescence, fast response time, high brightness, high lumen efficiency, low operating voltage, thin thickness and flexibility.

[0003] Existing organic light emitting diode (OLED) display devices or lighting devices usually include multiple sub-pixels, which are used to generate different colors of light (such as red light, blue light, and green light) to mix into white light. Due to the position configuration of the sub-pixels, the light emission angle distribution of different colors of light will not match. As the viewer's viewing angle increases, the display image of the organic light emitting diode display device or lighting device will produce color shift.

[0004] On the other hand, some OLED display devices utilize the microcavity resonance effect to improve luminous efficiency. However, this also makes the intensity and wavelength of light emitted by the OLED highly dependent on the angle of emission. As the viewing angle of the observer increases, the luminous spectrum of individual sub-pixels shifts toward shorter wavelengths, also known as blueshift. Furthermore, because the brightness of red and blue sub-pixels decreases faster than that of green sub-pixels with angular distribution, the white displayed by the OLED display or lighting device will appear greenish when observed at a large angle.

[0005] For flexible organic light emitting diode display devices or lighting devices, there is also a color shift problem for similar reasons. Specifically, when the flexible organic light emitting diode display device or lighting device is bent, a color shift occurs at the edge area of ​​the display image of the flexible organic light emitting diode display device or lighting device.

[0006] Therefore, how to reduce the color deviation of the displayed image of the OLED display device or lighting device at a larger viewing angle, and how to improve the edge color deviation when the flexible OLED display device or lighting device is bent, are still issues that the industry is currently working on solving. Summary of the invention

[0007] The present invention aims at the deficiencies of the prior art and provides an optical compensation film, which can reduce the color deviation of an image when the viewing angle increases, thereby improving the quality of the displayed image.

[0008] One purpose of the present invention is to provide an optical compensation film, which includes 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 together on the first side or the 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 boundary lines that intersect with each other on the first textured surface facing the first low refractive index layer, thereby defining a plurality of first regions. The plurality of first regions respectively form a plurality of first microstructures. Each first microstructure includes a plurality of first inclined planes, and two first inclined planes opposite to each other jointly form a first angle. The first 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: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, θ1 is the first 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.

[0009] One purpose of the present invention is to provide an optical compensation film, which includes 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 the first side or the 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 the 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 recessed spaces, wherein the first low refractive index layer forms a cavity in at least one of the first microstructures, or has a porous structure. Each first microstructure includes at least two first inclined surfaces. The two first inclined surfaces opposite to each other jointly form a first angle, and the first 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 angle, n H1 is the refractive index of the first high refractive index layer, and n L1 is the equivalent refractive index of the first low refractive index layer, and is between 1 and the theoretical refractive index value of the material of the first low refractive index layer.

[0010] One object of the present invention is to provide an optical compensation film, which includes 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, and each first microstructure includes at least two first inclined surfaces. 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, and each second microstructure includes at least two second inclined surfaces. The inclination direction of each second inclined surface is different from the inclination direction of any first inclined surface. The two first inclined surfaces together form a first angle, and the first 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 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.

[0011] One of the beneficial effects of the present invention is that the optical compensation film provided by the present invention can form a first angle θ1 with the refractive index n of the first high refractive index layer by "the first high refractive index layer is located downstream of the optical path of the first low refractive index layer" and "the two first inclined surfaces opposite to each other of each first microstructure jointly form a first angle θ1, and the first angle θ1 and the refractive index n of the first high refractive index layer are H1 and the refractive index n of the first low-refractive-index layer L1 The following relationship is satisfied: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π)|≤10” technical solution can reduce the image color deviation at a large viewing angle, thereby improving the display image quality.

[0012] The advantages of the present invention compared to the prior art have been described in the above purposes. After reading the specification, those familiar with the art can better understand the other benefits and other purposes of the invention defined in the claims. In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not used to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The optical compensation film of the present invention is described in detail below by means of the best embodiment and the accompanying drawings. The drawings are not necessarily drawn in true proportion, and therefore the present invention is not limited to the proportions in the drawings. In the accompanying drawings:

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

[0015] Figure 2 It is a partial three-dimensional exploded schematic diagram of the optical compensation film of the first embodiment of the present invention;

[0016] Figure 3 for Figure 2 A schematic diagram of a partial three-dimensional decomposition of the optical compensation film at another angle;

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

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

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

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

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

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

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

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

[0025] Fig.12 for Fig.11 A partial three-dimensional exploded schematic diagram of an optical compensation film;

[0026] Fig.13 It is a partial three-dimensional exploded schematic diagram of an optical compensation film according to another embodiment of the present invention;

[0027] Fig.14 It is a partial three-dimensional exploded schematic diagram of an optical compensation film according to another embodiment of the present invention;

[0028] Fig.15 It is a partial three-dimensional exploded schematic diagram of an optical compensation film according to another embodiment of the present invention;

[0029] Fig.16 for Fig.15 A three-dimensional schematic diagram of a first high refractive index layer;

[0030] Fig.17 for Fig.16 A schematic top view of a first high refractive index layer;

[0031] Fig.18 for Fig.17 A schematic cross-sectional view of the first high refractive index layer along line AA;

[0032] Fig.19 is a partial top view schematic diagram of a first high refractive index layer according to another embodiment of the present invention;

[0033] Fig. 20 is a partial top view schematic diagram of a first high refractive index layer according to another embodiment of the present invention;

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

[0035] Fig. 22 FIG. 5 is a cross-sectional schematic diagram of a light emitting module according to a fifth embodiment of the present invention.

[0036] Description of Reference Numerals

[0037] M1~M5: Light emitting module

[0038] 1: Light-emitting components

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

[0040] 20: Base material

[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 slope

[0049] θ1: first angle

[0050] 210h: Notch

[0051] 210R: First ridge line

[0052] 210r: first concave ridge line

[0053] 21H: Cavity

[0054] 211: first low refractive index layer

[0055] 211A: Raised microstructure

[0056] 22: Adhesive layer

[0057] W1: Line width

[0058] P1: First spacing

[0059] 20R, 23R: Matte surface

[0060] 23: Second optical structure

[0061] 230: Second high refractive index layer

[0062] 230A: Raised microstructure

[0063] 231: Second low refractive index layer

[0064] 231S: Second textured surface

[0065] 231A: Second microstructure

[0066] 231L: Second Border Line

[0067] P2: Second spacing

[0068] S2: Second slope

[0069] θ2: Second angle

[0070] D1: First direction

[0071] D2: Second direction

[0072] D3: thickness direction

[0073] d1,d2: depth

[0074] P11, P12: Spacing DETAILED DESCRIPTION

[0075] The following is an explanation of the embodiments of the "optical compensation film" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present 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 the present invention. The following embodiments will further explain the relevant technical content of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0076] Please refer to Figure 1 , a cross-sectional schematic diagram of a light-emitting module according to an embodiment of the present invention is shown. 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 a plurality of light-emitting units, and the plurality of 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 arranged on the light-emitting side of the light-emitting component 1, and at least comprises a substrate 20 and a first optical structure 21. The optical compensation film 2 of the embodiment of the present invention can reduce the color deviation of the image displayed by the display device or lighting device at a larger viewing angle, thereby improving the image display quality. Figure 1 In the embodiment of FIG. 1 , 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 according to practical applications.

[0078] The substrate 20 has a first side 20a and a second side 20b opposite to each other. In the present embodiment, the material constituting the substrate 20 may be polyethylene terephthalate (PET), polystyrene (PS), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), PMMA, 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 co-located on the first side 20a or the second side 20b of the substrate 20. In this embodiment, the first side 20a of the substrate 20 faces the light emitting component 1, and 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 co-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. In other words, the light beam generated by the light emitting component 1 will first pass through the first low refractive index layer 211 and then pass through the first high refractive index layer 210, and no total reflection will be generated. The first high refractive index layer 210 can also be made of the same material as the substrate 20.

[0080] Please refer to Figure 1 and Figure 2 , Figure 2 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 numbered) facing the substrate 20. The first textured surface 210S has a plurality of first boundary lines 210L interlaced with each other. Figure 2 As shown, a portion of the first boundary line 210L extends along the first direction D1, and another portion of the first boundary line 210L extends along the second direction D2, and the second direction D2 is not parallel to the first direction D1. A plurality of first boundary lines 210L are interlaced with each other to define a plurality of first regions (not numbered). The outline of each first region is a polygon, and a first microstructure 210A is formed in each first region. In other words, every two adjacent first microstructures 210A are connected to one of the first boundary lines 210L.

[0081] The first microstructure 210A of the present embodiment includes a plurality of first inclined surfaces S1 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. In detail, when the first microstructure 210A is a convex microstructure, the first microstructure 210A is convex relative to the first boundary line 210L connected thereto in a direction away from the substrate 20. When the first microstructure 210A is a concave microstructure, the first microstructure 210A is concave relative to the first boundary line 210L connected thereto in a direction close to the substrate 20. By making each first microstructure 210A have a plurality of first inclined surfaces S1 inclined in different directions, the light beam emitted by the light-emitting unit of the light-emitting component 1 will be first dispersed by the first microstructure 210A when passing through the optical compensation film 2, and then remixed in the substrate 20, which can reduce color deviation at a large viewing angle.

[0082] In addition, 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. Furthermore, the first microstructure 210A is a concave pyramid. Accordingly, the first microstructure 210A includes three or four first inclined surfaces S1 inclined 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 of the embodiment of the present invention is different from the design concept of other optical films used for light expansion. According to actual test results, if the light beam generated by the light-emitting component 1 is totally reflected in the first optical structure 21, a serious color deviation will occur at a relatively small viewing angle (i.e., 0 to 5 degrees), and the displayed image will also produce ghosting, affecting the image quality. The viewing angle referred to in the present invention is defined as the angle between the viewing line of sight and the normal line of 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 passes through the first high refractive index layer 210, which can avoid the light beam of the light emitting component 1 from being totally reflected when passing through the first optical structure 21, thereby avoiding color deviation and ghosting at a small viewing angle. In addition, by making each first microstructure 210A have a plurality of first inclined surfaces S1 extending in different directions, the different colored lights generated by the plurality of light emitting units in the light emitting component 1 can be first dispersed by the plurality of first microstructures 210A, and then remixed in the substrate 20, which can further reduce the color deviation 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 angle θ1 is formed between the two first inclined surfaces S1 opposite to each other, and the first angle θ1 can satisfy the following relationship: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, where θ1 is the first 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 211 .

[0086] It should be noted that, when 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, the ambient light may be totally reflected, thereby reducing the light transmittance of the optical compensation film 2. The critical angle θc of total reflection of light entering 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). Based on this, the above relationship can also be expressed as: |(θ1-(180-2θc)|≤10.

[0087] The optical compensation film 2 is tested with a light emitting component 1 including an organic light emitting diode and observed with the naked eye. According to actual tests, when (θ1-(180-2θc))<(-10), color shift will occur within a viewing angle of 5 degrees. For example, the white color displayed by the displayed image will turn dark green. In addition, when 10<(θ1-(180-2θc)), when the viewing angle is less than or equal to 45 degrees, almost no color shift will occur. When the viewing angle exceeds 45 degrees, although the color shift phenomenon can still be observed, the degree of color shift has been reduced. For example, when the viewing angle exceeds 45 degrees, the naked eye can observe that the white color of the displayed image turns light green.

[0088] However, when -10≤(θ1-(180-2θc))≤10, there is a more prominent effect on improving the color shift phenomenon of the displayed image at a larger viewing angle (more than 45 degrees). Even when the viewing angle exceeds 80 degrees, there is almost no color shift. Therefore, by making the first angle θ1 satisfy the following relationship, that is, |θ1-(180-2θc)|≤10, a prominent and substantial effect can be produced. More preferably, when |θ1-(180-2θc)|≤5, there is a better effect on improving the color shift.

[0089] In addition, in this embodiment, the first angle θ1 is further made to conform to the following relationship: (180-2*(arcsin(n L1 / n H1 )*180 / π)<θ1 (that is, (180-2θc)<θ1), the optical compensation film 2 can also have a relatively good transmittance as much as possible. That is to say, 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 transmittance of the optical compensation film 2.

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

[0091] In a preferred embodiment, the first high refractive index layer 210 may have a refractive index n H1 The first high refractive index layer 210 is a photocurable layer, which is, for example, polymethyl methacrylate (PMMA). In addition, the first low refractive index layer 211 can be selected to have a refractive index n L1 The first low refractive index layer 211 can be a soft adhesive layer or a cured layer that can be cured by ultraviolet light or heat.

[0092] Please refer to 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 concave space defined by the plurality of first microstructures 210A. Figure 3 As shown, the first low refractive index layer 211 has a plurality of protruding microstructures 211A on the surface facing the first high refractive index layer 210, and the shapes thereof can respectively cooperate with the plurality of 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 combined with 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 of this embodiment is a solidified layer, and the first low refractive index layer 211 is a soft adhesive layer. The soft adhesive layer can be made of an optical clear adhesive (OCA) with a lower refractive index, such as silicone. For example, the refractive index of the soft adhesive layer can be less than or equal to 1.41. In addition, the peel strength of the soft adhesive layer is at least 10N / 25mm. Accordingly, the optical compensation film 2 of this embodiment can omit the adhesive layer 22, and can be directly combined with 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, an ultraviolet light curing layer or a heat curing layer, after forming the first low refractive index layer 211, a plurality of bubbles may be generated inside the first low refractive index layer 211, so that the first low refractive index layer 211 has a porous structure. Although the plurality of bubbles inside the first refractive index layer 211 slightly reduce the transparency of the optical compensation film 2, it does not affect the effect of the optical compensation film 2 in improving the color deviation.

[0096] It should be noted that in the above relationship |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10, n L1 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 fact, it is greater than 1 and less than the theoretical refractive index value 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, an ultraviolet curing layer, or a heat curing layer. For example, assuming that the theoretical refractive index value 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 is L1 will be between 1 and 1.41, i.e. 1 <n L1 <1.41, and varies according to the volume percentage of the bubbles. In addition, assuming that the refractive index of the first high refractive index layer 210 is 1.68, according to the above relationship, the first angle θ1 is between 80 degrees and 120 degrees, preferably between 85 degrees and 100 degrees.

[0097] Please refer to Figure 4 , shows a partial three-dimensional exploded schematic diagram 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 in the shape of a convex pyramid, that is, it convexes in a direction 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 concave microstructure, and the concave microstructure is in the shape of a concave pyramid.

[0098] Please refer to Figure 1 and Figure 5 ,in, Figure 5 A partial three-dimensional schematic diagram 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 shown 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 the present embodiment, the first microstructure 210A is a recessed microstructure. Each first boundary line 210L is a wavy boundary line, and the wavy boundary line fluctuates up and down in the thickness direction D3 of the first high refractive index layer 210. Further, in the present embodiment, the first boundary line 210L fluctuates periodically. In addition, the wavelength of the first boundary line 210L extending in the first direction D1 will correspond to a first microstructure 210A. Similarly, the wavelength of the first boundary line 210L extending in the second direction D2 also corresponds to a first microstructure 210A. However, the present invention does not limit the size relationship between the wavelength of the first boundary line 210L and the first microstructure 210A.

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

[0100] Please refer to Figure 6 and Figure 7 , depicts a partial three-dimensional schematic diagram and a bottom schematic diagram of the first high refractive index layer of another embodiment of the present invention. In the first high refractive index layer 210 of this embodiment, the first boundary line 210L is also a wavy boundary line. Figure 5 In the first high refractive index layer 210 of the embodiment, the waveform of the first boundary line 210L of the embodiment has a longer wavelength. In other words, in the embodiment, the wavelength of the first boundary line 210L extending in the first direction D1 (or the second direction D2) may correspond to the plurality of first microstructures 210A arranged in the first direction D1 (or the second direction D2). In addition, in the embodiment, a plurality of gaps 210h are formed at the intersection of one of the first boundary lines 210L extending along the first direction D1 and one 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. Figure 7, multiple first microstructures 210A do not necessarily have to have the same shape. That is to say, a portion of the first microstructure 210A and another portion of the first microstructure 210A' may have different shapes, sizes or surface profiles. In the present embodiment, a portion of the first microstructure 210A has a convex pyramid shape, while another portion of the first microstructure 210A' has a convex prism shape. The aforementioned convex prism may be a triangular prism or a quadrangular 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 further has a plurality of notches 210h located at the intersections of the plurality of first boundary lines 210L, and a plurality of first microstructures 210A, 210A' having different shapes are randomly distributed above the light-emitting component 1, which has a better effect on suppressing the generation of moiré patterns in the displayed image, thereby further improving the image quality.

[0103] It should be noted that the wavy first boundary line 210L may also meander left and right in the horizontal direction, which may also achieve the effect of suppressing the generation of moiré patterns in the displayed image.

[0104] Please refer to Figure 8 as well as Fig. 9 , Figure 8 is a partial cross-sectional schematic diagram of a light emitting module according to another embodiment of the present invention, and Fig. 9 for Figure 8 The components of the light emitting module M2 of this embodiment that are the same or similar to those of the light emitting module M1 of the previous embodiment have the same or similar reference numerals and will not be described in detail.

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

[0106] It should be noted that, compared with using a photocurable layer or a thermal curable layer as the first low refractive index layer 211, using a soft adhesive layer as the first low refractive index layer 211 makes the optical compensation film 2A have better reliability. In detail, since the soft adhesive layer is soft and deformable, when the ambient temperature changes greatly, the first high refractive index layer 210 and the soft adhesive layer can be prevented from separating from each other due to the internal stress generated by the difference in thermal expansion coefficient. Accordingly, the optical compensation film 2A of this embodiment can be used in a more severe working environment.

[0107] like Figure 8 As shown, the plurality of first microstructures 210A are recessed microstructures and define a plurality of 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 and forms a cavity 21H at the bottom of the first microstructure 210A. Accordingly, a plurality of 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] The first optical structure 21 of the optical compensation film 2A of the present embodiment has a plurality of cavities 21H inside. Therefore, compared with 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, so that the optical compensation film 2A has better light diffusion performance, but has relatively low transparency. However, in the first microstructure 210A of the present embodiment, the first angle θ1 of the two first inclined surfaces S1 and the critical angle θc of total reflection satisfy the relationship: |θ1-(180-2θc)|≤10, so that the optical compensation film 2A can be used to improve color deviation. Accordingly, the optical compensation film 2A of the present embodiment can be applied to an organic light emitting diode lighting device. After actual testing, after the optical compensation film 2A of the present embodiment is applied to an organic light emitting diode display device or lighting device, when observed with the naked eye, when the viewing angle exceeds 80 degrees, the displayed image does not produce color deviation.

[0109] As mentioned above, due to the existence of the cavity 21H, the equivalent refractive index n of the first low-refractive-index layer 211 is L1 In fact, it is smaller than the theoretical value of its material. For example, assuming that the first low-refractive index layer 211 is a soft adhesive layer, and the theoretical refractive index of its material is 1.41, then the equivalent refractive index n of the first low-refractive index layer 211 containing bubbles is L1 will be between 1 and 1.41, i.e. 1 <n L1<1.41, which varies according to the volume proportion of the cavity 21H. In addition, assuming that the refractive index of the first high refractive index layer 210 is 1.68, according to the above relationship, the first angle θ1 is between 80 degrees and 120 degrees, preferably between 85 degrees and 100 degrees.

[0110] Please refer to Figure 8 and Fig. 9 In this embodiment, each first boundary line 210L of the first high refractive index layer 210 has a line width W1, and a first pitch P1 is provided between two adjacent first boundary lines 210L. Different from the previous embodiment, the line width W1 of the first boundary line 210L of this embodiment may be greater than or equal to 0.05 times the first pitch P1, but less than or equal to 0.2 times the first pitch P1, that is, the following relationship is satisfied: 0.05P1≤W1≤0.2P1. In one embodiment, the first pitch P1 ranges from 20μm to 30μm. When the first pitch P1 is 20μm, the line width W1 ranges from 1μm to 4μm.

[0111] It should be noted that in Figure 1 In the embodiment of FIG. 1 , the line width W1 of the first boundary line 210L is approximately 0.02 times of the first pitch P1. Figure 1 In the embodiment of the present invention, the first high refractive index layer 210 of the present embodiment is in contact with the air and the first low refractive index layer 211 at the same time. When the optical compensation film 2A is applied in an environment with large temperature changes, the internal stress generated 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 line width W1 of the first boundary line 210L greater than or equal to 0.05 times of the first pitch P1, the bonding area between the first low refractive index layer 211 and the first high refractive index layer 210 can be increased, and the bonding strength between the two can be enhanced, thereby improving the reliability of the first optical structure 21.

[0112] In addition, by making the line width W1 of the first boundary line 210L less than or equal to 0.2 times of the first pitch P1, it is possible to avoid excessively sacrificing the effect of the optical compensation film 2A on improving color deviation. The first boundary line 210L may have a flat surface or an arc surface. In addition, as described in the previous embodiment, the first boundary line 210L of this embodiment may also be a wavy boundary line.

[0113] Please refer to Fig.10In the light-emitting module M3 of the embodiment of the present invention, 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 range of the matte structure 20R is from 5% to 95%. The matte structure 20R can reduce surface reflection and increase the brightness 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 to 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 to a lighting device, the haze of the matte structure 20R can be greater than or equal to 30%, which can improve the brightness 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 surface of the substrate 20 and / or the first low refractive index layer 211 may be directly made to have a high roughness during the process of manufacturing the substrate 20 or the first low refractive index layer 211. In another embodiment, a diffusion particle layer may 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 method of forming the matte structure 20R.

[0115] Please refer to Fig.11 and Fig.12 , the components of the light emitting module M4 of this embodiment that are the same as those of the light emitting module M1 of the first embodiment have the same or similar reference numerals and are not described in detail. 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 the present embodiment is located at 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 passes through the second high refractive index layer 230, and no total reflection occurs in the second optical structure 23.

[0117] In this embodiment, the second low refractive index layer 231 may have a refractive index n L2 The second high refractive index layer 230 may be a material with a refractive index n between 1.4 and 1.5, and the second low refractive index layer 231 may be a cured layer formed by curing by ultraviolet light or heating.H2 The second high refractive index layer 230 may be a soft adhesive layer, or a cured layer that can be cured by ultraviolet light or heat. When the second high refractive index layer 230 is a soft adhesive layer (such as optical glue), the soft adhesive layer may contain nano zirconium oxide, so that the refractive index of the soft adhesive layer is greater than or equal to 1.60.

[0118] Please refer to Fig.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. In detail, the second textured surface 231S has a plurality of second boundary lines 231L to define a plurality of second regions, and a plurality of second microstructures 231A are respectively formed in the plurality of second regions. It is worth noting that in the present 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 will be different from the size of the second microstructure 231A. In this way, the generation of moiré pattern in the displayed image can be avoided, thereby improving the image quality.

[0119] Please refer to Fig.12 In this embodiment, a plurality of second boundary lines 231L are interlaced with each other to define a plurality of second regions. The extension direction (first direction D1) of a portion of the second boundary lines 231L is not parallel to the extension direction (second direction D2) of another portion of the second boundary lines 231L. It is worth mentioning that the extension direction of the second boundary lines 231L may also be different from the extension direction of the first boundary lines 210L to avoid the generation of moiré patterns.

[0120] The second microstructure 231A is a concave microstructure, that is, it is concave relative to the second boundary line 231L toward the substrate 20. Each second microstructure 231A may include a plurality of second inclined surfaces S2, each of which is inclined relative to the thickness direction D3 of the second low refractive index layer 231. Fig.11 The second angle θ2 formed between the two opposite second inclined surfaces S2 can satisfy the following relationship: |θ2-(180-2*arcsin(n L2 / n H2 )*180 / π)|≤10, where θ2 is the second angle, n H2 is the refractive index of the second highest refractive index layer, and n L2 is the refractive index of the second low refractive index layer 231 .

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

[0122] In this way, it is possible to avoid the ambient light entering from the surface of the second high refractive index layer 230 from being totally reflected, thereby reducing the transmittance of the optical compensation film 2C. In other words, the optical compensation film 2C provided by the embodiment of the present invention can not only improve the color shift phenomenon of the displayed image at a large viewing angle, but also enable the optical compensation film 2 to maintain the required transmittance. In addition, the refractive index n of the second low refractive index layer 231 is L2 The refractive index n of the second high refractive index layer 230 is H2 The ratio between L2 / n H2 ) ranges from 0.8 to 0.95.

[0123] In addition, 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 is L1 The difference ΔN1 between them is 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 is L2 The difference ΔN2 between them is 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 a plurality of second inclined surfaces S2 inclined in different directions, but the present invention is not limited thereto. The second high refractive index layer 230 is a photocured layer, and a portion of the second high refractive index layer 230 fills the concave space defined by the plurality of second microstructures 231A. Fig.12 As shown, the second high refractive index layer 230 has a plurality of protruding microstructures 230A on the surface facing the second low refractive index layer 231, and the shapes thereof can respectively cooperate with the plurality of second microstructures 231A. Since the second microstructures 231A of this embodiment are in the shape of a concave pyramid, and the protruding microstructures 230A are in the shape of a convex pyramid, the present invention is not limited thereto.

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

[0126] Please refer to Fig.13 , showing a partial three-dimensional exploded schematic diagram of an optical compensation film of another embodiment of the present invention. The optical compensation film 2D of this embodiment and Fig.12 The difference of the optical compensation film 2C shown is that in the second optical structure 23 of this embodiment, the plurality of 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 in the shape of an elongated strip 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. In addition, Fig.13 The first optical structure 21 and the second optical structure 23 shown may also be interchanged.

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

[0128] Please refer to Fig.15 In the optical compensation film 2F of the present embodiment, the plurality of second boundary lines 231L of the second low refractive index layer 231 all extend along the first direction D1, and the second microstructure 231A is also a convex column extending along the first direction D1. In addition, the plurality of first boundary lines 210L of the first high refractive index layer 210 all extend along the second direction D2, and the first microstructure 210A is a convex column extending along the second direction D2. In other words, the extension direction of the first boundary line 210L is different from the extension direction of the second boundary line 231L. Accordingly, the vertical projection of the second microstructure 231A will intersect with the first microstructure 210A. The inclination direction of the second inclined surface S2 of each second microstructure 231A is different from the inclination direction of any first inclined surface S1.

[0129] Thus, when the optical compensation film 2F of the present embodiment is applied to a display device or a lighting device, it has the effect of improving color deviation. In addition, at least one of the first boundary line 210L and the second boundary line 231L is wavy. In the present embodiment, the first boundary lines 210L of the first high refractive index layer 210 are wavy, and the second boundary lines 231L are straight lines. In other embodiments, the first boundary line 210L and the second boundary line 231L are both wavy. The first boundary line 210L and / or the second boundary line 231L are wavy, which can avoid the generation of moiré in the displayed image.

[0130] Further, in the first microstructure 210A, the first angle θ1 between the two first inclined surfaces S1 and the total reflection critical angle θc satisfy the relationship |θ1-(180-2θc)|≤10; or, in the second microstructure 231A, the second angle θ2 between the two second inclined surfaces S2 and the total reflection critical angle θc' satisfy the relationship |θ2-(180-2θc')|≤10. Thus, the effect of the optical compensation film 2F in improving color deviation can be greatly improved.

[0131] The following takes the first high refractive index layer 210 as an example to explain different implementations in detail. Fig.16 , picture Fig.15 Schematic diagram of the first high refractive index layer. In this embodiment, each first microstructure 210A is in the shape of an elongated strip and convex relative to the first boundary line 210L. Each first microstructure 210A has a first convex ridge line 210R extending along the first boundary line 210L.

[0132] Please refer to Fig.17 ,for Fig.16 FIG. 2 is a top view schematic diagram of the first high refractive index layer. In the present embodiment, the first ridge line 210R is a wavy ridge line, and the first ridge line 210R meanders left and right in a direction parallel to the surface relative to the first boundary line 210L. In other words, the spacing between adjacent first ridge lines 210R and first boundary lines 210L in the first direction D1 will change as the position of the first ridge line 210R changes. In addition, the ridge line spacing between two adjacent first ridge lines 210R will also change as the position of the first ridge line 210R changes. Further, the ridge line spacing is a function of the position of the first ridge line 210R in the second direction D2.

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

[0134] Please refer to Fig.18 , which is Fig.17 The cross-sectional shape of the first microstructure 210A in the first direction D1 is still a triangle.

[0135] In addition, any two adjacent first boundary lines 210L have different depths, wherein the depth d1 of one first boundary line 210L is greater than the depth d2 of the other first boundary line 210L. It is worth noting that at a position where the depth of the first boundary line 210L is deeper, the two adjacent first ridge lines 210R will also have a wider spacing R1. At a position where the depth of the first boundary line 210L is smaller, the two adjacent first ridge lines will also have a narrower spacing R2.

[0136] Please refer to Fig.19 , showing a partial bottom view of a first high refractive index layer according to another embodiment of the present invention. Fig.16 The embodiment shown is different 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, the first boundary line 210L and the first ridge line 210R will irregularly meander in the horizontal direction, and the relative height between the first ridge line 210R and the first boundary line 210L will not change with the different 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 Fig. 20 , showing a partial bottom view schematic diagram of the first high refractive index layer of another embodiment of the present invention. In this embodiment, the first microstructure 210A is a recessed microstructure and has a first concave ridgeline 210r extending along the second direction D2. The first boundary line 210L of the first high refractive index layer 210 and the first concave ridgeline 210r are both periodic wavy curves and have the same waveform. In addition, the relative height of the first boundary line 210L and the first concave ridgeline 210r will not change with the different positions in the second direction D2. In other words, the depth of the first concave ridgeline 210r relative to the first boundary line 210L is consistent. In addition, the first spacing P1 between two adjacent first boundary lines 210L will also remain consistent.

[0138] Please refer to Fig.21, showing a partial bottom view schematic diagram of the first high refractive index layer of another embodiment of the present invention. In this embodiment, a plurality of first boundary lines 210L, 210L' are staggered with each other to define a plurality of first regions, each of which is provided with a first microstructure 210A. A portion of the first boundary lines 210L extends along the first direction D1, and another portion of the first boundary lines 210L' extends along the 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 are undulating in the thickness direction of the first high refractive index layer 210. In addition, the spacing P11 between two adjacent first boundary lines 210L extending along the first direction D1 may be different from the spacing P12 between two adjacent first boundary lines 210L' extending along the second direction D2.

[0139] In this embodiment, each first microstructure 210A is a convex prism and has a first convex ridge line 210R. Fig. 22 As shown, the first ridge line 210R is an arc line, and the first ridge lines 210R of two adjacent first microstructures 210A in the first direction D1 are bent in different directions. It should be noted that the cross-sectional shape of the first microstructure 210A in the first direction D1 is still a triangle.

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

[0141] It should be noted that in Fig.14 In the embodiment of the present invention, the first high refractive index layer 210 may be replaced by Fig.16 as well as Figures 19 to 21 Any of the first high refractive index layers 210 shown. Fig.15 In the embodiment of the present invention, the second low refractive index layer 231 may also be replaced by Fig.16 as well as Figures 19 to 21 Any of the first high refractive index layers 210 shown has the same structure.

[0142] Please refer to Fig. 22, which is a cross-sectional schematic diagram of an optical module according to the fifth embodiment of the present invention. The components of the light-emitting module M5 of this embodiment that are the same as or similar to the light-emitting module M4 of the fourth embodiment have the same reference numerals and will not be described in detail. In the optical compensation film 2G of this embodiment, a matte structure 23R is also formed on the flattened 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 brightness 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 applied to 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 applied to a lighting device, the haze of the matte structure 23R can be greater than or equal to 30%, which can improve the brightness of the optical compensation film 2G.

[0143] In addition, the first low refractive index layer 211 of the present embodiment may be a soft adhesive layer (eg, optical glue). The optical compensation film 2G may 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 provided by the present invention and the display device and lighting device using the same can be realized by "the first high refractive index layer 210 is located downstream of the light path of the first low refractive index layer 211" and "each of the first microstructures 210A, 210A' includes a plurality of first inclined surfaces S1, two first inclined surfaces S1 together form a first angle θ1, and the first angle θ1 and the refractive index n of the first high refractive index layer 210 are equal to each other. H1 and the refractive index n of the first low-refractive-index layer 211 L1 The following relationship is satisfied: |θ1-(180-2*(arcsin(n L1 / n H1 )*180 / π))|≤10” can reduce the color deviation 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] After actual testing, when the first angle θ1 or the second angle θ2 satisfies the above relationship, the optical compensation films 2, 2A to 2G of the embodiments of the present invention are observed with the naked eye to suppress color deviation even when the viewing angle exceeds 80 degrees. In addition, when the flexible organic light-emitting diode display device or lighting device using the optical compensation films 2, 2A to 2G of the embodiments of the present invention is observed with the naked eye, the area of ​​the color deviation at the edge of the displayed image of the bent flexible organic light-emitting diode display device or lighting device will be significantly reduced or there will be no color deviation.

[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 profiles, which can further avoid the generation of moiré patterns in the displayed image, thereby improving the displayed image quality.

[0147] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the claims of the present invention. Therefore, all equivalent technical changes and modifications made using the description and drawings of the present invention are included in the claims of the present invention.

Claims

1. An optical compensation film, characterized in that: The optical compensation film comprises: a substrate having a first side and a second side opposite to each other; and A first optical structure, comprising a first high refractive index layer and a first low refractive index layer located together on the first side or the second side, wherein 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 boundary lines interlaced with each other on a first textured surface facing the first low refractive index layer, thereby defining a plurality of first regions, and a plurality of first microstructures are formed in each of the plurality of first regions; Each of the first microstructures includes a plurality of first inclined surfaces, wherein two of the first inclined surfaces opposite to each other jointly form a first angle, and the first 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 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.

2. The optical compensation film according to 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 is H1 The ratio between L1 / n H1 ) is in the range of 0.8 to 0.95, and the first angle and the refractive index of the first high refractive index layer and the refractive index of the first low refractive index layer further satisfy the following relationship: (180-2*(arcsin(n L1 / n H1 )*180 / π)<θ1.

3. The optical compensation film according to claim 1, characterized in that There is a first interval between two adjacent first boundary lines, and the line width of each of the first boundary lines is greater than 0.05 times the first interval but less than 0.2 times the first interval.

4. The optical compensation film according to claim 3, characterized in that: The first microstructures define a plurality of recessed spaces. The first low refractive index layer is a soft adhesive layer, a photocurable layer or a thermal curable layer. The first low refractive index layer forms a cavity in each of the first microstructures or has a porous structure.

5. The optical compensation film according to 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.

6. The optical compensation film according to claim 1, characterized in that: A portion of the first microstructures has a different shape, size or surface profile from another portion of the first microstructures, and at least two adjacent first microstructures have a different shape, size or surface profile.

7. The optical compensation film according to claim 1, characterized in that: The optical compensation film further comprises: a second optical structure, wherein the first optical structure and the second optical structure are respectively located on two opposite sides of the substrate, wherein the second optical structure comprises: a second high refractive index layer; and a second low refractive index layer, located between the substrate and the second high refractive index layer, wherein the second low refractive index layer has a plurality of second boundary lines on a second textured surface facing the second high refractive index structure, thereby defining a plurality of second regions, and a plurality of second regions are respectively formed with a plurality of second microstructures; The second microstructure is different from the first microstructure in shape, size or surface profile.

8. The optical compensation film according to claim 7, characterized in that: A first distance between any two adjacent first boundary lines is different from a second distance between any two adjacent second boundary lines.

9. The optical compensation film according to claim 7, characterized in that: At least one of the first high refractive index layer or the second high refractive index layer contains nano zirconium oxide.

10. The optical compensation film according to claim 1 or 7, characterized in that: The substrate has a matte structure on a surface facing away from the first high refractive index layer, or the second high refractive index layer has a surface facing away from the second low refractive index layer, and the haze of the matte structure ranges from 5% to 95%.

11. The optical compensation film according to claim 7, 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 is undulating in the thickness direction of the substrate, or meanders left and right in the horizontal direction.

12. The optical compensation film according to claim 7, characterized in that: Each of the first microstructures or each of the second microstructures has a wavy first convex ridge line or a first concave ridge line.

13. The optical compensation film according to claim 7, characterized in that: Each of the second microstructures includes at least two second inclined surfaces, the two second inclined surfaces together form a second angle, and the second 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-(180-2*arcsin(n L2 / n H2 )*180 / π)|≤10, θ2 is the second angle, n H2 is the refractive index of the second high refractive index layer, and n L2 is the refractive index of the second low refractive index layer.

14. The optical compensation film according to claim 7, characterized in that: The first high refractive index layer and the second low refractive index layer are both solidified layers, and at least one of the first low refractive index layer and the second high refractive index layer is a soft adhesive layer.

15. The optical compensation film according to claim 7, characterized in that: A difference between a refractive index of the first high refractive index layer and a refractive index of the first low refractive index layer is greater than a difference between a refractive index of the second high refractive index layer and a refractive index of the second low refractive index layer.

16. An optical compensation film, characterized in that: The optical compensation film comprises: a substrate having a first side and a second side opposite to each other; and A first optical structure, comprising a first high refractive index layer and a first low refractive index layer located together on the first side or the second side, wherein 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 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, and the first low refractive index layer forms a cavity in at least one of the first microstructures, or has a porous structure; Each of the first microstructures includes a plurality of first inclined surfaces, wherein two of the first inclined surfaces opposite to each other jointly form a first angle, and the first 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 angle, n H1 is the refractive index of the first high refractive index layer, and n L1 is the equivalent refractive index of the first low refractive index layer, and is between 1 and the theoretical refractive index value of the material of the first low refractive index layer.

17. An optical compensation film, characterized in that: The optical compensation film comprises: a substrate; and a first optical structure, located on one side of the substrate, and comprising a first high refractive index layer and a first low refractive index layer, wherein the first high refractive index layer is located downstream of the optical path of the first low refractive index layer, and 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 of the first microstructures comprises at least two first inclined surfaces; a second optical structure, located on the other side of the substrate, and comprising a second high refractive index layer and a second low refractive index layer, wherein the second high refractive index layer is located downstream of the optical path of the second low refractive index layer, and 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 of the second microstructures comprises at least two second inclined surfaces; The inclination direction of each of the second inclined surfaces is different from the inclination direction of any of the first inclined surfaces, and the two first inclined surfaces together form a first angle, and the first 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 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.

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