CN113009759A - Miniature projection display device and AR display system - Google Patents
Miniature projection display device and AR display system Download PDFInfo
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- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
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Abstract
The invention relates to a miniature projection display device, which comprises a projection light source module, a PBS prism, a projection lens module and an imaging chip, wherein the projection light source module is used for emitting first polarized light, the PBS prism is used for reflecting the first polarized light to the imaging chip, the imaging chip is used for modulating the first polarized light into second polarized light, the PBS prism is also used for emitting the second polarized light to the projection lens module, the projection lens module comprises a polarized light conversion device, a reflection-type second condenser lens and an imaging lens group, the polarized light conversion device is used for modulating the second polarized light into an intermediate state and modulating the intermediate state into the first polarized light, the modulated first polarized light is emitted to the PBS prism, the PBS prism is also used for reflecting the first polarized light to the imaging lens group, and the imaging lens group is used for emitting the first polarized light to an optical waveguide; the projection lens module is arranged around the PBS prism, so that the space waste of the projection lens is effectively improved, the space volume of the micro-projection display device is flattened, and the follow-up miniaturized design is facilitated.
Description
Technical Field
The invention relates to the technical field of miniature projectors, in particular to a miniature projection display device and an AR display system.
Background
With the development of semiconductor technology, portable electronic products are increasing, and people have an increasing demand for micro projectors. Currently, LCOS miniature projectors typically include: projection lighting system, PBS polarization beam splitter, LCOS image chip and projecting lens, usually projection lighting system and PBS polarization beam splitter are located the first direction, LCOS image chip, PBS polarization beam splitter and projecting lens are located the second direction, and first direction and second direction are perpendicular, this moment, projection lighting system and projecting lens set up perpendicularly, because projection lighting system's volume and projecting lens's volume are all great, when projection lighting system and projecting lens set up perpendicularly, there is the space vacant between projection lighting system and the projecting lens, cause a large amount of space to waste, and simultaneously, it is great to lead to the projecting apparatus volume, be difficult to accomplish miniature, portable, be more not convenient for cut into AR display system.
Secondly, how to improve the contrast ratio of the LCOS micro-projection display system and reduce the cost of the LCOS micro-projection display system have become technical problems to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a miniature projection display device and an AR display system, aiming at solving the technical problems that in the prior art, when the projection illumination system and the projection lens are vertically arranged, a space is left between the projection illumination system and the projection lens, so that a large amount of space is wasted, and a projector is large in size, difficult to realize miniature, inconvenient to carry and more inconvenient to cut into the AR display system.
The technical scheme provided by the invention is as follows:
a miniature projection display device is applied to the field of augmented reality and comprises: the projection lens module comprises a projection light source module, a PBS prism, a projection lens module and an imaging chip;
the projection light source module is used for emitting first polarized light;
the PBS prism is used for reflecting the first polarized light emitted by the projection light source module to the imaging chip;
the imaging chip is used for modulating the first polarized light reflected by the PBS prism into second polarized light, and the PBS prism is also used for enabling the second polarized light modulated by the imaging chip to be incident to the projection lens module;
the projection lens module includes: a polarized light conversion device, a reflective second condenser lens and an imaging lens group; the polarized light conversion device is used for modulating the second polarized light modulated by the imaging chip into an intermediate state, and the deflected light conversion device is also used for modulating the intermediate state reflected by the reflection-type second condenser lens into the first polarized light and enabling the modulated first polarized light to be incident to the PBS prism;
the PBS prism is further used for reflecting the first polarized light modulated by the polarized light conversion device to the imaging lens group, and the imaging lens group is used for enabling the first polarized light modulated by the polarized light conversion device to be incident to an optical waveguide;
the projection lens module is arranged around the PBS prism.
Further, the projection light source module includes: the device comprises a projection light source, a collimating lens module and a polaroid;
the projection light source is used for generating a light source, and the light source is an LED light source or a laser light source;
the collimating lens module is used for collimating the LED light source or the laser light source emitted by the projection light source;
the polaroid is used for polarizing the LED light source or the laser light source collimated by the collimating lens module into the first polarized light.
Further, the collimating lens group can be replaced by a reflector.
Further, the PBS prism includes: a first right-angle prism, a second right-angle prism, and a first polarized light absorption type polarizing plate;
the inclined surfaces of the first right-angle prism and the second right-angle prism are plated with polarizing films which transmit the second polarized light and reflect the first polarized light, and the first polarized light absorption type polarizing film is arranged between the first right-angle prism and the second right-angle prism and used for absorbing the first polarized light which penetrates through the PBS prism.
Further, the projection lens module further includes: a first condenser lens;
the first condenser lens is arranged between the PBS prism and the imaging chip and is tightly attached to the PBS prism;
the first condenser lens is used for focusing the first polarized light emitted by the projection light source module.
Further, the reflective material is a highly reflective film.
Further, the imaging chip is an LCOS chip with a color filter.
Further, the miniature projection display device further comprises: 1/4 wave plate and analyzer;
the 1/4 wave plate is used for filtering stray light in the first polarized light reflected by the PBS prism;
the analyzer is used for detecting the first polarized light of which the stray light is filtered by the 1/4 wave plate;
the analyzer and the 1/4 wave plate are sequentially arranged between the first condenser lens and the PBS prism and are tightly attached to the PBS prism and the first condenser lens.
Further, the first polarized light is S polarized light, and the second polarized light is P polarized light.
The invention also provides an AR display system which comprises the miniature projection display device.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a miniature projection display device, which is applied to the field of augmented reality and comprises: projection light source module, PBS prism, projection lens module and imaging chip, projection light source module is used for the first polarized light of outgoing, the PBS prism is used for reflecting the first polarized light of projection light source module outgoing to imaging chip, imaging chip is used for modulating the first polarized light of PBS prism reflection into the second polarized light, the PBS prism still is used for the second polarized light after imaging chip modulation to incide to projection lens module, the projection lens module includes: the polarized light conversion device is used for modulating second polarized light modulated by the imaging chip into an intermediate state, the deflection light conversion device is also used for modulating the intermediate state reflected by the reflection type second condenser into first polarized light and enabling the modulated first polarized light to be incident to the PBS prism, the PBS prism is also used for reflecting the first polarized light modulated by the polarized light conversion device to the imaging lens group, and the imaging lens group is used for enabling the first polarized light modulated by the polarized light conversion device to be incident to the optical waveguide; wherein, the projection lens module is arranged around the PBS prism. The micro projection display device provided by the invention effectively solves or improves the space waste of the projection lens to a certain extent, so that the space volume of the micro projection display system is more flattened, the subsequent miniaturization design is convenient, and the integrated design of rear-end AR glasses is more facilitated.
2. The invention provides a micro projection display device, which effectively absorbs the influence of ineffective first polarized light on system stray light by arranging a first polarized light absorption type polarizing film between PBS prisms, thereby improving the contrast of the micro projection display device.
3. The invention provides a miniature projection display device, which effectively replaces the technical scheme of adopting two aspheric collimating lenses by adopting a means of collimating and focusing light collection of an illumination light source by adopting a reflector, thereby reducing the manufacturing cost of the miniature projection display device.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a micro projection display device according to a first embodiment of the invention;
FIG. 2 is a schematic view of a micro projection display device according to a second embodiment of the present invention;
FIG. 3 is a schematic view of a micro projection display device according to a third embodiment of the present invention;
FIG. 4 is a schematic view of a micro projection display device according to a fourth embodiment of the present invention;
FIG. 5 is a schematic diagram of an arrangement of projection lenses of a conventional projector;
wherein: 100-an LED light source; 101-a first collimating lens; 102-a second collimating lens; 103-polarizer; 104-PBS prism; 104-1: a first right-angle prism; 104-2: a second right-angle prism; 104-3: a first polarized light absorption type polarizing plate; 105-1/4 wave plates; 106-analyzer; 107-first condenser; 108-LCOS chip; 109-a polarized light conversion device; 110-reflective second condenser; 111-an imaging lens group; 112-aperture diaphragm; 113-a diffractive optical waveguide; 114-human eye;
300-1: a red LED light source; 300-2: a green LED light source; 300-3: a blue LED light source; 301-collimating lens one; 302-a second collimating lens; 303-3: a total reflection mirror; 303-2: a blue-transmitting and red-green dichroic mirror; 303-1: a blue-green transmitting and red reflecting dichroic mirror; 304-fly eye lens; 305-a first condenser; 306-a polarizer; 307-PBS prism; 307-1: a first right-angle prism; 307-2: a second right-angle prism; 307-3: a first polarized light absorption type polarizing plate; 308-1/4 wave plates; 309-analyzer; 310-a second condenser lens; 311-LCOS chip; 312-a polarized light conversion device; 313-a reflective lens; 314-an imaging lens group; 315-aperture stop; 316-a diffractive optical waveguide; 317-human eye;
400-1: a red LED light source; 400-2: a green LED light source; 400-3: a blue LED light source; 401-a collimating lens one; 402-a second collimating lens; 403-2: a blue-reflecting red-green dichroic mirror; 403-1: a red-reflecting blue-green dichroic mirror; 404-fly eye lens; 405-a first condenser; 406-a polarizer; 407-PBS prism; 407-1: a first right-angle prism; 407-2: a second right-angle prism; 407-3: a first polarized light absorption type polarizing plate; 408-1/4 wave plates; 409-analyzer; 410-a second condenser; 411-LCOS chip; 412-a polarized light conversion device; 413-a reflective lens; 414-an imaging lens group; 415-aperture stop; 416-a diffractive optical waveguide; 417-human eye;
200-LED light source; 201-reflector; 202-a first collection optic; 203-polarizing plate; 204-PBS prism; 204-1: a first right-angle prism; 204-2: a second right-angle prism; 204-3: a first polarized light absorption type polarizing plate; 205-1/4 wave plates; 206-an analyzer; 207-a second condenser; 208-LCOS chip; 209-polarized light conversion device; 210-a reflective lens; 211-an imaging lens group; 212-aperture stop; 213-a diffractive optical waveguide; 214-human eye.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
At present, with the development of semiconductor technology, portable electronic products are increasing, and people have an increasing demand for micro projectors. Currently, LCOS miniature projectors typically include: projection lighting system, PBS polarization beam splitter prism, LCOS imaging chip and projecting lens, because projection lighting system's volume and projecting lens's volume are all great, when projection lighting system and projecting lens set up perpendicularly, there is the space vacant between projection lighting system and the projecting lens, cause a large amount of space extravagant, simultaneously, lead to the projecting apparatus volume great, be difficult to accomplish miniature, portable not more, more be not convenient for cut into AR display system.
In order to solve the problems, the projection lens module is spatially folded around the PBS prism, namely the projection lens module is arranged around the PBS prism, so that the space waste of the projection lens is greatly reduced, the space volume of the micro-projection display system is more flattened, the subsequent miniaturized design is facilitated, and the integrated design of rear-end AR glasses is facilitated.
Fig. 1 is a schematic view of a micro projection display device according to a first embodiment of the present invention; FIG. 2 is a schematic view of a micro projection display device according to a second embodiment of the present invention; FIG. 3 is a schematic view of a micro projection display device according to a third embodiment of the present invention; FIG. 4 is a schematic view of a micro projection display device according to a fourth embodiment of the present invention; fig. 5 is a schematic diagram of an arrangement of projection lenses of a conventional projector.
As shown in fig. 1, the present invention provides a micro projection display device, which is applied in the field of implementation enhancement, and comprises: the projection light source module, the PBS prism 104, the projection lens module and the imaging chip;
the projection light source module is used for emitting first polarized light;
the PBS prism 104 is used for reflecting the first polarized light emitted by the projection light source module to
An imaging chip;
the imaging chip is used for modulating the first polarized light reflected by the PBS prism 104 into second polarized light, and the PBS prism 104 is also used for transmitting the second polarized light modulated by the imaging chip to the projection lens module;
the projection lens module includes: a polarization light conversion device 109, a reflective second condenser lens 110, and an imaging lens group 111; the polarized light conversion device 109 is configured to modulate the second polarized light modulated by the imaging chip into an intermediate state, the polarized light conversion device 109 is further configured to modulate the intermediate state reflected by the reflective second condenser 110 into a first polarized light, and the modulated first polarized light is incident to the PBS prism 104;
the PBS prism 104 is further configured to reflect the first polarized light modulated by the polarized light conversion device 109 to the imaging lens group 111, and the imaging lens group 111 is configured to inject the first polarized light modulated by the polarized light conversion device 109 into the optical waveguide;
the projection lens module is disposed around the PBS prism 104. The projection lens module is arranged around the PBS prism 104, so that the space waste of the projection lens is effectively solved or improved to a certain extent, the space volume of the micro-projection display system is more flattened, the subsequent miniaturization design is facilitated, and the integrated design of rear-end AR glasses is facilitated.
Further, the projection light source module includes: a projection light source, a collimating lens group, and a polarizing plate 103;
the projection light source is used for generating a light source, and the generated light source is an LED light source 100 or a laser light source;
the collimating lens group is used for collimating the LED light source 100 or the laser light source emitted by the projection light source;
the polarizer 103 is used for polarizing the LED light source 100 or the laser light source collimated by the collimating lens group into first polarized light. Wherein, the collimating lens group can be replaced by a reflector 201.
Furthermore, the projection light source can generate natural light, and is characterized by low power, long service life, energy saving, environmental protection and slow light source decay, and the emitted light does not contain infrared rays and ultraviolet rays. The present invention takes a projection light source as the LED light source 100 and the RGB multi-chip integrated LED light source 100 to perform the description of different embodiments.
Further, the PBS prism 104 includes: a first right-angle prism 104-1, a second right-angle prism 104-2, and a first polarized light absorption type polarizing plate 104-3;
the inclined surfaces of the first and second right-angle prisms 104-1 and 104-2 are plated with a polarizing film that transmits the second polarized light and reflects the first polarized light, and a first polarized light absorbing polarizer 104-3 is disposed between the first and second right-angle prisms 104-1 and 104-2 to absorb the first polarized light transmitted through the PBS prism 104.
Due to the technical and technological influences, the polarization efficiency of the polarizing film of the PBS prism 104 can only reach a limited value, therefore, a certain part of first polarized light obtained by polarizing through the polarizing film 103 can penetrate through the PBS prism 104 and enter the projection lens module after passing through the PBS prism 104, so that a light leakage phenomenon (stray light) occurs, and the contrast of the micro projection display device is reduced, and in the patent, the first polarized light absorption type polarizing film 104-3 is added between the PBS prisms 104, so that the first polarized light penetrating through the PBS prism 104 can be effectively absorbed, and the contrast of the micro projection display device is greatly improved; meanwhile, the first polarized light converted by the polarized light converter 109 also passes through the second right-angle prism 104-2 with a certain probability and is incident to the projection lens module through multiple reflection, thereby causing ghost stray light, and the patent can effectively absorb the stray light by adding the first polarized light absorption type polaroid 104-3 between the PBS prisms 104, thereby effectively reducing the stray light of the micro projection display device and further improving the contrast of the micro projection display device.
Further, the projection lens module includes: a first condenser lens 107;
the first condenser 107 is arranged between the PBS prism 104 and the imaging chip and is tightly attached to the PBS prism 104;
the first condenser 107 is used for focusing the first polarized light emitted by the projection light source module.
The reflective material is a high reflective film, and the imaging chip includes an LCOS chip 108 with a color filter or an ordinary LCOS chip 108.
Further, the miniature projection display device further comprises: 1/4 wave plate 105 and analyzer 106;
1/4 wave plate 105 is used to filter out stray light in the first polarized light reflected by PBS prism 104; the analyzer 106 is used for detecting the first polarized light of which the stray light is filtered by the 1/4 wave plate 105; the analyzer 106 and the 1/4 wave plate 105 are sequentially disposed between the first condenser 107 and the PBS prism 104, and closely attached to the PBS prism 104 and the first condenser 107.
Further, the miniature projection display device further comprises: an aperture stop 112; the aperture stop 112 is used to intercept the first polarized light polarized by the polarized light conversion device 109, and then reflect the ineffective light or stray light incident into the light source of the diffraction light waveguide 113 through the PBS prism 104.
Further, the first polarized light may be S-polarized light or P-polarized light, and correspondingly, when the first polarized light is S-polarized light, the second polarized light is P-polarized light; when the first polarized light is P polarized light, the second polarized light is S polarized light, and the light splitting surface of the PBS prism 104 can exhibit different transmission and reflection functions according to different coating processes, for example, the PBS prism 104 can transmit P polarized light and reflect S polarized light, or transmit S polarized light and reflect P polarized light, and the PBS prism 104 capable of transmitting P polarized light and reflecting S polarized light is adopted in the present invention.
The working principle of the first embodiment of the invention is as follows: when the projection light source is an LED light source 100, the LED light source 100 is collimated by a first collimating lens 101 and a second collimating lens 102, polarized by a polarizer 103 to obtain S-polarized light, and then sequentially passes through a PBS prism 104, where the PBS prism 104 includes: a first right-angle prism, a second right-angle prism and a first polarized light absorption type polarizer, wherein the inclined planes of the first right-angle prism and the second right-angle prism are plated with a polarizing film which transmits the P polarized light and reflects the S polarized light, 1/4 wave plate 105, analyzer 106, first condenser 107 is incident on LCOS chip 108, the S polarized light is modulated by LCOS chip 108 to become P polarized light and is reflected to pass through first condenser 107, analyzer 106, 1/4 wave plate 105, PBS prism 104, the P polarized light is transmitted by PBS prism 104 and reflects the S polarized light, polarization conversion device 109, reflection type second condenser 110, the surface of reflection type second condenser 110 far away from PBS prism 104 is plated with a high reflection film, LED light source 100 is reflected by reflection type second condenser 110, and when passing through polarization conversion device 109 again, the P polarized light is converted into S polarized light, and then passes through PBS prism 104, the imaging lens group 111 is incident on the diffractive light waveguide 113, and is not limited to the diffractive light waveguide 113, but may be one of an array light waveguide and a geometric light waveguide, and preferably, the diffractive light waveguide 113 is used, and the LED light source 100 is transmitted inside the diffractive light waveguide 113 and finally incident on the human eye 114 from the other side of the diffractive light waveguide 113.
Example two
As shown in fig. 2, the second embodiment of the present invention has the following working principle: when the projection light source is an RGB multi-chip integrated LED light source, that is, the projection light source includes: the LED light source comprises a red light LED light source 300-1, a green light LED light source 300-2 and a blue light LED light source 300-3, when the red light, the green light and the blue light LED light sources are collimated by a first collimating lens 301 and a second collimating lens 302, a beam of incident light is formed by respectively passing through a blue-green-transmitting and red-reflecting dichroic mirror 303-1, a blue-transmitting and red-green-reflecting dichroic mirror 303-2 and a total reflecting mirror 303-3, and then is condensed by a fly eye lens 304 and a first condenser 305; polarizing by a polarizer 306 to obtain S-polarized light, sequentially passing through a PBS prism 307 (transmitting P-polarized light and reflecting S-polarized light), 1/4 a wave plate 308, an analyzer 309, a second condenser 310 to enter an LCOS chip 311, the S-polarized light is changed into P-polarized light by the LCOS chip 311 and then reflected to sequentially pass through the second condenser 310, the analyzer 309, 1/4 a wave plate 308, the PBS prism 307 (transmitting P-polarized light and reflecting S-polarized light), a polarization conversion device 312, a reflective lens 313 with a high reflective film on a surface thereof away from the PBS prism 307, an illumination beam reflected by the reflective lens 313, and then passing through the polarization converter 312 again to convert the P-polarized light into S-polarized light, and then passing through the PBS prism 307, an imaging lens group 314 to enter a diffraction light waveguide 316, which is not limited to the diffraction light waveguide 316, but may be one of an array light waveguide and a geometric light waveguide, preferably, a diffractive optical waveguide 316 is used, and the light beam is transmitted inside the diffractive optical waveguide 316 and finally incident to the human eye 317 from the other side of the diffractive optical waveguide 316.
EXAMPLE III
Similar to the second embodiment, as shown in fig. 3, the third embodiment of the present invention has the following working principle: when the projection light source is an RGB multi-chip integrated LED light source, that is, the projection light source includes: the LED light source comprises a red light LED light source 400-1, a green light LED light source 400-2 and a blue light LED light source 400-3, when the red light LED light source, the green light LED light source and the blue light LED light source are collimated by a first collimating lens 401 and a second collimating lens 402, a beam of incident light is formed by a red-reflecting blue-green dichroic mirror 403-1 and a blue-reflecting red-green dichroic mirror 403-2 respectively, and then the incident light is condensed by a fly-eye lens 404 and a first condenser lens 405; polarizing by a polarizer 406 to obtain S-polarized light, sequentially passing through a PBS prism 407 (transmitting P-polarized light and reflecting S-polarized light), 1/4 a wave plate 408, an analyzer 409, a second condenser 410 to be incident on the LCOS chip 411, the S-polarized light being changed into P-polarized light by the LCOS chip 411 and reflected sequentially by the second condenser 410, the analyzer 409, 1/4 a wave plate 408, the PBS prism 407 (transmitting P-polarized light and reflecting S-polarized light), a polarization conversion device 412, a reflective lens 413 with a high reflective film coated on a side of the reflective lens 413 away from the PBS prism 407, the illumination beam being reflected by the reflective lens 413, and when passing through the polarization converter 412 again, the P-polarized light being converted into S-polarized light, then passing through the PBS prism 407, the imaging lens group 414 being incident on the diffraction light waveguide 416, and not limited to the diffraction light waveguide 416, but being one of an array light waveguide and a geometric light, preferably, a diffractive optical waveguide 416 is used, and the light beam is transmitted inside the diffractive optical waveguide 416 and finally incident to the human eye 417 from the other side of the diffractive optical waveguide 416.
Example four
Similar to the embodiment, as shown in fig. 4, the working principle of the fourth embodiment of the present invention is as follows: when the projection light source is an LED light source 200, the LED light source 200 pre-processes and collimates the large-angle light by a reflector 201, the LED light source 200 is condensed by a first condenser 202, and is polarized by a polarizer 203 to obtain S-polarized light, and then the S-polarized light sequentially passes through a PBS prism 204 (transmitting P-polarized light and reflecting S-polarized light), a 1/4 wave plate 205, an analyzer 206, and a second condenser 207 to be incident on an LCOS chip 208, the S-polarized light is changed into P-polarized light by the LCOS chip 208 and is reflected to sequentially pass through the second condenser 207, the analyzer 206, a 1/4 wave plate 205, a PBS prism 204 (transmitting P-polarized light and reflecting S-polarized light), a polarization conversion device 209, a reflective lens 210, a high reflective film coated on a side of the reflective lens 210 away from the PBS prism 204, the LED light source 200 is reflected by the reflective lens 210, and is converted into S-polarized light when passing through the polarization converter, then, the imaging lens group 211 is incident on the diffraction light waveguide 213 through the PBS prism 204, and is not limited to the diffraction light waveguide 213, but may be one of an array light waveguide and a geometric light waveguide, and preferably, the diffraction light waveguide 213 is used, and the LED light source 200 is transmitted in the diffraction light waveguide 213 and finally enters the human eye 214 from the other side of the diffraction light waveguide 213.
In another aspect, the present invention further provides an AR display system, including the micro projection display device in the above embodiment.
The various embodiments described above are merely descriptions of a micro-projection device. It can be understood that the technical scheme of the invention is not only used for a micro projection display device, but also can be applied to various optical systems to reduce space waste, and simultaneously, the space volume of the optical system is more flattened, so that the subsequent miniaturization design is convenient, and the invention can be applied to a photocuring printer, for example.
As described above, the advantageous effects of the present invention include at least: the projection lens module is arranged around the PBS prism. The micro projection display device provided by the invention effectively solves or improves the space waste of the projection lens to a certain extent, so that the space volume of the micro projection display system is more flattened, the subsequent miniaturization design is convenient, and the integrated design of rear-end AR glasses is more facilitated.
The basic principles of the present invention have been described above with reference to specific embodiments, but it should be noted that the advantages, effects, etc. mentioned in the present invention are only examples and are not limiting, and the advantages, effects, etc. must not be considered to be possessed by various embodiments of the present invention. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the invention is not limited to the specific details described above.
The block diagrams of the devices and apparatuses referred to in the present invention are only used as illustrative examples and are not intended to require or imply that the devices and apparatuses must be connected, arranged, or configured in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art will appreciate that various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention is included in the scope of the claims of the present invention filed as filed.
Claims (10)
1. A miniature projection display device is applied to the field of augmented reality, and is characterized by comprising: the projection lens module comprises a projection light source module, a PBS prism, a projection lens module and an imaging chip;
the projection light source module is used for emitting first polarized light;
the PBS prism is used for reflecting the first polarized light emitted by the projection light source module to the imaging chip;
the imaging chip is used for modulating the first polarized light reflected by the PBS prism into second polarized light, and the PBS prism is also used for enabling the second polarized light modulated by the imaging chip to be incident to the projection lens module;
the projection lens module includes: a polarized light conversion device, a reflective second condenser lens and an imaging lens group; the polarized light conversion device is used for modulating the second polarized light modulated by the imaging chip into an intermediate state, and the deflected light conversion device is also used for modulating the intermediate state reflected by the reflection-type second condenser lens into the first polarized light and enabling the modulated first polarized light to be incident to the PBS prism;
the PBS prism is further used for reflecting the first polarized light modulated by the polarized light conversion device to the imaging lens group, and the imaging lens group is used for enabling the first polarized light modulated by the polarized light conversion device to be incident to an optical waveguide;
the projection lens module is arranged around the PBS prism.
2. The micro projection display device according to claim 1, wherein the projection light source module comprises: the device comprises a projection light source, a collimating lens module and a polaroid;
the projection light source is used for generating a light source, and the light source is an LED light source or a laser light source;
the collimating lens module is used for collimating the LED light source or the laser light source emitted by the projection light source;
the polaroid is used for polarizing the LED light source or the laser light source collimated by the collimating lens module into the first polarized light.
3. The miniature projection display device of claim 2, wherein said collimating lens group is replaceable with a reflector.
4. The miniature projection display device of claim 1 or 2, wherein said PBS prism comprises: a first right-angle prism, a second right-angle prism, and a first polarized light absorption type polarizing plate;
the inclined surfaces of the first right-angle prism and the second right-angle prism are plated with polarizing films which transmit the second polarized light and reflect the first polarized light, and the first polarized light absorption type polarizing film is arranged between the first right-angle prism and the second right-angle prism and used for absorbing the first polarized light which penetrates through the PBS prism.
5. The miniature projection display device of claim 4, wherein said projection lens module further comprises: a first condenser lens;
the first condenser lens is arranged between the PBS prism and the imaging chip and is tightly attached to the PBS prism;
the first condenser lens is used for focusing the first polarized light emitted by the projection light source module.
6. The miniature projection display device of claim 5, wherein said reflective material is a highly reflective film.
7. The miniature projection display device of claim 1, wherein said imaging chip is an LCOS chip with a color filter.
8. The miniature projection display device of claim 5, further comprising: 1/4 wave plate and analyzer;
the 1/4 wave plate is used for filtering stray light in the first polarized light reflected by the PBS prism;
the analyzer is used for detecting the first polarized light of which the stray light is filtered by the 1/4 wave plate;
the analyzer and the 1/4 wave plate are sequentially arranged between the first condenser lens and the PBS prism and are tightly attached to the PBS prism and the first condenser lens.
9. The miniature projection display device of claims 1-8, wherein said first polarized light is S polarized light and said second polarized light is P polarized light.
10. An AR display system, comprising: the miniature projection display device of any one of claims 1-9.
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