CN115903226A

CN115903226A - Augmented reality display system

Info

Publication number: CN115903226A
Application number: CN202110992765.8A
Authority: CN
Inventors: 舒新炜; 董若
Original assignee: Jitong Technology Beijing Co ltd
Current assignee: Jitong Technology Beijing Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2023-04-04

Abstract

The embodiment of the invention discloses an augmented reality display system, which comprises: the display device comprises a first prism, a second prism, a first display unit and a second display unit; the first display unit and the second display unit are respectively used for emitting a first imaging light beam and a second imaging light beam; the first imaging light beam sequentially passes through the first prism, the bonding surface and the second prism and then is transmitted on the bonding surface to form a first emergent light beam; the second imaging light beam sequentially passes through the second prism, the bonding surface and the first prism and then is reflected on the bonding surface to form a second emergent light beam; the ambient light is transmitted through the second prism and the first prism in sequence to form a third emergent light beam; the first emergent light beam and the second emergent light beam enter eyes of a user to form a virtual image, the third emergent light beam enters the eyes of the user to form a real image, and the first emergent light beam, the second emergent light beam and the third emergent light beam are overlapped to realize the display of an augmented reality image at the eyes of the user, effectively reduce the volume of a system and improve the user experience.

Description

Augmented reality display system

Technical Field

The embodiment of the invention relates to the technical field of optics, in particular to an augmented reality display system.

Background

Augmented Reality (AR) technology is a technology for increasing the perception of a user to the real world by using a projection system to generate virtual images and information superposition of the real world, and is an Augmented Reality display technology which integrates various scientific technologies such as a computer graphics technology, a computer simulation technology, a sensor technology, a display technology and the like. The AR technology can be widely applied to various fields such as military, medical treatment, construction, education, engineering, film and television, entertainment and the like.

However, in the existing enhanced display system, 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, and the overall device is heavy, thereby reducing the user experience. On the premise of ensuring a large viewing angle, in order to improve user experience, miniaturization and light weight are problems that need to be solved urgently by the AR display device.

Disclosure of Invention

The embodiment of the invention provides an augmented reality display system, which is used for reducing the volume of the system and improving the use experience of a user.

An embodiment of the present invention provides an augmented reality display system, including: the display device comprises a first prism, a second prism, a first display unit and a second display unit;

the first prism comprises at least a first optical surface, a second optical surface and a third optical surface;

the second prism comprises at least a fourth optical surface, a fifth optical surface and a sixth optical surface;

the second optical surface and the fourth optical surface form a bonding surface;

the third optical surface is parallel to the fifth optical surface;

the first display unit is used for emitting a first imaging light beam, and the first optical surface is positioned on a propagation path of the first imaging light beam;

the second display unit is used for emitting a second imaging light beam, and the sixth optical surface is positioned on the propagation path of the second imaging light beam;

the first imaging light beam sequentially passes through the first prism, the bonding surface and the second prism and then is transmitted on the bonding surface to form a first emergent light beam;

the second imaging light beam sequentially passes through the second prism, the bonding surface and the first prism and then is reflected on the bonding surface to form a second emergent light beam;

ambient light is transmitted through the second prism and the first prism in sequence to form a third emergent light beam;

the first emergent light beam and the second emergent light beam enter eyes of a user to form a virtual image, and the third emergent light beam enters eyes of the user to form a real image.

Optionally, the first imaging light beam is incident to the first prism through the first optical surface, is transmitted to the fifth optical surface through the adhesive surface after being totally reflected by the third optical surface, is incident to the sixth optical surface after being totally reflected by the fifth optical surface, is incident to the fifth optical surface after being reflected by the sixth optical surface, is reflected to the fifth optical surface through the adhesive surface after being totally reflected by the fifth optical surface, is transmitted to the third optical surface through the adhesive surface after being reflected by the fifth optical surface, and is transmitted through the third optical surface to form the first emergent light beam to enter the user's eye.

The second imaging light beam is incident to the second prism through the sixth optical surface, is transmitted to the third optical surface through the bonding surface after being totally reflected by the fifth optical surface, is incident to the first optical surface after being totally reflected by the third optical surface, is incident to the third optical surface after being reflected by the first optical surface, is reflected to the third optical surface through the bonding surface after being totally reflected by the third optical surface, and is transmitted through the third optical surface to form a second emergent light beam which enters eyes of a user.

Optionally, the first prism further includes a seventh optical surface, the seventh optical surface is adjacent to the first optical surface and the second optical surface respectively, and the seventh optical surface is parallel to the third optical surface;

the first imaging light beam is incident to the first prism through the first optical surface, is incident to the third optical surface after being totally reflected by the seventh optical surface, is incident to the fifth optical surface through the bonding surface after being totally reflected by the third optical surface, is incident to the sixth optical surface after being totally reflected by the fifth optical surface, is incident to the fifth optical surface after being totally reflected by the sixth optical surface, is reflected to the fifth optical surface through the bonding surface after being totally reflected by the fifth optical surface, is transmitted to the third optical surface through the bonding surface after being reflected by the fifth optical surface, and is transmitted through the third optical surface to form the first emergent light beam which enters the eyes of the user.

The second imaging light beam is incident to the second prism through the sixth optical surface, is transmitted to the third optical surface through the bonding surface after being totally reflected by the fifth optical surface, is incident to the seventh optical surface after being totally reflected by the third optical surface, is incident to the first optical surface after being totally reflected by the seventh optical surface, is incident to the seventh optical surface after being reflected by the first optical surface, is incident to the third optical surface after being totally reflected by the seventh optical surface, is reflected to the third optical surface through the bonding surface after being totally reflected by the third optical surface, and is transmitted by the third optical surface to form the second emergent light beam which enters eyes of users.

Optionally, the second prism further includes an eighth optical surface, the eighth optical surface is respectively adjacent to the fourth optical surface and the sixth optical surface, and the eighth optical surface is parallel to the fifth optical surface;

the first imaging light beam is incident to the first prism through the first optical surface, is transmitted to the fifth optical surface through the bonding surface after being totally reflected by the third optical surface, is incident to the eighth optical surface after being totally reflected by the fifth optical surface, is incident to the sixth optical surface after being totally reflected by the eighth optical surface, is incident to the eighth optical surface after being totally reflected by the sixth optical surface, is incident to the fifth optical surface after being totally reflected by the eighth optical surface, is reflected to the fifth optical surface through the bonding surface after being totally reflected by the fifth optical surface, is transmitted to the third optical surface through the bonding surface after being reflected by the fifth optical surface, and is transmitted through the third optical surface to form the first emergent light beam to enter the eyes of the user.

The second imaging light beam is incident to the second prism through the sixth optical surface, is incident to the fifth optical surface after being totally reflected by the eighth optical surface, is incident to the third optical surface through the bonding surface after being totally reflected by the fifth optical surface, is incident to the first optical surface after being totally reflected by the third optical surface, is incident to the third optical surface after being reflected by the first optical surface, is reflected to the third optical surface through the bonding surface after being totally reflected by the third optical surface, and is transmitted through the third optical surface to form a second emergent light beam which enters the eyes of the user.

Optionally, the first prism further includes a ninth optical surface, the second prism further includes a tenth optical surface, the ninth optical surface is respectively adjacent to the first optical surface and the second optical surface, the tenth optical surface is respectively adjacent to the fourth optical surface and the sixth optical surface, the ninth optical surface and the third optical surface are parallel, and the tenth optical surface is parallel to the fifth optical surface;

the first imaging light beam is incident to the first prism through the first optical surface, is incident to the third optical surface after being totally reflected by the ninth optical surface, is incident to the fifth optical surface through the bonding surface after being totally reflected by the third optical surface, is incident to the tenth optical surface after being totally reflected by the tenth optical surface, is incident to the sixth optical surface after being totally reflected by the sixth optical surface, is incident to the tenth optical surface after being totally reflected by the tenth optical surface, is incident to the fifth optical surface after being totally reflected by the fifth optical surface, is reflected to the fifth optical surface through the bonding surface after being reflected by the fifth optical surface, is transmitted to the third optical surface through the bonding surface after being reflected by the fifth optical surface, and is transmitted by the third optical surface to form the first emergent light beam to enter the user eyes.

The second imaging light beam is incident to the second prism through the sixth optical surface, is incident to the fifth optical surface after being totally reflected by the tenth optical surface, is transmitted to the third optical surface through the bonding surface after being totally reflected by the fifth optical surface, is incident to the ninth optical surface after being totally reflected by the ninth optical surface, is incident to the first optical surface after being totally reflected by the first optical surface, is incident to the ninth optical surface after being totally reflected by the ninth optical surface, is incident to the third optical surface after being totally reflected by the third optical surface, is reflected to the third optical surface through the bonding surface after being totally reflected by the third optical surface, and is transmitted by the third optical surface to form the second emergent light beam which enters the user eyes.

Optionally, the first optical surface includes an aspheric surface, and the first optical surface is convex toward the first display unit side;

the second, third, fourth, and fifth optical surfaces each comprise a plane;

the sixth optical surface includes a spherical surface, an aspherical surface, or a plane surface.

Optionally, a first optical film is disposed on a surface of the first optical surface, and the first optical film is configured to transmit the first imaging light beam and reflect the second imaging light beam;

the sixth optical surface is provided with a second optical film for transmitting the second imaging light beam and reflecting the first imaging light beam.

Optionally, the second optical surface and/or the fourth optical surface is provided with a third optical film;

the third optical film is for transmitting the first imaging light beam incident from the first prism side, reflecting the first imaging light beam incident from the second prism side, and transmitting the first imaging light beam incident from the second prism side, and for transmitting the second imaging light beam incident from the second prism side and reflecting the second imaging light beam incident from the first prism side;

the fifth optical surface is provided with a fourth optical film; the fourth optical film is used for reflecting the first imaging light beam or the second imaging light beam.

Optionally, the thickness of the first prism is 2 to 12mm, and the thickness of the second prism is 2 to 12mm; the length of the third optical surface is 10-25 mm; the length of the fifth optical surface is 8-25 mm.

Optionally, each of the first display unit and the second display unit includes at least one of a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a micro light emitting diode display, a reflective display, a diffractive light source, a projector, a light beam generator, a laser, and a light modulator.

The invention provides an augmented reality display system, comprising: the display device comprises a first prism, a second prism, a first display unit and a second display unit; the first prism at least comprises a first optical surface, a second optical surface and a third optical surface; the second prism at least comprises a fourth optical surface, a fifth optical surface and a sixth optical surface; the second optical surface and the fourth optical surface form a bonding surface; the third optical surface is parallel to the fifth optical surface; the first display unit is used for emitting a first imaging light beam, and the first optical surface is positioned on a propagation path of the first imaging light beam; the second display unit is used for emitting a second imaging light beam, and the sixth optical surface is positioned on the propagation path of the second imaging light beam; the first imaging light beam sequentially passes through the first prism, the bonding surface and the second prism and then is transmitted on the bonding surface to form a first emergent light beam; the second imaging light beam sequentially passes through the second prism, the bonding surface and the first prism and then is reflected on the bonding surface to form a second emergent light beam; the ambient light is transmitted through the second prism and the first prism in sequence to form a third emergent light beam; the first outgoing beam and the second outgoing beam enter eyes of a user to form a virtual image, the third outgoing beam enters the eyes of the user to form a real object image, the imaging beams emitted by the first display unit and the second display unit are subjected to light path adjustment through the first prism and the second prism to form a first outgoing beam and a second outgoing beam, and ambient light is subjected to light path adjustment through the first prism and the second prism to form a third outgoing beam, the first outgoing beam, the second outgoing beam and the third outgoing beam are superposed at the eyes of the user to display an image, the overall size of the system is effectively reduced, and the use experience of the user is improved.

Drawings

While the drawings used in the description of the embodiments or prior art will be described briefly to more clearly illustrate the embodiments or prior art, it is obvious that the drawings in the description will be some specific embodiments of the present invention, and it will be obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention can be extended and extended to other structures and drawings without doubt being within the scope of the claims of the present invention.

Fig. 1 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view illustrating an augmented reality display system according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view illustrating another augmented reality display system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another augmented reality display system according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view illustrating an augmented reality display system according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view illustrating another augmented reality display system according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional diagram of another augmented reality display system according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional diagram illustrating an augmented reality display system according to an embodiment of the present invention;

fig. 10 is a schematic cross-sectional view of another augmented reality display system according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention;

fig. 12 is a schematic cross-sectional view illustrating an augmented reality display system according to an embodiment of the present invention;

fig. 13 is a schematic cross-sectional view illustrating another augmented reality display system according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a polarization splitting film according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.

Fig. 1 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional diagram of an augmented reality display system according to an embodiment of the present invention, and fig. 3 is a schematic cross-sectional diagram of another augmented reality display system according to an embodiment of the present invention, as shown in fig. 1, fig. 2, and fig. 3, the augmented reality display system includes: a first prism 10, a second prism 20, a first display unit 11 and a second display unit 12; the first prism 10 comprises at least a first optical surface 1, a second optical surface 2 and a third optical surface 3; the second prism 20 comprises at least a fourth optical surface 4, a fifth optical surface 5 and a sixth optical surface 6; the second optical surface 2 and the fourth optical surface 4 form a bonding surface; the third optical surface 3 is parallel to the fifth optical surface 5; the first display unit 11 is used for emitting a first imaging light beam, and the first optical surface 1 is positioned on a propagation path of the first imaging light beam; the second display unit 12 is used for emitting a second imaging light beam, and the sixth optical surface is positioned on the propagation path of the second imaging light beam; the first imaging light beam sequentially passes through the first prism 10, the bonding surface and the second prism 20 and then is transmitted on the bonding surface to form a first emergent light beam; the second imaging light beam sequentially passes through the second prism, the bonding surface and the first prism 10 and then is reflected on the bonding surface to form a second emergent light beam; the ambient light is transmitted through the second prism 20 and the first prism 10 in sequence to form a third outgoing light beam; the first outgoing light beam and the second outgoing light beam enter the eyes of the user to form a virtual image, and the third outgoing light beam enters the eyes of the user to form a real object image.

The first prism 10 and the second prism 20 may be made of the same optical material such as optical glass or optical resin, and the first prism 10 and the second prism 20 may be made of optical resin material, so as to ensure light weight and low manufacturing cost of the augmented reality display system, and enable mass production. As shown in fig. 1-3, exemplary first prism 10 includes a first optical surface 1, a second optical surface 2, and a third optical surface 3; the second prism 20 comprises a fourth optical surface 4, a fifth optical surface 5 and a sixth optical surface 6, the first optical surface 1 and the sixth optical surface 6 are both aspheric surfaces, and the first optical surface 1 is convex towards the first display unit 11 side; the second optical surface 2, the third optical surface 3, the fourth optical surface 4 and the fifth optical surface 5 are all planes; the surfaces of the first optical surface 1, the second optical surface 2, the fifth optical surface 5 and the sixth optical surface 6 are all provided with a semi-transparent semi-reflective light-splitting film for illustration, the second optical surface 2 and the fourth optical surface 4 form a bonding surface, the bonding surface can reduce the volume of the augmented reality display device and reduce the propagation path of the imaging light beam, and meanwhile, the second optical surface 2 is provided with the semi-transparent semi-reflective light-splitting film, so that the imaging light beam can be partially reflected and partially transmitted, and effective light beam screening is further realized; the third optical surface 3 is parallel to the fifth optical surface 5, that is, the included angle between the first optical surface 1 and the second optical surface 2 is the same as the included angle between the fourth optical surface and the fifth optical surface, the included angle between the first optical surface 1 and the second optical surface 2 and the included angle between the fourth optical surface and the fifth optical surface are 20 to 35 degrees, because the first optical surface 1 is a convex aspheric surface, the included angle between the tangent line along the vertex of the first optical surface 1 and the second optical surface 2 is equal to the included angle between the fifth optical surface 5 and the sixth optical surface 6, the included angle between the tangent line along the vertex of the first optical surface 1 and the second optical surface 2 and the included angle between the fifth optical surface 5 and the sixth optical surface 6 are 24 to 105 degrees, the included angle relationship between the optical surfaces is reasonably set, and the propagation path of the imaging light beam is ensured. The first display unit 11 and the second display unit 12 are both configured to emit imaging light beams, so that the imaging light beams are subjected to propagation direction adjustment and effective light beam screening through the first prism 10 and the second prism 20, and finally a first outgoing light beam and a second outgoing light beam are formed and are incident to eyes of a user to form a virtual image, where the imaging light beams emitted by the first display unit 11 and the second display unit 12 may be the same or different, and a specific situation may be selected accordingly according to an actual design requirement, which is not specifically limited in the embodiment of the present invention. The arrangement of the first display unit 11 and the second display unit 12 can enhance the depth of field of the display device, and enhance the visual experience effect. The ambient light (as shown by the dotted line in the figure) may be natural light, and sequentially passes through the second prism 20 and the first prism 10 to form a third emergent light beam, and enters the user's eyes to form a real object image, and the three light beams of the first emergent light beam, the second emergent light beam and the third emergent light beam are superposed to realize that the user's eyes display an augmented reality display image with multiple depths of field.

The embodiment of the invention arranges a first prism at least comprising a first optical surface, a second optical surface and a third optical surface, a second prism at least comprising a fourth optical surface, a fifth optical surface and a sixth optical surface, a first display unit for emitting a first imaging light beam and a second display unit for emitting a second imaging light beam in an augmented reality display system. The second optical surface and the fourth optical surface form a bonding surface; the third optical surface is parallel to the fifth optical surface. The first imaging light beam and the second imaging light beam respectively pass through the first prism, the bonding surface and the second prism and then are transmitted on the bonding surface to form a first emergent light beam and a second emergent light beam; ambient light is transmitted through the second prism and the first prism to form a third emergent light beam; the first emergent light beam and the second emergent light beam enter the eyes of the user to form a virtual image, and the third emergent light beam enters the eyes of the user to form a real image, so that superposition can be performed, the depth of field effect of imaging is improved, the visual experience of the user is ensured, and the miniaturization and the light weight of the augmented reality display system can be realized.

With continued reference to fig. 2 and fig. 3, optionally, the first imaging light beam enters the first prism 10 through the first optical surface 1, is transmitted to the fifth optical surface 5 through the adhesive surface after being totally reflected by the third optical surface 3, enters the sixth optical surface 6 after being totally reflected by the fifth optical surface 5, enters the fifth optical surface 5 after being reflected by the sixth optical surface 6, is reflected to the fifth optical surface 5 through the adhesive surface after being totally reflected by the fifth optical surface 5, is transmitted to the third optical surface 3 through the adhesive surface after being reflected by the fifth optical surface 5, and is transmitted through the third optical surface 3 to form a first emergent light beam to enter the user's eye;

the second imaging light beam is incident to the second prism 20 through the sixth optical surface 6, is totally reflected by the fifth optical surface 5, is transmitted to the third optical surface 3 through the bonding surface, is totally reflected by the third optical surface 3, is incident to the first optical surface 1, is reflected by the first optical surface 1, is incident to the third optical surface 3, is totally reflected by the third optical surface 3, is reflected to the third optical surface 3 through the bonding surface, is transmitted through the third optical surface 3, and forms a second emergent light beam which enters the eyes of the user.

As shown in fig. 2, the first display unit 11 emits a first imaging beam, because the first optical surface 1 is provided with a semi-transparent and semi-reflective light-splitting film, the first imaging beam can be transmitted through the first optical surface 1 to enter the first prism 10, the first imaging beam satisfies a total reflection condition at the third optical surface, and passes through the adhesive surface after being totally reflected, because the adhesive surface is provided with the semi-transparent and semi-reflective light-splitting film, part of the light is transmitted, part of the light is reflected, the first imaging beam is transmitted to the fifth optical surface 5, the first imaging beam satisfies a total reflection condition at the fifth optical surface 5, and is incident to the sixth optical surface 6 after being totally reflected, because the sixth optical surface 6 is provided with the semi-transparent and semi-reflective light-splitting film, the first imaging beam is reflected at the sixth optical surface and then is incident to the fifth optical surface 5, the first imaging light beam meets the total reflection condition on the fifth optical surface 5, passes through the adhesive surface after being totally reflected, partial light is transmitted and reflected due to the fact that the semi-transparent and semi-reflective light splitting film is arranged on the adhesive surface, the first imaging light beam is reflected to the fifth optical surface 5, the first imaging light beam passes through the adhesive surface after being reflected on the fifth optical surface 5, partial light is transmitted and reflected due to the fact that the semi-transparent and semi-reflective light splitting film is arranged on the adhesive surface, the first imaging light beam is transmitted to the third optical surface 3, the first imaging light beam does not meet the total reflection condition on the third optical surface 3, the first imaging light beam is transmitted through the third optical surface 3, and a first emergent light beam is formed and enters eyes of a user to form a virtual image.

As shown in fig. 3, the second display unit 12 emits the second imaging beam, because the sixth optical surface 6 is provided with a half-transmitting half-reflecting light-splitting film, the second imaging beam enters the second prism 20 through the sixth optical surface 6, the second imaging beam meets the total reflection condition at the fifth optical surface 5, and after total reflection, the second imaging beam passes through the adhesive surface, because the adhesive surface is provided with the half-transmitting half-reflecting light-splitting film, part of the light is transmitted, and part of the light is reflected, the second imaging beam transmits to the third optical surface 3, the second imaging beam meets the total reflection condition at the third optical surface 3, and after total reflection, the second imaging beam enters the first optical surface 1, because the first optical surface 1 is provided with the half-transmitting half-reflecting light-splitting film, part of the light is transmitted, part of the light is reflected, and part of the light is reflected, the second imaging beam enters the third optical surface 3, after total reflection, the second imaging beam enters the eye through the adhesive surface, because the adhesive surface is provided with the half-transmitting half-reflecting film, part of the light is transmitted, and part of the light is reflected, and the second imaging beam enters the eye, and the eye virtual light beam enters the eye, and the eye image is formed.

Fig. 4 is a schematic structural diagram of another augmented reality display system provided in an embodiment of the present invention, fig. 5 is a schematic cross-sectional diagram of an augmented reality display system provided in an embodiment of the present invention, fig. 6 is a schematic cross-sectional diagram of another augmented reality display system provided in an embodiment of the present invention, as shown in fig. 5 and fig. 6, optionally, the first prism 10 further includes a seventh optical surface 7, the seventh optical surface 7 is respectively adjacent to the first optical surface 1 and the second optical surface 2, and the seventh optical surface 7 is parallel to the third optical surface 3;

the first imaging light beam is incident to a first prism 10 through a first optical surface 1, is incident to a third optical surface 3 after being totally reflected by a seventh optical surface 7, is incident to a fifth optical surface 5 through a bonding surface after being totally reflected by the third optical surface 3, is incident to a sixth optical surface 6 after being totally reflected by the fifth optical surface 5, is incident to the fifth optical surface 5 after being reflected by the sixth optical surface 6, is reflected to the fifth optical surface 5 through the bonding surface after being totally reflected by the fifth optical surface 5, is transmitted to the third optical surface 3 through the bonding surface after being reflected by the fifth optical surface 5, and is transmitted through the third optical surface 3 to form a first emergent light beam to enter eyes of a user;

the second imaging light beam is incident to the second prism 20 through the sixth optical surface 6, is transmitted to the third optical surface 3 through the adhesive surface after being totally reflected by the fifth optical surface 5, is incident to the seventh optical surface 7 after being totally reflected by the third optical surface 3, is incident to the first optical surface 1 after being totally reflected by the seventh optical surface 7, is incident to the seventh optical surface 7 after being reflected by the first optical surface 1, is incident to the third optical surface 3 after being totally reflected by the seventh optical surface 7, is reflected to the third optical surface 3 through the adhesive surface after being totally reflected by the third optical surface 3, and is transmitted through the third optical surface 3 to form a second emergent light beam which enters the eyes of the user.

As shown in fig. 5 and 6, the first prism 10 includes a first optical surface 1, a second optical surface 2, a third optical surface 3, and a seventh optical surface 7; the second prism 20 includes a fourth optical surface 4, a fifth optical surface 5, and a sixth optical surface 6, the first optical surface 1 and the sixth optical surface 6 are aspheric surfaces, and the first optical surface 1 is convex toward the first display unit 11 side; the second optical surface 2, the third optical surface 3, the fourth optical surface 4, the fifth optical surface 5 and the seventh optical surface 7 are all planes; a description will be given of an example in which the surfaces of the first optical surface 1, the second optical surface 2, the fifth optical surface 5, and the sixth optical surface 5 are provided with half-transmissive and half-reflective light-splitting films.

Referring to fig. 5, the first display unit 11 emits the first imaging beam, because the first optical surface 1 is provided with the half-transmitting and half-reflecting light-splitting film, the first imaging beam enters the first prism through the first optical surface 1, the first imaging beam meets the total reflection condition at the seventh optical surface 7, after being totally reflected, the first imaging beam enters the third optical surface 3, the first imaging beam meets the total reflection condition at the third optical surface 3, after being totally reflected, the first imaging beam enters the sixth optical surface 6, after being reflected at the sixth optical surface 6, the first imaging beam enters the sixth optical surface 6 through the glue surface, because the glue surface is provided with the half-transmitting and half-reflecting light-splitting film, part of the light is transmitted, part of the light is reflected, the first imaging beam transmits the fifth optical surface 5, the first imaging beam meets the total reflection condition at the fifth optical surface 5, after being totally reflected, the sixth optical surface 6 is provided with the half-transmitting and half-reflecting light-splitting film, partial light is transmitted, partial light is reflected, the first imaging light beam is reflected on the sixth optical surface 6 and then enters the fifth optical surface 5, the first imaging light beam meets the total reflection condition on the fifth optical surface 5 and passes through the bonding surface after the total reflection, the bonding surface is provided with a semi-transparent and semi-reflective light splitting film, partial light is transmitted, partial light is reflected, the first imaging light beam is reflected on the fifth optical surface 5 and passes through the bonding surface after the reflection, the bonding surface is provided with the semi-transparent and semi-reflective light splitting film, partial light is transmitted, partial light is reflected, the first imaging light beam is transmitted to the third optical surface 3, the first imaging light beam does not meet the total reflection condition on the third optical surface 3, the first imaging light beam is transmitted through the third optical surface 3, forming a first emergent light beam to enter the eyes of the user to form a virtual image.

Referring to fig. 6, the second display unit 12 emits the second imaging beam, because the sixth optical surface 6 is provided with a semi-transparent and semi-reflective light splitting film, the second imaging beam is incident to the second prism 20 through the sixth optical surface 6, the second imaging beam meets the total reflection condition at the fifth optical surface 5, and passes through the adhesive surface after being totally reflected, because the adhesive surface is provided with the semi-transparent and semi-reflective light splitting film, part of the light is transmitted, and part of the light is reflected, the second imaging beam is transmitted to the third optical surface 3, the second imaging beam meets the total reflection condition at the third optical surface 3, and is incident to the seventh optical surface 7 after being totally reflected, because the first optical surface 1 is provided with the semi-transparent and semi-reflective light splitting film, part of the light is transmitted, part of the light is reflected, the second imaging beam is incident to the seventh optical surface 7 after being reflected at the first optical surface 1, the second imaging beam meets the total reflection condition at the seventh optical surface 7, and is incident to the third optical surface 3, and forms a virtual reflected light beam after being reflected at the first optical surface, and enters the third imaging beam, and forms a virtual reflected light image, and passes through the adhesive surface 3, and the second imaging beam, and the third imaging beam enters the eye after being totally reflected, and passes through the adhesive surface, and the virtual total reflection condition is provided with the virtual total reflection condition.

Further, on the basis of the embodiment of fig. 6, fig. 7 is a schematic cross-sectional schematic diagram of another augmented reality display system according to an embodiment of the present invention, the first optical surface 1 of the first prism 10 may be extended, in order to ensure the integrity of the first prism 10 in the augmented reality system, additional optical surfaces are introduced to be respectively adjacent to the first optical surface 1 and the third optical surface 3, and the additional optical surface located between the first optical surface 1 and the third optical surface 3 does not have any optical effect and does not affect the propagation path of the imaging light beam, so that by extending the first optical surface 1, the receiving range of the second imaging light beam on the first optical surface 1 is increased, and further, the field angle of the augmented reality display system and the moving range of the user's eyes are increased.

It should be noted that the second prism 20 may further be provided with an auxiliary optical surface parallel to the fifth optical surface 5, and the auxiliary optical surface is respectively adjacent to the fourth optical surface 4 and the sixth optical surface 6, but propagation paths of the first imaging light beam and the second imaging light beam in the first prism and the second prism are the same as those in the processes described in fig. 4 and fig. 5, and are not described again.

Fig. 8 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention, fig. 9 is a schematic cross-sectional diagram of an augmented reality display system according to an embodiment of the present invention, fig. 10 is a schematic cross-sectional diagram of another augmented reality display system according to an embodiment of the present invention, as shown in fig. 9 and fig. 10, optionally, the second prism further includes an eighth optical surface 8, the eighth optical surface 8 is respectively adjacent to the fourth optical surface 4 and the sixth optical surface 6, and the eighth optical surface 8 is parallel to the fifth optical surface 5;

the first imaging light beam is incident to a first prism 10 through a first optical surface 1, is transmitted to a fifth optical surface 5 through a bonding surface after being totally reflected by a third optical surface 3, is incident to an eighth optical surface 8 after being totally reflected by the fifth optical surface 5, is incident to a sixth optical surface 6 after being totally reflected by an eighth optical surface 8, is incident to an eighth optical surface 8 after being totally reflected by the sixth optical surface 6, is incident to the fifth optical surface 5 after being totally reflected by the eighth optical surface 8, is reflected to the fifth optical surface 5 through the bonding surface after being totally reflected by the fifth optical surface 5, is transmitted to the third optical surface 3 through the bonding surface after being reflected by the fifth optical surface 5, and is transmitted by the third optical surface 3 to form a first emergent light beam to enter eyes of a user;

the second imaging light beam is incident to the second prism 20 through the sixth optical surface 6, is incident to the fifth optical surface 5 after being totally reflected by the eighth optical surface 8, is transmitted to the third optical surface 3 through the bonding surface after being totally reflected by the fifth optical surface 5, is incident to the first optical surface 1 after being totally reflected by the third optical surface 3, is incident to the third optical surface 3 after being reflected by the first optical surface 1, is reflected to the third optical surface 3 through the bonding surface after being totally reflected by the third optical surface 3, and is transmitted through the third optical surface 3 to form a second emergent light beam which enters the eyes of the user.

As shown in fig. 9 and 10, the first prism 10 includes a first optical surface 1, a second optical surface 2, and a third optical surface 3; the second prism 20 includes a fourth optical surface 4, a fifth optical surface 5, a sixth optical surface 6, and an eighth optical surface 8, the first optical surface 1 and the sixth optical surface 6 are aspheric surfaces, and the first optical surface 1 is convex toward the first display unit 11 side; the second optical surface 2, the third optical surface 3, the fourth optical surface 4, the fifth optical surface 5 and the eighth optical surface 8 are all planes; the surface of the first optical surface 1, the surface of the second optical surface 2, the surface of the fifth optical surface 5, and the surface of the sixth optical surface 6 are all provided with a half-mirror film as an example.

With reference to fig. 9, the first display unit 11 emits the first imaging beam, because the first optical surface 1 is provided with the semi-transparent and semi-reflective light-splitting film, the first imaging beam enters the first prism 10 through the first optical surface 1, the first imaging beam satisfies the total reflection condition at the third optical surface 3, and passes through the bonding surface after being totally reflected, because the bonding surface is provided with the semi-transparent and semi-reflective light-splitting film, part of the light is transmitted, and part of the light is reflected, the first imaging beam is transmitted to the fifth optical surface 5, the first imaging beam satisfies the total reflection condition at the fifth optical surface 5, and enters the eighth optical surface 8 after being totally reflected, and the first imaging beam satisfies the total reflection condition at the eighth optical surface 8, and enters the sixth optical surface 6 after being totally reflected, because the sixth optical surface 6 is provided with the semi-transparent and semi-reflective light-splitting film, part of the light is transmitted, and part of the light is reflected, the first imaging light beam is reflected on the sixth optical surface 6 and then enters the eighth optical surface 8, the first imaging light beam meets the total reflection condition on the eighth optical surface 8 and then enters the fifth optical surface 5 after being totally reflected, the first imaging light beam meets the total reflection condition on the fifth optical surface 5 and then passes through the bonding surface after being totally reflected, because the bonding surface is provided with the semi-transparent and semi-reflective light splitting film, part of light is transmitted, part of light is reflected, the first imaging light beam is reflected to the fifth optical surface 5, because the fifth optical surface 5 is provided with the semi-transparent and semi-reflective light splitting film, part of light is transmitted, part of light is reflected, the first imaging light beam is transmitted to the third optical surface 3, the first imaging light beam does not meet the total reflection condition on the third optical surface 3, the first imaging beam is transmitted through the third optical surface 3 to form a first emergent beam entering the eyes of the user to form a virtual image.

Referring to fig. 10, the second display unit 12 emits the second imaging beam, because the sixth optical surface 6 is provided with the semi-transparent and semi-reflective optical splitting film, the second imaging beam is incident to the second prism 20 through the sixth optical surface 6, the second imaging beam meets the total reflection condition at the eighth optical surface 8, the second imaging beam is incident to the fifth optical surface 5 after being totally reflected, the second imaging beam meets the total reflection condition at the fifth optical surface 5 and passes through the bonding surface after being totally reflected, because the bonding surface is provided with the semi-transparent and semi-reflective optical splitting film, part of the light is transmitted, part of the light is reflected, the second imaging beam is transmitted to the third optical surface 3, the second imaging beam meets the total reflection condition at the third optical surface 3 and is incident to the first optical surface 1 after being totally reflected, because the first optical surface 1 is provided with the semi-transparent and semi-reflective optical splitting film, part of the light is transmitted, part of the light is reflected, the second imaging beam is incident to the third optical surface 3 after being reflected by the first optical surface 1, the second imaging beam meets the total reflection condition at the third optical surface 3, the second imaging beam passes through the bonding surface, the second optical splitting film, the second imaging beam is transmitted, the second imaging beam enters the third optical surface, the second imaging beam, the third imaging beam forms a virtual reflected, and the eye, the eye-transparent and the eye reflection image is reflected, the second imaging beam, the eye.

Fig. 11 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention, fig. 12 is a schematic cross-sectional diagram of an augmented reality display system according to an embodiment of the present invention, and fig. 13 is a schematic cross-sectional diagram of another augmented reality display system according to an embodiment of the present invention, as shown in fig. 12 and fig. 13, optionally, the first prism 10 further includes a ninth optical surface 9, the second prism further includes a tenth optical surface 10, the ninth optical surface 9 is respectively adjacent to the first optical surface 1 and the second optical surface 2, the tenth optical surface 10 is respectively adjacent to the fourth optical surface 4 and the sixth optical surface 6, the ninth optical surface 9 and the third optical surface 3 are parallel, and the tenth optical surface 10 is parallel to the fifth optical surface 5;

the first imaging light beam is incident to a first prism 10 through a first optical surface 1, is incident to a third optical surface 3 after being totally reflected by a ninth optical surface 9, is incident to a fifth optical surface 5 through a bonding surface after being totally reflected by the third optical surface 3, is incident to a tenth optical surface 10 after being totally reflected by the fifth optical surface 5, is incident to a sixth optical surface 6 after being totally reflected by the tenth optical surface 10, is incident to the tenth optical surface 10 after being totally reflected by the sixth optical surface 6, is incident to the fifth optical surface 5 after being totally reflected by the tenth optical surface 10, is reflected to the fifth optical surface 5 through the bonding surface after being totally reflected by the fifth optical surface 5, is transmitted to the third optical surface 3 through the bonding surface after being reflected by the fifth optical surface 5, and is transmitted to form a first emergent light beam to enter the eyes of users through the third optical surface 3.

The second imaging light beam is incident to the second prism 20 through the sixth optical surface 6, is incident to the fifth optical surface 5 after being totally reflected by the tenth optical surface 10, is incident to the fifth optical surface 5 after being totally reflected by the fifth optical surface 5, is transmitted to the third optical surface 3 through the bonding surface, is incident to the ninth optical surface 9 after being totally reflected by the third optical surface 3, is incident to the first optical surface 1 after being totally reflected by the ninth optical surface 9, is incident to the ninth optical surface 9 after being totally reflected by the first optical surface 1, is incident to the third optical surface 3 after being totally reflected by the ninth optical surface 9, is reflected to the third optical surface 3 through the bonding surface after being totally reflected by the third optical surface 3, and is transmitted by the third optical surface 3 to form a second emergent light beam to enter the eyes of the user.

As shown in fig. 12 and 13, the exemplary first prism 10 includes a first optical surface 1, a second optical surface 2, a third optical surface 3, and a seventh optical surface 7; the second prism comprises a fourth optical surface 4, a fifth optical surface 5, a sixth optical surface 6 and an eighth optical surface 8, the first optical surface 1 and the sixth optical surface 6 are aspheric surfaces, and the first optical surface 1 is convex towards the first display unit 11 side; the second optical surface 2, the third optical surface 3, the fourth optical surface 4, the fifth optical surface 5, the seventh optical surface 7 and the eighth optical surface 8 are all planes; a description will be given of an example in which the surfaces of the first optical surface 1, the second optical surface 2, the fifth optical surface 5, and the sixth optical surface 6 are provided with half-transmissive and half-reflective light-splitting films.

Referring to fig. 12, the first display unit 11 emits the first imaging beam, because the first optical surface 1 is provided with the half-transmitting and half-reflecting light-splitting film, the first imaging beam enters the first prism 10 through the first optical surface 1, the first imaging beam meets the total reflection condition at the ninth optical surface 9, after being totally reflected, the first imaging beam enters the third optical surface 13, the first imaging beam meets the total reflection condition at the third optical surface 13, after being totally reflected, the first imaging beam passes through the bonding surface, because the bonding surface is provided with the half-transmitting and half-reflecting light-splitting film, part of the light is transmitted, part of the light is reflected, the first imaging beam is transmitted to the fifth optical surface 5, the first imaging beam meets the total reflection condition at the fifth optical surface 5, after being totally reflected, the first imaging beam enters the tenth optical surface 10, after being totally reflected, the first imaging beam enters the sixth optical surface 6, because the sixth optical surface 6 is provided with the semi-transparent and semi-reflective light-splitting film, part of light rays are transmitted, part of light rays are reflected, the first imaging light beam is reflected on the sixth optical surface 6 and then is incident to the tenth optical surface 10, the first imaging light beam meets the total reflection condition on the tenth optical surface 10 and then is incident to the fifth optical surface 5 after being totally reflected, the first imaging light beam meets the total reflection condition on the fifth optical surface 5 and then passes through the bonding surface after being totally reflected, because the bonding surface is provided with the semi-transparent and semi-reflective light-splitting film, part of light rays are transmitted, part of light rays are reflected, the first imaging light beam is reflected to the fifth optical surface 5, because the bonding surface is provided with the semi-transparent and semi-reflective light-splitting film, part of light rays are transmitted, and part of light rays are reflected, the first imaging light beam is transmitted to the third optical surface, the first imaging light beam does not meet the total reflection condition at the third optical surface 3, the first imaging light beam is transmitted through the third optical surface 3, a first emergent light beam is formed and enters the eyes of the user, and a virtual image is formed.

Referring to fig. 13, the second display unit 12 emits the second imaging beam, because the sixth optical surface 6 is provided with the half-transmitting and half-reflecting light-splitting film, the second imaging beam enters the second prism 20 through the sixth optical surface 6, the second imaging beam meets the total reflection condition at the tenth optical surface 10, after total reflection, the second imaging beam enters the fifth optical surface 5, after total reflection, the second imaging beam meets the total reflection condition at the fifth optical surface 5, after total reflection, the second imaging beam passes through the bonding surface, because the bonding surface is provided with the half-transmitting and half-reflecting light-splitting film, part of the light is transmitted, part of the light is reflected, the second imaging beam is transmitted to the third optical surface 3, the second imaging beam meets the total reflection condition at the third optical surface 3, after total reflection, the second imaging beam enters the ninth optical surface 9, and the second imaging beam meets the total reflection condition at the ninth optical surface 9, the second imaging light beam is reflected to the third optical surface 3, does not meet the total reflection condition at the third optical surface 3, and is transmitted through the third optical surface 3 to form a second emergent light beam which enters the eyes of a user to form a virtual image.

Alternatively, the first optical surface 1 includes an aspherical surface, and the first optical surface 1 is convex toward the first display unit 11 side;

the second optical surface 2, the third optical surface 3, the fourth optical surface 4 and the fifth optical surface 5 each comprise a plane;

the sixth optical surface 6 includes a spherical surface, an aspherical surface, or a flat surface.

The first optical surface 1 may be an aspheric surface, the first optical surface 1 protrudes toward one side of the first display unit 11, and the best fitting radius of the first optical surface is 40-80 mm, so that it can be ensured that the imaging light beam is reflected and then enters the first optical surface 1. The second optical surface 2, the third optical surface 3, the fourth optical surface 4, and the fifth optical surface 5 may include a plane, and meanwhile, the seventh surface 7, the eighth optical surface 8, the ninth optical surface 9, and the tenth optical surface 10 may also include a plane for realizing total reflection of the imaging light beam, so as to regulate and control a propagation angle of the imaging light beam. The sixth optical surface 6 may include a spherical surface, an aspheric surface, or a plane, so as to realize reflection or total reflection of the imaging light beam on the sixth optical surface 6, and the surface type of the sixth optical surface may be selected according to actual design requirements, which is not specifically limited in the embodiment of the present invention.

Optionally, a first optical film is disposed on the surface of the first optical surface 1, and the first optical film is configured to transmit the first imaging light beam and reflect the second imaging light beam;

the sixth optical surface 6 is provided with a second optical film for transmitting the second imaging light beam and reflecting the first imaging light beam.

The first optical film is disposed on the surface of the first optical surface 1, and may also be a half-transmitting and half-reflecting film or a specific wavelength reflecting film, and the first optical film is used for transmitting the first imaging light beam and reflecting the second imaging light beam. The second optical film is disposed on the surface of the second optical surface 2, and the second optical film may also be a semi-transmissive and semi-reflective optical film or a specific wavelength reflective optical film, and is configured to transmit the second imaging light beam and reflect the first imaging light beam. When the first imaging light beam emitted by the first display unit 11 is the same as the second imaging light beam emitted by the second display unit 12, in order to ensure the display effect of the picture finally entering human eyes, the first optical film and the second optical film may be transflective films; when the first imaging light beam emitted from the first display unit 11 is different from the second imaging light beam emitted from the second display unit 12, in order to ensure the display effect of the picture finally entering human eyes, the first optical film and the second optical film may be specific wavelength reflective films. The type of the first optical film and the second optical film may be selected according to actual design requirements, and embodiments of the present invention are not particularly limited.

Optionally, a third optical film is disposed on the surface of the second optical surface 2 and/or the fourth optical surface 4;

the third optical film 3 is for transmitting the first imaging light beam incident from the first prism 10 side, and reflecting the first imaging light beam incident from the second prism 20 side and transmitting the first imaging light beam incident from the second prism 20 side, and also for transmitting the second imaging light beam incident from the second prism 20 side and reflecting the second imaging light beam incident from the first prism 10 side;

the fifth optical surface 5 is provided with a fourth optical film; the fourth optical film is used for reflecting the first imaging light beam or the second imaging light beam.

In order to ensure that the imaging beam is selected by the bonding surface, the third optical film 3 may be a common spectroscopic film, such as a semi-transmissive and semi-reflective spectroscopic film, the reflectance of the spectroscopic film in a wavelength range of 450 to 650nm is between 30 to 70, and the examples of the semi-transmissive and semi-reflective spectroscopic film plated in the prism in fig. 2, fig. 3, fig. 5, fig. 6, fig. 9, fig. 10, fig. 12 and fig. 13 are described above, or the third optical film is a polarization spectroscopic film, and the polarization spectroscopic film transmits and reflects the P light in a wavelength range of 450 to 650nm or transmits and reflects the P light. Fig. 14 is a schematic structural view of a polarization splitting film according to an embodiment of the present invention, as shown in fig. 14, when the second optical surface 2 or the fourth optical surface 4 is provided with the polarization splitting film 32, correspondingly, in order to ensure that the polarization state of the imaging light beam is adjusted, a first quarter-wave plate 31 and a second quarter-wave plate 33 are respectively disposed on two sides of the polarization splitting film 32, which is exemplified by the propagation path of the second imaging light beam in fig. 10, and the polarization splitting film for transmitting the P light and reflecting the S light is disposed on the second optical surface, when the polarization state of the second imaging light beam emitted from the second display unit 12 is natural light, because the sixth optical surface 6 is provided with the semi-transparent and semi-reflective light splitting film, the second imaging light beam is incident to the second prism 20 through the sixth optical surface 6, the second imaging light beam meets the total reflection condition at the eighth optical surface 8, the second imaging light beam is incident to the fifth optical surface 5 after the total reflection, the second imaging light beam meets the total reflection condition at the fifth optical surface 5, the second imaging light beam passes through the bonding surface after the total reflection, because the bonding surface is provided with the polarization beam splitting film 32 for transmitting the P light and reflecting the S light, the first quarter-wave plate 31 and the second quarter-wave plate 33, the second imaging light beam passes through the first quarter-wave plate 31, the polarization state is not changed, the second imaging light beam passes through the polarization beam splitting film 32, because the polarization splitting film 32 has the property that the P light is transmitted and reflected by the S light, the polarization state of the second imaging light beam emitted by the polarization splitting film 32 is the P light, and after the second imaging light beam enters the second quarter-wave plate 33, due to the phase retardation of the second quarter-wave plate 33, the polarization state of the second imaging light beam exiting from the second quarter-wave plate 33 is elliptically polarized light, and enters the first prism 10.

When the polarization state of the second imaging light beam emitted by the second display unit 12 is the elliptically polarized light, the second imaging light beam enters the second prism 2 through the sixth optical surface 6 because the sixth optical surface 6 is provided with the semi-transparent half-wave-splitting film, the second imaging light beam meets the total reflection condition at the eighth optical surface 8, the second imaging light beam after total reflection enters the fifth optical surface 5, the second imaging light beam meets the total reflection condition at the fifth optical surface 5 and passes through the bonding surface after total reflection, because the bonding surface is provided with the polarization light-splitting film 32 for transmitting the S light by the P light, the first quarter-wave plate 31 and the second quarter-wave plate 33, the second imaging light beam passes through the first quarter-wave plate 31, because of the phase delay effect of the first quarter-wave plate 31, the polarization of the second imaging light beam is changed into the P light, the second imaging light beam passes through the polarization light-splitting film 32, because the property of the polarization light-splitting film 32 is the P light transmission S light reflection, the polarization light beam of the second imaging light beam emitted by the polarization film is the P light, the second imaging light beam enters the second quarter-wave plate 33, and the second imaging light beam enters the second quarter-wave plate 33 and the second polarization film 33, the second imaging light beam enters the second quarter-polarized light beam after passing through the second quarter-polarized light plate 33, the second quarter-polarized light wave plate 33, the second quarter-polarized light beam 10.

When the polarization state of the second imaging light beam emitted by the second display unit 12 is P light, the sixth optical surface 6 is provided with a semi-transparent and semi-reflective light-splitting film, the second imaging light beam is incident to the second prism 20 through the sixth optical surface 6, the second imaging light beam meets the total reflection condition at the eighth optical surface 8, the second imaging light beam after total reflection is incident to the fifth optical surface 5, the second imaging light beam meets the total reflection condition at the fifth optical surface 5, and passes through a bonding surface after total reflection, the bonding surface is provided with a polarization light-splitting film 32 for transmitting S light to reflect by P light, a first quarter-wave plate 31 and a second quarter-wave plate 33, the second imaging light beam passes through the first quarter-wave plate 31, the polarization state of the second imaging light beam is changed to be elliptical polarized light, the second imaging light beam passes through the polarization light-splitting film 32, the polarization light-splitting film 32 has the property of transmitting S light to reflect by P light, the polarization state of the second imaging light beam emitted by the polarization film 32 is P light, the second imaging light beam enters the second imaging light-splitting film 33, and the second imaging light beam enters the second quarter-polarized light-wave plate 33, and the second imaging light beam 10 passes through the second quarter-wave plate 33.

The second imaging light beam in elliptical polarization state is transmitted to the third optical surface 3 through the cementing layer, the second imaging light beam meets the total reflection condition at the third optical surface 3, and is incident to the first optical surface 1 after being totally reflected, because the first optical surface 1 is provided with the semi-transparent semi-reflecting light splitting film, partial light is transmitted, partial light is reflected, the second imaging light beam is incident to the third optical surface 3 after being reflected at the first optical surface 1, the second imaging light beam meets the total reflection condition at the third optical surface 3, and is subjected to the cementing surface after being totally reflected, because the cementing surface is provided with the P light transmission S light reflection polarization splitting film 32, the first quarter wave plate 31 and the second quarter wave plate 33, the second imaging light beam is subjected to the second quarter wave plate 33, because of the phase delay effect of the second quarter wave plate 33, the polarization state of the second imaging light beam emitted from the second quarter-wave plate 33 is changed to be S light, the second imaging light beam passes through the polarization splitting film 32, the polarization splitting film 32 transmits the P light and reflects the S light, the second imaging light beam is reflected by the polarization splitting film 32, after the second imaging light beam enters the second quarter-wave plate 33 again, due to the phase delay effect of the second quarter-wave plate 33, the polarization state of the second imaging light beam reflected by the second quarter-wave plate 33 is elliptically polarized light and enters the first prism 20, the second imaging light beam is reflected to the third optical surface 3, the second imaging light beam does not satisfy the total reflection condition at the third optical surface 3, the second imaging light beam is transmitted by the third optical surface 3, and a second emergent light beam is formed and enters the user eye to form a virtual image. For the augmented reality display systems of fig. 2, 4, 8, and 11, a polarization splitting film may also be disposed on the second optical surface and/or the fourth optical surface, and the specific process of changing the polarization state of the imaging light beam is the same as the principle of the propagation process of the imaging light beam described in fig. 10, and will not be described in detail again.

The third optical film may be disposed on the second optical surface 2, and the fourth optical surface 4 may not be disposed; the fourth optical surface 4 is provided with a third optical film, and the second optical surface 2 is not provided with the third optical film; the second optical surface 2 and the fourth optical surface 4 are both provided with third optical films, so as to reduce the manufacturing cost of the augmented reality display system, the third optical films can be arranged on the single surfaces of the second optical surface or the fourth optical surface, the specific arrangement mode can be selected correspondingly according to the actual design requirement, and the embodiment of the invention is not limited specifically. The fifth optical film may also be a semi-transmissive and semi-reflective light splitting film or a specific wavelength reflective film, and the specific setting mode may be selected accordingly according to actual design requirements, which is not specifically limited in the embodiment of the present invention.

Optionally, the thickness of the first prism 10 is 2 to 12mm, and the thickness of the second prism 20 is 2 to 12mm; the length of the third optical surface 3 is 10-25 mm; the length of the fifth optical surface 5 is 8 to 25mm.

Because the third optical surface 3 of the first prism 10 is parallel to the fifth optical surface of the second prism 20, and the second optical surface 2 of the first prism 10 is glued with the fourth optical surface 4 of the second prism 20, the thicknesses of the first prism 10 and the second prism 20 can be ensured to be the same, compared with the prior art, the thicknesses of the first prism 10 and the second prism 20 can be 2-12 mm, and the length of the third optical surface 3 is 10-25 mm; the length of the fifth optical surface 5 is 8-25 mm, and the thickness of the prism and the length of the optical surface are reasonably designed, so that the small volume of the augmented reality display system can be ensured.

Optionally, each of the first display unit 11 and the second display unit 12 includes at least one of a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a micro light emitting diode display, a reflective display, a diffractive light source, a projector, a light beam generator, a laser, and a light modulator.

The sizes of the first display unit 11 and the second display unit 12 are between 0.1 inch and 1 inch, so that the first imaging light beam emitted from the first display unit 11 can enter the first prism and the second imaging light beam emitted from the second display unit 12 can enter the first prism 10, and the first display unit 11 and the second display unit 12 are used as light emitting elements, including various types such as a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a micro light emitting diode display, a reflective display, a diffractive light source, a projector, a light beam generator, a laser, and an optical modulator, which can be selected accordingly according to actual design requirements.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An augmented reality display system, comprising: the display device comprises a first prism, a second prism, a first display unit and a second display unit;

the third optical surface is parallel to the fifth optical surface;

2. The system of claim 1, wherein the first image beam enters the first prism through the first optical surface, is totally reflected by the third optical surface, is transmitted to the fifth optical surface through the bonding surface, is totally reflected by the fifth optical surface, enters the sixth optical surface, is reflected by the sixth optical surface, enters the fifth optical surface, is totally reflected by the fifth optical surface, is reflected by the bonding surface, is transmitted to the third optical surface through the bonding surface, and is transmitted by the third optical surface to form the first exit beam to enter the user's eye;

3. The augmented reality display system of claim 1, wherein the first prism further comprises a seventh optical surface, the seventh optical surface being contiguous with the first optical surface and the second optical surface, respectively, and the seventh optical surface being parallel to the third optical surface;

the first imaging light beam is incident to the first prism through the first optical surface, is incident to the third optical surface after being totally reflected by the seventh optical surface, is transmitted to the fifth optical surface through the bonding surface after being totally reflected by the third optical surface, is incident to the sixth optical surface after being totally reflected by the sixth optical surface, is incident to the fifth optical surface after being totally reflected by the fifth optical surface, is reflected to the fifth optical surface through the bonding surface after being totally reflected by the fifth optical surface, is transmitted to the third optical surface through the bonding surface after being reflected by the fifth optical surface, and is transmitted through the third optical surface to form the first emergent light beam to enter eyes of a user;

4. The augmented reality display system of claim 1, wherein the second prism further comprises an eighth optical surface, the eighth optical surface being contiguous with the fourth optical surface and the sixth optical surface, respectively, and the eighth optical surface being parallel to the fifth optical surface;

the first imaging light beam is incident to the first prism through the first optical surface, is transmitted to the fifth optical surface through the bonding surface after being totally reflected by the third optical surface, is incident to the eighth optical surface after being totally reflected by the fifth optical surface, is incident to the sixth optical surface after being totally reflected by the eighth optical surface, is incident to the eighth optical surface after being totally reflected by the sixth optical surface, is incident to the fifth optical surface after being totally reflected by the eighth optical surface, is reflected to the fifth optical surface through the bonding surface after being totally reflected by the fifth optical surface, is transmitted to the third optical surface through the bonding surface after being reflected by the fifth optical surface, and is transmitted through the third optical surface to form the first emergent light beam to enter eyes of a user;

5. The augmented reality display system of claim 1, wherein the first prism further comprises a ninth optical surface, the second prism further comprises a tenth optical surface, the ninth optical surface is contiguous with the first optical surface and the second optical surface, respectively, the tenth optical surface is contiguous with the fourth optical surface and the sixth optical surface, respectively, and the ninth optical surface and the third optical surface are parallel, the tenth optical surface is parallel to the fifth optical surface;

the first imaging light beam is incident to the first prism through the first optical surface, is incident to the third optical surface after being totally reflected by the ninth optical surface, is incident to the fifth optical surface through the bonding surface after being totally reflected by the third optical surface, is incident to the tenth optical surface after being totally reflected by the tenth optical surface, is incident to the sixth optical surface after being totally reflected by the sixth optical surface, is incident to the tenth optical surface after being totally reflected by the tenth optical surface, is incident to the fifth optical surface after being totally reflected by the fifth optical surface, is reflected to the fifth optical surface through the bonding surface after being reflected by the fifth optical surface, is transmitted to the third optical surface through the bonding surface after being reflected by the fifth optical surface, and is transmitted by the third optical surface to form the first emergent light beam to enter the user eye;

6. The augmented reality display system of claim 1, wherein the first optical surface comprises an aspheric surface, the first optical surface being convex toward a side of the first display unit;

the second, third, fourth, and fifth optical surfaces each comprise a plane;

7. The augmented reality display system of claim 1, wherein the first optical surface is provided with a first optical film for transmitting the first imaging beam and reflecting the second imaging beam;

8. Augmented reality display system according to claim 1, wherein the second optical face and/or the fourth optical face is provided with a third optical film;

9. The augmented reality display system of claim 1, wherein the first prism has a thickness of 2 to 12mm and the second prism has a thickness of 2 to 12mm; the length of the third optical surface is 10-25 mm; the length of the fifth optical surface is 8-25 mm.

10. The augmented reality display system of claim 1, wherein the first display unit and the second display unit each comprise at least one of a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a micro light emitting diode display, a reflective display, a diffractive light source, a projector, a light beam generator, a laser, and a light modulator.