Projection system and projection method

Abstract

The present invention provides a projection system and a projection method, wherein the projection system comprises: a light source module; an image source module, which is arranged at the light output side of the light source module, the image source module provides pattern information to be displayed, and the light beam emitted through the image source module carries the pattern information to be displayed; a projection module, which receives the light beam carrying the pattern information to be displayed; and a reflective element, which comprises a first reflective element and a second reflective element; the first reflective element comprises a plurality of reflectors arranged at the light input side of the image source module, each reflector being arranged at a non-pattern area of ​​the image source module; the second reflective element is arranged at a side where light is reflected from the first reflective element, and the second reflective element is used to reflect the light beam reflected from the first reflective element to the image source module. The projection system of the present invention reutilizes the light beam incident to the non-pattern area of ​​the image source module by arranging the reflective element, thereby improving the light utilization rate of the projection system.

Description

Technical Field

[0001] The present invention relates to the technical field of optical projection, and in particular to a projection system and a projection method. Background Art

[0002] As vehicle lighting functions become more and more diverse, more and more automobile-related manufacturers are developing new projection technologies. Among them, the film-based static projection technology has a variety of solutions that are favored by OEMs. The existing technical solutions are all combinations of collimation systems and projection systems. The illumination light path only passes through the pattern module once, and the energy utilization rate is low. At the same time, the light spot generated by the conventional collimation system is a circular light spot, which is much larger than the pattern area of ​​the film, resulting in serious energy waste and low light efficiency; in addition, the light spot generated by the conventional collimation system presents a Gaussian distribution, that is, the central brightness is large, the edge illumination is low, and the uniformity on the vertical phase plane is poor.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In view of the problems in the prior art, an object of the present invention is to provide a projection system, which, by providing a reflective element, reutilizes the light beam incident to the non-pattern area of ​​the image source module, thereby improving the light utilization rate of the projection system.

[0005] A first aspect of the present invention provides a projection system, comprising:

[0006] A light source module, used for generating a light beam;

[0007] An image source module is arranged at the light-emitting side of the light source module, the image source module provides pattern information to be displayed, and the light beam emitted by the image source module carries the pattern information to be displayed;

[0008] a projection module, disposed on the light-emitting side of the image source module, for receiving the light beam carrying the pattern information to be displayed, and projecting the pattern information to be displayed onto a display surface; and

[0009] A reflective element, comprising a first reflective element and a second reflective element;

[0010] The first reflective element includes a plurality of reflectors disposed on the light incident side of the image source module, each of the reflectors being disposed in a non-pattern area of ​​the image source module;

[0011] The second reflecting element is disposed on a side of the first reflecting element where light is reflected, and the second reflecting element is used to reflect the light beam reflected by the first reflecting element to the image source module.

[0012] According to the first aspect of the present invention, it further comprises a collimating lens assembly disposed on the light emitting side of the light source module, and the collimating lens assembly collimates and outputs the light beam generated by the light source module.

[0013] According to the first aspect of the present invention, the light source module and the collimating lens assembly are arranged obliquely or vertically on the light incident side of the image source module.

[0014] According to the first aspect of the present invention, the light source module is a laser light source module or an LED light source module;

[0015] The laser light source module generates a laser beam;

[0016] The LED light source module generates an LED light beam.

[0017] According to the first aspect of the present invention, the incident angle of the light beam incident to the image source module on the plane where the image source module is located is θ1, and the incident angle θ1 satisfies:

[0018] Wherein, F# is the F number of the lens in the projection module.

[0019] According to the first aspect of the present invention, the angle between the light beam reflected by the first reflective element and the normal line of the image source module is θ2, and the angle θ2 satisfies:

[0020] Wherein, F# is the F number of the lens in the projection module.

[0021] According to a first aspect of the present invention, the reflector of the first reflective element is one of a plane reflector, an inclined reflector, a microstructure reflective array or a curved reflector.

[0022] According to the first aspect of the present invention, the reflector of the first reflective element is a plane reflector or an inclined reflector, and the angle between the reflective surface of the reflector and the plane where the image source module is located is θ3, and the angle θ3 satisfies: θ3≤5°.

[0023] According to the first aspect of the present invention, the second reflective element is one of a plane reflector, an inclined reflector, a microstructure reflective array or a curved reflector.

[0024] According to the first aspect of the present invention, the incident angle of the light beam reflected by the second reflective element to the image source module on the plane where the image source module is located is θ4, and the incident angle θ4 satisfies:

[0025] Wherein, F# is the F number of the lens in the projection module.

[0026] According to a first aspect of the present invention, the reflector of the first reflective element or the second reflective element is a microstructure reflective array;

[0027] The inclination angle of the microstructure of the microstructure reflection array is θ5, and the inclination angle θ5 satisfies: θ5≤5°.

[0028] A second aspect of the present invention provides a projection method, using the projection system described in the first aspect, the projection method comprising the following steps:

[0029] The light source module generates a light beam incident on the image source module;

[0030] The light beam incident on the multiple reflectors of the first reflective element is reflected by the multiple reflectors and then incident on the second reflective element;

[0031] The light beam incident on the second reflecting element is reflected by the second reflecting element toward the image source module;

[0032] The light beam emitted from the image source module carries the pattern information to be displayed and projects the pattern information to be displayed onto the display surface through the projection module.

[0033] The projection system of the present invention introduces a first reflective element in the non-pattern area of ​​the image source module, and adds a second reflective element at the rear end. The first reflective element and the second reflective element constitute a reflective system, and the light beam incident to the non-pattern area of ​​the image source module is reused for a second time, thereby improving the light utilization rate of the projection system. The projection system of the present invention has the following advantages:

[0034] 1. No need to add light source modules to improve the lighting effect;

[0035] 2. The reflection angle of the second reflection element can be adjusted according to specific requirements, and the energy distribution of the same light area on the image source module can be improved, thereby improving the uniformity of the image plane in the oblique projection;

[0036] 3. The first reflective element is disposed on the light incident side of the image source module, which will not significantly increase the projection volume of the system and will not increase the total length of the projection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0038] Figure 1 is a schematic structural diagram of a projection system of the present invention;

[0039] Figure 2 is a schematic structural diagram of a projection system according to a first embodiment of the present invention;

[0040] Figure 3 is a schematic structural diagram of a projection system according to a second embodiment of the present invention;

[0041] Figure 4 is a schematic structural diagram of a projection system according to a third embodiment of the present invention;

[0042] Figure 5 is a schematic structural diagram of a projection system according to a fourth embodiment of the present invention;

[0043] Figure 6 is a schematic structural diagram of a microstructure reflective array of the present invention;

[0044] Figure 7 4 is a flow chart of a projection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0046] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0047] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0049] In order to solve the technical problems in the prior art, the embodiment of the present invention provides a projection system such as Figure 1 As shown, the projection system includes: a light source module 10, for generating a light beam; an image source module 20, arranged on the light-emitting side of the light source module 10, the image source module 20 provides pattern information to be displayed, and the light beam emitted by the image source module 20 carries the pattern information to be displayed; a projection module 30, arranged on the light-emitting side of the image source module 20, for receiving the light beam carrying the pattern information to be displayed, and projecting the pattern information to be displayed onto a surface to be displayed; and a reflective element, including a first reflective element and a second reflective element 420; the first reflective element includes a plurality of reflectors 410 arranged on the light-incident side of the image source module, each of the reflectors 410 being arranged in a non-pattern area of ​​the image source module 20; the second reflective element 420 is arranged on the side where light is reflected from the first reflective element, and the second reflective element 420 is used to reflect the light beam reflected by the first reflective element to the image source module 20.

[0050] The projection system of the present invention introduces a first reflective element in the non-pattern area of ​​the image source module, and adds a second reflective element at the rear end. The first reflective element and the second reflective element constitute a reflective system, and the light beam incident to the non-pattern area of ​​the image source module is reused for the second time, thereby improving the light utilization rate of the projection system. The projection system of the present invention has the following advantages: the light efficiency can be improved without adding a light source module; the reflection angle of the second reflective element and the energy distribution of the same light area on the image source module can be adjusted according to specific requirements, thereby improving the uniformity of the image plane in the oblique projection; the first reflective element is arranged on the light incident side of the image source module, which will not significantly increase the projection volume of the system and will not increase the total length of the projection system.

[0051] The structure of the projection system of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the protection scope of the present invention.

[0052] Figure 2 is a schematic diagram of the structure of a projection system according to a first embodiment of the present invention. In the first embodiment, the projection system comprises:

[0053] The light source module 10 for generating a light beam, it should be noted that the light source module 10 of the present invention can be a laser light source module, the laser light source module generates a laser light beam. The light source module 10 can also be an LED light source module, the LED light source module generates an LED light beam. The LED light source module can generate monochromatic light, such as red light, blue light or green light.

[0054] The image source module 20 is arranged on the light-emitting side of the light source module 10, that is, the light beam emitted from the light source module 10 is incident from one side of the image source module 20 and emitted from the other side of the image source module 20. The image source module 20 includes a pattern area carrying pattern information to be displayed and a non-pattern area not carrying pattern information. Since the image source module 20 provides pattern information to be displayed, the light beam emitted through the image source module 20 carries the pattern information to be displayed.

[0055] The reflective element in the first embodiment includes a first reflective element and a second reflective element 420a, wherein the first reflective element includes a plurality of plane reflectors 410a disposed on the light incident side of the image source module 20, and each plane reflector 410a is disposed on the non-pattern area of ​​the image source module 20. The plane reflector 410a can be disposed on the image source module 20 in a close fit, or can be disposed on the light incident side of the image source module 20 separately, that is, there is a certain distance between the plane reflector 410a and the image source module 20, and the distance between the plane reflector 410a and the image source module 20 is less than or equal to 2 mm, and preferably, the distance between the two is less than or equal to 1 mm.

[0056] According to the first aspect of the present invention, the incident angle of the light beam generated by the light source module 10 and incident on the image source module on the plane where the image source module 20 is located is θ1, that is, the incident surface is the plane where the image source module 20 is located, and the incident angle θ1 satisfies:

[0057] Wherein, F# is the F number of the lens in the projection module.

[0058] Here, That is, it is the light cone angle of the projection module 30 arranged on the light-emitting side of the image source module 20. When the incident angle θ1 of the light beam incident to the image source module 20 on the plane where the image source module 20 is located is less than or equal to the light cone angle of the projection module 30, as many incident light beams as possible can enter the image source module 20 to carry the pattern information to be displayed, and project the pattern information to be displayed on the display surface through the projection system 30, thereby improving the light efficiency of the entire projection system.

[0059] In order to improve the collimation of the incident light beam, the projection system of the first embodiment may further include a collimating lens assembly 110 disposed on the light output side of the light source module, and the collimating lens assembly 110 collimates and outputs the light beam generated by the light source module. The projection system of the present invention may also include other beam adjustment assemblies to further adjust the light beam emitted to the image source module to improve the quality of the incident light beam. The light source module 10 and the collimating lens assembly 110 may be tiltedly disposed on the light input side of the image source module 20, or may be vertically disposed on the light input side of the image source module 20.

[0060] In the first embodiment, the first reflective element includes a plurality of plane reflectors 410a, and the plurality of plane reflectors 410a are attached to the light incident side of the image source module 20, that is, the plane where the image source module 20 is located is parallel to the reflection surface of the plurality of plane reflectors 410a, and the normal line of the image source module 20 coincides with the normal line of the plurality of plane reflectors 410a, at which time, the incident angle θ1 on the plane of the image source module 20 is equal to the incident angle on the reflection surface of the plane reflector 410a. When the plurality of plane reflectors 410a reflect light beams, the angle θ2 between the reflected light beams and the normal line of the image source module is the reflection angle of the plane reflector 410a, and the reflection angle (angle θ2) is equal to the incident angle θ1.

[0061] In the first embodiment, the second reflecting element 420a is arranged on the side where the light is reflected from the first reflecting element, and the second reflecting element 420a is used to reflect the light beam reflected from the first reflecting element to the image source module 20. The second reflecting element can be one of a plane reflector, a bevel reflector, a microstructure reflective array or a curved reflector, such as the second reflecting element 420a can be a concave reflector, etc. The present invention does not limit the specific position of the second reflecting element 420a. When the light is reflected from the first reflecting element to the second reflecting element 420a, and then reflected from the second reflecting element 420a to the image source module 20, the incident angle of the light beam reflected by the second reflecting element 420a on the plane where the image source module is located is θ4, and the incident angle θ4 satisfies:

[0062] Wherein, F# is the F number of the lens in the projection module.

[0063] That is, preferably, the incident angle θ4 of the light beam reflected by the second reflecting element 420a on the plane where the image source module 20 is located should also be less than or equal to the light cone angle of the projection module 30. At this time, as many light beams as possible reflected from both sides of the first reflecting element and the second reflecting element to the image source module 20 can enter the image source module 20 to carry the pattern information to be displayed, and the pattern information to be displayed can be projected onto the display surface through the projection system 30, thereby improving the light efficiency of the entire projection system.

[0064] Figure 3: is a schematic diagram of the structure of the projection system of the second embodiment of the present invention. In the second embodiment, the light source module 10 and the image source module 20 included in the projection system can adopt the structure of the first embodiment. The reflective element in the second embodiment includes a first reflective element and a second reflective element 420b. Unlike the first embodiment, the first reflective element includes a plurality of reflectors 410b arranged in the non-pattern area of ​​the image source module 20, and the angle between the reflective surface of the first reflective element and the plane where the image source module 20 is located is θ3. At this time, the reflector 410b can be a plane reflector or a microstructure reflective array whose reflective surface and the plane where the image source module 20 are located have an angle of θ3, or can be an inclined reflector with an angle of θ3.

[0065] Still taking the incident angle θ1 of the light beam generated by the light source module 10 and incident on the image source module on the plane where the image source module 20 is located as an example, in order to improve the light efficiency of the entire projection system, preferably, the incident angle θ1 satisfies:

[0066] Wherein, F# is the F number of the lens in the projection module.

[0067] In the second embodiment, since the normal line of the image source module 20 does not coincide with the normal lines of the multiple reflectors 410b, the angle θ2 between the light beams reflected by the multiple plane reflectors 410b of the first reflective element and the normal line of the image source module is different from the reflection angle of the plane reflector 410b itself. Preferably, the angle θ2 satisfies:

[0068] Wherein, F# is the F number of the lens in the projection module.

[0069] In the second embodiment, similarly, the second reflective element 420b may be one of a plane reflector, a bevel reflector, a microstructure reflective array or a curved reflector, such as the second reflective element 420b may be a concave reflector, etc. The present invention does not limit the specific position of the second reflective element 420b. Preferably, when the light beam is reflected from the first reflective element to the second reflective element 420b, and then reflected from the second reflective element 420b to the image source module 20, the incident angle of the light beam reflected by the second reflective element 420b on the plane where the image source module is located is θ4, and the incident angle θ4 satisfies:

[0070] Wherein, F# is the F number of the lens in the projection module.

[0071] That is, preferably, the incident angle θ4 of the light beam reflected by the second reflective element 420a on the plane where the image source module 20 is located should also be less than or equal to the light cone angle of the projection module 30, thereby improving the light efficiency of the entire projection system.

[0072] In order to ensure that the incident angle θ4 of the light beam after being reflected twice by the first reflecting element and the second reflecting element on the plane where the image source module 20 is located is less than or equal to the light cone angle of the projection module 30, preferably, the angle θ3 between the reflecting surface of the reflector and the plane where the image source module is located satisfies: θ3≤5°, and the specific value of the angle θ3 is not limited here.

[0073] It should be noted that the incident angle θ1 of the light beam generated by the light source module 10 in the present invention that is incident on the image source module on the plane where the image source module 20 is located can be zero, or can be between zero and the light cone angle, that is, the light beam can be incident on the image source module 20 vertically, or can be incident on the image source module 20 at a certain angle. Figure 4 : is a schematic diagram of the structure of the projection system of the third embodiment of the present invention. At this time, the light source module 10 and the collimating lens assembly 110 are vertically arranged on the light incident side of the image source module 20. At this time, if the structure of the first reflective element of the first embodiment is adopted, the incident angle θ1 is zero, and the light beam reflected by the multiple plane reflectors 410a of the first reflective element is reflected to the direction of the light source module 10. Therefore, the effect of being incident to the image source module 20 again after being reflected twice by the first reflective element and the second reflective element cannot be achieved. At this time, the structure of the first reflective element in the second embodiment should be adopted, that is, the incident angle of the light beam generated by the light source module 10 in the present invention incident to the first reflective element cannot be zero. The reflector 410c can be a plane reflector or a microstructure reflective array with an angle θ3 between its reflective surface and the plane where the image source module 20 is located, or it can be an inclined reflector with an oblique angle θ3. In the second embodiment, the second reflective element 420c can be one of a plane reflector, an inclined reflector, a microstructure reflective array or a curved reflector, which is not limited here.

[0074] Figure 5 : is a schematic diagram of the structure of a projection system according to a fourth embodiment of the present invention. In the fourth embodiment, the light source module 10 and the image source module 20 included in the projection system can adopt the structure of the first embodiment. The reflective element in the fourth embodiment includes a first reflective element and a second reflective element 420d. Different from the first and second embodiments, the first reflective element includes a plurality of reflectors 410d disposed in a non-pattern area of ​​the image source module 20 as a microstructure reflective array.

[0075] Figure 6: is a structural schematic diagram of the microstructure reflection array of the present invention, wherein the microstructure reflection array can be regarded as a reflector with a microstructure reflection surface, and the microstructure reflection surface can reflect the incident light beam at a changed angle, that is, at this time, there is a certain angle between the light beams reflected by the multiple microstructure reflection arrays of the first reflection element. In order to ensure that the incident angle θ4 of the light beam after being reflected twice by the first reflection element and the second reflection element on the plane where the image source module 20 is located is less than or equal to the light cone angle of the projection module 30, the microstructure of the microstructure reflection array can be composed of multiple miniature inclined reflection surfaces, and the inclination angle of the microstructure of the microstructure reflection array is θ5, and the inclination angle θ5 satisfies: θ5≤5°. The specific value of the angle θ5 is not limited here.

[0076] It should be noted that when the first reflective element of the fourth embodiment includes a plurality of reflectors 410d using a microstructure reflective array, the microstructure reflective array itself can be parallel to the plane where the image source module 20 is located as in the first embodiment, or can be at a certain angle θ3 with the plane where the image source module 20 is located as in the second embodiment, and the preferred value of the angle θ3 is also as described in the second embodiment. The first reflective element can be a plane reflector, a bevel reflector or a microstructure reflective array in the above embodiments, or it can be a curved reflector.

[0077] The second reflective element 420a / 420b / 420c / 420d in the first embodiment, the second embodiment, the third embodiment and the fourth embodiment can also be a microstructure reflective array. Similarly, the microstructure of the microstructure reflective array can be composed of multiple miniature inclined reflective surfaces. The inclination angle of the microstructure of the microstructure reflective array is θ5, and the inclination angle θ5 satisfies: θ5≤5°. The specific value of the angle θ5 is not limited here. In the present invention, through the reasonable design of the first reflective element and the second reflective element, such as selecting the set position, the selection of the reflector type itself, and the size of the angle θ3 between the reflective surface and the plane where the image source module is located, as many reflected light beams as possible after being reflected twice by the first reflective element and the second reflective element enter the image source module 20, that is, the incident angle θ4 of the light beam reflected by the second reflective element on the plane where the image source module is located is less than or equal to the light cone of the projection module 30, and as many light beams as possible enter the image source module 20 and carry the pattern information to be displayed and project the pattern information to be displayed on the display surface through the projection system 30, thereby improving the light efficiency of the entire projection system.

[0078] A second aspect of the present invention provides a projection method, which adopts the projection system described in the first aspect. Figure 7 : is a flow chart of a projection method according to an embodiment of the present invention. Specifically, the projection method comprises the following steps:

[0079] S100: The light source module generates a light beam incident on the image source module;

[0080] S200: The light beam incident on the multiple reflective mirrors of the first reflective element is reflected by the multiple reflective mirrors and then incident on the second reflective element;

[0081] S300: The light beam incident on the second reflective element is reflected by the second reflective element toward the image source module;

[0082] S400: The light beam emitted by the image source module carries pattern information to be displayed and projects the pattern information to be displayed onto a display surface through the projection module.

[0083] In the projection method of the present invention, the light beam incident to the non-pattern area of ​​the image source module is reflected back to the image source module twice through the first reflecting element and the subsequent second reflecting element, thereby effectively reusing the light beam incident to the non-pattern area of ​​the image source module, thereby improving the light utilization rate of the entire projection system.

[0084] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A projection system, characterized in that: include: A light source module, used for generating a light beam; An image source module is arranged at the light-emitting side of the light source module, the image source module provides pattern information to be displayed, and the light beam emitted by the image source module carries the pattern information to be displayed; a projection module, disposed on the light-emitting side of the image source module, for receiving the light beam carrying the pattern information to be displayed, and projecting the pattern information to be displayed onto a display surface; and A reflective element, comprising a first reflective element and a second reflective element; The first reflective element includes a plurality of reflectors disposed on the light incident side of the image source module, each of the reflectors being disposed in a non-pattern area of ​​the image source module; The second reflecting element is disposed on a side of the first reflecting element where light is reflected, and the second reflecting element is used to reflect the light beam reflected by the first reflecting element to the image source module.

2. The projection system according to claim 1, characterized in that: It also includes a collimating lens assembly arranged on the light-emitting side of the light source module, and the collimating lens assembly collimates and outputs the light beam generated by the light source module.

3. The projection system according to claim 1, characterized in that: The incident angle of the light beam incident to the image source module on the plane where the image source module is located is θ1, and the incident angle θ1 satisfies: Wherein, F# is the F number of the lens in the projection module.

4. The projection system according to claim 1, characterized in that: The angle between the light beam reflected by the first reflective element and the normal line of the image source module is θ2, and the angle θ2 satisfies: Wherein, F# is the F number of the lens in the projection module.

5. The projection system according to claim 1, characterized in that: The reflector of the first reflective element is one of a plane reflector, an inclined reflector, a microstructure reflective array or a curved reflector.

6. The projection system according to claim 1, characterized in that: The reflector of the first reflective element is a plane reflector or an inclined reflector, and the angle between the reflective surface of the reflector and the plane where the image source module is located is θ3, and the angle θ3 satisfies: the angle θ3 is less than or equal to 5 degrees.

7. The projection system according to claim 1, characterized in that: The second reflective element is one of a plane reflector, an inclined reflector, a microstructure reflective array or a curved reflector.

8. The projection system according to claim 1, characterized in that: The incident angle of the light beam reflected by the second reflective element to the image source module on the plane where the image source module is located is θ4, and the incident angle θ4 satisfies: Wherein, F# is the F number of the lens in the projection module.

9. The projection system according to claim 1, characterized in that: The reflector of the first reflective element or the second reflective element is a microstructure reflective array; The inclination angle of the microstructure of the microstructure reflection array is θ5, and the inclination angle θ5 satisfies: the inclination angle θ5 is less than or equal to 5 degrees.

10. The projection system according to claim 2, characterized in that: The light source module and the collimating lens assembly are arranged obliquely or vertically on the light incident side of the image source module.

11. The projection system according to claim 1, characterized in that: The light source module is a laser light source module or an LED light source module; The laser light source module generates a laser beam; The LED light source module generates an LED light beam.

12. A projection method, using the projection system according to claim 1, characterized in that: The projection method comprises the following steps: The light source module generates a light beam incident on the image source module; The light beam incident on the multiple reflectors of the first reflective element is reflected by the multiple reflectors and then incident on the second reflective element; The light beam incident on the second reflecting element is reflected by the second reflecting element toward the image source module; The light beam emitted from the image source module carries the pattern information to be displayed and projects the pattern information to be displayed onto the display surface through the projection module.

Images