CN215116866U - Engineering diffusion sheet - Google Patents

Abstract

The utility model discloses an engineering diffusion sheet, the engineering diffusion sheet includes the optics substrate to and the microlens array that forms on the optics substrate, the microlens array is arranged at random by one set or multiunit basic lens and is constituteed, a set of basic lens includes one or more microlens, every microlens boundary is random; the group of basic lenses consists of a plurality of micro lenses with the same curvature, conical coefficient and caliber; a plurality of micro lenses in the group of base lenses are randomly arranged on the surface of the optical substrate; the randomly different regions of each microlens in one or more sets of the base lenses are randomly arranged to form the microlens array. The utility model provides an engineering diffusion piece has disturbed lens periodicity through the microlens array on random boundary and has arranged, reduces because of the interference fringe that the influence that many light beams of microlens interfered and brought produced, promotes the homogeneity of facula.

Description

Engineering diffusion sheet

Technical Field

The utility model relates to a show technical field, especially relate to an engineering diffusion piece.

Background

The fields of face recognition, three-dimensional detection and the like which rise in recent years have increasingly growing demands for high-quality light sources. The laser is also applied to various application scenes as a high-quality light source, and as can be known from the characteristics of the semiconductor laser, the emitted laser beam is gaussian distributed, the divergence angle is large, and the divergence angles of the fast and slow axes are different, so that the intensity distribution in the fast and slow axis direction is asymmetric, the quality of the beam is reduced, and the development and application of the semiconductor laser are limited, so that the homogenization of the beam of the semiconductor laser is very important. The micro lens array is an engineering diffusion sheet widely used at present, and the method has the advantages of low requirement on the light intensity distribution of incident light, strong adaptability and high energy utilization rate. However, the common microlens array also has the defects of interference fringes, low filling factor and the like, and the optical performance of the diffusion sheet with the microlens array at the present stage is still to be improved.

Therefore, it is necessary to provide a new technical solution to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that exists among the prior art, provide an engineering diffusion piece for there is interference line, the not high problem of fill factor in the engineering diffusion piece that has the microlens array that makes for solving among the prior art, and proposes a method of designing this engineering diffusion piece, in order to reduce the preparation technology degree of difficulty under the prerequisite of having solved interference line, the technical scheme of specifically adopting as follows:

an engineered diffuser sheet comprising an optical substrate, and a microlens array formed on said optical substrate, said microlens array consisting of one or more sets of base lenses arranged randomly, a set of said base lenses comprising one or more microlenses, each of said microlens boundaries being random.

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.

Preferably, each group of the base lenses is composed of a plurality of microlenses having the same curvature, conic coefficient, and aperture.

Preferably, each microlens of each group of the base lenses is randomly arranged on the surface of the optical substrate.

Preferably, any one of the base lenses of the plurality of base lenses constituting the microlens array and any one of the base lenses of the other of the base lenses of the plurality of base lenses constituting the microlens array have different curvatures and/or conic coefficients and/or calibers.

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

Preferably, the randomly different regions of each microlens in each set of the base lenses comprise: the micro-lens array comprises an upper left area, a lower left area, an upper right area and a lower right area, wherein an upper left sub-lens is obtained from the upper left area of each micro-lens, a lower left sub-lens is obtained from the lower left area of each micro-lens, an upper right sub-lens is obtained from the upper right area of each micro-lens, a lower right sub-lens is obtained from the lower right area of each micro-lens, 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 basic lenses forming the micro-lens array are equal; or the like, or, alternatively,

the randomly different regions of each microlens in each set of the base lenses comprise: the central sub-lens is obtained from the central area of each micro-lens, each group of the micro-lens array is formed, 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 the basic lens are equal, and one or more groups of the micro-lens array are formed, wherein the total number of the central sub-lenses in the basic lens is not more than 50% of the total number of the sub-lenses forming the micro-lens array.

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

Preferably, the central 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.

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

The utility model also provides a method of designing above-mentioned engineering diffusion piece, it includes:

the boundaries of the individual microlenses arranged to form the microlens array are determined,

determining one or more sets of base lenses that make up the microlens array, wherein a set of the base lenses is made up of one or more microlenses,

and selecting random different areas of each microlens in the one or more groups of basic lenses and filling the random different areas into the boundary range of each microlens forming the microlens array, wherein the size of the random different areas of each microlens in the one or more groups of basic lenses is larger than that of the boundary of each microlens forming the microlens array.

The above technical solution further includes:

a method of determining the boundaries of individual microlenses arranged to form a microlens array, comprising:

if the boundary of each microlens arranged to form the microlens array is determined to be a random quadrangle, then:

forming a rectangular grid array pattern of M rows and N columns,

randomly expanding the X coordinate value and/or the Y coordinate value of each point in the rectangular grid array graph by 0-0.1 time of the side length of the grid to obtain an updated coordinate point of each point,

and sequentially connecting the updated coordinate points of two adjacent points to obtain a random quadrilateral boundary.

The above technical solution further includes:

a method of determining the boundaries of individual microlenses arranged to form a microlens array, comprising:

if the boundary of each microlens arranged to form the microlens array is determined to be a Thiessen polygon, then:

arranging each microlens composing the microlens array according to P odd columns and P +1 even columns, wherein each microlens of each column is randomly selected,

randomly expanding the X coordinate value and/or the Y coordinate value of the central point of each microlens in each row by 0-0.1 times of the length or width of the microlens to obtain an updated coordinate point of the central point of each microlens,

connecting any two adjacent updated coordinate points in the updated coordinate points of the central point of each micro lens, manufacturing a vertical bisector of a connecting line of the two adjacent updated coordinate points, and mutually and alternately connecting a plurality of vertical bisectors obtained according to the manufacturing method to obtain the Thiessen polygon boundary.

Compared with the prior art, the utility model provides an engineering diffusion piece has disturbed lens periodicity through the microlens array on random boundary and has arranged, reduces because of the interference fringe that the influence that many light beams of microlens interfered and brought produced, promotes the homogeneity of facula.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view showing homogenized light spots of a general microlens array produced by closely arranging microlenses of the same specification, wherein the microlenses constituting the general microlens array have an aperture of 60 μm and a curvature of 52mm^-1The cone coefficient is-1.02;

FIG. 2 is a graph of intensity distribution for horizontal and vertical cross-sections of the homogenized light spot of FIG. 1;

FIG. 3 is a schematic diagram of the formation of random quadrilateral boundaries according to the present invention in one embodiment, wherein the dotted lines represent the boundaries of the array as originally designed, and the solid lines represent the random boundaries evolved from the dotted lines;

FIG. 4 is a partial schematic view of a Thiessen polygon boundary in one embodiment of the present invention;

FIG. 5 is a gray scale view of the base lens of the microlens array of the present invention in one embodiment;

FIG. 6 is a schematic diagram of a random quadrilateral microlens array composed of a set of base lenses composed of a plurality of lenses A of the same curvature, conic index and aperture in one embodiment;

FIG. 7 is a schematic diagram of a random quadrilateral microlens array consisting of four sets of base lenses in one embodiment, wherein the four sets of base lenses are: a first group of basic lenses consisting of a plurality of lenses A with the same curvature, conical coefficient and caliber, a second group of basic lenses consisting of a plurality of lenses B with the same curvature, conical coefficient and caliber, a third group of basic lenses consisting of a plurality of lenses C with the same curvature, conical coefficient and caliber, and a fourth group of basic lenses consisting of a plurality of lenses D with the same curvature, conical coefficient and caliber;

FIG. 8 is a schematic diagram of a Thiessen polygonal microlens array consisting of a set of base lenses consisting of a plurality of lenses A of the same curvature, conic index and aperture in one embodiment;

FIG. 9 is a schematic diagram of a Thiessen polygonal microlens array consisting of four sets of base lenses, in one embodiment: a first group of basic lenses consisting of a plurality of lenses A with the same curvature, conical coefficient and caliber, a second group of basic lenses consisting of a plurality of lenses B with the same curvature, conical coefficient and caliber, a third group of basic lenses consisting of a plurality of lenses C with the same curvature, conical coefficient and caliber, and a fourth group of basic lenses consisting of a plurality of lenses D with the same curvature, conical coefficient and caliber;

10 a-10 d are schematic diagrams of the division of regions of randomly different regions of any one microlens in a base set of lenses in one embodiment, wherein: FIG. 10a shows a left upper region of a microlens, FIG. 10b shows a right upper region of a microlens, FIG. 10c shows a left lower region of a microlens, and FIG. 10d shows a right lower region of a microlens, the solid lines in FIGS. 10a to 10d indicate random quadrilateral boundaries, and the dotted lines indicate a circumscribed quadrilateral of the solid lines;

FIG. 11 is a grayscale diagram of a random quadrilateral microlens array consisting of a random arrangement of microlenses in different regions, divided by FIGS. 10 a-10 d, in one embodiment;

FIG. 12 is a schematic view showing homogenized light spots of the random quadrangular microlens array composed of the random quadrangular microlens array of FIG. 11, which has an aperture of 60 μm and a curvature of 52mm^-1The cone coefficient is-1.02;

FIG. 13 is a graph of intensity distribution for horizontal and vertical cross-sections of the FIG. 12 homogenization spot.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The gist of the present invention will be further explained with reference to the accompanying drawings and examples.

Example 1:

FIG. 1 is a schematic view showing homogenized light spots of a general microlens array produced by closely arranging microlenses of the same size, wherein the microlenses constituting the general microlens array have an aperture of 60 μm and a curvature of 52mm^-1The cone coefficient is-1.02; FIG. 2 is a graph of intensity distribution for horizontal and vertical cross-sections of the FIG. 1 homogenization spot. It can be seen that, the homogenization light spots of the existing common microlens array have a lot of interference fringes due to the periodic arrangement of the existing common microlens array and the coherence of the laser, and the homogenization light spots are affected by the interference of multiple beams, so that a lot of interference fringes are generated, and the interference fringes affect the homogenization effect of the diffusion sheet on the beams. The intensity of the horizontal and vertical cross sections of the light spot obtained by the conventional microlens array can also be visually seen from FIG. 2The distribution fluctuates greatly, which results in uneven overall spot brightness.

Referring to fig. 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, and the specific scheme is as follows:

an engineered diffuser, comprising: the micro-lens array is formed on the optical substrate and is formed by randomly arranging one or more groups of basic lenses, one group of basic lenses comprises one or more micro-lenses, and the boundary of each micro-lens is random.

In one embodiment, a group of the base lenses is composed of a plurality of microlenses having the same curvature, conic coefficient, and aperture. Referring to fig. 6 and 8, fig. 6 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, conic coefficient and aperture. Fig. 8 is a schematic diagram of a tesson polygonal microlens array consisting of a set of base lenses consisting of a plurality of lenses a having the same curvature, conic index and aperture. The plurality of micro lenses in the group of base lenses are randomly arranged on the surface of the optical substrate, and the random arrangement can make the boundaries of the micro lenses random, thereby being beneficial to breaking the periodicity of the micro lens array and reducing the generation of interference fringes.

In one embodiment, any one of the base lenses of the plurality of base lenses that make up the microlens array has a different curvature and/or conic index and/or caliber than any one of the base lenses of another of the base lenses of the plurality of base lenses that make up the microlens array. As can be understood with reference to fig. 7, fig. 7 is a schematic diagram of a random quadrilateral microlens array consisting of four sets of base lenses: a first group of basic lenses consisting of a plurality of lenses A with the same curvature, conical coefficient and caliber, a second group of basic lenses consisting of a plurality of lenses B with the same curvature, conical coefficient and caliber, a third group of basic lenses consisting of a plurality of lenses C with the same curvature, conical coefficient and caliber, and a fourth group of basic lenses consisting of a plurality of lenses D with the same curvature, conical coefficient and caliber, namely, the lenses A, B, C and D in FIG. 7 have different curvatures and/or conical coefficients; the lens A, the lens B, the lens C and the lens D can be irregularly arranged, the probability of the lens A, the probability of the lens B, the probability of the lens C and the probability of the lens D are basically the same, and the light spots can be more uniform through the multiple groups of different basic lenses.

As can also be understood with reference to fig. 9, fig. 9 is a schematic illustration of a tesson polygonal microlens array consisting of four sets of base lenses in one embodiment, wherein the four sets of base lenses are: the lens comprises a first group of basic lenses consisting of a plurality of lenses A with the same curvature, conical coefficient and caliber, a second group of basic lenses consisting of a plurality of lenses B with the same curvature, conical coefficient and caliber, a third group of basic lenses consisting of a plurality of lenses C with the same curvature, conical coefficient and caliber, and a fourth group of basic lenses consisting of a plurality of lenses D with the same curvature, conical coefficient and caliber. I.e. lens a, lens B, lens C and lens D in fig. 9 have different curvatures and/or conic coefficients from each other. As can be seen from the above, fig. 7 and 9 both select four groups of basic lenses for illustration, and certainly, 3-5 groups and 5-10 groups of basic lenses may also be selected for illustration, which are not described herein again.

In one embodiment, the shape of the microlenses constituting the microlens array may be any polygon, such as a quadrangle, a pentagon, a hexagon, etc., and may also be any shape formed by a tesson polygon. The Thiessen polygon, called Vorono i di atlas, is a set of continuous polygons formed by perpendicular bisectors connecting two adjacent point line segments, and the distances from any point on the edge to the corresponding control point are equal.

The utility model discloses in every group the formation of arranging at random in the different regions of random of every microlens in the basic lens microlens array, the different regions of random of every microlens are as constituteing microlens array's sub-lens. In one embodiment, the randomly different regions of each microlens in one or more groups of the base lenses comprise: upper left region, lower left region, upper right region and lower right region, obtain upper left sub-lens from the upper left region of every microlens, obtain lower left sub-lens from the lower left region of every microlens, obtain upper right sub-lens from the upper right region of every microlens, obtain lower right sub-lens from the lower right region of every microlens, constitute every group of microlens array in the base lens the proportion of upper left sub-lens, lower left sub-lens, upper right sub-lens and lower right sub-lens equals. See FIGS. 10 a-10 d: in fig. 10a, the dotted line frame indicates the upper left region of the microlens, in fig. 10b, the dotted line frame indicates the upper right region of the microlens, in fig. 10c, the dotted line frame indicates the lower left region of the microlens, and in fig. 10d, the dotted line frame indicates the lower right region of the microlens, in which the solid line in fig. 10a to 10d indicates the boundary of a random quadrangle and the dotted line indicates the circumscribed quadrangle of the solid line. Closely-arranged polygons can be formed on the optical substrate, the boundaries of the polygons are random, each polygon is filled with one sub-lens, and the boundary of each sub-lens is the minimum bounding rectangle of the polygon. That is, each microlens in each group of base lenses is divided into 4 regions, and the size of each region is larger than the size of the microlens expected to be arranged to form the microlens array (i.e., the solid line in fig. 10a to 10d ranges from the size of the microlens expected to be arranged to form the microlens array, and the divided regions on the microlenses are circumscribed by the dotted line, and the dashed line boundary is a circumscribed quadrangle of the solid line boundary); dividing each microlens in each group of basic lenses into 4 regions according to the method, and randomly filling any one of the divided upper left sub-lens, lower left sub-lens, upper right sub-lens and lower right sub-lens into a pre-designed random quadrilateral microlens array.

The method for dividing the area described in this embodiment is to separate each part of the lens, then use a batch of separated microlens cells as a module for forming a microlens array group, then randomly select one or more microlens cells in the microlens cells, and then randomly fill and arrange the microlens cells to form a random microlens array. Referring now to FIGS. 11-13, FIG. 11 is a schematic representation of the micropenetration of the various regions demarcated in one embodiment by FIGS. 10 a-10 dFIG. 12 is a gray scale diagram of a random quadrilateral microlens array composed of randomly arranged mirrors, and FIG. 11 is a schematic view of homogenized light spots of the random quadrilateral microlens array composed of microlenses with an aperture of 60 μm and a curvature of 52mm^-1The cone coefficient is-1.02, and fig. 13 is the light intensity distribution curve chart of horizontal and vertical cross section in the homogenization facula schematic diagram of fig. 12, can discover by fig. 11-13, the utility model discloses a homogenization facula of diffusion piece is more even, and interference fringe has obvious reduction compared with fig. 1, and fig. 13 compares with fig. 2, also can discover the utility model discloses a level of the homogenization facula of diffusion piece and the fluctuation range of vertical cross section's light intensity are littleer, explain the light and shade of facula more even, and the optical effect of diffusion piece is better, consequently, synthesizes and gets off comparatively, the utility model provides a diffusion piece improves to some extent than the whole optical effect of current diffusion piece.

In one embodiment, the diffusion sheet of the present invention includes an optical substrate, the optical substrate is a transparent substrate, and the microlens array is formed by randomly etching on a side surface of the optical substrate, and a plurality of microlenses constituting the microlens array are closely arranged on the optical substrate.

In one embodiment, the central points of the microlenses in the microlens array 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 having the largest aperture among the microlenses arranged in one row or one line, and the lower limit value of the predetermined range is 0.

Example 2:

the utility model discloses in every group random different regions of every microlens in the basic lens arrange at random and form the microlens array. In one embodiment, the randomly different regions of each microlens in each set of the base lenses comprise: the micro-lens array comprises an upper left area, a lower left area, an upper right area, a lower right area and a central area, wherein an upper left sub-lens is obtained from the upper left area of each micro-lens, a lower left sub-lens is obtained from the lower left area of each micro-lens, an upper right sub-lens is obtained from the upper right area of each micro-lens, a lower right sub-lens is obtained from the lower right area of each micro-lens, and a central sub-lens is obtained from the central area of each micro-lens. 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 base lenses forming the micro-lens array are equal, and the total number of the central sub-lenses in one or more groups of the base lenses forming the micro-lens array is not more than 50% of the total number of the sub-lenses forming the micro-lens array. The method comprises the steps of dividing a microlens in a group of basic lenses into 5 regions, wherein the size of each region is larger than that of the microlens expected to be arranged to form a microlens array, dividing each microlens in one or more groups of basic lenses into 5 regions according to the method, and randomly filling any one of a left upper sub-lens, a left lower sub-lens, a right upper sub-lens, a right lower sub-lens and a center sub-lens which are obtained through division into a random quadrilateral microlens array which is designed in advance.

The method for dividing the area is also to separate each part of the lens, then use a batch of separated microlens small units as a module for forming a microlens array group, then randomly select one or more microlens small units, and then randomly fill and arrange to form a random microlens array. However, compared to embodiment 1, this embodiment divides one microlens into 5 regions, and the total number of the central sub-lenses in one or more groups of the base lenses constituting the microlens array does not exceed 50% of the total number of sub-lenses constituting the microlens array.

Example 3:

referring to fig. 3-13, the present invention further provides a design method of an engineering diffuser, which comprises the following steps:

A. the boundaries of the individual microlenses arranged to form the microlens array are determined,

B. determining one or more sets of base lenses that make up the microlens array, wherein a set of the base lenses is made up of one or more microlenses,

C. and selecting random different areas of each microlens in the one or more groups of basic lenses and filling the random different areas into the boundary range of each microlens forming the microlens array, wherein the size of the random different areas of each microlens in the one or more groups of basic lenses is larger than that of the boundary of each microlens forming the microlens array.

In one embodiment, a method of determining a boundary at which individual microlenses forming a microlens array are arranged, comprises:

if it is determined that the boundaries of the individual microlenses arranged to form the microlens array are random quadrangles, see fig. 3:

firstly, forming a rectangular grid array pattern with M rows and N columns,

then, randomly expanding the X coordinate value and/or the Y coordinate value of each point in the rectangular grid array graph by 0-0.1 time of the side length of the grid to obtain an updated coordinate point of each point,

and then sequentially connecting the updated coordinate points of the two adjacent points to obtain a random quadrilateral boundary.

In another embodiment, a method of determining a boundary at which individual microlenses forming a microlens array are arranged, includes:

if it is determined that the boundaries of the individual microlenses arranged to form the microlens array are Thiessen polygons, see FIG. 4:

firstly, arranging all the micro lenses forming the micro lens array according to P odd columns and P +1 even columns, wherein each micro lens in each column is randomly selected,

then, the X coordinate value and/or the Y coordinate value of the center point of each microlens in each row is randomly enlarged by 0-0.1 times of the length or width of the microlens to obtain an updated coordinate point of the center point of each microlens,

and connecting any two adjacent updated coordinate points in the updated coordinate points of the central point of each micro lens, manufacturing a vertical bisector of a connecting line of the two adjacent updated coordinate points, and mutually and alternately connecting a plurality of vertical bisectors obtained according to the manufacturing method to obtain the Thiessen polygon boundary.

To sum up, the utility model provides a diffusion piece is through random boundary to and different curvatures and the cone coefficient that is formed by multiunit basic lens have produced different rise and have disturbed periodic arrangement, reduce the interference fringe that influence that many beams after the microlens interfered and brought and produced, promote the homogeneity of facula, wholly promoted the optical effect who spreads the piece.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.

While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications and changes may be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. An engineered diffuser, comprising:

an optical substrate having a plurality of optical elements,

and the micro lens array is formed on the optical substrate and consists of one or more groups of basic lenses which are randomly arranged, one group of basic lenses comprises one or more micro lenses, and the boundary of each micro lens is random.

2. An engineered diffuser sheet of claim 1,

the optical substrate is a transparent substrate, the micro-lens array is randomly formed on the surface of one side of the optical substrate, and a plurality of micro-lenses forming the micro-lens array are closely arranged on the optical substrate;

each group of the basic lenses consists of a plurality of micro lenses with the same curvature, conical coefficient and caliber;

each micro lens in each group of the basic lenses is randomly arranged on the surface of the optical substrate.

3. An engineered diffuser sheet of claim 1,

any one microlens in one group of basic lenses in the multiple groups of basic lenses forming the microlens array and any one microlens in another group of basic lenses in the multiple groups of basic lenses forming the microlens array have different curvatures and/or conic coefficients and/or calibers.

4. An engineered diffuser sheet of claim 1,

and randomly different areas of each micro lens in each group of the basic lenses are randomly arranged to form the micro lens array, and the randomly different areas of each micro lens are used as sub lenses forming the micro lens array.

5. An engineered diffuser sheet of claim 4,

the randomly different regions of each microlens in each set of the base lenses comprise: the micro-lens array comprises an upper left area, a lower left area, an upper right area and a lower right area, wherein an upper left sub-lens is obtained from the upper left area of each micro-lens, a lower left sub-lens is obtained from the lower left area of each micro-lens, an upper right sub-lens is obtained from the upper right area of each micro-lens, a lower right sub-lens is obtained from the lower right area of each micro-lens, 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 basic lenses forming the micro-lens array are equal; or the like, or, alternatively,

the randomly different regions of each microlens in each set of the base lenses comprise: the central sub-lens is obtained from the central area of each micro-lens, each group of the micro-lens array is formed, 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 the basic lens are equal, and one or more groups of the micro-lens array are formed, wherein the total number of the central sub-lenses in the basic lens is not more than 50% of the total number of the sub-lenses forming the micro-lens array.

6. An engineered diffuser sheet of claim 5,

and forming closely arranged polygons on the optical substrate, wherein the boundaries of the polygons are random, each polygon is filled with one sub-lens, and the boundary of each sub-lens is the minimum circumscribed rectangle of the polygon boundary.

7. An engineered diffuser sheet of claim 1,

the central points of the micro lenses arranged in a row or a column are randomly distributed in a preset range on two sides of a straight line;

the upper limit value of the predetermined range is 1/10 of the aperture size value of the microlens having the largest aperture among the microlenses arranged in a row or a line, and the lower limit value of the predetermined range is 0.

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