CN216870999U - Projection display system - Google Patents
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- CN216870999U CN216870999U CN202220487866.XU CN202220487866U CN216870999U CN 216870999 U CN216870999 U CN 216870999U CN 202220487866 U CN202220487866 U CN 202220487866U CN 216870999 U CN216870999 U CN 216870999U
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Abstract
The application discloses a projection display system, which comprises a light source module for emitting light beams, a convergence module for converging the light beams, a scanning imaging module and a compensation module; the scanning imaging module is configured to: scanning the light beam to form a first light spot in a preset projection area, wherein the first light spot is used for forming an image; the compensation module is configured to: and compensating the projection light path of the first light spot based on the optical path difference from the scanning imaging module to different positions in the preset projection area, and enabling the optical paths from the scanning imaging module to the different positions in the preset projection area to be the same. The utility model provides a utilize the module of assembling to assemble the light beam and can form small-size facula in predetermineeing the projection area to improve projection display system's resolution ratio, simultaneously, utilize compensation module to make scanning imaging module the optical path to predetermineeing different positions in the projection area the same, reduce the size deviation of predetermineeing the facula in the projection area, ensure that above-mentioned facula size has good uniformity.
Description
Technical Field
The application relates to the technical field of projection correlation, in particular to a projection display system.
Background
With the development of projection technology, projection display systems are widely used in various fields, in which a light source passes through a series of lenses and irradiates a Micro Electro Mechanical System (MEMS), and the MEMS reflects and projects a received light beam in a scanning manner into a projection plane to form an image.
At present, a higher requirement is put forward on the resolution of the projection display system, and the key factor influencing the resolution of the projection display system is the size of the light spot in the projection plane. Because the projection display system is realized by using the visual residual of human eyes, in order to avoid the phenomenon of projection ghost image caused by overlapping of light spots, the size of the light spots needs to be smaller than a certain range, and the smaller the size of the light spots is, the higher the resolution of the projection display system is.
However, the existing projection display system usually adopts afocal collimated light beam for illumination, and the corresponding spot size is large, often between 800 μm and 1000 μm, so that the resolution of the projection display system is low. In addition, since the optical paths from the MEMS to different positions in the projection plane are different, the optical path difference exists between the MEMS and different positions in the projection plane, which causes the spot size in the projection plane to be deviated, that is, the spot size in the projection plane is inconsistent, and the quality of the projected image is affected.
Therefore, how to provide a projection display system to ensure good uniformity of the spot size in a predetermined projection area while improving the resolution of the projection display system is a problem to be solved in the art.
SUMMERY OF THE UTILITY MODEL
Embodiments of the present application provide a projection display system, which can converge a light beam in advance through a convergence module and form a small-sized light spot in a preset projection area, so as to improve the resolution of the projection display system. Meanwhile, the optical paths from the scanning imaging module to different positions in the preset projection area are the same through the compensation module, the light spot size deviation in the preset projection area is reduced, and the light spot size in the preset projection area is ensured to have good consistency.
According to one aspect of the present application, there is provided a projection display system comprising:
the light source module is used for emitting light beams;
the convergence module is positioned on an emergent light path of the light source module and is used for converging light beams;
a scanning imaging module located on an exit light path of the convergence module and configured to: scanning the light beam to form a first light spot in a preset projection area, wherein the first light spot is used for forming an image;
a compensation module located on an exit optical path of the scanning imaging module and configured to: and compensating the projection light path of the first light spot based on the light path difference from the scanning imaging module to different positions in the preset projection area, and enabling the light paths from the scanning imaging module to different positions in the preset projection area to be the same.
According to an exemplary embodiment of the application, a maximum size of the first light spot within the preset projection area is less than or equal to 150 μm.
According to an exemplary embodiment of the application, the size deviation of the first light spot at different positions within the preset projection area is less than or equal to 10 μm.
According to an exemplary embodiment of the present application, the light source module is configured to emit a plurality of light beams, and a beam combining module is disposed between the converging module and the light source module or the scanning imaging module, and is configured to combine the plurality of light beams to form the same light beam.
According to an exemplary embodiment of the present application, the converging module is located between the beam combining module and the light source module, and each light beam corresponds to one converging module.
According to an exemplary embodiment of the present application, the converging module is located between the beam combining module and the scanning imaging module, and all beams share one converging module.
According to an exemplary embodiment of the present application, a correction lens is disposed on an exit path of the partial light beam, and the correction lens is used for correcting the convergence capability of the convergence module on the partial light beam.
According to an exemplary embodiment of the present application, the light source module is configured to emit a red light beam, a green light beam, and a blue light beam, and a correction lens is disposed on an exit path of the red light beam, and the correction lens is configured to correct a convergence capability of the convergence module on the red light beam.
According to an exemplary embodiment of the present application, the light source module includes a plurality of light sources for emitting light beams, and the plurality of light sources includes a red light source, a green light source, and a blue light source.
According to an exemplary embodiment of the present application, the light beam emitted by the light source module is a collimated light beam.
According to an exemplary embodiment of the present application, a light source module includes:
a plurality of light sources for emitting light;
and the collimating lenses are respectively arranged on the emergent light paths of the corresponding light sources and are used for enabling the light emitted by the corresponding light sources to be uniformly collimated and emitted.
According to an exemplary embodiment of the present application, the plurality of light sources includes a red light source, a green light source, and a blue light source.
According to an exemplary embodiment of the present application, the projection display system further includes a projection screen, and the compensation module is disposed between the projection screen and the scanning imaging module, and the compensation module includes a curved mirror or a compensation lens, and the compensation lens includes a fresnel lens or an F-theta lens.
According to an exemplary embodiment of the present application, the compensation module is a curved projection screen.
According to an exemplary embodiment of the application, the optical path compensation amount of the compensation module is 0-11.5 mm.
According to an exemplary embodiment of the present application, the scanning imaging module is a two-dimensional MEMS scanning mirror; alternatively, the scanning imaging module comprises a one-dimensional MEMS scanning mirror and a Polygon device, and the one-dimensional MEMS scanning mirror and the Polygon device scan in orthogonal X/Y directions simultaneously.
According to an exemplary embodiment of the application, the beam forms a second spot at the scanning imaging module, the second spot having a largest dimension smaller than a dimension of the two-dimensional MEMS scanning mirror or the one-dimensional MEMS scanning mirror.
Compared with the prior art, the beneficial effects of this application are as follows at least:
1) the light source module is arranged on the emergent light path of the light source module, and the light beam can be converged by the convergence module to form small-sized light spots in a preset projection area and improve the resolution of the projection display system.
2) This application sets up compensation module on scanning imaging module's emergent light path, in the formation process of the facula in predetermineeing the projection region, this compensation module can compensate scanning imaging module to predetermineeing the optical path difference of different positions in the projection region, and make scanning imaging module the optical path of predetermineeing different positions in the projection region the same, thereby reduce the size deviation of predetermineeing the facula in the projection region, guarantee that predetermine the facula size in the projection region and have good uniformity, with the quality that improves projection display system projection image.
Drawings
Other features, objects, and advantages involved in the embodiments of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings. Wherein:
FIG. 1 shows a schematic view of a projection display system according to an exemplary embodiment of the present application;
FIG. 2 shows a schematic view of the collimating lens and converging module of FIG. 1;
FIG. 3 shows a schematic diagram of a projection display system according to an exemplary embodiment of the present application;
FIG. 4 shows a schematic view of the collimating lens and the correcting lens of FIG. 3;
FIG. 5 shows a schematic diagram of a projection display system according to an exemplary embodiment of the present application;
FIG. 6 shows a schematic diagram of a projection display system according to an exemplary embodiment of the present application;
FIG. 7 shows a schematic diagram of a projection display system according to an exemplary embodiment of the present application.
Illustration of the drawings:
100 light source modules; 110 light sources; 111 a red light source; 112 green light source; 113 a blue light source; 120 collimating lens; 130 a corrective lens; 200 a beam combining module; 300 scanning the imaging module; 310 one-dimensional MEMS scanning mirror; 320 a Polygon device; 400 a convergence module; 500 a compensation module; 600 projection screen.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.
It should be noted that the expressions first, second, etc. in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, a first spot discussed below may be referred to as a second spot, and a second spot may also be referred to as a first spot, without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of each component may have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Additionally, the use of "exemplary" is intended to mean exemplary or illustrative.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
With the continuous development of projection technology, higher requirements are put forward on the resolution of a projection display system, the size of a light spot in a projection plane is a key factor influencing the resolution of the projection display system, the size of the light spot in the existing projection display system is larger, generally 800-1000 μm, and the resolution of the projection display system is lower. In the prior art, there are several approaches to increasing the resolution of projection display systems. For example, a cylindrical mirror or a combined prism made of a high refractive index material is used to compress the light spot to realize a small-sized light spot, but this method requires more optical devices, is complicated in structure, and is expensive. For another example, a diaphragm is used to shield a part of the light spots to realize the small-sized light spots, but this method has large light energy loss, low light efficiency, and high power consumption of the projection display system under the same projection brightness requirement.
In addition, the optical paths from the MEMS to different positions in the projection plane are different, that is, the optical path difference exists between the MEMS and different positions in the projection plane, which easily causes the spot size in the projection plane to be deviated, and causes the spot size in the projection plane to be inconsistent, thereby affecting the quality of the projected image. For example, the optical paths of the MEMS to the center position and the edge position in the projection plane are different, which causes the spot size at the edge position in the projection plane to be larger than the spot size at the center position in the projection plane, and affects the quality of the projected image.
In order to solve the above technical problem, the inventor designs a novel projection display system to ensure consistent spot size in a preset projection area while improving the resolution of the projection display system. The method specifically comprises the steps that light beams are converged in advance through a convergence module to form small-sized light spots in a preset projection area, the resolution ratio of the projection display system is improved, meanwhile, the optical path difference from a scanning imaging module to different positions in the preset projection area is compensated through a compensation module, the size deviation of the light spots in the preset projection area is reduced, the size of the light spots in the preset projection area is ensured to have good consistency, and the quality of images projected by the projection display system is improved. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
According to one aspect of the present application, a projection display system is provided. Fig. 1, 3, 5 to 7 are schematic views of a projection display system according to an exemplary embodiment of the present application, and the projection display system will be described in detail with reference to the above-described drawings.
As shown in fig. 1, 3, and 5 to 7, the projection display system includes a light source module 100, a convergence module 400, a scanning imaging module 300, and a compensation module 500. The light source module 100 is used to emit a light beam, which is preferably a laser light beam, and the number of light beams is preferably a plurality of beams. The converging module 400 is located on the emergent light path of the light source module 100 and is used for converging the light beams. The scanning imaging module 300 is located on the outgoing light path of the convergence module 400, and is configured to: and scanning the light beam to form a first light spot in a preset projection area, wherein the first light spot is used for forming an image. When the light source module 100 emits a plurality of light beams, the first light spots formed by all the light beams form an image together. The compensation module 500 is located on the outgoing optical path of the scanning imaging module 300 and is configured to: based on the optical path difference from the scanning imaging module 300 to different positions in the preset projection area, the projection optical path of the first light spot is compensated, and the optical paths from the scanning imaging module 300 to the different positions in the preset projection area are the same. It should be noted that the same optical paths refer to substantially the same optical paths, and there may be some deviation in the optical paths.
As an example, the maximum size of the first spot within the above-mentioned preset projection area is preferably less than or equal to 150 μm. The size deviation of the first light spots at different positions in the preset projection area is less than or equal to 10 mu m, so that the maximum sizes of the first light spots have good consistency.
In an embodiment, the distance from the scanning imaging module 300 to the preset projection area is preferably 100mm, and the distance from the scanning imaging module 300 to the preset projection area is only an example, and when the projection display system is applied to different application scenes, the distance may be changed according to the application scenes.
As an example, the light beam emitted from the light source module 100 is preferably a collimated light beam. As shown in fig. 1, 3, and 5 to 7, the light source module 100 includes a plurality of light sources 110 and a plurality of collimating lenses 120, and each light source 110 corresponds to one collimating lens 120. Each light source 110 is used to emit light, preferably laser light, and the wavelength ranges of the light emitted by all the light sources 110 may be completely or partially different. The plurality of collimating lenses 120 are disposed on the light emitting paths of the corresponding light sources 110, and are used for uniformly collimating and emitting the light emitted from the corresponding light sources 110 to form the collimated light beams. The plurality of light sources 110 include, but are not limited to, a red light source, a green light source, and a blue light source.
Illustratively, the light source module 100 includes four light sources 110, and specifically includes one red light source 111, two green light sources 112, and one blue light source 113. The red light source 111 is used for emitting a red light beam with a wave band range of 612nm to 624nm, and the central wavelength of the red light beam is 617 nm. The green light source 112 is used for emitting a green light beam with a wavelength range of 515nm to 530nm, and the central wavelength of the green light beam is 520 nm. The blue light source 113 is used for emitting a blue light beam with a wavelength range of 440nm to 460nm, and the central wavelength of the blue light beam is 450 nm. The number of the light sources 110 and the wavelength band range of the emitted light beam are only exemplary, and the number of the light sources 110 and the wavelength band range of the emitted light beam are not particularly limited in the present application.
The collimating lens 120 is illustratively an aspheric lens, however, other lenses may be used without departing from the teachings of the present application, as long as uniform collimation of the light emitted from the light source 110 can be achieved. In some cases, the collimating lens 120 can also be a single or multi-piece collimating lens, shaped as a spherical or aspherical lens.
Illustratively, the optical axis of each light source 110 and the optical axis of its corresponding collimating lens 120 are on the same axis.
As an example, the light source module 100 includes only a plurality of light sources 110 for emitting light beams, and the plurality of light sources 110 include, but are not limited to, a red light source, a green light source, and a blue light source. Each light source 110 is used to emit a light beam, preferably a laser light beam, and the wavelength ranges of the light beams emitted by all the light sources 110 may be completely different or partially different.
Illustratively, the light source module 100 includes four light sources 110, and specifically includes one red light source 111, two green light sources 112, and one blue light source 113. The red light source 111 is used for emitting a red light beam with a wave band range of 612 nm-624 nm, and the central wavelength of the red light beam is 617 nm. The green light source 112 is used for emitting a green light beam with a wavelength range of 515nm to 530nm, and the central wavelength of the green light beam is 520 nm. The blue light source 113 is used for emitting a blue light beam with a wavelength range of 440nm to 460nm, and the central wavelength of the blue light beam is 450 nm. The number of the light sources 110 and the wavelength band range of the emitted light beam are only exemplary, and the number of the light sources 110 and the wavelength band range of the emitted light beam are not particularly limited in the present application.
As an example, as shown in fig. 1, 3, 5 to 7, a beam combining module 200 is disposed between the converging module 400 and the light source module 100 or the scanning imaging module 300, and the beam combining module 200 is used for combining a plurality of light beams to form a same light beam.
As an example, as shown in fig. 1, the convergence module 400 is located between the beam combining module 200 and the light source module 100, and each light beam corresponds to one convergence module 400. Specifically, the converging module 400 is located between the beam combining module 200 and the collimating lens 120, and one converging module 400 corresponds to each light source 110. The light emitted from each light source 110 is collimated by the collimating lens 120 to form a collimated light beam, the collimated light beams are converged by the converging module 400, all the converged collimated light beams are integrated by the beam combining module 200 to form a light beam, and the light beam can form a small-sized second light spot in the scanning imaging module 300 and a small-sized first light spot in a preset projection area, so that the resolution of the projection display system is improved. In the present embodiment, the converging module 400 is preferably a converging lens. The beam combining module 200 is preferably a beam combining prism.
Illustratively, as shown in fig. 2, the optical axis of each converging module 400 and the optical axis of the collimating lens 120 corresponding thereto are on the same axis. Preferably, the optical axis of each converging module 400, the optical axis of the corresponding collimating lens 120, and the optical axis of the corresponding light source 110 are all on the same axis.
Illustratively, the convergence module 400 corresponding to the green light source and the convergence module 400 corresponding to the blue light source have the same structure.
As an example, as shown in fig. 3, the converging module 400 is located between the beam combining module 200 and the scanning imaging module 300, and all the light beams share one converging module 400, so that the structure of the projection display system can be further simplified, and the cost can be reduced. Specifically, light emitted from each light source 110 is collimated by the collimating lens 120 to form a collimated light beam, then all the collimated light beams are integrated by the beam combining module 200 to form a light beam, the light beam is then converged by the converging module 400, the converged light beam can form a second light spot with a small size in the scanning imaging module 300, and a first light spot with a small size in a preset projection area, so that the resolution of the projection display system is improved. In the present embodiment, the converging module 400 is preferably a converging lens. The beam combining module 200 is preferably a beam combining prism.
For example, as shown in fig. 4, a correction lens 130 is disposed on an exit path of the partial light beam, and specifically, a correction lens 130 is disposed on an exit path of the collimating lens 120 corresponding to the partial light source, where the correction lens 130 is used to correct the converging capability of the converging module 400 on the partial light beam.
When all the light sources 110 share one convergence module 400, because the convergence capabilities of the same convergence module 400 for light beams in different wave band ranges are different, the correction lens 130 needs to be additionally arranged on the emergent light path corresponding to the light beam in a specific wave band to correct the convergence capability of the convergence module 400 for the light beam in the specific wave band, so as to ensure that the sizes of the first light spots corresponding to all the light sources 110 are consistent, and the first light spots have no color fringes, thereby improving the quality of images projected by the projection display system. In this embodiment, a correction lens 130 is preferably disposed on an exit light path of the collimator lens 120 corresponding to the red light source, and the correction lens 130 is used for correcting the convergence capability of the convergence module 400 for the red light beam.
Illustratively, the optical axis of the correction lens 130 and the optical axis of the collimating lens 120 corresponding thereto are all on the same axis.
As an example, as shown in fig. 1, 3, 5 and 6, the scanning imaging module 300 is a two-dimensional MEMS scanning mirror, and a projection display system using the two-dimensional MEMS scanning mirror has the advantages of small size, light weight, low power consumption, small inertia, high resonant frequency, short response time, etc., and can integrate a mechanical movable part, an electronic circuit, a sensor, etc. on one silicon board, so that the space occupied by the mechanical movable part, the electronic circuit, the sensor, etc. is small, the influence of thermal expansion, etc. is small, and the projection display system is intrinsically safer. The projection display system can realize point scanning imaging, and light beams are incident on the two-dimensional MEMS scanning mirror and are selected by the two-dimensional MEMS scanning mirror in a high-speed two-dimensional mode so as to realize point-to-point scanning imaging and enable the projection display system to have high resolution.
Illustratively, the effective reflective area of the two-dimensional MEMS scanning mirror preferably has a diameter of 1-1.5 mm. The rotation angle of the two-dimensional MEMS scanning mirror is preferably + -12 deg. × + -6 deg., which is not particularly limited, but may be other rotation angles.
Illustratively, the maximum size of the second spot needs to be smaller than the size of the two-dimensional MEMS scanning mirror to prevent the second spot from spilling over the two-dimensional MEMS scanning mirror.
As an example, as shown in fig. 7, the scanning imaging module 300 includes one-dimensional MEMS scanning mirror 310 and one Polygon device 320, the one-dimensional MEMS scanning mirror 310 and the Polygon device 320 simultaneously scanning in orthogonal X/Y directions. The diameter of the effective reflection area of the one-dimensional MEMS scanning mirror 310 is preferably 1-1.5 mm, the rotation angle of the one-dimensional MEMS scanning mirror 310 is preferably +/-12 DEG x +/-6 DEG, and the rotation angle is not particularly limited and can be other rotation angles. The Polygon device 320 is an equiangular Polygon device and preferably has 11 reflective surfaces.
Illustratively, the maximum size of the second spot needs to be smaller than the size of the one-dimensional MEMS scanning mirror 310 to prevent the second spot from spilling out of the one-dimensional MEMS scanning mirror 310.
As an example, as shown in fig. 1 and 3, the projection display system further includes a projection screen 600, and a compensation module 500 is disposed between the projection screen 600 and the scanning imaging module 300, and the compensation module 500 is preferably a curved mirror. The curved surface reflector has different bending degrees at different positions, when a light beam enters the curved surface reflector, the curved surface reflector can adjust the light beam, and has a certain convergence effect on the light beam to shorten the optical path of the edge light beam in the light beam, so as to reduce the optical path difference from the scanning imaging module 300 to different positions in the projection screen 600, particularly reduce the optical path difference from the scanning imaging module 300 to the center position and the edge position of the projection screen 600, ensure that the sizes of the first light spot at different positions in the projection screen 600 are similar, and the size of the first light spot has good consistency.
As an example, as shown in fig. 5, the projection display system further includes a projection screen 600, and a compensation module 500 is disposed between the projection screen 600 and the scanning imaging module 300, wherein the compensation module 500 is preferably a compensation lens, and the compensation lens specifically includes a fresnel lens or an F- θ lens. The compensation lens mainly reduces the optical path difference from the scanning imaging module 300 to different positions in the projection screen 600 through the optical path difference between the inside and the outside of the glass and the refraction of the edge of the compensation lens to the light beam, especially reduces the optical path difference from the scanning imaging module 300 to the center position and the edge position of the projection screen 600, and ensures that the sizes of the first light spots at different positions in the projection screen 600 are approximate and the sizes of the first light spots have good consistency.
As an example, as shown in fig. 6 and 7, the compensation module 500 is a curved projection screen. The curved projection screen has different bending degrees at different positions, namely, the distances from different positions in the curved projection screen to the scanning imaging module 300 are different, when a light beam is projected to the curved projection screen according to a preset path, the curved projection screen can reduce the optical path difference from the scanning imaging module 300 to different positions in the curved projection screen, especially reduce the optical path difference from the scanning imaging module 300 to the center position and the edge position of the curved projection screen, so that the sizes of the first light spots at different positions in the curved projection screen are approximate, and the sizes of the first light spots have good consistency.
As an example, the maximum optical path length compensation amount of the compensation module 500 is calculated by the following formula:
wherein h is the maximum optical path compensation amount of the compensation module 500; l is the distance from the scanning imaging module 300 to the preset projection area; theta is the rotation angle of the two-dimensional MEMS scanning mirror or the one-dimensional MEMS scanning mirror in the X direction; delta is the rotation angle of the two-dimensional MEMS scanning mirror or the one-dimensional MEMS scanning mirror in the Y direction.
The specific derivation process of the calculation formula of the maximum optical path length compensation amount is as follows:
the projection size of the light beam in the X direction is as follows: m is 2l × tan2 θ;
the projection size of the light beam in the Y direction is as follows: n is 2l × tan2 δ;
the maximum optical distance from the scanning imaging module 300 to the preset projection area is as follows:
the maximum optical path compensation amount of the compensation module 500 is: h ═ l' -l.
In an embodiment, when l is 100mm, θ is ± 12 °, and δ is ± 6 °, the maximum optical path compensation amount of the compensation module 500 is 11.5mm, that is, the optical path compensation amount of the compensation module 500 is preferably 0 to 11.5 mm.
According to the above technical solution, the converging module 400 is disposed on the emergent light path of the light source module 100, and the converging module 400 can converge the light beam to form a small-sized light spot in the preset projection area and improve the resolution of the projection display system.
In addition, this application sets up compensation module 500 on scanning imaging module 300's outgoing light path, in the formation process of the facula in predetermineeing the projection area, this compensation module 500 can compensate scanning imaging module 300 to predetermineeing the optical path difference of different positions in the projection area, and make scanning imaging module to predetermine the optical path of different positions in the projection area the same, thereby reduce the size deviation of predetermineeing the facula in the projection area, ensure to predetermine the facula size in the projection area and have good uniformity, in order to improve the quality of projection display system projection image.
The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present application, and these modifications and substitutions should also be regarded as the protection scope of the present application.
Claims (17)
1. A projection display system, comprising:
the light source module is used for emitting light beams;
the convergence module is positioned on an emergent light path of the light source module and is used for converging the light beam;
a scanning imaging module located on an exit light path of the convergence module and configured to: scanning the light beam to form a first light spot in a preset projection area, wherein the first light spot is used for forming an image;
a compensation module located on an exit light path of the scanning imaging module and configured to: and compensating the projection light path of the first light spot based on the optical path difference from the scanning imaging module to different positions in the preset projection area, and enabling the optical paths from the scanning imaging module to different positions in the preset projection area to be the same.
2. The projection display system of claim 1 wherein the maximum size of the first spot of light within the predetermined projection area is 150 μm or less.
3. The projection display system of claim 1, wherein the size deviation of the first light spot at different positions in the preset projection area is less than or equal to 10 μm.
4. The projection display system of claim 1, wherein the light source module is configured to emit a plurality of light beams, and a beam combining module is disposed between the converging module and the light source module or the scanning imaging module, and is configured to combine the plurality of light beams to form a same light beam.
5. The projection display system of claim 4, wherein the converging module is located between the beam combining module and the light source module, and one converging module is corresponding to each light beam.
6. The projection display system of claim 4 wherein the convergence module is located between the beam combining module and the scanning imaging module, one for all beams.
7. The projection display system of claim 6, wherein a correction lens is disposed on an exit path of a portion of the light beam, the correction lens being configured to correct a converging capability of the converging module to the portion of the light beam.
8. The projection display system of claim 6, wherein the light source module is configured to emit a red light beam, a green light beam and a blue light beam, and a correction lens is disposed on an exit path of the red light beam, and the correction lens is configured to correct a convergence capability of the convergence module for the red light beam.
9. The projection display system of claim 1, wherein the light source module comprises a plurality of light sources for emitting the light beam, the plurality of light sources comprising a red light source, a green light source, and a blue light source.
10. The projection display system of claim 1, wherein the light beam emitted by the light source module is a collimated light beam.
11. The projection display system of claim 10, wherein the light source module comprises:
a plurality of light sources for emitting light;
and the collimating lenses are respectively arranged on the emergent light paths of the corresponding light sources and are used for enabling the light emitted by the corresponding light sources to be uniformly collimated and emitted.
12. The projection display system of claim 11 wherein the plurality of light sources comprises a red light source, a green light source, and a blue light source.
13. The projection display system of claim 1, further comprising a projection screen, the compensation module disposed between the projection screen and the scanning imaging module, the compensation module comprising a curved mirror or a compensation lens, the compensation lens comprising a fresnel lens or an F-theta lens.
14. The projection display system of claim 1 wherein the compensation module is a curved projection screen.
15. The projection display system of claim 1, wherein the optical path compensation amount of the compensation module is 0-11.5 mm.
16. The projection display system of any of claims 1-15 wherein the scanning imaging module is a two-dimensional MEMS scanning mirror; or the scanning imaging module comprises a one-dimensional MEMS scanning mirror and a Polygon device, and the one-dimensional MEMS scanning mirror and the Polygon device scan in orthogonal X/Y directions simultaneously.
17. The projection display system of claim 16 wherein the beam forms a second spot at the scanning imaging module, the second spot having a largest dimension that is smaller than a dimension of the two-dimensional or one-dimensional MEMS scanning mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220487866.XU CN216870999U (en) | 2022-03-08 | 2022-03-08 | Projection display system |
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| CN202220487866.XU CN216870999U (en) | 2022-03-08 | 2022-03-08 | Projection display system |
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