WO2022028448A1

WO2022028448A1 - Geometrical holographic display system with optimized display configuration

Info

Publication number: WO2022028448A1
Application number: PCT/CN2021/110462
Authority: WO
Inventors: 王广军; 余为伟
Original assignee: 荆门市探梦科技有限公司
Priority date: 2020-08-06
Filing date: 2021-08-04
Publication date: 2022-02-10

Abstract

A geometrical holographic display system with an optimized display configuration. The system comprises: at least one projector (1), a geometrical holographic screen (2), a support structure (3) that provides support for the projector (1) and the geometrical holographic screen (2), and a controller (4) electrically connected to the projector (1), wherein for a preset number of viewpoints, the effective projection area of the geometrical holographic screen (2) is SP ㎡, the area of a single viewpoint is SL ㎡, and an optical path distance between the center of the outermost lens of any single projector (1) and the center of the geometrical holographic screen (2) in a working state is L meters, such that the effective viewing solid angle of each viewpoint meets: Global optimization and constraint are performed on components of the entire system, such that the display system is always within the optimal configuration interval, the costs are controlled, and the optimal comprehensive performance of the display system can also be realized.

Description

Geometric holographic display system with optimized display configuration

This application is required to be submitted to the China Patent Office on August 06, 2020, the application number is 202021615859.0, the name of the invention is "reflective geometric holographic display system with optimized display configuration", and the application number is submitted to the China Patent Office on August 6, 2020. 202021626926.9, the priority of the Chinese patent application entitled "Transmission Geometric Holographic Display System with Optimized Display Configuration", the entire contents of which are incorporated herein by reference.

technical field

The utility model relates to the field of 3D display, in particular to a geometric holographic display system with optimized display configuration.

Background technique

In recent years, 3D display technology has become very popular, and more and more research institutions have begun to invest in the research and development of 3D display technology. But so far, few can really come close to the holographic display scheme in science fiction movies. Most of them only use the stereo image pair scheme with a very low technical threshold to realize the pseudo 3D display, and the viewing experience is not ideal.

A new holographic display scheme is proposed in the patent of transmission type geometric holographic display system with publication number CN111338175A. A reflective geometric holographic display system patent with publication number CN111338177A proposes a new holographic display scheme. These two schemes have been able to realize the reproduction of real 3D images in display principle, which can make users watch the display screen in the way of viewing the real physical world, which is a very ideal 3D display scheme. However, it is currently in the early stage of technological development, and the accumulation of technology is relatively small. Therefore, although it is very ideal in the display principle, it is often difficult to fully maximize its advantages in practical applications due to the limitations of the designer's knowledge. This new display form is very different from the previous flat-panel displays such as LCD and glasses-like display devices in terms of display principle and display form. Therefore, the design skills/rules of traditional display systems cannot be used for reference in new display systems. This brand-new display system involves the mutual cooperation between multiple display components, especially the mutual cooperation between its projector (such as a holographic projector), a geometric holographic screen and a follow-up motion mechanism of the window. In practical applications, it is very difficult to determine how to select the aperture of the projector, how to set the corresponding geometric holographic screen, and how to reserve the tracking motion space during the tracking process. If the coordination relationship between the various components of the system is not handled properly, it will often result in the over-design of one component and the under-design of another component, resulting in a high cost of the system but an unsatisfactory display effect. Because the structure of projectors (especially holographic projectors) is much more complicated than ordinary projectors, the cost is very high, and geometric holographic screens also require micron-level processing technology to produce decimeter or even meter-level screens. , its cost is also high, so no matter which part of the two has been designed, it will cause a lot of cost waste, and similar to the barrel principle, the performance potential of the system is restricted by the "short board" components, so it is impossible to Get the best performance out of it. In addition, if the design of the window following movement is unreasonable, it is very easy to cause the situation to be lost, which will greatly affect the user experience.

To sum up, it is difficult for ordinary designers to grasp this kind of system when designing. Although the system can be built in principle, it is often difficult to handle the relationship between the various characteristic parameters. When designing, the designer sometimes pursues a large viewing window unilaterally, which makes the system aberrations extremely large and the image quality is limited. The field of view is wasted or does not match the application scene, and the high resolution of the imaging element cannot be reasonably utilized. The prototypes produced in this way often cannot make the display system exert the best display performance, but instead magnify some avoidable inherent shortcomings, resulting in extremely poor user experience.

SUMMARY OF THE INVENTION

In order to solve or partially solve the deficiencies of the prior art, a method for optimizing display configuration is provided. Through global optimization constraints on each component of the entire system, the display system can always be in the optimal configuration range, and the cost can be controlled at the same time. Optimize the overall performance of the display system.

A geometric holographic display system with an optimized display configuration, wherein the geometric holographic display system with an optimized display configuration includes at least one projector (1) for projecting picture information in space, a geometric holographic screen (2), the position of which is the same as that of all Corresponding to the projector (1), a support structure (3) providing physical structural support for the projector (1) and the geometric holographic screen (2), and a control unit electrically connected to the projector (1) The device (4), the geometric holographic display system of the optimized display configuration further includes:

A preset number of viewpoints, the area of a single viewpoint is SL m ² , the effective projection area of the geometric holographic screen (2) is SP m ² , and the center of the outermost lens of the single projector (1) and the geometric holographic screen (2) ), the optical path distance between the centers is L meters, and the effective viewing solid angle of each viewpoint satisfies:

In one embodiment, when the geometrical holographic screen (2) comprises a transmissive geometrical holographic screen (5), the position of the transmissive geometrical holographic screen (5) corresponds to the projector (1) for Optically transforming the picture on one side to the other side to form an optical conjugate image; the effective projection area of the transmissive geometric holographic screen (5) is SP m ² , and the center of the outermost lens of the single projector (1) The optical path distance from the center of the transmissive geometric holographic screen (5) is L meters.

In one embodiment, the ratio of the maximum value LMAX to the minimum value LMIN of the optical path distance L between the center of the outermost lens of the single projector (1) and the center of the transmissive geometric holographic screen (5) satisfy:

In an embodiment, the effective projection area SP m ² of the transmissive geometric holographic screen (5) ranges from 0.005 to 1.5 m ² .

In one embodiment, the optical path distance L meters between the center of the outermost lens of the single projector (1) and the center of the transmissive geometric holographic screen (5) ranges from 0.1 to 10 meters.

In one embodiment, the geometric holographic display system of the optimized display configuration further comprises at least one first optical path folding mirror group (6) arranged on one side or both sides of the transmissive geometric holographic screen (5), The first optical path folding mirror group (6) includes at least one plane mirror with a reflective function, which is used to change the propagation path of the light projected by the projector (1).

In one embodiment, the first optical path folding mirror group (6) is connected to the support structure (3).

In an embodiment, when the geometric holographic screen (2) includes an auxiliary imaging screen (7) and a reflective geometric holographic screen (8), the auxiliary imaging screen (7) is used for light splitting, and the reflective geometric holographic screen (8) is used for light splitting. The screen (8) is located on one side of the auxiliary imaging screen (6) or on both sides of the auxiliary imaging screen (7) respectively; the effective projection area of the auxiliary imaging screen (7) is SP m ² , and the single The optical path distance between the center of the outermost lens of the projector (1) and the center of the auxiliary imaging screen (7) is L meters.

In one embodiment, the ratio of the maximum value LMAX to the minimum value LMIN of the optical path distance L between the center of the outermost lens of the single projector (1) and the center of the auxiliary imaging screen (7) satisfies:

In an embodiment, the effective projection area SP m ² of the auxiliary imaging screen (7) ranges from 0.005 to 1.5 m ² .

In one embodiment, the optical path distance L meters between the center of the outermost lens of the single projector (1) and the center of the auxiliary imaging screen (7) ranges from 0.1 to 10 meters.

In one embodiment, the geometric holographic display system of the optimized display configuration further comprises at least one second optical path folding mirror group ( 9).

In one embodiment, the second optical path folding mirror group (9) is connected to the support structure (3).

In an embodiment, the range of the single-viewpoint area SL m ² is 0.000004-0.5 m ² .

In one embodiment, the support structure (3) is a deformable and/or movable structure and is electrically connected to the controller (4).

In one embodiment, the geometric holographic display system with optimized display configuration further comprises an interactive motion capture unit (10) electrically connected to the controller (4), and the interactive motion capture unit (10) is used to identify the user and sends the user interaction action information to the controller (4), and the controller (4) adjusts the display screen content according to the received user interaction action information obtained by the interaction action capture unit (10).

In one embodiment, the geometric holographic display system with optimized display configuration further comprises an eye tracking unit (11) electrically connected to the controller (4), and the eye tracking unit (11) is used for tracking people. The position of the eye and the positioning information of the human eye are sent to the controller (4), and the controller (4) controls the The support structure (3) makes corresponding action responses to adjust the spatial position of each part of the display system, so that the user's eyes are always in the visual space of the system.

Compared with the prior art, the advantages of the present utility model are:

The projector, geometric holographic screen and supporting structure are globally optimized, so that the display system can always be in the optimal configuration range, and the overall performance of the display system can be optimized while controlling the cost;

A reasonable effective viewing solid angle can avoid the situation that the effective viewing solid angle is too small and the 3D performance is poor, and the aberration that occurs in pursuit of an excessively large solid angle can not maximize the display capability of the system.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments described in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of the system of the present invention including a projector 1 when the geometric holographic screen 2 includes a transmissive geometric holographic screen 5;

2 is a schematic diagram of the system of the present invention including two projectors 1 when the geometric holographic screen 2 includes a transmissive geometric holographic screen 5;

3 is a schematic diagram of the system of the present invention in which a first optical path folding mirror group 6 is added on the same side of the projector 1 on the basis of FIG. 1 ;

Fig. 4 is on the basis of Fig. 3, on the other side of the transmissive geometric holographic screen 5 has added a first optical path folding mirror group 6 of the present utility model system and optical path schematic diagram;

FIG. 5 is a system schematic diagram of an interactive motion capture unit 10 and an eye tracking unit 11 added on the basis of FIG. 1 ;

6 shows the effective projection area SP of the transmissive geometric holographic screen 5 related to the effective viewing solid angle in the display system, the area SL of the light-transmitting part of the outermost lens of the projector 1, and the center of the outermost lens of the projector 1 and the transmissive geometric holographic screen Schematic diagram of the optical path distance L between the centers of 5;

7 is a schematic diagram of the optical path distance L of the display system including the first optical path folding mirror group 6;

8 is a system schematic diagram and an optical path diagram of the present invention in which the projector 1 and a reflective geometric holographic screen 8 are located on the same side of the auxiliary imaging screen 7;

9 is a system schematic diagram and an optical path diagram of the present invention in which the projector 1 and a reflective geometric holographic screen 8 are located on both sides of the auxiliary imaging screen 7;

10 is a system schematic diagram and an optical path diagram of the present utility model in which two reflective geometric holographic screens 8 are respectively located on both sides of the auxiliary imaging screen 7;

FIG. 11 is a schematic diagram of a system with an interactive motion capture unit 10 and an eye tracking unit 11 added on the basis of FIG. 8 ;

12 is a schematic diagram of the system of the present invention with a second optical path folding mirror group 9 added to the same side of the projector 1 on the basis of FIG. 8 ;

13 is a schematic diagram of the system of the present invention in which a second optical path folding mirror group 9 is added to the other side of the auxiliary imaging screen 2 on the basis of FIG. 12;

14 is a schematic diagram of the system of the present invention including a plurality of projectors 1 when the geometric holographic screen 2 includes an auxiliary imaging screen 7 and a reflective geometric holographic screen 8;

15 shows the effective projection area SP of the auxiliary imaging screen 7 related to the effective viewing solid angle in the display system with only one viewpoint, the single viewpoint area SL, that is, the area of the light-transmitting part of the outermost lens of the projector 1 and the center of the outermost lens of the projector 1 A schematic diagram of the optical path distance L between the center of the reflective geometric holographic screen 8;

FIG. 16 is a schematic diagram of the optical path distance L of the display system including the second optical path folding mirror group 9 .

Among them, the reference numerals are as follows:

Projector 1, geometric holographic screen 2, support structure 3, controller 4, transmissive geometric holographic screen 5, first optical path folding mirror group 6, auxiliary imaging screen 7, reflective geometric holographic screen 8, second optical path folding mirror group 9. Interactive motion capture unit 10 , human eye tracking unit 11 .

detailed description

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any protection scope of the present invention. restrictive effect.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. Based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying the indicated device or Elements must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

1 to 7, the present invention provides a geometric holographic display system with optimized display configuration, comprising at least one projector 1, a geometric holographic screen 2, a support structure 3 and a controller 4;

The projector 1 is used to project picture information (picture information with depth) in space, and the present invention can directly use the holographic projector as the projector 1 to realize 3D display.

The projector 1 can also use a common projection device capable of projecting a two-dimensional picture, so as to project a two-dimensional picture on a certain focal plane in the space, and then adjust the depth of field and the picture content of the two-dimensional picture through the controller 4 (presenting a 2D picture). The content of the picture can also show the real sense of distance between the picture and the user, which is obviously different from the ordinary projection display system. The ordinary projection display system can only display the picture on a fixed plane, so the picture has no depth information expression effect. ), the process of adjusting the depth of focus in the actual work process can be real-time or it can be adjusted at intervals according to the content of the screen (usually, the overall depth of field of the film or other video is maintained at the same level for a period of time. When the scene is switched, there will be a large jump in the depth of field of the screen).

The projector 1 can also use the holographic projection equipment of two-dimensional picture groups in different depths of field to realize 3D display. For example, the optical design of ordinary projection equipment can be further carried out, so that 3D can be realized on the basis of using a single projector. For display, you can refer to an all-solid-state holographic projector with application number 202010029144.5, which is a technical solution for realizing three-dimensional screen display by adding some optical elements inside the projector for optical design, which is not specifically limited here.

The geometric holographic screen 2 can be a transmissive geometric holographic screen 5, which is a screen with a converging image point on one side to form a conjugate image point on the other side, the position of which corresponds to the projector 1, and is used for the projector. 1. The projected image is converted to an optical conjugate position relative to the transmissive geometric holographic screen 5, and its function is to convert the divergent picture projected by the projector 1 to the window position for the user to watch, preferably a flexible holographic screen, In this way, a scrolling screen or a folding screen can be made, so that the whole system is more compact and portable. Of course, a rigid screen can also be used for suitable occasions.

When a 2D picture needs to be displayed compatibly, the transmissive geometric holographic screen 5 can be replaced by a common projection screen, such as a common rear projection screen.

The support structure 3 is matched with the projector 1 and the transmissive geometric holographic screen 5 respectively, and provides physical structural support for the two. Specifically, the support structure 3 can be made into a support frame with a fixed structure. At this time, the display of the present invention The system as a whole is fixed, and users need to be in a fixed position to observe the screen.

The controller 4 is electrically connected to the projector 1 , and the projector 1 can adjust the depth of field and the content of the projected image according to the control signal of the controller 4 .

In order to increase the flexibility of the display system, the support structure 3 is set as a structure that can move and/or deform, and the support structure 3 is electrically connected with the controller 4, and the support structure 3 makes corresponding actions according to the control information of the controller 4, Thereby, the relative movement and/or the overall movement between the projector 1 and the transmissive geometric holographic screen 5 is realized, so that the visual window of the system always covers the user's eyes, so that the user can view the screen normally in different directions. It should be noted that The support structure 3 is a general prior art, and those skilled in the art can design it by themselves according to the space conditions of the practical application, such as: using some hinge structures and structures similar to the umbrella shaft or the umbrella rib, those skilled in the art can design it very easily A structure that meets the requirements is not limited here.

As shown in Fig. 5, as a preferred solution, the holographic display system of the present invention further includes an interactive motion capture unit 10 electrically connected to the controller 4, and the interactive motion capture unit 10 is used to identify the user's interactive action and record the user's interactive action information. It is sent to the controller 4, and the controller 4 adjusts the content of the displayed screen according to the user interactive action information obtained by the received interactive action capture unit 10, so as to realize the interactive action between the user and the screen. Specifically, the camera can be combined with machine vision technology to identify the user's Gesture actions are used to obtain user interaction information, thereby controlling the movement and/or deformation of the support structure 3, thereby adjusting the spatial position and posture of each component of the system. The controller 4 can also capture the user interaction action information obtained by the unit 10 according to the received interaction action It can adjust the content of the displayed screen in real time and realize the interaction between the user and the screen, such as controlling the screen to pan according to the pan gesture signal, or controlling the zooming in, zooming in, pushing away, touching and other operations of the screen according to other corresponding interactive actions.

The setting of the interactive motion capture unit 10 has positive significance for the application scenario in which the spatial position of the user relative to the display system is fixed, similar to the wearable application.

In addition, for the application scenario in which the spatial position of the user relative to the display system changes in real time, an eye tracking unit 11 that is electrically connected to the controller 4 needs to be set up. The eye tracking unit 11 is used to track the position of the human eye and locate the human eye. The information is sent to the controller 4, and the controller 4 controls the support structure 3 to make corresponding action responses according to the received eye positioning information obtained by the eye tracking unit 11 to adjust the various components (projector 1, transmission geometry The spatial position of the holographic screen 5 and the first optical path folding mirror group 6) makes the user's eyes always in the visible space of the system, so that the user's eyes can always receive projection information even in a moving state and watch the picture normally.

In practical applications, the human eye tracking unit 11 and the interactive motion capture unit 10 can be integrated in the same device, for example, a machine vision camera device is used.

As shown in FIG. 3 and FIG. 4 , in order to further improve the flexibility of the system, a first optical path folding mirror group 6 can also be provided on one side or both sides, and the first optical path folding mirror group 6 is also connected to the support structure 3. The first optical path The folding mirror group 6 includes at least one mirror, so that the imaging optical path can be adjusted so that it can adapt to various application space scenarios. For the holographic display system including the first optical path folding mirror group 6, the relative or overall movement of the projector 1, the transmissive geometric holographic screen 5 and the first optical path folding mirror group 6 can be controlled simultaneously through the support structure 3, thereby Real-time adjustment to ensure that users can watch normally.

The display system of the present invention includes several viewpoints, the area of any single viewpoint is SLm ² , the effective projection area of the transmissive geometric holographic screen 5 is SP m ² , the center of the outermost lens of the single projector 1 and the transmissive geometric holographic screen 5 The optical path distance between the centers is L meters, and the effective viewing solid angle of each viewpoint satisfies:

For the explanation of the related concept of viewpoint, please refer to the transmission type geometric holographic display system with publication number CN111338175A.

The preferred range of the effective projection area SP m ² of the above-mentioned transmissive geometric holographic screen 5 is 0.005-1.5 m ² , specifically the maximum horizontal projection area of the transmissive geometric holographic screen 5, which can also be directly placed on a plane. area to calculate. In actual design, the regular shape can be directly calculated by geometric relationship. For example, the rectangular screen can be directly calculated by the length and width, etc. For special-shaped screens and curved screens, it is difficult to directly calculate the area. It can be placed on a plane according to the coverage area is calculated.

The single viewpoint area SL m ² preferably ranges from 0.000004 to 0.5 m ² , and the single viewpoint area should correspond to the area of the light-transmitting part of the outermost lens of the projector 1. Take one projector 1 providing one viewpoint or multiple viewpoints as an example to illustrate:

As shown in FIG. 6 , when the projector 1 provides a viewpoint, the single viewpoint area SL is equal to the area of the light-transmitting portion of the outermost lens of the projector 1 .

When the projector 1 provides two viewpoints, the single viewpoint area SL is equal to half of the area of the light-transmitting portion of the outermost lens of the lens of the projector 1 .

Similarly, when N viewpoints are provided, the single viewpoint area SL is equal to 1/N of the area of the light-transmitting portion of the outermost lens of the lens of the projector 1 , and N is preferably 1-6.

The calculation method for the area of the light-transmitting portion of the outermost lens of the projector 1 is the same as the calculation method for the effective projection area of the transmission-type geometric holographic screen 5 .

The preferred range of the optical path distance L between the center of the outermost lens of the single projector 1 and the center of the transmissive geometric holographic screen 5 is 0.1 to 10 meters, and in the working state, the center of the outermost lens of the single projector 1 and the transmissive geometric hologram The ratio of the maximum value L _MAX to the minimum value L _MIN of the optical path distance L between the centers of the screen 5 should satisfy:

At this time, the tracking range can be more matched with the user's motion range; further, in order to match the user's range of activities in indoor scenes such as office, the

When designing, the distance between the center of the outermost mirror surface and the center of the transmissive geometric holographic screen 5 can be measured by a soft ruler. For the display system containing the first optical path folding mirror group 6, a layer of the first optical path folding mirror group 6 can be covered. Light-absorbing film (such as black paper), a small hole is set on the film, so that only the position of the small hole can reflect light, and other positions cannot reflect light. By moving the light absorbing film to change the position of the small hole, the action point of the light emitted from the center of the outermost lens of the projector 1 and finally irradiated on the center of the transmissive geometric holographic screen 5 on each lens of the first optical path folding mirror group 6 can be found , in this way, the optical path distance in the process can be measured. Of course, the optical path distance L can also be directly calculated according to the geometric relationship. Based on the above test method, for the display system containing the first optical path folding mirror group 6, L is as shown in the figure The sum of L1 and L2 shown in 7.

It should be noted that, since the display system needs to continuously adjust the window position according to the user's eye position when working (when projecting a 3D image to the user), L is not a fixed value, but a range, so it is necessary to ensure this range during design. Any value of L in the interior satisfies the above formula; it should be noted that L is the geometrical relationship size during the working process, that is, the system normally provides the user with the characteristics of the display content state, when it is in the non-working state or in the storage state, the value of L is The value does not need to satisfy the constraints of the formula.

Of course, L can be set to a fixed value for wearable/fixed applications.

The principle of the effective viewing solid angle design rule is briefly explained below: the holographic display system realizes the screen display by means of light field reconstruction, and can reproduce the stereoscopic image with depth information. However, only showing depth information is not enough to provide enough visual impact. In many application scenarios, a certain effective viewing solid angle is required to enable users to get a better experience. In order to pursue the ultimate 3D visual experience and make the virtual display content achieve the same optical effect as the real world, it is necessary to provide a solid angle of about 5.2 steradian. Usually, the application in the life scene generally needs more than 0.7 steradian to show a comfortable 3D image. For some special scenes, such as the driving navigation scene or the virtual and real object fusion display scene in the XR scene, etc., when the user's gaze area is relatively concentrated , the effective viewing solid angle is greater than 0.0076 to meet the needs of use. To sum up, the display solid angle of a single viewpoint needs to be set between 0.0076 and 5.2.

For the display system of the present invention, the ideal configuration angle between the line between the center of the projection lens and the center of the transmissive geometric holographic screen 5 (principal ray) and the transmissive geometric holographic screen is 45°. It follows the movement of the user, so it cannot always maintain the ideal configuration angle, and the included angle will be smaller under certain working conditions, so it is necessary to take into account the immersion in these situations when designing. When the angle between the main ray and the transmissive geometric holographic screen 5 is 35°, if a certain sense of immersion can be guaranteed, the overall user experience of the system will be very good. This conclusion has also been confirmed by experiments and user experience feedback. Under this configuration, the effective light field control area of the transmissive geometric holographic screen can be approximated by SP · sin (35°). Considering that the window itself has a certain size, it is necessary to deduct the area SL occupied by the window itself for correction, and then divide by the window ( A very accurate approximation of the display effective viewing solid angle of the actual display system can be calculated from the distance between the center of the outermost mirror surface of the projector and the center of the transmissive geometric holographic screen 5 .

Describe below in conjunction with embodiment, specifically see Table 1:

Table 1

The above embodiments provide some ideal configuration modes. Although all dimensions in the above embodiments are in meters (m), it is not limited to use only these dimension values. In practical applications, geometric similarity is considered, and all dimensions are scaled as a whole, or any other dimensions are combined to form a sum of The embodiment is similar to the solid angle, and the display effect thereof will also be consistent without obvious change. In fact, the actual test has also been carried out on the overall scaling range of 0.001 to 1000 times and other different size combinations in some embodiments. As long as the effective viewing solid angles are similar, the user experience does not feel the difference between different sizes. The difference further shows that the implementation size is not the key factor affecting the effect, but the effective viewing solid angle is.

Practical applications can be further optimized according to the application scenario:

(1) For desktop application scenarios:

In the office scene, the requirements for the effective viewing three-dimensional angle are low, preferably 0.2 to 0.6. At this time, it can show a good three-dimensional effect, and at the same time have a certain sense of immersion, which can meet the office needs under most conditions.

In the game entertainment scene, the effective viewing solid angle is preferably 0.6 to 0.8, which can show a good three-dimensional effect and further enhance the immersion.

In application scenarios such as design, research and development, and simulation, the effective viewing solid angle is preferably 0.8 to 1.2. At this time, the stereo effect and immersion are further improved, and it has the effect of connecting with the physical world.

(2) For wearable application scenarios:

For the glasses-type auxiliary display scene, the effective viewing solid angle of the effective display of each viewpoint is further preferably 1.2-2.2, so as to provide a sufficient sense of immersion.

For the head-mounted/wearable audio-visual application scenario, the effective viewing solid angle of each viewpoint is further preferably 2.2 to 3.4. At this time, the display solid angle is larger and the immersion is stronger.

For head-mounted/wearable game application scenarios, the effective viewing solid angle of each viewpoint is further preferably 2.5-3.8, and the sense of immersion can be further enhanced at this time.

(3) For remote operation application scenarios:

For remote control of the robot for surgical scenes, the effective viewing solid angle of each viewpoint is further preferably 3 to 4. At this time, the performance of the on-site optical environment is more realistic.

For remote control of robots for field search and rescue operations, the effective viewing solid angle of each viewpoint is further preferably 4 to 5.2, which can simulate the real environment to a great extent and create an immersive feeling.

For a projector that only provides one viewpoint, the SL is preferably between 0.000004m ² and 0.0025m ² (4 square millimeters to 25 square centimeters). This range can ensure that the projector can be fully Possibly small.

In the case where one projector provides two viewpoints, the light-transmitting area of the outermost lens is preferably between 49 square centimeters and 100 square centimeters, which can ensure that the projector is not particularly bulky.

Also, for desktop application scenarios:

The SP is preferably between 0.04 square meters and 1.2 square meters, and the L is preferably between 0.2 and 1 meter. At this time, the balance between the optimal desktop space occupation and the effective viewing solid angle can be achieved.

For mobile terminal application scenarios:

The SP is preferably 0.02 square meters to 0.16 square meters, and the L is preferably between 0.1 and 0.6 meters. At this time, the portability balance can be better taken into account. Further, the holographic screen can be made into a foldable or scroll type.

For wearable application scenarios:

The SP is preferably 4 square centimeters to 50 square centimeters, and the L is preferably between 5 and 12 mm, which can better meet the wearing needs. Further, it can be set that two glasses share the same transmission type geometric holographic screen or a transmission type geometric holographic screen is separately set for each glasses, for the case where each glasses are provided with a transmission type geometric holographic screen separately, SP is preferably set. It is more suitable to be between 4cm ² and 12.8cm ² , and it is more suitable for the SP of two glasses to share the same transmissive geometric holographic screen, preferably between 28cm ² and 50cm ² .

8 to 16, the present utility model provides a reflective geometric holographic display system with an optimized display configuration, comprising at least one projector 1, a geometric holographic screen 2, a support structure 3 and a controller 4;

The projector 1 is used to project picture information in space, and the present invention can directly use the holographic projector as the projector 1 to realize 3D display.

The projector 1 can also use a common projection device capable of projecting a two-dimensional image, so as to project a two-dimensional image on a certain focal plane in space, and then adjust the depth of field and image content of the two-dimensional image through the controller 4 .

The geometric holographic screen 2 may include an auxiliary imaging screen 7 and a reflective geometric holographic screen 8. The auxiliary imaging screen 7 is used for light splitting, preferably a semi-transparent and semi-reflective film. Reflected on the reflective geometric holographic screen 8, through the modulation of the light by the reflective geometric holographic screen 8, any light irradiated on the reflective geometric holographic screen 8 is retroreflected and returned to the original direction, and the retroreflected light is partially transmitted through the auxiliary The imaging screen 7 then forms an off-screen projection image in the air.

The reflective geometric holographic screen 8 is used to retro-reflect the incident light rays from other angles that are not parallel to the cross section. These rays can be retro-reflected after being offset by a distance of d mm, where d is the outgoing light and the reflective geometry. The distance from the intersection of the incident surface of the holographic film to the incident light, d≤1 mm, is preferably a flexible holographic screen, and the number of reflective geometric holographic screens 8 is one or two.

When there is one reflective geometric holographic screen 8 , it is arranged on any side of the auxiliary imaging screen 7 .

When the number of reflective geometric holographic screens 8 is two, they are respectively arranged on both sides of the auxiliary imaging screen 7. When the display system includes two reflective geometric holographic screens 8, the light energy utilization rate and imaging quality of the system are high. .

Preferably, the interior of the reflective geometric holographic screen 8 is provided with a series of pentagonal columnar primitive prisms whose cross-sections are right-angled triangles or a combination of rectangles and right-angled triangles. For specific structures and retroreflection principles, please refer to the reflective type with publication number CN111338177A The geometric holographic display system will not be repeated here.

The support structure 3 is respectively matched with the projector 1, the auxiliary imaging screen 7 and the reflective geometric holographic screen 8 to provide physical structural support for the three. Specifically, the support structure 3 can be made into a support frame with a fixed structure. At this time, The overall display system of the utility model is fixed, and the user needs to be in a fixed orientation to observe the screen.

In order to increase the flexibility of the display system, the support structure 3 is set as a structure that can move and/or deform, and the support structure 3 is electrically connected to the controller 4, and the support structure 3 makes corresponding actions according to the control information of the controller 4, Thereby, the relative movement and/or the overall movement between the projector 1, the auxiliary imaging screen 7 and the reflective geometric holographic screen 8 is realized, so that the visual window of the system always covers the user's eyes, so that the user can be normal in different directions. Looking at the picture, it should be noted that the support structure 3 is a general prior art, and those skilled in the art can design it by themselves according to the space conditions of the actual application, such as: using some hinge structures and structures similar to the umbrella shaft and/or the umbrella rib can It is very easy to design a deformable structure, which is not specifically limited here.

As shown in FIG. 11 , as a preferred solution, the holographic display system of the present invention further includes an interactive motion capture unit 10 that is electrically connected to the controller 4 , and the interactive motion capture unit 10 is used to identify the user's interactive action and capture the user's interactive action information. It is sent to the controller 4, and the controller 4 adjusts the content of the displayed screen according to the user interactive action information obtained by the received interactive action capture unit 10, so as to realize the interactive action between the user and the screen. Specifically, the camera can be combined with machine vision technology to identify the user's Gesture actions are used to obtain user interaction information, thereby controlling the deformation and/or movement of the support structure 3, thereby adjusting the spatial position and posture of each component of the system. The controller 4 can also capture the user interaction action information obtained by the unit 10 according to the received interaction action It can adjust the content of the displayed screen in real time and realize the interaction between the user and the screen, such as controlling the screen to pan according to the pan gesture signal, or controlling the zooming in, zooming in, pushing away, touching and other operations of the screen according to other corresponding interactive actions.

In addition, for the application scenario in which the spatial position of the user relative to the display system changes in real time, an eye tracking unit 11 that is electrically connected to the controller 4 needs to be set up. The eye tracking unit 11 is used to track the position of the human eye and locate the human eye. The information is sent to the controller 4, and the controller 4 controls the support structure 3 to make corresponding action responses according to the received eye positioning information obtained by the eye tracking unit 11 to adjust the projector 1, the auxiliary imaging screen 7 and the reflection The relative position and/or the overall spatial position of the three geometric holographic screen 8, so that the user's eyes are always in the visual space of the system, so that the user's eyes can always receive projection information even when moving, and watch the picture normally. .

As shown in FIG. 12 and FIG. 13 , in order to further improve the flexibility of the system, a second optical path folding mirror group 9 can also be provided on one side or both sides of the auxiliary imaging screen 7 , and the second optical path folding mirror group 9 is also connected to the support structure 3 . , which contains at least one mirror, so that the imaging optical path can be adjusted so that it can adapt to various application space scenarios. For the display system including the second optical path folding mirror group 9, the relative motion among the projector 1, the auxiliary imaging screen 7, the reflective geometric holographic screen 8 and the second optical path folding mirror group 9 can be controlled simultaneously through the support structure 3 or The overall movement is adjusted in real time to ensure that users can watch it normally.

The display system of the present invention includes several viewpoints, the area of a single viewpoint is SL m ² , the effective projection area of the auxiliary imaging screen 7 is SP m ² , and the distance between the center of the outermost lens of the single projector 1 and the center of the auxiliary imaging screen 7 is SL m 2 . The optical path distance is L meters, and the effective viewing solid angle of each viewpoint satisfies:

For the explanation of the related concept of viewpoint, please refer to the reflective geometric holographic display system with publication number CN111338177A.

The preferred range of the above-mentioned effective projection area SP m ² of the auxiliary imaging screen 7 is 0.005-1.5 m ² , specifically the maximum horizontal projection area of the auxiliary imaging screen 7, which can also be directly placed on a plane and calculated according to the area of the covered plane . In actual design, the regular shape can be directly calculated by geometric relationship. For example, the rectangular screen can be directly calculated by the length and width, etc. For special-shaped screens and curved screens, it is difficult to directly calculate the area. It can be placed on a plane according to the coverage area is calculated.

As shown in FIG. 15 , when the projector 1 provides a viewpoint, the single viewpoint area SL is equal to the area of the light-transmitting portion of the outermost lens of the projector 1 .

The optical path distance between the center of the outermost lens of the single projector 1 and the center of the auxiliary imaging screen 7 is L meters, preferably in the range of 0.1 to 10 meters, and the distance between the center of the outermost lens of the single projector 1 and the auxiliary imaging screen 7 in the working state is L meters. The ratio of the maximum value L _MAX to the minimum value L _MIN of the optical path distance L between the centers should satisfy:

L is the light path travel distance from the center of the outermost lens of the projector 1 to the center of the auxiliary imaging screen 7. In the design, the distance between the center of the outermost lens of the projector 1 and the center of the auxiliary imaging screen 7 can be measured by a soft ruler , for the display system containing the second optical path folding mirror group 9, a layer of light absorbing film (such as black paper) can be covered on the surface of the second optical path folding mirror group 9, and a small hole is set on the film, so that only the position of the small hole The light can be reflected, and the light cannot be reflected in other places. By changing the position of the small hole by moving the light absorbing film, the action point of the light emitted from the center of the outermost lens of the projector 1 and finally irradiated on the center of the auxiliary imaging screen 7 on each lens of the second optical path folding mirror group 9 can be found, so that The optical path distance L in the process can be measured. Of course, the optical path distance can also be directly calculated according to the geometric relationship. Based on the above test method, for the display system containing the second optical path folding mirror group 9, L is as shown in Figure 16. The sum of L1 and L2 shown.

It should be noted that since the display system needs to continuously adjust the window position according to the user's eye position when it is working (when projecting a 3D image to the user), L is not a fixed value, but a range, so it is necessary to ensure this range during design. Any value of L in the interior satisfies the above formula; it should be noted that L is the geometrical relationship size during the working process, that is, the characteristics of the state in which the system normally provides the user with the displayed content. When it is in the non-working state or the storage state, L The value does not need to satisfy the constraints of the formula.

Of course, L can be set to a fixed value for wearable/fixed applications.

For the display system of the present invention, the ideal configuration angle between the connection line (main ray) between the center of the projection lens and the center of the auxiliary imaging screen 7 and the auxiliary imaging screen 7 is 45°. The user's movement follows the movement, so it cannot always maintain the ideal configuration angle, and the included angle will be smaller under certain working conditions, so the immersion in these situations needs to be considered in the design. When the angle between the main light beam and the auxiliary imaging screen 7 is 35°, if a certain sense of immersion can be guaranteed, the overall user experience of the system will be very good. This conclusion has also been confirmed by experiments and user experience feedback. Under this configuration, the effective light field control area of the auxiliary imaging screen 7 can be approximated by SP·sin (35°). Considering that the window itself has a certain size, the area SL occupied by the window itself needs to be deducted for correction, and then divided by the window (also A very accurate approximation of the display effective viewing solid angle of the actual display system can be calculated from the distance between the center of the outermost lens of the projector 1 and the center of the auxiliary imaging screen 7 .

Described below in conjunction with embodiments, see above-mentioned Table 1 for details. The above embodiments provide some ideal configuration modes. Although all dimensions in the above embodiments are in meters (m), it is not limited to use only these dimensions. In practical applications, geometric similarity is considered, and all dimensions are scaled as a whole, or any other dimensions are combined to form an The embodiment is similar to the solid angle, and the display effect thereof will also be consistent without obvious change. In fact, the actual test has also been conducted on the overall scaling range of 0.001 times to 1000 times and other different size combinations in some embodiments. As long as the effective viewing solid angles are similar, the user experience does not feel the difference between different sizes. The difference further shows that the implementation size is not the key factor affecting the effect, but the effective viewing solid angle is.

(1) For desktop application scenarios:

In the office scene, the requirements for the effective viewing stereo angle of the viewpoint are relatively low, preferably 0.2 to 0.6. At this time, it can show a good stereo effect, and at the same time, it has a certain sense of immersion, which can meet the office needs under most conditions.

In the game entertainment scene, the effective viewing solid angle of any viewpoint is preferably 0.6 to 0.8. At this time, a good three-dimensional effect can be exhibited, and the immersion is further improved.

(2) For wearable application scenarios:

For the glasses-type auxiliary display scene, the effective viewing solid angle of the effective display at any viewpoint is further preferably 1.2-2.2, which provides a sufficient sense of immersion.

For any effective viewing solid angle of head-mounted/wearable audio-visual application scenarios, 2.2 to 3.4 is further preferred. At this time, the display solid angle is larger and the sense of immersion is stronger.

For any effective viewing solid angle of head-mounted/wearable game application scenarios, 2.5 to 3.8 is further preferred, and the sense of immersion can be further enhanced at this time.

(3) For remote operation application scenarios:

For remote control of the robot for surgical scenes, the solid angle for any effective viewing is further preferably 3 to 4. At this time, the performance of the on-site optical environment is more realistic.

For remote control of robots for field search and rescue operations, the solid angle for any effective viewing is further preferably 4 to 5.2, which can simulate the real environment to a great extent and create an immersive feeling.

In the case where one projector 1 only provides one viewpoint, the SL is preferably between 0.000004m ² and 0.0025m ² (4 square millimeters to 25 square centimeters). This range can ensure that the projector can provide a complete window under the condition of making the projector. Be as small as possible.

In the case where one projector 1 provides two viewpoints, the light-transmitting area of the outermost lens is preferably between 49 square centimeters and 100 square centimeters, which can ensure that the projector is not particularly bulky.

Also, for desktop application scenarios:

For mobile terminal application scenarios:

The SP is preferably between 0.02 square meters and 0.16 square meters, and the L is preferably between 0.1 and 0.6 meters. In this case, the portability balance can be better taken into account. Further, the auxiliary imaging screen 7 can be made into a foldable or scroll type.

For wearable application scenarios:

The SP is preferably 4 square centimeters to 50 square centimeters, and the L is preferably between 5 and 12 mm, which can better meet the wearing needs. Further, it can be set that two glasses share the same auxiliary imaging screen 7 or separately set an auxiliary imaging screen 7 for each glasses. For the case where each glasses are provided with an auxiliary imaging screen 7 alone, the SP is preferably set to 4cm ² . It is suitable to be between ˜12.8 cm ² , and it is more suitable to set the SP between ²⁸ cm 2 and 50 cm ² for two glasses sharing the same auxiliary imaging screen 7 .

Another very special feature of the display system of the present invention is that the screen contains two functions at the same time, that is, the auxiliary imaging screen 7 and the reflective geometric holographic screen 8, and the two need to cooperate with each other to realize the display function. Usually, the reflective geometric holographic screen 8 needs to contain very fine microstructures, and the manufacturing cost is much higher than that of the auxiliary imaging screen 7. Therefore, in order to save costs, it is necessary to reduce the area of the reflective geometric holographic screen 8 as much as possible. The effective display solid angle of the reflective geometric holographic screen 8 should not be too small, so it needs to be balanced and designed to achieve the optimal effect. When the area SG of the reflective geometric holographic screen 8 and the area SP of the auxiliary imaging screen 7 satisfy

, an optimal trade-off between cost and display effect can be achieved.

In addition, polarizing film, 1/4 glass slide, anti-reflection film, light absorption film and other optical elements can be added to further improve the utilization rate of light and display effect.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims

A geometric holographic display system with an optimized display configuration, wherein the geometric holographic display system with an optimized display configuration includes at least one projector (1) for projecting picture information in space, a geometric holographic screen (2), the position of which is the same as that of all Corresponding to the projector (1), a support structure (3) providing physical structural support for the projector (1) and the geometric holographic screen (2), and a control unit electrically connected to the projector (1) device (4), the geometric holographic display system of the optimized display configuration further includes:

A preset number of viewpoints, the area of a single viewpoint is SL m 2 , the effective projection area of the geometric holographic screen (2) is SP m 2 , and the center of the outermost lens of the single projector (1) and the geometric holographic screen ( 2) The optical path distance between the centers is L meters, and the effective viewing solid angle of each viewpoint satisfies:
The geometric holographic display system with optimized display configuration according to claim 1, wherein, when the geometric holographic screen (2) comprises a transmissive geometric holographic screen (5), the position of the transmissive geometric holographic screen (5) is different from the position of the transmissive geometric holographic screen (5). The projector (1) corresponds to, and is used for optically transforming the picture on one side to the other side to form an optical conjugate image; the effective projection area of the transmissive geometric holographic screen (5) is SPm 2 , and the single The optical path distance between the center of the outermost lens of the projector (1) and the center of the transmissive geometric holographic screen (5) is L meters.
The geometric holographic display system with optimized display configuration according to claim 2, wherein the optical path between the center of the outermost lens of the single projector (1) and the center of the transmissive geometric holographic screen (5) The ratio of the maximum value LMAX to the minimum value LMIN of the distance L satisfies:
The geometric holographic display system with optimized display configuration according to claim 2, wherein the effective projection area SP m 2 of the transmissive geometric holographic screen (5) ranges from 0.005 to 1.5 m 2 .
The geometric holographic display system with optimized display configuration according to claim 2, wherein the optical path between the center of the outermost lens of the single projector (1) and the center of the transmissive geometric holographic screen (5) The range of L meters is 0.1 to 10 meters.
The geometric holographic display system with optimized display configuration according to claim 2, wherein the geometric holographic display system with optimized display configuration further comprises at least one geometric holographic display system disposed on one side or two of the transmissive geometric holographic screen (5). A first optical path folding mirror group (6) on the side, the first optical path folding mirror group (6) includes at least one plane mirror with a reflective function, which is used to change the propagation path of the light projected by the projector (1).
The geometric holographic display system with optimized display configuration according to claim 2, wherein the first optical path folding mirror group (6) is connected with the support structure (3).
The geometric holographic display system with optimized display configuration according to claim 1, wherein when the geometric holographic screen (2) comprises an auxiliary imaging screen (7) and a reflective geometric holographic screen (8), the auxiliary imaging screen ( 7) For light splitting, the reflective geometric holographic screen (8) is located on one side of the auxiliary imaging screen (6) or on both sides of the auxiliary imaging screen (7); The effective projection area is SP m 2 , and the optical path distance between the center of the outermost lens of the single projector (1) and the center of the auxiliary imaging screen (7) is L meters.
The geometric holographic display system with optimized display configuration according to claim 8, wherein the optical path distance L between the center of the outermost lens of the single projector (1) and the center of the auxiliary imaging screen (7) The ratio of the maximum value LMAX to the minimum value LMIN satisfies:
The geometric holographic display system with optimized display configuration according to claim 8, wherein the effective projection area SP m 2 of the auxiliary imaging screen (7) ranges from 0.005 to 1.5 m 2 .
The geometric holographic display system with optimized display configuration according to claim 8, wherein the optical path distance L between the center of the outermost lens of the single projector (1) and the center of the auxiliary imaging screen (7) The meter range is 0.1 to 10 meters.
The geometric holographic display system with optimized display configuration according to claim 8, wherein the geometric holographic display system with optimized display configuration further comprises at least one, A second optical path folding mirror group (9) for adjusting the optical path.
The geometric holographic display system with optimized display configuration according to claim 8, wherein the second optical path folding mirror group (9) is connected with the support structure (3).
The geometric holographic display system with optimized display configuration according to any one of claims 1 to 13, wherein the range of the single viewpoint area SL m 2 is 0.000004-0.5 m 2 .
The geometric holographic display system with optimized display configuration according to any one of claims 1-13, wherein the support structure (3) is a deformable and/or movable structure, and is connected with the controller (4) electrical connection.
The geometric holographic display system with optimized display configuration according to any one of claims 1-13, wherein the geometric holographic display system with optimized display configuration further comprises an interactive motion capture unit electrically connected to the controller (4). (10), the interactive action capturing unit (10) is configured to identify the interactive action of the user and send the user interactive action information to the controller (4), the controller (4) according to the received interaction The user interaction action information acquired by the motion capture unit (10) adjusts the content of the display screen.
The geometric holographic display system with an optimized display configuration according to any one of claims 1-13, wherein the geometric holographic display system with an optimized display configuration further comprises an eye tracking unit electrically connected to the controller (4). (11), the human eye tracking unit (11) is configured to track the position of the human eye and send the positioning information of the human eye to the controller (4), and the controller (4) can The human eye positioning information obtained by the human eye tracking unit (11) is used to control the support structure (3) to make a corresponding action response to adjust the spatial position of each part of the display system, so that the user's eyes are always in the available position of the system. within the viewing space.