WO2019071905A1

WO2019071905A1 - Aerial suspension display system

Info

Publication number: WO2019071905A1
Application number: PCT/CN2018/077596
Authority: WO
Inventors: 于迅博; 高鑫; 张婉璐; 陈铎; 邢树军; 王鹏
Original assignee: 北京眸合科技有限公司
Priority date: 2017-10-13
Filing date: 2018-02-28
Publication date: 2019-04-18
Also published as: CN107622741A

Abstract

An aerial suspension display system, comprising a display source (M1), an optical module, and an arc surface reflective mirror (R), the optical module comprising lens groups (M2, M'2) and a beam splitting lens (E0), the lens groups comprising at least one lens, the arc surface reflective mirror (R) being a convex reflective mirror, a concave reflective mirror, or a reflective Fresnel mirror equivalent to the arc surface reflective mirror; the emission of the display source (M1) passes through an incident light end of the optical enters the optical modules (M2, M'2) via an incident end of the optical enters the optical modules (M2, M'2), passes through the optical modules (M2, M'2) and the beam splitting lens (E0), and then enters the arc surface reflective mirror (R) via an emergent light end of the optical modules (M2, M'2); light is reflected by the arc surface reflective mirror (R), enters the optical modules (M2, M'2) via the emergent light end of the optical modules (M2, M'2) and, after passing through the beam splitting lens (E0), converges in the air to form a suspended image (M3). The present aerial suspension display system can implement a large viewing angle, large size, high definition, and undistorted aerially suspended image.

Description

Aerial suspension display system

cross reference

The present application is hereby incorporated by reference in its entirety in its entirety in its entirety in its entirety in the the the the the the the the the

Technical field

Embodiments of the present invention relate to the field of optical display technologies, and in particular, to an air suspension display system.

Background technique

From black and white displays to color displays, from CRT displays to quantum dot displays, from flat-panel displays to naked-eye 3D displays; new display technologies have been researched for a long time, and these display technologies have been successfully applied in various fields, such as life entertainment. Exhibitions, advertising media, medical education, military command, etc. Among the many display technologies, the airborne floating display technology has attracted the attention of many researchers because it can present images in the air, bringing viewers a strong visual impact and a true and false sensory experience.

The suspended image categories are mainly divided into three-dimensional air imaging of real objects and air imaging of planar virtual objects. The former mainly places the real object in the floating display system, and by illuminating the real object, the observer can see the real object suspended in the air through the display system. The latter mainly realizes the floating content suspended in the air after passing the virtual image displayed by the flat panel display such as LCD through the display system. The essence of a floating display system is an optical system that can be a real image. This display method has broad application prospects. For example, in an exhibition, an object can be suspended in the air to provide a sci-fi and realistic visual experience for the viewer; for example, in medical education, the doctor can operate without touching the physical screen. In order to observe the information on the display, this will reduce the spread of bacteria to a certain extent; for example, in military operations, officers usually need to wear gloves for combat command or operation equipment, in which case it is necessary to touch the traditional display screen. To remove the gloves, the floating display device can be used to click on the screen in the air to complete the combat command or equipment operation.

Conventional floating display devices are implemented using a single concave mirror plus a 45 degree tilted beam splitter. This optical structure is the earliest proposed solution for such display systems. The optical path is: the illuminated real object or the content displayed by the LCD is reflected by the spectroscope into the concave mirror, and the light is again reflected by the converging mirror of the concave mirror and then imaged in the air on the other side. At this point, the observer can see the image of the air suspension. The advantage of this solution is that the structure is simple, and the cost of the concave mirror can be greatly reduced after the application of the resin material. Disadvantages are: the size of the suspended image is small, the viewing angle is small, and the image is severely deformed.

Summary of the invention

Embodiments of the present invention provide an air suspension display system that overcomes the above problems or at least partially solves the above problems.

An embodiment of the present invention provides an air suspension display system, an air suspension display system, the system includes a display source, an optical module, and a curved mirror, the optical module includes a lens group and a beam splitter, The lens group includes at least one lens, and the curved mirror is a concave mirror, a convex mirror or a reflective Fresnel mirror equivalent to the curved mirror; wherein

The light emitted by the display source enters the optical module through the light incident end of the optical module, passes through the lens group and the beam splitter, and then enters the light exit end of the optical module. a curved mirror; the light reflected by the curved mirror re-enters the optical module through the light exit end of the optical module, and passes through the beam splitter to converge in the air to form a suspended image.

Further, each lens in the optical module is a conventional lens or a Fresnel lens.

Further, the distance between the centers of adjacent lenses in the optical module is d, and 500 mm ≥ d ≥ 0 mm; the thickness of each lens in the optical module is 1, and 500 mm ≥ l > 0 mm; The diameter of the circumscribed circle of each lens in the module is D, and 5000mm≥D>0mm.

Optionally, the light emitted by the display source enters the optical module through the light incident end of the optical module, is reflected by the beam splitter, and then enters the light exit end of the optical module. a curved mirror; the reflection of the light through the curved mirror re-enters the optical module through the light exit end of the optical module, and is transmitted through the splitter to form a suspended image in the air.

Optionally, the light emitted by the display source enters the optical module through the light incident end of the optical module, is transmitted through the beam splitter, and then enters the light exit end of the optical module. a curved mirror; the reflection of the light through the curved mirror re-enters the optical module through the light exit end of the optical module, and is reflected by the beam splitter to converge in the air to form a suspended image.

Optionally, the system further comprises a reflective element;

The reflective element is disposed between the display source and a light incident end of the optical module, between the beam splitter and the imaging position of the system, or any one of the optical elements and the curved surface of the learning module Between the mirrors, any one of the optical elements is any one of the lens groups or the beam splitter.

Wherein, the rotation angle of the beam splitter is θ ₀ , 90°>θ ₀ >0°; the rotation angle of the reflective element is θ ₁ , and 90°>θ ₁ >0°.

Optionally, the reflective element is disposed between the display source and a light incident end of the optical module;

The light emitting surface of the display source is perpendicular to the light incident end of the optical module, and the light emitted by the display source is emitted by the reflective component and enters the optical module;

The distance between the light emitting surface of the display source and the center of the reflective element is 0-5000 mm, and the distance between the lens center of the light incident end of the optical module and the center of the reflective element is 0-5000 mm.

Optionally, the reflective element is disposed between the beam splitter and the imaging position of the system; wherein

The reflected light of the curved mirror passes through the beam splitter, and is reflected by the reflective element to converge in the air to form a suspended image;

The distance between the imaging position of the system and the central position of the reflective element is 0-5000 mm, and the distance between the central position of the beam splitter and the center position of the reflective element is 0-5000 mm.

Optionally, the reflective element is disposed between any one of the optical modules and the curved mirror; wherein

The reflected light of the curved mirror is reflected by the reflective element into the optical module, and is concentrated in the air through the beam splitter to form a suspended image;

The distance between the curved mirror and the reflective element is 0-5000 mm, and the distance between the center of the arbitrary optical element and the center of the reflective element is 0-5000 mm.

Embodiments of the present invention provide an air suspension display system, which modulates and splits light emitted by a display source through an optical module including a lens group and a beam splitter, and then enters a curved mirror, and the curved mirror reflects the light. The beam splitter splits in the air to form a suspended image, and the aerial floating display system can realize a large angle of view, large size, high definition and undistorted aerial floating image.

DRAWINGS

1 is a structural diagram of an air suspension display system according to an embodiment of the present invention;

2 is a shape of a conventional lens in an embodiment of the present invention;

Figure 3 is a view showing the shape of a Fresnel lens in an embodiment of the present invention;

4 is a structural diagram of another air suspension display system according to an embodiment of the present invention;

FIG. 5 is a structural diagram of still another air suspension display system according to an embodiment of the present invention; FIG.

6 is a structural diagram of still another air suspension display system according to an embodiment of the present invention;

FIG. 7 is a structural diagram of still another air suspension display system according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly described in conjunction with the drawings in the embodiments of the present invention. Some embodiments, rather than all of the embodiments, are invented. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiments of the present invention relate to the following technical terms:

A conventional lens refers to a spherical or aspherical lens, and the material may be various glass or plastic;

A Fresnel lens is a planar lens having an equivalent function to a conventional lens, and its ridges may be concentric circles or linear threads;

Aberration means that the results obtained by non-paraxial ray tracing in the actual optical system are inconsistent with the results obtained by the paraxial ray tracing. These deviations from the ideal condition of Gaussian optics (first approximation theory or paraxial ray) , called aberration. One kind of aberration is distortion, which refers to the distortion of the image;

A beam splitter is a plane mirror that divides a beam of light into transmitted light and reflected light, usually made of optical glass.

In order to solve the prior art problem and achieve a better suspension display effect, an embodiment of the present invention provides an air suspension display system based on a concave mirror or a convex mirror combined with an optical lens module.

FIG. 1 is a schematic structural diagram of an air suspension display system according to an embodiment of the present invention. As shown in FIG. 1 , the system includes a display source, an optical module, and a curved mirror. The optical module includes a lens group and A beam splitter, the lens group comprising at least one lens, the curved mirror being a concave mirror, a convex mirror or a reflective Fresnel mirror equivalent to the curved mirror. among them,

The light emitted by the display source enters the optical module through the light incident end of the optical module, passes through the lens group and the beam splitter, and then enters the light exit end of the optical module. Curved mirror. The light reflected through the curved mirror re-enters the optical module through the light exit end of the optical module, and passes through the beam splitter to converge in the air to form a suspended image.

Wherein, the display source M ₁ is an electronic device or an actual object illuminated, which can provide visual content information to the viewer. It can be a liquid crystal display (LCD), a laser display, a projector, an LED display, an OLED display, a quantum dot display, or other device and system capable of displaying visual content. It is used to display static, dynamic, and anything that can be displayed or seen. Static content means that the displayed content does not change over time, including but not limited to pictures, still images, static text, and chart data. Dynamic content refers to content that changes over time, including but not limited to recorded video, live video, changed images, dynamic text and chart data, and the like.

The optical module includes M ₂ , M′ ₂ and beam splitter E ₀ , as follows:

M ₂ , M' ₂ , M _{2 are} composed of the lens 1 to the lens K shown in Fig. 1, and K represents the number of lenses in the composite lens group M ₂ . M' _{2 is} composed of the lens 1 to the lens N shown in Fig. 1, and N represents the number of lenses in the composite lens group M' ₂ , wherein K and N satisfy the relationship: when N = 0, K ≥ 1 when N > 0 , K≥0; Various optical films (for example, antireflection film) can be plated on the optical lens according to actual needs. The function of the composite lens group is to combine the concave mirror R to modulate (refractive and reflect) the light emitted by the display source, so that the emitted light can be concentrated in the air according to a certain rule to achieve the purpose of floating imaging in the air.

The beam splitter E ₀ has a partially transmissive and partially reflected planar optical element having a transmittance ranging from 1% to 99% and a reflectance ranging from 1% to 99%. The material can be glass or acrylic and other plastic materials. The thickness can be determined according to actual needs.

The curved mirror R can be of ordinary spherical surface or other aspherical surface type, and its material can be various glass, metal, acrylic and other plastic materials. The reflective surface can be on the front surface or on the back surface. The reflectivity can be selected from: 1% to 99%. (It is necessary to declare that the control of the reflectivity can add some components or coatings on the above materials or film on the surface. Other ways to achieve). Its shape may be any shape such as a rectangle, a circle, a square, a hexagon, etc., so D ₀ refers to the size of the diameter of the circumcircle of the concave mirror, and the range of variation is 5000 mm ≥ D ₀ > 0 mm. Its thickness can be determined according to actual needs. In addition, the curved mirror R may also be a reflective Fresnel mirror equivalent thereto.

In the air system of the imaged M _3, suspended in the air of the representative still images or motion video, the observer can actually see an image or video floating in the air, and may be suspended through the hand image.

Based on the above embodiments, each of the lenses in the optical module is a conventional lens or a Fresnel lens.

In particular, the optical lens in the optical module in the floating display system can be a conventional glass lens, a plastic lens or a Fresnel lens or any combination therebetween.

As shown in FIG. 2, each optical lens in the optical module in the floating display system of the above embodiment may be any one of the structures of FIG. 2 or a composite structure that is glued together. For example, the plano-convex lens and the biconcave lens in FIG. 2 may constitute a double-glued lens or a lenticular lens to form a three-glued structure or the like. R is the radius of curvature of the optical lens, and its absolute value ranges from: R>0. l is the center thickness of the optical lens, and its value range is: 500 mm ≥ l > 0 mm. l _E is the edge thickness of the optical lens, and its value range is: 500mm ≥ l _E > 0mm The shape of the optical lens can be any shape such as rectangle, circle, square, hexagon, etc., so D refers to the circumcircle of each optical lens. The size of the diameter, the selection range is: 5000mm ≥ D > 0mm. The material used for each optical lens may be various glass materials (such as enamel glass, flint glass, heavy glass, heavy flint glass or LA glass); it may be a plastic resin material (such as PMMA, PC, COC, POLYCARB, etc.; various optical films (such as anti-reflection film) can be plated on optical lenses according to actual needs. It should be noted that Figure 2 only describes the existence of several forms of conventional lenses, and does not limit the scope and authority of patents. Figure 2 shows that the optical lens is in the form of a conventional lens, and the optical lens can also be in the form of a Fresnel lens.

As shown in FIG. 3, each of the optical lenses in the optical module may be any of the structures of FIG. 3 or a composite structure that is glued together. The power of each optical lens can be taken as positive power, negative power or zero power depending on the situation. The thickness of the Fresnel lens ranges from 500 mm ≥ d > 0 mm. The shape of the Fresnel lens may be any shape such as a rectangle, a circle, a square, a hexagon, etc., so D refers to the size of the diameter of the circumscribed circle of each Fresnel lens, and the selection range is: 5000 mm ≥ D > 0 mm. The pitch of the Fresnel lens ranges from 0.01 mm to 100 mm. Various optical films (for example, antireflection film) can be plated on the Fresnel lens according to actual needs. It should be noted that Figure 3 only illustrates several Fresnel lenses and does not limit the structural form of the Fresnel lens. In fact, the tooth depth, inclination angle, and draft angle of each tooth of the Fresnel lens can be adjusted according to the actual production process and requirements while ensuring the power does not change. Each tooth of the Fresnel lens can be either a linear triangular sawtooth or an arc equivalent to its corresponding lens. These are all within the scope of this patent.

Figure 2-3 illustrates that the optical lens in the optical module is a conventional lens and a Fresnel lens. It should be noted that these are only two specific embodiments, and do not limit the scope and authority of the patent. In fact, the optical module can be a combination of the two (ie a combination of a conventional lens and a Fresnel lens).

Based on the above embodiment, the distance between the centers of adjacent lenses in the optical module is d, and 500 mm ≥ d ≥ 0 mm; the thickness of each lens in the optical module is l, and 500 mm ≥ l > 0 mm; The diameter of the circumscribed circle of each lens in the optical module is D, and 5000 mm ≥ D > 0 mm.

Based on the above embodiment, as shown in FIG. 1 , the light emitted by the display source enters the optical module through the light incident end of the optical module, is reflected by the beam splitter, and then passes through the optical module. The light exit end enters the arc mirror; the light is reflected by the arc mirror and enters the optical module again through the light exit end of the optical module, and is transmitted through the beam splitter in the air. Converging to form a suspended image.

Specifically, the light emitted by the display source M ₁ enters the composite lens group M ₂ , and through the modulation (reflection and refraction) of the optical module, the light is incident on the planar optical element E ₀ having partial transmission and partial reflection. The light is reflected by E ₀ and enters the composite lens group M' ₂ . After the modulation (reflection and refraction) of the optical module, the light is incident on the concave mirror R. The light reflected by the concave mirror R will again pass through the composite lens group M' ₂ and pass through E _{0 and} then condense and image in the air on the right side thereof. L _O in Fig. 1 is the distance between the center of the display element M _{1 and} the center of the first lens in the composite lens group M ₂ , and the range is: 5000 mm ≥ L _O ≥ ₀ mm, and d is the optical module M ₂ , M' ₂ The pitch of the center of the adjacent optical lens has a variation range of 500 mm ≥ d ≥ 0 mm, and l is the thickness of each optical lens, and the variation range is 500 mm ≥ l > 0 mm.

L ₁ is the distance from the center of the Kth lens in the composite lens group M ₂ in Fig. 1 to the center of E ₀ , and the range of variation is: 5000 mm ≥ L ₁ ≥ ₀ mm. L ₂ is the distance between the center of the mirror E _{0 and} the center of the Nth optical lens in the composite lens group M' ₂ of Fig. 1, and the range of variation is: 5000 mm ≥ L ₂ ≥ 0 mm. θ ₀ is the rotation angle of E ₀ , and the range of variation is: 90° > θ ₀ > 0°. L ₃ is the distance from the center of the first optical lens of the composite lens group M' ₂ to the center of the concave mirror R, and the range of variation is: 5000 mm ≥ L ₃ ≥ 0 mm. L _I is the distance between the center of E _{0 and} the center of the suspended image in the air. The range of variation is 5000 mm ≥ L ₃ ≥ 0 mm, and θ is the viewing angle. The range of variation is: 180 ° ≥ θ > 0 ° (need to be declared: The viewing angle of the viewing angle may be 360 degrees), and the ratio of the size of the floating image to the size of the displayed image on the display source M ₁ varies from 0.1:1 to 10:1.

Based on the above embodiment, as shown in FIG. 4, the light emitted by the display source enters the optical module through the light incident end of the optical module, and is transmitted through the beam splitter, and then passes through the optical module. The light exit end enters the curved mirror; the light is reflected by the curved mirror and enters the optical module again through the light exit end of the optical module, and is reflected in the air after being reflected by the beam splitter Converging to form a suspended image.

Based on the above embodiments, the system further includes a reflective element;

The reflective element is disposed between the display source and a light incident end of the optical module, between the beam splitter and the imaging position of the system, or any one of the optical components and the curved surface of the optical module Between the mirrors, any one of the optical elements is any one of the lens groups or the beam splitter.

Specifically, by adding a reflective element, the optical path of the system can be more varied, the structural adjustment is more flexible, and it is more suitable for marketing.

Based on the above embodiment, as shown in FIG. 5, the reflective element is disposed between the display source and the light incident end of the optical module;

Wherein, the reflective element is a plane mirror with reflective capability, such as a glass mirror, a resin mirror, a smooth metal surface, and the like having a reflective element. Its size range is: 10mm ~ 5000mm. The range of reflectance varies from 1% to 99%.

Specifically, L _O is the distance from the center of the display source M _{1 to} the center of E ₁ , and the range of variation is: 5000 mm ≥ L _O ≥ ₀ mm. L ₁ is the distance from the center of E _{1 to} the center of the first optical lens in the composite lens group M ₂ , and the range of variation is: 5000 mm ≥ L ₁ ≥ ₀ mm. θ ₁ is the rotation angle of E ₁ , and the range of variation is: 90° > θ ₁ > 0°. L ₂ is the distance from the center of the Kth optical lens in the composite lens group M ₂ to the center of E ₀ , and the range of variation is: 5000 mm ≥ L ₂ ≥ 0 mm. θ ₀ is the rotation angle of E ₀ , and the range of variation is: 90° > θ ₀ > 0°. L ₃ is the distance from the center of E _{0 to} the center of the Nth optical lens in the composite lens group M' ₂ , and the range of variation is: 5000 mm ≥ L ₃ ≥ 0 mm. L ₄ is the distance from the center of the first optical lens of the composite lens group M' ₂ to the concave mirror, and the range of variation is: 5000 mm ≥ L ₄ ≥ 0 mm. d is the pitch of the center of the adjacent optical lens in the composite lens group M ₂ , M′ ₂ , and the variation range is 500 mm ≥ d ≥ 0 mm, and l is the thickness of each optical lens, and the variation range is 500 mm ≥ l > 0 mm. L _I is the distance from the center of E _{0 to} the center of the suspended image M ₃ in the air, and its range of variation is 5000 mm ≥ L _I ≥ 0 mm, θ is the viewing angle, and the range of variation is: 180 ° ≥ θ > 0 ° (there is a look around The angle of view can be 360 degrees). The ratio of the size of the floating image to the size of the displayed image on the display source M ₁ varies from 0.1:1 to 10:1.

It is to be noted that, in FIG. 5, an element E ₁ having a reflection function is added between the display source M ₁ and the composite lens group M ₂ , and the reflection element E ₁ may be one or more. Figure 2 is only one example, and does not limit the scope and authority of this patent. In order to eliminate the influence of ambient light and glare, a polarizer (linear polarizer or circular polarizer) or a quarter can be added to the above optical path. One of the wavelength retarders and the like.

Based on the above embodiment, as shown in FIG. 6, the reflective element is disposed between the beam splitter and an imaging position of the system;

Specifically, the light emitted by the display source M ₁ enters the composite lens group M ₂ , and through the modulation (reflection and refraction) of the optical module, the light is incident on the planar optical element E ₀ having partial transmission and partial reflection. The light is reflected by E ₀ and enters the composite lens group M' ₂ . After the modulation (reflection and refraction) of the optical module, the light is incident on the concave mirror R. The light reflected by the concave mirror R will again pass through the composite lens group M' ₂ and pass through E _{0 and} then be incident on the reflective element E ₁ , and the reflected light will converge in the air above E ₁ . L _O is the distance between the center of the display element M _{1 and} the center of the first lens in the composite lens group M ₂ , and the range is: 5000 mm ≥ L _O ≥ ₀ mm, and d is the adjacent optical in the optical module M ₂ , M′ ₂ The pitch of the center of the lens is varied from 500 mm ≥ d ≥ 0 mm, and l is the thickness of each optical lens, and the range of variation is 500 mm ≥ l > 0 mm. L ₁ is the distance from the center of the Kth lens in the composite lens group M ₂ in Fig. 1 to the center of E ₀ , and the range of variation is: 5000 mm ≥ L ₁ ≥ ₀ mm. L ₂ is the distance between the center of the mirror E _{0 and} the center of the Nth optical lens in the composite lens group M' ₂ of Fig. 1, and the range of variation is: 5000 mm ≥ L ₂ ≥ 0 mm. θ ₀ is the rotation angle of E ₀ , and the range of variation is: 90° > θ ₀ > 0°. L ₃ is the distance from the center of the first optical lens of the composite lens group M' ₂ to the center of the concave mirror R, and the range of variation is: 5000 mm ≥ L ₃ ≥ 0 mm. L ₄ is the distance from the center of E _{0 to} the center of the reflective element E ₁ , and the range of variation is: 5000 mm ≥ L ₄ ≥ 0 mm. L _I is the distance between the center of E _{1 and} the center of the suspended image in the air. The range of variation is 5000 mm ≥ L _I ≥ 0 mm, and θ is the viewing angle. The range of variation is: 180 ° ≥ θ > 0 ° (need to be declared: The viewing angle of the viewing angle may be 360 degrees), and the ratio of the size of the floating image to the size of the displayed image on the display source M ₁ varies from 0.1:1 to 10:1.

Figure 6 shows only one of the structural forms of the display system, and does not limit the protection range of the display system. In fact, one or more reflective components can be added between E ₀ and the suspended image M ₃ . The effect of floating display can be achieved. In order to eliminate the influence of ambient light and glare, a polarizer (linear polarizer or circular polarizer), a quarter-wave retarder, or the like may be added to the above optical path.

Based on the above embodiment, as shown in FIG. 7, the reflective element is disposed between any one of the optical modules and the curved mirror;

Specifically, the light emitted by the display source M ₁ enters the composite lens group M ₂ , and through the modulation (reflection and refraction) of the optical module, the light is incident on the planar optical element E ₀ having partial transmission and partial reflection. The light is reflected by E ₀ and enters the composite lens group M' ₂ . After being modulated (reflected and refracted) by the optical module and reflected by the reflective element E ₁ , it is incident on the concave mirror R. Light reflected by the concave mirror R is again reflected back reflector element E ₁ second _'0 E ₂ and after passing through the converging air as its right by the composite lens group M. L _O is the distance from the center of the display source M _{1 to} the center of the first optical lens in the composite lens group M ₂ , and the range of variation is: 5000 mm ≥ L _O ≥ ₀ mm. L ₁ is the distance from the center of E ₀ in the Kth optical lens in the composite lens group M ₂ , and the range of variation is: 5000 mm ≥ L ₁ ≥ ₀ mm. θ ₀ is the rotation angle of E ₀ , and the range of variation is: 90° > θ ₀ > 0°. L ₂ is the distance from the center of E _{0 to} the center of the Nth optical lens in the composite lens group M' ₂ , and the range of variation is: 5000 mm ≥ L ₂ ≥ 0 mm. L ₃ is the distance from the center of the first optical lens in the composite lens group M' ₂ to the center of the reflective element E ₁ , and the range of variation is: 5000 mm ≥ L ₃ ≥ 0 mm. θ ₁ is the rotation angle of E ₁ , and the range of variation is: 90° > θ ₁ > 0°. L ₄ is the distance from the center of E _{1 to} the center of the concave mirror R, and the range of variation is: 5000 mm ≥ L ₄ ≥ 0 mm. d is the pitch of the center of the adjacent optical lens in the composite lens group M ₂ , M′ ₂ , and the variation range is 500 mm ≥ d ≥ 0 mm, and l is the thickness of each optical lens, and the variation range is 500 mm ≥ l > 0 mm. L _I is the distance from the center of E _{0 to} the center of the suspended image M ₃ in the air, and its range of variation is 5000 mm ≥ L _I ≥ 0 mm, θ is the viewing angle, and the range of variation is: 180 ° ≥ θ > 0 ° (there is a look around The angle of view can be 360 degrees). The ratio of the size of the floating image to the size of the displayed image on the display source M ₁ varies from 0.1:1 to 10:1.

It should be stated that in Figure 7, the component E1 with reflection function is added between E ₀ and the concave mirror R. Figure 7 is only one example, and does not limit the scope and authority of this patent. By adding one or more elements with reflection function between E ₀ and the concave mirror R, the effect of floating display can also be achieved. In order to eliminate the influence of ambient light and glare, a polarizer (linear polarizer or circular polarizer), a quarter-wave retarder, or the like may be added to the above optical path.

Based on the above embodiments, the face shape of each lens in the optical module is obtained by using optical design software or an algorithm according to actual conditions.

Specifically, taking the concave mirror and the conventional lens group and the structure shown in FIG. 1 as an example, when optimizing the design of the concave mirror and the surface shape of each lens, it is first necessary to determine the center of the display source M ₁ and the composite lens group M. ₂ from the center of the first lens L _O; M ₂ from the composite lens group in the center of the K-th lens element E ₀ Center L _1; element E ₀ to the center of the composite lens group M _'2 N-th lens center The distance L ₂ ; the distance L ₃ between the center of the first lens and the center of the concave reflection R in the composite lens group M' ₂ and the distance L _I from the center of the element E ₀ to the suspended image M ₃ . Secondly, the size and viewing angle of the suspended image are determined, and finally the number of lenses in the composite lens group is determined.

All of the above are the target values to be optimized by the whole system. To achieve these target values, it is necessary to use the optimization algorithm to iteratively calculate after selecting the optimization variables, and finally obtain the values of the optimization variables and the specific surface parameters that satisfy the target value. The optimization variables of the system are: the thickness of each optical lens, the spacing of adjacent optical lenses, the material selected for the optical lens, and the surface formula followed by each optical lens (including various variables in the formula: curvature, aspheric coefficient, etc.) (It can be an existing spherical or aspherical formula, or a user-defined face formula). Table 1 is the parameters of the concave mirror calculated according to the above method, and Table 2 is the composite lens group M ₂ , M' ₂ calculated according to the above method. The parameters of one of the optical lenses are as shown in Table 1, and are calculated according to the above method. The parameters of one of the obtained optical lenses.

Table 1

Table 2

The surface formulas followed by the optical components in Tables 1 and 2 are as follows:

Where Z is the vector height of the lens, c is the curvature, r is the radial aperture, k is the conic coefficient, and a1 to a5 are aspherical coefficients.

The above embodiment is only one possibility. In fact, the system optimization target value change, the optimization variable selection change, the optimization order change, the face shape formula selection (internal variable selection) and the optimization algorithm selection can Different variable values and face parameters are obtained, so there will be countless results for the face parameters that meet the requirements. In addition, these face types may also be Fresnel lenses equivalent thereto. These are all people of the industry who can obtain different surface parameters by modification after referring to the above embodiments without any creative labor, and these should all fall within the protection scope of this patent.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the foregoing embodiments are modified, or the equivalents of the technical features are replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

An airborne floating display system, characterized in that the system comprises a display source, an optical module and a curved mirror, the optical module comprises a lens group and a beam splitter, the lens group comprises at least one lens, The curved mirror is a concave mirror, a convex mirror or a reflective Fresnel mirror equivalent to the curved mirror. among them,

The light emitted by the display source enters the optical module through the light incident end of the optical module, passes through the lens group and the beam splitter, and then enters the light exit end of the optical module. a curved mirror; the light reflected by the curved mirror re-enters the optical module through the light exit end of the optical module, and passes through the beam splitter to converge in the air to form a suspended image.
The system of claim 1 wherein each of said optical modules is a conventional lens or a Fresnel lens.
The system according to claim 2, wherein a distance between adjacent ones of said optical modules is d, and 500 mm ≥ d ≥ 0 mm; each lens of said optical module has a thickness of 1, and 500mm≥l>0mm; the diameter of the circumscribed circle of each lens in the optical module is D, and 5000mm≥D>0mm.
The system according to claim 3, wherein the light emitted by the display source enters the optical module through the light incident end of the optical module, is reflected by the beam splitter, and then passes through the optical mode. The light exit end of the group enters the arc mirror; the light is reflected by the arc mirror and enters the optical module again through the light exit end of the optical module, and is transmitted through the beam splitter The air gathers to form a suspended image.
The system according to claim 3, wherein the light emitted by the display source enters the optical module through the light incident end of the optical module, is transmitted through the beam splitter, and then passes through the optical mode. The light exit end of the group enters the arc mirror; the light is reflected by the arc mirror and enters the optical module again through the light exit end of the optical module, and is reflected by the beam splitter The air gathers to form a suspended image.
A system according to claim 4 or 5, wherein said system further comprises a reflective element;

The reflective element is disposed between the display source and a light incident end of the optical module, between the beam splitter and the imaging position of the system, or any one of the optical components and the curved surface of the optical module Between the mirrors, any one of the optical elements is any one of the lens groups or the beam splitter.
The system according to claim 6, wherein said spectroscope has a rotation angle of θ 0 , 90° > θ 0 >0°; said reflection element has a rotation angle of θ 1 and 90° &gt ; θ 1 > 0°.
The system according to claim 7, wherein said reflective element is disposed between said display source and said light incident end of said optical module;

The light emitting surface of the display source is perpendicular to the light incident end of the optical module, and the light emitted by the display source is emitted by the reflective component and enters the optical module;

The distance between the light emitting surface of the display source and the center of the reflective element is 0-5000 mm, and the distance between the lens center of the light incident end of the optical module and the center of the reflective element is 0-5000 mm.
The system of claim 7 wherein said reflective element is disposed between said beam splitter and said imaging position of said system;

The reflected light of the curved mirror passes through the beam splitter, and is reflected by the reflective element to converge in the air to form a suspended image;

The distance between the imaging position of the system and the central position of the reflective element is 0-5000 mm, and the distance between the central position of the beam splitter and the center position of the reflective element is 0-5000 mm.
The system of claim 7 wherein said reflective element is disposed between any one of said optical modules and said curved mirror;

The reflected light of the curved mirror is reflected by the reflective element into the optical module, and is concentrated in the air through the beam splitter to form a suspended image;

The distance between the curved mirror and the reflective element is 0-5000 mm, and the distance between the center of the arbitrary optical element and the center of the reflective element is 0-5000 mm.