An engineering diffuser and a design method thereof

Abstract

The present invention discloses an engineering diffuser and a design method thereof, wherein the engineering diffuser comprises an optical substrate and a microlens array formed on the optical substrate, wherein the microlens array is composed of one or more groups of randomly arranged basic lenses, wherein a group of the basic lenses comprises one or more microlenses, and each of the microlenses has a random boundary; a group of the basic lenses comprises a plurality of microlenses with the same curvature, cone coefficient and aperture; a plurality of microlenses in a group of the basic lenses are randomly arranged on the surface of the optical substrate; and random different regions of each microlens in one or more groups of the basic lenses are randomly arranged to form the microlens array. The engineering diffuser provided by the present invention disrupts the periodic arrangement of lenses through a microlens array with random boundaries, reduces interference fringes caused by the influence of multi-beam interference of microlenses, and improves the uniformity of light spots.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an engineering diffusion sheet and a design method thereof. Background Art

[0002] In recent years, the demand for high-quality light sources in fields such as face recognition and three-dimensional detection has also increased. Lasers, as a high-quality light source, are also used in various application scenarios. From the characteristics of semiconductor lasers, it can be seen that the outgoing laser beam is a Gaussian distribution with a large divergence angle, and the divergence angles of the fast and slow axes are different, resulting in asymmetric intensity distribution in the fast and slow axis directions, which reduces the quality of the beam and limits the development and application of semiconductor lasers. Therefore, it is very important to homogenize the semiconductor laser beam. Microlens arrays are a type of engineering diffuser that is currently widely used. The advantage of this method is that it does not require high intensity distribution of the incident light, has strong adaptability, and has the advantages of high energy utilization. However, ordinary microlens arrays also have disadvantages such as interference fringes and low filling factor. These disadvantages also make the optical performance of diffusers with microlens arrays at this stage need to be improved.

[0003] Therefore, it is urgent to propose a new technical solution to solve the problems existing in the prior art. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art. On the one hand, it is to provide an engineering diffuser to solve the problems of interference fringes and low filling factor in the engineering diffuser with a microlens array made in the prior art. On the other hand, it is to provide a design method for an engineering diffuser to reduce the difficulty of the manufacturing process while solving the interference fringes. The specific technical solutions adopted are as follows:

[0005] An engineered diffuser comprises an optical substrate and a microlens array formed on the optical substrate, wherein the microlens array is composed of one or more groups of randomly arranged basic lenses, a group of the basic lenses comprises one or more microlenses, and each microlens has a random boundary.

[0006] Preferably, in the above technical solution, the optical substrate is a transparent substrate, the microlens array is randomly formed on a surface of one side of the optical substrate, and a plurality of microlenses constituting the microlens array are closely arranged on the optical substrate.

[0007] Preferably, each group of the basic lenses is composed of a plurality of microlenses having the same curvature, cone coefficient, and aperture.

[0008] Preferably, each microlens in each group of the basic lenses is randomly arranged on the surface of the optical substrate.

[0009] Preferably, any one microlens in one group of basic lenses among the multiple groups of basic lenses constituting the microlens array has a different curvature and / or cone coefficient and / or aperture from any one microlens in another group of basic lenses among the multiple groups of basic lenses constituting the microlens array.

[0010] Preferably, the random different regions of each microlens in each group of the basic lenses are randomly arranged to form the microlens array, and the random different regions of each microlens serve as sub-lenses constituting the microlens array.

[0011] Preferably, the random different areas of each microlens in each group of the basic lenses include: an upper left area, a lower left area, an upper right area and a lower right area, an upper left sub-lens is obtained from the upper left area of ​​each microlens, a lower left sub-lens is obtained from the lower left area of ​​each microlens, an upper right sub-lens is obtained from the upper right area of ​​each microlens, and a lower right sub-lens is obtained from the lower right area of ​​each microlens, and the proportions of the upper left sub-lens, the lower left sub-lens, the upper right sub-lens and the lower right sub-lens in each group of the basic lenses constituting the microlens array are equal; or,

[0012] The random different areas of each microlens in each group of the basic lenses include: an upper left area, a lower left area, an upper right area, a lower right area and a central area, a central sub-lens is obtained from the central area of ​​each microlens, the proportions of the upper left sub-lens, the lower left sub-lens, the upper right sub-lens and the lower right sub-lens in each group of the basic lenses constituting the microlens array are equal, and the total number of the central sub-lenses in one or more groups of the basic lenses constituting the microlens array does not exceed 50% of the total number of the sub-lenses constituting the microlens array.

[0013] Preferably, closely arranged polygons are formed on the optical substrate, the boundaries of the polygons are random, one sub-lens is filled in each of the polygons, and the boundary of the sub-lens is the minimum circumscribed rectangle of the boundary of the polygon.

[0014] Preferably, the center points of the microlenses arranged in a row or a column are randomly distributed within a predetermined range on both sides of a straight line.

[0015] Preferably, the upper limit value of the predetermined range is 1 / 10 of the aperture size of the microlens with the largest aperture among the microlenses arranged in a row or a column, and the lower limit value of the predetermined range is 0.

[0016] The present invention also provides a design method for an engineering diffuser, which comprises:

[0017] Determine the boundaries of each microlens arranged to form a microlens array,

[0018] determining one or more groups of basic lenses constituting the microlens array, wherein a group of the basic lenses is composed of one or more microlenses,

[0019] Selecting random different regions of each microlens in the one or more groups of basic lenses, and filling them into the boundary range of each microlens constituting the microlens array, wherein the size of the random different regions of each microlens in the one or more groups of basic lenses is larger than the size of the boundary of the microlens constituting the microlens array.

[0020] The above technical solution also includes:

[0021] A method for determining boundaries of individual microlenses arranged to form a microlens array, comprising:

[0022] If it is determined that the boundaries of each microlens arranged to form a microlens array are random quadrilaterals, then:

[0023] Form a rectangular grid array pattern with M rows and N columns,

[0024] The X coordinate value and / or Y coordinate value of each point in the rectangular grid array pattern is randomly enlarged by 0 to 0.1 times the length of the grid side to obtain the updated coordinate point of each point,

[0025] The updated coordinate points of two adjacent points are connected sequentially to obtain a random quadrilateral boundary.

[0026] The above technical solution also includes:

[0027] A method for determining boundaries of individual microlenses arranged to form a microlens array, comprising:

[0028] If it is determined that the boundaries of each microlens arranged to form a microlens array are Thiessen polygons, then:

[0029] The microlenses constituting the microlens array are arranged in odd-numbered columns with P and even-numbered columns with P+1, wherein each microlens in each column is randomly selected.

[0030] The X coordinate value and / or Y coordinate value of the center point of each microlens in each column is randomly enlarged by 0 to 0.1 times the length or width of the microlens to obtain an updated coordinate point of the center point of each microlens,

[0031] Any two adjacent updated coordinate points among the updated coordinate points of each microlens center point are connected to create a perpendicular bisector of the line connecting the two adjacent updated coordinate points, and multiple perpendicular bisectors obtained thereby are interlaced and connected to obtain a Thiessen polygon boundary.

[0032] Compared with the prior art, the engineering diffuser provided by the present invention disrupts the periodic arrangement of lenses through a microlens array with random boundaries, reduces interference fringes caused by the influence of multi-beam interference of microlenses, and improves the uniformity of the light spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is a schematic diagram of the homogenized light spot of an ordinary microlens array generated by closely arranging microlenses of the same specifications. The aperture of the microlenses that make up the ordinary microlens array is 60μm and the curvature is 52mm. -1 , the cone coefficient is -1.02;

[0035] Figure 2 yes Figure 1 Light intensity distribution curves of horizontal and vertical sections in the schematic diagram of the homogenized light spot;

[0036] Figure 3 is a schematic diagram of the formation process of the random quadrilateral boundary of the present invention in one embodiment, wherein the dotted line represents the array boundary of the initial design, and the solid line represents the random boundary evolved from the dotted line;

[0037] Figure 4 is a partial schematic diagram of the Thiessen polygon boundary of the present invention in one embodiment;

[0038] Figure 5 is a grayscale image of a base lens of the microlens array of the present invention in one embodiment;

[0039] Figure 6 is a schematic diagram of a random quadrilateral microlens array composed of a group of basic lenses in one embodiment, wherein the group of basic lenses is composed of a plurality of lenses A having the same curvature, conic coefficient and aperture;

[0040] Figure 7 is a schematic diagram of a random quadrilateral microlens array composed of four groups of basic lenses in an embodiment, wherein the four groups of basic lenses are: a first group of basic lenses composed of a plurality of lenses A having the same curvature, cone coefficient and aperture, a second group of basic lenses composed of a plurality of lenses B having the same curvature, cone coefficient and aperture, a third group of basic lenses composed of a plurality of lenses C having the same curvature, cone coefficient and aperture, and a fourth group of basic lenses composed of a plurality of lenses D having the same curvature, cone coefficient and aperture;

[0041] Figure 8 is a schematic diagram of a Thiessen polygon microlens array composed of a group of basic lenses in one embodiment, wherein the group of basic lenses is composed of a plurality of lenses A having the same curvature, cone coefficient and aperture;

[0042] Fig. 9 is a schematic diagram of a Thiessen polygon microlens array composed of four groups of basic lenses in an embodiment, wherein the four groups of basic lenses are: a first group of basic lenses composed of a plurality of lenses A having the same curvature, cone coefficient and aperture, a second group of basic lenses composed of a plurality of lenses B having the same curvature, cone coefficient and aperture, a third group of basic lenses composed of a plurality of lenses C having the same curvature, cone coefficient and aperture, and a fourth group of basic lenses composed of a plurality of lenses D having the same curvature, cone coefficient and aperture;

[0043] Figures 10a to 10d is a schematic diagram of the region division of random different regions of any microlens in a set of basic lenses in one embodiment, wherein: Fig.10a The dotted box is the upper left area of ​​the microlens. Fig.10b The dotted box is the upper right area of ​​the microlens. Fig.10c The dotted box is the lower left area of ​​the microlens. Fig.10d The dotted box is the lower right area of ​​the microlens. Figures 10a to 10d The solid line in represents the boundary of a random quadrilateral, and the dashed line is the circumscribed quadrilateral of the solid line;

[0044] Fig.11 In one embodiment, Figures 10a to 10d Grayscale image of a random quadrilateral microlens array composed of randomly arranged microlenses in different divided areas;

[0045] Fig.12 yes Fig.11 Schematic diagram of the homogenized light spot of the random quadrilateral microlens array composed of the microlenses in the random quadrilateral microlens array. The diameter of the microlenses constituting the random quadrilateral microlens array is 60μm and the curvature is 52mm. -1 , the cone coefficient is -1.02;

[0046] Fig.13 yes Fig.12 Light intensity distribution curves of horizontal and vertical sections in the schematic diagram of the homogenized light spot. DETAILED DESCRIPTION

[0047] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The gist of the present invention is further explained below with reference to the accompanying drawings and embodiments.

[0051] Embodiment 1:

[0052] like Figure 1-2 As shown, Figure 1 This is a schematic diagram of the homogenized light spot of an ordinary microlens array generated by closely arranging microlenses of the same specifications. The aperture of the microlenses that make up the ordinary microlens array is 60μm and the curvature is 52mm. -1 , the cone coefficient is -1.02; Figure 2 yes Figure 1 The light intensity distribution curves of the horizontal and vertical sections in the schematic diagram of the homogenized light spot. It can be seen that there are many interference fringes in the homogenized light spot of the existing ordinary microlens array. This is because the homogenized light spot is affected by the interference of multiple beams due to the periodic arrangement of the existing ordinary microlens array and the coherence of the laser, resulting in more interference fringes, and these interference fringes affect the homogenization effect of the diffuser on the light beam. Figure 2 It can also be seen intuitively that the light intensity distribution of the horizontal and vertical cross sections of the light spot obtained by the ordinary microlens array fluctuates greatly, which will lead to uneven brightness of the overall light spot.

[0053] See also Figure 3-13 The present invention provides an engineering diffuser, which can reduce the periodic arrangement of the microlens array and the coherence of the laser, improve the uniformity of the light spot, and reduce the generation of interference fringes. The specific scheme is as follows:

[0054] An engineering diffuser comprises: an optical substrate, a microlens array formed on the optical substrate, wherein the microlens array is composed of one or more groups of randomly arranged basic lenses, a group of the basic lenses comprises one or more microlenses, and each microlens has a random boundary.

[0055] In one embodiment, a group of said basic lenses is composed of a plurality of micro lenses with the same curvature, cone coefficient and aperture. Figure 6 and Figure 8 , Figure 6 That is, it is a schematic diagram of a random quadrilateral microlens array composed of a group of basic lenses, wherein the group of basic lenses is composed of a plurality of lenses A having the same curvature, cone coefficient and aperture. Figure 8 That is, a schematic diagram of a Thiessen polygon microlens array composed of a group of basic lenses, wherein the group of basic lenses is composed of a plurality of lenses A with the same curvature, cone coefficient and aperture. A plurality of microlenses in a group of the basic lenses are randomly arranged on the surface of the optical substrate. The random arrangement can make the boundaries of the microlenses random, which helps to break the periodicity of the microlens array and reduce the generation of interference fringes.

[0056] In one embodiment, any one microlens in one group of the multiple groups of basic lenses constituting the microlens array has a different curvature and / or cone coefficient and / or aperture from any one microlens in another group of the multiple groups of basic lenses constituting the microlens array. Figure 7 To understand, Figure 7 Schematic diagram of a random quadrilateral microlens array composed of four groups of basic lenses, wherein the four groups of basic lenses are: a first group of basic lenses composed of a plurality of lenses A having the same curvature, cone coefficient and aperture, a second group of basic lenses composed of a plurality of lenses B having the same curvature, cone coefficient and aperture, a third group of basic lenses composed of a plurality of lenses C having the same curvature, cone coefficient and aperture, and a fourth group of basic lenses composed of a plurality of lenses D having the same curvature, cone coefficient and aperture, that is, Figure 7 The lenses A, B, C and D have different curvatures and / or cone coefficients from each other; the lenses A, B, C and D can be arranged irregularly, and the probabilities of the lenses A, B, C and D are basically the same. Such multiple groups of different basic lenses can make the light spot more uniform.

[0057] See also Fig. 9 To understand, Fig. 9 is a schematic diagram of a Thiessen polygon microlens array composed of four groups of basic lenses in one embodiment, wherein the four groups of basic lenses are: a first group of basic lenses composed of a plurality of lenses A having the same curvature, cone coefficient and aperture, a second group of basic lenses composed of a plurality of lenses B having the same curvature, cone coefficient and aperture, a third group of basic lenses composed of a plurality of lenses C having the same curvature, cone coefficient and aperture, and a fourth group of basic lenses composed of a plurality of lenses D having the same curvature, cone coefficient and aperture. That is, Fig. 9 The lens A, lens B, lens C and lens D have different curvatures and / or conic coefficients. As can be seen from the above, Figure 7 and Fig. 9 Four groups of basic lenses are selected for illustration. Of course, 3-5 groups, 5-10 groups of basic lenses, etc. can also be selected for illustration, which will not be repeated here.

[0058] In one embodiment, the shape of the microlenses constituting the microlens array may be any polygon, such as a quadrilateral, a pentagon, a hexagon, etc., or any shape formed by Thiessen polygons. Thiessen polygons, also known as Voronoi diagrams, are a set of continuous polygons composed of perpendicular bisectors connecting two adjacent line segments, and the distance from any point on the edge to the corresponding control point is equal.

[0059] In the present invention, the random different regions of each microlens in each group of the basic lenses are randomly arranged to form the microlens array, and the random different regions of each microlens serve as sub-lenses constituting the microlens array. In one embodiment, the random different regions of each microlens in one or more groups of the basic lenses include: an upper left region, a lower left region, an upper right region, and a lower right region. An upper left sub-lens is obtained from the upper left region of each microlens, a lower left sub-lens is obtained from the lower left region of each microlens, an upper right sub-lens is obtained from the upper right region of each microlens, and a lower right sub-lens is obtained from the lower right region of each microlens. The proportions of the upper left sub-lens, the lower left sub-lens, the upper right sub-lens, and the lower right sub-lens in each group of the basic lenses constituting the microlens array are equal. See also Figures 10a to 10d : Fig.10a The dotted box is the upper left area of ​​the microlens. Fig.10b The dotted box is the upper right area of ​​the microlens. Fig.10c The dotted box is the lower left area of ​​the microlens. Fig.10d The dotted box is the lower right area of ​​the microlens. Figures 10a to 10dThe solid line in the figure represents the random quadrilateral boundary, and the dotted line represents the circumscribed quadrilateral of the solid line. A closely arranged polygon may be formed on the optical substrate, the polygon boundary is random, each of the polygons is filled with a sub-lens, and the boundary of the sub-lens is the minimum circumscribed rectangle of the polygon boundary. That is, each microlens in each group of basic lenses is divided into 4 regions, and the size of each region is larger than the size of the microlens to be arranged to form a microlens array (i.e. Figures 10a to 10d The solid line range is the size of the microlenses that are expected to be arranged to form the microlens array, and the area divided on the microlens is bounded by the dotted line, and the dotted line boundary is the circumscribed quadrilateral of the solid line boundary); each microlens in each group of basic lenses is divided into 4 areas according to this method, and then any one of the upper left sub-lens, lower left sub-lens, upper right sub-lens, and lower right sub-lens obtained by the division is randomly filled into the pre-designed random quadrilateral microlens array.

[0060] The method of dividing the area described in this embodiment is to separate the parts of the lens, and then use a batch of separated microlens small units as modules to form a microlens array group, and then randomly select one or more of these microlens small units, and then randomly fill and arrange them to form a random microlens array. Figure 11-13 , Fig.11 In one embodiment, Figures 10a to 10d Grayscale image of a random quadrilateral microlens array composed of randomly arranged microlenses in different divided areas. Fig.12 yes Fig.11 Schematic diagram of the homogenized light spot of the random quadrilateral microlens array composed of the microlenses in the random quadrilateral microlens array. The diameter of the microlenses constituting the random quadrilateral microlens array is 60μm and the curvature is 52mm. -1 , the cone coefficient is -1.02, Fig.13 yes Fig.12 The light intensity distribution curves of the horizontal and vertical sections in the schematic diagram of the homogenized light spot are given by Figure 11-13 It can be found that the homogenized light spot of the diffuser disclosed in the present invention is more uniform, and the interference fringes are Figure 1 There is a significant decrease compared to Fig.13 and Figure 2 By comparison, it can also be found that the fluctuation range of the light intensity of the horizontal and vertical sections of the homogenized light spot of the diffuser disclosed in the present invention is smaller, indicating that the brightness of the light spot is more uniform and the optical effect of the diffuser is better. Therefore, after comprehensive comparison, the optical effect of the diffuser proposed in the present invention is improved as a whole compared with the existing diffuser.

[0061] In one embodiment, the diffuser of the present invention includes an optical substrate, which is a transparent substrate. The microlens array is randomly etched on a surface of one side of the optical substrate, and a plurality of microlenses constituting the microlens array are closely arranged on the optical substrate.

[0062] In one embodiment, the center points of the microlenses arranged in a row or a column in the microlens array of the present invention are randomly distributed within a predetermined range on both sides of a straight line. In one case, the upper limit value of the predetermined range is 1 / 10 of the aperture size value of the microlens with the largest aperture among the microlenses arranged in a row or a column, and the lower limit value of the predetermined range is 0.

[0063] Embodiment 2:

[0064] In the present invention, the random different regions of each microlens in each group of the basic lenses are randomly arranged to form the microlens array. In one embodiment, the random different regions of each microlens in each group of the basic lenses include: an upper left region, a lower left region, an upper right region, a lower right region and a central region, an upper left sub-lens is obtained from the upper left region of each microlens, a lower left sub-lens is obtained from the lower left region of each microlens, an upper right sub-lens is obtained from the upper right region of each microlens, a lower right sub-lens is obtained from the lower right region of each microlens, and a central sub-lens is obtained from the central region of each microlens. The proportions of the upper left sub-lens, the lower left sub-lens, the upper right sub-lens and the lower right sub-lens in each group of the basic lenses constituting the microlens array are equal, and the total number of the central sub-lenses in one or more groups of the basic lenses constituting the microlens array does not exceed 50% of the total number of sub-lenses constituting the microlens array. That is, a microlens in a group of basic lenses is divided into 5 areas, the size of each area is larger than the size of the microlenses expected to be arranged to form a microlens array, each microlens in one or more groups of basic lenses is divided into 5 areas according to this method, and then any one of the upper left sub-lens, lower left sub-lens, upper right sub-lens, lower right sub-lens and central sub-lens obtained by division is randomly filled into a pre-designed random quadrilateral microlens array.

[0065] The method of dividing the regions described in this embodiment is also to separate the parts of the lens, and then use a batch of separated microlens small units as modules to form a microlens array group, and then randomly select one or more of these microlens small units, and then randomly fill and arrange them to form a random microlens array. However, compared with Example 1, this embodiment divides a microlens into 5 regions, and the total number of the central sub-lenses in one or more groups of the basic lenses constituting the microlens array does not exceed 50% of the total number of sub-lenses constituting the microlens array.

[0066] Embodiment 3:

[0067] See also Figure 3-13 The present invention also provides a design method for an engineering diffuser, which comprises the following steps:

[0068] A. Determine the boundaries of each microlens arranged to form a microlens array,

[0069] B. determining one or more groups of basic lenses constituting the microlens array, wherein one group of basic lenses is composed of one or more microlenses,

[0070] C. Selecting random different regions of each microlens in the one or more groups of basic lenses, and filling them into the boundary range of each microlens constituting the microlens array, wherein the size of the random different regions of each microlens in the one or more groups of basic lenses is larger than the size of the boundary of the microlenses constituting the microlens array.

[0071] In one embodiment, a method for determining the boundaries of each microlens arranged to form a microlens array includes:

[0072] If the boundaries of each microlens arranged to form a microlens array are determined to be random quadrilaterals, then see Figure 3 :

[0073] First, a rectangular grid array pattern with M rows and N columns is formed.

[0074] Then, the X coordinate value and / or Y coordinate value of each point in the rectangular grid array pattern is randomly expanded by 0 to 0.1 times the grid side length to obtain the updated coordinate point of each point.

[0075] Then, the updated coordinate points of two adjacent points are sequentially connected to obtain a random quadrilateral boundary.

[0076] In another embodiment, a method for determining boundaries of microlenses arranged to form a microlens array includes:

[0077] If the boundaries of each microlens arranged to form a microlens array are determined to be Thiessen polygons, then see Figure 4 :

[0078] First, the microlenses constituting the microlens array are arranged in odd-numbered columns with P and even-numbered columns with P+1, wherein each microlens in each column is randomly selected.

[0079] Then, the X coordinate value and / or Y coordinate value of the center point of each microlens in each column is randomly expanded by 0 to 0.1 times the length or width of the microlens to obtain an updated coordinate point of the center point of each microlens.

[0080] Then, any two adjacent updated coordinate points of the updated coordinate points of each microlens center point are connected to make a perpendicular bisector of the line connecting the two adjacent updated coordinate points, and multiple perpendicular bisectors obtained in this way are interlaced and connected to obtain the Thiessen polygon boundary.

[0081] In summary, the diffuser provided by the present invention produces different vector heights that disrupt the periodic arrangement through random boundaries, and different curvatures and cone coefficients formed by multiple groups of basic lenses, reduces the interference fringes caused by the influence of multi-beam interference behind the microlens, improves the uniformity of the light spot, and improves the overall optical effect of the diffuser.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0083] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. An engineering diffuser, characterized in that: It includes: Optical substrates, A microlens array formed on the optical substrate, wherein the microlens array is composed of one or more groups of randomly arranged basic lenses, a group of the basic lenses includes one or more microlenses, and each microlens has a random boundary; The random different regions of each microlens in each group of the basic lenses are randomly arranged to form the microlens array, and the random different regions of each microlens serve as sub-lenses constituting the microlens array; The random different areas of each microlens in each group of the basic lenses include: an upper left area, a lower left area, an upper right area and a lower right area, an upper left sub-lens is obtained from the upper left area of ​​each microlens, a lower left sub-lens is obtained from the lower left area of ​​each microlens, an upper right sub-lens is obtained from the upper right area of ​​each microlens, and a lower right sub-lens is obtained from the lower right area of ​​each microlens, and the proportions of the upper left sub-lens, the lower left sub-lens, the upper right sub-lens and the lower right sub-lens in each group of the basic lenses constituting the microlens array are equal; or, The random different areas of each microlens in each group of the basic lenses include: an upper left area, a lower left area, an upper right area, a lower right area and a central area, a central sub-lens is obtained from the central area of ​​each microlens, the proportions of the upper left sub-lens, the lower left sub-lens, the upper right sub-lens and the lower right sub-lens in each group of the basic lenses constituting the microlens array are equal, and the total number of the central sub-lenses in one or more groups of the basic lenses constituting the microlens array does not exceed 50% of the total number of the sub-lenses constituting the microlens array.

2. The engineering diffuser according to claim 1, characterized in that: The optical substrate is a transparent substrate, the microlens array is randomly formed on a surface of one side of the optical substrate, and a plurality of microlenses constituting the microlens array are closely arranged on the optical substrate; Each group of basic lenses is composed of a plurality of micro lenses with the same curvature, cone coefficient, and aperture; Each microlens in each group of the basic lenses is randomly arranged on the surface of the optical substrate.

3. The engineering diffuser according to claim 1, characterized in that: Any one microlens in one group of basic lenses among the multiple groups of basic lenses constituting the microlens array has a different curvature and / or cone coefficient and / or aperture from any one microlens in another group of basic lenses among the multiple groups of basic lenses constituting the microlens array.

4. The engineering diffuser according to claim 1, characterized in that: A closely arranged polygon is formed on the optical substrate, the borders of the polygon are random, one sub-lens is filled in each of the polygons, and the border of the sub-lens is the minimum circumscribed rectangle of the border of the polygon.

5. The engineering diffuser according to claim 1, characterized in that: The center points of the microlenses arranged in a row or column are randomly distributed within a predetermined range on both sides of a straight line; The upper limit value of the predetermined range is 1 / 10 of the aperture size value of the microlens with the largest aperture among the microlenses arranged in a row or a column, and the lower limit value of the predetermined range is 0.

6. A design method for an engineering diffuser according to any one of claims 1 to 5, characterized in that: It includes: Determine the boundaries of each microlens arranged to form a microlens array, determining one or more groups of basic lenses constituting the microlens array, wherein a group of the basic lenses is composed of one or more microlenses, Selecting random different regions of each microlens in the one or more groups of basic lenses, and filling them into the boundary range of each microlens constituting the microlens array, wherein the size of the random different regions of each microlens in the one or more groups of basic lenses is larger than the size of the boundary of the microlens constituting the microlens array.

7. The design method of an engineering diffuser according to claim 6, characterized in that: It also includes: A method for determining boundaries of individual microlenses arranged to form a microlens array comprises: If it is determined that the boundaries of each microlens arranged to form a microlens array are random quadrilaterals, then: Form a rectangular grid array pattern with M rows and N columns, The X coordinate value and / or Y coordinate value of each point in the rectangular grid array pattern is randomly enlarged by 0 to 0.1 times the length of the grid side to obtain the updated coordinate point of each point, The updated coordinate points of two adjacent points are connected sequentially to obtain a random quadrilateral boundary.

8. The method for designing an engineering diffuser according to claim 6, characterized in that: It also includes: A method for determining boundaries of individual microlenses arranged to form a microlens array, comprising: If it is determined that the boundaries of each microlens arranged to form a microlens array are Thiessen polygons, then: The microlenses constituting the microlens array are arranged in odd-numbered columns with P and even-numbered columns with P+1, wherein each microlens in each column is randomly selected. The X coordinate value and / or Y coordinate value of the center point of each microlens in each column is randomly enlarged by 0 to 0.1 times the length or width of the microlens to obtain an updated coordinate point of the center point of each microlens, Any two adjacent updated coordinate points among the updated coordinate points of each microlens center point are connected to create a perpendicular bisector of the line connecting the two adjacent updated coordinate points, and multiple perpendicular bisectors obtained thereby are interlaced and connected to obtain a Thiessen polygon boundary.

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