Microlens optical structure and optical film

Abstract

The invention discloses a micro-lens optical structure and an optical film, and relates to the technical field of display. The micro-lens optical structure comprises a semi-circular convex hull, a first lens, a second lens and a third lens, the wrinkle structures are arranged on the spherical surface of the semicircular convex hull and are uniformly distributed in the circumferential direction of the bottom of the semicircular convex hull; wherein the plurality of wrinkle structures are arranged by deviating from the symmetry axis of the semicircular convex hull, and are arranged by slotting from the upper surface of the semicircular convex hull to the bottom of the outer edge of the semicircular convex hull according to a preset angle, so that a composite microstructure in which a plurality of arc-shaped grooves are uniformly distributed is formed. According to the invention, the problems of high cost, complex processing technology and light interference defect of the existing diffusion film in the aspect of improving the uniformity of the LED light source and the problem of limited improvement of the picture uniformity and shielding effect of the traditional structure are solved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a microlens optical structure and an optical film. Background Art

[0002] With the iterative development of liquid crystal displays, the current traditional direct-down structure generally arranges two layers of diffusion films above the LED light source to mix light. The main function of the light diffusion film is to convert point light sources and line light sources into surface light sources, and it has the characteristics of high transmittance and high haze.

[0003] However, existing diffuser films, when it comes to improving LED light uniformity, face challenges such as high cost, complex manufacturing processes, and light interference defects. Furthermore, traditional structures offer limited improvements in image uniformity and shielding. Currently, no effective solutions have been proposed to address these issues. Summary of the Invention

[0004] Purpose of the invention: To provide a microlens optical structure and an optical film to solve at least one of the problems existing in the above-mentioned prior art.

[0005] Technical solution: A microlens optical structure, comprising:

[0006] a semicircular convex hull; and

[0007] A plurality of pleated structures are provided on the spherical surface of the semicircular convex hull and are evenly distributed along the circumference of the bottom of the semicircular convex hull;

[0008] Among them, several of the pleated structures are set away from the symmetry axis of the semicircular bulge, and are grooved from the upper surface of the semicircular bulge to the bottom of the outer edge of the semicircular bulge at a preset angle to form a composite microstructure with several evenly distributed arc-shaped grooves.

[0009] Preferably, the semicircular convex hull is a hemispherical structure, the radius R1 of the hemispherical structure is 5-30 μm, and the height H thereof is (R1) / 2≤H≤R1.

[0010] Preferably, the pleated structure is a cylindrical hole-digging structure.

[0011] Preferably, the radius R2 of the cylindrical bottom surface of the corrugated structure is 1-5 μm;

[0012] The radius R1 of the hemispherical structure is not equal to the radius R2 of the cylindrical bottom surface.

[0013] Preferably, the distance A1 between the center O of the cylindrical bottom surface of the pleated structure and the edge of the hemisphere is 0-5 μm.

[0014] Preferably, the inclination angle α1 of the cylinder of the pleated structure is 0°<α1≤90°, and the cylinder and its extended state do not exceed the dome center point of the hemisphere.

[0015] Preferably, the inclination angle α1 is a specified angle or a gradual angle.

[0016] Preferably, the number of the plurality of pleated structures is 3-10.

[0017] In order to achieve the above-mentioned purpose, according to another aspect of the present application, an optical film is also provided.

[0018] The optical film according to the present application comprises the microlens optical structure;

[0019] It also includes: a substrate layer, which is arranged on the light incident side of the microlens optical structure.

[0020] Preferably, there are multiple microlens optical structures, and the multiple microlens optical structures are distributed on the substrate layer in a matrix, densely distributed or randomly distributed manner.

[0021] Beneficial effect: In the embodiment of the present application, a pleated structure is added, and several of the pleated structures are set to deviate from the symmetry axis of the semicircular convex hull, and grooves are set from the upper surface of the semicircular convex hull to the bottom of the outer edge of the semicircular convex hull at a preset angle to form a composite microstructure with several evenly distributed arc grooves. The purpose of further disrupting the light distribution by using the pleated structure while having the function of focusing light to the focus of the microlens is achieved, thereby achieving the technical effect of improving the uniformity and shielding of the picture while maintaining high brightness, thereby solving the problems of high cost, complex processing technology and light interference defects of the existing diffusion film in improving the uniformity of LED light sources, and the technical problem that the traditional structure has limited effect on improving the uniformity and shielding of the picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of the microlens optical structure of the present invention;

[0023] Figure 2 is a top view of the microlens optical structure of the present invention;

[0024] Figure 3 is a comparative diagram of a traditional light distribution diagram and the light distribution diagram of the present application;

[0025] Figure 4 is a schematic diagram of the microlens optical structure of the present invention; and

[0026] Figure 5It is a schematic diagram of the cylindrical hole structure of the microlens optical structure of the present invention.

[0027] The accompanying drawings are:

[0028] 10. Semicircular convex hull;

[0029] 20. Pleated structure. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] like Figure 1-5 As shown, the present application relates to a micro lens optical structure and an optical film. Figure 1-2As shown, the microlens optical structure includes a semicircular convex hull 10. This semicircular convex hull 10 is a hemispherical protrusion constructed with the base plane as the reference, and is the basic optical element of the entire microlens. The hemispherical structure simulates the surface of an ideal Lambertian body, controlling the diffusion angle of incident light through curvature. When light is incident vertically, the hemispherical surface can achieve uniform distribution correction of the incident angle.

[0035] Preferably, the material of the semicircular convex hull 10 includes but is not limited to: a high refractive index polymer (such as PMMA, n=1.49 or polycarbonate, n=1.58) to enhance the refractive effect.

[0036] A plurality of pleated structures 20 are arranged on the spherical surface of the semicircular convex hull 10 and are evenly distributed along the circumferential direction of the bottom of the semicircular convex hull 10; the pleated structure 20 is a small-scale surface texture distributed along the spherical surface of the semicircular convex hull 10, and is evenly distributed along the circumferential direction of the bottom of the semicircular convex hull 10, ensuring the symmetry and stability of the optical performance and avoiding the occurrence of spot shape deviation.

[0037] Several of the pleated structures 20 are offset from the axis of symmetry of the semicircular convex hull 10 and slotted at predetermined angles from the upper surface of the semicircular convex hull 10 toward the outer edge of the hull, forming a composite microstructure with a uniform distribution of arcuate grooves. By offsetting the pleated structure 20 from the axis of symmetry, light passing through it is more evenly refracted and scattered. Furthermore, the pleats extend at predetermined angles from the upper surface toward the outer edge, forming a series of arcuate grooves. Through multiple refraction, reflection, and diffraction of light, a complex beam shaping effect is achieved, optimizing spot uniformity and brightness distribution.

[0038] The purpose of this application is to distinguish from traditional micro lenses and improve the shielding property of the film and the uniformity of the image while maintaining the brightness.

[0039] This application forms a new microlens structure by adding several wrinkled areas on the surface of the microlens, which scatters the light below, thereby improving the shielding property and picture uniformity of the diaphragm while maintaining a high brightness at the central viewing angle.

[0040] Specifically, the present application adopts the method of adding a pleated structure 20 of different widths and slopes to the traditional microlens structure, so that while having the function of focusing light to the focal point of the microlens, the pleated structure 20 is used to further disrupt the distribution of light, thereby improving the uniformity and shielding of the picture while maintaining high brightness.

[0041] like Figure 1-2As shown, depressions are uniformly distributed on the microlens structure to form a microlens structure array with wrinkles. This setting can further disrupt the light distribution by utilizing the wrinkled structure 20, thereby enhancing the uniformity and shielding effect of the image while maintaining high brightness.

[0042] As Figure 3 shown, Figure 3 (Left) is the light distribution diagram of a traditional microlens. Figure 3 (Right) is the light distribution diagram of the wrinkled microlens in this solution. It can be seen that compared with the traditional microlens, the viewing angle of this application is larger and the brightness distribution is more uniform.

[0043] From the above description, it can be seen that this application achieves the following technical effects:

[0044] In the embodiment of this application, by adopting the method of adding the wrinkled structure 20, and setting several of the wrinkled structures 20 deviated from the symmetry axis of the semi-circular convex hull 10, and开槽设置 here should be something like "grooved" according to the context, and it is set to form a composite micro-structure with several arc-shaped grooves evenly distributed from the upper surface of the semi-circular convex hull 10 to the bottom of the outer edge of the semi-circular convex hull 10. While having the function of the microlens focusing light to the focal point, the purpose of further disrupting the light distribution by using the wrinkled structure 20 is achieved, thereby realizing the technical effect of enhancing the uniformity and shielding effect of the image while maintaining high brightness. Furthermore, it solves the problems of high cost, complex processing technology and light interference defects existing in the existing diffusion film in improving the uniformity of LED light sources, and the technical problem that the traditional structure has limited improvement in the image uniformity and shielding effect. [[ID=!17]]

[0045] As Figure 4 shown, the semi-circular convex hull 10 is a hemispherical structure, the radius R1 of the hemispherical structure is 5 - 30 μm, and its height H satisfies (R1) / 2 ≤ H ≤ R1. It can be understood that setting the range of the radius R1 of the hemispherical structure to 5 - 30 μm can ensure a sufficient optical action area and is convenient for the realization of the processing technology; at the same time, it can also achieve the effect of having multiple sizes available for selection, so as to meet the needs of various usage scenarios and further improve the practicability.

[0046] Set the range of the height H of the hemispherical structure to (R1) / 2 ≤ H ≤ R1; for example, when H = R1, at this time, the hemisphere is a standard hemispherical shape;

[0047] When (R1) / 2 ≤ H < R1, at this time, the hemisphere is in a slightly flattened spherical cap shape, which can achieve the effect of adjusting the optical focal length and the incident angle distribution.

[0048] [[ID=!29]]As Figure 5 It should be noted that in the translation of item , the expression "开槽设置" needs to be further determined according to the accurate technical term in the original text. Here, a rough translation "grooved" is used for reference. You can adjust it according to the actual situation.As shown, the pleated structure 20 is a cylindrical hole structure. It is understandable that each pleated structure 20 is a cylindrical hole structure and is directly opened on the spherical surface of the hemisphere to form a specific light transmission or refraction channel.

[0049] Furthermore, the radius R2 of the cylindrical bottom surface of the pleated structure 20 is 1-5 μm;

[0050] The radius R1 of the hemispherical structure is not equal to the radius R2 of the cylindrical base. It is understood that the radius R2 of the cylindrical base is 1-5 μm, which is smaller than the hemispherical radius R1, ensuring that the disturbance to the overall structure is precisely controllable and that a good molding effect is achieved.

[0051] At the same time, R1 and R2 are set to be unequal, that is, R1 and R2 are not 5 μm at the same time, so as to avoid resonance or interference anomaly between the optical effect of the lens and the size of the microstructure.

[0052] Furthermore, the distance A1 between the center O of the cylindrical bottom surface of the pleated structure 20 and the edge of the hemisphere is 0-5 μm. It can be understood that a variety of processing positions can be selected, thereby achieving the effect of processing various shapes.

[0053] For example: when the distance A1 is 0, the center O of the base of the cylinder coincides with the edge of the hemisphere.

[0054] Of course, in order to ensure a good shaping effect of the bottom of the pleated structure 20, the position of the center O does not exceed the position of the outer edge of the bottom of the hemisphere.

[0055] Furthermore, the cylindrical inclination angle α1 of the pleated structure 20 is 0° < α1 ≤ 90°, and neither the cylinder nor its extended state extends beyond the center of the hemispherical dome. It will be appreciated that this inclination ensures that light passing through the cylindrical aperture undergoes directional refraction or scattering, thereby optimizing the spot shape and illumination uniformity. Furthermore, neither the cylinder nor its extended state extends beyond the center of the hemispherical dome, preventing weakening of the lens' primary focusing function.

[0056] Furthermore, the tilt angle α1 is a specified angle or a gradual angle. It is understandable that the effects of various processing methods can be provided.

[0057] Furthermore, the number of the plurality of pleated structures 20 is 3-10. It is understood that the number of pleated structures 20 on each hemisphere is 3-10, which can form significant optical interference / diffraction control while avoiding the effect of mechanical strength reduction caused by overly dense structures. At the same time, the pleats are evenly or specifically offset along the circumference of the bottom of the hemisphere to form a controllable optical phase modulation pattern.

[0058] Of course, by adjusting the number of folds, the brightness, uniformity and shielding can be adjusted, which has good flexibility.

[0059] The present application also relates to an optical film, comprising the microlens optical structure as described above;

[0060] It also includes: a substrate layer, which is arranged on the light incident side of the microlens optical structure.

[0061] Specifically, the substrate layer refers to the basic material or base to which the optical film or coating is attached, which can achieve good fixing and supporting effects; at the same time, it can also cooperate with other film layer structures to achieve multiple functional effects.

[0062] Furthermore, the substrate layer is polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride or polystyrene. It is understood that by providing a variety of materials to choose from, a flexible selection effect can be achieved, thereby being able to meet various usage requirements.

[0063] Furthermore, the number of microlens optical structures is multiple, and the multiple microlens optical structures are distributed on the substrate layer in a matrix, densely distributed, or randomly distributed manner. It is understood that a variety of distribution forms can be selected to achieve the effect of meeting various usage requirements; at the same time, by adopting different distribution forms, the corresponding required optical performance can be obtained.

[0064] Specifically, when the microlens optical structure is arranged in a regular and orderly manner, it can ensure the consistency of optical properties and avoid local optical performance unevenness; at the same time, it facilitates manufacturing process control and improves the repeatability and stability of the optical effect of the optical film.

[0065] When the microlens optical structure is densely distributed, the optical coverage can be improved.

[0066] When the microlens optical structure adopts random distribution, the interference effect can be reduced, angle cutting can be avoided, and the product area utilization rate can be improved.

[0067] In order to better understand and explain this application, the following examples are given to further illustrate:

[0068] The present invention demonstrates the technical effects of the present invention by comparing the brightness and shielding properties of different embodiments and comparative examples, and the brightness percentage is based on the brightness of Example 1.

[0069] Test method:

[0070] 1. Brightness: Use BM-7 to measure the brightness at the center of the backlight source.

[0071] 2. Shielding: Cover the diaphragm on the dot-line gauge with a height interval of 2mm. Observe through the diaphragm and record the radius of the points that can be clearly seen. The larger the radius, the better the shielding.

[0072] Example 1

[0073] The width of the hemisphere radius R1 in the microlens structure is 10 μm, the radius R2 of the cylindrical bottom of the fold structure 20 is 1 μm, the distance A1 between the center O of the cylindrical bottom of the fold structure 20 and the edge of the hemisphere is 0 μm, the cylinder inclination angle α1 of the fold structure 20 is 5°, and the number of folds S is 3.

[0074] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 98.89% and shielding of 3mm.

[0075] Example 2

[0076] The difference from Example 1 is that the width of the hemispherical radius R1 in the microlens structure is 20 μm.

[0077] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 94.24% and shielding of 5mm.

[0078] Example 3

[0079] The difference from Example 1 is that the radius R2 of the cylindrical bottom surface of the pleated structure 20 is 3 μm.

[0080] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 97.56% and shielding of 3mm.

[0081] Example 4

[0082] The difference from Example 1 is that the radius R2 of the cylindrical bottom surface of the pleated structure 20 is 5 μm.

[0083] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 96.94% and shielding of 4mm.

[0084] Example 5

[0085] The difference from Example 1 is that the distance A1 between the center O of the cylindrical bottom surface of the pleated structure 20 and the edge of the hemisphere is 2 μm.

[0086] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 99.16% and shielding of 2.5 mm.

[0087] Example 6

[0088] The difference from Example 1 is that the distance A1 between the center O of the cylindrical bottom surface of the pleated structure 20 and the edge of the hemisphere is 4 μm.

[0089] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 99.37% and shielding of 1.5 mm.

[0090] Example 7

[0091] The difference from Example 1 is that the cylindrical inclination angle α1 of the pleated structure 20 is 15°.

[0092] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 92.43% and shielding of 2.5 mm.

[0093] Example 8

[0094] The difference from Example 1 is that the cylindrical inclination angle α1 of the pleated structure 20 is 30°.

[0095] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 91.38% and shielding of 2mm.

[0096] Example 9

[0097] The difference from Example 1 is that the number S of pleats is 6.

[0098] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 95.83% and shielding of 5mm.

[0099] Example 10

[0100] The difference from Example 1 is that the number S of pleats is ten.

[0101] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 93.36% and shielding of 6 mm.

[0102] Example 11

[0103] The difference from Example 1 is that the number S of folds is 10, and the cylindrical inclination angle α1 of each fold structure 20 changes evenly and gradually from 90° to 0°.

[0104] At this time, after testing, the performance parameters of the microlens optical film are: brightness of 95.61% and shielding of 7mm.

[0105] Comparative Example 1

[0106] The difference from Example 1 is that the traditional microlens has a hemispherical structure with a radius of 10 μm and a height of 10 μm.

[0107] At this time, after testing, the performance parameters of the microlens optical film are: brightness is 100%, and shielding is 1.5 mm.

[0108] The results of each embodiment and comparative example are shown in Table 1:

[0109]

[0110]

[0111] From the above test results we can see that:

[0112] 1. It can be seen from Examples 1-2 and Comparative Example 1 that, under the premise that other parameters remain unchanged, as the radius of the microlens structure continues to increase, the brightness decreases, but the shielding property improves.

[0113] 2. It can be seen from Examples 1, 3-4 and Comparative Example 1 that, under the premise that other parameters remain unchanged, as the radius R2 of the bottom surface of the pleated structure cylinder continues to increase, the brightness decreases slightly and the shielding property improves.

[0114] 3. It can be seen from Examples 1, 5-6 and Comparative Example 1 that, under the premise that other parameters remain unchanged, as the distance A1 between the center O of the bottom surface of the pleated cylinder and the edge of the hemisphere continues to increase, the brightness increases and the shielding property decreases.

[0115] 4. It can be seen from Examples 1, 7-8 and Comparative Example 1 that, under the premise that other parameters remain unchanged, as the cylindrical inclination angle α1 of the pleated structure continues to increase, the brightness decreases significantly and the shielding property decreases slightly.

[0116] 5. It can be seen from Examples 1, 9-10 and Comparative Example 1 that, under the premise that other parameters remain unchanged, as the number of wrinkles S continues to increase, the brightness continues to decrease and the shielding property is significantly improved.

[0117] 6. It can be seen from Examples 1, 10-11 and Comparative Example 1 that, under the premise that other parameters remain unchanged, as the cylindrical inclination angle α1 of each pleated structure gradually changes from 90° to 0°, the brightness decreases and the shielding property is significantly improved.

[0118] In summary, the results of the above embodiments show that compared with the traditional microlens architecture of Comparative Example 1, the present application effectively improves the shielding property of the film and the uniformity of the image while maintaining high brightness. That is, the present application utilizes the pleated structure on the microlens to effectively readjust the distribution of light passing through the optical film, thereby improving the shielding property of the film and the uniformity of the image while maintaining the center brightness, thereby achieving the design purpose.

[0119] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A microlens optical structure, characterized in that: include: a semicircular convex hull (10); and A plurality of pleated structures (20) are arranged on the spherical surface of the semicircular convex hull (10) and are evenly distributed along the circumferential direction of the bottom of the semicircular convex hull (10); Among them, several of the pleated structures (20) are arranged to deviate from the symmetry axis of the semicircular bulge (10), and are grooved from the upper surface of the semicircular bulge (10) to the bottom of the outer edge of the semicircular bulge (10) at a preset angle to form a composite microstructure with several evenly distributed arc-shaped grooves.

2. The microlens optical structure according to claim 1, wherein: The semicircular convex hull (10) is a hemispherical structure, the radius R1 of the hemispherical structure is 5-30 μm, and the height H thereof is (R1) / 2≤H≤R1.

3. The microlens optical structure according to claim 2, wherein: The pleated structure (20) is a cylindrical hole-digging structure.

4. The microlens optical structure according to claim 3, wherein: The radius R2 of the cylindrical bottom surface of the pleated structure (20) is 1-5 μm; The radius R1 of the hemispherical structure is not equal to the radius R2 of the cylindrical bottom surface.

5. The microlens optical structure according to claim 3, wherein: The distance A1 between the center O of the cylindrical bottom surface of the pleated structure (20) and the edge of the hemisphere is 0-5 μm.

6. The microlens optical structure according to claim 3, wherein: The cylindrical inclination angle α1 of the pleated structure (20) is 0°<α1≤90°, and the cylinder and its extended state do not exceed the dome center point of the hemisphere.

7. The microlens optical structure according to claim 6, wherein: The tilt angle α1 is a specified angle or a gradual angle.

8. The microlens optical structure according to claim 1, wherein: The number of the plurality of pleated structures (20) is 3-10.

9. An optical film, characterized in that comprising a microlens optical structure according to any one of claims 1 to 8; It also includes: a substrate layer, which is arranged on the light incident side of the microlens optical structure.

10. The optical film according to claim 9, wherein There are multiple microlens optical structures, and the multiple microlens optical structures are distributed on the substrate layer in a matrix, densely distributed or randomly distributed manner.

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