WO2023097767A1

WO2023097767A1 - Optical projection module and illumination device

Info

Publication number: WO2023097767A1
Application number: PCT/CN2021/137783
Authority: WO
Inventors: 郭恒琳
Original assignee: 歌尔光学科技有限公司
Priority date: 2021-11-30
Filing date: 2021-12-14
Publication date: 2023-06-08
Also published as: CN216748409U

Abstract

An optical projection module and an illumination device. The optical projection module comprises: a display chip (2), a dimming component (3), and a first lens group and a second lens group wherein the focal length of the first lens group is different to the focal length of the second lens group; the display chip (2) has a first deflection angle and a second deflection angle, and the display chip (2) can turn and switch between the first deflection angle and the second deflection angle; a first light beam is formed when the display chip (2) is turned to the first deflection angle, and a second light beam is formed when the display chip (2) is turned to the second deflection angle; the dimming component (3) is used for receiving and modulating the first light beam and the second light beam, so that the first light beam is incident on the first lens group, and the second light beam is incident on the second lens group.

Description

Optical projection module and lighting machine

This application claims the priority of the Chinese patent application with the application number 202122993122.3 and the title of the invention "Optical Projection Module and Illumination Light Machine" submitted to the China Patent Office on November 30, 2021, the entire contents of which are incorporated in this application by reference middle.

technical field

The present application relates to the field of optical projection technology, and more specifically, the present application relates to an optical projection module and electronic equipment.

Background technique

At present, the projection optical system develops rapidly and has a wide range of application fields. However, a projector using a fixed-focus lens can only project images within a certain distance, and cannot realize images with different projection distances. A projector with a zoom lens can realize the transformation of the size and distance of the projection screen by adjusting the focal length of the lens, but the zoom lens has problems such as limited zoom ratio, difficult design, high price and low yield rate.

Therefore, making the projector capable of displaying images with different projection distances and avoiding the defects caused by the zoom lens is an urgent technical problem to be solved.

Contents of the invention

An object of the present application is to provide a new technical solution for an optical projection module and electronic equipment.

According to the first aspect of the embodiments of the present application, an optical projection module is provided. The optical projection module includes: a display chip, a dimming component, a first lens group and a second lens group, the focal length of the first lens group is different from the focal length of the second lens group;

The display chip has a first deflection angle and a second deflection angle, and the display chip can rotate and switch between the first deflection angle and the second deflection angle;

The display chip is rotated to the state of the first deflection angle to form a first light beam;

The display chip is rotated to the state of the second deflection angle to form a second light beam;

The dimming component is used to receive and modulate the first light beam and the second light beam, so that the first light beam is incident on the first lens group, and the second light beam is incident on the second lens group. lens group.

Optionally, the first lens group includes a first fixed-focus lens and a first multiplier, and the first multiplier is used to receive and transmit the first light beam emitted from the first fixed-focus lens;

The second lens group includes a second fixed-focus lens and a second multiplier, the second multiplier is used to receive and transmit the second light beam emitted from the second fixed-focus lens, and the first multiplier The focal length of the multiplier is different from that of the second multiplier.

Optionally, the optical projection module includes a fixed-focus lens, a first multiplier and a second multiplier, and the focal length of the first multiplier is different from that of the second multiplier;

The fixed-focus lens and the first multiplier constitute the first lens group;

The fixed-focus lens and the second multiplier constitute the second lens group.

Optionally, the dimming component includes a first reflective mirror disposed on the light-emitting side of the display chip and an optical component having a diopter disposed on the light-emitting side of the first reflective mirror.

Optionally, the dimming component is a turning prism.

Optionally, the incident surface, the reflective surface and the outgoing surface of the turning prism, at least one of the reflective surface and the outgoing surface is non-planar.

Optionally, the optical projection module further includes a first mirror group, and the first mirror group is located between the fixed-focus lens and the first extender mirror.

Optionally, the optical projection module further includes a second mirror group, and the second mirror group is located between the fixed-focus lens and the second extender.

According to the second aspect of the embodiments of the present application, an electronic device is provided. The electronic device includes the optical projection module described in the first aspect.

A technical effect of the present application is that the optical projection module includes a first lens group and a second lens group of a display chip and a dimming component. Two non-overlapping light beams are formed by the display chip and the dimming component. Two non-overlapping beams pass through the first lens group and the second lens group to form two images with different throw ratios. The optical projection module of the embodiment of the present application can project images with different projection distances.

Other features of the present application and advantages thereof will become apparent through the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only The accompanying drawings are a part of this application, and those skilled in the art can obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a first schematic diagram of the structure of the optical projection module in the embodiment of the present application.

Figure 2 is an enlarged view of the structure at a in Figure 1 .

FIG. 3 is a second schematic diagram of the structure of the optical projection module in the embodiment of the present application.

FIG. 4 is a schematic diagram of the third structure of the optical projection module in the embodiment of the present application.

FIG. 5 is a schematic diagram of the fourth structure of the optical projection module in the embodiment of the present application.

Explanation of reference signs:

1. Light-emitting component; 2. Display chip; 21. Protective cover; 22. Microlens; 3. Dimming component; 4. Fixed-focus lens; 51. First multiplier; 52. Second multiplier; 61 , the first reflector; 62, the second reflector; 63, the third reflector; 64, the fourth reflector; 65, the fifth reflector; 7, the optical element.

Detailed ways

The following will describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses.

Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The first aspect of the embodiments of the present application provides an optical projection module. Referring to Figures 1-5, the optical projection module includes: a display chip 2, a dimming component 3, a first lens group and a second lens group, and the focal length of the first lens group is different from that of the second lens group;

The display chip 2 has a first deflection angle A1 and a second deflection angle A2, and the display chip 2 can rotate and switch between the first deflection angle A1 and the second deflection angle A2. For example, the display chip 2 receives incident light, and processes the incident light (such as reflection or transmission, etc.), so as to project the processed incident light to the dimming component 3 .

The display chip 2 is rotated to the state of the first deflection angle A1 to form a first light beam L1. The display chip 2 rotates to the state of the second deflection angle A2 to form a second light beam L2. The dimming component 3 is used to receive and modulate the first light beam L1 and the second light beam L2, so that the first light beam L1 is incident on the first lens group, and the second light beam is incident on the second lens group. lens group.

In this embodiment, the optical projection module includes an illumination optical path and an imaging optical path. In this embodiment, the light beam emitted by the external light emitting component 1 is projected to the display chip 2 . The display chip 2 and the dimming component 3 form an illumination light path. Two non-overlapping beams are formed through the illumination optical path. In a specific embodiment, the light emitted by the light-emitting component 1 can pass through the dimming component 3 and then enter the display chip 2, and the light received by the display chip 2 can be incident on the dimming component 3 to form illumination light path. For example, the display chip 2 may be a digital micromirror device.

The display chip 2 may be a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel), a digital micromirror device (Digital Micro-mirror Device, DMD), or the like. In some other embodiments, the display chip 2 can also be a transparent liquid crystal panel (Transparent Liquid Crystal Panel), an electro-optical modulator (Electro-Optical Modulator), a magneto-optic modulator (Magneto-Optic modulator), an acousto-optic modulator Acousto-Optic Modulator (AOM) and other transmissive optical modulators. The present invention does not limit the type and type of the display chip 2 .

The first lens group and the second lens group form an imaging optical path. Since the focal lengths of the first lens group and the second lens group are different, two images with different projection ratios are formed by the first lens group and the second lens group.

In this embodiment, the optical projection module includes a display chip 2 . The display chip 2 has a first deflection angle A1 and a second deflection angle A2. When the display chip 2 rotates to the first deflection angle A1 (positive first deflection angle A1), the display chip 2 can reflect the light incident on it at a first angle to form a first light beam L1. When the display chip 2 rotates to the second deflection angle A2 (positive second deflection angle A2), the display chip 2 can reflect the light incident on it at a second angle to form a second light beam L2. The first angle is the reflection angle of the first light beam L1 on the display chip 2 , and the second angle is the reflection angle of the second light beam L2 on the display chip 2 .

Since the first deflection angle A1 is different from the second deflection angle A2, the reflection angle of the first light beam L1 on the display chip 2 is different from the reflection angle of the second light beam L2 on the display chip 2, so that the light emitted from the display chip 2 The first light beam L1 and the second light beam L2 do not overlap. Referring to FIG. 1, the first light beam L1 and the second light beam L2 are separated in the vertical direction. The thin lines represent the first light beam L1, and the thick lines represent the second light beam L2.

In this embodiment, the optical projection module includes a dimming component 3 . Wherein the dimming component 3 is located at the light emitting side of the display chip 2 . The dimming component 3 is configured to receive the first light beam L1 and the second light beam L2 emitted from the display chip 2 . In addition, the dimming component 3 is also used to adjust the outgoing directions of the first light beam L1 and the second light beam L2 from the dimming component 3 , so that the first light beam L1 and the second light beam L2 do not overlap after passing through the dimming component 3 .

Specifically, the first light beam L1 emitted from the dimming component 3 is incident on the first lens group to form a first image with a first projection ratio. The second light beam L2 emitted from the dimming component 3 is incident to the second lens group to form a second image with a second projection ratio.

The first light beam L1 emitted from the dimming component 3 enters the first lens group, and then displays a first image on the first display component. The second light beam L2 emitted from the dimming component 3 enters the second lens group, and then displays a second image on the second display component.

Because the focal lengths of the first lens group and the second lens group are different. Thus the first throw ratio of the first image is different from the second throw ratio of the second image. The throw ratio is the ratio of the projection distance to the screen width. The throw ratio determines the distance between the optical projection module and the display component.

For example, the focal length of the first lens group is smaller than that of the second lens group, the first lens group can realize short-distance projection, and the second lens group can realize long-distance projection.

The first image and the second image may display the same frame, or the first image and the second image may display different frames. For example, the first display component and the second display component may be a curtain, a desktop, a wall, or glass.

In the embodiment of the present application, the display chip 2 is under the state controlled by timing (for example, the time sequence of the control signals that should be sent when performing instructions. The interrelationship of these control signals in time is exactly the timing of the digital micromirror controller) , the display chip 2 rotates so that the display chip 2 switches between the first deflection angle A1 and the second deflection angle A2, and the display chip 2 combines with the dimming component 3 to form a non-overlapping first beam and a second beam, and then pass The first lens group and the second lens group enable the optical projection module to project the first image and the second image with different projection ratios at the same time, realizing the switching of long and short distance images. The high-speed switching of long-distance and short-distance images, using the principle of human visual suspension, the human eye can see the first image and the second image displayed at the same time.

In this embodiment, by adjusting the focal lengths of the first lens group and the second lens group, the first lens group and the second lens group can achieve a wide range of throw ratio changes, so that the virtual image distance can cover 0.5m-50m, but The virtual image distance is not limited to this distance.

In an optional embodiment, the display chip 2 further includes a protective cover 21 . The protective cover is a plane lens.

In one embodiment, the first lens group includes a first fixed-focus lens and a first multiplier 51, and the first multiplier 51 is used to receive and transmit the first fixed-focus lens emitted from the first fixed-focus lens. a light beam;

The second lens group includes a second fixed-focus lens and a second multiplier 52, and the second multiplier 52 is used to receive and transmit the second light beam emitted from the second fixed-focus lens.

The focal length of the first extender 51 is different from that of the second extender 52 .

In this embodiment, the focal length of the first fixed-focus lens and the focal length of the second fixed-focus lens may be the same or different.

The first fixed-focus lens and the second fixed-focus lens can be arranged on different sides or the same side of the dimming component 3 . The first fixed-focus lens and the second fixed-focus lens are arranged on different sides of the light-adjusting component 3, and the first light beam L1 and the second light beam L2 modulated by the light-adjusting component 3 are emitted from different sides of the light-adjusting component 3; the first fixed-focus lens The second fixed-focus lens is arranged on the same side of the dimming component, and the dimming component 3 modulates the first light speed L1 and the second light beam L2 is emitted from the same side of the dimming component 3 .

In this embodiment, the first light beam L1 enters the first fixed-focus lens and passes through the first multiplier 51 to form a first image with a first projection ratio; the second light beam L2 enters the second fixed-focus lens and passes through The second extender 52 forms a second image with a second projection ratio.

In one embodiment, as shown in FIG. 1 , the optical projection module includes a fixed-focus lens 4, a first multiplier 51 and a second multiplier 52; the fixed-focus lens 4 and the first multiplier The multiplier 51 constitutes the first lens group; the fixed-focus lens 4 and the second multiplier 52 constitute the second lens group.

In this embodiment, a fixed-focus lens 4 is provided on the light-emitting side of the dimming component 3 . The dimming component 3 modulates the first light beam L1 and the second light beam L2 to emit from the same side of the dimming component 3 . The dimming component 3 projects both the first light beam L1 and the second light beam L2 to the fixed-focus lens 4 . The first light beam L1 and the second light beam L2 can be projected by using the same fixed-focus lens 4 .

The first light beam L1 emitted from the dimming component 3 is projected onto the fixed-focus lens 4 , and a first multiplier 51 is arranged between the fixed-focus lens 4 and the first display component. After the first light beam L1 emitted from the fixed-focus lens 4 passes through the first multiplier 51, a first image is displayed on the first display component.

The second light beam L2 emitted from the dimming component 3 is projected onto the fixed-focus lens 4, and a second multiplier 52 is arranged between the fixed-focus lens 4 and the second display component. After the second light beam L2 emitted from the fixed-focus lens 4 passes through the second multiplier 52 , a second image is displayed on the second display component.

In this embodiment, by adjusting the focal lengths of the first multiplier 51 and the second multiplier 52, the first multiplier 51 and the second multiplier 52 cooperate with the fixed-focus lens 4 to achieve a wider range of projection ratio. Change, so that the virtual image distance can cover 0.5m-50m, but the virtual image distance is not limited to this distance.

Since the focal lengths of the first extender 51 and the second extender 52 are different, that is, the multiples of the first extender 51 and the second extender 52 are different. Thus the throw ratio of the first image and the throw ratio of the second image are different. The throw ratio is the ratio of the projection distance to the screen width. The throw ratio determines the distance between the optical projection module and the display component.

For example, the focal length of the first extender 51 is smaller than that of the second extender 52 , the first extender 51 can realize short-distance projection, and the second extender 52 can realize long-distance projection.

In one embodiment, as shown in FIG. 5 , the dimming component 3 includes a first reflector 61 arranged on the light-emitting side of the display chip 2 and a mirror 61 arranged on the light-emitting side of the first reflector 61 . Diopter optics 7.

Specifically, the dimming component 3 functions to reflect the first light beam L1 and the second light beam L2, and to modulate the propagation angle of the first light beam L1 and the second light beam L2.

The dimming component 3 includes a first reflector 61 and a diopter optical element 7, wherein the first reflector 61 and the diopter optical element 7 are two independent optical components. The optical element 7, for example a diopter, may be a freeform mirror.

The first mirror 61 reflects the first light beam L1 to the optical element 7 of diopter. The first light beam L1 propagates to the fixed-focus lens 4 through the diopter optical element 7 . At the same time, the first mirror 61 reflects the second light beam L2 to the optical element 7 of diopter. The second light beam L2 propagates to the fixed-focus lens 4 through the diopter optical element 7 .

Specifically, the curved surface design of the diopter optical element 7 can compensate the relative deflection angles of the first light beam L1 and the second light beam L2. Both the first light beam L1 and the second light beam L2 are emitted from the diopter optical element 7, so that the first light beam L1 and the second light beam L2 are parallel light beams.

The first light beam L1 and the second light beam L2 are emitted as two parallel light beams from the diopter optical element 7. A fixed-focus lens 4 can receive the two different light beams, and pass through the first multiplier 51 and the second light beam with different focal lengths. Two extender mirrors 52 to form two images with different projection ratios. If the first light beam L1 and the second light beam L2 are emitted from the dimming component 3 , the two light beams are emitted in different directions, on the one hand, it is inconvenient to install the fixed-focus lens 4 . On the other hand, it is not conducive to reducing the volume of the optical projection system.

In one embodiment, as shown in FIG. 1 , FIG. 3 and FIG. 4 , the dimming component 3 is a turning prism.

Specifically, in this embodiment, the reflection of the first light beam L1 and the second light beam L2 is realized through the turning prism, and at the same time, the modulation of the propagation angle of the first light beam L1 and the modulation of the propagation angle of the second light beam L2 are realized through the turning prism, This makes the structure of the optical projection module more compact.

The turning prism includes an incident surface S3, a reflective surface S1 and an outgoing surface S2, the incident surface S3 is located on the light-emitting side of the working surface of the display chip 2, and the incident surface S3 is parallel to the working surface of the display chip 2; The emitting surface S2 is located on the light emitting side of the reflecting surface S1.

The length of the incident surface S3 of the turning prism is jointly determined by the two deflection angles of the display chip 2 , the material of the turning prism, and the shape of the turning prism. For example, light reflected from the display chip 2 enters the turning prism through the incident surface S3 of the device prism, and propagates in the turning prism.

Specifically, the reflection angle of the light beam reflected from the display chip 2 is related to the deflection angle of the display chip 2 . When the light beam reflected from the display chip 2 enters the turning prism and propagates, the propagation direction of the light beam is related to the material of the turning prism; the light beam entering the turning prism through the incident surface S3 of the turning prism is related to the shape of the turning prism, and The angle of exit from the turning prism is related to the material of the turning prism.

If the length of the incident surface S3 of the turning prism is too short, it is unfavorable for the first light beam L1 and the second light beam L2 to enter into the turning prism. If the length of the incident surface S3 of the turning prism is too long, it is not conducive to reducing the volume of the optical projection module.

In a specific embodiment, as shown in FIG. 1 , the dimming component 3 is a turning prism. The turning prism includes a reflective surface S1, an outgoing surface S2, and an incident surface S3, wherein the reflective surface S1, the outgoing surface S2, and the incident surface S3 are all planar lenses. The incident surface S3 is located on the light emitting side of the working surface of the display chip 2 , and the incident surface S3 is parallel to the working surface of the display chip 2 ; the outgoing surface S2 is located on the light emitting side of the reflecting surface S1 .

The light emitted by the light-emitting component 1 can pass through the reflective surface S1 of the turning prism and then propagate to the display chip 2, and the light reflected by the display chip 2 can propagate to the reflecting surface S1 of the turning prism through the incident surface S3 of the turning prism. The light is reflected from the reflection surface S1 of the turning prism to the exit surface S2 of the turning prism, and the light is transmitted from the exit surface S2 of the turning prism to the fixed-focus lens 4 . Since the exit surface S2 of the turning prism is a flat lens, the first light beam L1 and the second light beam L2 are emitted from the turning prism and travel in different directions.

In a specific embodiment, as shown in FIG. 3 and FIG. 4, the turning prism includes a reflective surface S1, an outgoing surface S2, and an incident surface S3, and at least one of the reflective surface S1 and the outgoing surface S2 is non-planar.

Specifically, the incident surface S3 is located on the light-emitting side of the working surface of the display chip 2, and the incident surface S3 is parallel to the working surface of the display chip 2; the outgoing surface S2 is located on the light-emitting side of the reflecting surface S1, and at least One is non-planar.

In one embodiment, the reflective surface S1 of the turning prism is a plane, and the outgoing surface S2 of the turning prism is non-planar.

In yet another embodiment, the reflective surface S1 of the turning prism is non-planar, and the outgoing surface S2 of the turning prism is non-planar.

The non-planar curved surface design in the embodiment of the present application can compensate the relative deflection angles of the first light beam L1 and the second light beam L2. Both the first light beam L1 and the second light beam L2 are emitted from the non-planar mirror, so that the first light beam L1 and the second light beam L2 are parallel light beams.

The first light beam L1 and the second light beam L2 are emitted from the non-planar mirror as two parallel light beams, and a fixed-focus lens 4 can receive the two different light beams to form two images with different projection ratios. If the first light beam L1 and the second light beam L2 are emitted from the dimming component 3 , the two light beams will propagate in different directions. On the one hand, it is not convenient to install the fixed-focus lens 4 . On the other hand, it is not conducive to reducing the volume of the optical projection system.

In addition, this embodiment realizes the reflection of the first light beam L1 and the second light beam L2 through the turning prism, and at the same time realizes the modulation of the propagation angle of the first light beam L1 and the modulation of the propagation angle of the second light beam L2 through the turning prism, so that The structure of the optical projection module is more compact.

In one embodiment, as shown in FIG. 3 and FIG. 4 , the optical projection module further includes a first mirror group, and the first mirror group is located between the fixed-focus lens 4 and the first multiplier. between mirrors 51.

In one embodiment, as shown in FIG. 3 and FIG. 4 , the optical projection module further includes a second mirror group, and the second mirror group is located between the fixed-focus lens 4 and the second multiplier. Between the mirrors 52.

Specifically, the first light beam L1 is formed by the fixed-focus lens 4 and then reflected by the first mirror group to act on the first multiplier 51 . Wherein the setting position of the first reflective mirror group is related to the position of the first display part, so that the picture after the fixed-focus lens 4 is imaged reflects the first reflective mirror group on the first multiplier 51, and then directly on the first multiplier 51. displayed on the display part.

The second light beam L2 is imaged by the fixed-focus lens 4 and then reflected by the second mirror group to act on the second multiplier 52 . Wherein the setting position of the second mirror group is related to the position of the second display part, so that the picture after the fixed-focus lens 4 is imaged reflects the second mirror group on the second multiplier 52, and then directly on the second multiplier 52. displayed on the display part.

For example, as shown in FIG. 3 , the optical projection module is applied to the synchronous display scene of desktop projection and wall projection. The desktop setting position and the wall setting position are perpendicular to each other.

In this embodiment, the first reflective mirror group includes a second reflective mirror 62 , and the first light beam L1 is formed by the fixed-focus lens 4 and reflected by the second reflective mirror 62 to act on the first multiplier mirror 51 . The first light beam L1 is used to project an image with a small throw ratio.

The second reflector group includes a third reflector 63 and a fourth reflector 64, after the second light beam L2 is imaged by the fixed-focus lens 4, it is reflected by the third reflector 63 and applied to the fourth reflector 64, after passing through the first The reflection of the four mirrors 64 acts on the second extender mirror 52 . The second light beam L2 is used to project an image with a large throw ratio.

The second reflector 62 and the third reflector 63 are arranged at an angle, and the third reflector 63 and the fourth reflector 64 are arranged in parallel.

For example, as shown in FIG. 4 , the optical projection module is applied to the synchronous display scene of far and near imaging of HUD (head-up display). In the far and near imaging of HUD, it is necessary to display both the image with large projection ratio and the image with small projection ratio in front of the vehicle. For example, information such as vehicle speed, fuel level, and rotational speed are projected and suspended on the hood or other optical components such as window glass; for example, information such as road signs and routes are projected and suspended in front of the car.

In this embodiment, the first reflective mirror group includes a second reflective mirror 62 and a fifth reflective mirror 65, the first light beam L1 is imaged by the fixed-focus lens 4 and then reflected by the second reflective mirror 62 to the fifth reflective mirror 65 , the reflection by the fifth reflector 65 acts on the first multiplier 51 . The first light beam L1 is used to project a short-distance image.

The second reflector group includes a third reflector 63 and a fourth reflector 64, after the second light beam L2 is imaged by the fixed-focus lens 4, it is reflected by the third reflector 63 and applied to the fourth reflector 64, after passing through the first The reflection of the four mirrors 64 acts on the second extender mirror 52 . The second light beam L2 is used to project a long-distance image.

In an optional embodiment, the fixed-focus lens 4 is an image-space telecentric lens.

In this embodiment, the image-space telecentric lens forms the image-space telecentric optical path. Since the lens in the image-space telecentric lens is an axisymmetric structure, the image-space telecentric lens forms an axisymmetric image-space telecentric optical path. The first light beam L1 and the second light beam L2 are formed by beam splitting through the illumination light path. The first beam L1 and the second beam L2 after beam splitting are imaged by an axisymmetric telecentric optical path on the image side, and then act on the first multiplier 51 and the second multiplier 52 respectively through the mirror group, so as to realize different Throw ratio image. In addition, in this embodiment, the fixed-focus lens 4 adopts an image-side telecentric lens, which can improve the quality of the projected picture.

In an optional embodiment, as shown in FIG. 1 and FIG. 2, the optical projection module includes a digital micromirror controller, and the display chip 2 is a digital micromirror device;

The digital micromirror device has a plurality of microlenses 22, and the digital micromirror controller controls the rotation of the microlenses 22, so that the microlenses 22 switch between the first deflection angle A1 and the second deflection angle A2.

Specifically, the light beam emitted by the light-emitting component 1 is irradiated on the digital micromirror device, and the digital micromirror controller (not shown in the figure) is used to control the deflection of the array of micromirrors 22 of the digital micromirror device, thereby modulating the angle of the light source, The first light beam L1 and the second light beam L2 are alternately reflected by the digital micromirror device.

For example, the PWM (pulse width modulation) modulation value is stored in the digital micromirror controller, and the frame frequency of the modulation digital micromirror device is within the set range; the corresponding PWM modulation value of each microlens 22 is correspondingly set, and the control corresponds to The number of openings of the microlens 22, the rotation angle of the opening frequency, and the principle of persistence of vision of the human eye are used to enable the optical projection module to simultaneously display far and near projection images.

In a specific embodiment, the digital micromirror device includes a plurality of microlenses 22 , and the size of the microlenses 22 ranges from 14 μm to 16 μm. The digital micromirror device usually consists of an array of up to 500,000 to 2 million microlenses 22 . The microlens 22 rotates around the hinge as a rotation axis, wherein the rotation angle is a first deflection angle A1 and a second deflection angle A2. Specifically, through timing control, the microlens 22 is switched between the first deflection angle A1 and the second deflection angle A2.

In the digital micromirror device, each microlens 22 is an independent individual, and can be flipped to the first deflection angle A1 (positive or negative) and the second deflection angle A2 (positive or negative), so the microlens can It reflects the light it receives at different angles.

The digital micromirror device has three stable states, which include "on" state, "off" state and no signal state. Wherein, the rotation angle of the digital micromirror device is the positive first deflection angle A1 or the positive second deflection angle A2, and the display chip 2 is in the "on" state. The rotation angle of the digital micromirror device is the negative first deflection angle A1 or the negative second deflection angle A2, and the digital micromirror device is in the "off" state. The rotation angle of the digital micromirror device is 0°, and the display chip 2 is in a state of no signal.

In an optional embodiment, the difference between the first deflection angle A1 and the second deflection angle A2 ranges from 10° to 15°.

Specifically, the first deflection angle A1 and the second deflection angle A2 affect the reflection angle of the light beam on the display chip 2 . For example, when the display chip 2 rotates to the first deflection angle A1, the display chip 2 reflects the first light beam L1, and the reflection angle and propagation direction of the first light beam L1 are related to the first deflection angle A1 of the display chip 2. The display chip 2 rotates to the second deflection angle A2, and the display chip 2 reflects the second light beam L2, and the reflection angle and propagation direction of the second light beam L2 are related to the second deflection angle A2 of the display chip 2.

For example, the difference between the first deflection angle A1 and the second deflection angle A2 is small, and the separation between the first light beam L1 and the second light beam L2 is not obvious enough, which affects the imaging effect of the first image and the second image. The difference between the first deflection angle A1 and the second deflection angle A2 is small, and the separation distance between the first light beam L1 and the second light beam L2 is relatively large, so a longer dimmer component 3 is required to receive the first light beam L1 and the second light beam L1. The light beam L2 is not conducive to the reduction design of the optical projection module. Limiting the difference range between the first deflection angle A1 and the second deflection angle A2 within this range can further reduce the volume of the optical projection module without affecting the imaging effect of the first image and the second image .

In a specific embodiment, the first deflection angle A1 is ±17°, the second deflection angle A2 is ±30°, when the display chip 2 is in the "on" state, the microlens 22 of the display chip 2 needs to be polarized by +17° ° or +30°, so the difference between the two in this embodiment is 13°.

Optionally, the electronic device is an illumination light machine or a head-up display. Electronic devices are capable of simultaneously displaying images of different throw ratios. In addition, it should be noted that the electronic devices provided in the embodiments of the present application include but are not limited to the above-mentioned lighting machines or head-up displays, and may also be other types of electronic devices. For example, the electronic device is a smart wearable device.

The above-mentioned embodiments focus on the differences between the various embodiments. As long as the different optimization features of the various embodiments do not contradict each other, they can be combined to form a better embodiment. Considering the brevity of the text, no further repeat.

Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, rather than limiting the scope of the present application. Those skilled in the art will appreciate that modifications can be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

An optical projection module, characterized in that it includes: a display chip (2), a dimming component (3), a first lens group and a second lens group, the focal length of the first lens group is different from that of the second lens groups with different focal lengths;

The display chip (2) has a first deflection angle and a second deflection angle, and the display chip (2) can rotate and switch between the first deflection angle and the second deflection angle;

The display chip (2) is rotated to the state of the first deflection angle to form a first light beam;

The display chip (2) is rotated to the state of the second deflection angle to form a second light beam;

The dimming component (3) is used to receive and modulate the first light beam and the second light beam, so that the first light beam is incident on the first lens group, and the second light beam is incident on the Describe the second lens group.
The optical projection module according to claim 1, wherein the first lens group includes a first fixed-focus lens and a first multiplier, and the first multiplier is used to receive and transmit the the first light beam emitted by the first fixed-focus lens;

The second lens group includes a second fixed-focus lens and a second multiplier, and the second multiplier is used to receive and transmit the second light beam emitted from the second fixed-focus lens;

The focal length of the first multiplier is different from that of the second multiplier.
The optical projection module according to claim 1, wherein the optical projection module comprises a fixed-focus lens (4), a first multiplier (51) and a second multiplier (52), the The focal length of the first multiplier (51) is different from the focal length of the second multiplier (52);

The fixed-focus lens (4) and the first multiplier (51) constitute the first lens group;

The fixed-focus lens (4) and the second multiplier (52) constitute the second lens group.
The optical projection module according to any one of claims 1-3, characterized in that the dimming component (3) includes a first reflector (61) and An optical element (7) with a diopter arranged on the light exit side of the first reflecting mirror (61).
The optical projection module according to any one of claims 1-3, characterized in that, the dimming component (3) is a turning prism.
The optical projection module according to claim 5, wherein the turning prism comprises an incident surface, a reflecting surface and an outgoing surface, and at least one of the reflecting surface and the outgoing surface is non-planar.
The optical projection module according to claim 3, characterized in that, the optical projection module further comprises a first mirror group, and the first mirror group is located between the fixed-focus lens (4) and the second Between one extender lens (51).
The optical projection module according to claim 3, characterized in that, the optical projection module further comprises a second mirror group, and the second mirror group is located between the fixed-focus lens (4) and the second mirror group. Between the two extenders (52).
An electronic device, characterized in that the electronic device comprises the optical projection module according to any one of claims 1-8.