CN113900168A - Diffusion plate and forming method thereof - Google Patents

Diffusion plate and forming method thereof Download PDF

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Publication number
CN113900168A
CN113900168A CN202010646389.2A CN202010646389A CN113900168A CN 113900168 A CN113900168 A CN 113900168A CN 202010646389 A CN202010646389 A CN 202010646389A CN 113900168 A CN113900168 A CN 113900168A
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microlens
units
diffuser plate
microlens array
micro
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吴尚亮
陈俊逸
谢前森
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Ningbo Sunny Automotive Optech Co Ltd
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Ningbo Sunny Automotive Optech Co Ltd
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The application provides a diffusion plate and a forming method thereof. The diffuser plate includes a base and one or more microlens array units disposed on the base and including a plurality of microlens units, wherein any edge of any one of the microlens array units is flat. The diffusion plate according to the application can realize excellent speckle dissipation effect, and is particularly suitable for the design and processing of the diffusion plate with larger breadth.

Description

Diffusion plate and forming method thereof
Technical Field
The present disclosure relates to the field of optical elements, and more particularly, to a diffuser plate and a method for forming the same.
Background
Devices such as Head Up Display (HUD), lidar, and assisted steering systems are increasingly used, and these devices generally require the use of a diffuser plate. The conventional diffuser plate may be a ground glass type diffuser plate, and the microlens array type diffuser plate is a new development direction. In the design and manufacturing process of the micro-lens array type diffusion plate, the form of the micro-lens has good controllability compared with ground glass, and the effects of the design such as diffusion angle size, light field uniformity, definition and the like can be realized more accurately.
With the development of the HUD market, users have made higher and higher demands on the resolution and definition of HUD products, and thus, the demands on the supporting image production modules are also higher and higher. For example, the resolution and sharpness of the image generation unit (PGU) are increasing. High resolution PGU solutions, such as represented by Micro-Electro-Mechanical systems (MEMS) types, are becoming more sophisticated and are becoming more and more widely used. The conventional microstructure type diffusion plate is composed of a series of same microstructure arrays and can generate a speckle effect when being applied to an MEMS-PGU, so that a projected picture generates obvious granular sensation and the uniformity of the picture is reduced.
Therefore, a diffuser plate that can greatly reduce the speckle effect and improve the projection quality is desired.
Disclosure of Invention
Embodiments of the present application provide a diffuser plate that may include a base and one or more microlens array units that may be disposed on the base and include a plurality of microlens units, wherein any edge of any one of the microlens array units may be flat.
In one embodiment, any edge of any one of the microlens array units includes one or more straight edges.
In one embodiment, the straight edges of adjacent edges of any two adjacent microlens array units can be spliced without gaps between the straight edges.
In one embodiment, one or more microlens array units may have at least one shape of a regular polygon, a rectangle, a parallelogram, a regular triangle, an isosceles triangle, a right triangle, or the like.
In one embodiment, each microlens array unit may include at least two different shaped microlens units.
In one embodiment, each microlens unit may have a uniform transition therebetween, and the curved surfaces of any two adjacent microlens units may be connected to each other.
In one embodiment, the bottom of each of the microlens units may be a polygon having four or more sides.
In one embodiment, the diffuser plate may include a plurality of microlens array units that may be sequentially tiled along the lateral and longitudinal directions by respective flat edges on a substrate to form the diffuser plate.
In one embodiment, the plurality of microlens array units may include a plurality of basic microlens unit groups, wherein a microlens unit in each basic microlens unit group may be in a mirror image relationship with an arrangement order of microlens units in its neighboring microlens unit group.
In one embodiment, the plurality of microlens array units may have identical structures to each other.
In one embodiment, the plurality of microlens array units may have different structures from each other.
In one embodiment, the distance from the bottom of each of the plurality of microlens units to the substrate may be a random value within a preset range. The random value is obtained within a preset range based on the Rand function.
In one embodiment, at least a portion of each side of each microlens unit in the diffuser plate may be non-parallel to each other.
Embodiments of the present application also provide a method for forming a diffuser plate, which may include: forming a plurality of microlens array units, wherein any edge of each microlens unit may be flat; and transversely and longitudinally splicing the plurality of micro-lens array units on the substrate through the flat edges to form the diffusion plate.
In one embodiment, the transverse stitching may comprise: arranging the micro-lens array units from left to right, and repeatedly spreading the micro-lens array units from the rightmost side to the leftmost side in sequence to the right; and the longitudinal splicing may include: the microlens array units are arranged from top to bottom, and are repeatedly spread right in sequence from the lowermost side to the uppermost side.
Embodiments of the present application also provide a method for forming a diffuser plate, which may include: setting an initial microlens array comprising a plurality of microlens units on a substrate, wherein the bottoms of the microlens units can be polygons with the number of sides being more than or equal to four;
controlled by an algorithm so that:
the distance between the centers of two arbitrary adjacent microlens units in the initial microlens array in a first direction and a second direction respectively floats up and down by a first threshold value and a second threshold value, wherein the first direction is vertical to the second direction;
the initial cone coefficients of the micro-lens unit in the first direction and the second direction float up and down by a third threshold value and a fourth threshold value respectively; and
the initial curvature radiuses of the micro lens units in the first direction and the second direction respectively float up and down by a fifth threshold value and a sixth threshold value; and
the bottom of each microlens cell is added with a random height within a preset range based on a Rand random function.
In one embodiment, each microlens unit may have a uniform transition therebetween, and the curved surfaces of any two adjacent microlens units may be connected to each other.
The diffuser plate provided by the present application can have at least one of the following beneficial effects: (1) the bottom of the micro lens unit is a plurality of disordered polygons with the number of sides more than or equal to four, and the structure can greatly improve the effect of eliminating speckles; (2) the diffusion plate consists of one or more microlens array units with flat and splittable random edges, when the large-size diffusion plate is processed and manufactured, the splitting processing can be carried out, the problem of incomplete splitting is not generated during splitting, the splitting difficulty is greatly reduced, and the possibility of reducing the uniformity of a diffused light field is reduced; (3) the effect of eliminating speckles of the diffusion plate can be improved by reducing the repeatability in the splicing process of the plurality of micro-lens array units.
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Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic perspective view of a diffuser plate according to an embodiment of the present application;
FIG. 2 shows a grayscale map for diffuser plate processing according to an embodiment of the present application;
fig. 3 illustrates an initial structural view of a diffusion plate according to an embodiment of the present application;
FIGS. 4 and 5 illustrate speckle effect graphs of an initial microlens array according to embodiments of the present application;
FIGS. 6 and 7 show speckle effect plots for a random microlens array according to embodiments of the present application;
FIG. 8 illustrates a gray-scale map stitching approach for large format processing according to an embodiment of the present application; and
FIG. 9 shows a graph of the speckle reduction effect of a spliced diffuser plate according to embodiments of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first light diffuser plate discussed below may also be referred to as the second light diffuser plate without departing from the teachings of the present application. And vice versa.
In the present specification, when a particular component (or region, layer, portion, etc.) is referred to as being "on," "connected to," or "coupled to" another component(s), the particular component may be directly disposed on, connected or coupled to the other component(s), or at least one intermediate component may be present therebetween.
In the drawings, the thickness, size and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for convenience of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, in actual practice, the light diffusing system shown in the drawings may be inverted and elements described as "above" other elements or features would then be oriented "below" the other elements or features. Thus, the exemplary term "below" can include both an orientation of above and below.
Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the methods described herein are not necessarily limited to the order described, but can be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic perspective view of a diffuser plate according to an embodiment of the present application. Fig. 2 is a grayscale diagram for diffuser plate processing according to an embodiment of the present application.
Referring to fig. 1 and 2, a diffusion plate 10 according to an embodiment of the present application includes a base 101 and one or more microlens array units 102, which may be disposed on the base 101. Each microlens array unit 102 may include a plurality of microlens units 103. As can be seen from fig. 1 and 2, the diffuser plate surface according to the embodiment of the present application includes various irregular polygons (i.e., microlens elements 103). These microlens units 103 form an array. For example, the plurality of microlens units 103 may be arranged in an m × n matrix form, where m and n are each an integer greater than 1, but the embodiments of the application are not limited thereto.
The material of the substrate 101 may be any suitable transparent or translucent material. The substrate to which the diffuser plate is attached is not limited thereto. The substrate 101 is generally planar, and the plurality of microlens units 103 are arranged in an array in the extending direction of the substrate 101. The substrate 101 is parallel to a plane defined by a first direction (X direction) and a second direction (Y direction), and the longitudinal axis direction of the microlens unit 103 is parallel to a third direction (Z direction). The first direction, the second direction and the third direction are substantially perpendicular to each other.
It is to be understood that the diffusion plate 10 according to the embodiment of the present application may include one or more microlens array units 102. In the case where a plurality of microlens array units 102 are included, the respective microlens array units 102 may have the same structure or different structures, and no particular limitation is made herein. In addition, the microlens array unit 102 may have any suitable number of microlens units 103, and different microlens arrays 102 may have the same or different number of microlens units 103, and the number of microlens units is not particularly limited herein. For the sake of convenience of explanation, only a part of the microlens array used in actual use is shown in the drawings and described as an example.
In this embodiment, any edge of any one of the microlens array units 102 may be flat, enabling stitching with an edge of another microlens array unit. In other words, any edge of any one of the microlens array units 102 may include one or more straight sides. The straight edges of adjacent edges of any two adjacent microlens array elements 102 can be spliced without gaps between them. Specifically, the microlens array unit 102 may have at least one of regular shapes such as a regular polygon, a rectangle, a parallelogram, a regular triangle, an isosceles triangle, a right triangle, and the like, to facilitate forming a tile having flat, stitchable edges. Because the diffuser plate comprises the microlens array unit that one or more arbitrary edges are leveled and can be spliced, consequently when processing and manufacturing big breadth diffuser plate, can carry out the concatenation formula processing, and can not produce the incomplete problem of concatenation during the concatenation, greatly reduced the concatenation degree of difficulty to the homogeneity that has reduced the diffusion light field reduces the possibility.
Each of the microlens array units 102 may include at least two different shapes (i.e., face shapes) of microlens units 103. The microlens units 103 of different shapes may contribute to the diffusion effect of light.
Each microlens unit 103 has a central axis perpendicular to the substrate 101, i.e., the central axis is parallel to the normal direction Z of the substrate 101.
The profile z of any one of the microlens cells 103 can be defined using, but not limited to, the following profile formula (1):
Figure BDA0002573279640000071
here, the central axis of the microlens unit 103 is set as the origin, rxDenotes the distance, r, from the central axis in the first direction xyDenotes the distance, C, from the central axis in the second direction yxDenotes a curvature coefficient, C, of the microlens unit 103 in the first direction xyDenotes a curvature coefficient, k, of the microlens unit 103 in the second direction yxRepresenting the conic coefficient of the microlens unit 103 in the first direction x, and kyRepresenting the conic coefficient of the microlens unit 103 in the second direction y.
Illustratively, the microlens units 103 may have uniform transitions therebetween, and the curved surfaces of any two adjacent microlens units 103 may be connected to each other.
Illustratively, the bottom of each of the microlens units 103 may be a polygon having four or more sides. As shown in fig. 2, the diffusion plate 10 may be composed of polygonal microlens units 103 with a random number of sides equal to or greater than four. The bottom of the micro lens unit 103 is set to be various disordered polygons with the number of sides being more than or equal to 4, so that the speckle eliminating effect of the diffusion plate can be greatly improved.
In an exemplary embodiment, the diffusion plate 10 may include a plurality of microlens array units 102, and the plurality of microlens array units 102 may be sequentially spliced along a lateral direction (i.e., the first direction x) and a longitudinal direction (i.e., the second direction y) on the substrate 101 through respective flat edges to form the diffusion plate 10.
In an exemplary embodiment, the plurality of microlens array units 102 may include a plurality of basic microlens unit groups, wherein the microlens unit 103 in each basic microlens unit group may be in a mirror image relationship with the arrangement order of the microlens units 103 in its neighboring microlens unit group.
In an exemplary embodiment, the distance of the bottom of each of the plurality of microlens units 103 from the substrate 101 may be a random value within a preset range. The random value may be obtained within a preset range based on a Rand function. The random value can be randomly generated by using a Rand function by means of software such as Matlab and the like.
In an exemplary embodiment, the desired random value is randomized using a Rand function in a predetermined range of approximately 0 μm to 5 μm. The plurality of microlens elements of the array require a plurality of random values, so that the plurality of random values can be randomly generated within a preset range by using a Rand function. In the plurality of microlens units of the array, the distance between the bottom of each microlens unit and the substrate is randomly arranged, and the effect of dispersing the spots can be effectively achieved. It should be understood that the above set parameters are merely illustrative and not limiting, and that the preset range height may be greater than 5 μm for a particular application.
In an exemplary embodiment, each microlens unit 103 in the diffusion plate 10 is randomly distributed, and at least a portion of sides of the microlens unit 103 in the entire diffusion plate 10 may not be parallel to each other. In other words, the sides of each microlens unit 103 may be a combination of parallel and non-parallel to each other, some of the sides may be parallel to each other, and some of the sides are not parallel, and the present application is not particularly limited.
The microlens array unit 102 with smooth and spliceable edges can be formed by using the initial microlens array unit with the bottom being a polygon with the number of edges being more than or equal to four, through the control of a specific algorithm and by using the heights between the randomly added microlens units and the substrate. By the stitching of one or more edge-flattened stitchable microlens array elements 102, a diffuser plate 10 with speckle reduction may be formed. The overall diffused light field formed by the diffusion plate 10 has a weak speckle effect, and the performance of the diffused light field is kept good, so that an excellent speckle dissipation effect is realized.
The diffuser plate according to the application and its speckle effect are described below with reference to fig. 3 to 9.
Fig. 3 shows an initial structural view of a diffusion plate according to an embodiment of the present application.
In an exemplary embodiment, an initial microlens array unit 100 'of a diffusion plate is as shown in fig. 3, the initial microlens array unit 100' being a regular quadrilateral microlens array structure, but it should be understood that this is only an example, and embodiments of the present application are not limited thereto. Here, the pitch between any two microlens cells 103 'in the initial microlens array cell 100', i.e., the distance between the centers of two any adjacent microlens cells 103 in the first direction x and the second direction y, is Px and Py, respectively, the initial conic coefficients of the microlens cells 103 in the first direction x and the second direction y are Kx and Ky, respectively, and the initial radii of curvature of the microlens cells 103 in the first direction x and the second direction y are Rx and Ry, respectively. In this embodiment, the pitch Px is 40um, the initial conic coefficient Kx is-0.79, and Ky is-0.79; the initial radius of curvature Rx is 0.0308 and Ry is 0.0556. It is to be understood that the above respective setting parameters are merely illustrative and not restrictive.
The diffuser plate 10 as shown in fig. 1 and 2 can be realized by floating the pitches Px and Py up and down by the first threshold value and the second threshold value, the initial conic coefficients Kx and Ky up and down by the third threshold value and the fourth threshold value, and the initial curvature radii Rx and Ry up and down by the fifth threshold value and the sixth threshold value, respectively, by using the algorithm control, while adding random heights within a preset range at the bottom of each microlens cell 103' by using the Rand function. In this embodiment, specifically, the pitches Px and Py are floated by 10% up and down (i.e., the first threshold is the same as the second threshold), the initial conic coefficients Kx and Ky are floated by 6.33% up and down (i.e., the third threshold is the same as the fourth threshold), and the initial radii of curvature Rx and Ry are floated by 19.48% up and 36% up and down, respectively (i.e., the fifth threshold is not the same as the sixth threshold). It is to be understood that the above respective setting parameters are merely illustrative and not restrictive. It should also be understood that the floating thresholds in the first direction x and the second direction y may be the same or different, and the application is not particularly limited.
Illustratively, adding random heights within a preset range to the bottom of each microlens element 103' can be achieved by software such as Matlab using a Rand function, the random heights within the preset range being about 0 μm to 5 μm or more. The distance between the bottom of the micro lens unit and the substrate is randomly arranged, and the effect of dispersing the spots can be effectively achieved.
Fig. 4 and 5 show speckle effect maps of an initial microlens array 100' according to an embodiment of the present application. Fig. 6 and 7 show speckle effect diagrams of the random microlens array diffusion plate 10 according to an embodiment of the present application.
Fig. 4 and 5 are speckle effect diagrams of the initial microlens array 100' calculated by using the diffraction angular spectrum propagation theory. Fig. 6 and 7 are speckle effect graphs of the random microlens array diffuser plate 10 (i.e., the diffuser plate of the present application) calculated by using the angular spectrum propagation theory of diffraction. By comparison, the speckle effect of the diffused light field in fig. 6 is significantly reduced compared to that in fig. 4. The intensity of the diffused light field in fig. 7 is significantly more uniform than in fig. 5. Therefore, the diffuser plate 10 provided by the present application can greatly reduce the speckle effect, and the uniformity of the diffused light field is better.
In addition, in the actual processing process, if the breadth of the diffusion plate is large, processing is generally required to be performed by means of gray-scale map splicing. Under the condition, the conventional random micro-lens array units cannot be spliced due to uneven edges, so that the periphery of the gray scale image used for splicing is usually incomplete, the splicing difficulty of the micro-lens array units is greatly increased during splicing, and meanwhile, the change of a diffused light field is caused by the splicing error, so that the uniformity of the diffused light field is reduced or the speckle eliminating effect is reduced.
Fig. 8 illustrates a gray-scale map stitching approach that allows large-format processing according to an embodiment of the present application. FIG. 9 shows a graph of the speckle reduction effect of a spliced diffuser plate according to embodiments of the present application.
According to the diffusion plate 10 provided by the application, the edges around the gray-scale image used for splicing are orderly, complete and spliced micro-lens arrays through special algorithm control, so that the processing difficulty cannot be increased due to splicing during processing.
As shown in fig. 8, an exemplary stitching method is shown: first, a plurality of microlens array units shown in fig. 2 are provided, and the plurality of microlens array units are sequentially tiled on the substrate 101 along the lateral direction (i.e., the first direction x) and the longitudinal direction (i.e., the second direction y) by respective flat edges, thereby forming the diffusion plate 10. Specifically, the plurality of microlens array units are arranged from left to right and then repeatedly expanded from the rightmost side to the leftmost side in sequence for transverse tiling, for example, different microlens array units arranged from left to right may be represented by numeral 1234, and microlens array units repeatedly expanded from the rightmost side to the leftmost side in sequence to the right may be represented by numeral 12344321; the method of tiling microlens array elements laterally is then used for vertical spreading. Since the peripheral edge of the microlens array unit is a complete lens, there is no problem of stitching in the above manner.
The diffusion plate 10 after being spliced based on the grayscale map of the present application may include a plurality of basic microlens unit groups, such as a basic microlens unit group 1234, a basic microlens unit group 4321, and the like, wherein the microlens unit 103 in each basic microlens unit group may be in a mirror image relationship with the arrangement order of the microlens units 103 in its neighboring microlens unit group.
The speckle eliminating effect of the diffuser plate spliced based on the gray scale image is shown in fig. 9, and the speckle effect of the spliced diffuser plate can be greatly inhibited as shown in fig. 9. The diffusion plate is formed by one or more microlens array units with smooth and splittable edges, so that the split joint type processing can be carried out when a large-width diffusion plate is processed, the problem of incomplete split joint cannot be caused during split joint, and the possibility of reduction of the uniformity of a diffused light field is reduced. By controlling the repetition degree of the plurality of micro-lens array units in the splicing process, the speckle eliminating effect can be well controlled, and the lower the repetition degree is, the better the speckle eliminating effect is.
To sum up, this application has realized excellent dissipation spot effect under the prerequisite that reduces the processing degree of difficulty by a wide margin, and the design and the processing of the diffuser plate that specially adapted breadth is relatively big.
In addition, embodiments of the present application also provide a method for forming the diffusion plate 10, which may include: forming a plurality of microlens array units 102, wherein any edge of each microlens unit 102 may be flat; and transversely and longitudinally stitching the plurality of microlens array units 102 on the substrate through a flat edge, thereby forming a diffusion plate.
In an exemplary embodiment, the transverse stitching may include: the microlens array units 102 are arranged from left to right and then repeatedly expanded to the right in sequence from the rightmost side to the leftmost side; and the longitudinal splicing may include: the microlens array unit 102 is arranged from top to bottom, and is repeatedly developed and arranged to the right in order from the lowermost side to the uppermost side.
Embodiments of the present application also provide another method for forming a diffusion plate 10, which may include:
an initial micro-lens array 100 ' comprising a plurality of micro-lens units 103 ' is arranged on a substrate, and the bottom of each micro-lens unit 100 ' is a polygon with the number of sides being more than or equal to four;
controlled by an algorithm so that:
the distance between the centers of two arbitrary adjacent microlens units 103 'in the initial microlens array 100' in the first direction x and the second direction y is respectively up and down floated by a first threshold value and a second threshold value, wherein the first direction x is perpendicular to the second direction y;
the initial conic coefficients of the microlens unit 103' in the first direction x and the second direction y float up and down by a third threshold value and a fourth threshold value respectively; and
the initial curvature radii of the microlens unit 103' in the first direction x and the second direction y float up and down by a fifth threshold value and a sixth threshold value, respectively; and
the bottom of each microlens unit 103' is added with a random height within a preset range based on a Rand random function.
In an exemplary embodiment, each microlens unit 103 in the diffusion plate 10 formed according to the above method may have a uniform transition therebetween, and curved surfaces of any two adjacent microlens units 103 are connected to each other.
The above description is only an embodiment of the present application and an illustration of the technical principles applied. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea described above. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. A diffuser plate, comprising:
a substrate; and
one or more microlens array units disposed on the substrate and including a plurality of microlens units, wherein any one edge of any one of the microlens array units is flat.
2. The diffuser plate of claim 1, wherein any edge of any one of the microlens array units includes one or more straight edges.
3. The diffuser plate according to claim 1, wherein the microlens array unit has at least one shape of a regular polygon, a rectangle, a parallelogram, a regular triangle, an isosceles triangle, a right triangle.
4. The diffuser plate of claim 1 wherein each of the microlens array units comprises at least two different shaped microlens units.
5. The diffuser plate according to claim 1, wherein a bottom of each of the microlens units is a polygon having four or more sides.
6. The diffuser plate of claim 1, wherein the diffuser plate comprises a plurality of the microlens array units that are sequentially tiled on the substrate along the lateral and longitudinal directions with respective flattened edges to form the diffuser plate.
7. The diffuser plate according to any one of claims 1 to 6,
the distance from the bottom of each of the plurality of microlens units to the substrate is a random value within a preset range.
8. A method for forming a diffuser plate, comprising:
forming a plurality of microlens array units, wherein either edge of each of the microlens units is flat; and
and transversely and longitudinally splicing the plurality of micro-lens array units on the substrate through the flat edge to form the diffusion plate.
9. The method of claim 8, wherein the transverse stitching comprises:
arranging the micro-lens array units from left to right, and repeatedly spreading the micro-lens array units from the rightmost side to the leftmost side in sequence to the right; and
the longitudinal splicing comprises: the microlens array units are arranged from top to bottom, and are repeatedly spread right in sequence from the lowermost side to the uppermost side.
10. A method for forming a diffuser plate, comprising:
setting an initial micro-lens array comprising a plurality of micro-lens units on a substrate, wherein the bottom of each micro-lens unit is a polygon with the number of sides being more than or equal to four;
controlled by an algorithm so that:
the distance between the centers of two arbitrary adjacent microlens units in the initial microlens array in a first direction and a second direction respectively floats up and down by a first threshold value and a second threshold value, wherein the first direction is perpendicular to the second direction;
the initial cone coefficients of the micro lens units in the first direction and the second direction respectively float up and down by a third threshold value and a fourth threshold value; and
the initial curvature radiuses of the micro lens units in the first direction and the second direction respectively float up and down by a fifth threshold value and a sixth threshold value; and
the bottom of each microlens cell is added with a random height within a preset range based on a Rand random function.
CN202010646389.2A 2020-07-07 2020-07-07 Diffusion plate and forming method thereof Pending CN113900168A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110161602A (en) * 2018-02-14 2019-08-23 迪睿合株式会社 Diffusing panel, the design method of diffusing panel, display device, projection arrangement and lighting device
CN111239869A (en) * 2020-03-19 2020-06-05 宁波舜宇车载光学技术有限公司 Diffusion plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110161602A (en) * 2018-02-14 2019-08-23 迪睿合株式会社 Diffusing panel, the design method of diffusing panel, display device, projection arrangement and lighting device
CN111239869A (en) * 2020-03-19 2020-06-05 宁波舜宇车载光学技术有限公司 Diffusion plate

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