Optical diffusion sheet with randomly eccentric micro-lens units and design method

Abstract

The invention relates to an optical diffusion sheet with randomly eccentric micro-lens units and a design method, and relates to the technical field of optics, the optical diffusion sheet comprises a substrate and a micro-lens array arranged on the substrate, the micro-lens array comprises a plurality of subunits with the same size and curvature radius, and the plurality of subunits have different eccentric values. The plurality of subunits are arranged in a rectangular manner, and two adjacent subunits in the micro-lens array are seamlessly spliced. The method comprises the following steps: firstly, determining the curvature and arrangement period of subunits according to a selected divergence angle requirement; secondly, selecting circular or hexagonal micro-lenses with set sizes and curvature radiuses as sub-units, and splicing a plurality of sub-units into a micro-lens array; then, a plurality of subunits are respectively endowed with random eccentric values, so that the subunits deviate from the original positions; and finally, two adjacent subunits in the micro-lens array are seamlessly spliced. According to the optical diffusion sheet, light spots can be better homogenized, the distribution uniformity of the light spots is improved, and the manufacturing mode is simple.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to an optical diffuser with randomly eccentric microlens units and a design method thereof. Background Art

[0002] Optical diffusers are also called homogenizers, light homogenizers or homogenizers. They can convert incident light into uniform light spots of any shape. The working principle of microlens array diffusers is based on the refraction of light: by arranging microlenses with specific curvature radius and shape on the surface of the diffuser, the incident light can be controlled, the energy distribution of the beam can be changed, and the light spot can be evenly diffused in the focal plane to provide a uniform surface light source.

[0003] However, the traditional optical diffuser not only needs to process the irregularities of the boundaries and surfaces of all units during production, but also has troublesome design and no guiding rules, long design cycle and low efficiency. Moreover, the optical diffuser produced by the traditional method still cannot achieve the effect of completely homogenizing the light spot, and further improvement is needed. Summary of the invention

[0004] In order to improve the effect of the optical diffuser in homogenizing the light spot while making the optical diffuser easier to manufacture and reducing the difficulty of manufacturing, the present application provides an optical diffuser with randomly eccentric microlens units and a design method.

[0005] The present application provides an optical diffuser with randomly eccentric microlens units and a design method using the following technical solutions:

[0006] An optical diffuser with randomly eccentric microlens units comprises a substrate and a microlens array arranged on the substrate, wherein the microlens array comprises a plurality of subunits, the subunits have the same size and radius of curvature, and the subunits have different eccentricity values, the subunits are arranged in a rectangular manner, and two adjacent subunits in the microlens array are seamlessly spliced.

[0007] Optionally, the plurality of sub-units have the same vector height, and the vector heights of the plurality of sub-units are all 7 microns.

[0008] Optionally, the subunit is circular or equihexagonal.

[0009] Optionally, the curvature radius of several of the sub-units is 1.5 microns.

[0010] Optionally, the lengths of the several subunits are all 0.18 microns, and the widths are all 0.16 microns.

[0011] A method for designing an optical diffuser with randomly eccentric microlens units comprises the following steps:

[0012] S1: determining the curvature and arrangement period of the sub-units used to splice into the microlens array according to the selected divergence angle requirement;

[0013] S2: selecting a circular or hexagonal microlens of a predetermined size and radius of curvature as a subunit, and splicing a plurality of the subunits into a microlens array in a rectangular array;

[0014] S3: assigning random eccentricity values ​​to a plurality of sub-units in the microlens array so as to deviate from their original positions;

[0015] S4: seamlessly splicing two adjacent sub-units in the microlens array, and making sure that the sub-units do not overlap.

[0016] Optionally, the eccentricity values ​​imparted to the subunits are all within the range of 5-20 microns.

[0017] Optionally, the plurality of sub-units located in the microlens array are all assigned different vector height values.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. This application adopts the random eccentricity method to design the structure of the optical diffuser, which is simpler to operate than the traditional method and greatly improves the design efficiency;

[0020] 2. This application can design a wide variety of optical diffusers according to the different needs of designers and can quickly respond to various design needs.

[0021] 3. The design of this application is regular, which facilitates the replication of the same effect and has high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a microlens array of an optical diffuser with randomly eccentric microlens units and a design method of the present application.

[0023] Figure 2 It is a schematic diagram of an optical diffuser with randomly eccentric microlens units and a design method of the present application after the microlens array is randomly eccentric.

[0024] Figure 3 It is a schematic diagram of the design process of an optical diffuser with randomly eccentric microlens units and a design method of the present application.

[0025] Figure 4 This is a diagram showing the effect of light spot homogenization of an optical diffuser with randomly eccentric microlens units and a design method of the present application.

[0026] Explanation of the reference numerals: 1, substrate; 2, microlens array; 21, subunit. DETAILED DESCRIPTION

[0027] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-4 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] The embodiments of the present application disclose an optical diffuser with randomly eccentric microlens units and a design method thereof.

[0029] Embodiment 1

[0030] This embodiment discloses an optical diffuser sheet in which microlens units are designed in a random eccentric manner.

[0031] Reference Figure 1 and Figure 2 , an optical diffuser with randomly eccentric microlens units, comprising a substrate 1 and a microlens array 2 arranged on the substrate 1. The microlens array 2 is formed by splicing a plurality of subunits 21 in a rectangular array to ensure that the formed microlens array 2 can be evenly distributed, so as to conveniently assign a random eccentricity value to each subunit 21. In order to ensure that the eccentricity of the plurality of subunits 21 is random, subunits 21 with the same size and radius of curvature are selected as the structure for splicing into microlenses. And the plurality of subunits 21 have different eccentricity values ​​respectively, so that the rectangular array of the microlens array 2 can be completely disrupted. Two adjacent subunits 21 in the microlens array 2 are seamlessly spliced. This design enables the parallel light passing through the microlens array 2 to be fully homogenized, improves the effect of homogenizing the light spot of the microlens array 2, and has better practicality.

[0032] Furthermore, several subunits 21 all have the same sagittal height, and the sagittal height is 7 microns. This design is to ensure that when parallel light is irradiated on the microlens array 2, the degree of homogenization of the light spot can be completely controlled by the eccentricity value, which is conducive to observing the specific influence of the random eccentricity value of the subunit 21 on the light spot, so as to screen out a suitable eccentricity value range. At the same time, the same sagittal height can also reduce the reflection and refraction of parallel light, so that the optical diffuser has a better light transmittance.

[0033] Preferably, the edges of the subunits 21 are all circular or hexagonal. After being assigned a random eccentricity value, the circular or hexagonal subunits 21 are more likely to form seamless splicing with adjacent subunits 21, making the operation more convenient.

[0034] Preferably, the curvature radius of the plurality of subunits 21 is 1.5 microns, because after the subunit 21 with a curvature radius of 1.5 microns is assigned a random eccentricity value, its edge position deforms more naturally, which facilitates the subsequent splicing of adjacent subunits 21 .

[0035] Preferably, the lengths of the plurality of subunits 21 are all 0.18 micrometers, and the widths are all 0.16 micrometers.

[0036] The design method of the optical diffuser is as follows: Figure 1-3 :

[0037] S1: determining the curvature and arrangement period of the subunits 21 used to splice into the microlens array 2 according to the selected divergence angle requirement;

[0038] S2: Selecting a circular or hexagonal microlens of a predetermined size and curvature radius as a subunit 21, and splicing a plurality of subunits 21 in a rectangular array to form a microlens array 2;

[0039] S3: assigning random eccentricity values ​​to a plurality of sub-units 21 in the microlens array 2 so as to deviate from their original positions;

[0040] S4: seamlessly splicing two adjacent sub-units 21 in the microlens array 2, and making sure that the sub-units 21 do not overlap.

[0041] By randomly assigning eccentricity values ​​to a number of subunits 21, the complex operation of irregularizing the boundaries and surfaces of each subunit 21 is avoided, making the design process regular and facilitating the repeated implementation of the design method.

[0042] At the same time, this design method can also shorten the design cycle of the optical diffuser and improve efficiency.

[0043] Reference Figure 1 and Figure 2 Preferably, the random eccentricity values ​​assigned to the subunits 21 on the microlens array 2 are all within the range of 5-20 microns. The microlens array 2 obtained within this range has the best spot homogenization effect.

[0044] The larger the eccentricity value within this range, the better the effect of the optical diffuser in homogenizing the light spot. However, the shape of the light spot will become more chaotic as the eccentricity value increases. In the actual design process, designers can appropriately scale the range of eccentricity values ​​according to actual needs to meet various design requirements.

[0045] Embodiment 2

[0046] Reference Figure 2 and Figure 4, the subunits 21 in the microlens array 2 are all assigned different vector height values. When the vector height has different random values, the designed optical diffuser can have a better effect of dissipating light spots.

[0047] The implementation principle of an optical diffuser with randomly eccentric microlens units and a design method of the present application is as follows:

[0048] First, the curvature and arrangement period of the subunits 21 used to splice into the microlens array 2 are determined according to the selected divergence angle requirement; secondly, circular or hexagonal microlenses of a given size and curvature radius are selected as subunits 21, and several subunits 21 are spliced ​​into the microlens array 2 in a rectangular array; then, several subunits 21 in the microlens array 2 are respectively given random eccentricity values ​​to deviate from their original positions; finally, two adjacent subunits 21 in the microlens array 2 are seamlessly spliced, and the several subunits 21 do not overlap. This design method has regularity, so that the scheme can be reproduced easily.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical diffuser with randomly eccentric microlens units, characterized in that: The invention comprises a substrate (1) and a microlens array (2) arranged on the substrate (1), wherein the microlens array (2) comprises a plurality of subunits (21), the plurality of subunits (21) have the same size and radius of curvature, and the plurality of subunits (21) have different eccentricity values, the plurality of subunits (21) are arranged in a rectangular manner, and two adjacent subunits (21) in the microlens array (2) are seamlessly spliced.

2. The optical diffuser with randomly eccentric microlens units according to claim 1, characterized in that: The plurality of subunits (21) have the same vector height, and the vector heights of the plurality of subunits (21) are all 7 micrometers.

3. The optical diffuser with randomly eccentric microlens units according to claim 2, characterized in that: The subunit (21) is circular or equihexagonal.

4. The optical diffuser with randomly eccentric microlens units according to claim 3, characterized in that: The curvature radius of the plurality of subunits (21) is 1.5 microns.

5. The optical diffuser with randomly eccentric microlens units according to claim 4, characterized in that: The length of the plurality of subunits (21) is 0.18 micrometers and the width is 0.16 micrometers.

6. A method for designing an optical diffuser with randomly eccentric microlens units according to claims 1 to 5, comprising the following steps: S1: determining the curvature and arrangement period of the subunits (21) used to splice into the microlens array (2) according to the selected divergence angle requirement; S2: selecting a circular or hexagonal microlens of a predetermined size and radius of curvature as a subunit (21), and splicing a plurality of the subunits (21) in a rectangular array to form a microlens array (2); S3: assigning random eccentricity values ​​to a plurality of subunits (21) located in the microlens array (2) so as to deviate from their original positions; S4: seamlessly splicing two adjacent sub-units (21) in the microlens array (2), with the plurality of sub-units (21) not overlapping.

7. The method for designing an optical diffuser with randomly eccentric microlens units according to claim 6, characterized in that: The eccentricity values ​​imparted to the subunits (21) are all within the range of 5-20 microns.

8. The method for designing an optical diffuser with randomly eccentric microlens units according to claim 6, characterized in that: The plurality of subunits (21) located in the microlens array (2) are all assigned different vector height values.

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