CN217543430U

CN217543430U - Microlens array substrate, microlens array projection device and vehicle

Info

Publication number: CN217543430U
Application number: CN202220986841.4U
Authority: CN
Inventors: 关赛新
Original assignee: Jiangxi OMS Microelectronics Co Ltd
Current assignee: Jiangxi OMS Microelectronics Co Ltd
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-10-04
Anticipated expiration: 2032-04-26

Abstract

The utility model discloses a microlens array base plate, microlens array projection arrangement and vehicle. The micro-lens array substrate comprises a substrate layer, a pattern layer, a first micro-lens layer, a light shielding layer and a second micro-lens layer. The substrate layer has the first surface and the second surface that set up back to back, and the pattern layer is located on the first surface, and the one side that deviates from the first surface of pattern layer is located to first microlens layer, and the light shield layer is located on the second surface to and the one side that deviates from the second surface of light shield layer is located to second microlens layer. The utility model discloses can make microlens array substrate realize slimming, miniaturized design to when microlens array substrate is applied to microlens array projection arrangement, can reduce the occupation to microlens array projection arrangement's space, thereby make microlens array projection arrangement also can realize miniaturized design.

Description

Microlens array substrate, microlens array projection device and vehicle

Technical Field

The utility model relates to an optical imaging technical field especially relates to a microlens array substrate, microlens array projection arrangement and vehicle.

Background

Projection technology is widely used in the fields of image display, greeting illumination, stage illumination and the like. The projection device of the related art includes a light source, a film, and a projection lens, wherein the light source is used for emitting light, the projection lens includes a plurality of lenses sequentially arranged along a light emitting direction, and the projection lens is used for enlarging and projecting a pattern image of the film to the front. However, the projection lens occupies a large space due to the large size of the lens, which results in a large overall size of the projection lens and a large volume of the projection device.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a microlens array base plate, microlens array projection arrangement and vehicle make microlens array base plate slim, miniaturization.

In order to achieve the above object, the present invention discloses a microlens array substrate, including: the substrate layer is provided with a first surface and a second surface which are arranged oppositely; a pattern layer disposed on the first surface, the pattern layer including micropattern units; the first micro-lens layer is arranged on one side, away from the first surface, of the pattern layer and comprises first micro-lens units, and the first micro-lens units are arranged corresponding to the micro-pattern units; the light shielding layer is arranged on the second surface and comprises a hollowed-out unit, and the hollowed-out unit is arranged corresponding to the micro-pattern unit; and the second micro-lens layer is arranged on one side, departing from the second surface, of the light shielding layer and comprises a second micro-lens unit, and the second micro-lens unit corresponds to the hollow unit.

The microlens array substrate is characterized in that the first microlens layer and the second microlens layer are respectively arranged on two opposite sides of the base material layer, the pattern layer is arranged between the first microlens layer and the base material layer, the light shielding layer is arranged between the base material layer and the second microlens layer, and therefore the first microlens layer, the pattern layer, the light shielding layer and the second microlens layer are integrated on the base material layer.

As an alternative embodiment, the first surface of the substrate layer is configured to be disposed toward the light-emitting source. Because the first micro-lens layer is arranged on the first surface, light emitted by the light emitting source firstly passes through the first micro-lens layer, and can be uniformly projected to the pattern layer by utilizing the first micro-lens layer, so that the optical uniformity of the micro-lens array substrate is effectively improved.

As an optional implementation manner, the first microlens layer includes a plurality of first microlens units arranged in an array, the pattern layer includes a plurality of micropattern units arranged in an array, each of the first microlens units is respectively arranged in one-to-one correspondence with each of the micropattern units, the second microlens layer includes a plurality of second microlens units arranged in an array, each of the second microlens units is respectively in one-to-one correspondence with each of the first microlens units, the light shielding layer includes a plurality of hollow units arranged in an array, and each of the second microlens units is respectively in one-to-one correspondence with each of the hollow units.

The incident light rays sequentially pass through the first micro-lens layer, the pattern layer, the base material layer, the light shielding layer and the second micro-lens layer. The multiple first micro-lens units divide incident light into multiple beams of light, each first micro-lens unit projects the divided light to the corresponding micro-pattern unit respectively, after micro-patterns are formed through the micro-pattern units, the divided light is projected to the corresponding hollow-out units, the hollow-out units shield stray light in the light and then project the stray light to the corresponding second micro-lens units, the multiple second micro-lens units can generate image superposition before and after the focal length when the multiple second micro-lens units project and image at different positions and angles simultaneously, and the image after the superposition improves definition. Therefore, by adopting the micro-lens array substrate, the volume of the micro-lens array substrate is effectively reduced on the basis of ensuring the imaging effect through the design of each micro-unit.

As an alternative embodiment, the projection of the hollow unit along the direction perpendicular to the first surface is located on the diaphragm of the corresponding first microlens unit.

The first micro-lens units are provided with the diaphragms, light emitted by the luminous source is cut through the diaphragms of each first micro-lens unit and is divided into a plurality of light beams to be projected to the corresponding micro-pattern units, the hollow units are located on the corresponding diaphragms along the projection in the direction perpendicular to the first surface, the light can be projected to a target irradiation surface through the second lens layer units, and the light passing efficiency is high. Meanwhile, stray light with a large incident angle can be shielded through the hollow structure, so that the optical efficiency and the optical uniformity are improved.

As an alternative embodiment, the focal point of the second microlens unit in the direction perpendicular to the second surface is located on the corresponding micropattern unit. Thus, when the microlens array substrate is applied to a microlens array projection apparatus, or even a vehicle, by the above design, it is possible to realize a clearer superimposed image at a distance away from the focal point, that is, to realize an inclined projection illumination with a large area, a clear image, and a uniform brightness, by making the projected image in a long range both before and after the focal point clear.

The optical system can realize the effect of a wider focal depth, and the large-angle inclined projection can also be imaged into a clear pattern.

In an alternative embodiment, the pattern layer and the second microlens layer form an optical system, and the focal length of the optical system is between 0.1mm and 3 mm; the optical system satisfies the conditional expression: TTL/ImgH is more than or equal to 1 and less than or equal to 10, wherein TTL is the distance between the surface of the light inlet side of the micro pattern unit and the surface of the light outlet side of the second micro lens unit on the optical axis, and Imgh is half of the height of the corresponding image of the maximum field angle of the optical system; first microlens unit is including relative first income plain noodles and first play plain noodles, first play plain noodles is located deviating from on pattern layer one side of first surface, first income plain noodles is convex cambered surface, follows on the optical axis direction of first microlens unit, the summit of first income plain noodles extremely the distance of first play plain noodles is between 15um-200um, and/or, second microlens unit includes relative second income plain noodles and second play plain noodles, the second is gone into the plain noodles and is located deviating from of light shield layer one side of second surface, the second goes out the plain noodles and is convex cambered surface, follows on the optical axis direction of second microlens unit, the summit of second play plain noodles extremely the distance of second income plain noodles is between 15um-200 um. By limiting the optical system to meet the range, the total length of the optical system can be reasonably compressed on the basis of ensuring good imaging quality, so that the total length of the micro-lens array substrate can be favorably compressed, and the thin and small design of the micro-lens array substrate is realized. Meanwhile, the imaging surface of the projection realizes a larger range of focal depth, so that the projected image in a long range before and after the focal point can be very clear, and large-area, clear and uniform-brightness inclined projection illumination is realized.

As an alternative embodiment, the micropattern unit comprises a light-transmitting area and a light-shielding area arranged around the light-transmitting area, the light-transmitting area is formed with micropatterns, and the micropatterns on each micropattern unit are different in shape or not identical, so that imaging on an imaging plane which is not perpendicular to the optical axis is clear and the distance brightness is kept consistent.

Only the micro-pattern part in the micro-pattern unit is transparent, the other part is opaque, and each micro-pattern in the micro-pattern unit is different. The corresponding first microlens unit and the corresponding second microlens unit correspond to the same micro pattern, respectively. Most micropatterns are only a portion of them compared to the complete pattern illuminated on the imaging surface. By adjusting the shapes of the micro-patterns on different micro-pattern units, more light beams can irradiate the farther position of the imaging surface, and less light beams can irradiate the nearer position of the imaging surface. Therefore, the problem that the far part is darker than the near part can be avoided, the brightness of the pattern on the imaging surface is uniformly distributed, and the near-far imaging definition is close to or even the same effect is realized.

The invention provides a micro-lens array projection device which comprises a light source, a light uniformizing lens group and the micro-lens array substrate, wherein the light uniformizing lens group is arranged between the light source and the micro-lens array substrate. The micro-lens array substrate is small in size and thin, and the micro-lens array projection device is small in size and thin.

The invention provides a vehicle, which comprises a main body part and the micro-lens array substrate, wherein the micro-lens array substrate is small in size and thin, and the micro-lens array projection device is also small in size and thin.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the microlens array substrate is characterized in that the first microlens layer and the second microlens layer are arranged on two opposite sides of the base material layer respectively, the pattern layer is arranged between the first microlens layer and the base material layer, the light shielding layer is arranged between the base material layer and the second microlens layer, the first microlens layer, the pattern layer, the light shielding layer and the second microlens layer are integrated on the base material layer, and therefore the microlens array substrate can be thinned and miniaturized.

Drawings

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

Fig. 1 is a schematic structural diagram of a microlens array substrate according to an embodiment of the present invention;

fig. 2 is a schematic view of an optical path of a light shielding layer disclosed in an embodiment of the present invention;

fig. 3 is a design example of the micropattern unit arranged in an array according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a microlens array projection apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

Description of the main reference numerals:

1. a microlens array substrate; 11. a substrate layer; 12. a first microlens layer; 121. a first microlens unit; 13. a pattern layer; 131. a micropattern unit; 14. a second microlens layer; 141. a second microlens unit; 15. a light-shielding layer; 151. a hollow unit; m, a central axis; 111. a first surface; 112. a second surface; 2. a light emitting source; 3. a light uniformizing lens group; 100. a microlens array projection device; 200. a body portion; 1000. a vehicle.

Detailed Description

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

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meaning of these terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, a first aspect of the present disclosure provides a microlens array substrate 1, where the microlens array substrate 1 can be applied to a microlens array projection apparatus 100, so that the microlens array projection apparatus 100 can be applied to, for example, a vehicle and an electronic product, and further projection illumination is achieved. For example, when the micro-lens array projection apparatus 100 is applied to a vehicle, the micro-lens array projection apparatus 100 can be used as a welcome lamp, a ground direction lamp, a ground braking distance warning lamp, etc. for projecting and illuminating the ground. Specifically, the microlens array substrate 1 includes at least a base material layer 11, a first microlens layer 12, a pattern layer 13, a second microlens layer 14, and a light-shielding layer 15. The substrate layer 11 has a first surface 111 and a second surface 112 opposite to each other. The pattern layer 13 is disposed on the first surface 111, and the pattern layer 13 includes a micro pattern unit 131. The first microlens layer 12 is disposed on a side of the pattern layer 13 away from the first surface 111, the first microlens layer 12 includes a first microlens unit 121, and the first microlens unit 121 is disposed corresponding to the micropattern unit 131. The light-shielding layer 15 is disposed on the second surface 112, the light-shielding layer 15 includes a hollow unit 151, and the hollow unit 151 and the micro pattern unit 131 are disposed correspondingly. The second microlens layer 14 is disposed on a side of the light shielding layer 15 away from the second surface 112, the second microlens layer 14 includes a second microlens unit 141, and the second microlens unit 141 corresponds to the hollow unit 151.

In the microlens array substrate 1, the first microlens layer 12 and the second microlens layer 14 are respectively disposed on two opposite sides of the substrate layer 11, the pattern layer 13 is disposed between the first microlens layer 12 and the substrate layer 11, and the light shielding layer 15 is disposed between the substrate layer 11 and the second microlens layer 14, so that the first microlens layer 12, the pattern layer 13, the light shielding layer 15, and the second microlens layer 14 are integrated on the substrate layer 11, and thus, the microlens array substrate 1 can be designed to be thin and small, and when the microlens array substrate 1 is applied to the microlens array projection apparatus 100, the space occupied by the microlens array projection apparatus 100 can be reduced, and the microlens array projection apparatus 100 can also be designed to be small.

In some embodiments, the substrate layer 11 may be a light-transmissive substrate, such as a glass substrate or a plastic substrate, which is not limited in this embodiment. For example, the substrate layer 11 may be a glass substrate, so that when the first microlens layer 12 and the pattern layer 13 are disposed on the first surface 111 of the substrate layer 11, and the light shielding layer 15 and the second microlens layer 14 are disposed on the second surface 112 of the substrate layer 11, since the substrate layer 11 is made of a transparent material, the incident and the outgoing of light are not affected, and thus the accuracy of projecting a pattern to the ground can be improved, and the imaging quality is ensured.

In some embodiments, the first surface 111 of the substrate layer 11 is configured to be disposed toward the light source 2, and since the first microlens layer 12 is disposed on the first surface 111, light emitted from the light source 2 first passes through the first microlens layer 12, and the first microlens layer 12 can realize light uniformization and then project the light to the pattern layer 13, thereby effectively improving the optical uniformity of the microlens array substrate 1.

In some embodiments, when the pattern layer 13, the first microlens layer 12, the second microlens layer 14, and the light shielding layer 15 are disposed on the substrate layer 11, the pattern layer 13 and the light shielding layer 15 can be formed by plating a chrome layer or a black glue layer on the first surface 111 and the second surface 112 of the substrate layer 11, and then removing the chrome layer or the black glue layer by a laser direct writing or a developing etching method. Then, the first microlens layer 12 is formed on the surface of the pattern layer 13 by imprinting or reflow, and the second microlens layer 14 is formed on the surface of the light-shielding layer 15, thereby forming the microlens array substrate 1.

In some embodiments, the first microlens layer 12 includes a plurality of first microlens units 121 arranged in an array, the pattern layer 13 includes a plurality of micropattern units 131 arranged in an array, each of the first microlens units 121 corresponds to each of the micropattern units 131 one by one, the second microlens layer 14 includes a plurality of second microlens units 141 arranged in an array, each of the second microlens units 141 corresponds to each of the first microlens units 121 one by one, the light shielding layer 15 includes a plurality of hollow units 151 arranged in an array, and each of the second microlens units 141 corresponds to each of the hollow units 151 one by one. That is, the number of the first microlens units 121, the number of the micropattern units 131, the number of the cutout units 151, and the number of the second microlens units 141 correspond to one another.

It should be noted that the one-to-one correspondence between the first microlens units 121 and the micropattern units 131 mainly refers to a positional correspondence and a quantitative correspondence, and the positional correspondence includes a complete correspondence and a partial correspondence.

Incident light beams pass through the first microlens layer 12, the pattern layer 13, the base material layer 11, the light shielding layer 15, and the second microlens layer 14 in this order. The plurality of first microlens units 121 divide incident light into a plurality of beams of light, each first microlens unit 121 projects the divided light to the corresponding micropattern unit 131, the micropattern is formed by the micropattern units 131 and then projected to the corresponding hollowed-out unit 151, the hollowed-out unit 151 shields stray light in the light and then projects the stray light to the corresponding second microlens unit 141, when the plurality of second microlens units 141 project images from different positions and angles at the same time, image superposition can be generated before and after the focal length, and the definition of the superposed image is improved. By adopting the micro-lens array substrate 1 of the application, the volume of the micro-lens array substrate 1 is effectively reduced on the basis of ensuring the imaging effect through the design of each micro-unit.

It is understood that, in other embodiments, the number of the first microlens units 121, the number of the micropattern units 131, the number of the cutout units 151, and the number of the second microlens units 141 may not correspond to one another, for example, the number of the first microlens units 121 may be greater than or less than the number of the micropattern units 131, and the number of the cutout units 151 may be greater than or less than the number of the second microlens units 141.

Referring to fig. 2, in some embodiments, the first microlens layer 12 is disposed on the first surface 111 of the substrate layer 11, the first microlens layer 12 includes a plurality of first microlens units 121 arranged in an array, and the light emitted from the light source 2 is cut by the diaphragm of each first microlens unit 121 by disposing the diaphragm on the first microlens unit 121, and is divided into a plurality of light beams to be projected onto the corresponding micropattern unit 131. The light-shielding layer 15 is disposed on the second surface 112 of the substrate layer 11, the light-shielding layer 15 includes a plurality of hollow units 151 arranged in an array, and each first microlens unit 121 corresponds to each hollow unit 151 one to one. It can be understood that when the light shielding layer 15 identifies the area of the object cutting line in fig. 2, the light shielding area and the area not shielded from light form the hollow unit 151, and the center of the hollow unit 151 coincides with the center of the corresponding first microlens unit 121 in the direction perpendicular to the first surface 111, as shown by the central axis m, the projection of the hollow unit 151 along the direction perpendicular to the first surface 111 is located on the stop of the corresponding first microlens unit 121. All light rays can be projected to the target irradiation surface through the second lens layer unit 141, and the light transmission efficiency is high. Because the light needs to pass through the hollow unit 151 and then be projected to the corresponding second microlens unit 141 for focusing and imaging. Therefore, the structure of the light-shielding layer 15 can shield stray light with a large incident angle through each hollowed-out unit 151, thereby improving the consistency of the definition of the image formed after being projected onto the second microlens unit 141, and effectively improving the imaging effect of the microlens array substrate.

Illustratively, as shown in fig. 2, L1 is vertical light and L2 is non-vertical light. The vertical light is light perpendicular to the first light incident surface of the first microlens unit 121, and is otherwise non-vertical light. The incident angle of L2 is a, and the closer to the edge of the first microlens unit 121, the larger the incident angle of the incident light. The larger the refractive loss of the incident light after entering the first microlens unit 121. The L2 is the light with the largest incident angle that can enter the first microlens unit 121, that is, the hollow unit 151 can shield stray light with an incident angle larger than a, that is, light with lower definition after incident imaging, and the definition of incident light incident imaging with an incident angle smaller than a is greater than or equal to the definition of incident imaging of the incident light L2, so that the consistency of the definition of an image formed by projecting the incident light to the second microlens unit 141 is improved, the light condensing efficiency of the second microlens unit 141 is improved, and the imaging effect is improved.

In some embodiments, the focal point of the second microlens unit 141 in the direction perpendicular to the second surface 112 is located on the corresponding micropattern unit 131. In this way, when the microlens array substrate 1 is applied to the microlens array projection apparatus 100 or even to the vehicle 1000, the superimposed image at the off-focus distance can be made clearer by the above-described design, that is, the projected image in a long range before and after the focus can be made clearer, thereby realizing oblique projection lighting with a large area, clearness, and uniform brightness.

In some embodiments, the pattern layer 13 and the second microlens layer 14 form an optical system, and the focal length of the optical system is between 0.1mm and 3 mm. The focal length of the optical system is limited to meet the range, so that the focal length of the optical system can be reasonably compressed on the basis of ensuring good imaging quality, the total length of the micro-lens array substrate 1 is favorably compressed, and the thin and small design of the micro-lens array substrate 1 is realized.

In a specific embodiment, the optical system satisfies the conditional expression: TTL/ImgH is greater than or equal to 1 and less than or equal to 10, where TTL is a distance on an optical axis from a surface of the light incident side of the micropattern unit 131 to a surface of the light emergent side of the second microlens unit 141, and ImgH is a half of a height of an image corresponding to a maximum field angle of the optical system. When the optical system satisfies the above conditional expressions, the total length of the optical system can be effectively reduced, which is beneficial to reduce the total length of the microlens array substrate 1. The micro lens array substrate 1 is thin and small, and meanwhile, the micro lens array substrate 1 has enough imaging size and can increase relative illumination, so that the imaging quality of the micro lens array substrate 1 is improved.

In a specific embodiment, the first microlens unit 121 includes a first light incident surface and a first light emitting surface, the first light emitting surface is disposed on a side of the pattern layer 13 departing from the first surface 111, the first light incident surface is a convex arc surface, a distance from a vertex of the first light incident surface to the first light emitting surface is between 15um and 200um along an optical axis direction of the first microlens unit 121, and/or,

second microlens unit 141 includes relative second income plain noodles and second play plain noodles, the second goes into the plain noodles and locates what light shield layer 15 deviates from one side of second surface 112, the second goes out the plain noodles and is the convex cambered surface, follows in second microlens unit 141's the optical axis direction, the summit that the second goes out the plain noodles is extremely the distance that the second goes into the plain noodles is between 15um-200 um.

That is, the distance from the vertex of the first light incident surface of the first microlens unit 121 to the first light emitting surface is between 15um and 200um, and the distance from the vertex of the second light emitting surface of the second microlens unit 141 to the second light incident surface is between 15um and 200um, which can be satisfied at the same time, or only one of them can be satisfied.

When the optical system satisfies the above conditional expressions, the total length of the optical system can be effectively reduced, which is beneficial to reduce the total length of the microlens array substrate 1.

Considering that the pattern layer 13 and the second microlens layer 14 together form an optical system, relevant parameters of the optical system will be exemplified below with reference to examples.

In the first example, the light emitting surface of the second microlens unit 141 is convex at the paraxial region. The effective focal length f =2.08mm, f-number FNO =2.50 and TTL/ImgH =8.17.

Table 1a shows the relevant parameters of the second microlens layer 14, along the optical axis direction, the surface with smaller surface number is the object side surface of the lens, the surface with larger surface number is the image side surface of the lens, for example, S1 is the object side surface of the second microlens unit 141, and S2 is the image side surface of the second microlens unit 141. The Y radius in table 1a is the radius of curvature of the object-side or image-side surface of the corresponding surface number at the optical axis. The first value of the thicknesses in table 1a is the thickness of the second microlens unit 141 on the optical axis, and the second value is the distance from the image side of the second microlens unit 141 to the image plane, for example, S2 to the image plane on the optical axis. The units of the Y radius, thickness and focal length are millimeters (mm).

TABLE 1a

Number of noodles

Surface name

Surface type

Radius of Y

Thickness of

Refractive index

Abbe number

Focal length

Article surface

Spherical surface

Infinite number of elements

3.000

1.517

64.2

S1

Side of the object

Spherical surface

Infinite number of elements

0.105

1.515

54.3

2.08488

S2

Image side

Aspherical surface

-0.931

1500

Image plane

Spherical surface

Infinite number of elements

In this embodiment, the image-side surface of the second microlens unit 141 is an aspheric surface, and the surface type x of each aspheric surface can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1a above); k is the cone coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 1b shows the coefficients of the high-order terms A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the respective aspherical mirrors S1 to S14 in the first embodiment.

TABLE 1b

In the second example, the light emitting surface of the second microlens unit 141 is convex at the paraxial region. The effective focal length f =2.00mm, f-number FNO =2.73 and TTL/ImgH =8.24.

Table 2a shows the relevant parameters of the second microlens layer 14, along the optical axis direction, the surface with smaller surface number is the object side surface of the lens, the surface with larger surface number is the image side surface of the lens, for example, S1 is the object side surface of the second microlens unit 141, and S2 is the image side surface of the second microlens unit 141. The Y radius in table 2a is the radius of curvature of the object-side or image-side surface at the optical axis for the corresponding surface number. The first value of the thicknesses in table 2a is the thickness of the second microlens unit 141 on the optical axis, and the second value is the distance from the image side surface of the second microlens unit 141 to the image plane, for example, S2 to the image plane on the optical axis. The units of the Y radius, thickness and focal length are millimeters (mm).

TABLE 2a

Number of noodles

Surface name

Surface type

Radius of Y

Thickness of

Refractive index

Abbe number

Focal length

Article surface

Spherical surface

Infinite number of elements

3.200

1.517

64.2

S1

Side of the object

Spherical surface

Infinite number of elements

0.097

1.515

54.3

2.00549

S2

Image side

Aspherical surface

-1.037

1000

Image plane

Spherical surface

Infinite number of elements

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e. paraxial curvature c is the inverse of the Y radius R in table 2a above); k is the conic coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2b shows the coefficients of the high-order terms A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the respective aspherical mirrors S1 to S14 in the first embodiment.

TABLE 2b

In the third example, the light emitting surface of the second microlens unit 141 is convex at the paraxial region. The effective focal length f =2.08mm, the f-number FNO =2.5, and the TTL/ImgH =7.76.

Table 3a shows the relevant parameters of the second microlens layer 14, along the optical axis direction, the surface with smaller number of faces is the object side face of the lens, the surface with larger number of faces is the image side face of the lens, for example, S1 is the object side face of the second microlens unit 141, and S2 is the image side face of the second microlens unit 141. The Y radius in table 3a is the radius of curvature of the object-side or image-side surface at the optical axis for the corresponding surface number. The first value of the thicknesses in table 3a is the thickness of the second microlens unit 141 on the optical axis, and the second value is the distance from the image side of the second microlens unit 141 to the image plane, e.g., S2 to the image plane on the optical axis. The units of the Y radius, thickness and focal length are millimeters (mm).

TABLE 3a

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 3a above); k is the cone coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 3b shows the coefficients of the high-order terms A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the respective aspherical mirrors S1 to S14 in the first embodiment.

TABLE 3b

The above three embodiments can achieve good projection imaging quality, and the microlens array substrate 1 is thinned. By limiting the optical system to meet the range, the total length of the optical system can be reasonably compressed on the basis of ensuring good imaging quality, so that the total length of the micro-lens array substrate can be favorably compressed, and the thin and small design of the micro-lens array substrate is realized. Meanwhile, the imaging surface of the projection realizes a larger range of focal depth, so that the projected image in a long range before and after the focal point can be very clear, and large-area, clear and uniform-brightness inclined projection illumination is realized.

In some embodiments, the micropattern unit 131 includes a light-transmitting region, such as a region shown by the middle section line of the pattern layer 13 in fig. 1, where the micropattern is formed, and a light-shielding region disposed around the light-transmitting region, where the shape of the micropattern on each micropattern unit 131 is different or not completely the same, so that imaging on an imaging plane not perpendicular to the optical axis is clear and the distance brightness is uniform.

In some embodiments, the first microlens layer 12 and the second microlens layer 14 are composed of tens, hundreds, or even thousands of circular convex microlenses, respectively. The micro lenses are arranged in a hexagonal structure plane array, and the angle between the circle centers is 60 degrees. The hexagonal arrangement is the most dense arrangement, which can provide the maximum projection area unit and can utilize the light of the luminous source to the maximum extent by the most dense arrangement, thereby improving the optical efficiency.

Further, each of the first microlens unit 121 and each of the second microlens unit 141 correspond to one of the micropattern units 131, that is, several tens, several hundreds, or even several thousands of different micropatterns are sandwiched between two microlens arrays. Most micropatterns are only a portion thereof, as compared to the complete pattern illuminated on the imaging surface.

For an oblique imaging plane not perpendicular to the optical axis, the oblique imaging plane is generally inclined towards the bottom plane by 12 °, and the implementation is that more light transmission of the micro-pattern is set for displaying content at the farther part of the imaging plane, and less light transmission of the micro-pattern is set for displaying content at the closer part of the imaging plane. As shown in fig. 3, the light-transmitting area is an area indicated by a cut-off line in the micro-pattern unit 131, the light-transmitting area is formed with micro-patterns, a light-shielding area is disposed around the periphery of the light-transmitting area, different cut-off lines indicate that the micro-patterns on the 4 micro-pattern units are different or not identical in shape, and after the angle between the parallel light emitted from the second micro-lens unit 141 and the imaging plane and the size of the imaged image are determined, it can be determined how much each micro-pattern in the micro-pattern array occupies the complete pattern according to the energy difference of the light beam irradiating different positions on the imaging plane. The arrangement of these different micropatterns may be random, without order and positional requirements. Thus, when the patterns are obliquely projected, more projected images are overlapped on the distant patterns, so that the phenomenon of weak light at a long distance is compensated.

Referring to fig. 4, in a second aspect, an embodiment of the present application discloses a microlens array projection apparatus 100, where the microlens array projection apparatus 100 includes a light source 2, a light uniformizing lens group 3 and a microlens array substrate 1, the light uniformizing lens group 3 is disposed between the light source 2 and the microlens array substrate 1, and light of the light source 2 passes through the light uniformizing lens group 3 and the microlens array substrate 1 in sequence to be projected on an image plane. The dodging mirror group 3 collimates the light emitted by the luminous source 2.

Referring to fig. 5, in a third aspect, the present embodiment discloses a vehicle 1000, where the vehicle 1000 includes a main body portion 200 and the microlens array projection apparatus 100 of the second aspect, and the microlens array projection apparatus 100 is disposed on the main body portion 200.

Illustratively, due to the thin and light property of the projection apparatus 100, it is able to integrate a plurality of projection apparatuses 100 in the limited space of the main body 200, and project various projection patterns by controlling the brightness of each module, respectively, so as to realize dynamic projection illumination control according to time sequence.

Illustratively, the vehicle 1000 is an automobile, an electric vehicle, or a bicycle. The microlens array projection apparatus 100 of the present embodiment can be used as a courtesy light, a ground direction light, and a ground braking distance warning light of the vehicle 1000.

As an alternative embodiment, the vehicle 1000 is an automobile, and the body portion 200 may be an automobile door or an automobile chassis.

The embodiment of the utility model provides a vehicle 1000, microlens array projection arrangement 100's volume is less, can reduce the space that microlens array projection arrangement 100 occupy the vehicle, reduces the volume and the weight of vehicle.

The above detailed description has been made on a microlens array substrate, a microlens array projection apparatus and a vehicle disclosed in the embodiments of the present invention, and specific examples are applied herein to explain the principles and embodiments of the present invention, and the description of the above embodiments is only used to help understand the microlens array substrate, the microlens array projection apparatus and the vehicle of the present invention and their core ideas; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, and in summary, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A microlens array substrate, comprising:

the substrate layer is provided with a first surface and a second surface which are arranged oppositely;

a pattern layer disposed on the first surface, the pattern layer including micropattern units;

the first micro-lens layer is arranged on one side, away from the first surface, of the pattern layer and comprises first micro-lens units, and the first micro-lens units are arranged corresponding to the micro-pattern units;

the light shielding layer is arranged on the second surface and comprises a hollowed-out unit, and the hollowed-out unit is arranged corresponding to the micro-pattern unit; and

the second micro-lens layer is arranged on one side, away from the second surface, of the light shielding layer and comprises second micro-lens units, and the second micro-lens units are arranged corresponding to the hollow-out units.

2. The microlens array substrate of claim 1, wherein the first surface of the substrate layer is configured to be disposed toward a light emitting source.

3. The microlens array substrate of claim 1, wherein the first microlens layer includes a plurality of the first microlens units arranged in an array, the pattern layer includes a plurality of the micropattern units arranged in an array, each of the first microlens units is disposed in one-to-one correspondence with each of the micropattern units, the second microlens layer includes a plurality of the second microlens units arranged in an array, each of the second microlens units corresponds to each of the first microlens units in one-to-one correspondence, the light shielding layer includes a plurality of the hollow units arranged in an array, and each of the second microlens units corresponds to each of the hollow units in one-to-one correspondence.

4. The substrate of claim 3, wherein the projection of the hollow unit along the direction perpendicular to the first surface is located on the stop of the corresponding first microlens unit.

5. A microlens array substrate according to claim 3, wherein the second microlens unit has a focal point in a direction perpendicular to the second surface on the corresponding micropattern unit.

6. The microlens array substrate of claim 3, wherein the micropattern unit comprises a light-transmissive region and a light-shielding region disposed around the light-transmissive region, the light-transmissive region is formed with micropatterns, and the micropatterns on the individual micropattern units are different or not identical in shape, so that imaging on an imaging plane not perpendicular to the optical axis is clear and uniform in near-far brightness is maintained.

7. The microlens array substrate according to any one of claims 1 to 6, wherein the pattern layer and the second microlens layer constitute an optical system having a focal length of 0.1mm to 3 mm.

8. The microlens array substrate of claim 7, wherein the optical system satisfies the conditional expression: TTL/ImgH is more than or equal to 1 and less than or equal to 10, wherein TTL is the distance between the surface of the light inlet side of the micro pattern unit and the surface of the light outlet side of the second micro lens unit on the optical axis, and Imgh is half of the height of the maximum field angle corresponding image of the optical system.

9. The micro-lens array substrate of claim 7, wherein the first micro-lens unit includes a first light incident surface and a first light emitting surface opposite to each other, the first light emitting surface is disposed on a side of the pattern layer away from the first surface, the first light incident surface is a convex arc surface, a distance from a vertex of the first light incident surface to the first light emitting surface is between 15um and 200um along an optical axis direction of the first micro-lens unit, and/or,

the second microlens unit includes relative second income plain noodles and second play plain noodles, the second income plain noodles is located deviating from of light shield layer one side of second surface, the second goes out the plain noodles and is the convex cambered surface, follows on the optical axis direction of second microlens unit, the second goes out the summit of plain noodles extremely the distance that the second goes into the plain noodles is between 15um-200 um.

10. A micro-lens array projection device, comprising a light source, a light uniformizing lens assembly and the micro-lens array substrate as claimed in any one of claims 1 to 9, wherein the light uniformizing lens assembly is disposed between the light source and the micro-lens array substrate.

11. A vehicle comprising a vehicle body and the microlens array projection apparatus of claim 10, wherein the microlens array projection apparatus is provided on the vehicle body.