CN111239863A - Light homogenizer, manufacturing method thereof, light emitting module and electronic equipment - Google Patents

Abstract

The invention discloses a light homogenizer, a manufacturing method thereof, a light emitting module and electronic equipment. The manufacturing method of the light homogenizer comprises the following steps: randomly offsetting vertices of each of a plurality of base polygons within a reference plane to form a plurality of random polygons corresponding to the plurality of base polygons; generating a dodging device model according to the random polygons, the microlens centers and a basic surface type formula; and manufacturing the light homogenizer according to the light homogenizer model. Because the shapes of the micro lenses in the light homogenizer are randomly distributed, the randomness disturbs the interference, and the problem of uneven light spot ripple caused by the interference effect can be effectively eliminated.

Description

Light homogenizer and manufacturing method thereof, light emission module, and electronic equipment

technical field

The invention relates to the field of electronic equipment, in particular to a light homogenizer and a manufacturing method thereof, a light emission module and electronic equipment.

Background technique

A diffuser is a type of micro-optical element that can transform an input beam into a specific output beam, and can generate a specific required spot shape and energy distribution. As shown in Figure 1, most of the light homogenizers on the market are regular micro-lens array elements to achieve uniform spot illumination. Each sub-lens unit in this regular array element has the same shape and size, which is characterized by the arrangement of The structure is simple, easy to design and process inspection, but the periodic structure has obvious interference effect when the coherent light source passes through, as shown in Figure 2, in practical applications, it often produces a ripple-like uneven spot effect, which has adverse effects on practical applications. .

SUMMARY OF THE INVENTION

The invention provides a method for manufacturing a light homogenizer and an electronic device, aiming at solving the problem that the existing light homogenizer often produces a corrugated uneven spot effect in practical applications.

In a first aspect, the present invention provides a method for manufacturing a light homogenizer, wherein the light homogenizer includes a base and a plurality of microlenses disposed on a light exit surface of the base, and the manufacturing method for the light homogenizer includes steps :

Randomly shifting the vertices of each of the plurality of base polygons within a reference plane to form a plurality of random polygons corresponding to the plurality of basic polygons, wherein the reference plane is used to characterize the light-emitting surface of the substrate, There are a plurality of basic polygon areas distributed in the array on the reference plane, each basic polygon area has a corresponding basic polygon and a vertex corresponding to the basic polygon, and the random offset is used to represent the direction, number of times and distance of the vertex offset. At least one is random, and the vertices of any one of the basic polygons after the random offset are used to define a random polygon corresponding to the any one of the basic polygons, and any one of the random polygons is used to represent the corresponding microlens on the substrate. the boundary of the projection;

generating a diffuser model according to the plurality of random polygons, a plurality of microlens centers and a basic surface shape formula, wherein any one of the microlens centers is used to represent the corresponding center of the projection of the microlens on the substrate;

The homogenizer is fabricated according to the homogenizer model.

In the present application, the irregular boundaries of the microlenses on the substrate are formed by random offset. Since the shapes of the plurality of microlenses in the light homogenizer are randomly distributed, the randomness will disrupt their interference, so it can effectively eliminate the The problem of uneven spot ripple caused by interference effect. In addition, the present application controls the random effects of all microlenses through a small number of parameters, which is beneficial to the overall design optimization of the diffuser.

In one embodiment, the step of making the light homogenizer according to the light homogenizer model is specifically: simulating and detecting the optical effect of the light homogenizer model; if the optical effect of the light homogenizer model satisfies If the preset conditions are met, the homogenizer is manufactured according to the homogenizer model;

Wherein, after the step of simulating and detecting the optical effect of the light homogenizer model, the manufacturing method of the light homogenizer further includes the step of: if the optical effect of the light homogenizer model does not meet the preset condition, then adjust at least one of the plurality of random polygons, the centers of the plurality of microlenses and the basic surface shape formula to generate an adjusted diffuser model; simulate and detect the adjusted diffuser model If the optical effect of the adjusted light diffuser model satisfies the preset condition, the light diffuser is manufactured according to the adjusted light diffuser model.

In one embodiment, the vertices are randomly offset by a distance of 0.05a-0.2a, where a is the average value of the side lengths of the basic polygon.

In one embodiment, before the step of generating the light diffuser model according to the plurality of random polygons, the plurality of microlens centers and the basic surface formula, the method for making the light diffuser further includes the step of: A microlens center is randomly determined within each of the random polygons to obtain the plurality of microlens centers.

In one embodiment, the distance between the center of the microlens in any one of the random polygons and the center of the basic polygon corresponding to the any one of the random polygons is b, and b<0.1a, where a is the The average of the side lengths of the underlying polygon.

In a second aspect, the present invention further provides a light homogenizer, which is a light homogenizer manufactured by using the method for manufacturing a light homogenizer according to any one of the various embodiments of the first aspect.

The shapes of the plurality of microlenses in the homogenizer of the present application are randomly distributed, and the randomness will disrupt the interference, so the problem of uneven light spot ripple caused by the interference effect can be effectively eliminated.

In one embodiment, the average side length of the boundary projected by each microlens in the homogenizer on the base of the homogenizer is s, and s is 10 μm-50 μm.

In one embodiment, s is 30 μm-40 μm.

In one embodiment, the microlenses in the light homogenizer all include a top surface away from the base of the light homogenizer, and the radius of curvature at the vertex of the top surface of each of the microlenses is R, and R is 5μm-100μm.

In one embodiment, R is 20 μm-60 μm.

In a third aspect, the present invention further provides a light emission module, including the light homogenizer according to any one of the various embodiments of the second aspect.

In a fourth aspect, the present invention further provides an electronic device, including the light emitting module according to any one of the various embodiments of the third aspect.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the existing light homogenizer;

FIG. 2 is an example of the far-field outgoing light field distribution of the light homogenizer in FIG. 1;

3 is a schematic flowchart of a method for manufacturing a light homogenizer according to an embodiment of the present invention;

4 is a schematic diagram of the distribution of a plurality of random polygons in a method for manufacturing a light homogenizer provided by another embodiment of the present invention;

5 is a schematic diagram of the distribution of a plurality of random polygons in a method for manufacturing a light homogenizer provided by another embodiment of the present invention;

6 is a schematic structural diagram of a light homogenizer provided by an embodiment of the present invention;

FIG. 7 is an example of the far-field outgoing light field distribution of the light homogenizer in FIG. 6 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

A diffuser is a type of micro-optical element that can transform an input beam into a specific output beam, and can generate a specific required spot shape and energy distribution. As shown in Figure 1, most of the light homogenizers on the market are regular micro-lens array elements to achieve uniform spot illumination. Each sub-lens unit in this regular array element has the same shape and size, which is characterized by the arrangement of The structure is simple, easy to design and process inspection, but the periodic structure has obvious interference effect when the coherent light source passes through, as shown in Figure 2, in practical applications, it often produces a ripple-like uneven spot effect, which has adverse effects on practical applications. .

In view of the above problems, as shown in FIG. 3 , the present application provides a method for making a light homogenizer, and the method for making the light homogenizer includes but is not limited to the following steps:

Step S310: Randomly offset the vertices of each of the plurality of basic polygons within the reference plane to form a plurality of random polygons corresponding to the plurality of basic polygons.

Specifically, the homogenizer includes a base and a plurality of microlenses disposed on the base, the base includes opposite light incident surfaces and a light exit surface, and the multiple microlenses are disposed on the light exit surface of the base. When simulating the design of the light homogenizer through software, a reference plane for characterizing the light-emitting surface of the substrate is preset, that is, the reference plane is equivalent to the light-emitting surface of the substrate. As shown in FIG. 4 and FIG. 5 , a plurality of basic polygon areas are distributed in an array on the reference plane, and each basic polygon area has a corresponding basic polygon and vertices corresponding to the basic polygon. The basic polygonal area is generally a regular polygonal area such as a triangle, a quadrilateral, and a pentagon. For example, the basic polygonal area is a rectangular area, and the rectangular area has a rectangular boundary and four vertices.

The vertices of each basic polygon are randomly offset in the reference plane, and the random offset means that at least one of the direction, times and distance of the vertices offset in the reference plane is random. Optionally, in a specific embodiment, the distance by which any vertex of any basic polygon is randomly offset is 0.05a-0.2a, where a is the average value of the side lengths of the basic polygon.

The vertices of any basic polygon after random offset are used to define a random polygon corresponding to any basic polygon, that is, the randomly offset vertices of a basic polygon can be connected to form a random polygon, then multiple basic polygons are connected. The randomly shifted vertices are connected respectively, and then a plurality of random polygons can be formed correspondingly, wherein any random polygon is used to represent the boundary of the projection of the corresponding microlens on the substrate, that is, a random polygon represents the projection of a microlens on the substrate. border. For example, as shown in Figure 4, the basic polygon is a quadrilateral, and the four vertices D1, D2, D3 and D4 of a basic polygon A1 are randomly offset once (the arrow in Figure 4 is the direction of the vertex offset), and the partial By connecting the shifted vertices d1, d2, d3, and d4 in sequence, the random polygon S1 corresponding to the basic polygon A1 can be obtained by connecting the shifted vertices d1, d2, d3, and d4 in sequence.

Since at least one of the direction, number of times and distance of offset of each vertex of a basic polygon is random, then the number of sides, the length of sides and the angle between two adjacent sides of the random polygon formed by the basic polygon are random. are also random, so multiple random polygons of different shapes can be formed from multiple basic polygons. For example, when the basic polygon is a quadrilateral, if each vertex of the quadrilateral is randomly changed to 1 to 2 vertices, 4-8 polygons can be randomly generated. For example, as shown in Figure 5, the basic polygon A2 is a quadrilateral , a vertex D5 of the basic polygon A2 is randomly offset twice (the arrow in Figure 5 is the direction of vertex offset), then two offset vertices d51 and d52 can be obtained from one vertex D5. For another example, when the basic polygon is an octagon, if each vertex of any four vertices in the octagon is randomly offset once, then each vertex will generate 0 to 1 vertex (the vertex becomes 0). One refers to the coincidence of the two offset vertices in the octagon, and then the two vertices become one vertex, which is equivalent to eliminating one vertex), then 4-8 polygons can also be randomly generated.

Step S320: Generate a diffuser model according to the plurality of random polygons, the plurality of microlens centers and the basic surface shape formula.

Specifically, the center of any microlens is used to represent the center of the projection of the corresponding microlens on the substrate. The plurality of microlens centers may be preselected. Of course, the centers of the plurality of microlenses may also be randomly selected. For example, in a specific embodiment, according to the plurality of random polygons, the centers of the plurality of microlenses, and the formula for the basic surface shape, the homogenizer is generated Before the step of modeling, the manufacturing method of the light homogenizer further includes the step of randomly determining a microlens center in each of the random polygons to obtain the plurality of microlens centers. In this way, the center of the microlenses in each random polygon is set at a random position in the random polygon, so that the shapes and centers of the plurality of microlenses are randomly distributed, which is beneficial to effectively eliminate the uneven spot ripple caused by the interference effect. Optionally, in a specific embodiment, the distance between the center of the microlens in any random polygon and the center of the basic polygon corresponding to any random polygon is b, and b<0.1a, where a is the basis The average of the side lengths of the polygons.

Determining multiple random polygons and multiple microlens centers is equivalent to determining the boundary and center of the projection of multiple microlenses on the substrate. Combined with the pre-selected basic surface formula of the microlens, the multiple microlenses can be uniquely determined. Morphology of a microlens. Among them, the basic surface formula can be selected according to the actual situation. For example, the base surface formula may be the even-order aspheric formula 1-1.

Among them, r ² =x ² +y ² , c=1/R, R is the curvature radius of the vertex of the surface, k is the conic coefficient, α ₁ , α ₂ , α ₃ , α ₄ , α ₅ , α ₆ are higher-order terms coefficient. Optionally, Formula 1-1 may adopt the following two sets of parameters.

R k α₁ α₂ α₃ α₄ α₅ parameter group 1 0.013888 -1.16301 0 5684.618896 -1.256212237e⁷ 6.481978431e⁹ 0 parameter group 2 0.021081 -0.7528 0 0 0 0 0

For another example, the basic surface type formula may be the biconical surface formula 1-2.

Among them, c _x , _cy , k _x , and _ky are the vertex curvature and conic coefficient of the x and y sections, respectively.

Step S330: Manufacture the light homogenizer according to the light homogenizer model.

Specifically, after the homogenizer model is obtained, the homogenizer can be fabricated according to the design parameters of the homogenizer model. Optionally, making a light homogenizer according to the light homogenizer model can be achieved by the following steps.

First, the optical effects of the diffuser model are simulated and tested.

Then, if the optical effect of the homogenizer model satisfies a preset condition, the homogenizer is fabricated according to the homogenizer model.

Specifically, after generating the diffuser model according to design parameters such as multiple random polygons, multiple microlens centers, and basic surface formula, software can be used to simulate the overall optical effect of the diffuser model. If the optical effect of the diffuser model meets the preset conditions, the diffuser is fabricated according to the diffuser model. If the optical effect of the diffuser model does not meet the preset conditions, adjust various design parameters until the optical effect of the diffuser model generated according to the adjusted design parameters satisfies the preset conditions. Among them, there are many ways to adjust various design parameters, which can be to adjust the curvature coefficient, conic coefficient, high-order coefficient, etc. corresponding to the surface shape in the basic surface shape formula. For example, when the basic surface shape formula is a spherical formula, By adjusting the R value of the spherical formula, the focusing effect of the overall component can be significantly adjusted; it can also be adjusted to allow random offset data. The effect of each random offset data is different. It is necessary to generate random data multiple times to find the most random offset data. best random data.

Optionally, if the optical effect of the diffuser model does not meet the preset conditions, adjust at least one of the multiple random polygons, the multiple microlens centers, and the basic surface formula to generate an adjusted diffuser model. ; Simulate and detect the optical effect of the adjusted diffuser model; if the optical effect of the adjusted diffuser model satisfies the preset conditions, make a diffuser according to the adjusted diffuser model.

In the present application, the irregular boundaries of the microlenses on the substrate are formed by random offset. Since the shapes of the plurality of microlenses in the light homogenizer are randomly distributed, the randomness will disrupt their interference, so it can effectively eliminate the The problem of uneven spot ripple caused by interference effect. In addition, the present application controls the random effects of all microlenses through a small number of parameters, which is beneficial to the overall design optimization of the diffuser.

The present application also provides a light homogenizer, which is a light homogenizer manufactured by using the above-mentioned manufacturing method of a light homogenizer.

As shown in FIG. 6 , the diffuser 100 includes a substrate (not shown in the figure) and a plurality of microlenses 1 . The substrate includes opposite light incident surfaces and light outgoing surfaces, and a plurality of microlenses 1 are disposed on the light outgoing surfaces of the substrate. Also, each microlens 1 includes a bottom surface close to the substrate and a top surface away from the substrate.

In a specific embodiment, the average side length of the boundary projected by each microlens 1 on the substrate is s, and s is 10 μm-50 μm. By optimizing the range of s, not only the problem that the microlens 1 is too large or too small is not conducive to processing and molding, but also the problem that the microlens 1 is too small to cause the diffraction effect to become stronger and the reflected light to be difficult to control. Further, s is 30 μm-40 μm.

In a specific embodiment, the radius of curvature at the vertex of the top surface of each microlens 1 (the vertex of each microlens 1 is the intersection between the top surface of the microlens 1 and the optical axis) is R, and R is 5 μm-100 μm. The R value is usually related to the s value. In actual design, the optimal R value is between 0.5-2 times the s value. By optimizing the R value range, it is beneficial to realize product design. Further, R is 20 μm-60 μm.

The shapes of the plurality of microlenses 1 in the homogenizer 100 of the present application are randomly distributed, and the randomness will disrupt the interference, so the problem of uneven spot ripple caused by the interference effect can be effectively eliminated (please compare FIG. 2 and FIG. 2 ). 7. The existing light homogenizer has a ripple problem, while the light homogenizer 100 of the present application has no ripple problem).

The present application also provides a light emitting module, the light emitting module comprising the above-mentioned light homogenizer.

The present application also provides an electronic device, which can be a tablet computer, a mobile phone, a notebook computer, a vehicle-mounted device, a wearable device, a flashlight, a desk lamp, or a projection lamp and other devices. Specifically, the electronic device includes the above-mentioned light emitting module.

The embodiments of the present application have been introduced in detail above, and the principles and implementations of the present application are described in this paper by using specific examples. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application; at the same time, for Persons of ordinary skill in the art, based on the idea of the present application, will have changes in the specific implementation manner and application scope. In summary, the contents of this specification should not be construed as limitations on the present application.

Claims (12)

1. A method for manufacturing a light homogenizer comprises a substrate and a plurality of micro lenses arranged on a light emergent surface of the substrate, and is characterized by comprising the following steps:

randomly offsetting vertexes of each basic polygon in a reference plane to form a plurality of random polygons corresponding to the basic polygons, wherein the reference plane is used for representing the light emergent surface of the substrate, a plurality of basic polygon areas are distributed on the reference plane in an array manner, each basic polygon area is provided with a corresponding basic polygon and vertexes of the corresponding basic polygon, the random offsets are used for representing that at least one of the direction, the number and the distance of the vertex offsets is random, the vertexes of any one basic polygon after the random offsets are used for defining the random polygon corresponding to the any one basic polygon, and any one random polygon is used for representing the projection boundary of the corresponding microlens on the substrate;

generating a dodging device model according to the random polygons, the centers of the microlenses and a basic surface type formula, wherein the center of any microlens is used for representing the center of the projection of the corresponding microlens on the substrate;

and manufacturing the light homogenizer according to the light homogenizer model.

2. The method for manufacturing the light homogenizer of claim 1, wherein the step of manufacturing the light homogenizer according to the light homogenizer model comprises:

simulating and detecting the optical effect of the light homogenizer model;

if the optical effect of the light homogenizer model meets a preset condition, manufacturing the light homogenizer according to the light homogenizer model;

after the step of simulating and detecting the optical effect of the light homogenizer model, the method for manufacturing the light homogenizer further comprises the following steps:

if the optical effect of the dodging device model does not meet the preset condition, adjusting at least one of the random polygons, the centers of the microlenses and the basic surface type formula to generate an adjusted dodging device model;

simulating and detecting the optical effect of the adjusted dodging device model;

and if the optical effect of the adjusted light homogenizer model meets the preset condition, manufacturing the light homogenizer according to the adjusted light homogenizer model.

3. The method of claim 1, wherein the vertices are randomly shifted by a distance of 0.05a to 0.2a, where a is an average of the side lengths of the base polygon.

4. The method of fabricating a homogenizer according to claim 1, wherein prior to the step of generating a homogenizer model from the plurality of random polygons, the plurality of microlens centers, and a base surface type formula, the method of fabricating a homogenizer further comprises the steps of:

and randomly determining a microlens center in each random polygon to obtain the plurality of microlens centers.

5. The method as claimed in claim 4, wherein a distance between the center of the microlens in any one of the random polygons and the center of the basic polygon corresponding to the any one of the random polygons is b, and b < 0.1a, where a is an average value of the side lengths of the basic polygon.

6. A light homogenizer characterized by being manufactured by the method of manufacturing a light homogenizer according to any one of claims 1 to 5.

7. The light homogenizer of claim 6, wherein each microlens in the light homogenizer has a boundary projected on a substrate of the light homogenizer with an average side length s, and s is from 10 μm to 50 μm.

8. The light homogenizer of claim 7, wherein s is from 30 μm to 40 μm.

9. The light homogenizer of claim 6, wherein the microlenses in the light homogenizer each include a top surface distal from the base of the light homogenizer, the top surface of each of the microlenses having a radius of curvature at its apex of R, and R is from 5 μm to 100 μm.

10. The light homogenizer of claim 9, wherein R is 20 μm to 60 μm.

11. A light emitting module comprising the light homogenizer of any one of claims 6 to 10.

12. An electronic device comprising the light-emitting module according to claim 11.

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