阅读说明：本技术 面对多用户的基于入瞳分割复用的三维显示系统 (Multi-user-facing three-dimensional display system based on entrance pupil division multiplexing ) 是由 滕东东 于 2020-06-24 设计创作，主要内容包括：本发明公开一种面对多用户的基于入瞳分割复用的三维显示系统,其包括多视区投射光学引擎、光阀阵列、控制单元。其中,多视区投射光学引擎包括显示器件和视区引导器件,在视区引导器件作用下显示器件投射多个视区,各视区分别接收显示器件上对应像素群所投射光信息；光阀阵列包括多组光阀组,各光阀组由多于一个的、时序开关的光阀组成,不同光阀组分别佩戴于不同的眼睛前；控制单元控制各光阀组的光阀时序开关,并同步加载各自对应光信息至各像素。基于时分复用,各光阀组时序引导对应像素群投射多于一个的视图至置于对应视区处的眼睛,基于单目多视图的技术路径,克服传统三维显示固有的聚焦-会聚冲突问题,提高三维显示视觉的舒适性。(The invention discloses a multi-user-oriented three-dimensional display system based on entrance pupil division multiplexing. The multi-visual area projection optical engine comprises a display device and a visual area guiding device, wherein the display device projects a plurality of visual areas under the action of the visual area guiding device, and each visual area receives projection light information of a corresponding pixel group on the display device; the light valve array comprises a plurality of groups of light valve groups, each light valve group consists of more than one light valve with a time sequence switch, and different light valve groups are respectively worn in front of different eyes; the control unit controls the light valve timing switch of each light valve group and synchronously loads the corresponding light information to each pixel. Based on time division multiplexing, each light valve group guides the corresponding pixel group to project more than one view to the eyes arranged at the corresponding visual area in a time sequence, and based on the technical path of monocular multiple views, the problem of focusing-converging conflict inherent in the traditional three-dimensional display is solved, and the comfort of the three-dimensional display vision is improved.)

1. A multi-user-facing three-dimensional display system based on entrance pupil division multiplexing, comprising:

the multi-visual-area projection optical engine (10) comprises a display device (11) and a visual area guiding device (12), wherein the display device (11) comprises a plurality of pixels capable of loading optical information, the visual area guiding device (12) is arranged at a position corresponding to the display device (11) and is used for guiding the propagation sagittal direction of emergent light of each pixel of the display device (11), so that M pixel groups on the display device (11) respectively project light to M visual areas corresponding to the pixel groups, and each visual area interval is set to be that an observer can not receive the light emitted by the same visual area through two eyes, wherein M is not less than or equal to 2;

wherein each pixel group is composed of a part of pixels on the display device (11) and the composed pixels of different pixel groups are different from each other,

or each pixel group consists of at least part of pixels on the display device (11) respectively, and the time points of information loading of the constituent pixels of different pixel groups containing common pixels are different from each other, and the visual area corresponding to the pixel group to which each pixel belongs at each time point is the visual area corresponding to the pixel at the time point;

a light valve array (20), the light valve array (20) comprising N light valve groups, each light valve group consisting of K light valves, different light valve groups being respectively worn on different eyes (50), wherein N ≧ 2, K ≧ 2;

the control unit (30) is respectively connected with the display device (11) and the light valve array (20), the control unit (30) is used for controlling K light valves of each light valve group to be opened in time sequence in each time period formed by K adjacent time points, only one light valve of each light valve group is opened at each time point, and the control unit is used for controlling each pixel of the display device (11) to synchronously load light information of projection information of a scene to be displayed, which relates to the opened light valve in a corresponding visual area, on the pixel;

the multi-user facing three-dimensional display system based on entrance pupil division multiplexing is set to be based on time division multiplexing, and each light valve group is guided by time sequence to project more than one view to the eye corresponding to the light valve group corresponding to the pixel group corresponding to the visual area where the light valve group is located.

2. The multi-user-faced entrance pupil division multiplexing-based three-dimensional display system according to claim 1, wherein each pixel of the display device (11) is composed of W sub-pixels for emitting W color lights, each light valve of the light valve array (20) is correspondingly composed of W wavelength sub-apertures, the W wavelength sub-apertures respectively allow only the W color lights to pass through in a one-to-one correspondence, and each sub-pixel is corresponding to a wavelength sub-aperture allowing the emitted light to pass through;

and the control unit (30) can control each sub-pixel of the display device (11) to synchronously load the projection information of the scene to be displayed on the sub-pixel, which is opened corresponding wavelength sub-aperture in the corresponding view area of the pixel to which the sub-pixel belongs, at each time point.

3. The multi-user facing three-dimensional entrance pupil division multiplexing based display system according to any one of claims 1-2, wherein the view area directing device (12) is a beam splitter grating (121), the beam splitter grating (121) is disposed between the display device (11) and the light valve array (20), and directs the M pixel groups to project the corresponding light information to the M view areas respectively based on a grating beam splitting principle.

4. The multi-user facing entrance pupil division multiplexing based three-dimensional display system according to any one of claims 1 to 2, wherein the viewing zone guiding device (12) is a sequential backlight device (122), the sequential backlight device (122) comprises a sequential light source array (1221) and a light converging device (1222), the light converging device (1222) is disposed between the sequential light source array (1221) and the display device (11), wherein the M light sources of the sequential light source array (1221) are respectively imaged to a one-to-one correspondence of M image points by the light converging device (1222), and each light source projection light is diffracted by the display device (11) to form a respective corresponding viewing zone at the corresponding image point.

5. The multi-user facing entrance pupil division multiplexing based three-dimensional display system according to any one of claims 1-2, wherein the viewing zone directing device (12) is a sagittal modulation unit (123) disposed between the display device (11) and the light valve array (20), the sagittal modulation unit (123) being comprised of one-to-one micro-structured elements for each pixel of the display device (11), each micro-structured element directing a corresponding pixel to project a light beam to a corresponding viewing zone of a pixel group to which the pixel belongs.

6. The multi-user-facing three-dimensional input pupil segmentation multiplexing display system according to any one of claims 1-2, further comprising a tracking and positioning unit (40), wherein the tracking and positioning unit (40) is connected to the control unit (30) for tracking and positioning the positions of the light valve sets and the light valves thereof in real time and determining the viewing zones to which the positions belong, and the control unit (30) can control the display device (11) to load information according to the viewing zones to which the light valves are located.

7. A multi-user facing entrance pupil segmentation multiplexing based three-dimensional display system according to any of claims 1-2, characterized by further comprising a barrier (60), the barrier (60) being adapted to block light transmitted by the display device (10) through the non-light valve area from entering the viewer's eye (50).

8. The multi-user-facing, entrance pupil division multiplexing-based three-dimensional display system of claim 1, wherein each light valve consists of L orthogonal sub-apertures, the L orthogonal sub-apertures corresponding to L orthogonal properties, respectively, each orthogonal sub-aperture allowing only light with the corresponding orthogonal property to pass through, and cutting off light with the other (L-1) orthogonal properties, wherein L ≧ 2;

the multi-user facing three-dimensional display system based on entrance pupil division multiplexing is arranged in such a way that pixels with interval (L-1) pixels in each pixel group are grouped, the emergent light of the L pixel groups has the L orthogonal characteristics in a one-to-one correspondence mode, and the orthogonal sub-aperture allowing the projection light of each pixel to pass through is the corresponding orthogonal sub-aperture of the pixel;

and the control unit (30) can control each pixel of the display device (11) to synchronously load the projection information of the scene to be displayed, which is opened corresponding orthogonal sub-aperture in the visual area corresponding to the pixel, on the pixel at each time point.

9. The multi-user-facing three-dimensional entrance pupil division multiplexing-based display system of claim 1, wherein each light valve comprises V orthogonal sub-apertures arranged in the same order, each adjacent L orthogonal sub-apertures corresponding to L orthogonal properties, each orthogonal sub-aperture allowing only light with the corresponding orthogonal property to pass through and blocking light with the other (L-1) orthogonal properties, wherein V ≧ L ≧ 2;

the three-dimensional display system based on the entrance pupil division multiplexing facing multiple users is arranged in such a way that each pixel group of a display device (11) is divided into V pixel blocks which sequentially correspond to V orthogonal sub-apertures of each light valve according to a spatial arrangement order, projection light of each pixel block is arranged to have orthogonal characteristics corresponding to the corresponding orthogonal sub-apertures, and each pixel takes the corresponding orthogonal sub-aperture of the pixel block as the corresponding orthogonal sub-aperture of the pixel;

and the control unit (30) can control each pixel of the display device (11) to synchronously load the projection information of the scene to be displayed, which is opened corresponding orthogonal sub-aperture in the visual area corresponding to the pixel, on the pixel at each time point.

10. The multi-user-oriented, entrance pupil division multiplexing-based three-dimensional display system according to any one of claims 8 to 9, wherein the orthogonal characteristics are linear polarization characteristics perpendicular to each other, optical rotation characteristics different in handedness, or wavelength characteristics of complementary colors, or a combination of any two or more of linear polarization characteristics perpendicular to each other, optical rotation characteristics different in handedness, and wavelength characteristics of complementary colors.

11. The multi-user-facing three-dimensional entrance pupil division multiplexing-based display system according to any one of claims 8 to 9, wherein each pixel of the display device (11) is composed of W sub-pixels for emitting W color lights, each orthogonal sub-aperture of each light valve of the light valve array (20) is composed of W wavelength sub-apertures, respectively, the W wavelength sub-apertures respectively allow only one of the W color lights to pass through in a one-to-one correspondence, and each sub-pixel corresponds to a wavelength sub-aperture allowing its emitted light to pass through;

and the control unit (30) can control each sub-pixel of the display device (11) to synchronously load the projection information of the scene to be displayed, which is related to the wavelength sub-aperture corresponding to the sub-pixel, on the light information of the sub-pixel at each time point, wherein at each time point, the wavelength sub-aperture corresponding to each sub-pixel is in the visual area corresponding to the pixel to which the sub-pixel belongs, and the sub-pixel corresponds to the corresponding wavelength sub-aperture in the opened orthogonal sub-aperture corresponding to the pixel to which the sub-pixel belongs.

Technical Field

The invention relates to the technical field of three-dimensional display, in particular to a multi-user-oriented three-dimensional display system based on entrance pupil division multiplexing.

Background

Compared with the traditional two-dimensional display, the three-dimensional display with the depth information presenting capability has great attention because the dimension of the display scene is consistent with the real space of people's life. However, most of the existing three-dimensional displays present a three-dimensional scene based on the conventional stereoscopic technology, and present depth information based on the binocular parallax principle by projecting a view corresponding to each of the two eyes of an observer. In this process, each eye of the viewer needs to focus on the display surface to see clearly the respective corresponding view, while the binocular viewing directions intersect the displayed scene to trigger the viewer's perception of depth, thereby resulting in an inconsistency between monocular depth of focus and binocular depth of convergence, i.e., a focus-convergence conflict problem. In a natural situation, when an observer observes a real three-dimensional scene, the monocular depth of focus and the binocular depth of convergence coincide with the spatial depth to which the observer focuses attention. Therefore, the focusing-convergence conflict of the traditional stereoscopic technology is contrary to the physiological habit of natural evolution of human body, which can cause visual discomfort of observers and is a bottleneck problem which hinders the popularization and application of the three-dimensional display technology.

CN109313350A (three-dimensional display system and method based on observer entrance pupil division multiplexing) describes a three-dimensional display system based on the monocular multiview principle to overcome the problem of focusing-converging conflict, wherein more than one time-sequential light valves are disposed in front of each eye to guide corresponding more than one view to enter the eye through different regions of the pupil, and the three-dimensional scene display that can be naturally focused by the eye is formed by spatial superposition of sagittal light rays from the more than one view. However, the system described in this patent does not consider the multi-user situation, and although a plurality of users are allowed to wear glasses composed of a plurality of light valves respectively for the visual experience, the light information sources received by different users are the same. In fact, for a real three-dimensional scene, users at different positions observe different light information, and corresponding light information sources are different.

Disclosure of Invention

In order to solve the above problems, the present invention provides a three-dimensional display system based on entrance pupil division multiplexing facing multiple users to realize three-dimensional light field display facing multiple users. The invention realizes the accommodation of a plurality of users by combining the light valve array and the multi-visual-area projection optical engine, and improves the display effect by screening the pixels projecting light with different characteristics by using adjacent sub-apertures through the sub-aperture of each light valve. The invention discloses a multi-user-oriented three-dimensional display system based on entrance pupil division multiplexing. The multi-visual area projection optical engine comprises a display device and a visual area guiding device, a plurality of visual areas are projected under the action of the visual area guiding device, and each visual area receives projection light information of a pixel group formed by corresponding pixels on the display device. The light valve array comprises a plurality of groups of light valve groups, each light valve group consists of more than one light valve with a time sequence switch, and different light valve groups are respectively worn in front of different eyes. The control unit controls each pixel group to respectively project corresponding light information to the corresponding visual area. Based on time division multiplexing, each light valve group guides the corresponding pixel group to project more than one view to the eyes arranged at the corresponding visual area in a time sequence, and based on the technical path of monocular multiple views, the problem of focusing-converging conflict inherent in the traditional three-dimensional display is solved, and the comfort of the three-dimensional display vision is improved.

In order to build a display system with comfortable three-dimensional vision that can accommodate multiple users, by combining multi-view projection and monocular projection of more than one view, the present invention provides the following solutions:

a multi-user facing three-dimensional display system based on entrance pupil division multiplexing, comprising:

the multi-visual-area projection optical engine comprises a display device and a visual area guiding device, wherein the display device comprises a plurality of pixels capable of loading optical information, the visual area guiding device is arranged at a position corresponding to the display device and used for guiding the propagation vector direction of emergent light of each pixel of the display device, so that M pixel groups on the display device respectively project light to M visual areas corresponding to the pixel groups, the distance between the visual areas is set to be that the binocular eyes of an observer cannot receive the light emergent from the same visual area, and M is not less than or equal to 2;

wherein each pixel group is composed of a part of pixels on the display device and the composed pixels of different pixel groups are different from each other,

or each pixel group consists of at least part of pixels on the display device respectively, the time points of information loading of the pixels comprising the shared pixels and different pixel groups are different, and the visual area corresponding to the pixel group to which each pixel belongs at each time point is the visual area corresponding to the pixel at the time point;

the light valve array comprises N light valve groups, each light valve group consists of K light valves, different light valve groups are respectively worn on different eyes, and N is not less than 2, and K is not less than 2;

the control unit is respectively connected with the display device and the light valve array, and is used for controlling the K light valves of each light valve group to be opened in a time sequence in each time period formed by K adjacent time points, only one light valve of each light valve group is opened at each time point, and the control unit is used for controlling each pixel of the display device to synchronously load light information of a scene to be displayed on the pixel about projection information of the opened light valve in the corresponding visual area;

the multi-user facing three-dimensional display system based on entrance pupil division multiplexing is set to be based on time division multiplexing, and each light valve group is guided by time sequence to project more than one view to the eye corresponding to the light valve group corresponding to the pixel group corresponding to the visual area where the light valve group is located.

Furthermore, each pixel of the display device is composed of W sub-pixels for emitting W color lights, each light valve of the light valve array is correspondingly composed of W wavelength sub-apertures, the W wavelength sub-apertures respectively allow only the W color lights to pass through in a one-to-one correspondence, and each sub-pixel corresponds to a wavelength sub-aperture allowing the emitted light to pass through;

and the control unit can control each sub-pixel of the display device to synchronously load the projection information of the sub-aperture opened corresponding to the sub-pixel in the visual area corresponding to the sub-pixel of the scene to be displayed on the sub-pixel at each time point.

Furthermore, the visual area guiding device is a light splitting grating which is arranged between the display device and the light valve array and guides the M pixel groups to respectively project corresponding light information to the M visual areas based on a grating light splitting principle.

Furthermore, the visual area guiding device is a time sequence backlight device, the time sequence backlight device comprises a time sequence light source array and a light converging device, the light converging device is arranged between the time sequence light source array and the display device, M light sources of the time sequence light source array are imaged to M image points in one-to-one correspondence by the light converging device respectively, and projected light of each light source is diffracted by the display device to form a corresponding visual area at the corresponding image point.

Furthermore, the visual area guiding device is a sagittal modulation unit arranged between the display device and the light valve array, the sagittal modulation unit consists of microstructure units corresponding to the pixels of the display device one by one, and each microstructure unit guides the corresponding pixel to project a light beam to a corresponding visual area of a pixel group to which the pixel belongs

Furthermore, the multi-user-facing three-dimensional display system based on entrance pupil division multiplexing also comprises a tracking and positioning unit, wherein the tracking and positioning unit is connected with the control unit and is used for tracking and positioning each light valve group and the position of each light valve in real time and determining the visual area of the position, and the control unit can control the display device to load information according to the visual area of each light valve.

Further, the multi-user-facing three-dimensional display system based on entrance pupil division multiplexing further comprises a baffle for blocking the display device from transmitting light through the non-light valve region into the eyes of an observer.

Further, each light valve is composed of L orthogonal sub-apertures, each corresponding to L orthogonal characteristics, each allowing only light having the corresponding orthogonal characteristic to pass through, and cutting off light having other (L-1) orthogonal characteristics, where L ≧ 2;

the multi-user facing three-dimensional display system based on entrance pupil division multiplexing is arranged in such a way that pixels with interval (L-1) pixels in each pixel group are grouped, the emergent light of the L pixel groups has the L orthogonal characteristics in a one-to-one correspondence mode, and the orthogonal sub-aperture allowing the projection light of each pixel to pass through is the corresponding orthogonal sub-aperture of the pixel;

and the control unit can control each pixel of the display device to synchronously load the projection information of the scene to be displayed, which is opened corresponding to the orthogonal sub-aperture in the visual area corresponding to the pixel, on the pixel at each time point.

Further, each light valve comprises V orthogonal sub-apertures arranged in the same order, wherein each adjacent L orthogonal sub-aperture corresponds to L orthogonal characteristics, each orthogonal sub-aperture only allows light with the corresponding orthogonal characteristic to pass through, and cuts off light with other (L-1) orthogonal characteristics, wherein V ≧ L ≧ 2;

the three-dimensional display system facing multiple users and based on the entrance pupil division multiplexing is arranged in such a way that each pixel group of the display device is divided into V pixel blocks which sequentially correspond to V orthogonal sub-apertures of each light valve according to the spatial arrangement order, projection light of each pixel block is arranged to have orthogonal characteristics corresponding to the corresponding orthogonal sub-apertures, and each pixel takes the corresponding orthogonal sub-aperture of the pixel block as the corresponding orthogonal sub-aperture of the pixel;

and the control unit can control each pixel of the display device to synchronously load the projection information of the scene to be displayed, which is opened corresponding to the orthogonal sub-aperture in the visual area corresponding to the pixel, on the pixel at each time point.

Further, the orthogonality is a linear polarization characteristic perpendicular to each other, an optical rotation characteristic having different handedness, or a wavelength characteristic of complementary colors, or a combination of two or more arbitrary optical rotation characteristics perpendicular to each other, and wavelength characteristics of complementary colors.

Furthermore, each pixel of the display device is composed of W sub-pixels for emitting W color lights, each orthogonal sub-aperture of each light valve of the light valve array is composed of W wavelength sub-apertures, the W wavelength sub-apertures respectively allow only one of the W color lights to pass through in a one-to-one correspondence manner, and each sub-pixel corresponds to a wavelength sub-aperture allowing the emitted light to pass through;

and the control unit can control each sub-pixel of the display device to synchronously load the projection information of the scene to be displayed, which is related to the wavelength sub-aperture corresponding to the sub-pixel, on the optical information of the sub-pixel at each time point, wherein at each time point, the wavelength sub-aperture corresponding to each sub-pixel is in the visual area corresponding to the pixel to which the sub-pixel belongs, and the sub-pixel corresponds to the corresponding wavelength sub-aperture in the opened orthogonal sub-aperture corresponding to the pixel to which the sub-pixel belongs.

The invention utilizes the multi-visual area projection optical engine to accommodate a plurality of users, overcomes focusing-converging conflicts based on monocular multi-view, and builds a three-dimensional display system based on multi-user-oriented natural focusing.

The invention has the following technical effects: the invention realizes a multi-user-oriented light field display system, can project a three-dimensional display scene capable of being naturally focused to each user while accommodating a plurality of users, and effectively improves the visual comfort.

The details of embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of an optical structure of a three-dimensional display system with a spectroscopic grating as a viewing area directing device.

Fig. 2 is a schematic diagram of a principle of implementing monocular natural focusing.

Fig. 3 is a schematic diagram of a part of the optical structure of a three-dimensional display system in which a time sequential backlight device is used as a viewing zone guiding device.

Fig. 4 is a schematic diagram of a portion of the optical structure of a three-dimensional display system with a sagittal modulation element as the viewing zone directing device.

FIG. 5 is a schematic diagram of the operation of a light valve/pixel group pair with a sub-structure of the wavelength molecular aperture

Fig. 6 is a schematic diagram of the operation of a light valve/pixel group pair with orthogonal sub-apertures as sub-structures.

Fig. 7 is a schematic diagram of the operation of another light valve/pixel group pair with orthogonal sub-apertures as sub-structures.

Fig. 8 is a schematic diagram of the operation of a third light valve/pixel group pair with orthogonal sub-apertures as sub-structures.

Detailed Description

The multi-user-faced three-dimensional display system based on entrance pupil division multiplexing can realize the display of naturally focused three-dimensional scenes facing a plurality of users through the combination of a multi-visual-area projection optical engine and a light valve array for guiding more than one view to each eye.

Fig. 1 shows an optical configuration of a multi-user facing three-dimensional display system based on entrance pupil division multiplexing, including a multi-vision region projection optical engine 10, a light valve array 20, and a control unit 30, the multi-vision region projection optical engine 10 including a display device 11 and a vision region guiding device 12. The optical engine 10 for multi-view projection is described by taking an optical engine for multi-view projection based on the principle of grating light splitting as an example, the view area guiding device 12 takes a light splitting grating 121 taking a cylindrical lens as a grating unit as an example, and through the light splitting grating 121, M-5 pixel groups on the display device 11 respectively project light to corresponding M-5 view areas, i.e., view area 1, view area 2, view area 3, view area 4 and view area 5. In fig. 1, the x direction and the y direction are two edge directions of the display device 11, respectively. The x 'direction is the grating unit arrangement direction of the optical splitter grating 121, and the y' direction is the longitudinal direction of the grating units of the optical splitter grating 121, that is, the vertical direction of the grating unit arrangement direction. Each viewing zone receives light information projected from a corresponding pixel group. The arrangement direction of the visual areas, the size of the visual areas and the distance between adjacent visual areas are set to ensure that two eyes of each observer cannot receive light information emergent from the same visual area, namely, in the binocular connecting line direction of the observer, the line degree of each visual area is not more than the difference value between the binocular distance of the observer and the diameter of a monocular pupil, and the distance between adjacent visual areas is not less than half of the sum of the line degree of the visual areas and the diameter of the monocular pupil. The visual area corresponding to the pixel group of each pixel is the visual area corresponding to the pixel. The light valve array 20 is composed of N × K light valves of N light valve groups, where K is the number of light valves included in each light valve group. Each light valve group is respectively used as a lens and worn on the corresponding eye. Fig. 1 exemplifies N-4 and K-3. Specifically, the light valve A_1R1、A_1R2、A_1R3The assembled light valve set 201 is worn in the right eye 501R, light valve A, of observer 1 in viewing zone 1_1L1、A_1L2、A_1L3The assembled light valve block 202 is worn in the left eye 501L of observer 1 in viewing zone 2. Likewise, the sets of valves 204 and 203 in viewing zones 5 and 4 are worn on the left and right eyes, respectively, of observer 2. For clarity of illustrationIn particular, the valve numbers of valve blocks 204 and 203 are not shown. The timing sequence of the time period Δ t formed by K ═ 3 light valves of each group of light valves is controlled by the control unit 30 to be opened, and at one time point, only one light valve in each group of light valves is opened and the other light valves are closed.

In this patent, each viewing zone and its corresponding pixel group have the same structure, and the pixel groups corresponding to different viewing zones are also different from each other in space or time. When the light valve group is arranged in each visual area, the corresponding pixel group is used as an information loading unit, and the same operation is followed for displaying. That is, each pixel group and the group of light valves placed in its corresponding viewing zone are of similar construction, following the same operation. In the following section, only one viewing zone in which a group of light valves is placed and its corresponding pixel group are taken as examples to illustrate how the multi-user facing three-dimensional display system based on entrance pupil division multiplexing realizes its display function.

Taking the light valve set 202 disposed in the viewing area 2 and the pixel group corresponding to the viewing area as an example shown in fig. 1, fig. 2 illustrates how a row of pixels along the y direction in a pixel group projects light information to the corresponding eye 501L through the light valve set disposed in the corresponding viewing area at the time point of t + Δ t/3. Wherein the shutter 60 is configured to block light projected by the display device 10 through the non-light valve area to the eyes of the individual viewer. At this point in time t + Δ t/3, only light valve A_1L2Is opened and the object point P to be displayed is related to the light valve a_1L2The projection point on the display device 11 is a pixel p_2y5Pixel p_2y5Loading of object point P to be displayed with respect to light valve A_1L2Projection information thereon, pixel p_2y5In the sagittal direction p_2y5P projects a beam. More specifically, at the time point of t + Δ t/3, at the light valve A which is opened_1L2Taking a point VP₁Point VP₁A line connecting the object point P to be displayed, and a light passing valve A_1L2Pixel p of pixel group corresponding to the viewing area 2_2y5Then pixel p_2y5Loading information as Point P edge VP₁P direction in the pixel P_2y5The projection information of (2). Here, point VP₁Is selected to satisfy the pixel p_2y5And point VP₁Is connected to the line light valve A_1L2The requirements of (1). The actual scene to be displayed consists of a plurality of object points, and the actual information loading process comprises the following steps: light valve A_1L2When opened, the point VP around it is often taken as the viewpoint, and then the point VP and the light valve A are connected_1L2The viewing area 2 corresponds to any pixel in the pixel group, and the projection information of the scene to be displayed on the any pixel along the connecting line direction is the required loading information of the any pixel. Wherein the obtained light valve A_1L2The spatial position of the neighboring point VP satisfies the following condition: the spot and the light valve A_1L2The connecting lines of the pixels of the pixel group corresponding to the visual area pass through the light valve A_1L2. Here in particular with the opened light valve a placed in view zone 2_1L2For example, it is also applicable to loading information of each pixel corresponding to any opened light valve placed in any viewing zone. This is the operation described in "each pixel is loaded with information as to the light information of the scene to be displayed on that pixel with respect to the projection information of the opened light valve in the corresponding view area of that pixel" on that pixel. The "projection information of the scene to be displayed about the opened light valve in the visual area corresponding to the pixel" refers to the view information of the viewpoint taken by the scene to be displayed in the vicinity of the light valve. The viewpoint of different pixels of a pixel group is often a common point that meets the above requirement and corresponds to the light valve accessory that is opened in the view region, or different points that meet the above requirement and correspond to the light valve accessory that is opened in the view region.

Similarly, at time t, only light valve A_1L1On, pixel p_2y7In the sagittal direction p_2y7P projecting a light beam; at the time point of t +2 Δ t/3, only the light valve A_1L3On, pixel p_2y3In the sagittal direction p_2y3P projects a beam. The light valve interval of the light valve group 202 is set to ensure that at least two light beams passing through the object point P to be displayed are incident on the eye 501L, that is, at least two pieces of view information of the object point P to be displayed are received by the eye 501L, and then the at least two light beams are overlapped at the point P to form a spatial light spot which can be naturally focused by the eye 501L. When the process is established for all points of the scene to be displayed, the focus can be overcome based on the visual retention effectThe three-dimensional scene display of the focus-convergence conflict. For other eyes placed in other visual zones, the three-dimensional scene display capable of focusing naturally is realized by the same method.

In the above process, at a point in time, the operation of loading information for a pixel requires knowledge of the spatial location of each light valve within its corresponding field of view at that time. A tracking and positioning unit 40 is introduced, as shown in fig. 1, to track and position the position of each light valve set and the viewing area thereof in real time, and the control unit 30 controls to load information of each pixel. When attention needs to be paid, when one light valve group receives light projected by more than one pixel group corresponding to an adjacent visual area at the same time, all pixels of the more than one pixel group synchronously load projection information of a scene to be displayed on the pixel of an opened light valve in the light valve group. In the above example, each of the valve groups is disposed on the surface of the corresponding viewing zone. In fact, the above process is also feasible when each light valve group deviates from the surface of the corresponding visual area. Without introducing the tracking and positioning unit 40, a virtual valve set can be assumed and juxtaposed to the position where the actual valve set frequently appears in each viewing zone without knowing the actual spatial position of each valve. Each virtual light valve of the virtual light valve group is set to be synchronously switched with each light valve of each factual light valve group. At each time point in each time period, each pixel loads information which is light information of the projection information of the scene to be displayed on the pixel about the opened virtual light valve in the visual area corresponding to the pixel. When the spatial position of each light valve exceeds the viewing area coverage area projected by the multi-view area projection optical engine 10, for example, when one or more light valve groups exceed the coverage area of the emergent light emitted through the viewing areas 1 to 5 in fig. 1, the control unit 30 may adjust the pixels corresponding to each grating unit to change according to the corresponding relationship between the pixels and the grating units, so as to ensure that the viewing area projected by the multi-view area projection optical engine 10 covers each light valve group. In this case, before and after the adjustment, the same pixel may belong to different pixel groups, that is, there is a common pixel in different pixel groups. At this time, due to the timing before and after modulation, the time points at which the constituent pixels of the different pixel groups including the common pixel load information are different from each other.

Fig. 1 illustrates an optical engine for multi-vision projection based on the principle of grating beam splitting as an example of the multi-vision projection optical engine 10. The multi-view projection optical engine 10 can also perform multi-view projection based on the time division multiplexing principle by using the sequential backlight device 122 converging to different viewing zones as the viewing zone guiding device 12. Such as the sequential backlight device 122 shown in fig. 3, is composed of a sequential light source array 1221 and a light converging device 1222. The time-sequential light source array 1221 shown in fig. 3 has 5 light sources S in M₁、S₂、S₃、S₄And S₅For example, the light converging device 1222 is exemplified by a fresnel lens. Each light source emission light of the time-series light source array 1221 is condensed at each of M-5 viewpoints, VP, by the light condensing device 1222₁、VP₂、VP₃、VP₄And VP₅. The time-sequential light source array 1221 controls each light source by the control unit 30, and emits light in time sequence in each time period consisting of M ═ 5 adjacent time points, and enters the display device 11 as a backlight. Due to diffraction of each pixel of the display device on incident light, each light source projects light through the display device 11, corresponding light information is carried in time sequence and distributed in respective corresponding visual areas due to diffraction effect, and therefore, the display of 5 visual areas, where M, is realized based on time sequence multiplexing: view 1, view 2, view 3, view 4, view 5. Forming the elongated viewing zone, it is possible to design the pixels of the display device 11 to have a large diffraction angle in the long direction of the elongated viewing zone, or to attach scattering films having a large scattering angle in the long direction of the elongated viewing zone through the display device 11, or to take each light source directly as a line light source. In each time period formed by 5 adjacent time points, the light information displayed by the display device 11 can be seen only in one corresponding viewing zone at each time point. Specifically, at the time point t, only the light source S₁Is turned on, and its projection light is converged at a point VP by a light converging device 1222₁. At the same time, the diffraction effect introduced by the information loading of the display device 11 in the beam path causes the light distribution from the display device 11 to spread to the point VP₁In view zone 1. That is, at the time point t, only the optical information loaded on the display device 11 can be seen in the viewing area 1, and at this time, all the pixels of the display device 11 correspond to the viewing area 1. All in oneAt time t + Δ t, only light source S₂Opening to correspondingly form a visual area 2, wherein all pixels of the display device 11 correspond to the visual area 2; at time t +2 Δ t, only light source S₃Opening to correspondingly form a visual area 3, wherein all pixels of the display device 11 correspond to the visual area 3; at time t +3 Δ t, only light source S₄Opening to form a viewing area 4 correspondingly, wherein all pixels of the display device 11 correspond to the viewing area 4; at time t +4 Δ t, only light source S₅And opening to form a viewing area 5, wherein all pixels of the display device 11 correspond to the viewing area 5. When the sequential backlight device 1220 is used, the pixels corresponding to each viewing zone are the same pixels, but their corresponding time points are different from each other. That is, all pixels of the display device are respectively used as M different pixel groups at M adjacent time points, and correspond to different viewing zones. In this case, when a light valve group consisting of K light valves to be opened in time sequence is placed in each viewing area, M × K time points are required to construct a time period with Δ t/K as a time interval. During a time period, each light valve is opened only at one point in time. The time point actually refers to a time period within a time interval range around the time point.

The viewing zone directing device 12 of the multi-view projection optical engine 10 may also be a sagittal modulation unit 123 composed of microstructure units corresponding one-to-one to the respective pixels of the display device 11. Each micro-structure unit, such as a grating structure, of the sagittal modulation unit 123 guides the corresponding pixel to project a light beam to a corresponding viewing area of the pixel group to which the pixel belongs. Fig. 4 illustrates the generation of 4 viewing zones, which are modulated by corresponding microstructure units, and the pixel p₁、p₅… emergent light is guided to visual area 1 to form pixel group corresponding to visual area 1; pixel p₂、p₆…, the emergent light is guided to the visual area 2 to form a pixel group corresponding to the visual area 2; by analogy, the 4 pixel groups project light information to the 4 viewing zones respectively.

Each pixel of the display device 11 is often constituted by a sub-pixel that emits light of W colors. In this case, each light valve of the light valve array 20 may be correspondingly designed to have W wavelength apertures as a substructure, and the W wavelength apertures are correspondingly divided one by oneOnly the W color light is allowed to pass through, and each sub-pixel corresponds to a wavelength sub-aperture allowing the outgoing light thereof to pass through. In this case, the aperture and the corresponding pixel group are divided into W wavelength sub-apertures and W sub-pixel groups for emitting W color lights, respectively, according to the difference in light color. At each time point, the control unit 30 controls each sub-pixel of the display device to synchronously load the projection information of the scene to be displayed on the sub-pixel, which is related to the opened corresponding wavelength sub-aperture in the viewing zone corresponding to the pixel to which the sub-pixel belongs. Similar to the above-mentioned "each pixel loads information as the light information of the projection information of the opened light valve in the corresponding view area of the pixel on the pixel of the scene to be displayed", the change is only to replace the pixel with the sub-pixel and replace the corresponding light valve with the corresponding wavelength sub-aperture. FIG. 5 shows light valve A opened at time t + Δ t/3 in FIG. 2_1L2For example. Which consists of three wavelength molecular apertures a that allow only R (red), G (green), B (blue) color light to pass through, respectively_1L2R、A_1L2G、A_1L2BAnd (4) forming. For clarity of illustration, the sub-structures of the other two light valves belonging to the same group of light valves are not shown. Each pixel of the corresponding display device 11 is composed of a sub-pixel emitting R, G, B color light, for example, p_2y1R、p_2y1G、p_2y1BForm the light valve A_1L2One pixel p of the pixel group corresponding to the viewing zone_2y1R. Then, the light valve A_1L2The R color sub-pixel group formed by the R color photon pixels is emitted from the pixel group corresponding to the visual area, and the projection light can only pass through the sub-aperture A_1L2RLight valve A_1L2The visual area corresponds to a G color sub-pixel group consisting of G color photon pixels. Which projects light only through the sub-aperture A_1L2GLight valve A_1L2The sub-pixel group of B color formed by emitting the sub-pixels of B color in the pixel group corresponding to the visual area, and the projection light can only pass through the sub-aperture A_1L2B. According to the method, each sub-pixel loads corresponding light information, the projection of R, G, B three color views of a scene to be displayed can be realized only through the light valve and the pixel group corresponding to the visual area of the light valve, and the corresponding viewpoints of the light information from the different color views are different. The other light valves operate similarly, thenWhen R, G, B each of the at least one color views is received by the observer's eye 50 through the light valve, the rendering of the colored three-dimensional scene is achieved through monocular multiview. In this case, if the observer's eye 50 is positioned to receive three (R, G, B) color views projected by one light valve, at least one light valve can be used for monocular multiview display, and the timing of the light valves in each light valve set is turned on, so that more R, G, B color views can be projected to the observer's eye 50, thereby improving the display effect, or providing a larger visual area for the observer's eye 50, or providing a larger visual angle for the observer's eye 50.

Further, each of the light valves may have L orthogonal sub-apertures with orthogonal characteristics as a sub-structure. The L orthogonal sub-apertures correspond to L orthogonal characteristics, and each orthogonal sub-aperture allows only light having the corresponding orthogonal characteristic to pass through and cuts off light having the other (L-1) orthogonal characteristics. For example. The mutually perpendicular offset characteristics are L2 orthogonal characteristics, and the red vertical offset characteristics, the blue vertical offset characteristics, the red horizontal offset characteristics, and the blue horizontal offset characteristics are L4 orthogonal characteristics. Fig. 6 illustrates, by way of example, 2 mutually perpendicular line offset characteristics, which are denoted by "", and "-" in the figures. Here, the light valve group 202 disposed in view area 2 and the pixel group corresponding to the view area shown in fig. 1 are also taken as an example for specific description, and for the sake of clarity, other pixel groups on the display device 11 are not shown. Wherein, the light valve A_1L1Comprising L-2 orthogonal sub-apertures A allowing only the passage of "-" and "-" light respectively_1L11And A_1L12Light valve A_1L2Comprising L-2 orthogonal sub-apertures A allowing only the passage of "-" and "-" light respectively_1L21And A_1L22Light valve A_1L3Comprising L-2 orthogonal sub-apertures A allowing only the passage of "-" and "-" light respectively_1L31And A_1L32. In practical systems, the orthogonal nature of the orthogonal sub-apertures can be achieved by placing polarizers at the orthogonal sub-apertures that allow only "-" and "-" light, respectively, to pass. In the above figures, adjacent light valves or adjacent sub-apertures are shown as being disposed in a contiguous seamless arrangement for the sake of illustration onlyThe illustration is clear. In fact, adjacent light valves or adjacent sub-apertures may be partially overlapped, or there may be a gap where a baffle may be placed. In this case, in each pixel group of the display device 11, pixels of each pixel group are grouped at intervals (L-1), that is, the pixels of each pixel group are divided into L pixel groups. The L pixel groups emit light, and are respectively set to have the L different orthogonal characteristics. E.g. pixel p in fig. 6_2y1、p_2y3、p_2y5… combine into a pixel group 1, the pixels of which are "exposed"; pixel p_2y2、p_2y4、p_2y6… are combined into pixel group 2, each pixel of which emits "-" light. Only light valve a is shown in fig. 6_1L2Sub-aperture A of_1L21And A_1L22Turned on t + Δ t/3 time point, pixel group 1 and orthogonal sub-aperture A_1L21Form a pixel group-orthogonal sub-aperture pair, each pixel of the pixel group 1 of the pixel group-orthogonal sub-aperture pair can project light information only through the orthogonal sub-aperture A of the pixel group-orthogonal sub-aperture pair_1L21Out of the orthogonal sub-aperture A not belonging to the pixel group-orthogonal sub-aperture pair_1L22Emitting as a pixel p shown by a dotted line marked with an "x" in the figure_2y17An outgoing light beam; pixel group 2 and orthogonal subaperture A_1L22Forming another pixel group-orthogonal sub-aperture pair, each pixel of the pixel group 2 of the pixel group-orthogonal sub-aperture pair being capable of projecting optical information only through the orthogonal sub-aperture A of the pixel group-orthogonal sub-aperture pair_1L22Out of the orthogonal sub-aperture A not belonging to the pixel group-orthogonal sub-aperture pair_1L21Emitting as a pixel p shown by a dotted line marked with an "x" in the figure_2y18The emergent light beam. In this case, the orthogonal sub-aperture through which each pixel is allowed to project light serves as the pixel-corresponding orthogonal sub-aperture. The control unit 30 controls the pixels of the display device 11 to be loaded with optical information synchronously at each point in time: projection information of the scene to be displayed, which relates to the opened corresponding orthogonal sub-aperture in the visual area corresponding to the pixel, and light information on the pixel. Then, at only one point in time, L-2 views can be projected through one light valve. The other (K-1) time points of a time period are loaded with information in the same wayProjection, through a set of optical valve sets, can realize projection of (L × K) views. When the distance between the orthogonal sub-apertures is small enough to enable the corresponding eyes of the light valve group to receive at least two light beams of any display object point, the display of the natural focusing three-dimensional scene can be realized based on the monocular multiview. L times the views can be projected with the same degree of time multiplexing compared to the case where no orthogonal sub-apertures are used. A larger (L × K) value may allow for a larger eye-to-valve group spacing, or provide a larger effective viewing area for the corresponding eye, or a larger display viewing angle, improving the display effect. The other optical valve groups work in the same way.

In fig. 6, the orthogonal subapertures of the light valves are respectively adjacently positioned. The sub-apertures corresponding to different light valves in the same light valve group can also be arranged in an alternate arrangement. Fig. 7 also illustrates the group of light valves 202 and the corresponding group of pixels disposed in view 2, each light valve is composed of V-4 orthogonal sub-apertures, and all L-2 adjacent sub-apertures thereof correspond to different orthogonal characteristics, respectively. Specifically, the light valve A_1L1Comprising V-4 orthogonal sub-apertures A which in turn permit only the passage of "", "" and "-" light, respectively_1L11、A_1L12、A_1L13And A_1L14(ii) a Light valve A_1L2Comprising V-4 orthogonal sub-apertures A which in turn permit only the passage of "", "" and "-" light, respectively_1L21、A_1L22、A_1L23And A_1L24(ii) a Light valve A_1L3Comprising V-4 orthogonal sub-apertures A which in turn permit only the passage of "", "" and "-" light, respectively_1L31、A_1L32、A_1L33And A_1L34. L-2 orthogonal features are vertically polarized light and horizontally polarized light, respectively, and are denoted by "", and "-". Each orthogonal subaperture is in accordance with A_1L11、A_1L21、A_1L31、A_1L12、A_1L22、A_1L32、A_1L13、A_1L23、A_1L33、A_1L14、A_1L24、A_1L34Are arranged alternately. The orthogonal subapertures of each light valve are arranged regularly along the arrangement direction and have the same orthogonal characteristic in sequence. T shown in FIG. 7At time Δ t/3, only light valve A in the light valve set 202_1L2Sub-aperture A of_1L21、A_1L22、A_1L23And A_1L24Is opened. The view area 2 in which the optical valve group 202 is located corresponds to a pixel group, and is divided into 4 pixel blocks, i.e., a pixel block 1, a pixel block 2, a pixel block 3, and a pixel block 4. Their pixels are arranged to emit "", "" and "-" light, respectively. Along the arrangement direction of the orthogonal sub-apertures, the orthogonal characteristic of the emergent light of each pixel block and the orthogonal characteristic of the orthogonal sub-apertures of each light valve are in one-to-one correspondence in sequence, as shown in fig. 7. At the time point, loading information of each pixel of the pixel block 1 is set as that of the orthogonal sub-aperture A of the scene to be displayed_1L21Projection information on the pixel, each pixel of the pixel block 2 loads information about the orthogonal sub-aperture A of the scene to be displayed_1L22Projection information on the pixel, each pixel of the pixel block 3 loads information about the orthogonal sub-aperture A of the scene to be displayed_1L23Projection information on the pixel, each pixel of the pixel block 4 loads information about the orthogonal sub-aperture A of the scene to be displayed_1L24Projection information on the pixel. In this case, each pixel has the corresponding orthogonal sub-aperture of the pixel block as the corresponding orthogonal sub-aperture of the pixel. The control unit 30 controls the loading information of each pixel of the display device 11 at each time point, and is the light information of the scene to be displayed on the pixel about the projection information of the corresponding orthogonal sub-aperture synchronously opened in the corresponding view area of the pixel. Then, pixel block 1 and orthogonal sub-aperture A_1L21Form pixel block-orthogonal subaperture pairs, the pixel block 1 of which projects light information through its orthogonal subaperture A_1L21Emitting; pixel block 2 and orthogonal subaperture A_1L22Form pixel block-orthogonal subaperture pairs, the pixel block 2 of which projects light information through its orthogonal subaperture A_1L22Emitting; pixel block 3 and orthogonal subaperture A_1L23Form pixel block-orthogonal subaperture pairs, the pixel block 3 of which projects light information through its orthogonal subaperture A_1L23Emitting; pixel block 4 and orthogonal sub-aperture a_1L24Form pixel block-orthogonal subaperture pairs, the pixel block 4 of which projects light information through its orthogonal subaperture A_1L24And (7) emitting. Then at the t + Δ t/3 time point, the orthogonal sub-aperture A is passed_1L21、A_1L22、A_1L23And A_1L24Light valve A on display device 11_1L2The view area 2 projects a view corresponding to 4 pixel blocks of the pixel group. And the other (K-1) time points of one time period carry out information loading and projection in the same way, and the projection of K views can be realized through a group of optical valve groups. When the distance between the sub-apertures of one light valve group is small enough to enable the corresponding eyes of the light valve group to receive at least two light beams of any display object point, the display of the natural focusing three-dimensional scene can be realized based on the monocular multiview. In the structure shown in fig. 5, when V > L, the non-adjacent orthogonal sub-apertures corresponding to the same light valve have the same orthogonal property, such as the orthogonal sub-aperture a_1L21And orthogonal subaperture A_1L23All allowing' light to pass through, orthogonal sub-apertures A_1L22And orthogonal subaperture A_1L24All allow the "-" light to pass through. At this time, the light information projected by the pixel block of a pixel block-orthogonal sub-aperture pair will also be emitted through the orthogonal sub-aperture of the non-pixel block-orthogonal sub-aperture pair, which affects the display effect as noise. For example, in FIG. 7, pixel block 1 is projected through orthogonal sub-aperture A_1L23The emergent light is noise, such as the marked light beam. According to the arrangement of the orthogonal sub-apertures shown in fig. 5, the orthogonal sub-apertures having the same orthogonal characteristic are spaced by (K × L) orthogonal sub-apertures in the orthogonal sub-apertures of one light valve. When the optical structure shown in fig. 7 is adopted in the multi-user-oriented three-dimensional display system based on entrance pupil division multiplexing, a sufficiently large (K × L) value needs to be designed to ensure that the noise can avoid the corresponding eyes of the light valve group. The configuration shown in fig. 7 may allow for greater eye-to-valve set spacing, or allow for a greater viewing angle.

When each pixel group is divided into different V pixel blocks, the orthogonal sub-apertures of each light valve may be arranged adjacent to each other, as shown in fig. 8. In this case, V orthogonal subapertures corresponding to each light valve must have different orthogonal characteristics, i.e., V ═ L. Fig. 8 illustrates an example where V ═ L ═ 2.

In each of the above figures, the light valves and the V ═ L subapertures are shown in the arrangement direction along the y direction. In fact, their arrangement direction may be in any direction.

When each pixel of the display device 11 is constituted by a sub-pixel that emits W color light, each of the orthogonal sub-apertures may be further constituted by W wavelength sub-apertures that respectively allow only the W color light to pass therethrough in one-to-one correspondence. The sub-pixels emitting the same color light on each pixel block form sub-pixel blocks, for example, the sub-pixels emitting R color light on the pixel block form R color sub-pixel blocks. For a pixel block-orthogonal subaperture pair, the pixel block is used for replacing the pixel group in fig. 5, the orthogonal subaperture is used for replacing the light valve in fig. 5, and information loading is carried out based on the process described in fig. 5. Then, a sub-pixel block emitting light of different colors in one pixel block-orthogonal sub-aperture emits light information through each different wavelength sub-aperture of the orthogonal sub-aperture. Each pixel block-orthogonal sub-aperture operates identically, increasing the number of projection views by the introduction of a wavelength sub-aperture. Wherein each sub-pixel corresponds to a wavelength sub-aperture allowing its outgoing light to pass through. The control unit 30 controls each sub-pixel of the display device 11 to synchronously load the light information of the projection information of the scene to be displayed on the sub-pixel, which is related to the wavelength sub-aperture corresponding to the sub-pixel, on the sub-pixel at each time point, wherein at each time point, the wavelength sub-aperture corresponding to each sub-pixel is in the viewing area corresponding to the pixel to which the sub-pixel belongs, and the sub-pixel corresponds to the corresponding wavelength sub-aperture in the opened orthogonal sub-aperture corresponding to the pixel to which the sub-pixel belongs.

In the embodiments described above, the light valves are shown in an adjacent arrangement. In practice, there may be gaps between adjacent light valves, or overlap may occur. The non-light valve areas on the side of the light valve may be designed to be opaque to prevent passage of light information projected by the display device 11. The ambient light information from the outside can be incident through the opened light valve or various sub-apertures thereof, so that the spatial superposition of the displayed scene and the ambient light information is realized. When the light valves or the various sub-apertures thereof do not utilize the polarization state characteristics, the light information projected to each light valve by the display device 11 may be designed to have a certain polarization state, such as a left-handed polarization state. In this case, the non-light valve area on the light valve surface may be designed not to be completely opaque, but not to allow the polarized light projected by the display device 11 to pass through, but to allow other polarized light to pass through, so as to increase the incident light flux of the external ambient light. The light valve sets can also be designed in various shapes, such as the shape of a contact lens, and especially when one light valve set only comprises one light valve consisting of W wave sub-apertures, the elimination of the electric driving device required by the time sequence switch can make the W wave sub-apertures more easily arranged close to the pupils of the observer in the shape of the contact lens.

The core idea of the invention is to introduce a time-sequential light-switching light valve to a multi-view projection engine to build a three-dimensional display system which presents a naturally focused three-dimensional scene to a plurality of users. And further through the design of the sub-aperture of the light valve, the display effect of the light valve is improved. The above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept fall within the scope of the present invention. For example, various conventional multi-vision projection optical structures can be used as the multi-vision projection optical engine of the present patent. Accordingly, all relevant embodiments are within the scope of the present invention.