CN214669890U - Polarization beam splitter prism and near-to-eye display system - Google Patents

Abstract

The embodiment of the utility model provides a relate to optics technical field, in particular to polarization beam splitting prism and near-to-eye display system. The embodiment of the utility model provides a polarization beam splitter prism and a near-to-eye display system, the polarization beam splitter prism comprises a first triangular prism and a second triangular prism, and is provided with a first incident surface, a second incident surface and an emergent surface, the first gluing surface is a polarization beam splitting surface, the third side surface adjacent to the apex angle of the second triangular prism is a reflecting surface, the polarization beam splitter prism can reflect the light in the first polarization state incident from the first incident surface to the second incident surface through the polarization beam splitting surface and transmit the light in the second polarization state incident from the second incident surface to the reflecting surface, meanwhile, the light in the second polarization state is reflected to the emergent surface through the reflecting surface to be emergent, the light path is folded, when the polarization beam splitter prism is applied to a near-to-eye display system, the optical machine center and the lens center of the AR glasses do not need to be on the same horizontal plane, the system complexity is reduced, and the volume and the mass of the device are reduced.

Description

Polarization beam splitter prism and near-to-eye display system

Technical Field

The embodiment of the utility model provides a relate to optics technical field, in particular to polarization beam splitting prism and near-to-eye display system.

Background

Near-eye display systems, also known as head-mounted displays, originally originated in the field of air force, mainly to solve the problem of the great amount of information collected by the increasingly sophisticated instrumentation and weapons systems on board the aircraft, by means of which all the information of the instruments can be presented in the field of view in front of the pilot, concentrating his efforts on operating the aircraft and aiming. With the study and knowledge of people on near-eye display products, the application field of the near-eye display products is also continuously expanded. In the civil aspect, the method is mainly combined with related virtual technologies and applied to education and training; exhibition and promotion of commercial products; simulation training of medicine, etc.

However, in the existing near-eye display system, on one hand, the number of used optical elements is large, and meanwhile, the system is complex, so that the volume of the device is not easy to reduce; on the other hand, when designing AR glasses, the optical engine needs to be combined with the glasses legs, please refer to fig. 1, in order to ensure that the center of the picture is located at the center of the lens 3, the center of the optical engine 2 and the center of the lens 3 of the AR glasses need to be designed on the same horizontal plane, which results in thicker glasses legs 1 and heavier overall device of the AR glasses.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a polarization beam splitter prism of collapsible light path, when this polarization beam splitter prism was applied to near-to-eye display system, can make on the ray apparatus center of AR glasses need not same horizontal plane with the lens center, reduce system complexity and alleviate device volume and quality.

In a first aspect, an embodiment of the present invention provides a method for processing a semiconductor device, comprising: provided is a polarization splitting prism including: a first triangular prism and a second triangular prism; the first triangular prism and the second triangular prism are both isosceles triangular prisms; the polarization splitting prism is provided with a first incident surface, a second incident surface and an emergent surface, the first incident surface is a first side surface adjacent to the apex angle of the first triangular prism, the second incident surface is a second side surface adjacent to the apex angle of the first triangular prism, and the emergent surface is a first side surface opposite to the apex angle of the second triangular prism; a third side surface opposite to the vertex angle of the first triangular prism is attached to a second side surface adjacent to the vertex angle of the second triangular prism to form a first adhesive surface, the first adhesive surface is a polarization beam splitting surface, and the third side surface adjacent to the vertex angle of the second triangular prism is a reflecting surface; the first bonding surface is used for reflecting the light in the first polarization state incident from the first incident surface to the second incident surface for emergence, and is used for transmitting the light in the second polarization state incident from the second incident surface to the reflecting surface; the reflecting surface is used for reflecting the light in the second polarization state to the emergent surface for emergence.

In some embodiments, the polarization splitting prism further comprises a third triangular prism; the first side face of the third triangular prism is attached to a third side face adjacent to the vertex angle of the second triangular prism to form a second adhesive face; the second bonding surface is the reflecting surface.

In some embodiments, the first and second triangular prisms are isosceles right angle prisms.

In a second aspect, the present invention further provides a near-eye display system, including the polarization splitting prism as described in any one of the above first aspects.

In some embodiments, the near-eye display system further comprises an illumination unit, a display unit, and an optical waveguide; the illumination unit is arranged on a first incident surface of the polarization beam splitter prism and used for providing a light source for the display unit; the display unit is arranged on a second incidence surface of the polarization splitting prism and used for providing image information; the optical waveguide is arranged on the emergent surface of the polarization splitting prism.

In some embodiments, the near-eye display system further comprises at least one imaging lens disposed between the display unit and the second entrance face and/or between the exit face and the optical waveguide, the imaging lens for shaping light.

In some embodiments, the near-eye display system further comprises a polarizer disposed between the illumination unit and the first entrance face.

In some embodiments, the illumination unit comprises an LED light source and at least one illumination lens; the LED light source, the at least one illuminating lens, the polarizing plate and the first incident surface are sequentially arranged along a first optical axis.

In some embodiments, the illumination unit further comprises a microlens array disposed between the illumination lens and the polarizer along the first optical axis.

In some embodiments, the optical waveguide is a geometric array optical waveguide or a diffractive optical waveguide.

Compared with the prior art, the beneficial effects of the utility model are that: in contrast to the prior art, embodiments of the present invention provide a polarization splitting prism and a near-to-eye display system, the polarization beam splitter prism comprises a first triangular prism and a second triangular prism, and is provided with a first incident surface, a second incident surface and an emergent surface, the first bonding surface is a polarization beam splitting surface, a third side surface adjacent to the apex angle of the second triangular prism is a reflecting surface, the polarization beam splitter prism can reflect the light in the first polarization state incident from the first incident surface to the second incident surface through the polarization beam splitting surface and transmit the light in the second polarization state incident from the second incident surface to the reflecting surface, meanwhile, the light in the second polarization state is reflected to the emergent surface through the reflecting surface to be emergent, the light path is folded, when the polarization beam splitter prism is applied to a near-to-eye display system, the optical machine center and the lens center of the AR glasses do not need to be on the same horizontal plane, the system complexity is reduced, and the volume and the mass of the device are reduced.

Drawings

One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.

Fig. 1 is a schematic structural diagram of AR glasses provided in the prior art;

fig. 2 is a schematic cross-sectional view of a polarization splitting prism according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the optical path of FIG. 2;

fig. 4(1) is a schematic cross-sectional view of another polarization splitting prism provided in the embodiment of the present invention;

FIG. 4(2) is a schematic diagram of the optical path of FIG. 4 (1);

fig. 5 is a schematic structural diagram of a near-eye display system according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the optical path of FIG. 5;

fig. 7 is a schematic structural diagram of AR glasses according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another near-eye display system provided in an embodiment of the present invention;

FIG. 9 is a schematic illustration of an optical path of FIG. 8;

fig. 10 is a schematic structural diagram of another near-eye display system according to an embodiment of the present invention;

FIG. 11 is a schematic view of the optical path of FIG. 10;

FIG. 12 is a schematic top view of the optical waveguide of FIG. 10 illustrating the optical path;

FIG. 13 is another schematic illustration of the optical path of FIG. 10;

fig. 14 is a schematic structural diagram of another near-eye display system according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all 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. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, if not conflicted, the various features of the embodiments of the invention can be combined with each other and are within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.

The embodiment of the present invention provides a polarization splitting prism, please refer to fig. 2, the polarization splitting prism 10 includes: a first triangular prism 11 and a second triangular prism 12; the first triangular prism 11 and the second triangular prism 12 are both isosceles triangular prisms; the polarization splitting prism 10 has a first incident surface 110, a second incident surface 120 and an exit surface 130, the first incident surface 110 is a first side surface adjacent to the vertex angle θ 1 of the first triangular prism 11, the second incident surface 120 is a second side surface adjacent to the vertex angle θ 1 of the first triangular prism 11, and the exit surface 130 is a first side surface opposite to the vertex angle θ 2 of the second triangular prism 12; a third side surface opposite to the vertex angle theta 1 of the first triangular prism 11 is attached to a second side surface adjacent to the vertex angle theta 2 of the second triangular prism 12 to form a first adhesive surface, the first adhesive surface is a polarization splitting surface 101, and a third side surface adjacent to the vertex angle theta 2 of the second triangular prism is a reflecting surface 102; the first bonding surface is used for reflecting the light in the first polarization state incident from the first incident surface 110 to the second incident surface 120 for emission, and for transmitting the light in the second polarization state incident from the second incident surface 120 to the reflecting surface 102; the reflecting surface 102 is used for reflecting the light in the second polarization state to the exit surface 130 for exiting.

Specifically, the polarization directions of the first polarization state and the second polarization state are perpendicular to each other. The polarization splitting surface 101 may be a wire grid type polarization splitting surface or a film coated type polarization splitting surface. For example, the first bonding surface may be plated with a polarization splitting film, or a metal wire grid or a glass wire grid may be attached to the first bonding surface. The reflective surface may be an Al film, an Ag film, a dielectric film, a reflective film with polarization maintaining property, or any other suitable reflective film, which is not limited herein.

Referring to fig. 2 and fig. 3, the polarization beam splitter 10 can reflect the light of the first polarization state incident from the first incident surface 110 to the second incident surface 120 through the first bonding surface for exiting, and transmit the light of the second polarization state incident from the second incident surface 120 to the reflection surface 102; meanwhile, the polarization splitting prism 10 may reflect the light of the second polarization state transmitted by the second incident surface 120 to the exit surface 130 through the reflection surface 102, wherein a solid line represents the light path of the first polarization state and a dotted line represents the light path of the second polarization state. Therefore, the polarization beam splitter prism 10 can be used for folding light paths in different polarization states, and further can be applied to folding light paths in a near-to-eye display system, and the AR glasses are designed through the polarization beam splitter prism, so that the center of an optical machine and the center of a lens do not need to be on the same horizontal plane, the complexity of the near-to-eye display system can be further reduced, and the size and the mass of the device can be favorably reduced.

In some embodiments, please refer to fig. 4(1), the polarization beam splitter 10 further includes a third triangular prism 13; the first side surface of the third triangular prism 13 and the third side surface adjacent to the vertex angle θ 2 of the second triangular prism 12 are attached to form a second adhesive surface, and the second adhesive surface is a reflecting surface 102. At this time, referring to fig. 4(2), in the polarization beam splitter 10, the light in the first polarization state incident from the first incident surface 110 is reflected to the second incident surface 120 through the polarization beam splitting surface 101 for being emitted, and the light in the second polarization state incident from the second incident surface 120 is transmitted to the reflection surface 102; the reflecting surface 102 reflects the light of the second polarization state transmitted by the second incident surface 120 to the exit surface 130 for exiting.

It should be noted that the cross sections of the first triangular prism 11 and the upper and lower bottom surfaces of the first triangular prism 11 are parallel and equal to each other, and similarly, the second triangular prism 12 and the third triangular prism 13 should be the same.

In some embodiments, please continue to refer to fig. 4(1), the first triangular prism 11, the second triangular prism 12, and the third triangular prism 13 are all right-angle prisms, i.e., θ 1, θ 2, and θ 3 are all right angles. In some of the embodiments, the first triangular prism 11 and the third triangular prism 13 have the same size, and further, the side edge length of the second triangular prism 12 is the same as the side edge length of the first triangular prism 11, and the first side surface adjacent to the vertex angle θ 2 of the second triangular prism 12 is completely attached to the third side surface opposite to the vertex angle θ 1 of the first triangular prism 11, that is, the first right-angle side of the right-angled triangle at the bottom of the second triangular prism 12 is equal to the hypotenuse of the right-angled triangle at the bottom of the first triangular prism 11, and similarly, the second side surface adjacent to the vertex angle θ 2 of the second triangular prism 12 is completely attached to the side surface opposite to the vertex angle θ 3 of the third triangular prism 12, that is, the second side of the right-angled triangle at the bottom of the second triangular prism 12 is equal to the hypotenuse of the bottom of the third triangular prism 13, so that the structure of the polarization splitting prism 10 can be more beautiful and concise, and is easy to fit in near-to-eye display systems. It should be noted that, in practical applications, the shapes of the bottom triangles of the three triangular prisms can be set according to actual needs, and the limitations in this embodiment are not required herein. Particularly, the third triangular prism may be an arbitrary triangular shape with respect to its bottom surface type since it does not affect the actual optical path.

In a second aspect, the present invention further provides a near-eye display system, including the polarization splitting prism as described in any one of the above first aspects. The polarization beam splitter prism is applied to a near-to-eye display system and can fold a light path, the light machine center and the lens center of the AR glasses do not need to be on the same horizontal line through folding the light path, the complexity of the near-to-eye display system is reduced, and the size and the mass of the near-to-eye display system can be further reduced.

In some embodiments, referring to fig. 2 and 5 in combination, or referring to fig. 4 and 8 in combination, near-eye display system 100 further includes an illumination unit 20, a display unit 30, and an optical waveguide 40; the illumination unit 20 is disposed on a first incident surface of the polarization splitting prism 10, and the illumination unit 20 is configured to provide an illumination light source for the display unit 30; the display unit 30 is disposed on the second incident surface 120 of the polarization splitting prism 10, and the display unit 30 is used for providing image information; the optical waveguide 40 is provided on the exit surface 130 of the polarization beam splitter prism 10.

Specifically, the display unit 30 is an LCOS, a DMD, or other reflective display chip; the central light of the display unit 30 should be on the straight line where the reflected light of the central light of the illumination unit 20 reflected by the first bonding surface is located, the central light generated by the illumination unit 20 should be incident perpendicularly to the first incident surface, the central light generated by the display unit 30 should be incident perpendicularly to the second incident surface, at this time, please refer to fig. 2 and 6 in combination, or refer to fig. 4 and 9 in combination, after the S-polarized light generated by the illumination unit 20 reaches the first bonding surface through the first incident surface 110, the S-polarized light is reflected to the second incident surface 120, and exits perpendicularly to the second incident surface 120 to reach the display unit 30, after the display unit 30 is illuminated, the image light including the display information is projected, because of the characteristics of the display unit 30 and the relative position of the display unit 30 and the polarization beam splitter 10, the image light projected by the display unit 30 is P-polarized light relative to the polarization beam splitter 10, at this time, after reaching the first bonding surface through the second incident surface 120, the P-polarized light is transmitted to the reflecting surface 102, then reflected by the reflecting surface 102, and is emitted to the optical waveguide 40 perpendicular to the emitting surface 130, and is totally reflected in the optical waveguide 40, and finally enters the human eye. It should be noted that the area of the light spot generated by the illumination unit should be slightly larger than the operable area of the display unit, and meanwhile, referring to fig. 6, an included angle α 1 between the central light generated by the illumination unit 20 and the perpendicular line on the bottom side of the first triangular prism 11 should be equal to an included angle α 2 between the central light generated by the display unit 30 and the perpendicular line on the bottom side of the first triangular prism 11, so that it can be ensured that the image information on the display unit is completely illuminated and presented to the human eye.

It can be seen that, through the polarization beam splitter prism and the design of the light path, the center of the illumination unit, the center of the display unit and the center of the optical waveguide do not need to be on the same horizontal plane, so, please refer to fig. 7, when designing AR glasses, the center of the optical machine 2 and the center of the lens 3 can be designed on different horizontal planes, which not only can still ensure that the picture output by the optical machine 2 is located at the center of the lens 3, but also can make the glasses legs 1 move up through the way because the glasses legs 1 of the AR glasses are usually combined with the optical machine 2, so that the whole structure of the AR glasses is more inclined to the structure of the common glasses, which is more light and beautiful and improves the experience of users.

In particular, the optical waveguide 40 may be a geometric array optical waveguide or a grating optical waveguide. In some embodiments, the optical waveguide 40 is a geometric array optical waveguide, and includes an entrance prism, where the entrance prism is disposed in the light outgoing direction of the reflection surface of the polarization splitting prism 10, at this time, the P-polarized light emitted from the polarization splitting prism 10 can be coupled into the geometric array optical waveguide through the entrance prism, and finally reflected to the human eye through a selective transmission reflection film inside the optical waveguide. Alternatively, in some embodiments, the optical waveguide 40 is a grating optical waveguide, which includes an incoupling grating and an outcoupling grating, the incoupling grating is disposed in the light outgoing direction of the reflection surface of the polarization splitting prism 10, and can couple P-polarized light into the optical waveguide 40, and finally can be outcoupled to human eyes in the working area of the outcoupling grating through the expansion and outcoupling of the outcoupling grating. Further, the grating optical waveguide may further include a turning grating for turning light to the coupling grating to improve light utilization.

When the illumination unit 20 cannot directly output S-polarized light, in some embodiments, referring to fig. 4 and 10, the near-eye display system 100 further includes a polarizer 60, and the polarizer 60 is disposed between the illumination unit 20 and the first incident surface 110 of the polarization splitting prism 10. The polarizer 60 is oriented to S-polarized light, and is capable of filtering stray light emitted from the illumination unit 20 and converting the stray light emitted from the illumination unit 20 into S-polarized light.

In order to further shape the light of the near-eye display system 100, in some embodiments, referring to fig. 4 and 14 in combination, the near-eye display system 100 further includes at least one imaging lens 70, the imaging lens 70 is disposed between the display unit 30 and the second incident surface 120 of the polarization splitting prism 10, and/or the imaging lens 70 is disposed between the exit surface 130 of the polarization splitting prism 10 and the light guide 40. By designing the imaging lens 70 with curvature, the image light can be shaped. Specifically, the material of the imaging lens 70 may be a glass material, a quartz material, a resin material, a liquid material, or any other suitable lens material, and meanwhile, the type of the imaging lens 70 may be a spherical lens, an aspherical lens, a cemented lens, a free-form surface, or any other suitable lens type. In practical applications, the number and the position of the imaging lenses 70 can be set according to practical needs, and are not limited herein.

In some embodiments, referring again to fig. 4 and 10, the illumination unit 20 includes an LED light source 21 and at least one illumination lens 22; the LED light source 21, the at least one illuminating lens 22, the polarizer 60, and the first incident surface 110 of the polarization splitting prism 10 are sequentially disposed along the first optical axis. The LED light source 21 is configured to generate LED illumination light, and the illumination lens 22 is configured to diffuse the illumination light generated by the LED light source 21, which is beneficial to improving uniformity of illumination. In practical applications, the LED light source 21 may be a three-color integrated light source, a four-color integrated light source, or any other suitable illumination light source, and the illumination lens 22 may be a conventional lens, a cemented lens, a fresnel lens, or any other suitable lens, which is not limited herein.

Further, in order to further improve the uniformity of the illumination, in some embodiments, please continue to refer to fig. 10, the illumination unit 20 further includes a microlens array 23, and the microlens array 23 is disposed between the illumination lens 22 and the polarizer 60 along the first optical axis. Specifically, the microlens array 23 may be a fly-eye lens, or a cylindrical array lens. In practical applications, the diffuser may also be a reflective cup, a light guide, a diffusion sheet, or any other suitable diffuser, which is not limited herein.

The operation of the near-eye display system 100 according to the present invention will be described in detail with reference to specific embodiments.

The first embodiment is as follows:

referring to fig. 4 and fig. 10 in combination, the near-eye display system 100 in the present embodiment includes an LED light source 21, a first illumination lens 221, a second illumination lens 222, a fly-eye lens 23, a polarizer 60, a polarization splitting prism 10, a display unit 30, a first imaging lens 71, a second imaging lens 72, a third imaging lens 73, and an optical waveguide 40; the LED light source 21, the first illumination lens 221, the second illumination lens 222, the fly eye lens 23, the polarizer 60, and the first incident surface 110 of the polarization splitting prism 10 are sequentially disposed along a first optical axis, the display unit 30 and the second incident surface 120 of the polarization splitting prism 10 are sequentially disposed along a second optical axis, and the exit surface 130 of the polarization splitting prism 10, the first imaging lens 71, the second imaging lens 72, the third imaging lens 73, and the optical waveguide 40 are sequentially disposed along a third optical axis. The first illumination lens 221 is a spherical lens, and the second illumination lens 222 is an aspherical lens. The first, second and third triangular prisms in the polarization splitting prism 10 are isosceles right-angle prisms, and it should be noted that the third triangular prism may be omitted.

At this time, referring to fig. 4 and fig. 11 in combination, the illumination light generated by the LED light source 21 is shaped into uniform light spots after passing through the first illumination lens 221, the second illumination lens 222, and the micro lens array 23, and the light beam becomes S-polarized light after passing through the polarizer 60, and then the S-polarized light is reflected after reaching the first bonding surface 101 perpendicular to the first polarization splitting prism 10, and is emitted to the display unit 30 perpendicular to the second bonding surface 120, because of the characteristics of the spatial light modulator and the relative position between the display unit 30 and the polarization splitting prism 10, the image light reflected by the display unit 30 is P-polarized light relative to the first bonding surface of the polarization splitting prism 10, and the P-polarized light is incident to the first bonding surface 101 through the second bonding surface 120 and is transmitted to the reflection surface 102, and then the image light is reflected by the reflection surface 102 and is emitted perpendicularly to the emission surface 130, then, the light is shaped by the first imaging lens 71, the second imaging lens 72, and the third imaging lens 73 and then enters the optical waveguide 40 as parallel light.

Referring to fig. 11 and 12, when the optical waveguide 40 is a geometric array optical waveguide, the shaped parallel light will continue to propagate forward in the optical waveguide 40 according to the catadioptric theorem, and finally be reflected out of the inside of the optical waveguide and enter the glasses of the user to realize the augmented reality display, where it should be noted that the viewing angle of fig. 12 is the vertical downward viewing angle of fig. 10. Referring to fig. 13, when the optical waveguide 40 is a diffractive waveguide, which includes a diffractive coupling-in area 41 and a diffractive coupling-out area 42, the shaped parallel light enters the diffractive waveguide through the diffractive coupling-in area 41 of the diffractive waveguide, continues to propagate forward therein according to the diffractive optical principle, and finally exits through the diffractive coupling-out area 42 and enters the glasses of the user, so as to implement augmented reality display.

Example two:

referring to fig. 4 and fig. 14 in combination, the near-eye display system 100 in the present embodiment includes an LED light source 21, a first illumination lens 221, a second illumination lens 222, a polarizer 60, a polarization beam splitter 10, a display unit 30, a first cemented lens 74, a second cemented lens 75, and an optical waveguide 40; the LED light source 21, the first illumination lens 221, the second illumination lens 222, the polarizer 60, and the first incident surface 110 of the polarization splitting prism 10 are sequentially disposed along a first optical axis, the display unit 30, the first cemented lens, and the second incident surface 120 of the polarization splitting prism 10 are sequentially disposed along a second optical axis, and the exit surface 130 of the polarization splitting prism 10, the second cemented lens, and the light guide 40 are sequentially disposed along a third optical axis. The first illumination lens 221 and the second illumination lens 222 are both spherical lenses, and the first cemented lens 74 and the second cemented lens 75 are used for shaping image light. The first, second and third triangular prisms in the polarization splitting prism 10 are isosceles right-angle prisms, and it should be noted that the third triangular prism may be omitted. The optical path of the near-eye display system 100 can be specifically described in the first embodiment, and is not described herein again.

In the present embodiment, since the illumination light is reflected by the first cemented surface of the polarization beam splitter 10 and reaches the display unit 30 through the first cemented lens 74, and the image light projected by the display unit 30 after receiving the illumination light also passes through the first cemented lens 74 and reaches the second incident surface 120 of the polarization beam splitter 10, it can be seen that the first cemented lens 74 not only can further homogenize the illumination light and improve the diffusion angle of the light, but also can shape the image light. It is known that, in the near-eye display system 100, the light uniformizing system for diffusing the illumination light and the shaping system for shaping the image light can share the optical device by design, so that the utilization rate of the optical device can be improved, and the overall size can be reduced.

To sum up, in the first aspect, the polarization beam splitter prism provided by the present invention can provide a longer folding light path, which is beneficial to reducing the volume of the whole device, and the positions of the optical machine center horizontal plane and the lens center horizontal plane can be pulled open by the polarization beam splitter prism subsequently when designing the AR glasses, so that the optical machine center and the lens center of the AR glasses are not on the same horizontal plane; in the second aspect, multiple possible designs are provided for the whole light path arrangement of the near-eye display system through the polarization beam splitter prism, the design freedom degree of the near-eye display system is improved, and great convenience is provided for the subsequent design of the whole device structure; in the third aspect, since the polarization beam splitter prism folds the light path, the utilization rate of the optical device can be improved, the overall volume, quality and cost can be reduced, and the polarization beam splitter prism is more beneficial to actual production and application by further designing the curvatures and positions of the illumination lens and the imaging lens.

The utility model provides a polarization beam splitter prism and a near-to-eye display system, the polarization beam splitter prism comprises a first triangular prism and a second triangular prism, and is provided with a first incident surface, a second incident surface and an emergent surface, the first gluing surface is a polarization beam splitting surface, the third side surface adjacent to the apex angle of the second triangular prism is a reflecting surface, the polarization beam splitter prism can reflect the light in the first polarization state incident from the first incident surface to the second incident surface through the polarization beam splitting surface and transmit the light in the second polarization state incident from the second incident surface to the reflecting surface, meanwhile, the light in the second polarization state is reflected to the emergent surface through the reflecting surface to be emergent, the light path is folded, when the polarization beam splitter prism is applied to a near-to-eye display system, the optical machine center and the lens center of the AR glasses do not need to be on the same horizontal plane, the system complexity is reduced, and the volume and the mass of the device are reduced.

It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A polarization splitting prism, comprising: a first triangular prism and a second triangular prism;

the first triangular prism and the second triangular prism are both isosceles triangular prisms;

the polarization splitting prism is provided with a first incident surface, a second incident surface and an emergent surface, the first incident surface is a first side surface adjacent to the apex angle of the first triangular prism, the second incident surface is a second side surface adjacent to the apex angle of the first triangular prism, and the emergent surface is a first side surface opposite to the apex angle of the second triangular prism;

a third side surface opposite to the vertex angle of the first triangular prism is attached to a second side surface adjacent to the vertex angle of the second triangular prism to form a first adhesive surface, the first adhesive surface is a polarization beam splitting surface, and the third side surface adjacent to the vertex angle of the second triangular prism is a reflecting surface;

the first bonding surface is used for reflecting the light in the first polarization state incident from the first incident surface to the second incident surface for emergence, and is used for transmitting the light in the second polarization state incident from the second incident surface to the reflecting surface;

the reflecting surface is used for reflecting the light in the second polarization state to the emergent surface for emergence.

2. The polarization splitting prism of claim 1, further comprising a third triangular prism;

the first side face of the third triangular prism is attached to a third side face adjacent to the vertex angle of the second triangular prism to form a second adhesive face;

the second bonding surface is the reflecting surface.

3. The polarization splitting prism of claim 1 or 2, wherein the first triangular prism and the second triangular prism are isosceles right angle prisms.

4. A near-eye display system comprising the polarizing beam splitter prism of any one of claims 1 to 3.

5. The near-eye display system of claim 4 further comprising an illumination unit, a display unit, and a light guide;

the illumination unit is arranged on a first incident surface of the polarization beam splitter prism and used for providing a light source for the display unit;

the display unit is arranged on a second incidence surface of the polarization splitting prism and used for providing image information;

the optical waveguide is arranged on the emergent surface of the polarization splitting prism.

6. A near-eye display system as claimed in claim 5 further comprising at least one imaging lens disposed between the display unit and the second entrance face and/or between the exit face and the light guide, the imaging lens being configured to shape light.

7. A near-eye display system as claimed in claim 5 or 6 further comprising a polarizer disposed between the illumination unit and the first entrance face.

8. The near-eye display system of claim 7 wherein the illumination unit comprises an LED light source and at least one illumination lens; the LED light source, the at least one illuminating lens, the polarizing plate and the first incident surface are sequentially arranged along a first optical axis.

9. The near-eye display system of claim 8 wherein the illumination unit further comprises a microlens array disposed between the illumination lens and the polarizer along the first optical axis.

10. A near-eye display system according to claim 5 or 6 wherein the optical waveguide is a geometric array optical waveguide or a diffractive optical waveguide.

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