CN115808796A - Projection system, vehicle and projection method - Google Patents

Projection system, vehicle and projection method Download PDF

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Publication number
CN115808796A
CN115808796A CN202111088878.1A CN202111088878A CN115808796A CN 115808796 A CN115808796 A CN 115808796A CN 202111088878 A CN202111088878 A CN 202111088878A CN 115808796 A CN115808796 A CN 115808796A
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China
Prior art keywords
light
grating
imaging
module
projection system
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Pending
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CN202111088878.1A
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Chinese (zh)
Inventor
杨佳
周燕
郎海涛
王志超
顾菲
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Ningbo Sunny Automotive Optech Co Ltd
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Ningbo Sunny Automotive Optech Co Ltd
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Priority to CN202111088878.1A priority Critical patent/CN115808796A/en
Publication of CN115808796A publication Critical patent/CN115808796A/en
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Abstract

The application relates to a projection system, a vehicle and a projection method. The projection system provided by the application comprises a light source module, a light source module and a control module, wherein the light source module is used for generating and emitting an illumination light beam; the image generation module is arranged on the light emitting side of the light source module, receives the illumination light beams emitted by the light source module and generates imaging light beams with image information; and the light splitting module is arranged on the light emitting side of the image generating module and is used for splitting the imaging light beams with the image information into multiple imaging light beams. The whole projection system does not need to be changed, the light path is changed by adopting an external element, and the installation and adjustment are easy. The light splitting module is used for realizing that two pictures appear in the same plane when one projection system projects, and can be matched with an external control system to simultaneously realize complex projection effects such as HMI (human machine interface), AR (augmented reality) and the like.

Description

Projection system, vehicle and projection method
Technical Field
The application relates to the technical field of projection, in particular to a projection system, a vehicle and a projection method.
Background
Along with the popularization of automobiles, road condition intersection information is more diversified and complicated, the requirement of people on a projection system of an automobile is higher and higher, and a projection system capable of coping with complicated informatization is urgently needed at present. Projection systems typically consist of an illumination section and an imaging section, the optical elements of which are typically integrated together into a complete machine mechanism.
The HUD (Head Up Display) Head-Up Display system is most widely used in the conventional projection system on the market, but the conventional HUD system has the following problems: the traditional HUD system only can use one user interface, only can project one picture in one plane, and cannot realize that a plurality of indication effects appear in the same plane; the conventional HUD system projection can only generate a classic Human Machine Interface (HMI), and the interaction information can only be a single signal (such as speed, speed limit, ADAS information, etc.).
Therefore, the projection system, the vehicle and the electronic device with the projection method provided by the application aim to solve the problems in the prior art.
Disclosure of Invention
In view of the above technical problems, an object of the present application is to provide a projection system, where the light splitting module is used to realize that two images appear in the same plane in one projection system, and the two images can cooperate with an external control system to simultaneously realize complex projection effects such as HMI and AR. One or more of the above problems and other problems with the prior art are thereby effectively solved or alleviated.
Therefore, according to a first aspect of the present application, a projection system is proposed, the projection system comprising:
a light source module for generating and emitting an illumination beam;
the image generation module is arranged on the light emitting side of the light source module, receives the illumination light beams emitted by the light source module and generates imaging light beams with image information; and
and the light splitting module is arranged on the light emitting side of the image generating module and is used for splitting the imaging light beams with the image information into multiple paths of imaging light beams.
According to some embodiments of the first aspect of the present application, an incident angle of the imaging beam with image information generated by the image generation module passing through the beam splitting module is α, an exit angle of the imaging beam with image information generated by the image generation module passing through the beam splitting module is α ', and α' satisfy: alpha < alpha' < 2 alpha.
According to some embodiments of the first aspect of the present application, the spectroscopy module is configured as a grating assembly comprising:
a grating that receives the imaging light beam with image information from the image generation module and is capable of changing a propagation direction of the imaging light beam with image information in the grating.
According to some embodiments of the first aspect of the present application, the grating has electro-optical properties that enable changing the propagation direction of the imaging light beam with image information in different operating states.
According to some embodiments of the first aspect of the present application, the grating further comprises a mirror disposed on one side of the grating and configured to reflect the imaging beam with image information back through the grating after first passing through the grating and again passing through the grating.
According to some embodiments of the first aspect of the present application, the mirror is arranged parallel to the grating and an imaging beam with image information from the image generation module is first passed through the grating.
According to some embodiments of the first aspect of the present application, the grating is configured as a holographic polymer dispersed liquid crystal element comprising a polymer and liquid crystal molecules distributed in the polymer.
According to some embodiments of the first aspect of the present application, the grating assembly further comprises a grating control system that controls the grating to switch between an on state and an off state using a voltage applied to the grating.
According to some embodiments of the first aspect of the present application, the spectroscopy module is configured as a structural block arranged at a light exit side of the image generation module.
According to some embodiments of the first aspect of the present application, the projection system further includes an imaging screen, the imaging screen is disposed on the light exit side of the light splitting module, and is configured to image multiple imaging light beams formed by the light splitting module after splitting on the imaging screen, wherein the structural block and the imaging screen are integrally configured.
According to some embodiments of the first aspect of the present application, the projection system further includes an imaging screen, the imaging screen is disposed on the light exit side of the light splitting module, and is configured to image multiple imaging light beams formed by the light splitting module after light splitting on the imaging screen, wherein the structural block is disposed in a light path between the imaging screen and the image generating module, and is separated from the imaging screen.
According to some embodiments of the first aspect of the present application, the structural block comprises a first side configured to receive an imaging light beam with image information from the image generation module; and the second side surface is arranged as the emergent side of the imaging light beam with the image information, wherein an included angle is formed between the second side surface and the first side surface.
According to some embodiments of the first aspect of the present application, the structural block is configured as an optical wedge or prism, which is arranged at the light exit side of the image generation module.
According to some embodiments of the first aspect of the present application, the structural block is configured as an optical wedge, a first side of the optical wedge is configured as a wedge surface, the wedge surface being arranged to receive the imaging light beam with the image information from the image generation module; the second side of the optical wedge is configured as a back wedge surface, which is arranged as the exit side of the imaging beam with the image information, wherein the back wedge surface and the wedge surface form a wedge angle.
According to some embodiments of the first aspect of the present application, the light splitting module is configured as a micro-structured assembly, which is arranged at the light exit side of the image generation module.
According to some embodiments of the first aspect of the present application, the microstructure assembly comprises
A carrier that is transparent to an imaging light beam with image information generated by the image generation module; and
a microstructure disposed on the carrier, wherein the microstructure is capable of changing a direction of propagation of an imaging light beam with image information generated by the image generation module.
According to some embodiments of the first aspect of the present application, at least one microstructure area is formed on the carrier, on which an imaging light beam with image information generated by the image generation module is refracted.
According to some embodiments of the first aspect of the present application, the microstructure area is constituted by a plurality of identical or different polygonal prism combinations, or the microstructure area is constituted by a plurality of identical or different lens combinations.
According to some embodiments of the first aspect of the present application, a first and a second separate microstructure area are provided on the carrier, wherein the first and the second microstructure area have different microstructures and/or refract an imaging light beam with image information generated by the image generation module to different directions.
According to some embodiments of the first aspect of the present application, the carrier is configured as a lens, a plate or a screen that is transparent to the imaging light beam with image information generated by the image generation module.
According to some embodiments of the first aspect of the present application, the projection system further comprises an imaging screen disposed on the light exit side of the light splitting module, for imaging multiple imaging beams formed by light splitting of the light splitting module on the imaging screen, wherein the microstructures are disposed on only one side of the support of the microstructure assembly, and the imaging screen is configured as the support of the microstructure assembly.
According to some embodiments of the first aspect of the present application, the projection system further includes an imaging screen, disposed on the light exit side of the light splitting module, for imaging multiple imaging light beams formed by the light splitting module after splitting on the imaging screen, wherein the microstructure component is disposed in a light path between the imaging screen and the image generating module, and separated from the imaging screen.
According to some embodiments of the first aspect of the present application, the light source module comprises one or more of the following components in combination:
a light source for generating an illumination beam;
a dimming component for optically adjusting the incident illumination beam; and
a light folding assembly for directing the optically adjusted illumination beam to the image generation module.
According to some embodiments of the first aspect of the present application, the dimming component comprises a combination of one or more of the following components:
the collimating lens is used for collimating the incident illumination light beam;
a color filter for filtering the incident illumination beam;
a correction lens for correcting the incident illumination beam; and
and the compound eye is used for homogenizing and shaping the incident illumination light beam.
According to some embodiments of the first aspect of the present application, the light redirecting assembly comprises a combination of one or more of the following components:
the relay lens is used for further shaping and homogenizing the illumination light beam;
a reflector for changing the propagation direction of the illumination beam; and
a right angle prism for directing the illumination beam to the image generation module.
According to some embodiments of the first aspect of the present application, the image generation module comprises:
and the imaging component is arranged on the light emitting side of the light source module and used for generating an imaging light beam with image information.
According to some embodiments of the first aspect of the present application, the projection system further comprises
And the projection lens is arranged on the light-emitting side of the imaging component and used for projecting the imaging light beam with the image information generated by the imaging component onto the light splitting module.
According to a second aspect of the application, a vehicle is proposed, which comprises a projection system as described above.
According to a third aspect of the present application, a projection method is proposed, the projection method comprising the steps of:
controlling the light source module to generate and emit an illumination light beam;
guiding the illumination light beam emitted by the light source module to pass through the image generation module and generating an imaging light beam with image information;
and guiding the imaging light beam with the image information to pass through a light splitting module, thereby enabling the imaging light beam with the image information to be split into multiple imaging light beams by the light splitting module.
According to some embodiments of the third aspect of the present application, the plurality of imaging beams formed by the light split by the light splitting module are imaged on an imaging screen.
Compared with the prior art, the method has the following technical effects: the whole projection system does not need to be changed, and the light path is changed by adopting an external element, so that the installation and adjustment are easy. The design of the projector does not need to be modified along with the change of the projection system, and the projector can be used universally if the required angles are the same, so that the cost is saved. The projection system has the advantages that the light splitting module is used for realizing two pictures appearing in the same plane in one projection system, and the light splitting module can be matched with an external control system to simultaneously realize complex projection effects such as HMI (human machine interface) and AR (augmented reality).
Drawings
The technical solutions of the present application will be described in further detail below with reference to the accompanying drawings and examples. In the drawings, like reference numerals are used to refer to like parts unless otherwise specified. Wherein:
FIG. 1 is a schematic block diagram of some embodiments of a projection system of the present application in which a beam splitting module is configured as a grating assembly;
FIG. 2A is a schematic diagram of an optical path of a grating assembly provided with mirrors of the projection system shown in FIG. 1;
FIG. 2B is a schematic optical diagram of an alternative embodiment of a mirror mounted grating assembly of the projection system of FIG. 1;
FIG. 2C is a schematic optical path diagram of a grating assembly of the projection system of FIG. 1 without a mirror;
FIG. 3A is a schematic diagram of the operation of the grating assembly, wherein the grating is in an open state;
FIG. 3B is a schematic diagram of the operation of the grating assembly, wherein the grating is in the closed state;
FIG. 4 is a schematic block diagram of further embodiments of projection systems of the present application, wherein the light splitting module is configured as a wedge;
FIG. 5A is a schematic diagram of the structure of the optical wedge shown in FIG. 4;
FIG. 5B is a schematic illustration of the optical path of some embodiments of the optical wedge shown in FIG. 4;
FIG. 6 is a schematic diagram of the beam splitting path of the beam splitting module;
FIG. 7 is a schematic block diagram of further embodiments of projection systems according to the present application, wherein the beam splitting module is configured as a micro-structured assembly;
fig. 8A is a schematic structural view of some embodiments of a microstructure assembly;
FIG. 8B is a schematic structural view of other embodiments of a microstructure assembly;
FIG. 8C is a schematic of the optical path of some embodiments of the microstructure assembly;
FIG. 9 is a schematic block diagram of further embodiments of projection systems according to the present application.
List of reference numerals:
1. light source module 51 grating assembly
11. Red light source 511 grating
12. Green light source 5111 liquid crystal molecule
13. Blue light source 5112 Polymer
211. Red light collimating lens 5113 first grating surface
212. Green collimating lens 5114 second Grating surface
213. Blue light collimating lens 5115 power supply
221. Red light color filter 512. Reflector
222. Green filter 52 wedge
223. Wedge surface of blue filter 521
23. Corrective lens 522. Dorsal wedge surface
24. Compound eye 53 microstructure assembly
25. Relay lens 531. Microstructured region of carrier
26. Mirror 532 first microstructure region
27. Right-angle prism 533. Second microstructure area
3. Image generation Module 534 regions of the support without microstructures
31. Imaging chip 535 carrier
4. Projection lens 536 microstructure
5. Light splitting module 6 imaging screen
Detailed Description
The technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings. It is clear that the described embodiments relate only to a part of the embodiments of the present application, and not to all embodiments. All other embodiments that can be derived by a person of ordinary skill in the art from the embodiments disclosed herein without making any creative effort shall fall within the protection scope of the present application. The terms "comprising" and "having," and any variation thereof, in the description and claims of this application are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood by those within the art that throughout the description and claims of this application, certain terms are used to indicate a position or positional relationship based on that shown in the drawings, which is for convenience only and simplicity of description, and does not indicate or imply that the referenced device, mechanism, structure or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one implementation form of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Fig. 1 is a schematic block diagram of some embodiments of a projection system of the present application. As shown in fig. 1, the projection system includes a light source module 1, an image generation module 3, and a light splitting module 5, which are sequentially arranged along an optical path. The light source module 1 is used for generating and emitting an illumination light beam. The image generation module 3 is disposed on the light emitting side of the light source module 1, wherein the image generation module 3 receives the illumination light beam emitted from the light source module 1 and generates an imaging light beam with image information. The light splitting module 5 is disposed on the light emitting side of the image generating module 3, and is configured to split the imaging light beam with image information into multiple paths or at least two paths of imaging light beams, where the split multiple paths of imaging light beams can enable the whole set of projection system to achieve various and flexible projection effects. Here, the light splitting module 5 may be configured as a grating assembly 51, and the specific structure and operation principle thereof will be described in detail later with reference to the accompanying drawings.
The light source module 1, the image generation module 3, and the light splitting module 5 constitute the projection system of the present embodiment. The light beam emitted by the light source module 1 sequentially passes through the image generating module 3 and the light splitting module 5, and then generates an image on the imaging screen 6 arranged on the light emitting side of the light splitting module 5, and by using the light splitting module 5, a plurality of paths of, for example, two paths of, independent imaging light beams can be generated, and a plurality of, for example, two images are projected on the imaging screen 6. The two parts of image projection information of the deflected imaging light beams on the imaging screen 6 can be used in cooperation with an external control system, so that various and flexible projection effects are achieved, and different application requirements can be matched.
In some embodiments of the present application, the light source module 1 may include a light source, a dimming component, and a light turning component. Wherein light sources are used for generating the illumination light beam, which light sources may for example comprise a red light source 11, a green light source 12 and a blue light source 13.
The light-adjusting component is disposed on the light-emitting side of the light source, and may include, for example, a red light collimating lens 211, a green light collimating lens 212, and a blue light collimating lens 213, which are disposed on the light-emitting sides of the red light source 11, the green light source 12, and the blue light source 13, respectively, in a color-corresponding manner, for collimating incident light beams. The light adjusting assembly further includes a red color filter 221, a green color filter 222 and a blue color filter 223, which are respectively disposed on the light emitting sides of the red collimating lens 211, the green collimating lens 212 and the blue collimating lens 213 in color correspondence, for filtering and/or combining the incident light beams. Among them, the red color filter 221 is a reverse red-through green-through blue color filter, the green color filter 222 is a reverse green-through blue color filter, and the blue color filter 223 is a reverse blue color filter.
Further, the dimming component further includes a correction lens 23 and a fly eye 24. Wherein a correction lens 23 is provided on the light-exit side of the green color filter 222 for correcting the incident illumination light beam. Specifically, the correcting lens 23 is used to correct the light in the long optical path (e.g. blue optical path) to improve the light efficiency of the whole projection system. The fly eye 24 is disposed on the light exit side of the correction lens 23, and is used for homogenizing and shaping the incident illumination light beam. The dimming component is used for optically adjusting the incident illumination light beam. After adjustment, the light source becomes more stable, and the stability of the whole light source module 1 can be improved.
The light redirecting element is disposed on the light exit side of the dimming element, for example, behind the compound eye 24 of the dimming element along the light path. The ray folding assembly includes a relay lens 25, a reflective mirror 26, and a right-angle prism 27 arranged in this order along the optical path. Further, a relay lens may be disposed between the reflective mirror 26 and the right-angle prism 27 to improve the light-folding effect of the light-folding assembly, so as to improve the projection effect of the whole projection system. By using a light folding assembly, the optically conditioned illumination beam, for example after leaving the right-angled prism 27 of the light folding assembly, is directed to the image generation module 3 for further processing.
The following describes the structure of the light source module 1 in more detail with reference to the accompanying drawings.
The light source of the light source module 1 is generally a high-brightness LED light source. Alternatively, the light source of the light source module 1 may also be other types of light source devices, such as a xenon lamp, a mercury high-pressure lamp, etc. More preferably, the light source of the light source module 1 may be a single color LED light source, that is, each LED light source generates and projects a single color light outwards.
It is worth mentioning that the light source type of the light source module 1 is not limited. The specific form of the light source module 1 is merely illustrated as an example, and can be implemented as one or a combination of a white LED light source array, a three primary color LED light source array, or other types of light sources known in the art. Other light sources suitable in the field of projection systems and in the field of illumination may be used according to the needs of practical production and implementation without departing from the scope of the present application.
It should be noted that the three-primary-color laser light source array can be set as a light source, the obtained illumination light beam has high color saturation, and the pure-color lasers of the three primary colors are mixed according to a certain proportion to obtain rich colors, so that the projection system can project a projection image with bright color and real color, and the practicability of the projection system is enhanced.
Specifically, the light source of the light source module 1 uses a three primary color laser light source array, for example, the light source of the light source module 1 further includes a red light source 11, a green light source 12 and a blue light source 13. Wherein the red light source 11, the green light source 12 and the blue light source 13 are all set as monochromatic light sources. The red light source 11 is arranged to produce red monochromatic light, the green light source 12 is arranged to produce green monochromatic light and the blue light source 13 is arranged to produce blue monochromatic light. It should be noted that the number of monochromatic light sources included in the light source module 1 is only exemplary and should not be construed as a limitation of the present application. Therefore, the number of the monochromatic light sources of the light source can also be one, two or more, and the number of the monochromatic light sources is not limited herein. In addition, it should be noted that the light source of the light source module 1 may also include other types of single-color light sources or multi-color light sources, and in the art, all light sources capable of generating light rays may be used as the light source of the light source module 1 of this embodiment.
Preferably, the plurality of light sources of the light source module 1 are arranged coplanar. In other words, the plurality of light sources of the light source module 1 may be arranged in one plane. Further, the plurality of light sources of the light source module 1 are arranged on the same horizontal straight line in the same plane. As shown in fig. 1, the red light source 11, the green light source 12, and the blue light source 13 are arranged collinearly in the same plane, and emit light in the same direction. It should be noted that, in the embodiment shown in the present application, the three light sources, i.e., the red light source 11, the green light source 12, and the blue light source 13, are not limited to the distribution shown in fig. 1, and other distribution manners such as "L" shape, equilateral triangle, etc. can be used in the present embodiment. Further, after the number of the light sources of the light source module 1 is increased, under the condition that the light sources of the light source module 1 can emit stable light, corresponding adjustment can be performed according to actual production and specific implementation requirements, and an optimal light source distribution mode is selected.
It should be noted that the LED light source itself has temperature limitation, that is, the luminous efficacy of the emitted light source changes with the temperature, and the color temperature fluctuates. In the actual use situation where the ambient temperature fluctuates greatly, the color temperature of the projection display fluctuates sharply, which adversely affects the stability of the display. The stability of the image is crucial for the practical application of the projection system. If the ratio of three color light sources is problematic, the reliability of the displayed information may be reduced. In practical use in special fields, the method can cause serious influence. For example, in a HUD system in the vehicle field, fluctuations in color temperature have a serious influence on driving safety. Therefore, in order to eliminate the influence caused by chromatic aberration, the light source of the light source module 1 may further include a heat sink, which is, for example, in heat conduction connection with the light source, thereby ensuring that the light source module 1 of the projection system described in this embodiment can operate at an appropriate temperature through reliable heat dissipation performance, and thus improving the overall stability and reliability of the projection system.
Further, the number of the heat sinks may be set to at least one. When a heat sink is disposed in the light source module 1, the heat sink may be disposed at the geometric center of the light source, so that the heat sink can simultaneously dissipate the heat of the red light source 11, the green light source 12, and the blue light source 13. When a plurality of heat sinks are provided in the light source module 1, the plurality of heat sinks may correspond to the red light sources 11, the green light sources 12, and the blue light sources 13 one to one, so that each monochromatic light source has a heat sink matching therewith. It should be noted that, the number and the positional relationship of the heat sinks are not limited, and the number and the positional relationship of the heat sinks can be properly adjusted according to the actual production and the specific implementation requirements to meet different application situations under the condition of ensuring that the heat dissipated by the light source of the light source module 1 during operation can be effectively dissipated. The setting of one or more radiators makes the projection system of this embodiment still can keep suitable temperature under high-strength work, and the imaging effect is not influenced, promotes whole projection system's high reliability and projection effect.
Further, the light source module 1 may also be provided with a light source control unit. The light source control unit may be configured as a circuit board, and is electrically connected to the light source of the light source module 1 through the circuit board to transmit a signal to the light source, so as to control the on/off of the light source. Meanwhile, the light source control unit may also be configured to control the light source and the heat sink simultaneously. The circuit board with the light source control unit may be disposed at one side of the light source and the heat sink. When the projection system works, the light source and the radiator are controlled by the light source control unit, so that the whole light source module 1 can work at a proper temperature, and the reliability and the stability of the light source module 1 are improved. Optionally, the light source control unit may also control the light source module 1 to work in cooperation with an image generation module of the projection system, so as to implement that the projection system operates in different projection modes.
The dimming component may comprise a plurality of collimating lenses. That is, the collimating lens group may be composed of a plurality of collimating lenses, and the collimating lens group composed of a plurality of collimating lenses is disposed on the light emitting side of the light source. For example, each collimating lens of the collimating lens group may correspond to one light source and collimate light beams emitted by the light source. And light beams emitted by the light source enter from one side of the collimating lens and are emitted from the other side of the collimating lens after being collimated by the collimating lens.
Alternatively, the collimating lens group in the dimming component is provided with exactly three collimating lenses, namely a red collimating lens 211, a green collimating lens 212 and a blue collimating lens 213. The three collimating lenses are respectively arranged on the emergent light paths of the red light source 11, the green light source 12 and the blue light source 13 according to corresponding colors, so that the projected light rays are collimated. Such as a red collimating lens 211, a green collimating lens 212, and a blue collimating lens 213 as shown in fig. 1. The red light collimating lens 211 is disposed on a light emitting side of the red light source 11, and is configured to collimate an incident red light beam. The green collimating lens 212 is disposed on the light emitting side of the green light source 12 for collimating the incident green light beam. The blue light collimating lens 213 is disposed on the light emitting side of the blue light source 13, and is used for collimating the incident blue light beam.
The collimating lenses in the collimating lens group are used for collimating the projected light, and the number of the collimating lenses is not limited to three. In addition, the collimating lens in the collimating lens group can also adopt a single larger collimating lens, so that the single collimating lens can collimate the incident light of all the light sources, the light emitted by all the light sources is ensured not to be deflected after passing through the collimating lens, and the imaging quality and the reliability of the projection system are improved. Alternatively, the collimating lens may also be configured as a plurality of smaller collimating lenses, such that each smaller collimating lens corresponds to a plurality of light sources in the light source module 1. As shown in the embodiment of fig. 1, each of the light sources and its corresponding collimating lens are configured as a set of light sources. For example, the red collimating lens 211 may be disposed on the light emitting side of the red light source 11 for collimating the incident red light beam. The green collimating lens 212 is disposed on the light emitting side of the green light source 12 for collimating the incident green light beam. The blue light collimating lens 213 is disposed on the light emitting side of the blue light source 13, and is used for collimating the incident blue light beam. The arrangement mode of the collimating lenses and the light sources in one-to-one correspondence enables the arrangement of the light source modules 1 to be tighter, reduces the volume of the light source modules 1, is beneficial to the miniaturization of a projection system, enables the projection system to have wider application scenes in practical production application, and meets more application requirements.
The dimming component may include a color filter. The color filter is arranged on the light-emitting side of the collimating lens group and is used for filtering incident illumination light beams. In some embodiments of the present application shown in fig. 1, the color filter is configured as three color filters that filter different colors, a red color filter 221, a green color filter 222, and a blue color filter 223, respectively. The red color filter 221, the green color filter 222, and the blue color filter 223 are each obliquely directed toward a collimating lens of a corresponding color. Through the structure arrangement, the whole structure of the light source module 1 of the projection system is compact, so that the miniaturization of the projection system is facilitated, and the actual production and application requirements are facilitated.
It is understood that the color filters correspond one-to-one to the monochromatic light sources of the light source. Wherein the order of the monochromatic light source and the color filter can be interchanged without affecting the filtering effect of the color filter. Accordingly, the location of the color filters and the order of the locations of the individual monochromatic light sources of the light source are provided herein by way of example only and not by way of limitation.
It should be noted that, in the embodiment shown in fig. 1, only the position relationship of the color filter in the plan view is shown, and the sectional shape, the thickness, and the like of the color filter are not limited. Those skilled in the art will appreciate that a color filter having a certain thickness in a cross section such as a square shape, a circular shape, etc., which satisfies a color filtering effect, may be constructed as the color filter of the present embodiment.
In some embodiments of the present application, the dimming component may further include a correction lens 23 disposed at the light exit side of the color filter and for correcting the incident illumination light beam. The correcting lens 23 can correct the light beam, so that the light beam entering the fly eye 24 before entering the light-entering side is in a straight line, and the imaging quality of the light source module 1 of the projection system is ensured.
It should be noted that one or more corrective lenses 23 can be provided in the projection path of the light beam, according to the actual production and implementation requirements, so as to make the imaging quality of said light beam higher. The layout position of the correction lens 23 is not limited to the position obliquely placed to the color filter as shown in fig. 1, as long as it is sufficient to correct the light beam and to arrange it on the projection optical path of the light beam.
In some embodiments of the present application, the dimming component may further include a compound eye 24 disposed on the light exit side of the correction lens 23 and configured to homogenize and shape the incident illumination beam. The compound eye 24 has wide application prospect in the fields of micro-displays and projection displays. The fly eye 24 is configured as a fly eye lens, and is formed by a series of small lens combinations, and each beam of incident parallel light is converged, so that higher light energy utilization rate and more area uniform illumination can be obtained.
The fly-eye lens has a plurality of sub-lenses. The sub-lenses are completely the same, the distances between the sub-lenses are also completely the same, and the sub-lenses can independently and independently transmit the light beams, so that the light beams can obtain more uniform effect after passing through the fly-eye lens. In the present embodiment, the shape of the plurality of sub-lenses of the fly-eye lens is set to a circular shape. The shape of the sub-lenses of the fly-eye lens may be a rectangular shape. The shape of the sub-lenses of the fly-eye lens is not particularly limited, and sub-lenses of other shapes may be selected according to the needs of actual production and specific implementation. In a case where the sub-lenses are identical and the distances therebetween are identical, the size of the projected image may be adjusted by adjusting the focal length of each sub-lens of the fly-eye lens. In the embodiment shown in fig. 1, the light beam passes through the compound eye 24 and then is projected to the light turning component of the light source module 1, and the light turning component receives the illumination light beam emitted from the light emitting side of the compound eye 24 and further processes the illumination light beam.
The light redirecting assembly may include a relay lens 25 disposed on the light exit side of the dimming assembly for further shaping and homogenizing the illumination beam, a reflector 26 disposed on the light exit side of the relay lens 25 for changing the propagation direction of the illumination beam, and a rectangular prism 27 disposed on the light exit side of the reflector 26 for directing the illumination beam to the image generation module 3.
In the embodiment of the present application shown in fig. 1, the relay lens 25 is disposed between the fly eye 24 and the reflective mirror 26. It should be noted that the relay lens 25 is arranged to further shape the light beam so as to output a uniform collimated light beam, thereby improving the projection imaging quality of the dynamic projection system. It will be appreciated by those skilled in the art that other lenses capable of producing the same or better imaging effect can be disposed between the dimming component and the reflective mirror 26, so that the light source projected by the light source module 1 of the whole projection system is more stable and better.
It should be noted that, in the embodiment shown in fig. 1, only the position relationship of the relay lens 25 in the plan view is shown, and the sectional shape, the thickness, and the like of the relay lens 25 are not limited. Those skilled in the art will appreciate that a cross section of the relay lens 25, such as a square, a circle, etc., having a certain thickness, which can satisfy the same or better imaging effect, may be configured as the relay lens 25 of the present embodiment.
In some embodiments of the present application shown in fig. 1, the light beam further shaped and homogenized by the relay lens 25 is incident on a mirror 26 of the light folding assembly. A mirror 26 is provided on the light exit side of the relay lens 25 for changing the propagation direction of the illumination light beam. Here, the illumination light beam is changed in irradiation direction by the mirror 26 and then reflected to the light entrance side of the rectangular prism 27. The right-angle inclined plane of the right-angle prism 27 is the light incident side of the illumination light beam, and the right-angle prism 27 changes the deflection angle of the illumination light beam after receiving the illumination light beam, and refracts the illumination light beam to the image generation module 3 for imaging.
As shown in fig. 1, after the light beam is reflected by the reflective mirror 26, a right-angle prism 27 is required to adjust the incident angle of the light beam, so that the light beam can be incident to the image generation module 3. However, it should be noted that the present embodiment is not limited to the use of only the right-angle prism 27, and other optical elements such as a prism that can achieve the same effect may be used.
The light beam is shaped and homogenized by the light turning component of the light source module 1, and then is projected to the image generation module 3. The image generation module 3 may comprise an imaging assembly for generating an imaging beam with image information.
The imaging assembly includes, for example, an imaging chip 31 and a chip control unit. The imaging chip 31 may be one of a DMD, an LCOS, and a MEMS. Preferably, the imaging chip 31 is configured as a DMD chip. The DMD chip is an integrated micro-electro-mechanical system, and the service life can reach more than 10 years. A DMD is formed by a plurality of tiny mirrors, each corresponding to a pixel of the generated image, closely arranged in rows and columns attached to an electrical node of a silicon wafer. The construction of a DMD chip typically includes three parts, electronic circuitry, mechanical and optical. The electronic circuit part is a control circuit, the mechanical part is a structure part for controlling the rotation of the lens, and the optical part is a lens part. When the DMD chip works normally, the light beam passes through the DMD chip, the tiny rotatable lens fully distributed on the surface of the DMD chip reflects the light beam through rotation, and the rotation of each lens is controlled by a circuit. The DMD chip is made of pure semiconductors and metal materials, and is extremely high in stability due to the special electronic mechanical design. Image information for projection is loaded on the DMD chip. The light beam passing through the light ray adjusting mechanism carries image information while being reflected by the DMD chip.
It is noted that in the schematic diagram shown in fig. 1, the position of the imaging chip 31 of the image generation module 3 is only schematically indicated. In practical production applications, the imaging chip 31 may be connected to other external control circuits according to actual needs, so as to control the projected image of the overall projection system.
It should be noted that the projection system further includes a projection lens 4 disposed on the light exit side of the imaging component. The imaging chip 31 generates an image to be projected under the control of the chip control unit. After the imaging chip 31 receives the illumination beam projected by the light source module 1, an imaging light beam with image information is generated and projected to the projection lens 4, and the imaging light beam with image information generated by the imaging component is projected onto the light splitting module 5 through the projection lens 4.
It should be noted that the imaging assembly may further include one or more image element regions for generating an imaging beam with image information, and the image element regions generate the imaging beam with image information and project the imaging beam to the projection lens 4. Further, when the two pixel areas are set, the two pixel areas respectively generate different imaging light beams with image information, and the different imaging light beams with image information are respectively projected to the projection lens 4.
It should be noted that the projection lens 4 may be configured as one or more of an aspheric lens, a spherical lens and a free-form lens. Aspherical lenses are characterized by a continuous change in curvature from the center of the lens to the periphery. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and astigmatism aberration. Therefore, an aspherical mirror is preferable, which can eliminate aberration occurring at the time of imaging as much as possible, thereby improving the imaging quality of the projection lens 4. It should be noted that the projection lens 4 is not limited to the combination of a spherical mirror and an aspherical mirror, and different lens combinations can be adopted to meet the actual requirements.
It should be noted that when the imaging light beam with image information generated by the image generating module 3 passes through the light splitting module 5, the exit angle of the imaging light beam changes due to different components selected by the light splitting module 5, specifically, when the grating component 51, the structural block or the microstructure component 53 are respectively selected, the imaging light beam reflects or deflects at different angles. It is worth pointing out that the incident angle of the imaging light beam with image information generated by the image generation module 3 passing through the light splitting module 5 is α, the exit angle of the imaging light beam with image information generated by the image generation module 3 passing through the light splitting module 5 is α ', and α' satisfy: alpha < alpha' < 2 alpha. The incident angle alpha and the emergent angle alpha' are set in such a way, so that the reflection or deflection angle of the imaging light beam is smaller, the energy loss can be reduced, the brightness of the image at the reflection or deflection position can be improved, and the imaging effect of the image is ensured.
Fig. 2A is a schematic diagram of an optical path of a grating assembly provided with a mirror of the projection system shown in fig. 1. As shown in fig. 2A, the grating assembly 51 may include a grating 511 and a mirror 512 for reflecting light passing through the grating 511. The grating 511 receives the imaging light beam with image information from the image generation module 3, and can change the propagation direction of the imaging light beam with image information in the grating 511. The mirror 512 is disposed on one side of the grating 511, and reflects the imaging beam with image information back after first passing through the grating 511 and passes through the grating 511 again. The grating 511 and the mirror 512 are, for example, parallel to each other and are constructed as a whole by, for example, a bonding process or the like.
The grating assembly 51 includes a grating 511 and a mirror 512. Wherein the grating 511 comprises a first grating face 5113 and a second grating face 5114 opposite the first grating face 5113. The first grating surface 5113 is a side away from the mirror 512, and the second grating surface 5114 is a side close to the mirror 512. A solid line G1 with an arrow in the figure indicates an optical path in which a light ray passing through the grating 511 is substantially not deflected, a broken line G2 with an arrow in the figure indicates an optical path in which a light ray passing through the grating 511 is deflected, and a broken line without an arrow in the figure indicates a normal line perpendicular to both the first grating face 5113 and the second grating face 5114. The image beam from the image generation module 3 with the image information is transmitted through the first grating face 5113 of the grating 511 and enters the grating 511, and then exits the grating 511 through the second grating face 5114 of the grating 511 and is projected onto the reflection face of the mirror 512. Then, after the light is reflected by the reflection surface of the mirror 512, the light is again incident into the grating 511 through the second grating surface 5114 of the grating 511, and then exits from the grating 511 through the first grating surface 5113 of the grating 511.
It should be noted that the grating 511 has electro-optical characteristics, and by means of the electro-optical characteristics, the grating 511 can have different operation states. The direction of propagation of the imaging beam with image information can be deflected to different degrees, or not at all, in different operating states of grating 511, which may depend on the specific setting of the electro-optical properties of grating 511.
For example, the grating 511 may include two states, on and off. When the grating 511 is in the on state, the imaging light beam with the image information propagates in a straight line in the grating 511, and basically no deflection occurs. As shown by a (solid line) light ray G1 in fig. 2A, the imaging light beam with image information generated by the image generation module 3 passes through the first grating surface 5113 and the second grating surface 5114 of the grating 511, is projected onto the reflection surface of the mirror 512, is reflected by the reflection surface of the mirror 512, and then sequentially passes through the second grating surface 5114 and the first grating surface 5113. During the two passes of the imaging beam through the grating 511, the imaging beam with the image information is not substantially refracted, i.e. its propagation direction is not changed by the grating 511.
It should be noted that, in the schematic optical path diagram of fig. 2A, for the sake of clarity, the refraction effect of the light G1, which may be caused by the material property of the grating 511 when it is in the on state, is not shown, and is negligible with respect to the refraction effect of the light due to the electro-optical property when the grating 511 is in the off state.
When the grating 511 is in the off state, the imaging beam with the image information is refracted in the grating 511. As shown by a (dotted line) light ray G2 in fig. 2A, the imaging light beam with image information generated by the image generation module 3 passes through the first grating surface 5113 and the second grating surface 5114 of the grating 511, is projected onto the reflection surface of the mirror 512, is reflected by the reflection surface of the mirror 512, and then sequentially passes through the second grating surface 5114 and the first grating surface 5113. During the two passes of the imaging beam through the grating 511, the imaging beam with the image information is refracted, i.e. the propagation direction is changed by the grating 511. Thus, the imaging beam exiting the grating 511 when the grating 511 is in the off state has a significant deflection angle, i.e., changes the direction of propagation, compared to the imaging beam exiting the grating 511 when the grating 511 is in the on state.
The mirror 512 is used for receiving the imaging beam with image information and passing through the grating 511 for reflection. The mirror 512 is preferably arranged parallel to the grating 511, and the imaging beam with image information from the image generation module 3 first passes directly through the grating 511, then passes through the grating 511 again after being reflected by the mirror 512. Note that the material, shape, and the like of the mirror 512 of the grating unit 51 are not particularly limited. It is conceivable that equally effective reflecting elements can be arranged at this location, which function to reflect the imaging light beam with the image information. It should be noted that the reflecting mirror 512 is not limited to be parallel to the first grating face 5113 or the second grating face 5114 of the grating 511, and may be adjusted in position according to actual situations, and may be set at a best suitable position, for example, obliquely arranged with respect to the first grating face 5113 or the second grating face 5114 of the grating 511, so as to present an optimal imaging effect.
It should be noted that according to other embodiments of the present application, the grating assembly 51 may also include only the grating 511. That is, the grating assembly 51 does not necessarily include the mirror 512 of the embodiment shown in FIG. 2A. In the case where the mirror 512 is not provided, the desired light splitting effect can be achieved by appropriately setting the electro-optical characteristics of the grating.
FIG. 2B is a schematic optical path diagram of another embodiment of a mirror mounted grating assembly of the projection system of FIG. 1. A solid line G with an arrow in the figure indicates an incident light path of the light incident grating member 51. A solid line G1 with arrows in the figure indicates a light path in which light is reflected directly without being substantially deflected when passing through the grating 511. The dashed line G2 with an arrow in the figure is an optical path indicating that the light is deflected when passing through the grating 511. The dotted line without an arrow above the grating 511 in the figure is a normal line perpendicular to the first grating face 5113, and the dotted line without an arrow below the grating 511 in the figure is a normal line perpendicular to the mirror 512. The image beam with image information from the image generation module 3 is transmitted through the first grating face 5113 of the grating 511 and enters the grating 511 at an incident angle α.
When the grating 511 is in the on state, the light path is as shown by the light ray G1 (solid line) in fig. 2B, i.e. the propagation direction of the light ray G1 is not changed by the grating 511, and the light ray G1 is not deflected and has an exit angle α 1 。
When the grating 511 is in the closed state, the imaging light beam with image information is refracted during the process that the imaging light beam passes through the grating 511 twice, that is, the propagation direction is changed by the grating 511. Thus, the grating 511 is openedCompared with the imaging light beam leaving the grating 511 in the on state, when the grating 511 is in the off state, the imaging light beam leaving the grating 511 has an obvious deflection angle, that is, the propagation direction is changed, at this time, the light ray G2 is deflected, and the exit angle thereof is alpha 2 。
In addition, α is 1 Is the exit angle alpha of the imaging light beam with image information generated by the image generation module 3 passing through the grating 511 without deflection 2 Is the emergent angle of the image beam with image information generated by the image generation module 3 deflected by the grating 511, and is alpha 1 And alpha 2 Satisfies the following conditions: alpha is alpha 1 ＜α 2 ＜2α 1 。α 1 And alpha 2 By the setting, the deflection angle of the imaging light beam is small, energy loss can be reduced, and the brightness of an image at the deflection position can be ensured.
In the present embodiment, the mirror 512 is disposed non-parallel to the grating 511, and the mirror 512 and the grating 511 are inclined at an angle β. When the grating 511 is in the off state, the imaging light beam with the image information is refracted in the grating 511. As shown by a (dotted line) light ray G2 in fig. 2B, the imaging light beam with image information generated by the image generation module 3 passes through the first grating surface 5113 and the second grating surface 5114 of the grating 511, is projected onto the reflection surface of the mirror 512, is reflected by the reflection surface of the mirror 512, and then sequentially passes through the second grating surface 5114 and the first grating surface 5113. Thus, it is achieved that the exit directions of both light rays G1 and G2 are different, i.e. the exit angle α of the light ray G1 1 The exit angle alpha with the ray G2 2 Not equal. Because the emergent directions of the light rays G2 and G1 emitted by the grating are different, the phenomenon of pixel facula displacement can be generated, and the effect of projecting two pattern pictures can be achieved.
It should be noted that the exit angle α of the light ray G2 is preferably 2 The angle range of the angle is more than or equal to alpha of 10 degrees 2 The angle range of the incidence angle alpha is more than or equal to 5 degrees and less than or equal to 25 degrees, and the angle range of the inclination angle beta of the reflecting mirror 512 and the grating 511 is more than or equal to 5 degrees. The reflector 512 is arranged to be connected withWhen the gratings 511 are not parallel, the angles of the light rays satisfy the following relationship that alpha = alpha 1 ；α 2 ＝α 1 +β。
Therefore, when the reflector 512 is not parallel to the grating 511, the angle of the incident light and the angle of the emergent light satisfy the above relationship, and in practical production and application, the angle can be adjusted appropriately according to specific use conditions to satisfy other complicated and tedious conditions. Note that when the mirror 512 is disposed not parallel to the grating 511, the material, shape, and the like of the mirror 512 of the grating assembly 51 are also not particularly limited. It is conceivable that equally effective reflecting elements can be arranged at this location, which function to reflect the imaging light beam with the image information.
FIG. 2C is a schematic diagram of an optical path of a grating assembly of the projection system of FIG. 1 without a mirror. As shown in fig. 2C, the grating assembly 51 may include a grating 511. The grating 511 receives the imaging light beam with image information from the image generation module 3, and can change the propagation direction of the imaging light beam with image information in the grating 511. Wherein the grating 511 comprises a first grating face 5113 and a second grating face 5114 opposite the first grating face 5113. A solid line G1 with an arrow in the figure indicates an optical path in which a light ray passing through the grating 511 is substantially not deflected, a broken line G2 with an arrow in the figure indicates an optical path in which a light ray passing through the grating 511 is deflected, and a broken line without an arrow in the figure indicates a normal line perpendicular to both the first grating face 5113 and the second grating face 5114. The imaging beam from the image generation module 3 with the image information is transmitted through the first grating surface 5113 of the grating 511 and enters the grating 511, the propagation direction of which is changed or not changed in the grating 511, depending on whether the grating 511 is in the closed state or the open state, and finally exits from the second grating surface 5114 to the imaging screen 6.
It should be noted that the grating 511 in the embodiment shown in fig. 2C is the same as the grating 511 in the embodiment shown in fig. 2A in terms of both the electro-optical characteristics and the operation principle, and the technical features described with reference to the embodiment shown in fig. 2A are also applicable to the embodiment shown in fig. 2C, and are not repeated herein.
In the schematic view of the operating principle of the grating 511 shown in fig. 3A and 3B, the grating 511 is configured as a Holographic Polymer Dispersed Liquid Crystal element HPDLC (Holographic Polymer Dispersed Liquid Crystal). The holographic polymer dispersed liquid crystal cell includes a polymer 5112 and liquid crystal molecules 5111 distributed in the polymer 5112. Further, the grating 511 further comprises a grating control system. The grating control system includes a power supply 5115 for supplying power to the grating 511. The raster control system switches the raster 511 between an on state and an off state by controlling the power supply 5115.
FIG. 3A is a schematic diagram of the operation of the grating assembly, wherein the grating is in an open state. As shown in fig. 3A, when the grating 511 is in the on state, the switch of the power supply 5115 line of the grating control system is closed, the power supply 5115 of the grating control system applies a voltage to the HPDLC element, and the grating 511 is in the on state. At this time, the director of the liquid crystal molecules 5111 of the grating member 51 is aligned along the electric field, the refractive indexes of the liquid crystal molecules 5111 and the polymer 5112 become almost identical, and the incident light G1 penetrates almost linearly without changing the traveling direction, i.e., the grating 511 is substantially transparent to the light in this state.
FIG. 3B is a schematic diagram of the operation of the grating assembly, wherein the grating is in the closed state. As shown in fig. 3B, when the grating 511 is in an off state, the switch of the power supply 5115 line of the grating control system is turned off, the power supply 5115 of the grating control system does not apply a voltage to the HPDLC element, and the grating 511 is in an off state. At this time, the director vector of the liquid crystal molecule 5111 is disordered, the difference in refractive index between the liquid crystal molecule 5111 and the polymer 5112 generates an optical diffraction phenomenon, and the incident light G2 is deflected by the holographic polymer dispersed liquid crystal device by an angle θ, so that the emergent direction is different from the incident direction. The incident light G2 changes the traveling direction, that is, when the light beam sequentially passes through the first grating face 5113 and the second grating face 5114, an angular deflection occurs.
Specifically, as shown in FIG. 3B, when the grating 511 is in the OFF state, i.e. refraction between the liquid crystal molecules 5111 and the polymer 5112When the difference causes the light diffraction phenomenon to form an "off" state, the incident light is deflected by the holographic polymer dispersed liquid crystal element by an angle θ. Alpha is alpha 3 Is the angle of incidence of the incident light, alpha 4 Is the angle of deflection, alpha, generated after the light passes through the liquid crystal molecules 5111 of the first grating surface 5 Is the exit angle, α 6 Angle α before light ray exits through liquid crystal molecules 5111 7 Is the angle at which the light rays are deflected after passing through the polymer 5112 of the first grating face. Under the condition that no voltage is applied to the grating 511, the refractive indexes of the liquid crystal molecules 5111 and the polymer 5112 are different, the refractive index of the liquid crystal molecules 5111 is n1, the refractive index of the polymer 5112 is n2, n1 and n2 satisfy 1.5-1.9, and n1 is not equal to n2. Incident ray alpha 3 Alpha is more than or equal to 5 degrees 3 Not more than 25 degrees and the deflection angle theta satisfies that theta is not less than 10 degrees. When the grating 511 is in the off state, the angle of the light and the refractive index should satisfy the following relationship: θ = α 5 +α 6 ；sinα 3 ＝n1sinα 4 ；n1sinα 4 ＝n2sinα 7 ；n1sinα 6 ＝sinα 5 。
Therefore, the grating 511 is changed in refractive index by controlling the voltage applied to the grating 511 by the power supply 5115 through the grating control system, so that the grating 511 is switched between an on state and an off state, thereby achieving the effect of splitting the imaging light beam with image information into multiple light beams.
It is noted that the raster control system may be further configured to perform zone control of the raster 511. It is preferably contemplated that the grating 511 is configured to include a plurality of grating regions, such as a first grating region and a second grating region. The plurality of grating regions can receive and deflect the imaging light beam with image information at different angles. The grating control system may apply different voltages to the plurality of grating regions, so that different grating regions may have different refractive indices, thereby achieving different deflection angles of the imaging beam, i.e. splitting in different directions. It should be noted that fig. 1 only shows the light splitting function of the grating 511, and the grating assemblies 51 of the light splitting module 5 can be configured or arranged reasonably according to the actual production and specific implementation requirements. For example, the grating control system is configured to control a plurality of grating regions, which correspond to one or more mirrors 512, for example, so that the same imaging beam with image information can be deflected by different angles through different grating regions of the grating 511, thereby the whole projection system has more flexible and various imaging effects.
It should be noted that the imaging chip of the image generation module 3 may include one or more image element areas for generating imaging light beams with image information, the image element areas may respectively generate one imaging light beam with image information, and the generated one or more imaging light beams are respectively projected to a corresponding image element area of the grating 511 through the projection lens 4.
For example, when the two picture element regions are provided, the two picture element regions generate different imaging light beams with image information, respectively, and the different imaging light beams with image information are provided as the first imaging light beam and the second imaging light beam. The first and second imaging beams may correspond to a grating region of the grating 511, respectively. For example, the first imaging beam corresponds to the first grating region, i.e., the first imaging beam is angularly deflected via the first grating region of the grating 511. The second imaging beam corresponds to the second grating region, i.e., the second imaging beam is angularly deflected via the second grating region of the grating 511.
So set up, can make the different images that a plurality of pixel regions of image generation module generated image respectively via the different regions of grating, a plurality of light beams that have image information take place the deflection of different angles, whole projection system can obtain more nimble, various formation of image effect from this, whole projection system's suitability is higher.
It is noted that the grating control system may be arranged to switch the switching state of the grating 511 at high frequency. The arrangement is such that the grating 511 is frequently switched between on and off states in a very short time. The imaged image with image information is imaged on the retina and input into the human brain by the optic nerve, so that the human brain perceives the imaged image with image information. However, when the operating state of the grating 511 is switched at a high frequency, the impression of the object by the optic nerve does not disappear immediately, but lasts for a period of 0.1-0.4 seconds, a property known as the "persistence of vision" effect. Due to the "persistence of vision" effect, the grating 511 switches at high frequency between the on and off states in a very short time (e.g., 0.1-0.4 seconds) to simultaneously present two images in the human brain. I.e. the rays G1 and G2 in fig. 1 are received by the human brain almost simultaneously, i.e. both images can be seen to appear on the imaging screen 6 almost simultaneously.
It should be noted that the liquid crystal molecules 5111 and the polymers 5112 in the grating 511 described in this embodiment are not limited to a specific material, and liquid crystal molecules 5111 and polymers 5112 of other materials that can achieve the deflecting effect of the grating 511 may be used in the art. In addition, the electro-optic properties of the grating 511 can be altered by replacing the polymer 5112 in the grating 511 with other suitable polar liquid crystal molecules. After replacement with suitably polar liquid crystal molecules, the grating 511 may be made to be able to deflect the light beam passing through the grating 511, for example, with a voltage applied, and not deflect the light beam passing through the grating 511, with no voltage applied.
Further, in the grating assembly 51, a grating control system is provided as a circuit connection, and the power supply 5115 controls the on-off state of the grating 511 through the circuit connection. Alternatively, other connection methods capable of controlling the on/off state of the grating 511 are also applicable, such as wireless switch control.
It is worth pointing out that the light splitting module may also be configured as a structural block, which is arranged at the light exit side of the image generating module. Wherein the construction block comprises a first side arranged to receive an imaging light beam with image information from said image generation module 3; and the second side surface is arranged as the emergent side of the imaging light beam with the image information, wherein an included angle is formed between the second side surface and the first side surface.
Further, fig. 4 is a schematic structural diagram of other embodiments of the projection system of the present application, wherein the light splitting module 5 is configured as an optical wedge 52 disposed at the light exit side of the image generation module 3. The optical wedge 52 has a first side, which is configured as a wedge surface 521, and a second side, which is configured as a back wedge surface 522. Wherein the wedge surface 521 is arranged as a surface for receiving the imaging light beam with image information from said image generation module 3. Opposite the wedge surface 521 is a back wedge surface 522, the back wedge surface 522 being arranged to the exit side of the imaging light beam with image information. Wherein the back wedge surface 521 and the wedge surface 521 form a wedge angle, that is, the wedge surface 521 and the back wedge surface 522 of the optical wedge 52 are disposed as two non-parallel surfaces. In the illustrated embodiment, the optical axis of the illumination beam may be perpendicular to the back wedge surface 522, so that the illumination beam is not perpendicular to the incident wedge surface 521, but has a certain incident angle. Therefore, as shown in the schematic structural diagram of fig. 4, the thicknesses of the optical wedges 52 at different positions are different, that is, the folding angles of the imaging beams with image information at different positions are also different, so that the light rays are deflected at different angles, that is, as shown by light rays L1 and L2 in fig. 4.
The projection system may further include an imaging screen 6 disposed on the light exit side of the light splitting module 5, and configured to image multiple imaging light beams formed by light splitting of the light splitting module 5 on the imaging screen 6. A separate imaging screen may be provided for each of the multiple imaging beams formed by splitting, or a common imaging screen 6 may be provided. It is possible that the imaging screen itself can be designed as a screen carrier for the projection imaging, but also as other optical components that can influence the imaging beam, for example as a glass screen that can be transparent to the imaging beam or as a diffuser screen.
In some embodiments of the present application, the spectroscopy module 5 and the imaging screen 6 may be constructed integrally. In particular, the wedge 52 or prism may be constructed integrally with the imaging screen 6. Alternatively, the wedge 52 or the prism can be machined directly into the imaging screen 6, i.e. the wedge 52 or the prism is formed directly from the material of the imaging screen 6 itself. Alternatively, the wedge 52 or prism can be manufactured separately and attached to the imaging screen 6. For example, wedge optic 52 may be secured to the imaging screen 6 with its back wedge surface 522. The optical wedge 52 can be fixed on the imaging screen 6 by means of a snap-in, screw-in, or adhesive connection. In this embodiment, it is preferably ensured that the wedge 52 can be firmly fixed to the imaging screen 6 by means of an adhesive type of connection. By means of the wedge optics 52, it is fixed to the imaging screen 6 by means of a rear wedge surface 522. By the measures, the number of elements of the whole projection system can be reduced, the projection system is easy to assemble, and meanwhile, the stability of the whole projection system is improved.
In other embodiments of the present application, the wedge optic 52 may be constructed separately from the imaging screen 6, see, for example, FIG. 5A. Wherein an optical wedge 52 is arranged in the optical path between said imaging screen 6 and said image generating module 3, and is separated from the imaging screen 6. It should be noted that the distance between the wedge surface 521 or the back wedge surface 522 of the optical wedge 52 and the imaging screen 6 is not limited. When the wedge optic 52 is constructed separately from the imaging screen 6, the wedge optic 52 may also include a wedge moving assembly. The wedge moving assembly mechanically fixes the wedge 52 and allows the wedge 52 to move between the imaging screen 6 and the image generation module 3. By arranging in this way, the optical wedge 52 can be adjusted accordingly according to the size and effect to be imaged in the practical application of the projection system, and the high usability of the whole projection system is improved.
It should be noted that fig. 5B is a schematic optical path diagram of some embodiments of the optical wedge shown in fig. 4. The imaging beam with image information generated by the image generation module 3 has an incident angle I through the optical wedge 52 1 The exit angle of the imaging beam with image information generated by the image generation module 3 passing through the optical wedge 52 is I ″ 1 And the incident angle and the exit angle satisfy: i is 1 ＜I″ 1 ＜2I 1 . The angle is so set up for the formation of image light beam deflection angle is less, can enough reduce energy loss, can promote the luminance of deflection department image again, guarantees the formation of image effect of image.
As shown in FIG. 5B, the refractive index of wedge 52 is n, which satisfies 1.5. Ltoreq. N.ltoreq.1.9. The wedge angle formed by the two refractive surfaces of wedge 52, i.e., wedge surface 521 and back wedge surface 522, is epsilon. Incident angle of light is I 1 Wedge passing through optical wedge 52The angle after the deflection of the face 521 is I' 1 . The angle between the emergent ray and the incident ray after the ray passes through the optical wedge 52 is delta, and the range of delta is more than or equal to 5 degrees. In order to make the image generated by the image generation module 3 have good effect, the projection angle of the whole projection system can be set to 10-50 degrees, and then the light ray incident angle I is 1 The angle range to be set is more than or equal to I of 5 degrees 1 Is less than or equal to 25 degrees. And since the wedge angle epsilon of the wedge is small, the wedge surface 521 and the wedged surface 522 of the wedge 52 can be approximately parallel plates. Thus, by replacing the corresponding sine value with its arc value, the angle δ between the outgoing ray and the incoming ray after the ray passes through the wedge 52 is calculated as follows:
Figure BDA0003266534450000221
sinI 1 ＝nsinI′ 1 。
it should be noted that in the structural schematic diagrams shown in fig. 4, fig. 5A and fig. 5B, the light splitting module 5 is configured as an optical wedge 52. The typical material used for the wedge 52 is N-BK7, which is a common borosilicate crown glass designed for a variety of visible light applications, and therefore the material selected for this embodiment is N-BK7, although other materials that achieve the same or better results may be selected.
In other embodiments, the wedge 52 element may be replaced with a prism or lens having the same imaging effect. The features described above with reference to wedge 52 are equally applicable to prisms or lenses. For example, the prism may be constructed as a unitary structure with the imaging screen 6, facilitating assembly of the projection system. The prism can also be designed separately from the imaging screen 6, and the prism can be set to be capable of moving between the imaging screen 6 and the image generation module 3, so that the size and the effect of imaging can be adjusted in the application of the projection system according to the requirements of actual production and specific application, and the high availability of the whole projection system is improved. It should be noted that the prism may be configured as a triangular prism, a pentaprism, or other suitable polygonal prisms.
Fig. 6 is an exemplary spectroscopic optical path diagram of the spectroscopic module. As shown in fig. 6, two parallel broken lines L11 and L21 are optical paths in the case where the light is not deflected during projection, that is, the broken lines L11 and L21 are original incident light, and L11 and L21 are projected in parallel to the imaging screen 6.
On the light path of the incident light beams L11 and L21 that are emitted to the imaging screen 6, the beam splitting module 5 adjusts and deflects the angles of the incident light beams L11 and L21, so that the incident light beams change the original propagation direction, that is, after the two dotted lines L11 and L21 shown in the figure are deflected, the solid lines L1 and L2 in the figure are respectively generated.
Solid lines L1 and L2 are actual optical paths of the imaging light beam with image information. An included angle formed between an optical path after the L11 deflection, namely a solid line L1, and an original optical path, namely a broken line L11, is a first deflection angle theta 1 The included angle formed between the optical path after L21 deflection, i.e. the solid line L2, and the original optical path, i.e. the dashed line L21, is a second deflection angle theta 2 . Thus, the incident light is deflected by different angles, for example, a first deflection angle θ, before being projected onto the imaging screen 6 1 Greater than a second deflection angle theta 2 So that the imaging beam is split into two separate imaging beams, for example, and two projections of the image are formed on the imaging screen 6. The two partial image projection information of the deflected imaging beam appearing on the imaging screen 6 can be used in conjunction with an external control system, for example to achieve a complex, stereoscopic projection effect such as HMI, AR, etc.
Fig. 7 is a schematic structural diagram of other embodiments of the projection system of the present application, wherein the light splitting module 5 is configured as a microstructure assembly 53 disposed on the light exit side of the image generation module 3. The microstructure assembly 53 includes a carrier 535 and microstructures 536 disposed on the carrier 535. Wherein the imaging beam with image information generated by the image generation module 3 can directly transmit through the carrier 535. That is, the carrier 535 is transparent to light, which travels in a straight line in the carrier 535. Microstructures 536 are arranged on the carrier 535, wherein the microstructures 536 are capable of changing the propagation direction of the imaging light beam with image information generated by the image generation module 3.
The carrier 535 may be configured as a lens, a plate or a screen that is transparent to the imaging light beam with image information generated by the image generation module 3. The microstructures 536 can be fixed to the carrier 535 by means of a snap-fit, a screw-fit, an adhesive, etc. Alternatively, microstructures 536 may be integral with carrier 535, e.g., microstructures 53 may be configured as regions of carrier 535 having particular surface structures and optical properties.
Fig. 8A and 8B respectively show structural schematic diagrams of different embodiments of the microstructure assembly 53.
As shown in fig. 8A, carrier 535 comprises a microstructure area 531 provided with microstructures and an area 534 without microstructures. For example, the imaging light beam incident perpendicular to the carrier 535 of the microstructure component 53 includes parallel light L1 and light L2, where the light L1 is deflected in the microstructure region 531 and then penetrates through the carrier 535 to be emitted, and the light L2 penetrates through the non-microstructure region 534 of the carrier, is not deflected, but directly penetrates through the carrier 535 to be emitted along the original propagation direction, thereby achieving the light splitting effect of L1 and L2.
Alternatively, it is also possible to provide one or more microstructure areas specifically only on a partial region of the carrier 535. As shown in fig. 8B, the carrier 535 has two microstructure regions, namely a first microstructure region 532 and a second microstructure region 533. Said first and second microstructure areas 532, 533 are separated from each other on the carrier 535, for example by an area 531 free of microstructures in the middle. When the illumination light beam with image information passes through the microstructure component 53, the incident light beam is deflected by the first microstructure area 532 and the second microstructure area 533, respectively, to generate L1 light and L2 light with different deflection angles as shown in fig. 8B.
In addition, microstructures can also be formed over the entire surface of carrier 535. For example, on the side where the imaging beam is incident on carrier 535, the microstructures are continuously distributed over the entire side of carrier 535. Alternatively, the overall microstructure area may be configured differently across different areas of the entire side of carrier 535. Since the microstructure areas in different structural forms can refract incident imaging beams to different degrees, the desired light splitting effect can be realized according to needs, and meanwhile, the manufacturing and the assembly of the microstructure assembly are facilitated.
As a variant, it is also conceivable to arrange the microstructure on the side from which the imaging beam emerges from the carrier 535. Or further on two opposite sides of the carrier 535, i.e. the entry side and the exit side of the imaging beam, microstructures are arranged. In this case, the refraction effect of the light beam in the microstructure areas on the two sides can be imaged, and more complex and various flexible light splitting effects can be realized.
The microstructure area may be constituted by a plurality of identical polygonal prisms or by a combination of a plurality of different polygonal prisms. Alternatively, the microstructure area may be formed by a plurality of identical lenses or a combination of a plurality of different lenses. Note that the prism on the microstructure 536 functions to deflect the imaging beam with image information. Therefore, the number of prisms, the combination arrangement, and the like of the microstructure region are not limited, and other arrangements that can deflect the light beam can be used as well. For example, the microstructure 536 may include two triangular prisms, or two pentagonal prisms. Here, the microstructures 536 disposed on the first microstructure region 532 and the second microstructure region 533 may include the same or different prism combinations. By these technical measures it is ensured that the image information carrying imaging beam is deflected through the microstructure 536 at the desired different angles.
It should be noted that when the microstructure areas are provided in plural, the emergent beams after being refracted by different microstructure areas have a certain included angle, so that the imaging beams emerging from the microstructure assembly 53 are deflected at different angles when entering the imaging screen 6, and the imaging beams do not interfere, overlap and cross talk with each other. It should also be noted that the microstructures 536 can be any shape having an optical surface, such as triangular, spherical, planar, and other polygonal shapes, etc. In this regard, the microstructures on carrier 535 form a collection of tiny optical components, and the imaging beam can be incident through the regular optical surfaces of the microstructures and can be refracted out at a desired angle in a regular pattern to achieve the desired spectroscopic imaging effect.
Fig. 8C is a schematic of the optical path of some embodiments of the microstructure assembly. A schematic of the path of light through a single microstructure 536 is shown. Incident angle of light is I 2 It is deflected twice through microstructure 536, at an angle of I' 2 And the angle after the second deflection is I' 3 . And I 2 And I' 3 Satisfies the following conditions: I.C. A 2 ＜I′ 3 ＜2I 2 . The angle is so set up for imaging beam reflection or deflection angle are less, can enough reduce energy loss, can promote the luminance of reflection or deflection department image again, guarantee the formation of image effect of image.
The included angle of the upper end of the microstructure 536 is gamma, and the angle range can be set to be 50-70 deg. The refractive index of the microstructure 536 is set to n, which is set to 1.5. Ltoreq. N.ltoreq.1.9. In order to make the image generated by the image generation module 3 have good effect, the projection angle of the whole projection system is set to be 10-50 degrees, and then the incident angle I is 2 The condition that I is more than or equal to 0 degree 2 35 DEG or less, angle I 'of light emitted by microstructure 536' 3 The condition to be satisfied is I' 3 Not less than 5 degrees. When the microstructure 536 shown in the figure is selected, each angle in the optical path schematic diagram of the microstructure 536 satisfies the condition: sinI 2 ＝nsinI′ 2 ，nsin I 3 ＝sin I′ 3 ，γ＝I′ 2 -I 3 。
In other embodiments of the projection system of the present application shown in fig. 9, the microstructure assembly 53 may be constructed as a unitary structure with the imaging screen 6, such as the spectroscopy module 5 shown in fig. 9. The microstructure areas can be arranged on or machined into the carrier 535 of the microstructure assembly 53 or on only one side of the imaging screen 6 as carrier 535.
Alternatively, microstructures 536 can be machined directly into the material surface of carrier 535. The imaging screen 6 can directly serve as a carrier 535 for the microstructure assembly 53. In this case, the imaging screen 6 itself can be designed as an imaging screen 6 with a microstructured surface.
Alternatively, the microstructures 536 themselves may be constructed as separate components that are directly affixed to the carrier 535. In the case of a carrier 535 configured as an imaging screen 6, such a microstructure 536 can be fixed directly on the imaging screen 6. For example, the carrier 535 of the microstructure assembly 53 may be fixed to the imaging screen 6 with its side without microstructures 536. The microstructure assembly 53 may be fastened to the carrier 535 or the imaging screen 6 as the carrier 535 by means of snap-in, screw-in, adhesive, etc. By the measures, the manufacturing and the assembling of the light splitting module can be simplified, and meanwhile, the stability of the whole projection system can be improved.
Alternatively, the microstructure component 53 may also be arranged in the optical path between the imaging screen 6 and the image generation module 3, separate from the imaging screen 6. In the case where the microstructures 536 and the imaging screen 6 are separated from each other, the arrangement of the microstructures 536 on the carrier 535 is more flexible, and can be arranged on the light-in side of the carrier 535 or on the light-out side of the carrier 535. It is also conceivable that the first microstructure areas 532 are arranged on the light entry side of the carrier 535 and the second microstructure areas 533 are arranged on the light exit side of the carrier 535. That is, under the condition that different angle deflection is generated on the imaging light beam with image information, different microstructure areas can be reasonably arranged according to the requirements of actual production and specific application.
According to other embodiments of the present application, the light splitting module 5 may be one of the grating 511, the wedge 52, the prism or the microstructure 536 as described above, or may be a combination of the grating 511, the wedge 52, the prism or the microstructure 536 as described above. According to the requirements of actual production and specific application, the light splitting module 5 can be reasonably arranged, so that the light splitting module 5 can adapt to a projection system in different application scenes, and a light splitting function is provided for light beams of the projection system. By means of the technical measures, after the imaging light beam with the image information is subjected to light splitting through the light splitting module 5, the imaging light beam can be deflected at a certain angle, and two or more pictures can be generated at the imaging screen 6. Further, the two or more screens may cooperate with an external control system to achieve complex projection effects such as HMI and AR.
According to other embodiments of the present application, the spectroscopy module 5 can be constructed as a single structural unit according to the actual production and the needs of the specific application. This structural unit can be manufactured and assembled as one integral part and used in conjunction with existing projection systems. The light splitting module is arranged on a projection light path formed between the projection lens 4 and the imaging screen 6 of the projection system, so that the light splitting module can split light of the existing projection system, and the limitation that the existing projection system can only image singly is changed. It is noted that when the beam splitting module 5 of the projection system is referred to herein as a separate structural unit, it can be adapted to a variety of prior art projection systems, such as post-installation. Therefore, the projector further has the excellent effect that the whole projection system does not need to be changed, the external light splitting module is adopted to change the light path, and the adjustment is easy.
Further, the light splitting module 5 may further include its own light splitting control unit. The light splitting control unit can control the light splitting module 5 through circuit connection and/or mechanical fixed connection. Furthermore, it is conceivable to move the beam splitter module 5 in the beam path of the imaging beam with the image information by means of mechanical movement. This movement may be along the optical path of the imaging beam or perpendicular to the optical path of the imaging beam. Therefore, the light splitting module can be additionally arranged at the later stage and is matched with the existing projection system for use, the setting of the original projection lens 4 is not required to be changed, and only the light splitting module and/or the light splitting control unit are/is required to be adjusted, so that the adaptability of the original projection system is enhanced. In the needs of actual production and specific application, the cost is saved, and the working efficiency of the projection system and the imaging effect of the projection system are improved.
It should be noted that, by using the light splitting module 5, the projection system of the present application can achieve the effect of projecting a plurality of pictures in the same or different imaging planes by splitting light. To this end, the projection system may further include an external control system of the projection system, which may be a wired or wireless circuit connected circuit assembly, as required by the actual production and specific application. The circuit component is matched with the projection system for use by setting corresponding functions such as setting a computer algorithm and the like, and meanwhile, complex projection effects such as HMI (human machine interface), AR (augmented reality) and the like are realized, so that the projection system has better imaging effect and user experience in actual use.
According to another aspect of the present application, the present application further proposes a vehicle comprising a projection system as described above.
The projection system can project the imaging light beam with image information to the imaging screen, where the imaging screen can be, for example, a windshield of an automobile or other special screen, so that a driver can see a plurality of image information on the imaging screen 6 during the traveling of the automobile, or the multi-path imaging light beam obtained by light splitting can be continuously processed by setting corresponding functions such as setting computer algorithms and the like through, for example, an external control system, and meanwhile, complex and various projection effects such as HMI and AR and the like can be realized, thereby the projection system can provide enhanced optical functions and user interaction effects in actual use.
According to another aspect of the present application, the present application also proposes a projection method implemented using the projection system as described above and including the following steps:
controlling the light source module 1 to generate and emit an illumination light beam;
guiding the illumination light beam emitted by the light source module 1 to pass through the image generation module 3 and generating an imaging light beam with image information;
the imaging light beam with image information is guided through a beam splitting module 5, whereby the imaging light beam with image information is split into multiple imaging light beams by the beam splitting module 5.
According to a projection method proposed by another aspect of the present application, the projection method further includes imaging the plurality of imaging light beams split by the splitting module 5 on an imaging screen 6.
In which a grating assembly 51 is used as the spectroscopic module 5. The grating 511 of the grating assembly 51 receives the imaging light beam with image information from the image generation module 3 and can change the propagation direction of the imaging light beam with image information in the grating 511. The grating 511 is set to have an on state and an off state, and the grating 511 is switched to the off state, so that the imaging beam with the image information is refracted in the grating 511. The grating 511 is switched to the on state so that the imaging beam with the image information propagates in a straight line in the grating.
Or an optical wedge 52 or a prism is used as the light splitting module 5. The optical wedge 52 or the prism is arranged on the light-emitting side of the image generation module 3, so that the multiple imaging light beams divided by the optical wedge 52 or the prism are imaged on the imaging screen 6.
Or the microstructure assembly 53 may be used as the light splitting module 5. The microstructure component 53 is arranged on the light-emitting side of the image generation module 3, so that the multiple imaging light beams divided by the microstructure component 53 are imaged on the imaging screen 6.
It should be noted that the projection method may further include the following steps:
imaging of the multi-path imaging light beams formed after light splitting on the imaging screen 6 is controlled by the external control system, and complex projection effects such as HMI and AR are achieved.
By using the projection method, the projection system can realize the effect of projecting a plurality of pictures in the same or different imaging planes through light splitting, thereby realizing complex projection effects such as HMI (human machine interface), AR (augmented reality) and the like, and leading the projection system to have better imaging effect and user experience in actual use.
The above description is meant as an illustration of preferred embodiments of the application and of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be interchanged with other features disclosed in this application, but not limited to those having similar functions.

Claims (10)

1. A projection system, characterized in that the projection system comprises:
a light source module for generating and emitting an illumination beam;
the image generation module is arranged on the light emitting side of the light source module, receives the illumination light beams emitted by the light source module and generates imaging light beams with image information; and
and the light splitting module is arranged on the light emitting side of the image generating module and is used for splitting the imaging light beams with the image information into multiple imaging light beams.
2. The projection system of claim 1, wherein the incident angle of the imaging beam with image information generated by the image generation module passing through the light splitting module is α, the exit angle of the imaging beam with image information generated by the image generation module passing through the light splitting module is α ', and α' satisfy: alpha < alpha' < 2 alpha.
3. The projection system of claim 2, wherein the light splitting module is configured as a grating assembly comprising a grating that receives the image-information bearing imaging light beam from the image generation module and is capable of changing a direction of propagation of the image-information bearing imaging light beam in the grating.
4. A projection system according to claim 3, wherein the grating has electro-optical properties enabling the direction of propagation of the image beam with image information to be changed in different operating states.
5. The projection system of claim 4, wherein the grating assembly further comprises a mirror disposed on one side of the grating and configured to reflect the image beam with image information back through the grating after first passing through the grating and again through the grating.
6. The projection system of claim 5, wherein the mirror is disposed parallel to the grating and causes the imaging beam with image information from the image generation module to first pass through the grating.
7. The projection system of claim 4, wherein the grating is configured as a holographic polymer dispersed liquid crystal element comprising a polymer and liquid crystal molecules distributed in the polymer.
8. The projection system of claim 4, wherein the grating assembly further comprises a grating control system that controls the grating to switch between an on state and an off state using a voltage applied to the grating.
9. The projection system of claim 2, wherein the light splitting module is configured as a structural block disposed on a light exit side of the image generation module.
10. The projection system of claim 9, further comprising an imaging screen disposed on the light exit side of the light splitting module for imaging the multiple imaging beams formed by the light splitting module after splitting on the imaging screen, wherein the structural block is integrated with the imaging screen.
CN202111088878.1A 2021-09-16 2021-09-16 Projection system, vehicle and projection method Pending CN115808796A (en)

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