CN112782851B - Zoom display system and zoom display method - Google Patents
Zoom display system and zoom display method Download PDFInfo
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- CN112782851B CN112782851B CN201911094399.3A CN201911094399A CN112782851B CN 112782851 B CN112782851 B CN 112782851B CN 201911094399 A CN201911094399 A CN 201911094399A CN 112782851 B CN112782851 B CN 112782851B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
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Abstract
The application provides a zoom display system and a zoom display method. The zoom display system includes: the image generation module is used for generating image light carrying information; an adjustable steering mirror for deflecting the image light to form deflected light; and the multiplexing volume holographic film is used for receiving the deflected light and forming diffracted light corresponding to the specific focal length based on the incident angle of the deflected light on the multiplexing volume holographic film.
Description
Technical Field
The present application relates to the field of optical systems, and more particularly, to a zoom display system and a zoom display method.
Background
In many situations, it is desirable to view objects through a light-transmitting screen while also receiving information conveyed by light imaging.
In a meeting application scenario, a large projection screen displays images of a variety of different exhibits. The exhibitors want to see these images related to the exhibit and want the images to be displayed in a distance, hierarchical fashion.
In an application scenario of an AR gaming device. When a user plays a game using an AR game device, the user's line of sight may fall on objects of different distances as the game scenario advances. The AR game device provides a game AR screen at a corresponding position when the user desires to observe an object at a certain distance.
In addition, the consistency of the running safety of vehicles is an important point of attention. While driving a vehicle, the driver mainly looks outside the vehicle to observe the driving environment outside the vehicle, but the driver still needs to pay attention to some information displayed in the vehicle, such as the driving speed displayed on the dashboard, the fuel amount in the fuel tank, and the like. When the vision of the driver moves between the far and near, the potential safety hazard of running exists.
The Head Up Display (HUD) system includes a transparent screen so that a driver can observe a projected image displayed on the screen when observing an environment outside the vehicle through the screen. However, the environment outside the vehicle is relatively wide, and when the observation position of the eyes of the driver is different from the position of the projected image displayed on the screen, the driver cannot observe the clear projected image while observing the environment.
Disclosure of Invention
Embodiments of the present application provide a zoom display system including: the image generation module is used for generating image light carrying information; an adjustable steering mirror for deflecting the image light to form deflected light; and the multiplexing volume holographic film is used for receiving the deflected light and forming diffracted light corresponding to the specific focal length based on the incident angle of the deflected light on the multiplexing volume holographic film.
In one embodiment, the adjustable steering mirror has at least two preset states, and the propagation direction of the deflected light is switched by switching the preset states of the adjustable steering mirror.
In one embodiment, the zoom display system further comprises: and the control module is used for controlling the adjustable steering mirror to switch the preset state.
In one embodiment, the zoom display system further comprises: the viewpoint tracking module is in communication connection with the control module and is used for obtaining viewpoint signals and sending control signals to the control module; the control module controls the adjustable steering mirror to switch the preset state based on the control signal.
In one embodiment, the multiplexed volume hologram receives at least two deflected light rays in the propagation directions, the deflected light rays of the multiplexed volume hologram corresponding to each propagation direction having a focal length; the multiplexed volume hologram film has at least two focal lengths different from each other.
In one embodiment, the multiplexed volume holographic film is reflective or transmissive.
In one embodiment, the multiplexed volume hologram film is of an amplitude type or a phase type.
In one embodiment, the multiplexed volume hologram film includes at least one of a red light layer, a blue light layer, and a green light layer.
In one embodiment, an image generation module includes a light source and a display device.
In one embodiment, the light source comprises a laser light source or a light emitting diode light source.
In one embodiment, the display device comprises a liquid crystal display, a liquid crystal on silicon display, or a digital light processor.
In one embodiment, the adjustable steering mirror comprises an adjustable plane mirror, an adjustable free-form mirror, or a microelectromechanical system scanning mirror.
In one embodiment, the image generated by the image generation module is located between the image generation module and the multiplexed volume holographic film.
In a second aspect, embodiments of the present application provide a zoom display method, which is characterized by including: generating image light carrying information; deflecting the image light by an adjustable steering mirror to form deflected light; and receiving the deflected light rays through the multiplexed volume hologram film and forming diffracted light rays.
In one embodiment, the multiplexed volume hologram receives at least two directions of deflected light rays and has one focal length corresponding to each direction of deflected light rays, the at least two focal lengths being different from each other.
In one embodiment, the direction of propagation of the deflected light is switched by switching the preset state of the adjustable steering mirror.
In one embodiment, the method further comprises: and acquiring a viewpoint signal and controlling the adjustable steering mirror to switch the preset state based on the viewpoint signal.
In one embodiment, obtaining the viewpoint signal and controlling the adjustable steering mirror to switch the preset state based on the viewpoint signal includes: the viewpoint signal is obtained through the viewpoint tracking module and a control signal is sent to the control module; the control module controls the adjustable steering mirror to switch the preset state based on the control signal.
In one embodiment, the wavelength of the deflected light is the same as the wavelength of the reference light for manufacturing the multiplexed volume hologram film, and the polarization angle of the deflected light is the same as the polarization angle of the reference light.
The zoom display system provided by the embodiment of the application is simple in structure and can form images at different projection positions.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIG. 1 schematically illustrates an operational schematic of a zoom display system according to an embodiment of the present application;
FIG. 2 schematically illustrates a flow chart of a method of manufacturing a zoom display system according to the present application;
FIG. 3 schematically illustrates a schematic diagram of the method of obtaining focal length of FIG. 2;
fig. 4 schematically shows a schematic diagram of a method of manufacturing a multiplexed volume hologram film;
FIG. 5 schematically illustrates a flow chart of a zoom display method according to the present application;
FIG. 6 schematically illustrates a flow chart of a method of forming deflected light rays of FIG. 5; and
fig. 7 schematically shows a block diagram of a computer system implementing the zoom display method of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Thus, the first focal length discussed below may also be referred to as the second focal length without departing from the teachings of the present application. And vice versa.
In the drawings, the thickness, size, and shape of the components have been slightly adjusted for convenience of description. The figures are merely examples and are not drawn to scale. For example, the working area and focal length of the multiplexed volume hologram film are not in proportion to actual production. As used herein, the terms "about," "approximately," and the like are used as terms of a table approximation, not as terms of a table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by one of ordinary skill in the art.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including engineering and technical terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. In addition, unless explicitly defined or contradicted by context, the particular steps included in the methods described herein are not necessarily limited to the order described, but may be performed in any order or in parallel. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, a zoom display system provided in an embodiment of the present application may include: an image generation module 100, an adjustable steering mirror 200 and a multiplexed volume hologram 500.
The image generation module 100 may generate an image light L1 carrying information and emit the image light L1 toward the adjustable steering mirror 200. In particular, the image generation module 100 may include a light source and a display device. The light source is configured to emit light of sufficient brightness and impinge upon the display device, which is configured to form image information, such as image information including graphics or colors.
The adjustable steering mirror 200 may include an adjustable plane mirror, an adjustable free-form mirror, or a Micro-Electro-Mechanical System (MEMS) scanning mirror for deflecting the image light L1 to form the deflected light L2, and the adjustable steering mirror 200 may deflect the image light L1 in different directions. Illustratively, the adjustable steering mirror 200 includes an adjustable plane mirror. An acute angle is formed between the reflecting surface of the adjustable plane mirror and the image light L1. The value of the acute angle is varied by rotating the adjustable plane mirror, for example, a first preset state and a second preset state, respectively. The deflected light L2 corresponding to the first preset state and the deflected light L2 corresponding to the second preset state have different propagation directions in space.
The multiplexed volume hologram film 500 may receive the deflected light L2 of different directions and form a corresponding diffracted light based on the deflected light L2. When the deflected light rays L2 of different propagation directions are incident on the multiplexed volume hologram film 500, it generally means having different incident angles. The multiplexed volume hologram film 500 may have different diffraction characteristics for different incident angles, the formed optical paths have different focal points, and the respective focal points of the multiplexed volume hologram film 500 have mutually different focal lengths.
The image generated by the image generation module 100 is located between the image generation module 100 and the multiplexed volume hologram 500, and the diffracted light forms a virtual image located opposite thereto. The distance between the virtual image formed by the diffracted light propagating along the different optical paths and the multiplexed volume hologram film 500 is different.
The zoom display system provided by the application can be used for an automobile, and the multiplexing volume hologram 500 can be firstly installed during installation, for example, the multiplexing volume hologram 500 and a windshield are manufactured into a whole and fixed in the automobile. The adjustable steering mirror 200 is then adjusted so that the driver can see the virtual image formed by the diffracted light on the side outside the vehicle while looking outside the vehicle through the multiplexed volume hologram 500.
When the driver observes the environment closer to the vehicle body, for example, when driving in a region with a narrow environment, the adjustable steering mirror 200 can be adjusted to a first preset state to adjust the angle at which the deflected light L2 is incident on the multiplexed volume hologram film 500, so that the virtual image formed by the diffracted light formed by the multiplexed volume hologram film 500 is closer to the vehicle body. The driver can observe the information provided by the external environment and the zoom display system at the same time, so that the observation distance of the driver can be kept in a relatively stable section. When the driver observes an environment far from the vehicle body, for example, when driving a car to travel faster, the adjustable steering mirror 200 can be adjusted to a second preset state to adjust the angle of the deflected light L2 incident on the multiplexed volume hologram film 500 to another value, so that a virtual image formed by the diffracted light formed by the multiplexed volume hologram film 500 is far from the vehicle body. When the driver observes a far external environment, the driver can observe the external environment and information provided by the zoom display system at the same time by keeping the observation distance in a relatively constant interval.
The zoom display system provided by the embodiment of the application is simple in structure, can provide virtual images with different space positions, and is suitable for matching different observation positions of a user.
The multiplexed volume hologram film 500 may be disposed at different substrates, thereby enabling the zoom display system of the present application to be used for different scenes.
In an exemplary embodiment, the multiplexed volume hologram film 500 may have more focal lengths corresponding to more deflected light rays L2. For example, in addition to having three focal lengths corresponding to three different deflected light rays L2 and the three focal lengths being different from each other as shown in fig. 1, the multiplexed volume hologram film 500 may have five focal lengths corresponding to five different deflected light rays L2, at least three of which are different from each other.
In an exemplary embodiment, the propagation direction of the deflected light ray L2 formed by the adjustable steering mirror 200 is switched by switching a preset state thereof. Illustratively, the adjustable steering mirror 200 may have a reflective surface 201, and the body of the adjustable steering mirror 200 is fixed relative to the image generation module 100, and switching the preset state of the adjustable steering mirror 200 may cause the attitude of the reflective surface 201 in space to change and be fixed in the preset state. The relative position between the reflecting surface 201 and the image light L1 emitted by the image generating module 100 changes, so that the propagation direction of the deflected light L2 formed at the reflecting surface 201 based on the image light L1 in space changes.
In an exemplary embodiment, the adjustable steering mirror 200 includes a preset plurality of mirror surfaces. The adjustable steering mirror 200 can be adjusted to have different mirrors in the propagation path of the image light L1 to deflect the image light L1. Specifically, the adjustable steering mirror 200 may be adjusted by translation, quick release, rotation, etc., and different mirrors may form the deflected light rays L2 having different propagation directions. The variable steering mirror 200 of different structures may have a preset state in the respective structures and may maintain the preset state.
In an exemplary embodiment, the adjustable steering mirror 200 is adjustable by a movement mechanism that can be manually adjusted.
In an exemplary embodiment, the zoom display system further comprises: a control module 400 for controlling the adjustable steering mirror 200 to switch the preset state. The control module 400 switches the adjustable steering mirror 200 to each preset state based on the control signal. The control signal may be, for example, a button that the user presses to switch the adjustable steering mirror 200 to a desired preset state based on the need.
In an exemplary embodiment, the zoom display system further comprises: the viewpoint tracking module 300 is communicatively coupled to the control module 400. The viewpoint tracking module 300 may be used to obtain a viewpoint signal. Illustratively, the viewpoint tracking module 300 may emit infrared rays toward eyes of a user and receive the reflected infrared rays, and the viewpoint tracking module 300 may obtain a viewpoint signal from the reflected infrared rays. Specifically, the eyes of the user may have different observation positions, so that the infrared rays reflected by the eyes carry different viewpoint signals, and the viewpoint tracking module 300 may determine the observation position of the user based on the viewpoint signals, and determine whether to send a control signal to the control module 400 or what kind of control signal to send to the control module 400. The viewpoint tracking module 300 may send a corresponding control signal to the control module 400 based on the viewpoint signal, and the control module 400 controls the adjustable steering mirror 200 to switch to a corresponding preset state based on the control signal.
Illustratively, the normal to the multiplexed volume hologram film 500 is placed in a substantially horizontal direction. The user views through the multiplexed volume hologram film 500, and the user's viewing position is at a distance from the multiplexed volume hologram film 500. When the zoom display system is in operation, the image generation module 100 emits image light L1 with image information; the viewpoint tracking system 300 detects a viewpoint signal and judges an observation position of a user based on the viewpoint signal, and then issues a first control signal; the control module 400 controls the adjustable steering mirror 200 to a first preset state based on the first control signal. The variable steering mirror 200 deflects the image light L1 to form a deflected light L2, and the multiplexed volume hologram lens 500 forms a diffracted light L3 based on the deflected light L2, and the user receives the diffracted light L3 to observe a virtual image I1. The virtual image I1 is located at a relatively long distance from the multiplexed volume hologram 500, and a user can observe both the actual scene and the virtual image I1 without having to adjust the line of sight in a large scale.
When the user's viewing position is adjusted to be closer to the multiplexed volume hologram film 500, the viewpoint tracking system 300 detects a viewpoint signal and judges the user's viewing position based on the viewpoint signal, and then issues a third control signal; the control module 400 controls the adjustable steering mirror 200 to a third preset state based on the third control signal. The image light L1 is deflected by the adjustable steering mirror 200 to form a deflected light L2, the deflected light L2 generated by the adjustable steering mirror 200 in the third preset state has a different propagation direction from the deflected light L2 formed in the first preset state, and the two deflected light L2 have different incident angles with respect to the multiplexed volume hologram film 500. The multiplexed volume hologram lens 500 forms a diffracted light L3 based on the deflected light L2, and a user receives the diffracted light L3 to observe a virtual image I3. The virtual image I3 is located at a relatively short distance from the multiplexed volume hologram 500 and is located within the user's line of sight, and the user can observe both the actual scene and the virtual image I3 without having to adjust the line of sight in a large scale. The user's line of sight can simultaneously observe the actual scenery and the virtual image (i.e., the image information transmitted from the image generation module 100) both at a far distance and at a near distance, and can easily and simultaneously and clearly view the images when the viewing position is switched.
In an exemplary embodiment, the viewpoint tracking module 300 may track the left and right eyes of the user, respectively.
In an exemplary embodiment, the light source comprises a laser light source or a light emitting diode (Light Emitting Diode, LED) light source. The laser light source or the LED light source may be selected based on the diffraction characteristics of the multiplexed volume hologram film 500. Illustratively, the light emitted by the light source satisfies the Bragg condition with respect to the multiplexed volume holographic film 500.
In an exemplary embodiment, the display device includes a liquid crystal display (Liquid Crystal Display, LCD), a liquid crystal on silicon display (Liquid Crystal on Silicon, LCOS), a digital light processor (Digital Light Processing, DLP), or the like, and is used to add image information, such as information of a vehicle state, a road environment condition, or the like, to light emitted from the light source.
In the exemplary embodiment, among the respective focal lengths of the multiplexed volume hologram film 500, the focal length corresponding to the smaller incident angle of the deflected light ray L2 has a larger value. The sequentially arranged focal lengths facilitate continuous adjustment of the position of the virtual image in use.
In an exemplary embodiment, the multiplexed volume hologram film 500 is a reflective multiplexed volume hologram film 500. When the adjustable steering mirror 200 is on the observation side of the multiplexed volume hologram film 500, the reflected multiplexed volume hologram film 500 forms diffracted light L3 based on the reflected light obtained by the deflected light L2, and the observer can observe a virtual image on the same side of the multiplexed volume hologram film 500 as the adjustable steering mirror 200.
In an exemplary embodiment, the multiplexed volume hologram film 500 is a transmissive multiplexed volume hologram film 500. When the variable steering mirror 200 is on the observed side of the multiplexed volume hologram film 500, the transmitted multiplexed volume hologram film 500 forms diffracted light L3 based on the transmitted light obtained by deflecting the light L2, and the observer and the variable steering mirror 200 are on both sides of the multiplexed volume hologram film 500, and the observer can observe a virtual image on the observed side. The reflection type multiplexing volume hologram film 500 or the transmission type multiplexing volume hologram film 500 has different optical paths and can be adapted to different installation spaces.
In an exemplary embodiment, the multiplexed volume hologram film 500 may include an amplitude type or a phase type. The phase-type multiplexed volume hologram 500 may have a high image brightness, so that a user can still see an image in a bright use environment. In theory, as the number of multiplexing times increases, the diffraction efficiency of the phase-type multiplexed volume hologram film 500 decreases, and for example, when multiplexing is performed five times, the theoretical maximum efficiency is 20%. The efficiency of conventional display systems is typically less than 18% and the efficiency of the zoom display system provided by the present application is still relatively high. Illustratively, the brightness of the image generation module 100 may be increased. A brighter and sharper image may be obtained by increasing the brightness of the image generation module 100.
In an exemplary embodiment, the multiplexed volume hologram film 500 may include at least one of a red light layer, a blue light layer, and a green light layer. An image of at least one color may be generated or a gorgeous color image may be generated.
The zoom display system provided by the application realizes multiple changes of projection distance by combining the multiplexing volume holographic film 500 and the adjustable steering mirror 200, and has simple structure and low cost. The multiplexed volume holographic film 500 is thinner than the common lens, has small volume and can be flexibly controlled. In addition, the projected image has higher brightness and is suitable for viewing.
Referring to fig. 2 to 4, based on the zoom display system of the present application, the present application also provides a method of manufacturing a multiplexed volume hologram, comprising the steps of: obtaining a plurality of preset incidence angles; respectively irradiating the raw material films with reference light along a preset incident angle, and irradiating the same position of the raw material films with object light to cause the object light to interfere with the reference light; the raw material film records each interference pattern, and forms a focus corresponding to each incident angle of the reference light one by one. Wherein the object light and the reference light are generated by the same light source.
In an exemplary embodiment, when the incident angle of the reference light is changed, the position of the raw material film or the lens between the light sources to the raw material film is changed accordingly. Multiplexing a plurality of volume holographic film layers into a whole. At least two of the focal lengths of the volume holographic film layers are different in value.
In an exemplary embodiment, the multiplexed volume hologram film 500 may be prepared on a substrate. The substrate may be an automobile windshield, or a polyester (Polyethylene terephthalate, PET) film, or the like.
Referring to fig. 2 and 3, in an exemplary embodiment, the present application provides a method 1000 of manufacturing a zoom display system, which may include: s1010, obtaining a preset projection distance L. The projection distance L is a distance from the virtual image I to the multiplexed volume hologram film 500 in the direction of the user's line of sight. Generally, the projection distance L may have a maximum value and a minimum value according to the scene of use.
S1020, the object distance L 'of the real image O may be set according to the installation environment, and several virtual images I and the distance of each virtual image I from the multiplexed volume hologram 500 may be set, and the focal length of the focal point corresponding to each virtual image I may be obtained based on the object distance L' and the projection distance L of each virtual image I. Furthermore, the angle of incidence required for each focal point is obtained.
S1030, the multiplexed volume hologram film 500 may be prepared with reference to the aforementioned method of preparing a multiplexed volume hologram film.
S1040 may be further included, in which the image generation module 100, the adjustable steering mirror 200, and the multiplexed volume hologram 500 are built into a zoom display system. The image light L1 generated by the image generating module 100 is deflected by the adjustable steering mirror 200 to form a deflected light L2, where the deflected light L2 forms a real image O. The positions of the image generation module 100, the adjustable steering mirror 200, and the multiplexed volume hologram 500 are adjusted by adjusting the object distance L' of the real image O with respect to the multiplexed volume hologram 500.
In the exemplary embodiment, when the multiplexed volume hologram film 500 is prepared, the wavelength of the reference light is the same as the wavelength of the deflected light ray L2 generated by the tunable steering mirror 200 to be used.
Referring to fig. 3 and 4, illustratively, when the multiplexed volume hologram film 500 is prepared, the projection distance L is set to have a farthest distance and a nearest distance, that is, the projection of the zoom display system has a largest image distance and a smallest image distance, and corresponds to the farthest distance value a and corresponds to the nearest distance value b. And sets the object distance L' based on the environment to be installed.
The relationship may be based on:
and calculating focal lengths corresponding to the farthest distance and the nearest distance respectively. For example, when the projection distance L is a, the first focal point F1 should have a focal length F1, and when the projection distance L is b, the third focal point F3 should have a focal length F3. Referring to fig. 4, the surface of the raw material film is XoZ, and the normal line of the surface is the Y axis. It is understood that the focal length F1 of the first focal point F1 refers to the distance from the plane parallel to the plane XoZ to the plane XoZ where the first focal point F1 is located.
Referring to the foregoing relation, when it is desired that the zoom display system has three focuses, the multiplexed volume hologram 500 may be made to have a second focus F2 between the first focus F1 and the third focus F3, the focal length F2 of the second focus F2 satisfying F1 < F2 < F3. Illustratively, when it is desired that the zoom display system can zoom 4 times, the multiplexed volume hologram 500 may also be made to have a fourth focal point, and the focal length f4 of the fourth focal point may satisfy f1 < f2 < f4 < f3.
When the multiplexed volume hologram film 500 is manufactured, reference rays for each incident angle are made to form one focus correspondingly.
Illustratively, the first reference light L201 having a large incident angle interferes with the first object light L101 having a large opening angle at the raw material film, forming an interference pattern having a first focus F1; the second reference light L202 having another incident angle interferes with the object light L102 having another opening angle at the raw material film, forming an interference pattern having a second focus F2; the third reference light L203 having a smaller incident angle interferes with the third object light L103 having a larger aperture angle at the raw material film, forming an interference pattern having a third focal point F3.
A multiplexed volume hologram 500 having three focuses can be manufactured, and referring to fig. 1, when the multiplexed volume hologram 500 is used, different diffracted light rays are formed after being irradiated by deflected light rays L2 having different incident angles, and a virtual image I1, a virtual image I2, and a virtual image I3 can be formed, respectively.
For example, the focal lengths corresponding to different incident angles may be set as required, and when the incident angles are sequentially changed, the corresponding focal lengths may not be sequentially changed in size, for example, the focal lengths corresponding to the incident angles of a moderate angle are the largest.
Referring to fig. 1, 5 and 6, the embodiment of the present application further provides a zoom display method 2000, which includes the following steps:
s2010, an image light L1 carrying information is generated. In particular by the image generation module 100.
S2020, the image light L1 is deflected by the adjustable steering mirror 200 to form a deflected light L2. The directions of the correspondingly generated deflected light rays L2 may be made different from each other by switching the preset state of the adjustable steering mirror 200. The switching mode can be manual or automatic.
S2030, and receiving the deflected light L2 through the multiplexed volume hologram film 500 and forming diffracted light L3. The multiplexed volume hologram film 500 receives at least two directions of deflected light L2 and has one focus corresponding to each direction of deflected light L2, and focal lengths of the at least two focuses are different from each other.
In an exemplary embodiment, further comprising: 3000, obtaining a viewpoint signal and controlling the adjustable steering mirror 200 to switch a preset state based on the viewpoint signal. The mode can conveniently realize the automatic control of the zooming display system.
Specifically, acquiring the viewpoint signal and controlling the adjustable steering mirror to switch the preset state 3000 based on the viewpoint signal may include:
s3010, the viewpoint signal is obtained by the viewpoint tracking module 300, and the observation distance of the user is obtained from the viewpoint signal.
S3020, judging the size of the observation distance. For example, referring to fig. 1, a multiplexed volume hologram film 500 having three focuses is used, and the multiplexed volume hologram film 500 may form a first virtual image I1 corresponding to a first focus F1, a second virtual image I2 corresponding to a second focus F2, and a third virtual image I3 corresponding to a third focus F3, respectively, when in use. The projection distances of the three virtual images are a1, a2 and a3 in sequence. Each projection distance in fig. 1 refers to the distance from the plane of the virtual image to the user. The distance c of the user's viewing position with respect to the user itself may satisfy one of the following conditional expressions:
when c > (a1+a2)/2:
may include S3030A, the viewpoint tracking module 300 sends a first control signal to the control module 400, and in response to the first control signal, the control module 400 controls the adjustable steering mirror 200 to be in a first preset state, so that the deflected light L2 formed by the adjustable steering mirror 200 triggers the first focal point F1 of the multiplexed volume hologram 500.
When (a2+a3)/2 is less than or equal to c is less than or equal to (a1+a2)/2:
may include S3030B, the viewpoint tracking module 300 sends a second control signal to the control module 400, and in response to the second control signal, the control module 400 controls the adjustable steering mirror 200 to be in a second preset state, so that the deflected light L2 formed by the adjustable steering mirror 200 triggers the second focal point F2 of the multiplexed volume hologram 500.
When c < (a2+a3)/2:
may include S3030A, the viewpoint tracking module 300 transmits a third control signal to the control module 400, and in response to the third control signal, the control module 400 controls the adjustable steering mirror 200 to be in a third preset state, so that the deflected light L2 formed by the adjustable steering mirror 200 triggers the third focal point F3 of the multiplexed volume hologram 500. Illustratively, the viewing position c of the user in fig. 1 satisfies c < (a2+a3)/2.
Referring to fig. 7, the zoom display system of the present application further includes a processing unit 600, the processing unit 600 including one or more processors, communication sections, etc., such as: one or more Central Processing Units (CPUs) 601, and/or one or more image processors (GPUs) 613, etc., the processors may perform various suitable actions and processes according to executable instructions stored in a read-only memory (ROM) 602 or executable instructions loaded from a storage portion 608 into a Random Access Memory (RAM) 603. The communication portion 612 may include, but is not limited to, a network card, which may include, but is not limited to, a IB (Infiniband) network card.
The processor may be in communication with the rom 602 and/or the ram 503 to execute executable instructions, and is connected to the communication unit 612 through the bus 604, and is in communication with other target devices through the communication unit 612, so as to perform operations corresponding to any of the methods provided in the embodiments of the present application, for example: the viewpoint signal is obtained through the viewpoint tracking module and a control signal is sent to the control module; the control module controls the adjustable steering mirror to switch the preset state based on the control signal; generating image light carrying information; deflecting the image light by an adjustable steering mirror to form deflected light; switching the propagation direction of the deflected light by switching the preset state of the adjustable steering mirror; and receiving the deflected light rays through the multiplexed volume hologram film and forming diffracted light rays.
In addition, in the RAM 603, various programs and data necessary for device operation can also be stored. The CPU 601, ROM 602, and RAM 603 are connected to each other through a bus 604. In the case of RAM 603, ROM 602 is an optional module. The RAM 603 stores executable instructions that cause the processor 601 to execute operations corresponding to the communication methods described above, or write executable instructions to the ROM 602 at the time of execution. An input/output (I/O) interface 605 is also connected to bus 604. The communication unit 612 may be integrally provided or may be provided with a plurality of sub-modules (e.g., a plurality of IB network cards) and be connected to a bus link.
The following components are connected to the I/O interface 605: an input portion 606 including keys, a scroll wheel, etc.; an output portion 607 including a display device or the like such as the image generation module 100 and a speaker or the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 605 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is installed as needed on drive 610 so that a computer program read therefrom is installed as needed into storage section 608.
It should be noted that the architecture shown in fig. 7 is only an alternative implementation, and in a specific practical process, the number and types of components in fig. 7 may be selected, deleted, added or replaced according to actual needs; in the setting of different functional components, implementation manners such as separation setting or integration setting can also be adopted, for example, the GPU and the CPU can be separated or the GPU can be integrated on the CPU, the communication part can be separated or the communication part can be integrated on the CPU or the GPU, and the like. Such alternative embodiments fall within the scope of the present disclosure.
In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowchart, the program code may include instructions corresponding to the execution of the method steps provided by the embodiments of the present application, for example: extracting a plurality of visual responses from the image, respectively for a plurality of image features in the image; extracting a plurality of word responses of each word in a plurality of words aiming at a plurality of words contained in the sentence representing the image detection requirement, wherein the plurality of word responses are responses aiming at word semantics in the words and respectively correspond to a plurality of image features in the image; based on the visual responses and the word responses, obtaining a first matching degree of each word in the words and the images respectively; and obtaining a second matching degree of the image and the sentence based on each first matching degree. According to the technical scheme, the matching detection of the image can be completed based on sentences. In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 609, and/or installed from the removable medium 611. The above-described functions defined in the method of the present application are performed when the computer program is executed by a Central Processing Unit (CPU) 601.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the technical concept. Such as the above-mentioned features and the technical features having similar functions (but not limited to) in the application are replaced with each other.
Claims (12)
1. A zoom display system, for use in an automobile, comprising:
the image generation module is used for generating image light carrying information;
the viewpoint tracking module is in communication connection with the control module and is used for obtaining viewpoint signals for determining the observation distance of a user and sending control signals to the control module;
the control module controls the adjustable steering mirror to switch the preset state of the adjustable steering mirror based on the control signal;
the adjustable steering mirror is used for deflecting the image light to form deflected light, and has at least two preset states, and the propagation direction of the deflected light is switched by switching the preset states of the adjustable steering mirror; and
the multiplexing volume holographic film is used for receiving the deflection light rays and forming diffraction light rays corresponding to a specific focal length based on the incidence angles of the deflection light rays on the multiplexing volume holographic film; the multiplexing volume holographic film is prepared on an automobile windshield, receives the deflection light rays in at least two propagation directions, and has a focal length corresponding to the deflection light rays in each propagation direction; at least two focal lengths of the respective focal lengths of the multiplexed volume hologram film are different from each other; the focal length is determined from the object distance and the projection distance.
2. The zoom display system of claim 1, wherein the multiplexed volume holographic film is reflective or transmissive.
3. The zoom display system according to claim 1, wherein the multiplexed volume hologram is of an amplitude type or a phase type.
4. The zoom display system of claim 1, wherein the multiplexed volume holographic film comprises at least one of a red light layer, a blue light layer, and a green light layer.
5. The zoom display system of claim 1, wherein the image generation module comprises a light source and a display device.
6. The zoom display system of claim 5, wherein the light source comprises a laser light source or a light emitting diode light source.
7. The zoom display system of claim 5, wherein the display device comprises a liquid crystal display, a liquid crystal on silicon display, or a digital light processor.
8. The zoom display system of claim 5, wherein the adjustable steering mirror comprises an adjustable plane mirror, an adjustable free-form mirror, or a microelectromechanical system scanning mirror.
9. The zoom display system of claim 1, wherein the image generated by the image generation module is located between the image generation module and the multiplexed volume holographic film.
10. A zoom display method, applied to an automobile, comprising:
generating image light carrying information;
acquiring a viewpoint signal for determining the observation distance of a user and controlling an adjustable steering mirror to switch a preset state of the adjustable steering mirror based on the viewpoint signal;
deflecting the image light by an adjustable steering mirror to form deflected light; and
receiving the deflected light rays through a multiplexing volume holographic film and forming diffracted light rays;
the multiplexing volume holographic film is prepared on an automobile windshield by switching the preset state of the adjustable steering mirror to switch the propagation directions of the deflection light rays, receives the deflection light rays in at least two propagation directions, has a focal length corresponding to each propagation direction, and is different from each other, and the focal length is determined according to the object distance and the projection distance.
11. The zoom display method according to claim 10, wherein the acquiring a viewpoint signal and controlling the adjustable steering mirror to switch the preset state based on the viewpoint signal comprises:
the viewpoint signal is obtained through the viewpoint tracking module and a control signal is sent to the control module;
the control module controls the adjustable steering mirror to switch the preset state based on the control signal.
12. The zoom display method according to claim 11, wherein the wavelength of the deflected light is the same as the wavelength of the reference light for manufacturing the multiplexed volume hologram.
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