Airborne display device

Abstract

An aerial display device includes a display element (11) that displays an image, and a prism element (12) that reflects light from the display element (11) to display the image in the air on the side opposite to the display element (11). The prism element (12) includes a plurality of elemental prisms (20) arranged in a horizontal plane. The elemental prisms (20) are formed of hexahedrons including first and second refractive surfaces that refract light and first and second reflective surfaces that reflect light. The first refractive surface corresponds to a bottom surface of the hexahedron and is inclined with respect to a first direction parallel to the horizontal plane. The second refractive surface corresponds to a top surface of the hexahedron and is inclined with respect to the first direction. The first reflective surface corresponds to one side surface of the hexahedron and is parallel to a normal direction. The second reflective surface corresponds to another side surface of the hexahedron, is continuous with the first reflective surface, and is parallel to the normal direction.

Description

Technical Field

[0001] This invention relates to an aerial display device for displaying images in the air. Background Technology

[0002] Research is underway on aerial display devices capable of displaying images or animations as aerial images, with the expectation that they will become a new human-machine interface. For example, aerial display devices utilize dihedral reflectors arranged in an array to reflect light emitted from display elements, thus displaying images in the air. The display method using dihedral reflector arrays can display images at symmetrical positions without aberrations.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-67933 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The present invention provides an air display device that can be miniaturized.

[0008] Methods for solving problems

[0009] According to a first aspect of the present invention, an aerial display device is provided, comprising: a display element for displaying an image; and a prism element for reflecting light from the display element to display the image in the air on the opposite side of the display element. The prism element includes a plurality of element prisms arranged in a horizontal plane. Each of the plurality of element prisms is formed of a hexahedron, including a first refractive surface and a second refractive surface for refracting light, and a first reflective surface and a second reflective surface for reflecting light. The first refractive surface corresponds to the bottom surface of the hexahedron and is inclined relative to a first direction parallel to the horizontal plane. The second refractive surface corresponds to the top surface of the hexahedron and is inclined relative to the first direction. The first reflective surface corresponds to one side surface of the hexahedron and is parallel to the normal direction. The second reflective surface corresponds to the other side surface of the hexahedron, is in contact with the first reflective surface, and is parallel to the normal direction.

[0010] According to a second aspect of the present invention, in the air display device of the first aspect, the first refractive surface is tilted at 45 degrees relative to the first direction, and the second refractive surface is tilted at 45 degrees relative to the first direction.

[0011] According to a third aspect of the present invention, in the air display device of the first aspect, when viewed from above, the first reflective surface is tilted relative to the first direction, and when viewed from above, the second reflective surface is tilted relative to the first direction.

[0012] According to a fourth aspect of the present invention, in a third-party air display device, the first reflective surface is tilted at 45 degrees relative to the first direction, and the second reflective surface is tilted at 45 degrees relative to the first direction.

[0013] According to a fifth aspect of the present invention, in the air display device of the first aspect, the first reflective surface and the second reflective surface are arranged in a mutually orthogonal manner.

[0014] According to a sixth aspect of the present invention, in the air display device of the first aspect, the aforementioned prism element is made of a light-transmitting material.

[0015] According to a seventh aspect of the present invention, the air display device of the first aspect further includes an illumination element that emits light, wherein the display element is a liquid crystal display element, and light from the illumination element is transmitted through it.

[0016] According to an eighth aspect of the present invention, an aerial display device is provided, comprising: a display element for displaying an image; and a prism element for reflecting light from the display element to display the image in the air on the opposite side of the display element. The prism element includes: a substrate; a plurality of element prisms disposed on the bottom surface of the substrate and arranged in a horizontal plane; and a plurality of refractive elements disposed on the upper surface of the substrate for refracting light. The plurality of element prisms are each formed of a hexahedron, including a refractive surface for refracting light and a first reflective surface and a second reflective surface for reflecting light. The refractive surface corresponds to the bottom surface of the hexahedron and is inclined relative to a first direction parallel to the horizontal plane. The first reflective surface corresponds to one side of the hexahedron and is parallel to the normal direction. The second reflective surface corresponds to the other side of the hexahedron, is in contact with the first reflective surface, and is parallel to the normal direction. The plurality of refractive elements are arranged side by side in the first direction and extend in the horizontal plane along a second direction orthogonal to the first direction, and are each formed of a triangular prism.

[0017] According to a ninth aspect of the present invention, in the air display device of the eighth aspect, the aforementioned refractive surface is tilted at 45 degrees relative to the aforementioned first direction.

[0018] According to a tenth aspect of the present invention, in the air display device of the eighth aspect, the plurality of refractive components each have a refractive surface tilted at 45 degrees relative to the first direction.

[0019] According to the eleventh aspect of the present invention, in the air display device of the eighth aspect, when viewed from above, the first reflective surface is tilted relative to the first direction, and when viewed from above, the second reflective surface is tilted relative to the first direction.

[0020] According to the twelfth aspect of the present invention, in the air display device of the eleventh aspect, the first reflective surface is tilted at 45 degrees relative to the first direction, and the second reflective surface is tilted at 45 degrees relative to the first direction.

[0021] According to the thirteenth aspect of the present invention, in the air display device of the eighth aspect, the first reflective surface and the second reflective surface are arranged in a mutually orthogonal manner.

[0022] According to the fourteenth aspect of the present invention, in the air display device of the eighth aspect, the prism element is made of a light-transmitting material.

[0023] According to the fifteenth aspect of the present invention, the air display device of the eighth aspect further includes an illumination element that emits light, wherein the display element is a liquid crystal display element, and light from the illumination element is transmitted through it.

[0024] Invention Effects

[0025] According to the present invention, an air display device capable of miniaturization can be provided. Attached Figure Description

[0026] Figure 1 This is a perspective view of the aerial display device according to the embodiment.

[0027] Figure 2A It is a three-dimensional diagram of a prism element.

[0028] Figure 2B This is a top view of a portion of the prism element.

[0029] Figure 2C This is a side view of the prism element.

[0030] Figure 3A It is a three-dimensional diagram of an elemental prism.

[0031] Figure 3B This is a top view of the element prism.

[0032] Figure 3C This is a side view of the element prism.

[0033] Figure 4 This is a block diagram of an aerial display device.

[0034] Figure 5 This is a schematic diagram illustrating the operation of the air display device.

[0035] Figure 6A This is a schematic diagram illustrating the operation of the element prism.

[0036] Figure 6B This is a schematic diagram illustrating the operation of the element prism.

[0037] Figure 6C This is a schematic diagram illustrating the operation of the element prism.

[0038] Figure 7A This is a perspective view of the prism element in the first embodiment.

[0039] Figure 7B This is a side view of the prism element in the first embodiment.

[0040] Figure 7C This is a bottom view of a portion of the prism element in the first embodiment.

[0041] Figure 8A This is a perspective view of the prism element in the second embodiment.

[0042] Figure 8B This is a side view of the prism element in the second embodiment.

[0043] Figure 9 This is a diagram illustrating the manufacturing method of the prism element in the second embodiment. Detailed Implementation

[0044] Hereinafter, embodiments will be described with reference to the accompanying drawings. However, the drawings are schematic or conceptual, and the dimensions and ratios of each drawing may not be the same as in reality. Furthermore, even when the drawings represent the same parts, there may be cases where the dimensional relationships and ratios are expressed differently. In particular, the embodiments shown below exemplify apparatus and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not determined by the shape, structure, or arrangement of the constituent parts. In addition, in the following description, elements having the same function and structure are given the same reference numerals, and repeated descriptions are omitted.

[0045] [1] Composition of the air display device 1

[0046] Figure 1 This is a perspective view of the aerial display device 1 according to the embodiment. Figure 1 The X direction is along one side of the air display device 1, the Y direction is the direction orthogonal to the X direction in the horizontal plane, and the Z direction is the direction orthogonal to the XY plane (also called the normal direction).

[0047] The aerial display device 1 includes an illumination element 10, a display element 11, and a prism element 12. The illumination element 10, display element 11, and prism element 12 are arranged sequentially along the Z-direction, and their respective principal surfaces are arranged parallel to each other. Figure 1In the figure, multiple elements constituting the air display device 1 are shown floating, but these elements (illumination element 10, display element 11, and prism element 12) are fixed in the position shown in the figure by a support member not shown.

[0048] The illumination element 10 emits illumination light and directs it toward the display element 11. The illumination element 10 is composed of a surface light source. For example, the illumination element 10 is composed of a side-lamp type (edge-lamp type) backlight. The illumination element 10 includes a light source section 10A and a light guide plate 10B. The light source section 10A is disposed on the side of the light guide plate 10B and emits illumination light toward the side of the light guide plate 10B. The light guide plate 10B directs the illumination light from the light source section 10A toward the display element 11. The light source section 10A includes, for example, a plurality of light-emitting diodes (LEDs) that emit white light.

[0049] Display element 11 is a transmissive display element. Display element 11 may be composed of, for example, a liquid crystal display element. The driving mode of display element 11 is not particularly limited; TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, or homogeneous mode may be used. Display element 11 receives illumination light emitted from illumination element 10. Display element 11 modulates the light by transmitting the illumination light. Then, display element 11 displays the desired image and / or animation on its display surface.

[0050] Prism element 12 receives the display light transmitted through display element 11. By refracting and reflecting the display light, prism element 12 displays an aerial image in the air on the opposite side of display element 11. An observer on the opposite side of prism element 12 can visually confirm the display light reflected by prism element 12.

[0051] [2] Specific composition of prism element 12

[0052] Next, the specific structure of the prism element 12 will be explained. Figure 2A This is a three-dimensional view of prism element 12. Figure 2B This is a top view of a portion of the prism element 12. Figure 2C This is a side view of the prism element 12, and it is a view of the prism element 12 viewed in the Y direction.

[0053] The prism element 12 comprises a plurality of element prisms 20 arranged along the X and Y directions. The element prisms 20 are spaced apart from each other and arranged in a zigzag (houndstooth) pattern. That is, the element prisms 20 are configured such that one row extends at a 45-degree angle relative to the X direction, and multiple rows are arranged at a 45-degree angle relative to the Y direction. The element prisms 20 are light-transmitting, for example, made of acrylic resin.

[0054] Figure 3A It is a stereoscopic view of element prism 20. Figure 3B It is a top view of element prism 20, and a view of element prism 20 as observed in the XY plane. Figure 3C It is a side view of element prism 20, and is a diagram of element prism 20 viewed in the XZ plane.

[0055] Each element prism 20 is composed of a hexahedron. The element prism 20 includes two refracting surfaces 20A and 20B, and two reflecting surfaces 20C and 20D. Refracting surface 20A corresponds to the bottom surface of the hexahedron, refracting surface 20B corresponds to the top surface of the hexahedron, and reflecting surfaces 20C and 20D correspond to the side surfaces of the hexahedron. Reflecting surfaces 20C and 20D are parallel to the Z-direction (normal direction). Reflecting surfaces 20C and 20D are connected to each other, for example, arranged at a 90-degree angle. Figure 3B As shown, the four sides of the hexahedron are arranged at an angle of 90 degrees, for example. When viewed from above, the reflecting surface 20C is tilted at an angle θ1 relative to the X direction. Angle θ1 is, for example, 45 degrees. Similarly, when viewed from above, the reflecting surface 20D is tilted at an angle θ1 relative to the Y direction. Furthermore, angle θ1 is not limited to 45 degrees and can be set within a range of 30 degrees to 60 degrees.

[0056] like Figure 3C As shown, the refractive surface 20A is inclined at an angle θ2 relative to the X direction, and is further inclined such that the size of the element prism 20 increases towards the line where the reflecting surfaces 20C and 20D meet. The refractive surface 20B is inclined at an angle θ3 relative to the X direction, and is further inclined such that the size of the element prism 20 increases towards the line where the reflecting surfaces 20C and 20D meet. Angles θ2 and θ3 are, for example, 45 degrees. Angles θ2 and θ3 are set to be the same. However, angles θ2 and θ3 are not limited to 45 degrees, and can be set within a range of 30 degrees to 60 degrees.

[0057] Refracting surfaces 20A and 20B respectively have the function of refracting light through the interface. Reflecting surfaces 20C and 20D respectively have the function of reflecting light through the interface.

[0058] Alternatively, a reflective film can be provided between adjacent element prisms 20, and the adjacent element prisms 20 are connected through the reflective film. This allows multiple element prisms 20 to be fixed integrally.

[0059] Alternatively, the element prisms 20 can be configured such that minute irregularities are formed locally on their sides, and adjacent element prisms 20 are partially connected through these irregularities. In this case, multiple element prisms 20 can also be integrally fixed.

[0060] [3] Block diagram of the air display device 1

[0061] Figure 4 This is a block diagram of an airborne display device 1. The airborne display device 1 includes an illumination element 10, a display element 11, a prism element 12, a display driving circuit 14, a voltage generating circuit 15, and a control circuit 16.

[0062] The display driving circuit 14 supplies signals to the display element 11 to drive the display element 11. Then, the display driving circuit 14 causes the display element 11 to display images and / or animations.

[0063] The voltage generating circuit 15 generates various voltages required for the lighting element 10 and the display driving circuit 14 to operate, and supplies these voltages to the lighting element 10 and the display driving circuit 14.

[0064] The control circuit 16 controls the overall operation of the aerial display device 1. That is, the control circuit 16 controls the illumination element 10, the display driving circuit 14, and the voltage generating circuit 15. Then, the control circuit 16 causes the aerial image 13 to be displayed at the desired display position.

[0065] [4] Actions

[0066] The operation of the air display device 1 configured as described above will be explained. Figure 5 This is a schematic diagram illustrating the operation of the air display device 1.

[0067] Illumination element 10 emits illumination light toward display element 11. Display element 11 transmits the illumination light emitted from illumination element 10 and displays images and / or animations. Prism element 12 displays an aerial image 13 by refracting and reflecting the display light emitted from display element 11. Figure 5 In the image, the black circle on the lighting element 10 indicates the position where the lighting light is emitted, and the black circle in the aerial image 13 indicates the position where the display light is imaged.

[0068] Figures 6A to 6C This is a schematic diagram illustrating the operation of element prism 20. Figure 6A It is a three-dimensional view of element prism 20. Figure 6B It is a top view of element prism 20, and a view of element prism 20 as observed in the XY plane. Figure 6C It is a side view of element prism 20, and is a diagram of element prism 20 viewed in the XY plane.

[0069] Light emitted from display element 11 is incident on and refracted by the refractive surface 20A of element prism 20. At this point, the angle of incidence > the angle of refraction. Next, the light transmitted through refractive surface 20A is reflected twice by reflective surfaces 20C and 20D. Then, the light reflected by reflective surfaces 20C and 20D is incident on and refracted by refractive surface 20B. At this point, the angle of incidence < the angle of refraction. The light transmitted through refractive surface 20B images the aerial image 13.

[0070] exist Figures 6A to 6C In the diagram, the lower black circle represents the light source, and the upper black circle represents the image position of the light. Figures 6A to 6C In the diagram, white squares represent the positions where light refracts, and white circles represent the positions where light is reflected. An aerial image 13 is formed at a position symmetrical to the light source relative to the element prism 20.

[0071] [5] Embodiment of prism element 12

[0072] Next, an embodiment of the prism element 12 will be described. Figure 7A This is a perspective view of the prism element 12 in the first embodiment. Figure 7B This is a side view of the prism element 12 of the first embodiment, and is a view of the prism element 12 viewed in the Y direction. Figure 7C This is a bottom view of a portion of the prism element 12 in the first embodiment.

[0073] The prism element 12 includes multiple element prisms 20, a substrate 21, and multiple refractive elements 22. The multiple element prisms 20, the substrate 21, and the multiple refractive elements 22 are transparent and are made of, for example, acrylic resin.

[0074] The substrate 21 is a plate-shaped component extending along the XY plane. The planar shape of the substrate 21 is quadrilateral.

[0075] Multiple element prisms 20 are disposed on the bottom surface of the substrate 21. Each element prism 20 is composed of a hexahedron. In addition to its horizontally formed upper surface, the element prisms 20 are configured to interact with the substrate. Figures 3A-3C The element prism 20 has the same configuration as described above. That is, the element prism 20 includes the refractive surface 20B and the reflective surfaces 20C and 20D. The upper surface of the element prism 20 is in contact with the bottom surface of the substrate 21. The arrangement of the plurality of element prisms 20 is also the same as described above. Figure 2A The elements described in the text are the same as those in the prism.

[0076] A plurality of refractive elements 22 are provided on the upper surface of the substrate 21. The plurality of refractive elements 22 are arranged in the X direction. Each refractive element 22 is composed of a triangular prism extending along the Y direction. The refractive element 22 has a refractive surface 22A. The refractive surface 22A is arranged obliquely with respect to the X direction and is formed in such an oblique manner that the size of the refractive element 22 increases toward the X direction. For example, the refractive surface 22A is formed at an oblique angle of 45 degrees with respect to the X direction. The refractive surface 22A of the refractive element 22 has the same function as the refractive surface 20B corresponding to the upper surface of the aforementioned element prism 20.

[0077] The prism element 12 of the first embodiment, configured as described above, can achieve the same operation as the prism element described in the embodiment. Furthermore, Figure 7A The prism element 12 can also be configured such that the refractive component 22 is located on the lower side and the top and bottom are opposite.

[0078] Figure 8A This is a perspective view of the prism element 12 in the second embodiment. Figure 8B This is a side view of the prism element 12 of the second embodiment, and is a view of the prism element 12 viewed in the Y direction.

[0079] The prism element 12 includes multiple element prisms 20, a first substrate 21, multiple first refractive elements 22, a second substrate 23, and multiple second refractive elements 24. The multiple element prisms 20, the first substrate 21, the multiple first refractive elements 22, the second substrate 23, and the multiple second refractive elements 24 are light-transmitting and are made of, for example, acrylic resin. The first substrate 21 and the multiple first refractive elements 22 have the same configuration as in the first embodiment.

[0080] Multiple element prisms 20 are constructed from square prisms. Each element prism 20 has the function of reflecting light twice. The element prisms 20, like those in the above embodiment, include reflecting surfaces 20C and 20D. The arrangement of the multiple element prisms 20 is also similar to that in... Figure 2A The element described in the text is the same as prism 20.

[0081] The second substrate 23 is a plate-shaped component extending along the XY plane. The planar shape of the second substrate 23 is quadrilateral. The bottom surface of the element prism 20 is in contact with the upper surface of the second substrate 23.

[0082] A plurality of second refractive elements 24 are provided on the bottom surface of the second substrate 23. The plurality of second refractive elements 24 are arranged in the X direction. Each second refractive element 24 is composed of a triangular prism extending along the Y direction. The second refractive element 24 has a refractive surface 24A. The refractive surface 24A is arranged obliquely with respect to the X direction and is formed in such an oblique manner that the size of the second refractive element 24 increases towards the X direction. For example, the refractive surface 24A is formed at an oblique angle of 45 degrees with respect to the X direction. The refractive surface 24A of the second refractive element 24 has the same function as the refractive surface 20A corresponding to the bottom surface of the aforementioned element prism 20.

[0083] The prism element 12 of the second embodiment, configured as described above, can perform the same operation as the prism element described in the embodiment.

[0084] Next, an example of a method for manufacturing the prism element 12 of the second embodiment will be described. Figure 9 This is a diagram illustrating the manufacturing method of the prism element 12 in the second embodiment.

[0085] like Figure 9 As shown in (a), multiple elemental prisms 20, a first substrate 21, and multiple first refractive elements 22 are integrally formed to form a first optical element 12A. Next, as... Figure 9 As shown in (b), the second substrate 23 and a plurality of second refractive elements 24 are integrally formed to form the second optical element 12B.

[0086] Next, a transparent adhesive 25 is applied to the upper surface of the second substrate 23. Then, the first optical element 12A and the second optical element 12B are bonded together via the adhesive 25. Thus, a [structure / form] is formed. Figure 8B The prism element 12 shown.

[0087] [6] Effects of the implementation method

[0088] As described in detail above, in this embodiment, the air display device 1 includes an illumination element 10, a display element 11, and a prism element 12. The illumination element 10, display element 11, and prism element 12 are arranged sequentially along the normal direction and with their respective principal surfaces parallel. The illumination element 10 and display element 11 direct display light toward the prism element 12 along the normal direction. The prism element 12 refracts and reflects the display light from the display element 11, displaying an image and / or animation in the space opposite to the display element 11.

[0089] Therefore, according to the embodiment, it is not necessary to arrange the illumination element 10 and the display element 11 at an angle relative to the prism element 12. This allows for the realization of an aerial display device 1 that can be miniaturized in the normal direction while maintaining the display quality of the aerial image. Furthermore, it allows for the realization of an aerial display device 1 that can also be miniaturized in the horizontal direction.

[0090] In the above embodiment, a liquid crystal display element is used as an example of the display element, but other display elements such as self-emissive organic EL (electroluminescence) display elements can also be used. When using an organic EL display element, the illumination element 10 is omitted.

[0091] This invention is not limited to the embodiments described above, and various modifications can be made during implementation without departing from its spirit. Furthermore, the embodiments can be appropriately combined, in which case combined effects can be obtained. Moreover, since the above embodiments include various inventions, various inventions can be extracted by selecting combinations from a plurality of disclosed constituent elements. For example, if the problem can be solved and an effect obtained by deleting several constituent elements from all the constituent elements shown in the embodiments, the configuration in which those constituent elements are deleted can also be extracted as an invention.

Claims

1. An airborne display device, comprising: Display elements, displaying images; and A prism element reflects light from the display element, displaying an image in the air on the opposite side of the display element. The aforementioned prism element comprises multiple elemental prisms arranged in a horizontal plane. The aforementioned prisms are each formed of a hexahedron, including a first refractive surface and a second refractive surface that refract light, and a first reflective surface and a second reflective surface that reflect light. The aforementioned first refractive surface corresponds to the bottom surface of the aforementioned hexahedron and is inclined within a range of 30 degrees to 60 degrees relative to a first direction parallel to the aforementioned horizontal plane. The second refractive surface corresponds to the upper surface of the hexahedron and is inclined relative to the first direction within a range of 30 degrees to 60 degrees. The first reflecting surface mentioned above corresponds to one side of the hexahedron and is parallel to the normal direction orthogonal to the horizontal plane. The second reflecting surface corresponds to another side of the hexahedron, is in contact with the first reflecting surface, and is parallel to the normal direction.

2. The air display device as claimed in claim 1, wherein, The aforementioned first refractive surface is inclined at 45 degrees relative to the aforementioned first direction. The second refractive surface is tilted at 45 degrees relative to the first direction.

3. The air display device as claimed in claim 1, wherein, When viewed from above, the aforementioned first reflective surface is tilted relative to the aforementioned first direction. When viewed from above, the second reflective surface is tilted relative to the first direction.

4. The air display device as claimed in claim 3, wherein, The aforementioned first reflective surface is tilted at 45 degrees relative to the aforementioned first direction. The second reflective surface is tilted at 45 degrees relative to the first direction.

5. The air display device as claimed in claim 1, wherein, The first reflective surface and the second reflective surface are arranged orthogonally to each other.

6. The air display device as claimed in claim 1, wherein, The aforementioned prism element is made of a light-transmitting material.

7. The air display device as claimed in claim 1, wherein, It also has a light-emitting lighting element. The aforementioned display element is a liquid crystal display element, which allows light from the aforementioned lighting element to be transmitted.

8. An airborne display device, comprising: Display elements, displaying images; and A prism element reflects light from the display element, displaying an image in the air on the opposite side of the display element. The aforementioned prism element includes: substrate; Multiple element prisms are disposed on the bottom surface of the aforementioned substrate and arranged in a horizontal plane; as well as Multiple refractive components are disposed on the upper surface of the substrate to refract light. The aforementioned prism elements are each formed of a hexahedron, including a refracting surface that refracts light and a first reflecting surface and a second reflecting surface that reflect light. The aforementioned refractive surface corresponds to the bottom surface of the aforementioned hexahedron and is inclined within a range of 30 degrees to 60 degrees relative to the first direction parallel to the aforementioned horizontal plane. The first reflecting surface mentioned above corresponds to one side of the hexahedron and is parallel to the normal direction orthogonal to the horizontal plane. The second reflecting surface corresponds to another side of the hexahedron, is connected to the first reflecting surface, and is parallel to the normal direction. The aforementioned multiple refractive components are arranged side by side in the first direction and extend in the horizontal plane along a second direction orthogonal to the first direction, and are each composed of a triangular prism.

9. The air display device as claimed in claim 8, wherein, The aforementioned refractive surface is tilted at 45 degrees relative to the aforementioned first direction.

10. The air display device as claimed in claim 8, wherein, The aforementioned multiple refractive components each have a refractive surface tilted at 45 degrees relative to the aforementioned first direction.

11. The air display device as claimed in claim 8, wherein, When viewed from above, the aforementioned first reflective surface is tilted relative to the aforementioned first direction. When viewed from above, the second reflective surface is tilted relative to the first direction.

12. The air display device as claimed in claim 11, wherein, The aforementioned first reflective surface is tilted at 45 degrees relative to the aforementioned first direction. The second reflective surface is tilted at 45 degrees relative to the first direction.

13. The air display device as claimed in claim 8, wherein, The first reflective surface and the second reflective surface are arranged orthogonally to each other.

14. The air display device as claimed in claim 8, wherein, The aforementioned prism element is made of a light-transmitting material.

15. The air display device as claimed in claim 8, wherein, It also has a light-emitting lighting element. The aforementioned display element is a liquid crystal display element, which allows light from the aforementioned lighting element to be transmitted.

Images