CN114071098A

CN114071098A - Projection system and projection method thereof

Info

Publication number: CN114071098A
Application number: CN202010755933.7A
Authority: CN
Inventors: 李�浩; 郎海涛; 杨佳; 张恩鑫; 荣文秀
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2022-02-18

Abstract

The present application provides a projection system comprising: the light source module is used for emitting light carrying display information; and a projection lens module disposed on a light path of the light emitted from the light source module and including at least one lens to modulate the light emitted from the light source module. Also, the projection system further comprises at least one light trim element. The plurality of light trimming units include: a substrate; and a microlens array formed on the substrate and composed of a plurality of microlenses, for performing a refraction process on the light incident to the microlens array, thereby finely adjusting an exit angle of the light incident to the microlens array. The projection system can effectively improve the color edge problem of the projected image, so that the illumination of the projected image is more uniform.

Description

Projection system and projection method thereof

Technical Field

The present disclosure relates to the field of optical devices, and more particularly, to a projection system and a projection method thereof.

Background

With the development of the automobile lighting technology, the automobile headlamp develops from the traditional lighting direction to the direction of considering the ground projection. On one hand, the projection type automobile headlamp can provide ground projection prompting marks for night driving, such as steering prompting and obstacle prompting lamps; on the other hand, warning signs and the like can be displayed for other vehicles and pedestrians participating in traffic.

However, the currently mainstream projection type automobile headlamp generally has the problems that a projected image has a serious color edge and the projected image is not uniform, mainly because the projected light consists of lights with different wavelengths, and the refractive indexes of the lights with different wavelengths are different, so that the projection lens has chromatic aberration, and the projected image forms a color edge. The projection lens module and the light source module included in the automobile headlamp are all causes that color fringes appear on a projected image and the illumination of the projected image is not uniform.

At present, a micro lens is generally arranged on the lens surface closest to the light emitting side of the projection lens module to improve the color margin and uniformity of a projected image; however, the surface of the lens is curved, and the requirement for processing ability is relatively high when the micro lens is prepared on the curved surface, so that the lens with the micro lens with small size and high precision is difficult to prepare in practical application. At present, an automobile headlamp projection system which can effectively improve the color margin and uniformity of a projected image and is easy to process is urgently needed.

Disclosure of Invention

The present application provides a projection system that addresses at least some of the above-identified deficiencies in the prior art.

One aspect of the present application provides a projection system, comprising: the light source module is used for emitting light carrying display information; and a projection lens module disposed on a light path of the light emitted from the light source module and including at least one lens to modulate the light; the projection system further comprises at least one light trimming element comprising: a substrate; and a microlens array composed of a plurality of microlenses on the substrate, for performing a refraction process on the light, thereby finely adjusting an exit angle of the light.

According to an embodiment of the application, the light trimming element is arranged inside the projection lens module or outside the projection lens module.

According to an embodiment of the application, the light trim element is arranged inside the projection lens module and adjacent to the lens closest to the light exit side of the projection lens module.

According to an embodiment of the application, the light trim element is arranged outside the projection module adjacent to the light exit side of the projection lens module.

According to an embodiment of the present application, the substrate has a front surface facing the incident direction of the light and a rear surface opposite to the front surface, and the microlens array is disposed on a disposition surface of the substrate, the disposition surface being at least one of the front surface and the rear surface.

According to an embodiment of the present application, the microlens array protrudes from the setting surface.

According to the embodiment of the application, the micro lens array is recessed on the setting surface.

According to an embodiment of the present application, the microlens has a curved surface away from the setting surface, and an outline of the curved surface is at least one of a circle, a rectangle, and a regular polygon.

According to the embodiment of the present application, the thickness h of the microlens satisfies: h is more than or equal to 0.5 mu m and less than or equal to 100 mu m.

According to the embodiment of the application, the numerical range of the circumscribed circle diameter d of the curved surface is 0.2mm to 2 mm.

According to the embodiment of the application, the diameter d of the circumscribed circle of the curved surface and the thickness h of the micro-lens satisfy: h/d is more than or equal to 0.05 percent and less than or equal to 5 percent.

According to an embodiment of the present application, the surface shape of the microlens is at least one of a spherical surface, an aspherical surface, and a free-form surface.

According to an embodiment of the present application, the microlens is made of one of a plastic material, a glass material, and a PET material.

According to an embodiment of the present application, the light source module includes an image generation unit, and the image generation unit is at least one of a matrix LED, a DMD chip, an LCOS module, and a TFT module.

According to an embodiment of the present application, the projection lens module includes a plurality of lenses, and the number of the lenses is 4, 5, or 6.

In another aspect, the present application further provides a method for manufacturing the projection system, where the method includes: preparing a light trimming element comprising a microlens array; disposing a projection lens module on a light path of light emitted from a light source module to modulate the light; and disposing the light trimming element in a light path of the light, wherein preparing the light trimming element including the microlens array includes: forming the microlens array including microlenses of different shape configurations on a substrate.

According to an embodiment of the present application, the substrate has a front surface facing the incident direction of the light and a rear surface opposite to the front surface, and the forming of the microlens array including the differently shaped configuration on the substrate includes: disposing the microlens array on a disposition surface of the substrate, the disposition surface being at least one surface of the front surface and the rear surface.

According to an embodiment of the present application, disposing the microlens array on the disposition surface of the substrate includes: the microlens array is disposed to protrude from the disposition surface. According to an embodiment of the present application, disposing the microlens array on the disposition surface of the substrate includes: the microlens array is disposed recessed in the disposition surface. According to an embodiment of the application, disposing the light trimming element on the light path comprises: the light trimming element is disposed inside the projection lens module or outside the projection module.

According to an embodiment of the application, disposing the light trimming element inside the projection lens module comprises: the light trimming element is disposed inside the projection lens module and adjacent to the lens closest to the light exit side of the projection module.

According to an embodiment of the application, disposing the light trimming element outside of the projection lens module comprises: the light trimming element is arranged outside the projection module and adjacent to the light exit side.

According to an embodiment of the application, the method further comprises: the surface shape of the micro lens is set to be at least one of a spherical surface, an aspherical surface and a free-form surface.

According to an embodiment of the application, the microlens has a curved surface remote from the setting surface, the method further comprising: the contour of the curved surface is set to be at least one of a circle, a rectangle, and a regular polygon.

According to the embodiment of the application, the numerical range of the direct d of the circumcircle of the curved surface of the micro lens is 0.2 mm-2 mm.

According to an embodiment of the present application, the light source module includes an image generation unit, and the image generation unit is configured as at least one of a matrix LED, a DMD chip, an LCOS module, and a TFT module.

According to at least one aspect of the projection system provided by the present application, at least one of the following advantages can be achieved:

1. the projection system outputs images with picture information by using the light source module, images are formed on the ground by using the projection lens module, and the light fine adjustment element comprising the micro-lens array in the projection system performs angle fine adjustment on the imaging light, so that the color edge of the edge of a projected image and the integral uniformity of the projected image are effectively improved;

2. compared with the traditional method for arranging the micro lens on the surface of the lens in the projection lens module, the method has the advantages that the light fine adjustment element comprising the micro lens array is added into the projection system, and the method has the characteristics of low cost, easiness in processing, color edge improvement, remarkable uniformity effect and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of a projection system according to an embodiment of the present application;

FIG. 2A is a schematic diagram of a structure of a microlens array prominently disposed on a substrate and an enlarged structural view of a single microlens in the microlens array, according to one embodiment of the present application;

FIG. 2B is a schematic diagram of a structure of a microlens array in which recesses are provided in a substrate and an enlarged structural view of a single microlens in the microlens array according to another embodiment of the present application;

FIGS. 3A-3C are respective partial top views of a microlens array according to one embodiment of the present application;

FIG. 4 is a schematic diagram of a projection system according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a projection system according to an embodiment of the present application;

FIGS. 6A-6E are schematic diagrams of a projection system according to another embodiment of the present application; and

fig. 7A to 7F are schematic structural diagrams of a projection system according to another embodiment of the present application, respectively.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first surface discussed below may also be referred to as the second surface without departing from the teachings of the present application. And vice versa.

In the drawings, the thickness, size and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.

It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the methods described herein are not necessarily limited to the order described, but can be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 is a schematic diagram of a projection system 1000 according to an embodiment of the present application. Fig. 2A is a schematic view of a structure of a microlens array prominently disposed on a substrate 1310 and an enlarged structural view of a single microlens 1330 in the microlens array according to an embodiment of the present application. Fig. 2B is a schematic structural diagram of a microlens array in which recesses are provided in a substrate 1310 and an enlarged structural diagram of a single microlens 1330 in the microlens array according to another embodiment of the present application.

As shown in fig. 1, 2A, and 2B, the projection system 1000 may include: a light source module 1100, a projection lens module 1200, and a light trimming component 1300.

The Light source module 1100 includes at least one image generating unit, which may be a matrix LED (Light-Emitting Diode), a DMD (Digital micro mirror Device) chip, an LCOS (Liquid Crystal on Silicon) module, a TFT (Thin Film Transistor) module, and the like. The light source module 1100 can be used for both illumination and projection of text and simple patterns. The light source module 1100 may further include a plurality of sets of light source driving control elements, and the plurality of sets of light source driving control elements may be further connected to the at least one image generating unit to perform illumination control and projection information control on the image generating unit, so that the light source module 1100 can emit light having both illumination and display information.

The projection lens module 1200 is an imaging lens group, and may include a plurality of lenses to improve aberration of the projection system 1000 and improve quality of the projected image. As shown in fig. 1, the projection lens module 1200 includes a plurality of lenses E1, E2, E3, and E4. Although only 4 lenses are shown in fig. 1, the number of lenses included in the projection module 1200 is not limited in the present application, and those skilled in the art can adopt an appropriate number of lenses to adapt to different application scenarios under the teaching of the present disclosure, for example, the number of lenses is selected to be 5 or 6. The projection lens module 1200 is disposed on the optical path of the light carrying display information emitted from the light source module 1100. When the light carrying the display information passes through the projection lens module 1200, the light is modulated by multiple refractions of the lenses E1 to E4 and then emitted from the projection lens module 1200, so as to form different signs required by the projection system 1000, and the signs are projected on a surface such as a projection screen, a projection surface, a front floor, and the like.

The emergent light of the projection system 1000 after being modulated has serious color fringes and uneven projected image in practical application.

In practical application, the projection system provided by the application can be applied to the fields of intelligent headlights, welcome lamps and the like. Furthermore, the projection system can be used as a headlamp source in a vehicle to be combined with an external sensing system, so that the vehicle can automatically feed back pedestrians, vehicles and even road conditions on the road while ensuring the active safety. The headlight source can project different images and digital information to the ground, for example, the headlight source projects a zebra pattern to the ground to communicate with pedestrians on the road and tell the pedestrians that the pedestrians can safely pass through the zebra pattern; or when the vehicle speed is too high, a danger warning is projected to the ground to inform the driver of safety. However, the currently mainstream projection type automobile headlamp generally has the problems that a projected image has serious color margin and the projected image is not uniform. A conventional solution is to provide a microlens on a lens surface closest to a light exit side thereof in a projection lens module to improve color fringes and uniformity of a projected image; however, since the surface of the lens is a curved surface, the requirement for the processing capability is relatively high when the micro lens is prepared on the curved surface, and the lens which meets the requirement of the projection type headlamp and is provided with the micro lens with small size and high precision is difficult to prepare in practical application.

To solve the above problem, the projection system 1000 provided according to the present application further includes a light-trimming component 1300 including a substrate 1310 and a micro-lens array formed on the substrate 1310, wherein the substrate 1310 may be, for example, a substantially flat substrate and formed of a transparent material or a translucent material. The microlens array includes a plurality of microlenses 1330 of different shapes, and further, a plurality of microlenses 1330 that are identical can be selected to form a microlens array. As shown in fig. 1, 2A and 2B. In other words, preparing light trim component 1300 that includes a microlens array may include: forming a flat substrate 1310 by a transparent material or a translucent material; and a microlens array including microlenses 1330 of different shape configurations is formed on the substrate 1310.

The light fine tuning element 1300 may be used to fold the light for projection, for example, to reflect and refract the light for projection, thereby fine tuning the exit angle of the light to improve the color fringes and uniformity of the projected image.

Forming a microlens array comprising differently shaped configured microlenses 1330 on a substrate 1310 can form the microlens array directly on the substrate 1310 by, for example, molding; the microlens array can also be formed by coating a transparent material such as glue on the substrate 1310 and then performing molding; microlens arrays can also be prepared on substrate 1310 by means such as printing or dropping. However, the method for forming the microlens array is not limited in the present application, and those skilled in the art can form the microlens array by other methods suitable and not described in the present application under the teaching of the present disclosure to adapt to different application scenarios.

The substrate 1310 has a substantially lens-like shape and has two opposite surfaces, namely a first surface and a second surface, when the light fine-tuning element 1300 is disposed on the optical path of the light emitted from the light source module 1100, the surface (e.g., the first surface) of the substrate 1310 facing the direction of the light incident on the light fine-tuning element 1300 is a front surface 1311, and the surface (e.g., the second surface) opposite to the front surface is a back surface 1312. The plurality of microlenses 1330 can be disposed on a disposition surface of the substrate 1310, which can be the front surface 1311, the back surface 1312, or both the front surface 1311 and the back surface 1312.

In the optical trimming element 1300, the microlens array may be a protrusion structure or a depression structure, i.e., the microlens array may be protrudingly disposed on the disposition surface of the substrate 1310; alternatively, the microlens array may be concavely disposed in the disposition surface of the substrate 1310.

In the case where the microlens array is protrudingly disposed on the disposition surface, the microlenses 1330 have a bottom surface connected to the substrate 1310 and a curved surface 1332 opposite to the bottom surface and distant from the disposition surface, the curved surface 1332 having an outline of at least one of a circle, a rectangle, and a regular polygon.

In the case where the microlens array is concavely provided in the setting surface, the microlenses 1330 have a curved surface 1332 recessed in the setting surface and away from the setting surface, and the contour of the curved surface 1332 may be at least one of a circle, a rectangle, and a regular polygon.

The curved surface profile of the microlens is not limited in this application, and those skilled in the art can adopt the outer profile of the microlens in any one of non-circular shape, rectangular shape and regular polygon shape, and other suitable shapes to suit different application scenarios under the teaching of the present disclosure.

The structure of the individual microlens 1330 after ten-fold (10:1) magnification at a and B, respectively, for the differently configured microstructure arrays is shown in fig. 2A and 2B. A perpendicular distance between a portion (T) of the curved surface 1332 of the microlens 1330 farthest from the disposing surface and the disposing surface may be defined as a thickness h of the microlens 1330, the thickness h of the microlens 1330 satisfying: h is more than or equal to 0.5 mu m and less than or equal to 100 mu m. In addition, in fig. 2A and 2B, the contour of the curved surface 1332 of the circular microlens is taken as an example, and the diameter d of the circle is the diameter d of the circumscribed circle of the curved surface 1332 of the single microlens 1330. The diameter d of the circumscribed circle of the curved surface 1332 of the individual microlens 1330 and the thickness h of the microlens 1330 may satisfy: h/d is more than or equal to 0.05 percent and less than or equal to 5 percent. h/d represents the adjustment range of the light-emitting angle of the light to be emitted by the projection system after passing through the light fine-tuning element, and the larger the ratio of h/d is, the larger the variation range of the light-emitting angle is. However, although fig. 2A and 2B illustrate the profile of the curved surface 1332 of a circular microlens, those skilled in the art will appreciate the lens thickness when the microlens 1330 has other shapes, given the teachings of the present disclosure. Further, the microlens array provided herein may also be comprised of a plurality of microlenses 1330 that are identical.

As shown in fig. 2A, 2B and 3A, the microlens array is a plurality of microlenses 1330 formed on a substrate 1310, curved surfaces 1332 of the microlenses 1330 have a circular profile, and the microlenses 1330 are all the same size, and when the microlenses 1330 have a circular profile, a selectable range of the diameter d thereof is, for example, 0.2mm to 2 mm. The microlens array may be disposed on the front surface 1311 or the rear surface 1312 of the substrate 1310, or on both the front surface 1311 and the rear surface 1312 of the substrate 1310. When light passes through the microlens array and is refracted by the plurality of microlenses 1330, the exiting light can be slightly angularly adjusted, so that by providing at least one light fine-tuning element 1300 in the projection system 1000, the angle of the emitted light of the projection system 1000 can be effectively changed, improving the uniformity of the projected image.

As shown in fig. 2A, 2B and 3B, the microlens array is a plurality of microlenses 1330 formed on a substrate 1310, curved surfaces 1332 of the microlenses 1330 have a positive quadrilateral profile, and the microlenses 1330 are all the same size, and when the microlenses 1330 have a positive quadrilateral profile, the diameter of their circumscribed circle may be selected in a range of, for example, 0.2mm to 2 mm. The microlens array may be disposed on the front surface 1311 or the rear surface 1312 of the substrate 1310, or on both the front surface 1311 and the rear surface 1312 of the substrate 1310.

As shown in fig. 2A, 2B and 3C, the microlens array is a plurality of microlenses 1330 formed on a substrate 1310, curved surfaces 1332 of the microlenses 1330 have a regular hexagonal profile, and the microlenses 1330 are all the same size, and when the microlenses 1330 have a regular hexagonal profile, the diameter of their circumscribed circle may be selected in a range of, for example, 0.2mm to 2 mm. The microlens array may be disposed on the front surface 1311 or the rear surface 1312 of the substrate 1310, or on both the front surface 1311 and the rear surface 1312 of the substrate 1310.

In the microlens array, a plurality of microlenses 1330 are regularly arranged to form an array, and the microlenses 1330 may be made of one of a plastic material, a glass material, and a PET material. However, it will be appreciated by those skilled in the art that the raw materials for fabricating the microlens, etc., can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. The surface type of the microlens 1330 may be at least one of a spherical surface, an aspherical surface, or a free-form surface. Further, the surface type of the microlens 1330 may be selected to be, for example, an even-order aspherical surface.

In one embodiment of the present application, when the spherical surface is selected as the surface type of the microlens 1330, the radius of curvature thereof may be selected to be, for example, 35 mm.

In one embodiment of the present application, when the surface type of the microlens 1330 is an even-order aspheric surface, the surface type can be obtained according to the aspheric surface formula (1) and the parameters.

Wherein, Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position of the coordinate item r; c is the paraxial curvature of the aspheric surface, c ═ 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 below); k is the conic coefficient conc; alpha is alpha₁、α₂、α₃、α₄、α₅And alpha₆Are all high-order term coefficients. The following table 1 shows the conic coefficient k, the radius of curvature R, and the high-order term coefficients α of the aspherical microlens 1330 that can be used in the present embodiment₁、α₂、α₃、α₄、α₅And alpha₆。

TABLE 1

Flour mark

R

k

α ₁

α₂

α₃

α₄

α₅

α₆

1330

4.360E+ 001

-3.559E- 003

0

- 8.914E- 008

5.480E- 010

- 1.448E- 012

- 4.278E- 015

1.656E-017

In one embodiment of the present application, when the surface shape of the microlens 1330 is selected from a free curved surface, the surface shape thereof can be obtained according to the aspherical equation (2) and the parameters.

Wherein, Z is the rise of the distance from the free-form surface vertex when the free-form surface is at the position of the coordinate item (x, y); r is the square and root of the coordinate term (x, y); c is the curvature of the free-form surface, and c is 1/R (i.e., curvature c is the inverse of radius R in table 2 below); k is the conic coefficient conc; ai are all extended polynomial coefficients; ei (x, y) is an extended polynomial. Table 2 below shows the radius of curvature R, the conic coefficient k, and the parameter Ai of each expansion polynomial that can be used for the free-form-surface lens surface 111 in the present embodiment.

TABLE 2

Flour mark

R

k

Ay

Ax²

Ay²

Ax²y

Ay³

Ax⁴

1330

3.278E+002

0

1.000E+001

9.838E-001

-4.139E-001

1.733

-1.824

-8.953

Light trimming element 1300, which includes an array of microlenses, may be disposed inside projection lens module 1200 or outside projection module 1200.

In one embodiment, the light trimming element 1300 as shown in fig. 1 may be disposed outside the projection lens module 1200 and adjacent to the light exit side E4 of the projection lens module 1200, i.e., the side of the projection lens module 1200 away from the light source module 1100.

In one embodiment, light trim component 1300 as shown in fig. 4 may be disposed inside projection lens module 1200 and adjacent to lens E4 closest to the light exit side of projection lens module 1200.

In fig. 1 in which the projection lens module 1200 is disposed on the optical path of the emitted light of the light source module 1100 and includes 4 lenses, the light trimming member 1300 is disposed outside the lens module 1200 and adjacent to the lens E4 closest to the light exit side of the projection lens module 1200. The optical trim element 1300 includes a substrate 1310 and a microlens array, which may be disposed on the back surface 1312, but it should be understood that the microlens array may also be disposed on the front surface 1311, or on both the front surface 1311 and the back surface 1312.

When the light emitted from the light source module 1100 is modulated by the projection lens module 1200, the modulated light is emitted from the light emitting side, enters the light fine-tuning element 1300, and is subjected to a fine angle adjustment by refraction of the micro lens array therein.

Fig. 4 is a schematic diagram of a projection system 1000 according to an embodiment of the present application. As shown in fig. 4, projection system 1000 includes a light source module 1100, a projection lens module 1200, and a light trimming element 1300. Wherein the projection lens module 1200 is disposed on the light path of the emitted light of the light source module 1100, and includes 4 lenses E1 to E4. The light trimming element 1300 is disposed inside the lens module 1200 and adjacent to the lens E4 closest to the light exit side of the projection lens module 1200. The optical trim element 1300 includes a substrate 1310 and a microlens array, which can be disposed on the back surface 1312, but it should be understood that the microlens array can also be disposed on the front surface 1311, or on both the front surface 1311 and the back surface 1312.

When light emitted from the light source module 1100 enters the projection lens module 1200 from the incident side of the projection lens module 1200, the light sequentially passes through the first three lenses E1 to E3, is modulated and enters the light fine adjustment element 1300, and the emitted light is subjected to slight angle adjustment through refraction of the microlens array therein, then enters the lens E4 closest to the light emitting side of the projection lens module 1200, is modulated and emitted from the light emitting side, and is projected on a surface such as a projection screen, a projection surface, a vehicle front floor, and the like. The light emitted from the light source module 1100 passes through the modulation of the projection lens module 1200 and the adjustment of the tiny angle of the emergent light by the light fine-tuning element 1300, so that the illumination uniformity of the projected image can be effectively improved, and the occurrence of color fringes on the projected image is reduced.

Fig. 5 is a schematic diagram of a projection system 1000 according to an embodiment of the present application. As shown in fig. 5, projection system 1000 includes a light source module 1100, a projection lens module 1200, and a light trimming element 1300. Wherein the projection lens module 1200 is disposed on the light path of the emitted light of the light source module 1100, and includes 4 lenses E1 to E4. The light trimming element 1300 is disposed inside the lens module 1200 and is adjacent to the lens E1 closest to the light incident side of the projection lens module 1200 (i.e., the side of the projection lens module 1200 adjacent to the light source module 1100, in other words, the side opposite to the above-described exit side). Optical vernier element 1300 includes a substrate 1310 and a microlens array. The microlens array can be disposed on the back surface 1312, but it should be understood that the microlens array can also be disposed on the front surface 1311, or on both the front surface 1311 and the back surface 1312.

When light emitted from the light source module 1100 enters the projection lens module 1200 from the incident side of the projection lens module 1200, is modulated by the lens E1 closest to the light incident side of the projection lens module 1200, enters the light trimming element 1300, is subjected to slight angle adjustment by refraction of the microlens array therein, sequentially enters the remaining three lenses E2 to E4, is modulated, and is emitted from the light emitting side to be projected on a surface such as a projection screen, a projection surface, a vehicle front floor surface, and the like.

The light emitted from the light source module 1100 passes through the modulation of the projection lens module 1200 and the adjustment of the tiny angle of the emergent light by the light fine-tuning element 1300, so that the illumination uniformity of the projected image can be effectively improved, and the occurrence of color fringes on the projected image is reduced.

Fig. 6A to 6E are schematic structural diagrams of a projection system 1000 according to another embodiment of the present application. As shown in fig. 6A to 6E, the projection system 1000 includes a light source module 1100, a projection lens module 1200, and a light trimming element 1300. The projection lens module 1200 is disposed on the light path of the light emitted from the light source module 1100, and includes 5 lenses E1 to E5, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 are sequentially arranged from the light incident side to the light exit side of the projection lens module 1200. Light trimming element 1300 may be disposed inside lens module 1200. As shown in fig. 6A, light trimming element 1300 may be disposed between first lens E1 and second lens E2; as shown in fig. 6B, light trimming element 1300 may be disposed between second lens E2 and third lens E3; as shown in fig. 6C, light trimming element 1300 may be disposed between third lens E3 and fourth lens E4; as shown in fig. 6D, light trimming element 1300 may be disposed between fourth lens E4 and fifth lens E5; as shown in fig. 6E, light trimming element 1300 may be disposed between fifth lens E5 and the light exit side.

The optical trim element 1300 includes a substrate 1310 and a microlens array, which may be disposed on the back surface 1312, but it should be understood that the microlens array may also be disposed on the front surface 1311, or on both the front surface 1311 and the back surface 1312.

When light emitted from the light source module 1100 enters the projection lens module 1200 from the incident side of the projection lens module 1200, is modulated by the plurality of lenses E1 to E5 and refracted by the microlens array in the light fine adjustment element 1300 in sequence, and then is emitted from the light emitting side, and the exit angle of the light is adjusted by the small angle of the light fine adjustment element 1300 and then is projected on a surface such as a projection screen, a projection surface, a vehicle front floor surface, and the like, the uniformity of the illuminance of a projected image can be effectively improved, and the occurrence of color fringing in the projected image can be reduced.

Fig. 7A to 7F are schematic structural diagrams of a projection system 1000 according to another embodiment of the present application. As shown in fig. 7A to 7F, the projection system 1000 includes a light source module 1100, a projection lens module 1200, and a light trimming element 1300. The projection lens module 1200 is disposed on the light path of the light emitted from the light source module 1100, and includes 6 lenses E1 to E6, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 are sequentially arranged from the light incident side to the light exit side of the projection lens module 1200. Light trimming element 1300 may be disposed inside lens module 1200. As shown in fig. 7A, light trimming element 1300 may be disposed between first lens E1 and second lens E2; as shown in fig. 7B, light trimming element 1300 may be disposed between second lens E2 and third lens E3; as shown in fig. 7C, light trimming element 1300 may be disposed between third lens E3 and fourth lens E4; as shown in fig. 7D, light trimming element 1300 may be disposed between fourth lens E4 and fifth lens E5; as shown in fig. 7E, light trimming element 1300 may be disposed between fifth lens E5 and sixth lens E6; as shown in fig. 7F, the light trimming element 1300 may be disposed between the sixth lens E5 and the light exit side.

The optical trim element 1300 includes a substrate 1310 and a microlens array, which can be disposed on the back surface 1312, but it should be understood that the microlens array can also be disposed on the front surface 1311, or on both the front surface 1311 and the back surface 1312.

When light emitted from the light source module 1100 enters the projection lens module 1200 from the incident side of the projection lens module 1200, is modulated by the plurality of lenses E1 to E6 and refracted by the microlens array in the light fine adjustment element 1300 in sequence, and then is emitted from the light emitting side, and the exit angle of the light is adjusted by the small angle of the light fine adjustment element 1300 and then is projected on a surface such as a projection screen, a projection surface, a vehicle front floor surface, and the like, the uniformity of the illuminance of a projected image can be effectively improved, and the occurrence of color fringing in the projected image can be reduced.

The above description is only an embodiment of the present application and an illustration of the technical principles applied. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A projection system, comprising:

the light source module is used for emitting light carrying display information; and

a projection lens module disposed on a light path of the light emitted from the light source module and including at least one lens to modulate the light;

wherein the projection system further comprises at least one light trimming element, the at least one light trimming element comprising:

a substrate; and

and the micro-lens array is formed on the substrate and consists of a plurality of micro-lenses and is used for performing refraction processing on the light so as to finely adjust the emergent angle of the light.

2. The projection system of claim 1, wherein the light trim component is disposed inside the projection lens module or outside the projection lens module.

3. The projection system of claim 2, wherein the light trim component is disposed within the projection lens module and adjacent to a lens closest to the light exit side of the projection lens module.

4. The projection system of claim 2, wherein the light trim component is disposed outside of the projection lens module adjacent to the light exit side of the projection lens module.

5. The projection system of claim 1, wherein the substrate has a front surface facing the incident direction of the light and a rear surface opposite to the front surface, and the microlens array is disposed on a disposition surface of the substrate, the disposition surface being at least one of the front surface and the rear surface.

6. The projection system of claim 5, wherein the microlens array protrudes from the setting surface.

7. The projection system of claim 5 or 6, wherein the array of microlenses is recessed in the setting surface.

8. The projection system of claim 1, wherein the thickness h of the microlenses satisfies: h is more than or equal to 0.5 mu m and less than or equal to 100 mu m.

9. The projection system of claim 1, wherein the diameter d of the circle circumscribing the curved surface of the microlens ranges from 0.2mm to 2 mm.

10. A method for preparing a projection system as claimed in any one of claims 1 to 9, the method comprising:

preparing a light trimming element comprising a microlens array;

disposing a projection lens module on a light path of light emitted from a light source module to modulate the light; and

arranging the light trim component in the light path of the light,

wherein preparing a light trimming element comprising a microlens array comprises:

forming the microlens array including microlenses of different shape configurations on a substrate.