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

Abstract

The utility model discloses a microlens array substrate, a microlens array projection device and a vehicle. The microlens array substrate includes a base material layer, a pattern layer, a first microlens layer, a light shielding layer and a second microlens layer. The base material layer has a first surface and a second surface arranged opposite to each other, the pattern layer is arranged on the first surface, the first microlens layer is arranged on the side of the pattern layer away from the first surface, and the light shielding layer is arranged on the second surface and the second microlens layer is disposed on the side of the light shielding layer away from the second surface. The utility model can realize thin and miniaturized design of the micro-lens array substrate, so that when the micro-lens array substrate is applied to the micro-lens array projection device, the space occupation of the micro-lens array projection device can be reduced, thereby making the micro-lens array The projection device can also be miniaturized.

Description

Microlens array substrate, microlens array projection device and vehicle

technical field

The utility model relates to the technical field of optical imaging, in particular to a microlens array substrate, a microlens array projection device and a vehicle.

Background technique

Projection technology is widely used in image display, welcome lighting, stage lighting and other fields. The related art projection device includes a light source, a film, and a projection lens, wherein the light source is used to emit light, the projection lens includes a plurality of lenses arranged in sequence along the light exit direction, and the projection lens is used to amplify the pattern image of the film. projected to the front. However, the above-mentioned projection lens takes up a lot of space due to the larger size of the lens, resulting in a larger overall size of the projection lens, which in turn results in a larger volume of the projection device.

Utility model content

The utility model discloses a microlens array substrate, a microlens array projection device and a vehicle, which make the microlens array substrate thin and miniaturized.

In order to achieve the above purpose, the utility model discloses a microlens array substrate, comprising: a base material layer, which has a first surface and a second surface arranged opposite to each other; and a pattern layer, the pattern layer is arranged on the first surface above, the pattern layer includes a micro-pattern unit; a first micro-lens layer, the first micro-lens layer is provided on the side of the pattern layer away from the first surface, and the first micro-lens layer includes a first micro-lens layer. a micro-lens unit, the first micro-lens unit is disposed corresponding to the micro-pattern unit; a light-shielding layer, the light-shielding layer is disposed on the second surface, the light-shielding layer includes a hollow unit, the hollow unit and the the micro-pattern units are correspondingly arranged; and a second micro-lens layer, the second micro-lens layer is arranged on the side of the light shielding layer away from the second surface, and the second micro-lens layer includes a second micro-lens unit, and the second microlens unit is disposed corresponding to the hollow unit.

In the above-mentioned microlens array substrate, the first microlens layer and the second microlens layer are respectively arranged on opposite sides of the base material layer, while the pattern layer is arranged between the first microlens layer and the base material layer, and the light shielding layer is arranged. It is arranged between the base material layer and the second microlens layer, so that the first microlens layer, the pattern layer, the light shielding layer and the second microlens layer are integrated on the base material layer, so that the microlens array substrate can be thinned Therefore, when the microlens array substrate is applied to the microlens array projection device, the space occupation of the microlens array projection device can be reduced, so that the microlens array projection device can also realize the miniaturization design.

As an optional implementation manner, the first surface of the base material layer is configured to face the light-emitting source. Since the first microlens layer is disposed on the first surface, the light emitted by the light-emitting source first passes through the first microlens layer, and the first microlens layer can realize uniform light and then project it to the pattern layer, effectively improving the microlens array. Optical uniformity of the substrate.

As an optional implementation manner, the first microlens layer includes a plurality of the first microlens units arranged in an array, and the pattern layer includes a plurality of the micropattern units arranged in an array, Each of the first micro-lens units is arranged in a one-to-one correspondence with each of the micro-pattern units, the second micro-lens layer includes a plurality of the second micro-lens units arranged in an array, and each second micro-lens unit One-to-one correspondence with each of the first micro-lens units, the light shielding layer includes a plurality of the hollowed-out units arranged in an array, and each of the second micro-lens units is in a one-to-one correspondence with each of the hollowed-out units.

The incident light passes through the first microlens layer, the pattern layer, the base material layer, the light shielding layer and the second microlens layer in sequence respectively. The plurality of first micro-lens units divide the incident light into multiple beams of light, and each first micro-lens unit projects the divided light to the corresponding micro-pattern unit respectively, and after the micro-pattern is formed by the micro-pattern unit, it is projected to the corresponding micro-pattern unit. Hollow unit, the hollow unit blocks the stray light in the light and then projects it to the corresponding second micro-lens unit. When multiple second micro-lens units are projected from different positions and angles at the same time, images will be superimposed before and after the focal length. images with improved clarity. It can be seen that, by using the microlens array substrate of the present application, the volume of the microlens array substrate is effectively reduced on the basis of ensuring the imaging effect through the design of the above-mentioned microunits.

As an optional implementation manner, the projection of the hollow unit in a direction perpendicular to the first surface is located on the corresponding aperture of the first microlens unit.

By arranging a diaphragm in the first micro-lens unit, the light emitted from the light-emitting source is cut through the diaphragm of each first micro-lens unit, divided into a plurality of beams and projected to the corresponding micro-pattern unit. The projection in the direction of the first surface is located on the corresponding diaphragm, and all the light rays can be projected to the target irradiation surface through the second lens layer unit, and the light transmission efficiency is high. At the same time, the hollow structure can block stray light with a large incident angle, thereby improving the optical efficiency and optical uniformity.

As an optional implementation manner, a focal point of the second microlens unit along a direction perpendicular to the second surface is located on the corresponding micropattern unit. In this way, when the microlens array substrate is applied to a microlens array projection device, or even to a vehicle, through the above design, the superimposed image at the off-focus distance can be made clearer, that is, to make the superimposed image in a long range before and after the focus. The projected image can be very clear, thus realizing a large-area, clear, and even-brightness oblique projection illumination.

The above-mentioned optical system can achieve the effect of a wider range of depth of focus, and a large-angle oblique projection can also be imaged into a clear pattern.

As an optional implementation manner, the pattern layer and the second microlens layer constitute an optical system, and the focal length of the optical system is between 0.1 mm and 3 mm; the optical system satisfies the conditional formula: 1≤TTL /ImgH≤10, wherein, TTL is the distance on the optical axis from the surface of the light-incident side of the micro-pattern unit to the surface of the light-emitting side of the second micro-lens unit, and Imgh is the image corresponding to the maximum angle of view of the optical system half of the height; the first microlens unit includes a first light incident surface and a first light exit surface opposite to each other, the first light exit surface is arranged on the side of the pattern layer away from the first surface, so The first light incident surface is a convex arc surface, and along the optical axis direction of the first microlens unit, the distance from the vertex of the first light incident surface to the first light exit surface is between 15um and 200um, And/or, the second microlens unit includes a second opposite light incident surface and a second light exit surface, the second light incident surface is provided on the side of the light shielding layer away from the second surface, so The second light emitting surface is a convex arc surface, and along the direction of the optical axis of the second microlens unit, the distance from the vertex of the second light emitting surface to the second light incident surface is between 15um and 200um. By limiting the optical system to meet the above range, the overall length of the optical system can be reasonably compressed on the basis of ensuring good imaging quality, which in turn is beneficial to compress the overall length of the microlens array substrate, thereby realizing the thinning and miniaturization of the microlens array substrate. design. At the same time, a wider range of focal depth can be achieved on the projected imaging surface, so that the projected image in a long range before and after the focus can be very clear, thereby realizing large-area, clear, and uniformly bright oblique projection illumination.

As an optional implementation manner, the micro-pattern unit includes a light-transmitting area and a light-shielding area arranged around the light-transmitting area, the light-transmitting area is formed with micro-patterns, and the micro-patterns on each of the micro-pattern units The shapes of the patterns are different or not exactly the same, so that the imaging on the imaging plane not perpendicular to the optical axis is clear and the brightness of far and near is kept consistent.

In the micropattern unit, only part of the micropattern is light-transmitting, and other parts are opaque, and each micropattern in the micropattern unit is different. The corresponding first microlens unit and the corresponding second microlens unit respectively correspond to the same micropattern. Most micropatterns are only a fraction of the full pattern illuminated on the imaging surface. By adjusting the shapes of the micropatterns on different micropattern units, more light beams can be irradiated to places farther from the imaging surface, while fewer light beams can be irradiated to places closer to the imaging surface. In this way, the problem that the far distance is darker than the near one can be avoided, and the pattern brightness on the imaging surface can be evenly distributed, so that the near and far imaging sharpness is close to or even the same.

The present invention provides a microlens array projection device, comprising a light source, a homogenizing mirror group and the above-mentioned microlens array substrate, wherein the homogenizing mirror group is arranged between the light source and the microlens array substrate. In the present application, due to the small volume and thinning of the microlens array substrate, the volume of the microlens array projection device is also small and thin.

The present invention provides a vehicle including a main body and the above-mentioned microlens array substrate. In the present application, because the microlens array substrate is small and thin, the microlens array projection device is also small and thin.

Compared with the prior art, the beneficial effects of the present utility model are:

In the above-mentioned microlens array substrate, the first microlens layer and the second microlens layer are respectively arranged on opposite sides of the base material layer, while the pattern layer is arranged between the first microlens layer and the base material layer, and the light shielding layer is arranged. It is arranged between the base material layer and the second microlens layer, so that the first microlens layer, the pattern layer, the light shielding layer and the second microlens layer are integrated on the base material layer, so that the microlens array substrate can be thinned Therefore, when the microlens array substrate is applied to the microlens array projection device, the space occupation of the microlens array projection device can be reduced, so that the microlens array projection device can also realize the miniaturization design.

Description of drawings

In order to illustrate the technical solutions in 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 based on these drawings without any creative effort.

1 is a schematic structural diagram of a microlens array substrate disclosed in an embodiment of the present invention;

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

3 is an example of the design of the micro-pattern units arranged in an array disclosed in the embodiment of the present invention;

4 is a schematic structural diagram of a microlens array projection device disclosed in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present invention.

Description of main reference signs:

1. Micro-lens array substrate; 11. Base material layer; 12. First micro-lens layer; 121, First micro-lens unit; 13. Pattern layer; 131, Micro-pattern unit; 14. Second micro-lens layer; 141, 2nd microlens unit; 15, shading layer; 151, hollow unit; m, central axis; 111, first surface; 112, second surface; 2, light source; 3, uniform mirror group; 100, microlens array Projection device; 200, main body part; 1000, vehicle.

Detailed ways

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

In this utility model, the terms "up", "down", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle" The orientations or positional relationships indicated by , "vertical", "horizontal", "horizontal", "longitudinal", etc. are based on the orientations or positional relationships shown in the drawings. These terms are primarily used to better describe the present invention and its embodiments, and are not intended to limit the fact that the indicated device, element or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

Furthermore, the terms "installed", "arranged", "provided", "connected", "connected" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or a unitary structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and configurations may be the same or different), and are not used to indicate or imply the indicated devices, elements, etc. or the relative importance and number of components. Unless stated otherwise, "plurality" means two or more.

The technical solutions of the present utility model will be further described below with reference to the embodiments and the accompanying drawings.

Referring to FIG. 1 , a first aspect of an embodiment of the present application provides a microlens array substrate 1 , and the microlens array substrate 1 can be applied to a microlens array projection device 100 , so that the microlens array projection device 100 can be applied to For example, in vehicles and electronic products, and then realize projection lighting. For example, when the microlens array projection device 100 is applied to a vehicle, the microlens array projection device 100 can be used as a welcome light, a ground direction light, a ground braking distance warning light, etc. for projecting lighting on the ground. Specifically, the microlens array substrate 1 at least includes 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 base material layer 11 has a first surface 111 and a second surface 112 disposed opposite to each other. The pattern layer 13 is disposed on the first surface 111 , and the pattern layer 13 includes micro-pattern units 131 . The first microlens layer 12 is disposed on the 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 is disposed corresponding to the micro-pattern unit 131 . The second microlens layer 14 is disposed on the 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 is disposed corresponding to the hollow unit 151 .

The above-mentioned microlens array substrate 1 is formed by disposing the first microlens layer 12 and the second microlens layer 14 on opposite sides of the base material layer 11 respectively, and at the same time making the pattern layer 13 disposed on the first microlens layer 12 and the base material. Between the layers 11, the light shielding layer 15 is provided between the base material 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 into the base material. Therefore, when the microlens array substrate 1 is applied to the microlens array projection device 100, the space for the microlens array projection device 100 can be reduced. occupancy, so that the microlens array projection device 100 can also achieve a miniaturized design.

In some embodiments, the substrate layer 11 may be a light-transmitting substrate, such as a glass substrate or a plastic substrate, which is not specifically limited in this embodiment. Exemplarily, the substrate layer 11 can 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 , the light shielding layer 15 and the second microlens layer 14 When disposed on the second surface 112 of the base material layer 11 , since the base material layer 11 is a transparent material, it will not affect the incidence and output of light, thereby improving the accuracy of projecting patterns on the ground and ensuring imaging quality.

In some embodiments, the first surface 111 of the base material layer 11 is configured to face the light-emitting source 2 . Since the first microlens layer 12 is disposed on the first surface 111 , the light emitted by the light-emitting source 2 first passes through the first microlens layer 12 . , the use of the first microlens layer 12 can realize uniform light 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 base material layer 11 , a chrome plating layer or a black glue layer can be used on the base material layer 11 . On the first surface 111 and the second surface 112 , the chrome layer or the black glue layer is removed by laser direct writing or developing etching, so as to form the pattern layer 13 and the light shielding layer 15 . Then, the first microlens layer 12 is processed on the surface of the pattern layer 13 by imprinting or reflow method, and correspondingly, the second microlens layer 14 is processed on the surface of the light shielding layer 15 , thereby forming the microarray lens 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, and each of the first microlens units 131 is arranged in an array. The lens units 121 are in one-to-one correspondence with each of the micro-pattern units 131 , and the second micro-lens layer 14 includes a plurality of second micro-lens units 141 arranged in an array. The microlens units 121 are in one-to-one correspondence, the light shielding layer 15 includes a plurality of hollow units 151 arranged in an array, and each of the second micro-lens units 141 is in a one-to-one correspondence with each of the hollow units 151 . That is, the number of the first micro-lens units 121 , the number of the micro-pattern units 131 , the number of the hollow units 151 and the number of the second micro-lens units 141 are in one-to-one correspondence.

It is worth noting that the one-to-one correspondence between the first microlens unit 121 and the micropattern unit 131 mainly refers to the correspondence in position and in quantity, and the correspondence in position includes complete correspondence and partial correspondence.

The incident light passes 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 sequence. The plurality of first micro-lens units 121 divide the incident light into multiple beams of light, and each first micro-lens unit 121 projects the divided light to the corresponding micro-pattern unit 131 respectively. After the micro-pattern unit 131 forms a micro-pattern, Projecting to the corresponding hollow unit 151, the hollow unit 151 blocks the stray light in the light and then projects it to the corresponding second micro-lens unit 141. When a plurality of second micro-lens units 141 are simultaneously projected and imaged from different positions and angles, the focal length is different. The front and back images are superimposed, and the superimposed images improve sharpness. By adopting the microlens array substrate 1 of the present application, the volume of the microlens array substrate 1 is effectively reduced on the basis of ensuring the imaging effect through the design of the above-mentioned micro-units.

It can be understood that, in other embodiments, the number of the first micro-lens units 121, the number of the micro-pattern units 131, the number of the hollow units 151, and the number of the second micro-lens units 141 may not be in one-to-one correspondence. The number of one micro-lens unit 121 may be larger or smaller than the number of micro-pattern units 131 , and the number of hollow units 151 may also be larger or smaller than that of the second micro-lens unit 141 .

Referring to FIG. 2 , in some embodiments, the first microlens layer 12 is disposed on the first surface 111 of the base material layer 11 , and the first microlens layer 12 includes a plurality of first microlens units 121 arranged in an array. A diaphragm is provided on the first microlens unit 121 , and the light emitted from the light source 2 is cut through the diaphragm of each first microlens unit 121 , and divided into a plurality of beams and projected to the corresponding micropattern unit 131 . The light shielding layer 15 is disposed on the second surface 112 of the base material 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 marks the area of the cross-section line in FIG. 2 , the light-shielding area, and the unshielded area forms the hollow unit 151 . In the direction perpendicular to the first surface 111 , the center of the hollow unit 151 corresponds to the corresponding first The centers of the micro-lens units 121 are coincident. As shown by the central axis m, the hollow unit 151 is located on the corresponding aperture on the first micro-lens unit 121 along the projection in the direction perpendicular to the first surface 111 . . All the light 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 project to the corresponding second microlens unit 141 for focused imaging. Therefore, in the structure of the light shielding layer 15, the stray light with a large incident angle can be shielded by each hollow unit 151, thereby improving the consistency of the clarity of the image formed after being projected to the second microlens unit 141, and effectively improving the microlens array. Imaging effect of the substrate.

Exemplarily, as shown in FIG. 2 , L1 is vertical light, and L2 is non-vertical light. The vertical light refers to the light perpendicular to the first light incident surface of the first microlens unit 121 , otherwise it is 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 incident light. The greater the refraction loss of the incident light after entering the first microlens unit 121 is. L2 is the light with the largest incident angle that can enter the first microlens unit 121 , that is, the hollow unit 151 can block the stray light with the incident angle greater than a, that is, block the light with lower clarity after incident imaging, and the incident angle is smaller than a The clarity of the incident image of the incident light is all greater than or equal to the clarity of the incident image of the incident light L2, so as to improve the consistency of the image clarity projected to the second micro-lens unit 141 and improve the light-gathering efficiency of the second micro-lens unit 141 , so as to improve the imaging effect.

In some embodiments, the focal point of the second micro-lens unit 141 along the direction perpendicular to the second surface 112 is located on the corresponding micro-pattern unit 131 . In this way, when the microlens array substrate 1 is applied to the microlens array projection device 100 or even the vehicle 1000 , the superimposed image at the off-focus distance can be made clearer through the above-mentioned design, that is, the superimposed image can be made very long before and after the focus. The projected images within the range can be very clear, thus realizing large-area, clear, and evenly-bright oblique projection illumination.

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 0.1 mm and 3 mm. By limiting the focal length of the optical system to meet the above range, it is possible to reasonably compress the focal length of the optical system on the basis of ensuring good imaging quality, which in turn is beneficial to compress the total length of the microlens array substrate 1 and realize the thinness of the microlens array substrate 1 Miniaturized and miniaturized design.

In a specific embodiment, the optical system satisfies the conditional formula: 1≤TTL/ImgH≤10, wherein, TTL is the surface of the light-incident side of the micro-pattern unit 131 to the light-exit side surface of the second micro-lens unit 141 The distance on the optical axis, Imgh is half of the image height corresponding to the maximum angle of view of the optical system. When the optical system satisfies the above conditional expression, the total length of the optical system can be effectively compressed, which is beneficial to compress the total length of the microlens array substrate 1 . The thin and miniaturized design of the microlens array substrate 1 can be realized, and at the same time, the microlens array substrate 1 can have a sufficient imaging size to increase the relative illuminance, thereby helping to improve the imaging quality of the microlens array substrate 1 .

In a specific embodiment, the first micro-lens unit 121 includes a first light incident surface and a first light exit surface opposite to each other, and the first light exit surface is disposed on a side of the pattern layer 13 away from the first surface 111 . side, the first light incident surface is a convex arc surface, along the optical axis direction of the first microlens unit 121, the distance from the vertex of the first light incident surface to the first light exit surface is 15um- 200um, and/or,

The second microlens unit 141 includes a second light incident surface and a second light exit surface opposite to each other, the second light incident surface is disposed on the side of the light shielding layer 15 away from the second surface 112 , the The second light emitting surface is a convex arc surface, and along the direction of the optical axis of the second microlens unit 141 , the distance from the vertex of the second light emitting surface to the second light incident surface is between 15um and 200um.

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

When the optical system satisfies the above conditional expression, the total length of the optical system can be effectively compressed, which is beneficial to compress the total length of the microlens array substrate 1 .

Considering that the pattern layer 13 and the second micro-lens layer 14 together form an optical system, the following will illustrate the relevant parameters of the optical system with reference to examples.

In the first example, the light exit surface of the second microlens unit 141 is a convex surface at the near optical axis. The effective focal length of the optical system is f=2.08mm, the aperture number of the optical system is FNO=2.50, and the TTL/ImgH of the optical system is 8.17.

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

Table 1a

face number surface name surface type Y radius thickness refractive index Abbe number focal length object plane spherical unlimited 3.000 1.517 64.2 S1 object side spherical unlimited 0.105 1.515 54.3 2.08488 S2 like the side Aspherical -0.931 1500 image plane spherical unlimited

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

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table The reciprocal of the Y radius R in 1a); K is the conic coefficient; Ai is the correction coefficient corresponding to the higher-order term of the i-th term of the aspheric surface. Table 1b gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspheric mirror surfaces S1-S14 in the first embodiment.

Table 1b

In the second example, the light exit surface of the second microlens unit 141 is a convex surface at the near optical axis. The effective focal length of the optical system is f=2.00mm, the aperture number of the optical system is FNO=2.73, and the TTL/ImgH of the optical system is 8.24.

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

Table 2a

face number surface name surface type Y radius thickness refractive index Abbe number focal length object plane spherical unlimited 3.200 1.517 64.2 S1 object side spherical unlimited 0.097 1.515 54.3 2.00549 S2 like the side Aspherical -1.037 1000 image plane spherical unlimited

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

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table 2a is the reciprocal of the Y radius R); K is the conic coefficient; Ai is the correction coefficient corresponding to the higher-order term of the i-th term of the aspheric surface. Table 2b gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspheric mirror surfaces S1-S14 in the first embodiment.

Table 2b

In the third example, the light exit surface of the second microlens unit 141 is a convex surface at the near optical axis. The effective focal length of the optical system is f=2.08mm, the aperture number of the optical system is FNO=2.5, and the TTL/ImgH of the optical system is 7.76.

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

Table 3a

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

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table 3a, the reciprocal of the Y radius R); K is the conic coefficient; Ai is the correction coefficient corresponding to the higher-order term of the i-th term of the aspheric surface. Table 3b gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspheric mirror surfaces S1-S14 in the first embodiment.

Table 3b

All of the above three embodiments can achieve good projection imaging quality, and the microlens array substrate 1 can be thinned. By limiting the optical system to meet the above-mentioned range, the overall length of the optical system can be reasonably compressed on the basis of ensuring good imaging quality, which in turn is beneficial to compress the overall length of the microlens array substrate, thereby realizing the thinning and miniaturization of the microlens array substrate. Design. At the same time, a wider range of focal depth can be achieved on the projected imaging surface, so that the projected image in a long range before and after the focal point can be very clear, thereby realizing large-area, clear, and evenly bright oblique projection illumination.

In some embodiments, the micro-pattern unit 131 includes a light-transmitting area and a light-shielding area arranged around the light-transmitting area. The shapes of the micropatterns on each micropattern unit 131 are different or not completely the same, so that the imaging on the imaging plane not perpendicular to the optical axis is clear and the brightness of far and near is consistent.

In some embodiments, the first microlens layer 12 and the second microlens layer 14 are respectively composed of dozens, hundreds or even thousands of circular convex microlenses. The microlenses are arranged in a flat array of hexagonal structures, and the angle between the centers of the circles is 60 degrees. The hexagonal arrangement is the densest arrangement, which can provide the largest projection area unit, and can maximize the utilization of the light of the light source in the densest arrangement to improve the optical efficiency.

Further, each first microlens unit 121 and each second microlens unit 141 corresponds to one micropattern unit 131, that is to say, dozens, hundreds or even thousands of different microlens arrays are sandwiched between the two microlens arrays. micropattern. Most micropatterns are only a fraction of the full pattern illuminated on the imaging surface.

For the inclined imaging surface that is not perpendicular to the optical axis, it is usually inclined toward the bottom surface by 12°. Specifically, the display content is more farther away from the imaging surface, and the light transmission settings of the micropattern are more, and the content is displayed closer to the imaging surface. There are fewer light-transmitting settings in the micropattern. As shown in FIG. 3 , the light-transmitting area is the area shown by the cross-section line in the micro-pattern unit 131 , the light-transmitting area is formed with a micro-pattern, and the light-shielding area is arranged around the periphery of the light-transmitting area, and the different cross-section lines represent 4 The shapes of the micro-patterns on each of the micro-pattern units are different or not exactly the same. After the angle of the parallel light emitted from the second micro-lens unit 141 and the imaging plane and the size of the imaging image are determined, the beams can be irradiated to different positions on the imaging plane according to the size of the imaging plane. energy difference to determine what fraction of the full pattern each micropattern in the micropattern array represents. The arrangement of these different micropatterns can be random, with no order and position requirements. In this way, when projected obliquely, the pattern at a distance has more overlap of the projected image, thereby compensating for the phenomenon of weak light at a distance.

Referring to FIG. 4 , in a second aspect, an embodiment of the present application discloses a microlens array projection device 100 . The microlens array projection device 100 includes a light source 2 , a homogenizing mirror group 3 , and a microlens array substrate 1 . The homogenizing mirror group 3 is arranged between the light source 2 and the microlens array substrate 1, and the light of the light source 2 is projected on the imaging surface through the homogenizing mirror group 3 and the microlens array substrate 1 in sequence. The homogenizing mirror group 3 collimates the light emitted by the light source 2 .

Referring to FIG. 5 , in a third aspect, an embodiment of the present application discloses a vehicle 1000 , the vehicle 1000 includes a main body part 200 and the microlens array projection device 100 of the second aspect, the microlens array projection device 100 is provided on the main body part 200.

Exemplarily, due to the light and thin characteristics of the micro-lens array projection device 100, it can be used to integrate multiple micro-lens array projection devices 100 in the limited space of the main body part 200. To achieve timing control of dynamic projection lighting.

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

As an optional embodiment, if the vehicle 1000 is an automobile, the main body portion 200 may be an automobile door or an automobile chassis.

The embodiment of the present invention provides a vehicle 1000. The microlens array projection device 100 has a small volume, which can reduce the space occupied by the microlens array projection device 100 in the vehicle and reduce the volume and weight of the vehicle.

A micro-lens array substrate, a micro-lens array projection device and a vehicle disclosed in the embodiments of the present utility model have been described above in detail. Specific examples are used in this paper to illustrate the principles and implementations of the present utility model. The description is only used to help understand a microlens array substrate, a microlens array projection device, a vehicle and its core idea of the present invention; There will be changes in the scope of application and application. To sum up, the contents of this specification should not be construed as a limitation to the present invention.

Claims (11)

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.

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