CN115629515B

CN115629515B - Stereoscopic projection system, projection system and vehicle

Info

Publication number: CN115629515B
Application number: CN202211090428.0A
Authority: CN
Inventors: 王金蕾; 董天浩; 常天海
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2024-03-01
Anticipated expiration: 2042-07-27
Also published as: CN117518701A; WO2024021574A1; CN115629515A

Abstract

The application provides a stereoscopic projection system, which is applied to the field of display. A stereoscopic projection system includes a backlight assembly, a spatial light modulator, and a diffuser screen. The backlight assembly is used to output two light beams to the spatial light modulator at different angles. The spatial light modulator is used for modulating two light beams according to different image information to obtain two paths of imaging light. The spatial light modulator is used for outputting two paths of imaging light to the diffusion screen at different angles. The diffusion screen is used for diffusing the two paths of imaging light and outputting the diffused two paths of imaging light at different angles. In the present application, by sharing the same spatial light modulator, the cost of the stereoscopic projection system can be reduced.

Description

Stereoscopic projection system, projection system and vehicle

The present application is a divisional application, the original application number is 202210892822.X, the original application date is 2022, 7, 27, and the entire contents of the original application are incorporated herein by reference.

Technical Field

The present disclosure relates to the field of displays, and more particularly, to a stereoscopic projection system and a vehicle including the stereoscopic projection system.

Background

Stereoscopic display requires providing both eyes with image information carrying different parallaxes. Compared with 2D display, stereoscopic display can give better experience to people.

The autostereoscopic display technique is also a stereoscopic display scheme in which the user does not need to wear polarized glasses or shutter glasses. The stereoscopic projection system outputs two paths of imaging light to the left and right eyes of the user, respectively. Specifically, a stereoscopic projection system includes 2 projectors and a diffusion screen. The 2 projectors are used for outputting two paths of imaging light to the diffusion screen in different output directions. The diffusion screen is used for diffusing the two paths of imaging light and outputting the two paths of imaging light at different angles. The two paths of imaging light output by the diffusion screen are respectively irradiated to the left eye and the right eye of the user. The two imaging light paths carry different image information. Thereby providing a stereoscopic visual enjoyment to the user.

In practical applications, the cost of a stereoscopic projection system is high.

Disclosure of Invention

The utility model provides a stereoscopic projection system, projecting system and vehicle, through sharing same spatial light modulator, can reduce stereoscopic projection system's cost.

A first aspect of the present application provides a stereoscopic projection system. A stereoscopic projection system includes a backlight assembly, a spatial light modulator, and a diffuser screen. The backlight assembly is used to output two light beams to the spatial light modulator at different angles. The spatial light modulator is used for modulating two light beams according to different image information to obtain two paths of imaging light. The spatial light modulator is used for outputting two paths of imaging light to the diffusion screen at different angles. The diffusion screen is used for diffusing the two paths of imaging light and outputting the diffused two paths of imaging light at different angles.

In an alternative form of the first aspect, the backlight assembly includes a first light source device and a second light source device. The two light beams include a first light beam and a second light beam. The first light source device and the second light source device are used for outputting a first light beam and a second light beam in a time sharing mode. The first light source device corresponds to the first light beam. The second light source device corresponds to the second light beam. In the present application, different light beams are generated by different light source devices, so that the complexity of the structure of the backlight assembly can be reduced, thereby reducing the production cost.

In an alternative form of the first aspect, the two light beams comprise a first light beam and a second light beam. The backlight assembly is used for outputting a first light beam at a first position and outputting a second light beam at a second position. In the present application, by moving the backlight assembly, the number of light source devices can be reduced, thereby reducing the cost of the stereoscopic projection system.

In an alternative form of the first aspect, the backlight assembly includes a light source device and an optical element. The position of the light source device relative to the spatial light modulator is unchanged. The light source device is used for outputting an original light beam. The optical element is used for obtaining a first light beam according to the original light beam at a first position. The optical element is used for changing the transmission direction of the original light beam at the second position to obtain a second light beam. In the present application, the optical element is moved by a moving mechanism. By moving the optical element, the light source device is fixed, the complexity of the moving mechanism can be reduced, thereby reducing the cost of the moving mechanism.

In an alternative form of the first aspect, there is an overlap region between the first and second light beams output by the optical element. The spatial light modulator is located in the overlap region. When the spatial light modulator is located in the overlap region, the stereoscopic projection system may not need to move the spatial light modulator, thereby reducing the cost of the stereoscopic projection system.

In an alternative form of the first aspect, the backlight assembly includes a light source device and an optical element. The light source device is used for outputting a first original light beam at a third position. The optical element is used for obtaining a first light beam at a first position according to the first original light beam. The light source device is used for outputting a second original light beam at a fourth position. The optical element is used for changing the transmission direction of the second original light beam at the second position to obtain a second light beam. Wherein the offset of the third position and the first position is different from the offset of the fourth position and the second position. By moving the optical element and the light source device, the first light beam and the second light beam irradiation region can be made to overlap as much as possible. When the spatial light modulator is located in the overlapping region, waste of light beams can be reduced. Therefore, the application can improve the utilization rate of the light beam.

In an alternative form of the first aspect, the third and fourth positions lie in a first plane. The light source device is configured to move from a third position to a fourth position via the first path. The first path is parallel to the first straight line. The first straight line is located on the first plane. By linearly moving the light source device, the complexity of the moving mechanism can be reduced and the need for moving space can be reduced compared to a curved moving light source device. Therefore, the cost of the stereoscopic projection system can be reduced and the user experience can be improved.

In an alternative form of the first aspect, the first location and the second location lie in a second plane. The optical element is configured to move from a first position to a second position via a second path. The second path is parallel to the second straight line. The second straight line is located on the second plane. By linearly moving the optical element, the complexity of the movement mechanism can be reduced and the need for movement space reduced compared to moving the optical element in a curve. Therefore, the cost of the stereoscopic projection system can be reduced and the user experience can be improved.

In an alternative form of the first aspect, the first plane and the second plane are parallel. The first path and the second path are parallel. The length of the second path is less than the length of the first path. When the length of the second path is smaller than that of the first path, the irradiation areas of the two light beams can be overlapped as much as possible. When the spatial light modulator is located in the overlap region, waste of light beams is reduced. Therefore, the application can improve the utilization rate of the light beam.

In an alternative form of the first aspect, the optical element is further adapted to change the divergence angle of the second original beam at the second position to obtain the second beam.

In an alternative form of the first aspect, the optical element is configured to increase the spread angle of the second original beam, resulting in the second beam. By increasing the spread angle of the original beam, the distance between the light source device and the spatial light modulator can be reduced. Therefore, the size of the stereoscopic projection system can be reduced, and accordingly user experience is improved.

In an alternative form of the first aspect, the optical element is a variable focus device. When the optical element is a variable-focus device, the optical element can adjust the focal length according to the distance between the user and the diffusion screen, so that the user experience is improved.

In an alternative form of the first aspect, the backlight assembly is configured to move between M positions to output the M light beams at different angles. The M beams include two beams. The M positions include a first position and a second position. The M positions are in one-to-one correspondence with the M light beams. M is an integer greater than 1. By moving between the M positions, the number of backlight assemblies can be reduced while providing more viewing positions. Therefore, the cost of the stereoscopic projection system can be reduced.

In an alternative form of the first aspect, the stereoscopic projection system further comprises an eye tracking module. The human eye tracking module is used for acquiring M viewpoints. The M viewpoints and the M positions are in one-to-one correspondence. The backlight assembly is for moving between M positions among the N positions according to the M viewpoints. The N positions correspond to N views. Only M of the N views may have user views. By moving only between M positions, the image frame rate of a single user can be increased. Therefore, the user experience can be improved.

In an alternative form of the first aspect, N has a value in the range of 2 to 10. When the N value is excessively large, the image frame rate of a single user may be reduced. Therefore, the image frame rate of a single user can be improved by limiting the value of N, so that the user experience is improved.

In an alternative form of the first aspect, the stereoscopic projection system includes K backlight assemblies and a spatial light modulator. K is an integer greater than 1. Each of the K backlight assemblies is configured to output two light beams to the spatial light modulator at different angles, resulting in a 2 x K light beam. The spatial light modulator is used for modulating 2 XK beams to obtain 2 XK imaging light. The spatial light modulator is used to output 2 x K paths of imaging light at different angles to the diffuser screen. The 2 x K beam includes two beams. The 2 x K path imaging light includes two beams of imaging light. In the present application, by introducing K backlight assemblies, more viewing positions can be provided. Therefore, the user experience can be improved.

In an alternative manner of the first aspect, a moving direction of each of the K backlight assemblies during the moving is the same. When the moving direction of each backlight assembly is the same, the complexity of the moving mechanism can be reduced, thereby reducing the cost of the stereoscopic projection system.

In an alternative form of the first aspect, the backlight assembly does not output a light beam during movement of the backlight assembly from the first position to the second position or from the second position to the first position. The beams output during movement may generate crosstalk, thereby affecting the user experience. Therefore, the user experience can be improved.

A second aspect of the present application provides a projection system. The projection system comprises a curved mirror and a stereoscopic projection system as described in the first aspect or any of the alternatives of the first aspect. The stereoscopic projection system is used for outputting two paths of imaging light. The curved mirror is used for reflecting the two paths of diffused imaging light, and an included angle exists between the two paths of reflected imaging light. The focal length of the curved mirror is f. The distance between the diffusion screen and the curved mirror is d. d is less than f. The curved mirror can amplify two paths of imaging light, so that the distance between a user and the diffusion screen can be reduced. Therefore, the user experience can be improved.

A third aspect of the present application provides a vehicle. The vehicle comprises a stereoscopic projection system as described in the first aspect or any of the alternatives of the first aspect, or a projection system as described in the second aspect. The stereoscopic projection system or projection system is mounted on a vehicle.

Drawings

Fig. 1 is a schematic diagram of a first structure of a stereoscopic projection system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a first structure of a display device according to an embodiment of the present application;

fig. 3 is a second schematic structural diagram of a display device according to an embodiment of the present application;

fig. 4a is a schematic diagram of a third structure of a display device according to an embodiment of the present application;

fig. 4b is a schematic diagram of a fourth structure of the display device according to the embodiment of the present application;

fig. 4c is a schematic diagram of a fifth structure of the display device according to the embodiment of the present application;

fig. 5 is a sixth schematic structural diagram of a display device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a backlight assembly according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a second configuration of a stereoscopic projection system according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a third configuration of a stereoscopic projection system according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a fourth configuration of a stereoscopic projection system according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of a projection system according to an embodiment of the present disclosure;

FIG. 11 is a schematic circuit diagram of a stereoscopic projection system according to an embodiment of the present disclosure;

FIG. 12 is a schematic view of a projection system mounted on a vehicle according to an embodiment of the present application;

fig. 13 is a schematic diagram of a possible functional framework of a vehicle according to an embodiment of the present application.

Detailed Description

The utility model provides a stereoscopic projection system, projecting system and vehicle, through sharing same spatial light modulator, can reduce stereoscopic projection system's cost. It is to be understood that the use of "first," "second," etc. herein is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or order. In addition, for simplicity and clarity, reference numbers and/or letters are repeated throughout the several figures of the embodiments of the present application. Repetition does not indicate a tightly defined relationship between the various embodiments and/or configurations.

The stereoscopic projection system in this application may also be referred to as a 3D projection system. The stereoscopic projection system is applied to the field of display. In the display field, stereoscopic visual enjoyment can be provided to a user through a stereoscopic projection system. However, stereoscopic projection systems include 2 projectors, each projector including 1 spatial light modulator, resulting in higher cost of the stereoscopic projection system.

To this end, the present application provides a stereoscopic projection system. Fig. 1 is a schematic diagram of a first structure of a stereoscopic projection system according to an embodiment of the present application. As shown in fig. 1, the stereoscopic projection system 100 includes a display device 101 and a diffusion screen 105. The display device 101 includes a backlight assembly 102, a spatial light modulator 103, and a lens 104. The backlight assembly 102 is used to output two light beams to the spatial light modulator 103 at different angles in a time-sharing manner. The spatial light modulator 103 may be a liquid crystal display (liquid crystal display, LCD), liquid crystal on silicon (liquid crystal on silicon, LCOS), or digital micro-mirror device (DMD), or the like. The spatial light modulator 103 is configured to time-divisionally modulate two light beams according to different image information to obtain two imaging light paths. For example, at a first moment, the spatial light modulator 103 is configured to modulate the first light beam according to the first image information, so as to obtain a first path of imaging light. At a second moment, the spatial light modulator 103 is configured to modulate the second light beam according to the second image information, so as to obtain a second path of imaging light. In fig. 1, a solid line with an arrow indicates the first light beam and the first path of imaging light, and a broken line with an arrow indicates the second light beam and the second path of imaging light.

The spatial light modulator 103 is configured to output two paths of imaging light to the lens 104 at different angles. The lens 104 is used for changing the transmission direction of the two paths of imaging light and transmitting the two paths of transmission light to the diffusion screen 105. The diffusion screen 105 is used for diffusing the two paths of imaging light, and outputting the diffused two paths of imaging light at different angles. The two diffused imaging light beams are irradiated to different viewpoints, for example, left and right eyes of a user. The two imaging light paths carry different image information. When the two paths of imaging light are respectively irradiated to the left eye and the right eye of the user, stereoscopic visual enjoyment can be provided for the user.

In the embodiment of the application, by sharing the same spatial light modulator 103, the spatial light modulator 103 can output two paths of imaging light in a time-sharing manner, so that stereoscopic visual enjoyment is provided for users. Therefore, the embodiments of the present application can reduce the number of spatial light modulators 103 in a stereoscopic projection system, thereby reducing the cost of the stereoscopic projection system.

As can be seen from the foregoing description of fig. 1, the backlight assembly 102 may output two light beams. The directions of transmission of the two beams are different. Possible structures of the backlight assembly 102 are exemplarily described below.

In one example, the backlight assembly 102 includes a plurality of light source devices. The plurality of light source devices time-divisionally output two light beams. Fig. 2 is a schematic diagram of a first structure of a display device according to an embodiment of the present application. As shown in fig. 2, the display device 101 includes a backlight assembly 102 and a spatial light modulator 103. The backlight assembly 102 includes a first light source device 201 and a second light source device 202. The first and second light source devices 201 and 202 may be a light emitting diode (light emitting diode) light source or a Laser Diode (LD) light source, etc. The first light source device 201 and the second light source device 202 are configured to output two light beams in a time-sharing manner. For example, at a first instant, the first light source device 201 is configured to output a first light beam to the spatial light modulator 103. At a second instant in time, the second light source device 202 is used to output a second light beam to the spatial light modulator 103. The spatial light modulator 103 is configured to time-divisionally modulate two light beams according to different image information to obtain two imaging light paths.

In another example, the backlight assembly 102 is moved such that the backlight assembly 102 outputs two light beams at different positions, respectively. Fig. 3 is a second schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 3, the display device 101 includes a backlight assembly 102 and a spatial light modulator 103. The backlight assembly 102 moves between the position a and the position B. At a first instant, the backlight assembly 102 is configured to output a first light beam to the spatial light modulator 103 at position a. At a second instant, the backlight assembly 102 is configured to output a second light beam to the spatial light modulator 103 at position B. The spatial light modulator 103 is configured to time-divisionally modulate two light beams according to different image information to obtain two imaging light paths.

In the foregoing example, two light beams may be time-divisionally output by moving the backlight assembly 102. It should be appreciated that the mobile backlight assembly 102 may be part of the devices in the mobile backlight assembly 102. For example, the backlight assembly 102 includes a light source device and an optical element. The backlight assembly 102 may time-divisionally output two light beams by moving an optical element. This is described below.

Fig. 4a is a schematic diagram of a third structure of the display device according to the embodiment of the present application. As shown in fig. 4a, the display device 101 includes a backlight assembly 102 and a spatial light modulator 103. The backlight assembly 102 includes a light source device 301 and an optical element 302. The light source device 301 is for outputting an original light beam to the optical element 302. The optical element 302 may be a lens, a mirror, a prism, a fresnel mirror, or the like. The optical element 302 is used to obtain a first light beam from the original light beam at a first position. The first light beam is irradiated to the receiving surface 303. The spatial light modulator 103 is disposed on the receiving surface 303.

In fig. 4a, the chief ray and the X-axis of the light source device 301 coincide. The optical axis of the optical element 302 coincides with the X-axis. Accordingly, the principal ray of the light source device 301 and the optical axis of the optical element 302 coincide. When the receiving surface 303 is perpendicular to the X-axis, the principal ray forms an angle α of 90 ° with the receiving surface 303. The display apparatus 101 in the present application changes the angle of the principal ray of the original light beam by using the decentration of the principal ray of the light source device 301 and the optical axis position of the optical element 302 (the principal ray of the light source device 301 and the optical axis of the optical element 302 are offset up and down), thereby causing the optical element 302 to output the second light beam in different transmission directions.

Fig. 4b is a schematic diagram of a fourth structure of the display device according to the embodiment of the present application. As shown in fig. 4b, the optical element 302 is translated upwards on the basis of fig. 4 a. At this time, in fig. 4b, the principal ray and the X-axis of the light source device 301 coincide. The optical axis 304 of the optical element 302 is parallel to the X-axis. The optical axis 304 of the optical element 302 is shifted upward with respect to the principal ray of the light source device 301. Thus, the optical element 302 changes the angle of the chief ray of the original beam (i.e., changes the transmission direction of the original beam), resulting in the second beam. In fig. 4b, the angle of the chief ray of the second beam is shifted upwards. The upwardly offset angle causes the illuminated area of the beam on the receiving surface 303 to move upwardly. The chief ray of the second beam and the receiving surface 303 have an angle beta of more than 90 deg..

Fig. 4c is a schematic diagram of a fifth structure of the display device according to the embodiment of the present application. As shown in fig. 4c, the optical element 302 is translated downward on the basis of fig. 4 a. At this time, in fig. 4c, the principal ray of the light source device 301 coincides with the X-axis. The optical axis 304 of the optical element 302 is parallel to the X-axis. The optical axis 304 of the optical element 302 is offset downward with respect to the chief ray of the light source device 301. Thus, the optical element 302 changes the angle of the chief ray of the original beam (i.e., changes the transmission direction of the original beam), resulting in the second beam. In fig. 4c, the angle of the chief ray of the second beam is shifted downwards. The downward offset angle causes the illuminated area of the beam on the receiving surface 303 to move downward. The angle beta between the chief ray of the second beam and the receiving surface 303 is smaller than 90 deg..

The position of the optical element 302 in fig. 4a is referred to as a first position, and the position of the optical element 302 in fig. 4b or fig. 4c is referred to as a second position. The time that the optical element 302 stays in the first position is referred to as a first time. The time that the optical element 302 stays in the second position is referred to as a second time. At a first time, the optical element 302 outputs a first light beam at a first location. At a second time, the optical element 302 outputs a second light beam at a second location. The first light beam and the second light beam output from the optical element 302 are time-shared to be irradiated on the receiving surface 303. The first light beam and the second light beam have an overlapping region in the irradiation range of the receiving surface 303. The spatial light modulator 103 may be disposed in the overlapping region.

In the foregoing examples, the optical element 302 is located at the first position in fig. 4a, and the optical element 302 is located at the second position in fig. 4b or fig. 4 c. In practice, the optical element 302 may be referred to as a first position and a second position in any of two different positions. For example, the optical element 302 is located at the first position in fig. 4 b. The optical element 302 is configured to change the transmission direction of the original light beam at the first position, so as to obtain a first light beam. The optical element 302 is in the second position in fig. 4 c. The optical element 302 is configured to change the transmission direction of the original light beam at the second position, so as to obtain a second light beam.

As can be seen from the foregoing description of fig. 4a, 4b and 4c, by changing the position of the optical element 302, the irradiation range of the light beam on the receiving surface 303 is changed. At this time, since the irradiation ranges of the first light beam and the second light beam on the receiving surface 303 do not overlap, there is a waste of energy of a part of the light beams. For this reason, in the embodiment of the present application, the irradiation ranges of the first light beam and the second light beam on the receiving surface 303 may also be overlapped as much as possible by moving the light source device 301.

Fig. 5 is a sixth schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 5, the display device 101 includes a backlight assembly 102 and a spatial light modulator 103 (not shown in the drawing). The spatial light modulator 103 is disposed on the receiving surface 303. The backlight assembly 102 includes a light source device 301 and an optical element 302. The backlight assembly 102 can be moved between the position a and the position B by the moving mechanism.

In position a, the light source device 301 is in the third position and the optical element 302 is in the first position. At a first instant, the light source device 301 is configured to output a first original light beam. The optical element 302 is used to obtain a first light beam from a first original light beam. At position a, the optical axis of the optical element 302 is shifted downward with respect to the principal ray of the light source device 301. Accordingly, the angle of the chief ray of the first beam (indicated by the broken line connected to the light source device 301 at position a) is shifted downward. The optical element 302 is configured to change a transmission direction of the first original light beam, so as to obtain a first light beam.

In position B, the light source device 301 is in the fourth position and the optical element 302 is in the second position. At a second instant, the light source device 301 is configured to output a second original light beam. The optical element 302 is used to obtain a second light beam from the second original light beam. At position B, the optical axis of the optical element 302 is shifted upward with respect to the principal ray of the light source device 301. Accordingly, the angle of the chief ray of the second beam (indicated by the broken line connected to the light source device 301 at position B) is shifted upward. The optical element 302 is configured to change the transmission direction of the second original light beam, so as to obtain a second light beam.

For the description of the spatial light modulator 103, reference may be made to the description in any of the foregoing figures 1 to 4 c. When the principal ray of the first light beam and the principal ray of the second light beam overlap on the receiving surface 303, the irradiation ranges of the first light beam and the second light beam on the receiving surface 303 overlap. The size of the irradiation range of the first light beam and the second light beam on the receiving surface 303 may be as large as possible as the size of the spatial light modulator 103. Therefore, the embodiment of the application improves the utilization rate of the light beam.

In fig. 5, at position a, the optical element 302 needs to shift the angle of the chief ray downward. At position B, the optical element 302 needs to shift the angle of the chief ray upward. Therefore, the relative positions of the third position and the first position are different from the relative positions of the fourth position and the second position, i.e., the amounts of offset of the third position and the first position are different from the amounts of offset of the fourth position and the second position.

As can be seen from the foregoing description of fig. 3 to 5, the embodiments of the present application require moving the position of the backlight assembly 102. In the embodiment of the present application, the display device 101 may further include a moving mechanism. The movement mechanism is used to move the optical element 302 and/or the light source device 301. In order to reduce the complexity of the moving mechanism and reduce the need for moving space, the moving mechanism may move the optical element 302 and/or the light source device 301 by straight lines.

Fig. 6 is a schematic structural diagram of a backlight assembly according to an embodiment of the present application. As shown in fig. 6, the backlight assembly 102 includes a light source device 301 and an optical element 302. The moving mechanism is used to move the backlight assembly 102 from the position a to the position B. Wherein the light source device 301 is configured to move from a third position to a fourth position via the first path. The fourth position and the third position lie in a first plane 601. The first path is parallel to the first straight line. The first line lies on a first plane 601. The length of the first path is d1. The optical element 302 is configured to move from a first position to a second position via a second path. The first location and the second location lie in a second plane 602. The second path is parallel to the second straight line. The second line lies on a second plane 602. The second path has a length d2. In order to overlap the irradiation ranges of the first light beam and the second light beam on the receiving surface 303 as much as possible, d2 is smaller than d1. The second plane 602 may be parallel to the first plane 601. The second path may be parallel to the first path. The second plane 602 and the first plane 601 may be perpendicular to the principal ray of the light source device 301.

In the foregoing fig. 5 and 6, the movement of the backlight assembly 102 from the position a to the position B is described. It should be appreciated that in practical applications, the backlight assembly 102 needs to be frequently moved between the positions a and B in order to provide stable stereoscopic viewing enjoyment. Accordingly, regarding the description of the movement of the backlight assembly 102 from the position B to the position a, reference may be made to the related description in fig. 5 or 6. If the backlight assembly 102 outputs a light beam during movement, crosstalk may be caused, thereby affecting the user experience. For this reason, the backlight assembly 102 may not output a light beam during the movement.

In the foregoing description of fig. 4a to 4c, fig. 5 and 6, the optical element 302 is used to change the transmission direction of the original light beam, so as to output the first light beam and the second light beam with different transmission directions. In practice, the optical element 302 may also be used to change the divergence angle of the original beam, resulting in the first beam and/or the second beam. For example, in fig. 5, at position a, the optical element 302 is used to increase the divergence angle of the first original beam, resulting in a first beam. At position B, the optical element 302 is used to increase the divergence angle of the second original beam, resulting in a second beam. By increasing the spread angle of the original light beam, the distance between the light source device 301 and the spatial light modulator 103 can be reduced. Therefore, the embodiment of the application can reduce the size of the stereoscopic projection system, thereby improving the user experience.

In the foregoing description of fig. 5 and 6, the backlight assembly 102 is used to move between the position a and the position B. In practice, the backlight assembly 102 may be used to move between M positions. The backlight assembly 102 is used to output the M light beams at different angles. The M light beams include a first light beam and a second light beam. The M positions include a first position and a second position. The M positions are in one-to-one correspondence with the M light beams. M is an integer greater than 1. The following description will take M equal to 3 as an example.

Fig. 7 is a second schematic structural diagram of a stereoscopic projection system according to an embodiment of the present application. As shown in fig. 7, the stereoscopic projection system 100 includes a display device 101 and a diffusion screen 105. The display device 101 includes a backlight assembly 102, a spatial light modulator 103, and a lens 104. The backlight assembly 102 may be moved among the position a, the position B, and the position C by a moving mechanism.

With respect to the description at position a and position B, reference may be made to the related description in fig. 5 described previously. In position C, the light source device 301 is in the fifth position and the optical element 302 is in the sixth position. At a third instant, the light source device 301 is configured to output a third primary light beam. The optical element 302 is configured to obtain a third light beam according to the third original light beam. The spatial light modulator 103 is configured to modulate the first light beam, the second light beam, and the third light beam to obtain three imaging lights. The lens 104 is used to change the transmission direction of the three imaging lights. The three imaging light irradiates three viewpoints. The three imaging lights are in one-to-one correspondence with the three viewpoints. The three views include view 1, view 2, and view 3.

In the foregoing fig. 7, the description is given taking M equal to 3 as an example. In practical applications, M may also be other values, for example, M equals 4, 6 or 8. By moving between M positions, more viewing positions can be provided. For example, in fig. 7, M positions correspond to M viewpoints. Position B corresponds to viewpoint 1. Position a corresponds to viewpoint 3. Position C corresponds to viewpoint 2. Each of the M viewpoints may correspond to one eye of the user. Any two of the M views correspond to one viewing position. For example, viewpoint 1 corresponds to the left eye of the user and viewpoint 2 corresponds to the right eye of the user. Viewpoint 1 and viewpoint 2 correspond to viewing position 1. For another example, viewpoint 2 corresponds to the left eye of the user and viewpoint 3 corresponds to the right eye of the user. Viewpoint 2 and viewpoint 3 correspond to viewing position 2.

In practical applications, only M views may be viewed by the user from among the N views. By moving only between M positions, the image frame rate of a single user can be increased. Accordingly, to enhance the user experience, the backlight assembly 102 may be moved between M of the N positions. N positions versus N views. At this time, the stereoscopic projection system 100 may further include a human eye tracking module and a processor. The eye tracking module is used for acquiring coordinates of M viewpoints, for example, M viewpoints. The M viewpoints and the M positions are in one-to-one correspondence. The processor is used for controlling the backlight assembly to move between M positions in the N positions according to the M viewpoints. In the following, N is equal to 3 and m is equal to 2.

Fig. 8 is a schematic diagram of a third structure of a stereoscopic projection system according to an embodiment of the present application. As shown in fig. 8, the stereoscopic projection system 100 further includes a human eye tracking module 802 and a processor 801 on the basis of fig. 7. The eye tracking module 802 is configured to obtain M viewpoints. The M views include view 1 and view 2. Viewpoint 1 corresponds to position a. Viewpoint 2 corresponds to position C. The processor 801 is configured to control the backlight assembly 102 to move between M positions of the N positions according to the M viewpoints. The N positions include position A, position B and position C, respectively. The M positions include position A and position C.

It should be understood that fig. 8 is only one example of M locations provided in embodiments of the present application. In practical applications, the processor 801 may control the backlight assembly 102 to move between corresponding M positions according to M viewpoints. For example, the M views include view 2 and view 3. The M positions include position B and position C. For another example, the M views include view 1 and view 3. The M positions include position B and position A.

In practical application, when the N value is too large, the image frame rate of a single user is reduced, thereby affecting the user experience. Therefore, the image frame rate of a single user can be improved by limiting the value of N, so that the user experience is improved. For example, N may range from 2 to 10. N may take on a value of 2 or 10.

When the backlight assembly 102 moves between M positions among the N positions, whether the M positions include the target position may be determined by the following manner. Specifically, if the backlight assembly stays at the target position and the backlight assembly transmits a light beam to the spatial light modulator 103 at the target position, the M positions include the target position.

For example, in fig. 8, the backlight assembly 102 moves between position a and position C. The backlight assembly 102 stays at position a for 1 millisecond. During stay, the backlight assembly 102 outputs a first light beam. After staying for 1 millisecond, the backlight assembly 102 takes 1 millisecond to move from the position a to the position C. The backlight assembly 102 stays at position C for 1 millisecond. During the stay, the backlight assembly 102 outputs the second light beam. After staying for 1 millisecond, the backlight assembly 102 takes 1 millisecond to move from the position C to the position a. The above process is repeated. In the above process, the backlight assembly 102 stays at the positions a and C, and outputs the light beam. Thus, the M positions include position a and position C. In the above process, the backlight assembly 102 may not stay at the position B. Thus, the M positions do not include position B.

For another example, the backlight assembly 102 moves between position a and position B. The backlight assembly 102 stays at position a for 1 millisecond. During stay, the backlight assembly 102 outputs a first light beam. After staying for 1 millisecond, the backlight assembly 102 takes 2 milliseconds to move from the position a to the position B. The backlight assembly 102 stays at position B for 1 millisecond. During the stay, the backlight assembly 102 outputs the second light beam. After staying for 1 millisecond, the backlight assembly 102 takes 2 milliseconds to move from the position B to the position a. The above process is repeated. In the above process, the backlight assembly 102 stays at the position a and the position B, and outputs the light beam. Thus, the M positions include position a and position B. In the above process, the backlight assembly 102 may pass through the position C, but the backlight assembly 102 may not stay at the position C and may not output a light beam at the position C. Thus, the M positions do not include position C.

In actual use, the distance between the user and the diffusion screen 105 will change, thereby applying the user's viewing experience. For example, in fig. 8, the distance between the viewpoint 2 corresponding to the left eye of the user and the diffusion screen 105 is T1. At this time, the spot size of the imaging light obtained from the second light beam on the imaging plane where the viewpoint 2 is located is adapted to the size of the left eye. If the user approaches the diffusion screen 105, the spot irradiated on the left eye becomes large. If the light spots cover the left eye and the right eye of the user at the same time, crosstalk can be generated, and the stereoscopic vision experience of the user is affected.

To this end, the optical element 302 may be a variable focus device. The eye tracking module 802 may be used to obtain the distance between the point of view and the diffusion screen 105. The processor 801 is configured to adjust the focal length of the optical element 302 according to the distance. For example, as the user approaches the diffuser screen 105, the processor 801 reduces the focal length of the optical element 302. When the user moves away from the diffuser screen 105, the processor 801 increases the focal length of the optical element 302.

From the foregoing description, when the N value is too large, the image frame rate of the individual user is reduced, thereby affecting the user experience. Accordingly, to provide more viewing positions, the stereoscopic projection system 100 may include K backlight assemblies to increase the image frame rate of a single user. K is an integer greater than 1. Each of the K backlight assemblies is configured to output two light beams to the spatial light modulator at different angles, resulting in a 2 x K light beam. The spatial light modulator is used for modulating 2 XK beams to obtain 2 XK imaging light. The spatial light modulator is used to output 2 x K paths of imaging light at different angles to the diffuser screen. Regarding the description of any one of the backlight assemblies, reference may be made to the related description in fig. 1 to 8 described previously. The following description will take K equal to 3 as an example.

Fig. 9 is a schematic diagram of a fourth configuration of a stereoscopic projection system according to an embodiment of the present application. As shown in fig. 9, the stereoscopic projection system 100 includes a display device 101 and a diffusion screen 105. The display device 101 includes 3 backlight assemblies, a spatial light modulator 103, and a lens 104. The 3 backlight assemblies include a backlight assembly 102, a backlight assembly 901, and a backlight assembly 902. The backlight assembly 102 time-divisionally outputs the first light beam and the second light beam. Regarding the description of the backlight assembly 901 and the backlight assembly 902, reference may be made to the description of the backlight assembly 102. The 3 backlight assemblies are used to output 6 light beams.

The spatial light modulator 103 is configured to modulate 6 beams to obtain 6 imaging lights. The lens 104 is used for changing the transmission direction of the 6-way imaging light and transmitting the 6-way imaging light to the diffusion screen 105. The diffusion screen 105 is used for diffusing the 6 light beams to obtain 6 paths of imaging light. The 6 imaging lights are respectively irradiated to the viewpoints 1 to 6. The 6 paths of imaging light correspond to the viewpoints 1 to 6 one by one. Two of the viewpoints 1 to 6 correspond to one backlight assembly. In fig. 9, the backlight assembly 102 corresponds to the view 1 and the view 2. The backlight assembly 901 corresponds to the viewpoint 3 and the viewpoint 4. The backlight assembly 902 corresponds to the viewpoint 5 and the viewpoint 6.

It should be appreciated that when the stereoscopic projection system 100 includes K backlight assemblies, one backlight assembly may not correspond to one viewing position. For example, in fig. 9, viewpoint 2 and viewpoint 3 are combined into one viewing position. Viewpoint 4 and viewpoint 5 are combined into one viewing position. At this time, the backlight assembly 102 may output only the light beam corresponding to the viewpoint 2. The backlight assembly 902 may output only the light beam corresponding to the viewpoint 5. The backlight assembly 901 outputs two light beams corresponding to the viewpoint 4 and the viewpoint 5.

It should be appreciated that when the stereoscopic projection system 100 includes K backlight assemblies, two paths of imaging light corresponding to one backlight assembly may carry the same image information. For example, in fig. 9, viewpoint 2 and viewpoint 3 are combined into one viewing position. Viewpoint 4 and viewpoint 5 are combined into one viewing position. The backlight assembly 901 outputs two light beams corresponding to the viewpoint 4 and the viewpoint 5. At this time, two paths of imaging light formed by two light beams output from the backlight assembly 901 may carry the same image information. The imaging light corresponding to the backlight assembly 102 and the imaging light corresponding to the backlight assembly 901 carry different image information. The imaging light corresponding to the backlight assembly 902 and the imaging light corresponding to the backlight assembly 901 carry different image information. At this time, both eyes of the user at any one of the above viewing positions can still receive the imaging light carrying different image information, thereby obtaining stereoscopic visual enjoyment.

As can be seen from the foregoing description, the stereoscopic projection system 100 may move the backlight assembly through a moving mechanism. When the stereoscopic projection system 100 includes K backlight assemblies, the moving mechanism may be used to move the K backlight assemblies. To reduce the complexity of the structure of the moving mechanism, the moving mechanism may move K backlight assemblies in the same direction. At this time, each of the K backlight assemblies has the same moving direction during the moving. For example, in fig. 9, at a certain time, the backlight assembly 102, the backlight assembly 901, and the backlight assembly 902 are simultaneously moved upward. At another time, the backlight assembly 102, the backlight assembly 901, and the backlight assembly 902 move downward at the same time.

In practical applications, a plurality of light source devices distributed in an arc shape occupy a larger space. In the embodiment of the present application, when the stereoscopic projection system 100 includes a plurality of light source devices, the plurality of light source devices may be disposed in parallel. The parallel arrangement means that the light emitting surfaces of the light source devices are in the same plane, and the light beam output directions of the first light source device and the second light source device are the same. The plane is perpendicular to the output direction.

In the previous examples of fig. 4a to 6, the optical element 302 is used to obtain the first light beam by transmitting the original light beam. From the foregoing description, the optical element 302 may also be a mirror. Thus, the optical element 302 may also be used to obtain the first light beam by reflecting the original light beam. As for the description of the optical element 302 by reflection of the first light beam, reference may be made to the description of fig. 4a to 6 above.

In practice, the distance between the user and the diffusion screen 105 may be limited by space considerations. In order that the distance between the user and the diffusion screen 105 can be reduced, the imaging light output from the diffusion screen 105 can be magnified by a curved mirror. Fig. 10 is a schematic structural diagram of a projection system according to an embodiment of the present application. As shown in fig. 10, projection system 1100 includes a stereoscopic projection system 100 and a curved mirror 1101. The stereoscopic projection system 100 is configured to output two paths of imaging light. With respect to the description of the stereoscopic projection system 100, reference may be made to the description of the stereoscopic projection system 100 in any of the foregoing figures 1-9. The curved mirror 1101 is used for reflecting two paths of imaging light, and an included angle exists between the two paths of reflected imaging light. The focal length of curved mirror 1101 is f. The diffuser screen 105 is spaced a distance d from the curved mirror 1101.

There is a vertical distance between each point on the curved mirror 1101 and the diffusion screen 105. d may be the furthest vertical distance. Alternatively, d may be the linear distance of the center point of the diffusion screen 105 from the target point on the curved mirror 1101. The imaging light output from the center point irradiates the target point on the curved mirror 1101. d is less than f. When d is smaller than f, the curved mirror 1101 can amplify the virtual image. Thus, as the distance between the user and the projection system 1100 is closer, the user may see the magnified virtual image, thereby enhancing the user experience.

Referring to fig. 11, fig. 11 is a schematic circuit diagram of a stereoscopic projection system according to an embodiment of the present application.

As shown in fig. 11, the circuits in the stereoscopic projection system mainly include a processor 1001, an internal memory 1002, an external memory interface 1003, an audio module 1004, a video module 1005, a power module 1006, a wireless communication module 1007, an i/O interface 1008, a video interface 1009, a processor local area network (Controller Area Network, CAN) transceiver 1010, a display circuit 1028, a display panel 1029, and the like. The processor 1001 and its peripheral elements, such as the internal memory 1002, the can transceiver 1010, the audio module 1004, the video module 1005, the power module 1006, the wireless communication module 1007, the i/O interface 1008, the video interface 1009, the touch unit 1010, and the display circuit 1028, may be connected through a bus. The processor 1001 may be referred to as a front-end processor.

In addition, the circuit diagrams illustrated in the embodiments of the present application do not constitute a specific limitation on stereoscopic projection systems. In other embodiments of the present application, the stereoscopic projection system may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 1001 includes one or more processing units, for example: the processor 1001 may include an application processor (Application Processor, AP), a modem processor, a graphics processor (Graphics Processing Unit, GPU), an image signal processor (Image Signal Processor, ISP), a video codec, a digital signal processor (Digital Signal Processor, DSP), a baseband processor, and/or a Neural network processor (Neural-Network Processing Unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

A memory may also be provided in the processor 1001 for storing instructions and data. For example, an operating system for a stereoscopic projection system, an AR Creator software package, etc. In some embodiments, the memory in the processor 1001 is a cache memory. The memory may hold instructions or data that the processor 1001 has just used or recycled. If the processor 1001 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 1001 is reduced, thus improving the efficiency of the system.

In addition, if the stereoscopic projection system in the present embodiment is mounted on a vehicle, the functions of the processor 1001 may be implemented by a domain processor on the vehicle.

In some embodiments, the stereoscopic projection system may also include a plurality of Input/Output (I/O) interfaces 1008 coupled to the processor 1001. The interface 1008 may include, but is not limited to, an integrated circuit (Inter-Integrated Circuit, I2C) interface, an integrated circuit built-in audio (Inter-Integrated Circuit Sound, I2S) interface, a pulse code modulation (Pulse Code Modulation, PCM) interface, a universal asynchronous receiver Transmitter (Universal Asynchronous Receiver/Transmitter, UART) interface, a mobile industry processor interface (Mobile Industry Processor Interface, MIPI), a General-Purpose Input/Output (GPIO) interface, a subscriber identity module (Subscriber Identity Module, SIM) interface, and/or a universal serial bus (Universal Serial Bus, USB) interface, among others. The I/O interface 1008 may be connected to a mouse, a touch screen, a keyboard, a camera, a speaker/horn, a microphone, or a physical key (e.g., a volume key, a brightness adjustment key, an on/off key, etc.) on the stereoscopic projection system.

The internal memory 1002 may be used to store computer-executable program code that includes instructions. The internal memory 1002 may include a stored program area and a stored data area. The storage program area may store an application program (such as a call function, a time setting function, an AR function, etc.) required for at least one function of the operating system, etc. The storage data area may store data created during use of the stereoscopic projection system (e.g., phone book, world time, etc.), etc. In addition, the internal memory 1002 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, universal flash memory (Universal Flash Storage, UFS), and the like. The processor 1001 performs various functional applications of the stereoscopic projection system and data processing by executing instructions stored in the internal memory 1002 and/or instructions stored in a memory provided in the processor 1001.

The external memory interface 1003 may be used to connect to an external memory (for example, micro SD card), and the external memory may store data or program instructions as needed, and the processor 1001 may perform operations such as reading and writing on these data or program execution through the external memory interface 1003.

The audio module 1004 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 1004 may also be used to encode and decode audio signals, such as for playback or recording. In some embodiments, the audio module 1004 may be provided in the processor 1001, or a part of functional modules of the audio module 1004 may be provided in the processor 1001. The stereoscopic projection system may implement audio functions through an audio module 1004, an application processor, and the like.

The video interface 1009 may receive externally input audio and video, which may specifically be a high-definition multimedia interface (High Definition Multimedia Interface, HDMI), a digital video interface (Digital Visual Interface, DVI), a video graphics array (Video Graphics Array, VGA), a Display Port (DP), a low voltage differential signaling (Low Voltage Differential Signaling, LVDS) interface, and the like, and the video interface 1009 may further output video. For example, the stereoscopic projection system receives video data transmitted by the navigation system or video data transmitted by the domain processor through the video interface.

The video module 1005 may decode the video input by the video interface 1009, for example, h.264 decoding. The video module can also encode the video collected by the stereoscopic projection system, for example, H.264 encodes the video collected by an external camera. The processor 1001 may decode the video input from the video interface 1009 and output the decoded image signal to the display circuit.

Further, the stereoscopic projection system further includes a CAN transceiver 1010, and the CAN transceiver 1010 may be connected to a CAN BUS (CAN BUS) of the automobile. Through the CAN bus, the stereoscopic projection system CAN communicate with a vehicle entertainment system (music, radio, video module), a vehicle state system, and the like. For example, the user may turn on the in-vehicle music play function by operating the stereoscopic projection system. The vehicle status system may send vehicle status information (doors, belts, etc.) to the stereoscopic projection system for display.

The display circuit 1028 and the display panel 1029 realize a function of displaying an image together. The display circuit 1028 receives the image signal output from the processor 1001, processes the image signal, and inputs the processed image signal to the display panel 1029 for imaging. The display circuit 1028 can also control an image displayed on the display panel 1029. For example, parameters such as display brightness or contrast are controlled. The display circuit 1028 may include a driving circuit, an image control circuit, and the like. Wherein the display circuit 1028 and the display panel 1029 may be located in the pixel assembly 502.

The display panel 1029 is used to modulate the light beam input from the light source according to the input image signal, thereby generating a visual image. The display panel 1029 may be a liquid crystal on silicon panel, a liquid crystal display panel, or a digital micromirror device.

In this embodiment, the video interface 1009 may receive input video data (or referred to as a video source), the video module 1005 decodes and/or digitizes the input video data and outputs an image signal to the display circuit 1028, and the display circuit 1028 drives the display panel 1029 to image a light beam emitted by the light source according to the input image signal, so as to generate a visual image (emit imaging light).

The power module 1006 is configured to provide power to the processor 1001 and the light source based on input power (e.g., direct current), and the power module 1006 may include a rechargeable battery that may provide power to the processor 1001 and the light source. Light emitted from the light source may be transmitted to the display panel 1029 for imaging, thereby forming an image light signal (imaging light).

In addition, the power module 1006 may be connected to a power module (e.g., a power battery) of the vehicle, and the power module 1006 of the stereoscopic projection system may be powered by the power module of the vehicle.

The wireless communication module 1007 may enable the stereoscopic projection system to communicate wirelessly with the outside world, which may provide solutions for wireless communication such as wireless local area network (Wireless Local Area Networks, WLAN) (e.g., wireless fidelity (Wireless Fidelity, wi-Fi) network), bluetooth (BT), global navigation satellite system (Global Navigation Satellite System, GNSS), frequency modulation (Frequency Modulation, FM), near field wireless communication technology (Near Field Communication, NFC), infrared technology (IR), etc. The wireless communication module 1007 may be one or more devices that integrate at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via an antenna, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 1001. The wireless communication module 1007 may also receive signals to be transmitted from the processor 1001, frequency modulate them, amplify them, and convert them to electromagnetic waves for radiation via an antenna.

In addition, the video data decoded by the video module 1005 may be received wirelessly by the wireless communication module 1007 or read from the internal memory 1002 or the external memory, for example, the stereoscopic projection system may receive video data from a terminal device or an in-vehicle entertainment system through a wireless local area network in the vehicle, and the stereoscopic projection system may also read audio/video data stored in the internal memory 1002 or the external memory.

The embodiment of the application also provides a vehicle, and the vehicle is provided with any one of the stereoscopic projection systems. The stereoscopic projection system is used for outputting two paths of imaging light. The two paths of imaging light carry image information of different parallaxes. The two paths of imaging light are reflected to the windshield through the reflecting mirror, and the windshield further reflects the two paths of imaging light to form a virtual image. The virtual image is located on one side of the windshield and the driver or passenger is located on the other side of the windshield. The reflected two paths of imaging light are respectively irradiated to both eyes of the driver or the passenger. For example, the first imaging light irradiates the left eye of the passenger. The second imaging light irradiates the right eye of the passenger.

The embodiment of the application also provides a vehicle, and the vehicle is provided with the projection system in the figure 10. Fig. 12 is a schematic view of a projection system according to an embodiment of the present application mounted on a vehicle. The windshield of the vehicle may act as a curved mirror in the projection system. The stereoscopic projection system 100 of the projection systems is located on the same side of the windshield. The stereoscopic projection system 100 is configured to output two paths of imaging light. The two paths of imaging light carry image information of different parallaxes. The windshield is used to reflect the two paths of imaging light to form a virtual image. The virtual image is located on one side of the windshield and the driver or passenger is located on the other side of the windshield. The reflected two paths of imaging light are respectively irradiated to both eyes of the driver or the passenger. For example, the first imaging light irradiates the left eye of the passenger. The second imaging light irradiates the right eye of the passenger.

By way of example, the vehicle may be a car, truck, motorcycle, bus, boat, airplane, helicopter, mower, recreational vehicle, casino vehicle, construction equipment, electric car, golf cart, train, trolley, etc., and embodiments of the present application are not particularly limited. The stereoscopic projection system can be installed on an Instrument Panel (IP) platform of a vehicle, located in a secondary driving position or a primary driving position, and also can be installed on the back of a seat. When the stereoscopic projection system is applied to a vehicle, it may be called Head Up Display (HUD), and may be used to Display navigation information, vehicle speed, electric quantity/oil quantity, and the like.

As shown in fig. 13, various subsystems may be included in the functional framework of the vehicle, such as a control system 14, a sensor system 12, one or more peripheral devices 16 (one shown in the illustration), a power supply 18, a computer system 20, a display system 32, as shown. Alternatively, the vehicle may also include other functional systems, such as an engine system to power the vehicle, etc., as not limited herein.

The sensor system 12 may include a plurality of sensing devices that sense the measured information and convert the sensed information to an electrical signal or other desired form of information output according to a certain rule. As illustrated, these detection devices may include, without limitation, a global positioning system (global positioning system, GPS), a vehicle speed sensor, an inertial measurement unit (inertial measurement unit, IMU), a radar unit, a laser rangefinder, an imaging device, a wheel speed sensor, a steering sensor, a gear sensor, or other elements for automatic detection, and so forth.

The control system 14 may include several elements such as a steering unit, a braking unit, a lighting system, an autopilot system, a map navigation system, a network timing system, and an obstacle avoidance system as shown. Optionally, control system 14 may also include elements such as a throttle processor and an engine processor for controlling the speed of travel of the vehicle, as not limited in this application.

Peripheral device 16 may include several elements such as the communication system in the illustration, a touch screen, a user interface, a microphone, and a speaker, among others. Wherein the communication system is used for realizing network communication between the vehicle and other devices except the vehicle. In practical applications, the communication system may employ wireless communication technology or wired communication technology to enable network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through a network cable or an optical fiber, etc.

The power source 18 represents a system that provides power or energy to the vehicle, which may include, but is not limited to, a rechargeable lithium battery or lead acid battery, or the like. In practical applications, one or more battery packs in the power supply are used to provide electrical energy or power for vehicle start-up, and the type and materials of the power supply are not limited in this application.

Several functions of the vehicle are performed by the control of the computer system 20. The computer system 20 may include one or more processors 2001 (shown as one processor) and memory 2002 (which may also be referred to as storage devices). In practical applications, the memory 2002 is also internal to the computer system 20, or external to the computer system 20, for example, as a cache in a vehicle, and the present application is not limited thereto. Wherein,

for a description of the processor 2001, reference may be made to the description of the processor 1001 previously described. The processor 2001 may include one or more general-purpose processors, e.g., a graphics processor (graphic processing unit, GPU). The processor 2001 may be used to execute related programs or instructions corresponding to the programs stored in the memory 2002 to implement the corresponding functions of the vehicle.

Memory 2002 may include volatile memory (RAM), for example; the memory may also include a non-volatile memory (ROM), flash memory (flash memory), or solid state disk (solid state drives, SSD); memory 2002 may also include combinations of the above types of memory. Memory 2002 may be used to store a set of program codes or instructions corresponding to the program codes so that processor 2001 invokes the program codes or instructions stored in memory 2002 to implement the corresponding functions of the vehicle. Including but not limited to some or all of the functions in the vehicle function frame schematic shown in fig. 13. In this application, the memory 2002 may store a set of program codes for vehicle control, which the processor 2001 invokes to control the safe driving of the vehicle, as to how the safe driving of the vehicle is achieved, as described in detail below.

Alternatively, the memory 2002 may store information such as road maps, driving routes, sensor data, and the like, in addition to program codes or instructions. The computer system 20 may implement the relevant functions of the vehicle in combination with other elements in the functional framework schematic of the vehicle, such as sensors in the sensor system, GPS, etc. For example, the computer system 20 may control the direction of travel or speed of travel of the vehicle, etc., based on data input from the sensor system 12, without limitation.

The display system 32 may include several elements, such as a processor, curved mirrors, and the stereoscopic projection system 100 described previously. The processor is configured to generate an image (e.g., an image including vehicle conditions such as vehicle speed, amount of electricity/oil, etc., and an image of augmented reality AR content) according to a user instruction and transmit the image content to the stereoscopic projection system 100. The stereoscopic projection system 100 is configured to output two paths of imaging light carrying different image information. The windshield is a curved mirror. The windshield is used to reflect or transmit two paths of imaging light so that a virtual image corresponding to the image content is presented in front of the driver or passenger. It should be noted that the functions of some of the elements in the display system 32 may be implemented by other subsystems of the vehicle, for example, the processor may be an element in the control system 14.

Herein, fig. 13 illustrates four subsystems, including the sensor system 12, the control system 14, the computer system 20, and the display system 32, which are only examples, and not limiting. In practical applications, the vehicle may combine several elements in the vehicle according to different functions, thereby obtaining subsystems with corresponding different functions. In practice, the vehicle may include more or fewer systems or elements, and the present application is not limited thereto.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A stereoscopic projection system comprising a backlight assembly, a spatial light modulator, and a diffuser screen, wherein:

the backlight assembly includes a light source device and an optical element;

The light source device is used for outputting a first original light beam at a third position, moving from the third position to a fourth position through a first path and outputting a second original light beam at the fourth position;

the optical element is used for obtaining a first light beam at a first position according to the first original light beam, moving the first light beam from the first position to a second position through a second path, changing the transmission direction of the second original light beam at the second position to obtain a second light beam, and outputting two light beams to the spatial light modulator at different angles in a time-sharing mode, wherein the two light beams comprise the first light beam and the second light beam, the third position and the fourth position are located on a first plane, the first position and the second position are located on a second plane, the first plane and the second plane are parallel, the first path and the second path are parallel, and the length of the second path is smaller than that of the first path;

the spatial light modulator is used for modulating the two light beams in a time-sharing mode according to different image information to obtain two paths of imaging light, and outputting the two paths of imaging light to the diffusion screen at different angles;

The diffusion screen is used for diffusing the two paths of imaging light and outputting the diffused two paths of imaging light at different angles, and the two paths of imaging light correspond to one viewing position.

2. The stereoscopic projection system of claim 1, wherein the image of the object is projected onto the object,

the optical element is further configured to change a divergence angle of the second original beam at the second location to obtain the second beam.

3. The stereoscopic projection system according to claim 2, wherein,

the optical element is further configured to change a divergence angle of the second original beam at the second location, the obtaining the second beam comprising: the optical element is used for increasing the diffusion angle of the second original light beam to obtain the second light beam.

4. A stereoscopic projection system according to any one of claims 1 to 3, wherein the optical element is a variable focus device.

5. A stereoscopic projection system according to any one of claims 1 to 3,

the backlight assembly for outputting two light beams to the spatial light modulator at different angles in a time-sharing manner includes: the backlight assembly is used for moving among M positions and outputting M light beams at different angles, the M light beams comprise the two light beams, the M positions comprise the first position and the second position, the M positions and the M light beams are in one-to-one correspondence, and M is an integer greater than 1.

6. The stereoscopic projection system of claim 5, further comprising a human eye tracking module;

the eye tracking module is used for acquiring M viewpoints, and the M viewpoints are in one-to-one correspondence with the M positions;

the backlight assembly for moving between M positions includes: the backlight assembly is for moving between the M positions of the N positions according to the M viewpoints.

7. The stereoscopic projection system of claim 6, wherein N ranges from 2 to 10.

8. The stereoscopic projection system according to any one of claims 1 to 7, wherein,

the stereoscopic projection system includes a backlight assembly and a spatial light modulator including: the stereoscopic projection system comprises K backlight assemblies and the spatial light modulator, wherein K is an integer greater than 1;

each of the K backlight assemblies is configured to output two light beams to the spatial light modulator at different angles, resulting in 2×k light beams;

the spatial light modulator is used for modulating the two light beams in a time-sharing mode according to different image information to obtain two paths of imaging light, and outputting the two paths of imaging light to the diffusion screen at different angles comprises the following steps: the spatial light modulator is used for modulating the 2 XK beams to obtain 2 XK imaging light, and outputting the 2 XK imaging light to the diffusion screen at different angles.

9. The stereoscopic projection system of claim 8, wherein each of the K backlight assemblies has the same moving direction during movement.

10. A projection system comprising a curved mirror and a stereoscopic projection system according to any one of the preceding claims 1 to 9;

the stereoscopic projection system is used for outputting two paths of imaging light;

the curved mirror is used for reflecting the two paths of diffused imaging light, an included angle exists between the two paths of reflected imaging light, the focal length of the curved mirror is f, the distance between the diffusion screen and the curved mirror is d, and the d is smaller than the f.

11. A vehicle comprising the stereoscopic projection system of any one of claims 1 to 9 or the projection system of claim 10, said stereoscopic projection system or said projection system being mounted on said vehicle.