1, the length of the first display screen 3 and the length of the second display screen 5 are the same; the width of the reflection structure 1, the width of the first display screen 3 and the width of the second display screen 5 are the same; and the width of the holographic medium 2 is Y times the width of the reflection structure 1.

Preferably, the reflection structure 1 comprises a cuboid frame 11, a mirror 12 and optical glass 13; light-emitting elements 14 are installed in a circle at the peripheral inner side of the cuboid frame 11; the mirror 12 is arranged at the lower part of the cuboid frame 11; and the optical glass 13 is arranged at the upper part of the cuboid frame 11.

Preferably, the optical glass 13 has the optical property of unidirectional light transmission. The light-emitting elements 14 can be LED lamp bands, LED screens or other elements or materials that can emit light. The light can pass through the light transmission side of the optical glass 13. The light cannot pass through the reflecting surface of the optical glass 13, but is reflected. The light emitted by the light-emitting elements 14 is reflected by each other through the reflecting side of the optical glass 13 and the mirror 12 to form a visual effect of infinite inward extension. In this way, a very deep spatial visual effect is achieved through a very shallow physical depth.

Preferably, the holographic medium 2 is a thin film with a special chemical coating, or a glass coated with a special chemical coating. It has strong reflectivity for image reflection, and also has high transparency.

The working principle and beneficial effects of the above technical solution are as follows:

- 1. As shown in FIG. 2, in use, the light emitted by the image displayed in the second display screen 5 can pass through the optical glass 13 to reach the mirror 12, and a virtual image D′ is formed through the reflection of the mirror 12 inside the reflection structure 1. The virtual image D′ is located in the infinitely extended space formed by the reflection structure 1, and the depth of the virtual image D′ in the space is equal to the height (as shown in FIG. 2, the height is the up-down direction) of the mirror 12 in the reflection structure 1 from the second display screen 5. The light reflected from the virtual image space, formed by the reflection structure 1 and the second display screen 5, with four infinitely extended sides and a background image in the middle is incident onto the holographic medium 2, and the virtual image D″ of the infinite space and the background image reflected from the holographic medium 2 is imaged behind the first display screen 3. The foreground image displayed by the first display screen 3 forms an obvious depth feeling with the infinite space effect of the reflection structure 1 and the background image effect of the second display screen 5 formed behind the first display screen 3. The first display screen 3 does not display the part of the image, because it is black and does not emit light. Thus, this part will be ignored by the viewer, and only the rear virtual image will be seen, thereby presenting the naked-eye 3D image display effect in the entire device.
- 2. The background image is not just an infinitely extended black visual effect, but can present a rich background image. The space depth is less than half that of the same type of technology, but the same visual effect can still be displayed.
- 3. By adding a new display surface and an optical reflection path in the structure of the prior art, the present invention realizes the display of the background image and achieves a rich display effect.

Embodiment 2: based on embodiment 1, as shown in FIGS. 4-6, the mirror 12 is parallel to the corresponding side edge of the cuboid frame 11; and the optical imaging structure further comprises:

- an inner rectangular frame 6, wherein the peripheral outer side of the inner rectangular frame 6 is fixed at the lower part of the peripheral inner side of the cuboid frame 11;
- four groups of auxiliary mechanisms 7, wherein the four groups of auxiliary mechanisms 7 are arranged at the lower part of the peripheral sides of the cuboid frame 11 respectively, and the auxiliary mechanisms 7 further comprise:
- two groups of first auxiliary connecting rods 71 perpendicular to the corresponding side edge of the cuboid frame 11, wherein the first auxiliary connecting rods 71 slidably penetrate through the corresponding side edge of the cuboid frame 11;
- first connecting plates 72, wherein the first connecting plates 72 are parallel to the corresponding side edge of the cuboid frame 11, and the first connecting plates 72 are fixedly connected with one end of the first auxiliary connecting rods 71 located at the inner side of the cuboid frame 11;
- second connecting plates 73, wherein the second connecting plates 73 are fixedly connected with one end of the first auxiliary connecting rods 71 located at the outer side of the cuboid frame 11, the outer sides of the first auxiliary connecting rods 71 are sleeved with a first spring 74, and both ends of the first spring 74 are respectively fixedly connected with the second connecting plates 73 and the outer side of corresponding side edge of the cuboid frame 11;
- second auxiliary connecting rods 75, wherein one end of the second auxiliary connecting rods 75 is fixedly connected to one side of the second connecting plates 73 away from the first connecting plates 72;
- limiting balls 76, wherein the limiting balls 76 are connected to the other ends of the second auxiliary connecting rods 75;
- first connecting blocks 77, wherein the first connecting blocks 77 are fixedly connected to the outer side of the corresponding side edge of the cuboid frame 11;
- telescopic rods 78, wherein the telescopic rods 78 are parallel to the corresponding side edge of the cuboid frame 11, and the fixed ends of the telescopic rods 78 are fixedly connected with the first connecting blocks 77;
- second connecting blocks 79, wherein the second connecting blocks 79 are fixedly connected to the telescopic ends of the telescopic rods 78, one side of the second connecting blocks 79 close to the corresponding side edge of the cuboid frame 11 is provided with a connecting bevel 710, and the connecting bevel 710 is in contact with the limiting balls 76.

In the embodiment, the telescopic rods 78 may be electric telescopic rods or manual telescopic rods.

Preferably, one side of the first connecting plates 72 in contact with the mirror 12 is provided with elastic connecting blocks.

The working principle and beneficial effects of the above technical solution are as follows:

- 1. When the mirror 12 is installed, firstly, the lower end of the mirror 12 is installed to the upper end of the inner rectangular frame 6. At this time, the corresponding first connecting plate 72 is located on the outer side of the corresponding side edge of the mirror 12, and then the corresponding telescopic rod 78 is controlled to shrink, to drive the corresponding second connecting block 79 to move close to the corresponding first connecting block 77. The connecting bevel 710 on the second connecting block 79 is matched with the limiting ball 76, to drive the limiting ball 76 and the second auxiliary connecting rod 75 connected with the limiting ball 76 to move close to the corresponding side edge of the mirror 12. The second auxiliary connecting rod 75 drives the second connecting plate 73, the first auxiliary connecting rod 71 and the first connecting plate 72 to move close to the corresponding side edge of the mirror 12. The corresponding side edge of the mirror 12 is clamped through the first connecting plate 72, and finally the peripheral sides of the mirror 12 are clamped through the first connecting plates 72 of the four auxiliary mechanisms 7, so that the mirror 12 is reliably limited. The contraction length of the telescopic rods 78 can be controlled in the embodiment to adapt to mirrors 12 of different lengths or widths.
- 2. In the technical solution, the telescopic rod 78 used to control clamping is located at the outer side of the cuboid frame 11, which has the advantages that the internal space of the cuboid frame 11 is not occupied and control is more convenient. Moreover, the telescopic rod 78 is arranged parallel to the side edge of the cuboid frame 11 instead of perpendicular to the side edge of the cuboid frame 11, so as to prevent the telescopic rod 78 from being too long and the cuboid frame 11 from not being too thick, which will affect the installation of the telescopic rod 78.

Embodiment 3: based on embodiment 2, as shown in FIGS. 4-6, the auxiliary mechanisms 7 further comprise:

- third auxiliary connecting rods 711, wherein one end of the third auxiliary connecting rods 711 is fixedly connected with one side of the second connecting plates 73 close to the corresponding first connecting plates 72;
- ventilation filter plates 712, wherein the ventilation filter plates 712 are fixedly connected with the other ends of the third auxiliary connecting rods 711, and the corresponding side edge of the cuboid frame 11 is provided with a communicating hole 111 through which the ventilation filter plates 712 slide.

Optionally, the middle part of the ventilation filter plate 712 is also provided with a micro cooling fan 713.

In the embodiment, the cuboid frame 11 can be dusted before the installation of the optical glass 13 and the mirror 12 to prevent the dust in the cuboid frame 11 from affecting the subsequent work of the optical imaging structure.

The working principle and beneficial effects of the above technical solution are as follows:

- 1. In an initial state, the ventilation filter plate 712 and the micro cooling fan 713 are located outside the cuboid frame 11, which is convenient for replacing and repairing the ventilation filter plate 712 and the micro cooling fan 713 outside the cuboid frame 11.
- 2. In the above solution, when the telescopic rod 78 is used for controlling the second auxiliary connecting rod 75 to drive the second connecting plate 73, the first auxiliary connecting rod 71 and the first connecting plate 72 to move close to the corresponding side edge of the mirror 12, the second connecting plate 73 also drives the ventilation filter plate 712 and the micro cooling fan 713 to enter the communicating hole 111. After the mirror 12 and the optical glass 13 are finally installed on the cuboid frame 11, a relatively sealed accommodating space is formed inside the cuboid frame 11 and the light-emitting elements 14 in the accommodating space need heat dissipation after operation for a long time. Therefore, the micro cooling fan 713 can be controlled to work to dissipate the heat in the accommodating space, and the ventilation filter plate 712 is arranged to prevent external dust from entering the accommodating space and affecting the subsequent work of the optical imaging structure.

Embodiment 4: based on any one of embodiments 1-3, as shown in FIGS. 4, 7 and 8, the upper part of the left side 113 of the cuboid frame and the upper part of the right side 114 of the cuboid frame are provided with opposite horizontal through hole structures 112; the left part of the optical glass 13 is connected in the horizontal through hole structure 112 at the left side 113 of the cuboid frame; the right part of the optical glass 13 is connected in the horizontal through hole structure 112 at the right side 114 of the cuboid frame; a part of the horizontal through hole structure 112 close to the inner side of the cuboid frame 11 is a first horizontal through hole 1121; a part of the horizontal through hole structure 112 close to the outer side of the cuboid frame 11 is a second horizontal through hole 1122; the first horizontal through hole 1121 is communicated with the second horizontal through hole 1122; and the height of the first horizontal through hole 1121 is less than the height of the second horizontal through hole 1122;

The optical glass 13 comprises: a glass body 132, wherein the left side and the right side of the glass body 132 are fixedly provided with first fixed blocks 131 respectively;

- two groups of upper and lower symmetric limiting structures 8 are arranged in each horizontal through hole structure 112, and the limiting structures 8 comprise:
- second fixed blocks 81, wherein the second fixed blocks 81 are fixedly connected to the inner wall of the second horizontal through hole 1122, and one side of the second fixed blocks 81 close to the optical glass 13 is provided with an elastic block 82;
- slide blocks 83, wherein the slide blocks 83 are slidably connected with the inner wall of the second horizontal through hole 1122, and second chutes 86 are arranged on the close sides of the opposite upper and lower slide blocks 83;
- slide rods 84, wherein the slide rods 84 are fixedly connected to one side of the slide blocks 83 close to the second fixed blocks 81, and the slide rods 84 are slidably connected into first chutes 85 in the second fixed blocks 81 along the left-right direction;
- second springs, wherein both ends of the second springs are fixedly connected with the inner walls of the first chutes 85 and the slide rods 84 respectively;
- limiting blocks 87, wherein the limiting blocks 87 are slidably connected in the second chutes 86 along the up-down direction, the close sides of the opposite upper and lower limiting blocks 87 are provided with arc limiting parts 88, and the arc limiting parts 88 are inserted into arc limiting grooves 89 at the upper or lower ends of the first fixed blocks 131;
- third springs, wherein both ends of the third springs are fixedly connected with the limiting blocks 87 and the inner walls of the second chutes 86 respectively;
- permanent magnets 810, wherein the permanent magnets 810 are arranged on one side of the limiting blocks 87 away from the arc limiting parts 88, and the inner walls of the second chutes 86 are provided with electromagnets 811 opposite to the permanent magnets 810.

In the present application, the mirror 12 may also be installed using the structure of the embodiment or installed by the above embodiment 3, wherein the upper and lower ends of the glass body 132 are flush with the upper and lower ends of the first fixed blocks 131;

In the embodiment, the sizes and shapes of the arc limiting parts 88 and the arc limiting grooves 89 are matched.

In the embodiment, a handle can be arranged on the outer side of the slide blocks 83 to facilitate the pulling of the slide blocks 83.

The working principle and beneficial effects of the above technical solution are as follows:

- 1. When the optical glass 13 is installed, firstly, the electromagnet 811 is controlled to work, so that the electromagnet 811 and the corresponding permanent magnet 810 directly attract each other to make the opposite upper and lower arc limiting parts 88 contract into the second chute 86. At this time, the corresponding third spring is compressed. Then, the optical glass 13 is inserted from the horizontal through hole structure 112 on the left side or the right side of the cuboid frame 11. After insertion, the corresponding electromagnet 811 is controlled to be powered off so that the opposite upper and lower arc limiting parts 88 are reset under the elastic force of the third spring. Thus, the arc limiting parts 88 are pressed tightly in the corresponding arc limiting grooves 89 to limit the optical glass 13. The optical glass 13 can be limited in the thickness direction through the opposite upper and lower arc limiting parts 88. The sizes and the shapes of the arc limiting parts 88 and the arc limiting grooves 89 are matched through the arc limiting parts 88 which are arranged in left and right, so as to further horizontally limit the optical glass 13.
- 2. In the embodiment, the first fixed blocks 131 are arranged on the left side and the right side of the glass body 132, and the first fixed blocks 131 are pressed through the arc limiting parts 88 instead of directly pressing the glass body 132, so as to avoid damaging the glass body 132. In the embodiment, the elastic blocks 82 are in direct contact with the upper and lower ends of the glass body 132 to avoid damaging the glass body 132.
- 3. In the embodiment, the slide blocks 83 can also be pulled so that the distance between the slide blocks 83 and the corresponding second fixed blocks 81 is changed. Thus, the first fixed blocks 131 at different positions in the left-right direction can be pressed, so as to adapt to the installation of the optical glass 13 with different sizes in the left-right direction.
- 4. In addition, the height of the first horizontal through hole 1121 is less than the height of the second horizontal through hole 1122, which can be convenient to manually adjust the positions of the second fixed blocks 81 in the second horizontal through hole 1122 with a larger space.

Embodiment 5: on the basis of any one of embodiment 1-4:

The peripheral inner side of the cuboid frame 11 is divided into a plurality of light-emitting regions; each light-emitting region is provided with a light-emitting element 14; each light-emitting region is provided with a first detection module; the first detection module is used for detecting first environmental parameters in the corresponding light-emitting region; and the first environmental parameters comprise: environmental brightness and environmental temperature.

The optical imaging structure further comprises:

- a timing module for timing the working time of the light-emitting elements 14 in the light-emitting regions;
- a power acquisition module for collecting the working power of the light-emitting elements 14;
- a storage module for storing the detection results of the first detection modules, the timing module and the power acquisition module;
- a control module, and an alarm module. The control module is electrically connected with the first detection modules, the timing module, the power acquisition module, the storage module and the alarm module respectively, and the control module controls the alarm module to work based on the first detection modules, the timing module, the power acquisition module and the storage module, comprising:

Based on the detection results of the timing module, the current first environmental parameters and the historical first environmental parameters stored in the storage module, the state coefficients of the light-emitting regions are calculated.

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