CN113376719B - Engineering diffusion sheet and random micro-lens array boundary processing method - Google Patents
Engineering diffusion sheet and random micro-lens array boundary processing method Download PDFInfo
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- CN113376719B CN113376719B CN202110448243.1A CN202110448243A CN113376719B CN 113376719 B CN113376719 B CN 113376719B CN 202110448243 A CN202110448243 A CN 202110448243A CN 113376719 B CN113376719 B CN 113376719B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0043—Inhomogeneous or irregular arrays, e.g. varying shape, size, height
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
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Abstract
The invention discloses an engineering diffusion sheet and a random micro-lens array boundary processing method, wherein the diffusion sheet comprises an optical substrate and a micro-lens array formed on the optical substrate, the micro-lens array comprises a plurality of micro-lenses which are arranged, the junctions of two adjacent micro-lenses are in transition connection through adjacent transition curved surfaces, and top curved surface bulges are formed in the cross areas of the adjacent transition curved surfaces. The random micro-lens array boundary processing method comprises the steps of performing convolution processing on an initial design gray level image of a random micro-lens array to obtain an optimized design gray level image; and manufacturing the engineering diffusion sheet based on the optimized design gray level image. The invention can eliminate the height mutation between the lenses on the diffusion sheet, reduce the processing difficulty and improve the light utilization rate.
Description
Technical Field
The invention relates to the technical field of display, in particular to an engineering diffusion sheet and a random micro-lens array boundary processing method.
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 conventional microlens array usually adopts a refractive aspheric lens array, but the light beam thereof may generate interference fringes and uneven light spots after passing through the aspheric lens array, and due to the existence of random quantity, abrupt changes of gray values (abrupt changes of height are shown in the microlens structure) may be generated at the boundary of adjacent microlenses in the microlens design drawing, which theoretically may reduce the light energy utilization rate.
Therefore, it is necessary to provide a new technical solution to solve the problems in the prior art.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and on the one hand, the invention provides an engineering diffusion sheet for solving the problem that the light energy utilization rate is low because the manufactured engineering diffusion sheet with a micro-lens array has high abrupt change in a micro-lens structure in the prior art, and the adopted technical scheme is as follows:
the invention provides a random micro-lens array boundary processing method, which comprises the following steps:
providing an initial design gray scale image of a random microlens array;
performing convolution processing on the initial design gray level image of the random micro-lens array according to the precision of the photoetching equipment to obtain an optimal design gray level image;
manufacturing the random micro-lens array based on the optimized design gray level image;
the convolution processing specifically includes:
selecting a convolution kernel, wherein the convolution kernel is an N x N matrix selected according to the aperture of the microlens, and the matrix element values are all 1/(N x N), wherein N is an odd number which is more than or equal to 3;
and performing convolution processing on the initial design gray level image of the random micro-lens array through the convolution kernel to obtain an optimized design gray level image.
Further, if the optical effect of the random micro-lens array manufactured according to the optimal design gray level image does not reach the target optical effect, the initial design gray level image is subjected to convolution processing again after the size of the convolution kernel is reduced or enlarged until the optical effect of the random micro-lens array manufactured reaches the target optical effect.
Further, if the optical effect of the random micro-lens array manufactured according to the optimized design gray level image is not up to the standard compared with the target optical effect, the convolution times of the initial design gray level image are reduced or increased until the optical effect of the manufactured random micro-lens array is up to the standard.
Further, the maximum value of the convolution kernel size is 1/10 of the maximum microlens size in the random microlens array, and the minimum value of the convolution kernel size is 1/20 of the minimum microlens size in the random microlens array.
The invention also provides an engineered diffuser sheet comprising: the micro-lens array comprises a plurality of arranged micro-lenses, the junction of two adjacent micro-lenses is in transition connection through an adjacent transition curved surface, and a top curved surface bulge is formed in the cross area of the adjacent transition curved surfaces.
Preferably, in the above technical solution, any one of the microlenses is connected with the microlens wound therearound through the adjacent transition curved surface and the top curved surface protrusion.
Preferably, centers of junctions of a plurality of microlenses randomly arranged in an annular adjacent manner are in transition connection through a top curved surface bulge.
Preferably, centers of junctions of a plurality of microlenses randomly arranged adjacently in an annular shape are in transition connection through a top curved surface protrusion, every two microlenses arranged adjacently in an annular shape are connected in a pairwise manner, every two connected junctions are in transition connection through the adjacent transition curved surfaces, every two microlenses are connected in a pairwise manner to form a plurality of adjacent transition curved surfaces, and the top curved surface protrusion is formed at the junctions of the plurality of adjacent transition curved surfaces.
Preferably, a circumscribed circle of the bottom surface of the top curved surface protrusion is an inscribed circle of the intersection region of the plurality of adjacent transition curved surfaces.
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 curvature range of the micro lenses arranged in the array is 70-120 mm-1；
Preferably, the cone coefficients of the microlenses of the arrangements are in the range of 1.0 to-2.0;
preferably, the size range of the micro lenses arranged in a plurality of rows is 20-50 um.
Compared with the prior art, the invention has one or more of the following beneficial effects:
1. the engineering diffusion sheet provided by the invention generates different rise through random boundaries, different curvatures and cone coefficients to disturb the periodic arrangement of the micro lenses, so that interference fringes generated by interference of light beams after passing through the micro lenses are reduced, and the uniformity of light spots is improved.
2. The invention also provides a random microlens array boundary processing method, which is used for eliminating the height mutation among the microlenses, reducing the light leakage and facilitating the manufacture by performing convolution processing on the random microlens array design gray level graph.
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 other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a design gray scale map and a close-up view of a designated location of a random microlens array according to a prior art arrangement;
FIG. 2 is a schematic perspective view of a partial enlarged view of the design gray scale map of the random microlens array shown in FIG. 1;
FIG. 3 is a schematic perspective view of a designed gray scale of the random microlens array after a convolution process is performed on FIG. 2 by the boundary processing method according to the present invention;
fig. 4 is a schematic perspective view of a design gray scale map of the random microlens array obtained by performing convolution 5 times on the design gray scale map of fig. 3.
Wherein: 100-a microlens array; 110-microlenses; 120-adjacent transition surface; 130-top curve raised.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The gist of the present invention will be further explained below with reference to the accompanying drawings and examples.
Example 1:
referring to fig. 1, in order to design a gray scale map and a partial enlarged view of a designated position of a random microlens array according to the prior art, the design gray scale map is randomly filled into a random quadrangle by a single microlens unit, because distances from the quadrangle boundary to the center point of the lens are different, even though parameters such as curvature and caliber of the microlenses on both sides of the boundary are the same, gray scale values on both sides of the boundary cannot be made equal, and because the quadrangle is random, the larger the size difference of the quadrangle on both sides of the boundary is, the larger the gray scale value difference is. If a plurality of microlens units are used for filling, the gray values at two sides of the boundary are different due to different curvatures and cone coefficients, namely, the gray values are suddenly changed, and at this time, the boundary processing method provided by the invention is needed to eliminate the sudden change.
With continued reference to fig. 2, which is a partially enlarged perspective view of the design gray scale map of the random microlens array shown in fig. 1, it can be seen from fig. 2 that there is a significant abrupt change at the boundary between two adjacent microlenses, and this abrupt change affects both the optical performance of the optical field and increases the difficulty of manufacturing.
In order to solve the above problems, the present invention provides an engineered diffuser that overcomes the apparent abrupt change at the boundary between two adjacent microlenses in the existing diffuser, the diffuser comprising: the micro-lens array 100 comprises a plurality of micro-lenses 110 arranged, the junction of two adjacent micro-lenses 110 is in transition connection through an adjacent transition curved surface 120, and a top curved surface bulge 130 is formed in the intersection area of the adjacent transition curved surfaces 120.
In a preferred embodiment, any one of the microlenses 110 is connected to the microlens 110 wound therearound via the adjoining curved transitional surface 120 and the top curved protrusion 130.
In a preferred embodiment, the centers of the intersections of any plurality of microlenses 110 arranged adjacently in a ring shape are transitionally connected by the top curved protrusion 130.
In one embodiment, centers of junctions of any plurality of microlenses arranged adjacently in a ring shape are transitionally connected by a top curved surface protrusion 130, the plurality of microlenses arranged adjacently in a ring shape are connected in pairs, junctions where the pairs of microlenses are transitionally connected by the adjacent transitional curved surfaces 120, the plurality of microlenses are connected in pairs to form a plurality of adjacent transitional curved surfaces 120, and the junctions of the plurality of adjacent transitional curved surfaces 120 form the top curved surface protrusion 130.
Referring to fig. 3, the central junctions of any four microlenses 110 adjacently arranged in a ring shape are transitionally connected by a top curved protrusion 130, the four microlenses 110 adjacently arranged in a ring shape are connected in pairs, the junctions of the two adjacent microlenses are transitionally connected by the adjacent transitional curved surfaces 120, the four microlenses 110 are connected in pairs to form four adjacent transitional curved surfaces 120, and the junctions of the four adjacent transitional curved surfaces 120 form the top curved protrusion 130. Referring to fig. 3, fig. 3 only shows that nine microlenses 110 are arranged in a grid pattern to form three rows and three columns in one embodiment, four microlenses 110 located at one corner of the grid pattern in fig. 3 are arranged next to each other in a ring-shaped manner to form a closed loop (in fig. 3, the four microlenses 110 are arranged in a grid pattern), the four microlenses 110 are connected to each other in a two-by-two manner to form four adjacent transition curved surfaces 120, and the junctions of the four adjacent transition curved surfaces 120 form the top curved surface protrusions 130.
In one embodiment, the circumcircle of the bottom surface of the top curved protrusion 130 is an inscribed circle of the intersection region of the adjacent curved transitions 120, and in one instance, the top curved protrusion 130 may be understood as a protrusion upwardly generated at the intersection region of the adjacent curved transitions 120, which may be a cone in general, or an irregular curved protrusion. With continued reference to fig. 3, the intersection of the four microlenses 110 located at one corner of the cross grid in fig. 3 forms a top curved protrusion 130 (the top curved protrusion may be at the center of the intersection), and the top curved protrusion 130 may be understood as a protrusion that is formed upward from the intersection area of the four adjacent transition curved surfaces 120 formed at the boundary where the four microlenses 110 are connected in pairs, and the circumscribed circle of the bottom surface of the top curved protrusion 130 falls within the intersection area of the four adjacent transition curved surfaces 120, and in a preferred embodiment, the circumscribed circle of the bottom surface of the top curved protrusion 130 is an inscribed circle of the intersection area of the four adjacent transition curved surfaces 120.
In the present invention, the junctions of the plurality of microlenses 110 randomly arranged in an annular adjacent manner are transitionally connected by the top curved protrusion 130, that is, when the plurality of microlenses 110 form a closed loop connection of a minimum unit, the junctions of the plurality of microlenses 110 form the top curved protrusion 130 (the top curved protrusion may be at the center of the junctions), and the plurality of microlenses 110 are transitionally connected by the top curved protrusion 130. For example, if a plurality of circular microlenses 110 having the same boundary dimension are aligned, four circular microlenses 110 form a closed-loop connection of a minimum unit, or a plurality of polygonal microlenses 110 having the same boundary dimension are arranged in a staggered manner. Basically, three microlenses 110 with any shape can form a closed-loop connection with a minimum unit, for example, if a plurality of microlenses 110 with regular hexagonal shapes are closely arranged in a honeycomb shape, three microlenses 110 with regular hexagonal shapes can form a closed-loop connection with a minimum unit. In summary, if the microlenses 110 are all located at 360 degrees of the periphery of a point, the point will form the top curved protrusion 130, and this design is also designed to eliminate abrupt changes between adjacent microlenses 110.
In one embodiment, the center points of the microlenses 110 arranged in a row or a column are randomly distributed within a predetermined range on both sides of a straight line. In one case, it is contemplated that the center points of any of the microlenses 110 can be randomly distributed. Of course, the upper limit value of the predetermined range on both sides of the straight line is 1/10 of the size value of the aperture of the microlens, the lower limit value of the predetermined range is 0, and in one case, the upper limit value of the predetermined range is 1/10 of the size value of the aperture of the largest microlens among the plurality of microlenses arranged in a row or a line.
In one embodiment, the curvature of the arranged microlenses 110 forming the diffusion sheet is in a range of 70-120 mm-1。
In one embodiment, the conic coefficients of the rows of microlenses 110 forming the diffuser are in the range of 1.0 to-2.0.
In one embodiment, the size of the arranged microlenses 110 forming the diffusion sheet is in the range of 20-50 um.
The engineering diffusion sheet comprises a plurality of arranged microlenses 110, the junctions of two adjacent microlenses 110 are in transition connection through adjacent transition curved surfaces 120, and the intersection areas of the adjacent transition curved surfaces 120 form top curved surface bulges 130, so that no height mutation exists between every two adjacent microlenses, the light leakage is reduced, and the manufacturing is convenient.
Different rise heights are generated through random boundaries, different curvatures and different cone coefficients to disturb the periodic arrangement of the micro-lens 110, interference fringes generated by interference of light beams after passing through the micro-lens 110 are reduced, and the uniformity of light spots is improved.
Example 2:
in another aspect, the present invention further provides a method for processing a boundary of a random microlens array, which can reduce a sudden height change between two adjacent microlenses, reduce the processing difficulty of a diffusion sheet, and improve the optical effect of the prepared diffusion sheet, the method including:
providing an initial design gray scale image of a random microlens array;
performing convolution processing on the initial design gray level image of the random micro-lens array to obtain an optimal design gray level image;
and manufacturing the random micro-lens array based on the optimal design gray level image to obtain an engineering diffusion sheet.
In the above method, the convolution processing is performed on the initial design gray scale image of the random microlens array according to the precision of the lithography apparatus, and the convolution processing can be implemented by the following method:
firstly, selecting a convolution kernel, wherein the convolution kernel is an N x N matrix selected according to the aperture of a microlens, and the matrix element values are all 1/(N x N), wherein N is an odd number which is more than or equal to 3;
and then, carrying out convolution processing on the initial design gray level image of the random micro lens array through the convolution kernel to obtain an optimized design gray level image.
And comparing the optical effect of the random microlens array manufactured according to the optimally designed gray level image with a target optical effect, and if the optical effect of the random microlens array manufactured according to the optimally designed gray level image does not reach the standard compared with the target optical effect, in one embodiment, the initial designed gray level image is subjected to convolution processing again after the size of the convolution kernel is reduced or enlarged until the optical effect of the manufactured random microlens array reaches the standard.
In another embodiment, if the optical effect of the random microlens array manufactured according to the optimally designed grayscale image does not reach the standard compared with the target optical effect, the number of convolution times can be reduced or increased for the initially designed grayscale image until the optical effect of the manufactured random microlens array reaches the standard.
In one embodiment, the maximum value of the size of the convolution kernel used for the convolution process is 1/10 of the maximum microlens size in the random microlens array, and the minimum value of the convolution kernel size is 1/20 of the minimum microlens size in the random microlens array.
In one embodiment, the above-mentioned reduction or enlargement of the size of the convolution kernel is followed by the re-convolution of the initial design gray scale image, and then the reduction or enlargement of the size of the convolution kernel may be an enlargement or reduction of the number of rows and columns of the convolution kernel, or an enlargement or reduction of the size of matrix element values within the convolution kernel.
The initial design gray level image of the random micro lens array is convoluted by the convolution core, the rule of convolution operation used in the convolution processing is communicated with the rule of convolution operation in the mathematical field, and the image processing of the initial design gray level image of the random micro lens array is realized by mathematical convolution so as to reduce height mutation between adjacent micro lenses, reduce the manufacturing difficulty of the engineering diffusion sheet and improve the optical effect of the engineering diffusion sheet.
In one case, the initial design gray image is convolved when the random microlens array is subjected to boundary processing, and if the optical index effect is not achieved, the size of the convolution kernel is changed, and then an attempt is made again to change the size of the convolution kernel by reducing or enlarging the number of rows and columns of the convolution kernel, or to change the size of the convolution kernel by enlarging or reducing the size of matrix element values in the convolution kernel.
Under another condition, when the random micro-lens array is subjected to boundary processing, the initially designed gray level image is convoluted, abrupt change still obviously cannot be processed easily, and one or more convolutions can be performed again to ensure that the resolution precision of manufacturing equipment can be met by the abrupt change on the premise of reaching optical indexes.
In the random microlens array boundary processing method according to the present invention, a reference example of providing an initial design gray scale image of a random microlens array can be seen in fig. 2, and fig. 2 can be understood as an initial design gray scale image of a random microlens array provided, which is not processed, but only a preliminary arrangement of microlenses.
With continuing reference to fig. 3, fig. 3 is a schematic perspective view of a designed gray scale map of the random microlens array after the boundary processing method of the present invention is used to perform a convolution process on fig. 2, and it can be seen from fig. 3 that abrupt changes at the boundary are significantly slowed down. The convolution operation can modify the gray value of each pixel in the image into the average value of the gray values of 5x5 pixels centered on the pixel, wherein the size of a convolution kernel selected by the convolution processing is a two-dimensional matrix of 5x5, and the matrix element values are all 1/25. The size of the convolution kernel can be adjusted correspondingly according to the aperture of the micro lens, the convolution kernel is an NxN matrix, the size of the convolution kernel is about 1/10-1/20 of the size of a certain micro lens in the random micro lens array, and the element values of the convolution kernel are all 1/(NxN), wherein N is an odd number which is more than or equal to 3 generally. Although the convolution processing can slightly change parameters such as the curvature and cone coefficient of the micro-lenses and can cause the optical performance index of the manufactured random micro-lens array engineering diffusion sheet to change (both rising and falling are possible), the convolution processing mode can reduce abrupt change and reduce the processing difficulty of the diffusion sheet, so that the size of the convolution kernel is adjusted according to the actual optical performance.
If the diffusion sheet manufactured according to fig. 3 does not reach the optical index, the number of convolutions can be increased or decreased accordingly, if five convolutions are performed on the design gray scale map of fig. 3, fig. 4 is obtained, and it can be seen from fig. 4 that the transition at the boundary is more gradual, i.e., the abrupt change is reduced. However, as can be seen from the z-axis coordinate range, the maximum gray value is reduced from 255 to 200, which means that the curvature and cone coefficient of the microlens have become significantly slow, so the convolution frequency in the convolution processing is not too large, but if the abrupt change still exists after 1 time of convolution, the convolution frequency should be increased or decreased appropriately according to the measured optical performance to achieve the optical index of the engineered diffuser.
The random micro-lens array boundary processing method provided by the invention can be used for carrying out convolution processing on the random micro-lens array design gray level graph, so that the height mutation among micro-lenses is eliminated, the processing difficulty is reduced, and the light utilization rate is improved.
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 not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A random microlens array boundary processing method is characterized by comprising the following steps:
providing an initial design gray scale image of a random microlens array;
performing convolution processing on the initial design gray level image of the random micro-lens array according to the precision of the photoetching equipment to obtain an optimal design gray level image;
manufacturing the random micro-lens array based on the optimized design gray level image;
the convolution processing specifically includes:
selecting a convolution kernel, wherein the convolution kernel is an N x N matrix selected according to the aperture of the microlens, and the matrix element values are all 1/(N x N), wherein N is an odd number which is more than or equal to 3;
and performing convolution processing on the initial design gray level image of the random micro-lens array through the convolution kernel to obtain an optimized design gray level image.
2. The method of claim 1, wherein if the optical effect of the random microlens array fabricated according to the optimally designed grayscale image is not up to standard compared with the target optical effect, the initial designed grayscale image is convolved again after the size of the convolution kernel is reduced or enlarged until the optical effect of the random microlens array fabricated is up to standard; or
And if the optical effect of the random micro-lens array manufactured according to the optimized design gray level image does not reach the standard compared with the target optical effect, reducing or increasing the convolution times of the initial design gray level image until the optical effect of the manufactured random micro-lens array reaches the standard.
3. The method as claimed in claim 1, wherein the maximum value of the convolution kernel size is 1/10 of the largest microlens size in the random microlens array, and the minimum value of the convolution kernel size is 1/20 of the smallest microlens size in the random microlens array.
4. An engineered diffuser prepared by the random microlens array boundary processing method of any one of claims 1 to 3, comprising:
an optical substrate having a plurality of optical elements,
a micro lens array formed on the optical substrate, wherein the micro lens array comprises a plurality of micro lenses arranged, the junction of two adjacent micro lenses is in transition connection through an adjacent transition curved surface,
the intersection region of a plurality of the adjacent transition curved surfaces forms a top curved surface bulge.
5. An engineered diffuser sheet of claim 4,
any one of the micro lenses is connected with the micro lens wound around the micro lens through the adjacent transition curved surface and the top curved surface bulge.
6. An engineered diffuser sheet of claim 5,
the centers of the junctions of a plurality of microlenses which are randomly and adjacently arranged in an annular shape are in transition connection through the top curved surface bulge.
7. An engineered diffuser sheet of claim 6,
the centers of the junctions of a plurality of microlenses randomly arranged in an annular adjacent manner are in transition connection through a top curved surface bulge, the microlenses arranged in an annular adjacent manner are connected in pairs, and the junctions of the two pairs of junctions are in transition connection through the adjacent transition curved surfaces,
the plurality of microlenses are connected pairwise to form a plurality of adjacent transition curved surfaces, and the top curved surface bulges are formed at the junctions of the plurality of adjacent transition curved surfaces.
8. An engineered diffuser sheet of claim 4,
and the circumcircle of the bottom surface of the top curved surface bulge is an inscribed circle of the intersection area of the adjacent transition curved surfaces.
9. An engineered diffuser sheet of claim 4,
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.
10. An engineered diffuser sheet according to claim 4,
the curvature range of the micro lenses arranged in the array is 70-120 mm-1；
The cone coefficients of the arranged microlenses range from 1.0 to-2.0;
the size range of the micro lenses arranged in the array is 20-50 um.
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| US6301051B1 (en) * | 2000-04-05 | 2001-10-09 | Rockwell Technologies, Llc | High fill-factor microlens array and fabrication method |
| JP4981300B2 (en) * | 2005-10-13 | 2012-07-18 | キヤノン株式会社 | Focus plate and optical viewfinder having the same |
| JP2008299158A (en) * | 2007-06-01 | 2008-12-11 | Nikon Corp | Method for manufacturing microlens array |
| JP6753660B2 (en) * | 2015-10-02 | 2020-09-09 | デクセリアルズ株式会社 | Diffusing plate, display device, projection device and lighting device |
| CN108426585B (en) * | 2018-03-12 | 2019-09-13 | 哈尔滨工业大学 | A kind of geometric calibration method of light-field camera |
| CN211506054U (en) * | 2020-01-15 | 2020-09-15 | 宁波舜宇奥来技术有限公司 | Light homogenizing structure for optical lens |
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