CN115903226A - Augmented reality display system - Google Patents

Abstract

The embodiment of the present invention discloses an augmented reality display system, which includes: 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 to emit first The imaging beam and the second imaging beam; the first imaging beam passes through the first prism, the glued surface and the second prism in turn, and then transmits on the glued surface to form the first outgoing beam; the second imaging beam passes through the second prism, the glued surface and the second prism in sequence After the first prism, it is reflected on the glued surface to form the second outgoing beam; the ambient light is sequentially transmitted through the second prism and the first prism to form the third outgoing beam; the first outgoing beam and the second outgoing beam enter the user's eyes to form a virtual image, and the second outgoing beam enters the user's eyes to form a virtual image. The three outgoing beams enter the user's eyes to form a physical image, and the first outgoing beam, the second outgoing beam and the third outgoing beam are superimposed to realize the augmented reality image display at the user's eyes, and effectively reduce the system volume and improve user experience.

Description

An augmented reality display system

technical field

Embodiments of the present invention relate to the field of optical technologies, and in particular to an augmented reality display system.

Background technique

Augmented reality (Augmented Reality, "AR") technology is a technology that uses a projection system to generate virtual images and superimpose real-world information to increase users' perception of the real world. Augmented reality display technology combines computer graphics technology and computer simulation technology. , sensor technology, display technology and other scientific technologies, it creates a virtual information environment on the multi-dimensional information space, which can make users feel immersive, have perfect interaction ability with the environment, and help to inspire idea. AR technology can be widely used in military, medical, construction, education, engineering, film and television, entertainment and many other fields.

However, in the existing enhanced display system, the number of optical elements used is large, and the system is relatively complicated, so it is difficult to reduce the volume of the device, and the overall device is heavy, resulting in a decrease in user experience. On the premise of ensuring a large viewing angle, in order to improve user experience, miniaturization and light weight are urgent problems to be solved for AR display devices.

Contents of the invention

An embodiment of the present invention provides an augmented reality display system, so as to reduce the volume of the system and improve user experience.

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

The first prism includes at least a first optical surface, a second optical surface and a third optical surface;

The second prism includes at least a fourth optical surface, a fifth optical surface and a sixth optical surface;

The second optical surface forms a glued surface with the fourth optical surface;

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

The first display unit is configured to emit a first imaging light beam, and the first optical surface is located on a propagation path of the first imaging light beam;

The second display unit is used to emit a second imaging light beam, and the sixth optical surface is located on the propagation path of the second imaging light beam;

The first imaging beam passes through the first prism, the glued surface and the second prism in sequence, and then transmits on the glued surface to form a first outgoing beam;

The second imaging beam sequentially passes through the second prism, the glued surface and the first prism, and then reflects on the glued surface to form a second outgoing beam;

Ambient light sequentially passes through the second prism and the first prism to form a third outgoing light beam;

The first outgoing light beam and the second outgoing light beam enter the user's eyes to form a virtual image, and the third outgoing light beam enters the user's eye to form a physical image.

Optionally, the first imaging light beam enters the first prism through the first optical surface, is totally reflected by the third optical surface, and then transmits to the fifth optical surface through the glued surface, and passes through The fifth optical surface is incident to the sixth optical surface after being totally reflected, incident to the fifth optical surface after being reflected by the sixth optical surface, and then glued together after being totally reflected by the fifth optical surface. Surface reflection to the fifth optical surface, reflected by the fifth optical surface, transmitted to the third optical surface through the glued surface, transmitted through the third optical surface, forming the first outgoing light beam entering user eyes.

The second imaging light beam enters the second prism through the sixth optical surface, is totally reflected by the fifth optical surface, and then transmits to the third optical surface through the glued surface, and passes through the third optical surface. Incident to the first optical surface after being totally reflected by the optical surface, incident to the third optical surface after being reflected by the first optical surface, reflected to the said glued surface after being totally reflected by the third optical surface The third optical surface is transmitted through the third optical surface to form the second outgoing light beam to enter the user's eyes.

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

The first imaging light beam is incident on the first prism through the first optical surface, is incident on the third optical surface after being totally reflected by the seventh optical surface, and is totally reflected by the third optical surface transmitted through the glued surface to the fifth optical surface, incident to the sixth optical surface after being totally reflected by the fifth optical surface, and incident to the fifth optical surface after being reflected by the sixth optical surface , after being totally reflected by the fifth optical surface, reflected to the fifth optical surface by the glued surface, reflected by the fifth optical surface, transmitted to the third optical surface by the glued surface, and passed through the glued surface The third optical surface is transmitted to form the first outgoing light beam to enter the user's eyes.

The second imaging light beam enters the second prism through the sixth optical surface, is totally reflected by the fifth optical surface, and then transmits to the third optical surface through the glued surface, and passes through the third optical surface. Incident to the seventh optical surface after total reflection of the optical surface, incident to the first optical surface after total reflection of the seventh optical surface, incident to the seventh optical surface after reflection of the first optical surface , incident to the third optical surface after being totally reflected by the seventh optical surface, reflected to the third optical surface by the glued surface after being totally reflected by the third optical surface, passing through the third optical surface surface transmission, forming the second outgoing light beam to enter the user's eyes.

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 adjacent to the first optical surface. Five optical planes are parallel;

The first imaging light beam enters the first prism through the first optical surface, is totally reflected by the third optical surface, and then transmits to the fifth optical surface through the glued surface, and passes through the fifth optical surface. Incident to the eighth optical surface after being totally reflected by the optical surface, incident to the sixth optical surface after being totally reflected by the eighth optical surface, incident to the eighth optical surface after being reflected by the sixth optical surface , incident to the fifth optical surface after being totally reflected by the eighth optical surface, reflected by the glued surface to the fifth optical surface after being totally reflected by the fifth optical surface, passing through the fifth optical surface After being reflected by the surface, it is transmitted to the third optical surface through the glued surface, and transmitted through the third optical surface to form the first outgoing light beam to enter the user's eyes.

The second imaging light beam is incident on the second prism through the sixth optical surface, is incident on the fifth optical surface after being totally reflected by the eighth optical surface, and is totally reflected by the fifth optical surface transmitted through the glued surface to the third optical surface, incident to the first optical surface after being totally reflected by the third optical surface, and incident to the third optical surface after being reflected by the first optical surface After being totally reflected by the third optical surface, it is reflected to the third optical surface by the glued surface, and transmitted by the third optical surface, forming the second outgoing light beam to enter the eyes of the user.

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

The first imaging light beam is incident on the first prism through the first optical surface, is incident on the third optical surface after being totally reflected by the ninth optical surface, and is totally reflected by the third optical surface transmits to the fifth optical surface through the glued surface, is incident to the tenth optical surface after being totally reflected by the fifth optical surface, and is incident to the sixth optical surface after being totally reflected by the tenth optical surface. surface, incident to the tenth optical surface after being reflected by the sixth optical surface, incident to the fifth optical surface after being totally reflected by the tenth optical surface, and incident to the fifth optical surface after being totally reflected by the fifth optical surface The glued surface is reflected to the fifth optical surface, and after being reflected by the fifth optical surface, it is transmitted to the third optical surface through the glued surface, and transmitted through the third optical surface to form the first optical surface. The exit beam enters the user's eye.

The second imaging light beam is incident on the second prism through the sixth optical surface, is incident on the fifth optical surface after being totally reflected by the tenth optical surface, and is totally reflected by the fifth optical surface transmitted to the third optical surface through the glued surface, incident to the ninth optical surface after being totally reflected by the third optical surface, and incident to the first optical surface after being totally reflected by the ninth optical surface. surface, incident to the ninth optical surface after being reflected by the first optical surface, incident to the third optical surface after being totally reflected by the ninth optical surface, and incident to the third optical surface after being totally reflected by the third optical surface The glued surface reflects to the third optical surface, transmits through the third optical surface, and forms the second outgoing light beam to enter the user's eyes.

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

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

The sixth optical surface includes a spherical surface, an aspheric surface or a plane.

Optionally, a first optical film is provided on the surface of the first optical surface, and the first optical film is used 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, a third optical film is provided on the second optical surface and/or the fourth optical surface;

The third optical film is used to transmit the first imaging light beam incident from the side of the first prism, reflect the first imaging light beam incident from the side of the second prism, and transmit the first imaging light beam incident from the side of the second prism. The incident first imaging beam is also used to transmit the second imaging beam incident from the side of the second prism and reflect the second imaging beam incident from the side of the first prism;

The fifth optical surface is provided with a fourth optical film; the fourth optical film is used to reflect the first imaging light beam or the second imaging light beam.

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

Optionally, both the first display unit and the second display unit include 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, and a beam generator , at least one of a laser and an optical modulator.

The present invention provides an augmented reality display system, which includes: a first prism, a second prism, a first display unit and a second display unit; the first prism at least includes a first optical surface, a second optical surface And the third optical surface; the second prism at least includes the fourth optical surface, the fifth optical surface and the sixth optical surface; the second optical surface and the fourth optical surface form a glued surface; the third optical surface is parallel to the fifth optical surface; The first display unit is used to emit the first imaging beam, the first optical surface is located on the propagation path of the first imaging beam; the second display unit is used to emit the second imaging beam, and the sixth optical surface is located on the propagation path of the second imaging beam Above; the first imaging beam sequentially passes through the first prism, the cemented surface and the second prism, and then transmits on the cemented surface to form the first outgoing beam; The second outgoing beam is formed by reflection; the ambient light is sequentially transmitted through the second prism and the first prism to form the third outgoing beam; the first outgoing beam and the second outgoing beam enter the user's eyes to form a virtual image, and the third outgoing beam enters the user's eye To form a physical image, the imaging light beam emitted by the first display unit and the second display unit is adjusted through the first prism and the second prism to form the first outgoing light beam and the second outgoing light beam, and the ambient light passes through the first prism and the second prism. The second prism forms the third outgoing light beam, and the first outgoing light beam, the second outgoing light beam and the third outgoing light beam are superimposed to present an image display at the user's eyes, while effectively reducing the overall volume of the system and improving user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description Although it is some specific embodiments of the present invention, for those skilled in the art, the basic concepts of device structures, driving methods and manufacturing methods disclosed and suggested by various embodiments of the present invention can be expanded and extended to Undoubtedly, other structures and drawings should fall within the scope of the claims of the present invention.

FIG. 1 is a schematic structural diagram of an augmented reality display system provided by an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional schematic diagram of another augmented reality display system provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another augmented reality display system provided by an embodiment of the present invention;

Fig. 5 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention;

Fig. 6 is a schematic cross-sectional schematic diagram of another augmented reality display system provided by an embodiment of the present invention;

Fig. 7 is a schematic cross-sectional schematic diagram of another augmented reality display system provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an augmented reality display system provided by an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention;

Fig. 10 is a schematic cross-sectional schematic diagram of another augmented reality display system provided by an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of an augmented reality display system provided by an embodiment of the present invention;

Fig. 12 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention;

Fig. 13 is a schematic cross-sectional schematic diagram of another augmented reality display system provided by an embodiment of the present invention;

FIG. 14 is a schematic structural view of a polarizing beam splitting film provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through implementation with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the embodiment of the present invention. Some, but not all, embodiments. All other embodiments obtained by those skilled in the art based on the basic concepts disclosed and suggested by the embodiments of the present invention belong to the protection scope of the present invention.

Figure 1 is a schematic structural diagram of an augmented reality display system provided by an embodiment of the present invention, Figure 2 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention, and Figure 3 is another schematic diagram of an augmented reality display system provided by an embodiment of the present invention A schematic diagram of a cross-sectional principle of an augmented reality display system, 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 includes at least the first optical surface 1, the second optical surface 2, and the third optical surface 3; the second prism 20 includes at least the fourth optical surface 4, the fifth optical surface 5, and the sixth optical surface 6; The second optical surface 2 and the fourth optical surface 4 form a glued surface; the third optical surface 3 is parallel to the fifth optical surface 5; the first display unit 11 is used to emit the first imaging light beam, and the first optical surface 1 is located in the first imaging On the propagation path of the light beam; the second display unit 12 is used to emit the second imaging light beam, and the sixth optical surface is located on the propagation path of the second imaging light beam; the first imaging light beam passes through the first prism 10, the glued surface and the second prism in sequence After 20, transmission occurs on the glued surface to form the first outgoing beam; the second imaging beam passes through the second prism, the glued surface and the first prism 10 in turn, and then reflects on the glued surface to form the second outgoing beam; the ambient light passes through the second prism 20 in turn and the first prism 10 to form a third outgoing light beam; the first outgoing light beam and the second outgoing light beam enter the user's eyes to form a virtual image, and the third outgoing light beam enters the user's eye to form a physical image.

Wherein, the first prism 10 and the second prism 20 can be made of the same optical material such as optical glass or optical resin, and the first prism 10 and the second prism 20 can be prepared by selecting optical resin materials, so as to ensure the light weight of the augmented reality display system, The manufacturing cost is low and mass production is possible. As shown in Figures 1-3, the 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 includes a fourth optical surface 4, a fifth optical surface The surface 5 and the sixth optical surface 6, the first optical surface 1 and the sixth optical surface 6 are both aspheric surfaces, the first optical surface 1 protrudes toward the side of the first display unit 11; the second optical surface 2, the third optical surface The optical surface 3, the fourth optical surface 4 and the fifth optical surface 5 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 Both are provided with a semi-transparent and semi-reflective light-splitting film as an example. The second optical surface 2 and the fourth optical surface 4 form a glued surface. The glued surface can reduce the volume of the augmented reality display device and reduce the propagation path of the imaging beam. The second optical surface 2 is provided with a semi-transparent and semi-reflective dichroic film, which can partially reflect and partially transmit the imaging beam, thereby realizing effective beam screening; the third optical surface 3 is parallel to the fifth optical surface 5, that is, the first optical surface 1 and the fifth optical surface 5 are parallel. The angle between the second optical surface 2 and the angle between the fourth surface and the fifth surface are the same, the angle between the first optical surface 1 and the second optical surface 2 and the angle between the fourth surface and the fifth surface The angle between them is between 20° and 35°. Since the first optical surface 1 is a convex aspheric surface, the angle between the tangent line along the apex of the first optical surface 1 and the second optical surface 2 and the fifth The angle between the optical surface 5 and the sixth optical surface 6 is equal, the angle between the tangent line of the vertex of the first optical surface 1 and the second optical surface 2 and the angle between the fifth optical surface 5 and the sixth optical surface 6 The included angle is between 24° and 105°, and the angle relationship between the optical surfaces is reasonably set to ensure the propagation path of the imaging beam. Both the first display unit 11 and the second display unit 12 are used to emit the imaging beam, so that the imaging beam passes through the first prism 10 and the second prism 20 to adjust the propagation direction and effectively filter the beam, and finally form the first outgoing beam and the second The outgoing light beam enters the user's eyes to form a virtual image. The imaging light beams emitted by the first display unit 11 and the second display unit 12 can be the same or different. The specific situation can be selected according to the actual design requirements. The embodiment of the present invention does not make specific limited. 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. Ambient light (as shown by the dotted line in the figure) can be natural light, which is transmitted through the second prism 20 and the first prism 10 in turn to form a third outgoing light beam, which enters the user's eyes to form a physical image. The first outgoing light, the second outgoing light beam and The third outgoing light beam and the three kinds of light beams are superimposed to realize an augmented reality display image with multiple depths of field presented to the user's eyes.

In the embodiment of the present invention, a first prism including at least a first optical surface, a second optical surface, and a third optical surface, and a prism including at least a fourth optical surface, a fifth optical surface, and a sixth optical surface are set in the augmented reality display system. The second prism, the first display unit for emitting the first imaging light beam, and the second display unit for emitting the second imaging light beam. 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 all pass through the first prism, the cemented surface and the second prism, and then transmit on the cemented surface to form the first outgoing light beam and the second outgoing light beam; the ambient light is transmitted through the second prism and the first prism Finally, the third outgoing light beam is formed; the first outgoing light beam and the second outgoing light beam enter the user's eyes to form a virtual image, and the third outgoing light beam enters the user's eye to form a real image, which can be superimposed to improve the depth of field effect of imaging and ensure the user's visual experience. At the same time, the miniaturization and light weight of the augmented reality display system can be realized.

Continuing to refer to Fig. 2 and Fig. 3, optionally, the first imaging light beam is incident on the first prism 10 through the first optical surface 1, and is transmitted to the fifth optical surface 5 through the cemented surface after being totally reflected by the third optical surface 3, and then transmitted to the fifth optical surface 5 through the cemented surface. After being totally reflected by the fifth optical surface 5, it is incident on the sixth optical surface 6, after being reflected by the sixth optical surface 6, it is incident on the fifth optical surface 5, and after being totally reflected by the fifth optical surface 5, it is reflected to the fifth optical surface by the glued surface 5. After being reflected by the fifth optical surface 5, it is transmitted to the third optical surface 3 through the glued surface, and then transmitted through the third optical surface 3 to form the first outgoing light beam and enter the user's eyes;

The second imaging light beam enters the second prism 20 through the sixth optical surface 6, is transmitted to the third optical surface 3 through the glued surface after being totally reflected by the fifth optical surface 5, and is incident on the first prism after being totally reflected by the third optical surface 3. The optical surface 1 is incident to the third optical surface 3 after being reflected by the first optical surface 1, reflected to the third optical surface 3 by the cemented surface after being totally reflected by the third optical surface 3, and transmitted through the third optical surface 3 to form the third optical surface 1 Two outgoing beams enter the user's eye.

Wherein, as shown in FIG. 2 , the first display unit 11 emits the first imaging light beam. Since the first optical surface 1 is provided with a semi-transparent and half-reflective light splitting film, the first imaging light beam can be transmitted through the first optical surface 1 and enter the first imaging light beam. In the prism 10, the first imaging light beam satisfies the total reflection condition on the third optical surface, and passes through the glued surface after the total reflection occurs. Since the glued surface is provided with a semi-transparent and half-reflective spectroscopic film, part of the light is transmitted, part of the light is reflected, and the first imaging light is transmitted. To the fifth optical surface 5, the first imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and is incident on the sixth optical surface 6 after total reflection occurs. An imaging light beam is incident on the fifth optical surface 5 after being reflected on the sixth optical surface, and the first imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and passes through the glued surface after total reflection. Reflective spectroscopic film, part of the light is transmitted, part of the light is reflected, the first imaging beam is reflected to the fifth optical surface 5, because the fifth optical surface 5 is provided with a semi-transparent and semi-reflective spectroscopic film, the first imaging beam is generated on the fifth optical surface 5 After reflection, through the glued surface, because the glued surface is provided with a semi-transparent and semi-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected, the first imaging beam is transmitted to the third optical surface 3, and the first imaging beam does not meet the requirements on the third optical surface 3. Under the condition of total reflection, the first imaging light beam is transmitted through the third optical surface 3 to form the first outgoing light beam and enter the user's eyes to form a virtual image.

As shown in FIG. 3 , the second display unit 12 emits the second imaging light beam. Since the sixth optical surface 6 is provided with a semi-transparent and semi-reflective light splitting film, the second imaging light beam enters the second prism 20 through the sixth optical surface 6, and the sixth optical surface 6 is incident on the second prism 20. The second imaging light beam satisfies the total reflection condition on the fifth optical surface 5. After the total reflection occurs, the glued surface passes through the glued surface. Since the glued surface is provided with a semi-transparent and half-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected. The second imaging light beam is transmitted to the third On the optical surface 3, the second imaging light beam satisfies the total reflection condition on the third optical surface 3, and is incident on the first optical surface 1 after total reflection occurs. Since the first optical surface 1 is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted. Part of the light is reflected, and the second imaging light beam is incident on the third optical surface 3 after being reflected on the first optical surface 1. The second imaging light beam satisfies the total reflection condition on the third optical surface 3. The surface is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted, and part of the light is reflected. The second imaging beam is reflected to the third optical surface 3. The second imaging beam does not meet the total reflection condition on the third optical surface 3. The second imaging beam Transmitted through the third optical surface 3, the second outgoing light beam is formed and enters the user's eyes to form a virtual image.

Fig. 4 is a schematic structural diagram of another augmented reality display system provided by an embodiment of the present invention, Fig. 5 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention, and Fig. 6 is another schematic diagram of an augmented reality display system provided by an embodiment of the present invention A schematic diagram of a cross-sectional principle of an augmented reality display system, as shown in FIGS. The two optical surfaces 2 are adjacent, and the seventh optical surface 7 is parallel to the third optical surface 3;

The first imaging light beam enters the first prism 10 through the first optical surface 1, is incident on the third optical surface 3 after being totally reflected by the seventh optical surface 7, and is transmitted to the fifth optical surface through the glued surface after being totally reflected by the third optical surface 3. The optical surface 5 is incident to the sixth optical surface 6 after being totally reflected by the fifth optical surface 5, incident to the fifth optical surface 5 after being reflected by the sixth optical surface 6, and reflected by the glued surface after being totally reflected by the fifth optical surface 5 To the fifth optical surface 5, reflected by the fifth optical surface 5, transmitted to the third optical surface 3 through the cemented surface, and transmitted through the third optical surface 3, forming the first outgoing light beam to enter the user's eyes;

The second imaging light beam enters the second prism 20 through the sixth optical surface 6, is transmitted to the third optical surface 3 through the glued surface after being totally reflected by the fifth optical surface 5, and is incident to the seventh optical surface 3 after being totally reflected by the third optical surface 3. The optical surface 7 is incident to the first optical surface 1 after being totally reflected by the seventh optical surface 7, incident to the seventh optical surface 7 after being reflected by the first optical surface 1, and incident to the third optical surface 7 after being totally reflected by the seventh optical surface 7. The optical surface 3 is totally reflected by the third optical surface 3 and then reflected to the third optical surface 3 through the cemented surface, and transmitted through the third optical surface 3 to form a second outgoing light beam entering the user's eyes.

Wherein, as shown in FIG. 5 and FIG. 6, the exemplary first prism 10 includes the first optical surface 1, the second optical surface 2, the third optical surface 3 and the seventh optical surface 7; the second prism 20 includes the first optical surface Four optical surfaces 4, the fifth optical surface 5 and the sixth optical surface 6, the first optical surface 1 and the sixth optical surface 6 are aspherical surfaces, and the first optical surface 1 protrudes toward the first display unit 11 side; Two optical surfaces 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; the surface of the first optical surface 1, the surface of the second optical surface 2, the fifth optical surface The surface of the optical surface 5 and the surface of the sixth optical surface 5 are both provided with a semi-transparent and semi-reflective light-splitting film as an example for illustration.

Continuing to refer to FIG. 5 , the first display unit 11 emits the first imaging light beam. Since the first optical surface 1 is provided with a semi-transparent and semi-reflective light splitting film, the first imaging light beam enters the first prism through the first optical surface 1, and the first imaging light beam is incident on the first prism. The light beam satisfies the total reflection condition on the seventh optical surface 7, and enters the third optical surface 3 after total reflection, and the first imaging light beam satisfies the total reflection condition on the third optical surface 3, and enters the sixth optical surface 6 after total reflection , the first imaging light beam is reflected on the sixth optical surface 6 and passes through the glued surface. Since the glued surface is provided with a semi-transparent and half-reflective light-splitting film, part of the light is transmitted and part of the light is reflected, and the first imaging light beam is transmitted to the fifth optical surface 5, The first imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and is incident on the sixth optical surface 6 after total reflection occurs. Since the sixth optical surface 6 is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted and part of the light is reflected. The first imaging light beam is incident on the fifth optical surface 5 after being reflected on the sixth optical surface 6. The first imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and passes through the glued surface after total reflection. The half-reflective light-splitting film transmits part of the light and reflects part of the light. The first imaging light beam is reflected to the fifth optical surface. Since the fifth optical surface 5 is provided with a semi-transparent and half-reflective light-splitting film, part of the light is transmitted and part of the light is reflected. The first After the imaging light beam is reflected on the fifth optical surface 5, it passes through the glued surface. Since the glued surface is provided with a semi-transparent and half-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected. The first imaging light beam is transmitted to the third optical surface 3, and the first imaging beam The light beam does not satisfy the total reflection condition on the third optical surface 3, and the first imaging light beam is transmitted through the third optical surface 3 to form the first outgoing light beam and enter the user's eyes to form a virtual image.

Continuing to refer to FIG. 6 , the second display unit 12 emits the second imaging light beam. Since the sixth optical surface 6 is provided with a semi-transparent and half-reflective light splitting film, the second imaging light beam enters the second prism 20 through the sixth optical surface 6, and the second The imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and passes through the glued surface after the total reflection occurs. Since the glued surface is provided with a semi-transparent and half-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected, and the second imaging light beam is transmitted to the third optical surface. Surface 3, the second imaging light beam satisfies the total reflection condition on the third optical surface 3, and is incident on the seventh optical surface 7 after total reflection occurs, and the second imaging light beam meets the total reflection condition on the seventh optical surface 7, and is incident on the seventh optical surface 7 To the first optical surface 1, since the first optical surface 1 is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted and part of the light is reflected, and the second imaging light beam is incident on the seventh optical surface 7 after being reflected on the first optical surface 1 , the second imaging light beam satisfies the total reflection condition on the seventh optical surface 7, and is incident on the third optical surface 3 after total reflection, the second imaging light beam meets the total reflection condition on the third optical surface 3, and passes through the glued surface after total reflection , because the glued surface is provided with a semi-transparent and semi-reflective spectroscopic film, part of the light is transmitted, and part of the light is reflected, the second imaging beam is reflected to the third optical surface 3, and the second imaging beam does not satisfy the total reflection condition on the third optical surface 3, the first The two imaging light beams are transmitted through the third optical surface 3 to form the second outgoing light beams and enter the user's eyes to form a virtual image.

Further, on the basis of the above-mentioned embodiment in FIG. 6 , FIG. 7 is a schematic cross-sectional schematic diagram of another augmented reality display system provided by an embodiment of the present invention, and the first optical surface 1 of the first prism 10 can be extended to be To ensure the integrity of the first prism 10 in the augmented reality system, the additional optical surfaces are 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 The surface does not have any optical effects, and does not affect the propagation path of the imaging beam. By extending the first optical surface 1, the receiving range of the second imaging beam on the first optical surface 1 is increased, thereby increasing the field of view of the augmented reality display system. angle and the range of motion of the user's eyes.

It should be noted that the second prism 20 can also be provided with an auxiliary optical surface parallel to the fifth optical surface 5, and the auxiliary optical surfaces are respectively adjacent to the fourth optical surface 4 and the sixth optical surface 6, but the first imaging light beam and the second imaging light beam The propagation paths of the light beams in the first prism and the second prism are the same as those described in FIG. 4 and FIG. 5 , and will not be repeated here.

Figure 8 is a schematic structural diagram of an augmented reality display system provided by an embodiment of the present invention, Figure 9 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention, and Figure 10 is another schematic diagram of an augmented reality display system provided by an embodiment of the present invention A schematic diagram of a cross-sectional principle of an augmented reality display system, as shown in FIGS. The face 6 is adjacent, and the eighth optical face 8 is parallel to the fifth optical face 5;

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 glued surface after being totally reflected by the third optical surface 3, and is incident to the eighth optical surface after being totally reflected by the fifth optical surface 5. The optical surface 8 is incident to the sixth optical surface 6 after being totally reflected by the eighth optical surface 8, incident to the eighth optical surface 8 after being reflected by the sixth optical surface 6, and incident to the fifth optical surface 8 after being totally reflected by the eighth optical surface 8. Optical surface 5, after being totally reflected by the fifth optical surface 5, reflected to the fifth optical surface 5 through the glued surface, reflected by the fifth optical surface 5, transmitted to the third optical surface 3 through the glued surface, and transmitted through the third optical surface 3 , forming the first outgoing light beam to enter the user's eyes;

The second imaging light beam enters 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, and is transmitted to the second prism through the glued surface after being totally reflected by the fifth optical surface 5. Three optical surfaces 3, incident to the first optical surface 1 after being totally reflected by the third optical surface 3, incident to the third optical surface 3 after being reflected by the first optical surface 1, and passing through the glued surface after being totally reflected by the third optical surface 3 It is reflected to the third optical surface 3 and transmitted through the third optical surface 3 to form a second outgoing light beam that enters the user's eyes.

Wherein, as shown in FIG. 9 and FIG. 10, the exemplary first prism 10 includes the first optical surface 1, the second optical surface 2, and the third optical surface 3; the second prism 20 includes the fourth optical surface 4, the third optical surface The fifth optical surface 5, the sixth optical surface 6 and the eighth optical surface 8, the first optical surface 1 and the sixth optical surface 6 are aspheric surfaces, and the first optical surface 1 protrudes toward the side of the first display unit 11; 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 fifth optical surface The surface of the optical surface 5 and the surface of the sixth optical surface 6 are provided with semi-transparent and semi-reflective light-splitting films as an example for illustration.

Continuing to refer to FIG. 9 , the first display unit 11 emits the first imaging light beam. Since the first optical surface 1 is provided with a semi-transparent and half-reflective light splitting film, the first imaging light beam enters the first prism 10 through the first optical surface 1, and the first The imaging light beam satisfies the total reflection condition on the third optical surface 3, and passes through the glued surface after total reflection. Since the glued surface is provided with a semi-transparent and half-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected, and the first imaging light beam is transmitted to the fifth optical surface. Surface 5, the first imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and is incident on the eighth optical surface 8 after total reflection, the first imaging light beam meets the total reflection condition on the eighth optical surface 8, and is incident on the eighth optical surface 8 To the sixth optical surface 6, since the sixth optical surface 6 is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted and part of the light is reflected, and the first imaging beam is incident on the eighth optical surface 8 after being reflected on the sixth optical surface 6 , the first imaging light beam satisfies the total reflection condition on the eighth optical surface 8, is incident to the fifth optical surface 5 after total reflection, the first imaging light beam meets the total reflection condition on the fifth optical surface 5, and passes through the glued surface after total reflection , because the glued surface is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted and part of the light is reflected, the first imaging beam is reflected to the fifth optical surface 5, and because the fifth optical surface 5 is provided with a semi-transparent and semi-reflective dichroic film, part of the light Transmission, part of the light reflection, the first imaging beam is reflected on the fifth optical surface 5 and passes through the glued surface. Since the glued surface is provided with a semi-transparent and semi-reflective light splitting film, part of the light is transmitted and part of the light is reflected, and the first imaging beam is transmitted to the second optical surface. Three optical surfaces 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 forms the first outgoing light beam entering the user's eyes to form a virtual image.

Continuing to refer to FIG. 10 , the second display unit 12 emits the second imaging light beam, and since the sixth optical surface 6 is provided with a semi-transparent and half-reflective light splitting film, the second imaging light beam enters the second prism 20 through the sixth optical surface 6, and the second The imaging light beam satisfies the total reflection condition on the eighth optical surface 8, and the second imaging light beam is incident on the fifth optical surface 5 after the total reflection, and the second imaging light beam meets the total reflection condition on the fifth optical surface 5, and is glued after the total reflection occurs. surface, because the glued surface is provided with a semi-transparent and semi-reflective spectroscopic 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, and the second imaging beam satisfies the total reflection condition on the third optical surface 3, resulting in After total reflection, it is incident on the first optical surface 1. Since the first optical surface 1 is provided with a semi-transparent and semi-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected. The second imaging beam is reflected on the first optical surface 1 and then incident on the second optical surface Three optical surfaces 3, the second imaging light beam satisfies the total reflection condition on the third optical surface 3, and after the total reflection occurs, it passes through the glued surface. Since the glued surface is provided with a semi-transparent and half-reflective light splitting film, part of the light is transmitted, and part of the light is reflected. The imaging light beam is reflected to the third optical surface 3, the second imaging light beam does not meet the total reflection condition on the third optical surface 3, the second imaging light beam is transmitted through the third optical surface, forms a second outgoing light beam and enters the user's eyes, forming a virtual image.

Figure 11 is a schematic structural diagram of an augmented reality display system provided by an embodiment of the present invention, Figure 12 is a schematic cross-sectional schematic diagram of an augmented reality display system provided by an embodiment of the present invention, and Figure 13 is another schematic diagram of an augmented reality display system provided by an embodiment of the present invention A cross-sectional schematic diagram of an augmented reality display system, as shown in Figure 12 and Figure 13, optionally, the first prism 10 also includes the ninth optical surface 9, the second prism also includes the tenth optical surface 10, and the ninth optical surface 9 are 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, and the ninth optical surface 9 is parallel to the third optical surface 3, The tenth optical surface 10 is parallel to the fifth optical surface 5;

The first imaging light beam enters the first prism 10 through the first optical surface 1, is incident to the third optical surface 3 after being totally reflected by the ninth optical surface 9, and is transmitted to the first prism through the glued surface after being totally reflected by the third optical surface 3. The fifth optical surface 5 is incident to the tenth optical surface 10 after being totally reflected by the fifth optical surface 5, incident to the sixth optical surface 6 after being totally reflected by the tenth optical surface 10, incident to the sixth optical surface 6 after being reflected by the sixth optical surface 6 The tenth optical surface 10 is incident to the fifth optical surface 5 after being totally reflected by the tenth optical surface 10, and is reflected to the fifth optical surface 5 by the glued surface after being totally reflected by the fifth optical surface 5, and after being reflected by the fifth optical surface 5 It transmits to the third optical surface 3 through the glued surface, and then transmits through the third optical surface 3 to form the first outgoing light beam and enter the user's eyes.

The second imaging light beam is incident on the second prism 20 through the sixth optical surface 6, is incident on the fifth optical surface 5 after being totally reflected by the tenth optical surface 10, and is transmitted to the third prism through the glued surface after being totally reflected by the fifth optical surface 5. The optical surface 3 is incident to the ninth optical surface 9 after being totally reflected by the third optical surface 3, incident to the first optical surface 1 after being totally reflected by the ninth optical surface 9, incident to the ninth optical surface 1 after being reflected by the first optical surface 1 The optical surface 9 is incident to the third optical surface 3 after being totally reflected by the ninth optical surface 9, reflected to the third optical surface 3 by the glued surface after being totally reflected by the third optical surface 3, and transmitted through the third optical surface 3 to form The second outgoing beam enters the user's eye.

Wherein, as shown in FIG. 12 and FIG. 13 , the exemplary first prism 10 mirror includes the first optical surface 1, the second optical surface 2, the third optical surface 3 and the seventh optical surface 7; the second prism includes the first optical surface Four optical surfaces 4, the fifth optical surface 5, the sixth optical surface 6 and the eighth optical surface 8, the first optical surface 1 and the sixth optical surface 6 are aspherical surfaces, the first optical surface 1 faces the first display unit 11 One side is convex; 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 flat; the first optical surface 1 The surface, 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 semi-transparent and semi-reflective light-splitting film as an example for illustration.

Continuing to refer to FIG. 12 , the first display unit 11 emits the first imaging light beam. Since the first optical surface 1 is provided with a semi-transparent and half-reflective light-splitting film, the first imaging light beam enters the first prism 10 through the first optical surface 1, and the first The imaging light beam satisfies the total reflection condition at the ninth optical surface 9, and is incident on the third optical surface 13 after the total reflection occurs. The surface is provided with a semi-transparent and semi-reflective dichroic 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 on the fifth optical surface 5 and is incident after total reflection. To the tenth optical surface 10, the first imaging light beam satisfies the total reflection condition on the tenth optical surface 10, and is incident on the sixth optical surface 6 after total reflection occurs. Since the sixth optical surface 6 is provided with a semi-transparent and semi-reflective dichroic film, part The light is transmitted, part of the light is reflected, the first imaging light beam is incident on the tenth optical surface 10 after being reflected on the sixth optical surface 6, the first imaging light beam meets the total reflection condition on the tenth optical surface 10, and is incident on the first imaging light beam after being totally reflected. Five optical surfaces 5, the first imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and passes through the glued surface after the total reflection occurs. Since the glued surface is provided with a semi-transparent and semi-reflective light-splitting film, part of the light is transmitted and part of the light is reflected. The first The imaging light beam is reflected to the fifth optical surface 5. Since the fifth optical surface 5 is provided with a semi-transparent and semi-reflective light-splitting film, part of the light is transmitted and part of the light is reflected. Since the glued surface is provided with a semi-transparent and semi-reflective spectroscopic film, part of the light is transmitted and part of the light is reflected, the first imaging beam is transmitted to the third optical surface, and the first imaging beam does not satisfy the total reflection condition on the third optical surface 3, the first imaging beam The light beam is transmitted through the third optical surface 3 to form a first outgoing light beam and enter the user's eyes to form a virtual image.

Continuing to refer to FIG. 13 , the second display unit 12 emits the second imaging light beam. Since the sixth optical surface 6 is provided with a semi-transparent and half-reflective light splitting film, the second imaging light beam enters the second prism 20 through the sixth optical surface 6, and the second The imaging light beam satisfies the total reflection condition at the tenth optical surface 10, and is incident on the fifth optical surface 5 after the total reflection occurs. The surface is provided with a semi-transparent and semi-reflective dichroic 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 satisfies the total reflection condition on the third optical surface 3 and is incident after total reflection. To the ninth optical surface 9, the second imaging light beam satisfies the total reflection condition on the ninth optical surface 9, and is incident on the first optical surface 1 after total reflection occurs. Since the first optical surface 1 is provided with a semi-transparent and semi-reflective dichroic film, part The light is transmitted, part of the light is reflected, the second imaging light beam is incident on the ninth optical surface 9 after being reflected on the first optical surface 1, the second imaging light beam meets the total reflection condition on the ninth optical surface 9, and is incident on the ninth optical surface 9 after total reflection. Three optical surfaces 3, the second imaging light beam satisfies the total reflection condition on the third optical surface 3, and after the total reflection occurs, it passes through the glued surface. Since the glued surface is provided with a semi-transparent and half-reflective light splitting film, part of the light is transmitted, and part of the light is reflected. The imaging light beam is reflected to the third optical surface 3, the second imaging light beam does not satisfy the total reflection condition on the third optical surface 3, the second imaging light beam is transmitted through the third optical surface 3, forms a second outgoing light beam and enters the user's eyes, forming a virtual image .

Optionally, the first optical surface 1 includes an aspherical surface, and the first optical surface 1 protrudes toward the side of the first display unit 11;

The second optical surface 2, the third optical surface 3, the fourth optical surface 4 and the fifth optical surface 5 all include planes;

The sixth optical surface 6 includes a spherical surface, an aspheric surface, or a plane.

Wherein, the first optical surface 1 can be an aspheric surface, and the first optical surface 1 is convex toward the side of the first display unit 11, and its best fitting radius is between 40 and 80 mm, which can ensure that the imaging light beam is incident after being reflected. As far as the first optical surface 1 is concerned, since the first optical surface 1 is an aspheric surface, it has a focal power, which can reflect and emit the imaging light beam, and can control the propagation angle of the imaging light beam. The second optical surface 2, the third optical surface 3, the fourth optical surface 4, and the fifth optical surface 5 may include flat surfaces, while 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 the total reflection of the imaging light beam, thereby regulating the 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. The surface type of the sixth optical surface can be selected according to actual design requirements. The present invention Examples are not specifically limited.

Optionally, a first optical film is provided on the surface of the first optical surface 1, and the first optical film is used to transmit the first imaging beam and reflect the second imaging 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.

Wherein, a first optical film is provided on the surface of the first optical surface 1, and the first optical film may also be a transflective spectroscopic film or a specific wavelength reflective film. The first optical film is used to transmit the first imaging beam and reflect the second imaging beam. beam. A second optical film is provided on the surface of the second optical surface 2. The second optical film can also be a semi-transparent and semi-reflective splitting film or a specific wavelength reflective film. The second optical film is used to transmit the second imaging beam and reflect the first imaging 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 that finally enters the human eye, the first optical film and the second optical film It can be a semi-transparent and semi-reflective film; when the first imaging light beam emitted by the first display unit 11 is different from the second imaging light beam emitted by the second display unit 12, in order to ensure the display effect of the picture that finally enters the human eye, the first The first optical film and the second optical film may be wavelength-specific reflective films. The types of the first optical film and the second optical film can be selected according to actual design requirements, which are not specifically limited in the embodiment of the present invention.

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

The third optical film 3 is used to transmit the first imaging light beam incident from the side of the first prism 10, and reflect the first imaging light beam incident from the side of the second prism 20 and transmit the first imaging light beam incident from the side of the second prism 20, It is also used to transmit the second imaging light beam incident from the side of the second prism 20 and reflect the second imaging light beam incident from the side of the first prism 10;

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

Wherein, the second optical surface 2 and the fourth optical surface 4 are glued together to form a glued surface. In order to ensure that the glued surface is selected for the imaging light beam, the third optical film 3 can be an ordinary light-splitting film, such as a semi-transparent and half-reflective light-splitting film. The reflectivity of the film to the wavelength range of 450-650nm is between 30-70. In the above-mentioned Figures 2, 3, 5, 6, 9, 10, 12 and 13, the prisms are coated with semi-transparent and semi-transparent The anti-spectroscopic film is used as an example for illustration, or the third optical film is a polarized spectroscopic film, and the polarized spectroscopic film transmits and reflects P light with a wavelength range of 450-650 nm, or transmits S light and reflects P light. Fig. 14 is a schematic structural diagram of a polarizing beam-splitting film provided by 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 a polarizing beam-splitting film 32, the corresponding The polarization state of the light beam is adjusted, and the two sides of the polarization splitting film 32 are respectively provided with a first quarter-wave plate 31 and a second quarter-wave plate 33, the embodiment is based on the second imaging light beam of FIG. 10 Propagation path, the second optical surface is provided with a polarization splitting film that transmits P light and reflects S light. There is a semi-transparent and half-reflective dichroic film, the second imaging beam is incident on the second prism 20 through the sixth optical surface 6, and the second imaging beam satisfies the total reflection condition on the eighth optical surface 8, and the second imaging beam is incident on the The fifth optical surface 5, the second imaging light beam satisfies the total reflection condition on the fifth optical surface 5, and passes through the glued surface after the total reflection occurs, because the glued surface is provided with a polarized beam splitter film 32 for P light transmission and S light reflection and a first quarter splitting film. One 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 does not change, the second imaging light beam passes through the polarization beam splitting film 32, due to the polarization splitting The property of the film 32 is that P light transmits and S light reflects, the polarization state of the second imaging light beam emitted by the polarizing beam splitting film 32 is P light, and after the second imaging light beam enters the second quarter-wave plate 33, due to the second four Due to the phase retardation effect of the quarter-wave plate 33 , the polarization state of the second imaging light beam emitted by 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 elliptically polarized light, since the sixth optical surface 6 is provided with a semi-transparent and half-reflective light splitting film, the second imaging light beam enters the second imaging light beam through the sixth optical surface 6 In the prism 2, the second imaging light beam satisfies the total reflection condition on the eighth optical surface 8, and the second imaging light beam is incident on the fifth optical surface 5 after the total reflection occurs, and the second imaging light beam meets the total reflection condition on the fifth optical surface 5, and occurs After the total reflection, through the glued surface, because the glued surface is provided with the polarizing beam splitting film 32 for the transmission of P light and the reflection of S light and 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 A quarter-wave plate 31, due to the phase retardation effect of the first quarter-wave plate 31, the polarization state of the second imaging beam changes into P light, and the second imaging beam passes through the polarization splitting film 32, due to the polarization splitting The property of the film 32 is that P light is transmitted and S light is reflected, and the polarization state of the second imaging light beam emitted by the polarization splitting film is P light. After the second imaging light beam enters the second quarter wave plate 33, due to the second quarter wave Due to the phase retardation effect of the first quarter-wave plate 33 , the polarization state of the second imaging light beam exiting 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 P light, since the sixth optical surface 6 is provided with a semi-transparent and half-reflective light splitting film, the second imaging light beam enters the second prism through the sixth optical surface 6 20. The second imaging light beam satisfies the total reflection condition on the eighth optical surface 8, and the second imaging light beam is incident on the fifth optical surface 5 after the total reflection occurs, and the second imaging light beam meets the total reflection condition on the fifth optical surface 5, and the total reflection occurs. After reflection, through the glued surface, because the glued surface is provided with the polarizing beam splitting film 32 and the first quarter-wave plate 31 and the second quarter-wave plate 33 that P light transmits and S light reflects, the second imaging light beam passes through the first Quarter-wave plate 31, due to the phase retardation effect of the first quarter-wave plate 31, the polarization state of the second imaging beam changes and becomes elliptically polarized light, and the second imaging beam passes through the polarization splitting film 32, due to the polarization The property of the light splitting film 32 is that P light is transmitted and S light is reflected, and the polarization state of the second imaging light beam emitted by the polarization light splitting film 32 is P light. After the second imaging light beam enters the second quarter-wave plate 33, due to the second Due to the phase retardation effect of the quarter-wave plate 33 , the polarization state of the second imaging light beam emitted by the second quarter-wave plate 33 is elliptically polarized light, and enters the first prism 10 .

The second imaging light beam that presents an elliptical polarization state is transmitted to the third optical surface 3 through the glued layer, and the second imaging light beam satisfies the total reflection condition on the third optical surface 3, and is incident on the first optical surface 1 after total reflection, due to the first The optical surface 1 is provided with a semi-transparent and semi-reflective dichroic film, part of the light is transmitted, and part of the light is reflected. The second imaging beam is reflected on the first optical surface 1 and then enters the third optical surface 3. The second imaging beam is reflected on the third optical surface. 3 Satisfy the total reflection condition, after the total reflection occurs, through the glued surface, because the glued surface is provided with a polarizing beam splitter 32 film for P light transmission and S light reflection, and a first quarter wave plate 31 and a second quarter wave plate 33 , the second imaging beam passes through the second quarter-wave plate 33, due to the phase retardation effect of the second quarter-wave plate 33, the polarization state of the second imaging beam emitted from the second quarter-wave plate 33 Changes to become S light, the second imaging beam passes through the polarization beam splitting film 32, because the property of the polarization beam splitting film 32 is that P light is transmitted and S light is reflected, the second imaging beam is reflected by the polarization beam splitting film 32, and the second imaging beam enters again After the second quarter-wave plate 33, due to the phase retardation effect of the second quarter-wave plate 33, the polarization state of the second imaging beam reflected by the second quarter-wave plate 33 is elliptically polarized light, Entering 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 on the third optical surface 3, and the second imaging light beam is transmitted through the third optical surface 3 to form a second outgoing The light beam enters the user's eyes, forming a virtual image. For the augmented reality display system shown in Fig. 2, Fig. 4, Fig. 8 and Fig. 11, a polarization splitting film can also be provided on the second optical surface and/or the fourth optical surface, and the polarization state change process of the specific imaging beam is the same as that described in Fig. 10 above. The principle of the propagation process of the imaging light beam is the same, so I won’t go into details again.

The setting of the third optical film can be provided with the third optical film on the second optical surface 2, and the third optical film is not provided on the fourth optical surface 4; the third optical film is provided on the fourth optical surface 4, and the third optical film is not provided on the second optical surface 2 Three optical films; both the second optical surface 2 and the fourth optical surface 4 are provided with a third optical film. In order to reduce the production cost of the augmented reality display system, the third optical film can be arranged on only one side of the second optical surface or the fourth optical surface. The specific arrangement of the membrane can be selected according to actual design requirements, and is not specifically limited in the embodiment of the present invention. The fifth optical film can also be a semi-transparent and semi-reflective spectroscopic film or a specific wavelength reflective film, and the specific setting method can be selected 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 2-12mm, the thickness of the second prism 20 is 2-12mm; the length of the third optical surface 3 is 10-25mm; the length of the fifth optical surface 5 is 8-25mm.

Wherein, because the third optical surface 3 of the first prism 10 is parallel to the fifth optical surface of the second prism 20, the second optical surface 2 of the first prism 10 and the fourth optical surface 4 of the second prism 20 are glued, and then can Ensure that the thickness of the first prism 10 and the second prism 20 are the same, compared with the prior art, the thickness of the first prism 10 and the second prism 20 can be 2-12mm, and the length of the third optical surface 3 is 10-25mm ; The length of the fifth optical surface 5 is 8-25mm. Reasonable design of the thickness of the prism and the length of the optical surface can ensure the small volume of the augmented reality display system.

Optionally, both the first display unit 11 and the second display unit 12 include 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 beam generator, a laser and at least one of the light modulators.

Wherein, the size of the first display unit 11 and the second display unit 12 is between 0.1 inch and 1 inch, so as to ensure that the first imaging light beam emitted by the first display unit 11 can enter the first prism and the first imaging beam emitted by the second display unit 12. The two imaging light beams 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 liquid crystal displays, light-emitting diode displays, organic light-emitting diode displays, micro-light-emitting diode displays, reflective displays, diffractive Various types of light sources, projectors, beam generators, lasers, and light modulators can be selected according to actual design requirements, which are not specifically limited in the embodiments of the present invention.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, readjustments, mutual combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. An augmented reality display system, comprising: a first prism, a second prism, a first display unit and a second display unit; The first prism includes at least a first optical surface, a second optical surface and a third optical surface; The second prism includes at least a fourth optical surface, a fifth optical surface and a sixth optical surface; The second optical surface forms a glued surface with the fourth optical surface; The third optical surface is parallel to the fifth optical surface; The first display unit is configured to emit a first imaging light beam, and the first optical surface is located on a propagation path of the first imaging light beam; The second display unit is configured to emit a second imaging light beam, and the sixth optical surface is located on a propagation path of the second imaging light beam; The first imaging beam passes through the first prism, the glued surface and the second prism in sequence, and then transmits on the glued surface to form a first outgoing beam; The second imaging beam sequentially passes through the second prism, the glued surface and the first prism, and then reflects on the glued surface to form a second outgoing beam; Ambient light sequentially passes through the second prism and the first prism to form a third outgoing light beam; The first outgoing light beam and the second outgoing light beam enter the user's eyes to form a virtual image, and the third outgoing light beam enters the user's eye to form a physical image. 2. The augmented reality display system according to claim 1, wherein the first imaging light beam is incident on the first prism through the first optical surface, is totally reflected by the third optical surface and then passes through the prism. The glued surface transmits to the fifth optical surface, is incident to the sixth optical surface after being totally reflected by the fifth optical surface, and is incident to the fifth optical surface after being reflected by the sixth optical surface, After being totally reflected by the fifth optical surface, it is reflected to the fifth optical surface through the glued surface, and is transmitted to the third optical surface through the glued surface after being reflected by the fifth optical surface. forming the first outgoing light beam to enter the user's eyes after being transmitted by the third optical surface; The second imaging light beam enters the second prism through the sixth optical surface, is totally reflected by the fifth optical surface, and then transmits to the third optical surface through the glued surface, and passes through the third optical surface. Incident to the first optical surface after being totally reflected by the optical surface, incident to the third optical surface after being reflected by the first optical surface, reflected to the said glued surface after being totally reflected by the third optical surface The third optical surface is transmitted through the third optical surface to form the second outgoing light beam to enter the user's eyes. 3. The augmented reality display system according to claim 1, wherein the first prism further comprises a seventh optical surface, and the seventh optical surface is connected to the first optical surface and the second optical surface respectively. faces are contiguous, and the seventh optical face is parallel to the third optical face; The first imaging light beam is incident on the first prism through the first optical surface, is incident on the third optical surface after being totally reflected by the seventh optical surface, and is totally reflected by the third optical surface transmitted through the glued surface to the fifth optical surface, incident to the sixth optical surface after being totally reflected by the fifth optical surface, and incident to the fifth optical surface after being reflected by the sixth optical surface , after being totally reflected by the fifth optical surface, reflected to the fifth optical surface by the glued surface, reflected by the fifth optical surface, transmitted to the third optical surface by the glued surface, and passed through the glued surface transmitting through the third optical surface, forming the first outgoing light beam to enter the user's eyes; The second imaging light beam enters the second prism through the sixth optical surface, is totally reflected by the fifth optical surface, and then transmits to the third optical surface through the glued surface, and passes through the third optical surface. Incident to the seventh optical surface after total reflection of the optical surface, incident to the first optical surface after total reflection of the seventh optical surface, incident to the seventh optical surface after reflection of the first optical surface , incident to the third optical surface after being totally reflected by the seventh optical surface, reflected to the third optical surface by the glued surface after being totally reflected by the third optical surface, passing through the third optical surface surface transmission, forming the second outgoing light beam to enter the user's eyes. 4. The augmented reality display system according to claim 1, wherein the second prism further comprises an eighth optical surface, and the eighth optical surface is connected to the fourth optical surface and the sixth optical surface respectively. faces are contiguous, and the eighth optical face is parallel to the fifth optical face; The first imaging light beam enters the first prism through the first optical surface, is totally reflected by the third optical surface, and then transmits to the fifth optical surface through the glued surface, and passes through the fifth optical surface. Incident to the eighth optical surface after being totally reflected by the optical surface, incident to the sixth optical surface after being totally reflected by the eighth optical surface, incident to the eighth optical surface after being reflected by the sixth optical surface , incident to the fifth optical surface after being totally reflected by the eighth optical surface, reflected by the glued surface to the fifth optical surface after being totally reflected by the fifth optical surface, passing through the fifth optical surface After surface reflection, it transmits to the third optical surface through the glued surface, and transmits through the third optical surface to form the first outgoing light beam to enter the user's eyes; The second imaging light beam is incident on the second prism through the sixth optical surface, is incident on the fifth optical surface after being totally reflected by the eighth optical surface, and is totally reflected by the fifth optical surface transmitted through the glued surface to the third optical surface, incident to the first optical surface after being totally reflected by the third optical surface, and incident to the third optical surface after being reflected by the first optical surface After being totally reflected by the third optical surface, it is reflected to the third optical surface by the glued surface, and transmitted by the third optical surface, forming the second outgoing light beam to enter the eyes of the user. 5. The augmented reality display system according to claim 1, wherein the first prism further comprises a ninth optical surface, the second prism further comprises a tenth optical surface, and the ninth optical surface is respectively connected to The first optical surface is adjacent to the second optical surface, the tenth optical surface is adjacent to the fourth optical surface and the sixth optical surface, and the ninth optical surface is adjacent to the third optical surface. The optical surfaces are parallel, and the tenth optical surface is parallel to the fifth optical surface; The first imaging light beam is incident on the first prism through the first optical surface, is incident on the third optical surface after being totally reflected by the ninth optical surface, and is totally reflected by the third optical surface transmits to the fifth optical surface through the glued surface, is incident to the tenth optical surface after being totally reflected by the fifth optical surface, and is incident to the sixth optical surface after being totally reflected by the tenth optical surface. surface, incident to the tenth optical surface after being reflected by the sixth optical surface, incident to the fifth optical surface after being totally reflected by the tenth optical surface, and incident to the fifth optical surface after being totally reflected by the fifth optical surface The glued surface is reflected to the fifth optical surface, and after being reflected by the fifth optical surface, it is transmitted to the third optical surface through the glued surface, and transmitted through the third optical surface to form the first optical surface. The outgoing beam enters the user's eyes; The second imaging light beam is incident on the second prism through the sixth optical surface, is incident on the fifth optical surface after being totally reflected by the tenth optical surface, and is totally reflected by the fifth optical surface transmitted to the third optical surface through the glued surface, incident to the ninth optical surface after being totally reflected by the third optical surface, and incident to the first optical surface after being totally reflected by the ninth optical surface. surface, incident to the ninth optical surface after being reflected by the first optical surface, incident to the third optical surface after being totally reflected by the ninth optical surface, and incident to the third optical surface after being totally reflected by the third optical surface The glued surface reflects to the third optical surface, transmits through the third optical surface, and forms the second outgoing light beam to enter the user's eyes. 6. The augmented reality display system according to claim 1, wherein the first optical surface comprises an aspheric surface, and the first optical surface is convex toward the side of the first display unit; The second optical surface, the third optical surface, the fourth optical surface, and the fifth optical surface each comprise a plane; The sixth optical surface includes a spherical surface, an aspheric surface or a plane. 7. The augmented reality display system according to claim 1, wherein the first optical surface is provided with a first optical film, and the first optical film is used to transmit the first imaging light beam and reflect the second imaging 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. 8. The augmented reality display system according to claim 1, wherein a third optical film is provided on the second optical surface and/or the fourth optical surface; The third optical film is used to transmit the first imaging light beam incident from the side of the first prism, reflect the first imaging light beam incident from the side of the second prism, and transmit the first imaging light beam incident from the side of the second prism. The incident first imaging light beam is also used to transmit the second imaging light beam incident from the side of the second prism and reflect the second imaging light beam incident from the side of the first prism; The fifth optical surface is provided with a fourth optical film; the fourth optical film is used to reflect the first imaging light beam or the second imaging light beam. 9. The augmented reality display system according to claim 1, wherein the thickness of the first prism is 2-12 mm, the thickness of the second prism is 2-12 mm; 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 according to claim 1, wherein the first display unit and the second display unit both include a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a micro light emitting diode display, At least one of a reflective display, a diffractive light source, a projector, a beam generator, a laser, and a light modulator.

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