Aerial imaging display device

Abstract

An aerial imaging display device comprises an image display module and a pixel light field regulation and control screen arranged on the light emitting side of the image display module, image light emitted by the image display module forms a virtual image in the air after passing through the pixel light field regulation and control screen, the virtual image is composed of a plurality of space pixels, the pixel light field regulation and control screen comprises a plurality of body pixels, and the body pixels are arranged on the pixel light field regulation and control screen. Each body pixel comprises a plurality of diffraction pixels, each body pixel transmits image light to the diffraction pixel of the same space pixel, the diffraction pixel is defined as the same coding pixel, and the image light of the same coding pixel of different body pixels is transmitted to the same space pixel of the virtual image surface. Different coding pixels of the same body pixel transmit image light to corresponding space pixels of a virtual image face in a one-to-one correspondence mode, each diffraction pixel is composed of a diffraction structure, the diffraction pixels of the body pixels are different in orientation angle and / or period, and the same coding pixel of each body pixel is different in orientation angle and / or period. The aerial imaging display device can realize medium-free space depth display.

Description

Technical Field

[0001] This invention relates to the field of display device technology, and in particular to an aerial imaging display device. Background Technology

[0002] With the development of display technology, traditional flat panel displays have transitioned to multi-dimensional, multi-spatial stereoscopic displays and augmented reality displays, resulting in increasing diversity and innovation in displays. The arrival of the metaverse era has driven disruptive changes in display methods across multiple fields and industries. Many manufacturers are now developing transparent displays, which display images on screens that are transparent under visible light. This allows users to see both the information on the screen and the real space behind it, offering significant applications in exhibitions and smart displays. However, it is essentially still a flat panel display and has not brought about a revolutionary change in display technology. Some manufacturers have proposed floating displays, which use multiple reflections to make the image surface float in space. This novel and unique display method has great application potential in automotive displays and exhibitions. However, to achieve floating displays, the display devices or equipment need to be relatively large, requiring a certain amount of space to conduct light, which limits some application markets. Summary of the Invention

[0003] In view of this, the present invention provides an aerial imaging display device that can realize spatial depth display without a medium, and is small in size and has less crosstalk.

[0004] An aerial imaging display device includes an image display module and a pixel light field control screen disposed on the light-emitting side of the image display module. The image light emitted by the image display module forms a virtual image in the air after passing through the pixel light field control screen. The virtual image is composed of multiple spatial pixels arranged in a matrix. The pixel light field control screen includes multiple volume pixels. Each diffraction pixel of each volume pixel is used to provide image light to each spatial pixel. The diffraction pixels of the same spatial pixel that transmit image light from each volume pixel are defined as the same coded pixel. The image light of the same coded pixel of different volume pixels is transmitted to the same spatial pixel of the virtual image surface. Different coded pixels of the same volume pixel transmit image light to the corresponding spatial pixel of the virtual image surface one by one. All spatial pixels are combined to form a virtual image. Each diffraction pixel is composed of a diffraction structure. The orientation angle and / or period of each diffraction pixel of each volume pixel are different. The orientation angle and / or period of the same coded pixel of each volume pixel are different.

[0005] In an embodiment of the present invention, a first direction and a second direction are defined to be parallel to the light-emitting surface of the pixel light field control screen, the first direction is perpendicular to the second direction, and a plurality of volume pixels are arranged in a matrix along the first direction and the second direction.

[0006] In an embodiment of the present invention, each volume pixel includes a plurality of horizontal pixel groups arranged sequentially along the second direction, and each horizontal pixel group includes a plurality of diffractive pixels arranged sequentially along the first direction; each volume pixel includes a plurality of vertical pixel groups arranged sequentially along the first direction, and each vertical pixel group includes a plurality of diffractive pixels arranged sequentially along the second direction.

[0007] In embodiments of the present invention, the number of diffraction pixels of each volume pixel is the same as the number of spatial pixels of the virtual image, and they correspond one-to-one.

[0008] In an embodiment of the present invention, the pixel light field control screen includes a substrate and a diffraction structure formed on the surface of the substrate, wherein a single volume pixel is composed of diffraction structures with different orientations and periods.

[0009] In an embodiment of the present invention, the substrate is attached to the light-emitting surface of the image display module, or the substrate is disposed opposite to the light-emitting surface of the image display module.

[0010] In an embodiment of the present invention, the diffraction structure described above is a nanograting structure.

[0011] In an embodiment of the present invention, the image display module includes a backlight and a display panel. The backlight is used to provide directional light with a divergence angle to the display panel, and the display panel is used to provide dynamic display image information to the pixel light field control screen.

[0012] In an embodiment of the present invention, the light emitted by each volume pixel converges in front of the aerial imaging display device and then diverges out, with the virtual image located in front of the aerial imaging display device, or the light emitted by each volume pixel diverges out in front of the aerial imaging display device, with the virtual image located behind the aerial imaging display device.

[0013] In an embodiment of the present invention, the virtual image is parallel to the pixel light field control screen, or there is an angle between the virtual image and the pixel light field control screen.

[0014] The aerial imaging display device of this invention displays image information at a certain depth position in real space through a compact module similar to a flat panel display, achieving medium-free spatial depth display. This application achieves crosstalk-free virtual screen display through pixel-by-pixel light transmission control of the pixel light field modulation screen. The aerial imaging display device of this application is small in size and has low crosstalk, possessing great market application potential. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the aerial imaging display device according to the first embodiment of this application.

[0016] Figure 2 This is a schematic diagram of a virtual image being formed in front of the pixel light field control screen according to the first embodiment of this application.

[0017] Figure 3 This is a schematic diagram of light transmission in the horizontal direction of the pixel light field control screen of this application.

[0018] Figure 4 This is a schematic diagram of the vertical light transmission of the pixel light field control screen of this application.

[0019] Figure 5 This is a schematic diagram of the diffraction structure of this application.

[0020] Figure 6 This is a schematic diagram of a virtual image being formed in front of the pixel light field control screen according to the second embodiment of this application.

[0021] Figure 7 This is a schematic diagram of a virtual image being formed behind the pixel light field control screen according to the third embodiment of this application. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0023] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may also be used, and changes in mechanical composition, structure, electrical and operational aspects may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for describing particular embodiments only and is not intended to limit the present application.

[0024] Although the terms first, second, etc., are used in some instances to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0025] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

[0026] First Embodiment

[0027] Figure 1 This is a schematic diagram of the structure of the aerial imaging display device according to the first embodiment of this application. Figure 2 This is a schematic diagram of a virtual image formed in front of the pixel light field control screen according to the first embodiment of this application, as shown below. Figure 1 and Figure 2 As shown, the aerial imaging display device includes an image display module 12 and a pixel light field control screen 13 disposed on the light-emitting side of the image display module 12. The image light emitted by the image display module 12 forms a virtual image 20 in the air after passing through the pixel light field control screen 13. The virtual image 20 is composed of multiple spatial pixels 201 arranged in a matrix. The pixel light field control screen 13 includes multiple volume pixels 101. Each diffraction pixel 1011 of each volume pixel 101 is used to provide image light to each spatial pixel 201. Each volume pixel 101 conducts image light to the diffraction pixel 1011 of the same spatial pixel 201. 011 is defined as the same coded pixel, where the image light of the same coded pixel of different volume pixels 101 is transmitted to the same spatial pixel 201 on the surface of the virtual image 20. Different coded pixels of the same volume pixel 101 are transmitted one-to-one to the corresponding spatial pixel 201 on the surface of the virtual image 20. All spatial pixels 201 are combined to form the virtual image 20. Each diffraction pixel 1011 is composed of a diffraction structure. The orientation angle and / or period of each diffraction pixel 1011 of each volume pixel 101 is different. The orientation angle and / or period of the same coded pixel of each volume pixel 101 is different.

[0028] In this embodiment, each diffraction pixel 1011 is used to control the transmission direction of image light; the diffraction structure of each diffraction pixel 1011 of the pixel light field control screen 13 is different, so that the image light controlled by each diffraction pixel 1011 is accurately transmitted to the corresponding spatial pixel 201 of the virtual image 20, ensuring that each spatial pixel 201 of the virtual image 20 can emit light at a certain divergence angle, and the observer's eye can see the virtual image 20 within a certain range after receiving the light. The number of diffraction pixels 1011 of each pixel 101 is the same as the number of spatial pixels 201 of the virtual image 20, and they correspond one-to-one.

[0029] The aerial imaging display device of this application displays image information at a certain depth position in real space through a compact module similar to a flat panel display, achieving medium-free spatial depth display. This application achieves crosstalk-free virtual screen display through pixel-by-pixel light transmission control of the pixel light field modulation screen 13. The aerial imaging display device of this application is small in size and has low crosstalk, possessing enormous market application prospects. Facing the development trend of the metaverse, aerial imaging display will realize a diversified, intelligent, and medium-free screen-based revolutionary display method in many fields such as science and technology exhibitions, museum exhibitions, smart cities, education and entertainment, automotive displays, and office displays.

[0030] Optionally, such as Figure 2 As shown, a first direction X and a second direction Y are defined as parallel to the light-emitting surface of the pixel light field control screen 13, and the first direction X is perpendicular to the second direction Y. Multiple volume pixels 101 are arranged in a matrix along the first direction X and the second direction Y. In this embodiment, the light-emitting surface of the pixel light field control screen 13 is composed of multiple volume pixels 101 arranged in a matrix.

[0031] Optionally, each volume pixel 101 includes a plurality of horizontal pixel groups arranged sequentially along the second direction Y, and each horizontal pixel group includes a plurality of diffractive pixels 1011 arranged sequentially along the first direction X; each volume pixel 101 includes a plurality of vertical pixel groups arranged sequentially along the first direction X, and each vertical pixel group includes a plurality of diffractive pixels 1011 arranged sequentially along the second direction Y. In this embodiment, each horizontal pixel group has M diffractive pixels 1011, and each vertical pixel group has N diffractive pixels 1011, therefore each volume pixel 101 has M×N diffractive pixels 1011, where M and N are both positive integers.

[0032] Optionally, Figure 3 This is a schematic diagram of the horizontal light transmission of the pixel light field modulation screen of this application, as shown below. Figure 3As shown, the image light emitted from multiple horizontal pixel groups arranged along the first direction by multiple volume pixels 101 forms a local area of ​​the virtual image 20 displayed along the first direction in the air, wherein the image light of the same coded pixel in different horizontal pixel groups is transmitted to the same spatial pixel 201 on the surface of the virtual image 20.

[0033] Optionally, Figure 4 This is a schematic diagram of the vertical light transmission of the pixel light field modulation screen of this application, as shown below. Figure 4 As shown, the image light emitted from multiple vertical pixel groups arranged along the second direction by multiple volume pixels 101 forms a local area of ​​the virtual image 20 displayed along the second direction in the air, wherein the image light of the same coded pixel in different vertical pixel groups is transmitted to the same spatial pixel 201 on the surface of the virtual image 20.

[0034] In this embodiment, the arrangement position of the same coded pixel in each volume pixel 101 is the same, but it is not limited to this. In other embodiments, the arrangement position of the same coded pixel in each volume pixel 101 may also be different. It is only necessary to adjust the image light emitted by the image display module 12 accordingly.

[0035] Optionally, the pixel light field control screen 13 includes a substrate and a diffraction structure formed on the surface of the substrate, and each individual pixel 101 is composed of diffraction structures with different orientations and periods. In this embodiment, the diffraction structure can be prepared by methods such as photolithography, etching, and imprinting; the substrate material is resin or glass, but is not limited thereto.

[0036] Optionally, the substrate is attached to the light-emitting surface of the image display module 12, or the substrate is positioned opposite to the light-emitting surface of the image display module 12.

[0037] Optionally, Figure 5 This is a schematic diagram of the diffraction structure of this application, as shown below. Figure 5 As shown, the diffraction structure is a nanograting structure. When incident light enters the nanograting at an incident angle α and an azimuth angle Ф1, according to the diffraction characteristics of a vector grating, it will exit at a diffraction angle β and an azimuth angle Ф2. Changes in the orientation of the nanograting can control the change in the diffraction azimuth angle. Changes in the period of the nanograting can control the change in the diffraction angle. Therefore, based on the spatial pixel 201 position and incident conditions of the virtual image 20, the period and orientation angle data of the diffraction structure on the pixel light field control screen 13 are obtained, thereby achieving high-precision transmission control of light passing through the diffraction structure.

[0038] Furthermore, considering multiple nano-grating structures as a diffraction pixel 1011, the aerial imaging display device of this application can also realize color graphic display. Specifically, the diffraction structure of the diffraction pixel 1011 is composed of a first grating, a second grating, and a third grating corresponding to three RGB wavelengths. The period, orientation, and azimuth angle of the first grating, the second grating, and the third grating are calculated by the grating equation based on the position of the spatial pixel 201, the incident conditions, and the corresponding wavelength of the colored light.

[0039] Optionally, such as Figure 1 As shown, the image display module 12 includes a backlight 121 and a display panel 122. The backlight 121 provides directional light with a divergence angle to the display panel 122, and the display panel 122 provides dynamic image information to the pixel light field control screen 13. In this embodiment, the display panel 122 is, for example, a liquid crystal panel or an OLED panel, and can be freely rotated according to actual needs.

[0040] Optionally, the light emitted by each volume pixel 101 converges in front of the aerial imaging display device and then diverges outward, with the virtual image 20 located in front of the aerial imaging display device. In this embodiment, the same coded pixels of different volume pixels 101 converge to the same spatial pixel 201 and then diverge, forming a certain range of spatial pixel 201 divergence angles, so that the observer can see the virtual image 20 within a certain range.

[0041] Optionally, such as Figure 1 and Figure 2 As shown, the virtual image 20 is parallel to the pixel light field control screen 13.

[0042] Second Embodiment

[0043] Figure 6 This is a schematic diagram of a virtual image formed in front of the pixel light field control screen according to the second embodiment of this application, as shown below. Figure 6 As shown, the aerial imaging display device in this embodiment is largely the same as the aerial imaging display device in the first embodiment, except that the structure of the pixel light field control screen 13 is different. Based on the properties of the diffraction structure described above, by adjusting the period and orientation of the diffraction structure, the position where the light rays of the same coded pixel of each volume pixel 101 converge can be controlled, thereby changing the position of the virtual image 20. In this embodiment, there is an angle between the virtual image 20 and the pixel light field control screen 13.

[0044] This embodiment controls the position of light convergence of the same coded pixel of each pixel 101 to be different; for example, the aerial imaging display device is placed horizontally and the virtual image 20 is on the side of the screen. At this time, the virtual image 20 is set in the vertical direction, that is, the angle between the virtual image 20 and the pixel light field control screen 13 is 90°, and the observer creates a medium-free air display effect when observing the virtual image 20.

[0045] Third Embodiment

[0046] Figure 7 This is a schematic diagram of a virtual image formed behind the pixel light field modulation screen according to the third embodiment of this application, as shown below. Figure 7 As shown, the aerial imaging display device in this embodiment is largely the same as the aerial imaging display device in the above embodiment, except that the structure of the pixel light field control screen 13 is different. In this embodiment, the light emitted by each pixel 101 diverges out in front of the aerial imaging display device, and the virtual image 20 is located behind the aerial imaging display device. In this embodiment, the light from the same coded pixel of each pixel 101 diverges towards the observer. The observer's eye collects the diverging light and then converges it in the opposite direction, so that the virtual image 20 is observed behind the aerial imaging display device.

[0047] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. An aerial imaging display device, characterized in that, The system includes an image display module and a pixel light field control screen disposed on the light-emitting side of the image display module. The image light emitted by the image display module forms a virtual image in the air after passing through the pixel light field control screen. The virtual image is composed of multiple spatial pixels arranged in a matrix. The pixel light field control screen includes multiple volume pixels, and each volume pixel includes multiple diffraction pixels arranged in a matrix. The diffraction pixels of each volume pixel that conduct image light to the same spatial pixel are defined as the same coded pixel. The image light of the same coded pixels of different volume pixels is conducted to the same spatial pixel on the virtual image surface. Different coded pixels of the same volume pixel conduct image light to the corresponding spatial pixels on the virtual image surface. All the spatial pixels are combined to form the virtual image. Each diffraction pixel is composed of a diffraction structure. The orientation angle and / or period of each diffraction pixel of each volume pixel are different. The orientation angle and / or period of the same coded pixel of each volume pixel are different.

2. The aerial imaging display device as described in claim 1, characterized in that, A first direction and a second direction are defined to be parallel to the light-emitting surface of the pixel light field control screen. The first direction is perpendicular to the second direction, and a plurality of volume pixels are arranged in a matrix along the first direction and the second direction.

3. The aerial imaging display device as described in claim 2, characterized in that, Each volume pixel includes a plurality of horizontal pixel groups arranged sequentially along the second direction, and each horizontal pixel group includes a plurality of diffractive pixels arranged sequentially along the first direction; each volume pixel includes a plurality of vertical pixel groups arranged sequentially along the first direction, and each vertical pixel group includes a plurality of diffractive pixels arranged sequentially along the second direction.

4. The aerial imaging display device as described in claim 1, characterized in that, The number of diffraction pixels in each volume pixel is the same as the number of spatial pixels in the virtual image, and they correspond one-to-one.

5. The aerial imaging display device as claimed in claim 1, characterized in that, The pixel light field control screen includes a substrate and a diffraction structure formed on the surface of the substrate. Each volume pixel is composed of diffraction structures with different orientations and periods.

6. The aerial imaging display device as described in claim 5, characterized in that, The substrate is attached to the light-emitting surface of the image display module, or the substrate is disposed opposite to the light-emitting surface of the image display module.

7. The aerial imaging display device as claimed in claim 1, characterized in that, The diffraction structure is a nanograting structure.

8. The aerial imaging display device as claimed in claim 1, characterized in that, The image display module includes a backlight and a display panel. The backlight is used to provide directional light with a divergence angle to the display panel, and the display panel is used to provide dynamic display image information to the pixel light field control screen.

9. The aerial imaging display device according to any one of claims 1 to 8, characterized in that, The light emitted by each of the volume pixels converges in front of the aerial imaging display device and then diverges outward, with the virtual image located in front of the aerial imaging display device, or the light emitted by each of the volume pixels diverges outward in front of the aerial imaging display device, with the virtual image located behind the aerial imaging display device.

10. The aerial imaging display device according to any one of claims 1 to 8, characterized in that, The virtual image is parallel to the pixel light field control screen, or there is an angle between the virtual image and the pixel light field control screen.

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