CN115629515A - Stereoscopic projection system, projection system and vehicle - Google Patents

Abstract

The application provides a stereoscopic projection system which is applied to the field of display. The stereoscopic projection system includes a backlight assembly, a spatial light modulator, and a diffusion 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 the 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 two paths of diffused imaging light at different angles. In the present application, the cost of the stereoscopic projection system can be reduced by sharing the same spatial light modulator.

Description

Stereoscopic projection system, projection system and vehicle

This application is a divisional application, the application number of the original application is 202210892822.X, and the original application date is July 27, 2022. The entire content of the original application is incorporated in this application by reference.

technical field

The present application relates to the field of display, in particular to a stereoscopic projection system and a vehicle including the stereoscopic projection system.

Background technique

Stereoscopic display needs to provide image information with different parallax to both eyes. Compared with 2D display, stereoscopic display can give people a better experience.

Glasses-free stereoscopic display technology is also a stereoscopic display solution, in which users do 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, the stereoscopic projection system includes 2 projectors and a diffusion screen. Two projectors are used to output two paths of imaging light to the diffusion screen in different output directions. The diffusion screen is used to diffuse the two paths of imaging light, and output the two paths of imaging light at different angles. Two paths of imaging light output by the diffusion screen are irradiated to the left and right eyes of the user respectively. The two imaging lights carry different image information. So as to provide users with three-dimensional visual enjoyment.

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

Contents of the invention

The present application provides a stereoscopic projection system, a projection system and a vehicle, and the cost of the stereoscopic projection system can be reduced by sharing the same spatial light modulator.

The 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 to modulate two light beams according to different image information to obtain two paths of imaging light. The spatial light modulator is used to output two paths of imaging light to the diffusion screen at different angles. The diffusion screen is used to diffuse the two paths of imaging light, and output the diffused two paths of imaging light at different angles.

In an optional manner of the first aspect, the backlight assembly includes a first light source device and a second light source device. The two beams include a first beam and a second beam. The first light source device and the second light source device are used to output the first light beam and the second light beam in time division. 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, which can reduce the complexity of the structure of the backlight assembly, thereby reducing the production cost.

In an optional manner of the first aspect, the two light beams include a first light beam and a second light beam. The backlight assembly is used for outputting the first light beam at the first position, and outputting the second light beam at the second position. In this 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 optional manner 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 remains unchanged. The light source device is used to output the original light beam. The optical element is used to obtain the first light beam according to the original light beam at the first position. The optical element is used to change the transmission direction of the original light beam at the second position to obtain the second light beam. In this application, the optical element is moved by a moving mechanism. By moving the optical element and fixing the light source device, the complexity of the moving mechanism can be reduced, thereby reducing the cost of the moving mechanism.

In an optional manner of the first aspect, there is an overlapping area between the first light beam and the second light beam output by the optical element. Spatial light modulators are located in the overlapping region. When the spatial light modulator is located in the overlapping area, the stereoscopic projection system may not need to move the spatial light modulator, thereby reducing the cost of the stereoscopic projection system.

In an optional manner of the first aspect, the backlight assembly includes a light source device and an optical element. The light source device is used to output the first original light beam at the third position. The optical element is used to obtain the first light beam according to the first original light beam at the first position. The light source device is used to output the second original light beam at the fourth position. The optical element is used to change the transmission direction of the second original light beam at the second position to obtain the second light beam. Wherein, the offset between the third position and the first position is different from the offset between the fourth position and the second position. By moving the optical element and the light source device, the irradiated areas of the first light beam and the second light beam can overlap as much as possible. When the spatial light modulators are located in the overlapping area, the waste of light beams can be reduced. Therefore, the present application can improve the utilization rate of light beams.

In an optional manner of the first aspect, the third position and the fourth position are located on the first plane. The light source device is used to move from the third position to the 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. Compared with moving the light source device in a curve, moving the light source device in a straight line can reduce the complexity of the moving mechanism and reduce the demand for moving space. Therefore, the present application can reduce the cost of the stereoscopic projection system and improve user experience.

In an optional manner of the first aspect, the first position and the second position are located on 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. Compared with moving the optical element in a curve, moving the optical element in a straight line can reduce the complexity of the moving mechanism and reduce the demand for moving space. Therefore, the present application can reduce the cost of the stereoscopic projection system and improve user experience.

In an optional manner 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 shorter than the length of the first path, the irradiation areas of the two light beams may overlap as much as possible. When the spatial light modulators are located in the overlapping area, the wastage of light beams is reduced. Therefore, the present application can improve the utilization rate of light beams.

In an optional manner of the first aspect, the optical element is further configured to change the divergence angle of the second original light beam at the second position to obtain the second light beam.

In an optional manner of the first aspect, the optical element is used to increase the divergence angle of the second original light beam to obtain the second light beam. By increasing the divergence angle of the original light beam, the distance between the light source device and the spatial light modulator can be reduced. Therefore, the present application can reduce the size of the stereoscopic projection system, thereby improving user experience.

In an optional manner 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, thereby improving user experience.

In an optional manner of the first aspect, the backlight assembly is used to move among M positions and output M light beams at different angles. The M beams include two beams. The M locations include a first location and a second location. There is a one-to-one correspondence between the M positions and the M beams. M is an integer greater than 1. By moving between M positions, the number of backlight assemblies can be reduced while providing more viewing positions. Therefore, the present application can reduce the cost of the stereoscopic projection system.

In an optional manner of the first aspect, the stereoscopic projection system further includes a human eye tracking module. The human eye tracking module is used to acquire M viewpoints. There is a one-to-one correspondence between M viewpoints and M positions. The backlight assembly is used to move between M of the N positions according to the M viewpoints. N positions correspond to N viewpoints. Among the N viewpoints, only M viewpoints may be watched by the user. By only moving between M positions, the image frame rate of a single user can be increased. Therefore, the present application can improve user experience.

In an optional manner of the first aspect, N ranges from 2 to 10. When the value of N is too large, the image frame rate of a single user will be reduced. Therefore, the present application can improve the image frame rate of a single user by limiting the value of N, thereby improving user experience.

In an optional manner 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 used to output two light beams to the spatial light modulator at different angles to obtain 2×K light beams. The spatial light modulator is used to modulate 2×K light beams to obtain 2×K imaging lights. The spatial light modulator is used to output 2×K paths of imaging light to the diffusion screen at different angles. 2×K beams include two beams. The 2×K channels of imaging light include two beams of imaging light. In this application, more viewing positions can be provided by introducing K backlight assemblies. Therefore, the present application can improve user experience.

In an optional manner of the first aspect, each of the K backlight assemblies moves in the same direction during the movement. 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 optional manner of the first aspect, when the backlight assembly moves from the first position to the second position, or from the second position to the first position, the backlight assembly does not output light beams. The beam output during the movement may cause crosstalk, which affects the user experience. Therefore, the present application can improve user experience.

The second aspect of the present application provides a projection system. The projection system includes a curved mirror and the stereoscopic projection system described in the foregoing first aspect or any optional manner of the first aspect. The stereoscopic projection system is used to output two-way imaging light. The curved mirror is used to reflect the diffused two-way imaging light, and there is an angle between the reflected two-way imaging light. The focal length of a curved mirror is f. The distance between the diffuser screen and the curved mirror is d. d is less than f. The two-way imaging light can be amplified by the curved mirror, thereby reducing the distance between the user and the diffusion screen. Therefore, the present application can improve user experience.

The third aspect of the present application provides a vehicle. The vehicle includes the stereoscopic projection system described in the foregoing first aspect or any optional manner of the first aspect, or the projection system described in the foregoing second aspect. Stereoscopic projection systems or projection systems are mounted on vehicles.

Description of drawings

FIG. 1 is a first structural schematic diagram of a stereoscopic projection system provided by an embodiment of the present application;

FIG. 2 is a first structural schematic diagram of a display device provided by an embodiment of the present application;

FIG. 3 is a second structural schematic diagram of a display device provided by an embodiment of the present application;

FIG. 4a is a third structural schematic diagram of a display device provided by an embodiment of the present application;

FIG. 4b is a fourth structural schematic diagram of a display device provided by an embodiment of the present application;

Fig. 4c is a fifth structural schematic diagram of the display device provided by the embodiment of the present application;

FIG. 5 is a sixth structural schematic diagram of a display device provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a backlight assembly provided by an embodiment of the present application;

FIG. 7 is a second structural schematic diagram of the stereoscopic projection system provided by the embodiment of the present application;

FIG. 8 is a third structural schematic diagram of the stereoscopic projection system provided by the embodiment of the present application;

FIG. 9 is a fourth structural schematic diagram of the stereoscopic projection system provided by the embodiment of the present application;

FIG. 10 is a schematic structural diagram of a projection system provided by an embodiment of the present application;

FIG. 11 is a schematic circuit diagram of a stereoscopic projection system provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of a projection system installed in a vehicle according to an embodiment of the present application;

Fig. 13 is a schematic diagram of a possible functional framework of a vehicle provided by an embodiment of the present application.

Detailed ways

The present application provides a stereoscopic projection system, a projection system and a vehicle, and the cost of the stereoscopic projection system can be reduced by sharing the same spatial light modulator. It should be understood that "first", "second" and the like used in the present application are only used for the purpose of distinguishing and describing, and cannot be interpreted as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, for the sake of brevity and clarity, reference numbers and/or letters are repeated in multiple drawings of the embodiments of the present application. Repetition does not imply a strictly limited 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 in this application is applied in the field of display. In the field of display, a stereoscopic projection system can be used to provide users with stereoscopic visual enjoyment. However, the stereoscopic projection system includes 2 projectors, and each projector includes 1 spatial light modulator, resulting in high cost of the stereoscopic projection system.

To this end, the present application provides a stereoscopic projection system. FIG. 1 is a first structural schematic diagram of a stereoscopic projection system provided by an embodiment of the present application. As shown in FIG. 1 , a 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 time division. The spatial light modulator 103 may be a liquid crystal display (liquid crystal display, LCD), a liquid crystal on silicon (liquid crystal on silicon, LCOS), or a digital micro-mirror device (digital micro-mirror device, DMD), etc. The spatial light modulator 103 is used to time-divisionally modulate two light beams according to different image information to obtain two paths of imaging light. For example, at the first moment, the spatial light modulator 103 is configured to modulate the first light beam according to the first image information to obtain the 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 to obtain a second path of imaging light. In FIG. 1 , the solid line with arrows represents the first light beam and the first path of imaging light, and the dotted line with arrows represents the second light beam and the second path of imaging light.

The spatial light modulator 103 is used to output two paths of imaging light to the lens 104 at different angles. The lens 104 is used to change the transmission direction of the two imaging lights, and transmit the two transmission lights to the diffusion screen 105 . The diffusion screen 105 is used to diffuse the two paths of imaging light, and output the diffused two paths of imaging light at different angles. The diffused two-way imaging light is irradiated to different viewpoints, such as the user's left and right eyes. The two imaging lights carry different image information. When the two imaging lights are irradiated to the left and right eyes of the user respectively, it can provide the user with a three-dimensional visual enjoyment.

In the embodiment of the present application, by sharing the same spatial light modulator 103, the spatial light modulator 103 can time-divisionally output two channels of imaging light, thereby providing users with stereoscopic visual enjoyment. Therefore, the embodiment of the present application can reduce the number of spatial light modulators 103 in the stereoscopic projection system, thereby reducing the cost of the stereoscopic projection system.

According to the foregoing description of FIG. 1 , the backlight assembly 102 can output two light beams. The directions of propagation of the two beams are different. A possible structure of the backlight assembly 102 is described exemplarily below.

In one example, the backlight assembly 102 includes a plurality of light source devices. Multiple light source devices output two light beams in time division. FIG. 2 is a first structural schematic diagram of a display device provided by 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 light source device 201 and the second light source device 202 may be a light emitting diode (light emitting diode, LED) light source or a laser diode (laser diode, LD) light source or the like. The first light source device 201 and the second light source device 202 are used to output two light beams in time division. For example, at a first moment, the first light source device 201 is used to output a first light beam to the spatial light modulator 103 . At a second moment, the second light source device 202 is used to output the second light beam to the spatial light modulator 103 . The spatial light modulator 103 is used to time-divisionally modulate two light beams according to different image information to obtain two paths of imaging light.

In another example, by moving the backlight assembly 102, the backlight assembly 102 outputs two light beams respectively at different positions. FIG. 3 is a second structural schematic diagram of a display device provided by 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 a position A and a position B. As shown in FIG. At the first moment, the backlight assembly 102 is used to output the first light beam to the spatial light modulator 103 at position A. At the second moment, the backlight assembly 102 is used to output the second light beam to the spatial light modulator 103 at the position B. The spatial light modulator 103 is used to time-divisionally modulate two light beams according to different image information to obtain two paths of imaging light.

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

Fig. 4a is a third structural schematic diagram of a display device provided by an embodiment of the present application. As shown in FIG. 4 a , a 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 used to output the original light beam to the optical element 302 . The optical element 302 may be a lens, a reflector, a prism or a Fresnel mirror and the like. The optical element 302 is used to obtain the first light beam according to the original light beam at the 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 of the light source device 301 coincides with the X axis. The optical axis of the optical element 302 coincides with the X axis. Therefore, the chief 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 angle α between the chief ray and the receiving surface 303 is 90°. The display device 101 in this application utilizes the eccentricity of the chief ray of the light source device 301 and the optical axis of the optical element 302 (the chief ray of the light source device 301 and the optical axis of the optical element 302 deviate up and down), and changes the distance between the chief ray of the original light beam. angle, so that the optical element 302 outputs the second light beams with different transmission directions.

FIG. 4b is a fourth schematic structural diagram of a display device provided by an embodiment of the present application. As shown in FIG. 4b, on the basis of FIG. 4a, the optical element 302 is translated upward. At this time, in FIG. 4 b , the chief ray of the light source device 301 coincides with the X axis. Optical axis 304 of optical element 302 is parallel to the X axis. The optical axis 304 of the optical element 302 deviates upward relative to the chief ray of the light source device 301 . Therefore, the optical element 302 will change the angle of the chief ray of the original light beam (that is, change the transmission direction of the original light beam) to obtain the second light beam. In Fig. 4b, the angle of the chief ray of the second beam is shifted upwards. The angle of upward deviation will cause the irradiation range of the light beam on the receiving surface 303 to move upward. The included angle β between the principal ray of the second light beam and the receiving surface 303 is greater than 90°.

FIG. 4c is a fifth structural schematic diagram of a display device provided by an embodiment of the present application. As shown in FIG. 4c, on the basis of FIG. 4a, the optical element 302 is translated downward. At this time, in FIG. 4c, the chief ray of the light source device 301 coincides with the X axis. Optical axis 304 of optical element 302 is parallel to the X axis. The optical axis 304 of the optical element 302 deviates downward relative to the chief ray of the light source device 301 . Therefore, the optical element 302 will change the angle of the chief ray of the original light beam (that is, change the transmission direction of the original light beam) to obtain the second light beam. In Fig. 4c, the angle of the chief ray of the second beam is shifted downwards. The downward offset angle will cause the irradiation range of the light beam on the receiving surface 303 to move downward. The included angle β between the chief ray of the second light beam and the receiving surface 303 is less than 90°.

The position of the optical element 302 in FIG. 4a is called the first position, and the position of the optical element 302 in FIG. 4b or 4c is called the second position. The time when the optical element 302 stays at the first position is called the first moment. The time when the optical element 302 stays at the second position is called the second moment. At a first moment, the optical element 302 outputs a first light beam at a first position. At a second moment, the optical element 302 outputs a second light beam at a second position. The first light beam and the second light beam output by the optical element 302 are time-divisionally irradiated 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 spatial light modulator 103 may be disposed in the overlapping area.

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

According to the foregoing descriptions of FIG. 4 a , FIG. 4 b and FIG. 4 c , by changing the position of the optical element 302 , the irradiation range of the light beam on the receiving surface 303 will be 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 will be energy waste of 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 overlap as much as possible by moving the light source device 301 .

FIG. 5 is a sixth schematic structural diagram of a display device provided by 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 figure). 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 position A and position B through the moving mechanism.

At the position A, the light source device 301 is located at the third position, and the optical element 302 is located at the first position. At the first moment, the light source device 301 is used to output the first original light beam. The optical element 302 is used to obtain the first light beam according to the first original light beam. At the position A, the optical axis of the optical element 302 deviates downward relative to the chief ray of the light source device 301 . Consequently, the angle of the chief ray of the first light beam (indicated by the dotted line connected to the light source device 301 at position A) is shifted downwards. The optical element 302 is used to change the transmission direction of the first original light beam to obtain the first light beam.

In the position B, the light source device 301 is located in the fourth position, and the optical element 302 is located in the second position. At the second moment, the light source device 301 is used to output the second original light beam. The optical element 302 is used to obtain a second light beam according to the second original light beam. At the position B, the optical axis of the optical element 302 deviates upward relative to the chief ray of the light source device 301 . Consequently, the angle of the chief ray of the second light beam (indicated by the dashed line connected to the light source device 301 at position B) is shifted upwards. The optical element 302 is used to change the transmission direction of the second original light beam to obtain the second light beam.

For the description of the spatial light modulator 103 , reference may be made to the description in any one of the aforementioned FIGS. 1 to 4c. When the chief ray of the first light beam and the chief ray of the second light beam coincide on the receiving surface 303 , the irradiation ranges of the first light beam and the second light beam on the receiving surface 303 coincide. Moreover, the size of the irradiation range of the first light beam and the second light beam on the receiving surface 303 may be as equal as possible to the size of the spatial light modulator 103 . Therefore, the embodiment of the present 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. In position B, the optical element 302 needs to shift the angle of the chief ray upward. Therefore, the relative position of the third position and the first position is different from the relative position of the fourth position and the second position, that is, the offset amount of the third position and the first position is different from the offset amount of the fourth position and the second position .

According to the descriptions in FIGS. 3 to 5 , it can be known that the embodiment of the present application needs to move 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 moving 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 demand for moving space, the moving mechanism can move the optical element 302 and/or the light source device 301 in a straight line.

FIG. 6 is a schematic structural diagram of a backlight assembly provided by 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 position A to position B. As shown in FIG. Wherein, the light source device 301 is used to move from the third position to the fourth position via the first path. The fourth position and the third position are located on the first plane 601 . The first path is parallel to the first straight line. The first straight line is located on the first plane 601 . The length of the first path is d1. 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 are located on the second plane 602 . The second path is parallel to the second straight line. The second straight line is located on the second plane 602 . The length of the second path is d2. In order to make the irradiation ranges of the first light beam and the second light beam coincide as much as possible on the receiving surface 303 , 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 chief ray of the light source device 301 .

In the foregoing FIGS. 5 and 6 , the movement of the backlight assembly 102 from the position A to the position B is described. It should be understood that in practical applications, in order to provide a stable stereoscopic viewing experience, the backlight assembly 102 needs to frequently move between the position A and the position B. Therefore, for the description about the movement of the backlight assembly 102 from the position B to the position A, reference may be made to the relevant description in FIG. 5 or FIG. 6 . If the backlight assembly 102 outputs light beams during the movement, it may cause crosstalk, thereby affecting user experience. For this reason, during the moving process, the backlight assembly 102 may not output light beams.

In the foregoing descriptions of FIGS. 4 a to 4 c , FIG. 5 and FIG. 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 practical applications, the optical element 302 can also be used to change the divergence angle of the original light beam to obtain the first light beam and/or the second light beam. For example, in FIG. 5 , at position A, the optical element 302 is used to increase the divergence angle of the first original light beam to obtain the first light beam. At position B, the optical element 302 is used to increase the divergence angle of the second original light beam to obtain a second light beam. By increasing the divergence 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 present application can reduce the size of the stereoscopic projection system, thereby improving user experience.

In the foregoing description of FIGS. 5 and 6 , the backlight assembly 102 is used to move between position A and position B. Referring to FIG. In practical applications, the backlight assembly 102 can be used to move among M positions. The backlight assembly 102 is used to output M light beams at different angles. The M beams include a first beam and a second beam. The M locations include a first location and a second location. There is a one-to-one correspondence between the M positions and the M beams. M is an integer greater than 1. In the following, M is equal to 3 as an example for description.

FIG. 7 is a second structural schematic diagram of the stereoscopic projection system provided by the 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 can be moved among position A, position B and position C through the moving mechanism.

For descriptions at position A and position B, reference may be made to the relevant description in the foregoing FIG. 5 . At position C, the light source device 301 is located at the fifth position, and the optical element 302 is located at the sixth position. At a third moment, the light source device 301 is configured to output a third original light beam. The optical element 302 is used to obtain a third light beam according to the third original light beam. The spatial light modulator 103 is used to modulate the first light beam, the second light beam and the third light beam to obtain three paths of imaging light. The lens 104 is used to change the transmission direction of the three-way imaging light. Three-way imaging light is irradiated to three viewpoints. The three-way imaging light corresponds to the three viewpoints one by one. The three viewpoints include viewpoint 1, viewpoint 2 and viewpoint 3.

In the aforementioned FIG. 7 , M is equal to 3 as an example for description. In practical applications, M can also be other values, for example, M is equal to 4, 6 or 8, and so on. More viewing positions can be provided by moving between M positions. 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 viewpoints among the M viewpoints correspond to one viewing position. For example, viewpoint 1 corresponds to the user's left eye, and viewpoint 2 corresponds to the user's right eye. Viewpoint 1 and Viewpoint 2 correspond to viewing position 1. For another example, viewpoint 2 corresponds to the user's left eye, and viewpoint 3 corresponds to the user's right eye. Viewpoint 2 and Viewpoint 3 correspond to viewing position 2.

In practical applications, only M viewpoints among the N viewpoints may be watched by the user. By only moving between M positions, the image frame rate of a single user can be increased. Therefore, to improve user experience, the backlight assembly 102 can move between M positions among the N positions. N positions to N viewpoints. At this time, the stereoscopic projection system 100 may further include a human eye tracking module and a processor. The human eye tracking module is used to acquire M viewpoints, for example coordinates of M viewpoints. There is a one-to-one correspondence between M viewpoints and M positions. The processor is used for controlling the backlight assembly to move among M positions among the N positions according to the M viewpoints. In the following, N is equal to 3 and M is equal to 2 as an example for description.

FIG. 8 is a third structural schematic diagram of the stereoscopic projection system provided by the embodiment of the present application. As shown in FIG. 8 , on the basis of FIG. 7 , the stereoscopic projection system 100 further includes a human eye tracking module 802 and a processor 801 . The eye tracking module 802 is used to acquire M viewpoints. The M viewpoints include viewpoint 1 and viewpoint 2 . Viewpoint 1 corresponds to location A. Viewpoint 2 corresponds to position C. The processor 801 is configured to control the backlight assembly 102 to move among M positions among the N positions according to the M viewpoints. The N locations include location A, location B, and location C, respectively. The M positions include position A and position C.

It should be understood that FIG. 8 is only an example of the M positions provided in the embodiment of the present application. In practical applications, the processor 801 can control the backlight assembly 102 to move among the corresponding M positions according to the M viewpoints. For example, M viewpoints include viewpoint 2 and viewpoint 3 . The M positions include position B and position C. For another example, the M viewpoints include viewpoint 1 and viewpoint 3 . The M positions include position B and position A.

In practical applications, when the value of N is too large, the image frame rate of a single user will be reduced, thereby affecting user experience. Therefore, the present application can improve the image frame rate of a single user by limiting the value of N, thereby improving user experience. For example, the value range of N may be between 2 and 10. The value of N can be 2 or 10.

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

For example, in FIG. 8, the backlight assembly 102 is moved between position A and position C. As shown in FIG. The backlight assembly 102 stays at position A for 1 millisecond. During the stay, the backlight assembly 102 outputs the first light beam. After staying for 1 millisecond, the backlight assembly 102 takes 1 millisecond to move from position A to 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 moves from position C to position A in 1 millisecond. Repeat the above process. During the above process, the backlight assembly 102 stays at the position A and the position C, and outputs light beams. Therefore, the M locations include location A and location C. During the above process, the backlight assembly 201 may not stay at the position B. Therefore, the M positions do not include position B.

For another example, the backlight assembly 102 moves between position A and position B. As shown in FIG. The backlight assembly 201 stays at position A for 1 millisecond. During the stay, the backlight assembly 102 outputs the first light beam. After staying for 1 millisecond, the backlight assembly 102 takes 2 milliseconds to move from position A to 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 position B to position A. Repeat the above process. During the above process, the backlight assembly 102 stays at the position A and the position B, and outputs light beams. Therefore, the M locations include location A and location B. During the above process, the backlight assembly 102 will pass through the position C, but the backlight assembly 102 may not stay at the position C, and output no light beam at the position C. Therefore, the M positions do not include position C.

In practical application, the distance between the user and the diffusion screen 105 will change, so as to improve the viewing experience of the user. For example, in FIG. 8 , the distance between the viewpoint 2 corresponding to the user's left eye and the diffusion screen 105 is T1 . At this time, the spot size of the imaging light obtained according to the second light beam on the imaging plane where the viewpoint 2 is located matches the size of the left eye. If the user approaches the diffusion screen 105, the light spot on the left eye will become larger. If the light spots cover both the user's left and right eyes at the same time, crosstalk will occur, affecting the user's stereoscopic vision experience.

To this end, optical element 302 may be a variable focus device. The human eye tracking module 802 can be used to obtain the distance between the viewpoint and the diffusion screen 105 . The processor 801 is configured to adjust the focal length of the optical element 302 according to the above distance. For example, when 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.

According to the foregoing description, it can be seen that when the value of N is too large, the image frame rate of a single user will be reduced, thereby affecting user experience. Therefore, in order to provide more viewing positions and increase the image frame rate of a single user, the stereoscopic projection system 100 may include K backlight assemblies. K is an integer greater than 1. Each of the K backlight assemblies is used to output two light beams to the spatial light modulator at different angles to obtain 2×K light beams. The spatial light modulator is used to modulate 2×K light beams to obtain 2×K imaging lights. The spatial light modulator is used to output 2×K paths of imaging light to the diffusion screen at different angles. For the description of any one of the backlight components, reference may be made to the related descriptions in FIGS. 1 to 8 above. In the following, K is equal to 3 as an example for description.

FIG. 9 is a fourth structural schematic diagram of the stereoscopic projection system provided by the embodiment of the present application. As shown in FIG. 9 , a stereoscopic projection system 100 includes a display device 101 and a diffusion screen 105 . The display device 101 includes three backlight assemblies, a spatial light modulator 103 and a lens 104 . The three backlight assemblies include a backlight assembly 102 , a backlight assembly 901 and a backlight assembly 902 . The backlight assembly 201 outputs the first light beam and the second light beam in time division. For the description of the backlight assembly 901 and the backlight assembly 902 , reference may be made to the description of the backlight assembly 102 . 3 backlight components are used to output 6 beams.

The spatial light modulator 103 is used to modulate 6 beams of light to obtain 6 channels of imaging light. The lens 104 is used to change the transmission direction of the 6-channel imaging light, and transmit the 6-channel imaging light to the diffusion screen 105 . The diffusion screen 105 is used to diffuse the 6 beams to obtain 6 imaging beams. The 6 imaging lights are irradiated to viewpoints 1 to 6 respectively. The 6 imaging lights correspond to viewpoints 1 to 6 one by one. Two viewpoints among viewpoints 1 to 6 correspond to one backlight assembly. In FIG. 9 , the backlight assembly 102 corresponds to viewpoint 1 and viewpoint 2 . The backlight assembly 901 corresponds to viewpoint 3 and viewpoint 4 . The backlight assembly 902 corresponds to viewpoint 5 and viewpoint 6 .

It should be understood 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 only output light beams corresponding to the viewpoint 2 . The backlight assembly 902 may only output light beams corresponding to the viewpoint 5 . The backlight assembly 901 outputs two light beams corresponding to viewpoint 4 and viewpoint 5 .

It should be understood that when the stereoscopic projection system 100 includes K backlight assemblies, the 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 viewpoint 4 and viewpoint 5 . At this time, the two imaging lights formed by the two light beams output by 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, the eyes of the user at any of the above-mentioned viewing positions can still receive the imaging light carrying different image information, so as to obtain stereoscopic visual enjoyment.

According to the foregoing description, it can be known that the stereoscopic projection system 100 can move the backlight assembly through a moving mechanism. When the stereoscopic projection system 100 includes K backlight assemblies, the moving mechanism can be used to move the K backlight assemblies. In order to reduce the structural complexity of the moving mechanism, the moving mechanism can move K backlight assemblies in the same direction. At this time, each of the K backlight assemblies moves in the same direction during the movement. For example, in FIG. 9, at a certain moment, the backlight assembly 102, the backlight assembly 901, and the backlight assembly 902 move upward simultaneously. At another moment, the backlight assembly 102, the backlight assembly 901 and the backlight assembly 902 move downward simultaneously.

In practical applications, multiple light source devices distributed in an arc will occupy more space. In the embodiment of the present application, when the stereoscopic projection system 100 includes multiple light source devices, the multiple light source devices may be arranged in parallel. Parallel arrangement means that the light emitting surfaces of multiple light source devices are on the same plane, and the beam output directions of the first light source device and the second light source device are the same. This plane is perpendicular to the output direction.

In the aforementioned examples of FIGS. 4 a to 6 , the optical element 302 is used to obtain the first light beam by transmitting the original light beam. It can be seen from the foregoing description that the optical element 302 may also be a mirror. Therefore, the optical element 302 can also be used to obtain the first light beam by reflecting the original light beam. For the description of obtaining the first light beam through reflection by the optical element 302 , reference may be made to the foregoing descriptions of FIGS. 4 a to 6 .

In practical applications, the distance between the user and the diffusion screen 105 may be limited by space factors. In order to reduce the distance between the user and the diffusion screen 105, the imaging light output by the diffusion screen 105 may be amplified by a curved mirror. FIG. 10 is a schematic structural diagram of a projection system provided by an embodiment of the present application. As shown in FIG. 10 , a projection system 1100 includes a stereoscopic projection system 100 and a curved mirror 1101 . The stereoscopic projection system 100 is used to output two paths of imaging light. Regarding the description of the stereoscopic projection system 100 , reference may be made to the description of the stereoscopic projection system 100 in any one of FIGS. 1 to 9 . The curved mirror 1101 is used to reflect two paths of imaging light, and there is an included angle between the reflected two paths of imaging light. The focal length of the curved mirror 1101 is f. The distance between the diffusion screen 105 and the curved mirror 1101 is d.

There is a vertical distance between each point on the curved mirror 1101 and the diffusion screen 105 . d can be the farthest vertical distance. Alternatively, d may be the linear distance between the center point of the diffusion screen 105 and the target point on the curved mirror 1101 . The imaging light output from the central point is irradiated to the target point on the curved mirror 1101 . d is less than f. When d is smaller than f, the curved mirror 1101 can magnify the virtual image. Therefore, when the distance between the user and the projection system 1100 is relatively short, the user can see an enlarged virtual image, thereby improving user experience.

Referring to FIG. 11 , FIG. 11 is a schematic circuit diagram of a stereoscopic projection system provided by an embodiment of the present application.

As shown in Figure 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 supply module 1006, a wireless communication module 1007, and an I/O interface 1008 , a video interface 1009, a processor area network (Controller Area Network, CAN) transceiver 1010, a display circuit 1028, a display panel 1029, and the like. Among them, the processor 1001 and its surrounding components, such as internal memory 1002, CAN transceiver 1010, audio module 1004, video module 1005, power supply module 1006, wireless communication module 1007, I/O interface 1008, video interface 1009, touch unit 1010. The display circuit 1028 may be connected through a bus. Processor 1001 may be called a front-end processor.

In addition, the circuit diagrams shown in the embodiments of the present application do not constitute specific limitations on the stereoscopic projection system. In some other embodiments of the present application, the stereoscopic projection system may include more or fewer components than those shown in the illustrations, or some components may be combined, or some components may be separated, or different component arrangements may be made. The illustrated components can be realized in hardware, software or a combination of software and hardware.

Wherein, 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), video codec, digital signal processor (Digital Signal Processor, DSP), baseband processor, and/or neural network processor (Neural-Network Processing Unit, NPU), etc. Wherein, different processing units may be independent 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, the operating system of the stereoscopic projection system, the AR Creator software package, etc. are stored. In some embodiments, the memory in 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 use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 1001 is reduced, thereby improving the efficiency of the system.

In addition, if the stereoscopic projection system in this embodiment is installed on a vehicle, the function of the processor 1001 may be implemented by a domain processor on the vehicle.

In some embodiments, the stereoscopic projection system may further include a plurality of input/output (Input/Output, I/O) interfaces 1008 connected 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 transceiver transmitter (UniversalAsynchronous Receiver/Transmitter, UART) interface, mobile industry processor interface (MobileIndustry Processor Interface, MIPI), general-purpose input and output (General-Purpose Input/Output, GPIO) interface, subscriber identity module (Subscriber Identity Module, SIM) interface, And/or a Universal Serial Bus (Universal Serial Bus, USB) interface, etc. The above-mentioned I/O interface 1008 can be connected to devices such as a mouse, a touch screen, a keyboard, a camera, a loudspeaker/speaker, and a microphone, and can also be connected to physical buttons on a stereoscopic projection system (such as volume keys, brightness adjustment keys, power-on/off keys, etc.).

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

The external memory interface 1003 can be used to connect an external memory (such as a Micro SD card), and the external memory can store data or program instructions as required, and the processor 1001 can perform operations such as reading and writing these data or program execution through the external memory interface 1003.

The audio module 1004 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signal. The audio module 1004 can also be used for encoding and decoding audio signals, such as playing or recording. In some embodiments, the audio module 1004 can be set in the processor 1001 , or some functional modules of the audio module 1004 can be set in the processor 1001 . The stereoscopic projection system can realize the audio function through the audio module 1004 and the application processor.

Video interface 1009 can receive the audio and video of external input, and it can specifically be High Definition Multimedia Interface (High Definition Multimedia Interface, HDMI), Digital Video Interface (Digital Visual Interface, DVI), Video Graphics Array (Video Graphics Array, VGA), display port (Display port, DP), low voltage differential signaling (Low Voltage Differential Signaling, LVDS) interface, etc., and the video interface 1009 can also output video to the outside. For example, the stereoscopic projection system receives video data sent by the navigation system or receives video data sent by the domain processor through the video interface.

The video module 1005 can decode the video input by the video interface 1009, for example, perform H.264 decoding. The video module can also encode the video captured by the stereoscopic projection system, for example, perform H.264 encoding on the video captured by the external camera. In addition, the processor 1001 may also decode the video input from the video interface 1009, and then output the decoded image signal to the display circuit.

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

The display circuit 1028 and the display panel 1029 jointly realize the function of displaying images. The display circuit 1028 receives the image signal output by the processor 1001, processes the image signal, and then inputs it to the display panel 1029 for imaging. The display circuit 1028 can also control the images displayed on the display panel 1029 . For example, control parameters such as display brightness or contrast. Wherein, the display circuit 1028 may include a driving circuit, an image control circuit and the like. Wherein, the above-mentioned display circuit 1028 and display panel 1029 may be located in the pixel component 502 .

The display panel 1029 is used for modulating the light beam input by the light source according to the input image signal, so as to generate a visible image. The display panel 1029 can be a liquid crystal on silicon panel, a liquid crystal display panel or a digital micromirror device.

In this embodiment, the video interface 1009 can receive input video data (or referred to as a video source), and the video module 1005 performs decoding and/or digital processing to output an image signal to the display circuit 1028, and the display circuit 1028 The display panel 1029 is driven to image the light beam emitted by the light source, thereby generating a visible image (emitting imaging light).

The power module 1006 is used to provide power for the processor 1001 and the light source according to the input power (such as direct current). The power module 1006 may include a rechargeable battery, and the rechargeable battery may provide power for the processor 1001 and the light source. The light emitted by the light source can be transmitted to the display panel 1029 for imaging, thereby forming an image light signal (imaging light).

In addition, the above-mentioned power supply module 1006 can be connected to a power supply module (such as a power battery) of a car, and the power supply module of the car supplies power to the power supply module 1006 of the stereoscopic projection system.

The wireless communication module 1007 can enable the stereoscopic projection system to communicate wirelessly with the outside world, and it can provide wireless local area network (Wireless Local Area Networks, WLAN) (such as wireless fidelity (Wireless Fidelity, Wi-Fi) network), bluetooth (Bluetooth, BT) , Global Navigation Satellite System (Global Navigation Satellite System, GNSS), Frequency Modulation (Frequency Modulation, FM), Near Field Communication Technology (Near Field Communication, NFC), Infrared Technology (Infrared, IR) and other wireless communication solutions. The wireless communication module 1007 may be one or more devices integrating at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via the antenna, frequency-modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 1001 . The wireless communication module 1007 can also receive the signal to be sent from the processor 1001, frequency-modulate it, amplify it, and convert it into electromagnetic wave and radiate it through the antenna.

In addition, the video data decoded by the video module 1005 can be received through the wireless communication module 1007 or read from the internal memory 1002 or external memory in addition to being input through the video interface 1009. The internal wireless local area network receives video data from the terminal equipment or the vehicle entertainment system, and the stereoscopic projection system can also read the audio and video data stored in the internal memory 1002 or the external memory.

The embodiment of the present application also provides a vehicle, which is installed with any one of the aforementioned stereoscopic projection systems. The stereoscopic projection system is used to output two-way imaging light. The two imaging lights carry image information with different parallax. The output two-way imaging light is reflected to the windshield through the reflector, and the windshield further reflects the two-way imaging light to form a virtual image. The virtual image is on one side of the windshield and the driver or passenger is on the other side of the windshield. The reflected two-way imaging light is irradiated to the driver's or passenger's eyes respectively. For example, the first imaging light is irradiated to the passenger's left eye. The second imaging light shines on the passenger's right eye.

The embodiment of the present application also provides a vehicle, which is installed with the projection system shown in FIG. 10 . FIG. 12 is a schematic diagram of an embodiment of the present application providing a projection system installed in a vehicle. The windshield of a vehicle can be used as a curved mirror in a 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 used to output two paths of imaging light. The two imaging lights carry image information with different parallax. The windshield is used to reflect two imaging lights to form a virtual image. The virtual image is on one side of the windshield and the driver or passenger is on the other side of the windshield. The reflected two-way imaging light is irradiated to the driver's or passenger's eyes respectively. For example, the first imaging light is irradiated to the passenger's left eye. The second imaging light shines on the passenger's right eye.

Exemplary vehicles may be cars, trucks, motorcycles, buses, boats, airplanes, helicopters, lawn mowers, recreational vehicles, fairground vehicles, construction equipment, streetcars, golf carts, trains, and carts etc., the embodiments of the present application are not specifically limited. The stereoscopic projection system can be installed on the Instrument Panel (IP) platform of the vehicle, at the co-driver's position or the main driver's position, and can also be installed on the back of the seat. When the above-mentioned stereoscopic projection system is applied to a vehicle, it may be called a Head Up Display (HUD), and may be used to display navigation information, vehicle speed, power/fuel level, and the like.

Fig. 13 is a schematic diagram of a possible functional framework of a vehicle provided by an embodiment of the present application.

As shown in FIG. 13 , various subsystems may be included in the functional framework of the vehicle, for example, a control system 14 in the illustration, a sensor system 12, one or more peripheral devices 16 (one is shown as an example in the illustration), a power supply 18. A computer system 20 and a display system 32. Optionally, the vehicle may also include other functional systems, for example, an engine system that provides power for the vehicle, etc., which are not limited in this application.

Among them, the sensor system 12 may include several detection devices, which can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to certain rules. As shown in the figure, these detection devices may include 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 range finder, a camera device, a wheel speed sensor, The steering sensor, gear sensor, or other components used for automatic detection, etc., are not limited in this application.

The control system 14 may include several elements such as the illustrated steering unit, braking unit, lighting system, automatic driving system, map navigation system, network time synchronization system and obstacle avoidance system. Optionally, the control system 14 may also include components such as an accelerator processor and an engine processor for controlling the driving speed of the vehicle, which are not limited in this application.

Peripherals 16 may include elements such as a communication system, a touch screen, a user interface, a microphone, and speakers as shown, among others. Among them, the communication system is used to realize the network communication between the vehicle and other devices except the vehicle. In practical applications, the communication system can use wireless communication technology or wired communication technology to realize network communication between vehicles and other devices. The wired communication technology may refer to communication between the vehicle and other devices through network cables or optical fibers.

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

Several functions of the vehicle are controlled and realized by the computer system 20 . The computer system 20 may include one or more processors 2001 (one processor is used as an example in the figure) and a memory 2002 (also called a storage device). In practical applications, the memory 2002 is also inside the computer system 20, or outside the computer system 20, for example, as a buffer in a vehicle, which is not limited in this application. in,

For the description of the processor 2001, reference may be made to the foregoing description of the processor 1001. The processor 2001 may include one or more general-purpose processors, for example, a graphics processing unit (graphic processing unit, GPU). The processor 2001 can be used to run related programs stored in the memory 2002 or instructions corresponding to the programs, so as to realize corresponding functions of the vehicle.

The memory 2002 may include volatile memory (volatile memory), for example, RAM; the memory may also include non-volatile memory (non-volatile memory), for example, ROM, flash memory (flash memory) or solid state hard disk (solid state) drives, SSD); the storage 2002 may also include a combination of the above-mentioned types of storage. The memory 2002 can be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2001 calls the program codes or instructions stored in the memory 2002 to realize corresponding functions of the vehicle. This function includes but is not limited to some or all of the functions in the schematic diagram of the vehicle functional framework shown in FIG. 13 . In this application, a set of program codes for vehicle control can be stored in the memory 2002, and the processor 2001 calls the program codes to control the safe driving of the vehicle. How to realize the safe driving of the vehicle will be described in detail below in this application.

Optionally, in addition to storing program codes or instructions, the memory 2002 can also store information such as road maps, driving routes, and sensor data. The computer system 20 can combine other components in the vehicle functional framework diagram, such as sensors in the sensor system, GPS, etc., to realize related functions of the vehicle. For example, the computer system 20 can control the driving direction or driving speed of the vehicle based on the data input from the sensor system 12 , which is not limited in this application.

The display system 32 may include several elements such as a processor, a curved mirror, and the stereoscopic projection system 100 described above. The processor is used to generate images according to user instructions (such as generating images including vehicle status such as vehicle speed, power/fuel level, and augmented reality AR content), and send the image content to the stereoscopic projection system 100 . The stereoscopic projection system 100 is used 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 components in the display system 32 may also be implemented by other subsystems of the vehicle, for example, the processor may also be a component in the control system 14 .

Wherein, FIG. 13 of the present application includes four subsystems, and the sensor system 12, the control system 14, the computer system 20 and the display system 32 are only examples and do not constitute limitations. In practical applications, vehicles can combine several components in the vehicle according to different functions, so as to obtain subsystems with corresponding different functions. In practical application, the vehicle may include more or less systems or elements, which is not limited in this application.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should cover Within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (19)

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

the backlight component is used for outputting two light beams to the spatial light modulator at different angles in a time-sharing manner;

the spatial light modulator is used for modulating the two light beams in a time-sharing manner 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.

2. The stereoscopic projection system of claim 1, wherein the backlight assembly comprises a first light source device and a second light source device, the two light beams comprising a first light beam and a second light beam;

the first light source device and the second light source device are used for outputting the first light beam and the second light beam in a time-sharing mode, the first light source device corresponds to the first light beam, and the second light source device corresponds to the second light beam.

3. The stereoscopic projection system of claim 1 wherein the two beams of light comprise a first beam of light and a second beam of light;

the backlight assembly is used for outputting two light beams to the spatial light modulator at different angles in a time-sharing mode; the backlight assembly is used for outputting the first light beam at a first position and outputting the second light beam at a second position.

4. The stereoscopic projection system of claim 3, wherein the backlight assembly comprises a light source device and an optical element;

the position of the light source device relative to the spatial light modulator is unchanged, and the light source device is used for outputting an original light beam;

the backlight assembly for outputting the first light beam at a first position comprises: the optical element is used for obtaining the first light beam according to the original light beam at the first position;

the backlight assembly for outputting the second light beam at a second position comprises: the optical element is used for changing the transmission direction of the original light beam at the second position to obtain the second light beam.

5. The stereoscopic projection system of claim 4 wherein the first and second beams output by the optical element have an overlap region, the spatial light modulator being located in the overlap region.

6. The stereoscopic projection system of claim 3, wherein the backlight assembly comprises 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 backlight assembly for outputting the first light beam at a first position comprises: the optical element is used for obtaining the first light beam according to the first original light beam at the first position;

the light source device is used for outputting a second original light beam at a fourth position;

the backlight assembly for outputting the second light beam at a second position comprises: 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 an offset of the third position and the first position is different from an offset of the fourth position and the second position.

7. The stereoscopic projection system of claim 6 wherein the third location and the fourth location are in a first plane, the light source device being configured to move from the third location to the fourth location through a first path.

8. The stereoscopic projection system of claim 7 wherein the first location and the second location are in a second plane, the optical element configured to move from the first location to the second location via a second path.

9. The stereoscopic projection system of claim 8 wherein the first plane and the second plane are parallel, the first path and the second path are parallel, and the second path has a length less than a length of the first path.

10. The stereoscopic projection system of any of claims 6 to 9,

the optical element is also used for changing the divergence angle of the second original light beam at the second position to obtain the second light beam.

11. The stereoscopic projection system of claim 10,

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

12. The stereoscopic projection system of any of claims 4-11 wherein the optical element is a variable focus device.

13. The stereoscopic projection system of any of claims 3 to 11,

the backlight assembly is used for outputting two light beams to the spatial light modulator at different angles in a time-sharing mode and comprises: the backlight assembly is used for moving between M positions and outputting M light beams at different angles, wherein the M light beams comprise the two light beams, the M positions comprise the first position and the second position, the M positions correspond to the M light beams one to one, and M is an integer larger than 1.

14. The stereoscopic projection system of claim 13 further comprising a human eye tracking module;

the human eye tracking module is used for acquiring M viewpoints, and the M viewpoints correspond to the M positions one by one;

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

15. The stereoscopic projection system of claim 14 wherein N ranges from 2 to 10.

16. The stereoscopic projection system of any of claims 1 to 15,

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

each backlight assembly in the K backlight assemblies is used for outputting two light beams to the spatial light modulator at different angles to obtain 2 xK light beams;

the spatial light modulator is used for modulating the two light beams in a time-sharing manner according to different image information to obtain two paths of imaging light, and the two paths of imaging light are output to the diffusion screen at different angles, and the two paths of imaging light comprise: the spatial light modulator is used for modulating the 2 xK light beams to obtain 2 xK imaging light, and outputting the 2 xK imaging light to the diffusion screen at different angles.

17. The stereoscopic projection system of claim 16 wherein each of the K backlight assemblies moves in the same direction during movement.

18. A projection system comprising a curved mirror and a stereoscopic projection system according to any of claims 1 to 17;

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

the curved mirror is used for reflecting the two paths of imaging light after diffusion, an included angle exists between the two paths of imaging light after reflection, 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.

19. A vehicle comprising a stereoscopic projection system as claimed in any of claims 1 to 17 or a projection system as claimed in claim 18, the stereoscopic projection system or the projection system being mounted on the vehicle.

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