2D / 3D switchable integrated imaging display method and device

Abstract

According to the 2D / 3D switchable integrated imaging display method and device, the 3D image is displayed in the first display state through time division multiplexing, the 2D image is displayed in the second display state through time division multiplexing, the structure is simple, the display size can be adjusted according to an application scene, and multiple persons can watch the 3D image and the 2D image. The method comprises the following steps: taking micro-image array 3D image information displayed by projection display equipment as first image information; taking the 2D image information displayed by the projection display equipment as second image information; the first image information and the second image information are precisely coupled with the 2D / 3D display module, so that the 2D / 3D display module reconstructs the acquired image information and displays a 3D image and a 2D image in a time-sharing manner; the 2D / 3D display module is composed of a polarization converter, a quarter-wave plate, a geometric phase lens array I, a left-hand circular polarizer and a geometric phase lens array II. Wherein the polarization converter, the quarter-wave plate, the geometric phase lens array I, the left-hand circular polarizer and the geometric phase lens array II are tightly attached in sequence.

Description

Technical Field

[0001] The present invention relates to 2D / 3D switchable display technology and integrated imaging 3D display technology, and particularly designs a 2D / 3D switchable integrated imaging display method and device. Background Art

[0002] Integrated imaging 3D display offers advantages such as continuous viewing angles, zero visual fatigue, and the need for wearable devices. Therefore, it is considered one of the most promising naked-eye 3D display technologies. However, 2D display is a display method that people have long been accustomed to, and due to the lack of integrated imaging 3D display sources, integrated imaging 3D display devices must be able to simultaneously view 2D images while also providing 3D images. There is an urgent need for a 2D / 3D switchable integrated imaging display method and device. Existing 2D / 3D switching display methods and devices suffer from shortcomings such as complex structure, limited display size, and limitations on multi-person viewing. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to propose a 2D / 3D switchable integrated imaging display method and device, which displays 3D images in display state one and 2D images in display state two through time division multiplexing. The method and device have a simple structure, the display size can be adjusted according to the application scenario, and can be viewed by multiple people.

[0004] In order to solve the above technical problems, the present invention proposes a 2D / 3D switchable integrated imaging display method, which includes: using the 3D image information of the micro-image array displayed by the projection display device as the first image information; using the 2D image information displayed by the projection display device as the second image information; The first image information and the second image information are precisely coupled with the 2D / 3D display module, and the 2D / 3D display module reconstructs the acquired image information and displays the 3D image information and the 2D image information in a time-sharing manner; The 2D / 3D display module consists of a polarization converter, a quarter-wave plate, a geometric phase lens array I, a left-handed circular polarizer, and a geometric phase lens array II. These three components are tightly fitted together.

[0005] In display state one, the projection display device displays first image information, and the polarization converter converts the light displayed by the projection display device into horizontally polarized light. The horizontally polarized light is converted into left-handed circularly polarized light after passing through a quarter-wave plate. The left-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a convex lens array. The left-handed circularly polarized light is converted into right-handed circularly polarized light after passing through the geometric phase lens array I. The right-handed circularly polarized light then passes through the left-handed circular polarizer to convert the light into left-handed circularly polarized light. The left-handed circularly polarized light passes through the geometric phase lens array II again. At this time, the geometric phase lens array II also has the optical characteristics of a convex lens array; wherein the optical characteristics of the geometric phase lens array I and the geometric phase lens array II are both convex lens arrays and have the same focal length. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II are combined to form a lens element group. The focal length of the lens element group is positive. At this time, the 2D / 3D display module is equivalent to a composite lens array. The micro-image array in the first image information is calibrated so that the micro-image array is precisely coupled with the composite lens array in the 2D / 3D display module to reconstruct a 3D image, and the viewer can then view the 3D image.

[0006] In display state two, when the projection display device displays the second image information, the polarization converter converts the light displayed by the projection display device into vertically polarized light. The vertically polarized light is converted into right-handed circularly polarized light after passing through the quarter-wave plate. The right-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a concave lens array. The right-handed circularly polarized light is converted into left-handed circularly polarized light after passing through the geometric phase lens array I. The left-handed circularly polarized light is still left-handed circularly polarized light after passing through the left-hand circular polarizer. The left-handed circularly polarized light passes through the geometric phase lens array II. At this time, the geometric phase lens Array II has the optical characteristics of a convex lens array; the optical characteristics of the geometric phase lens array I and the geometric phase lens array II are respectively a convex lens array and a concave lens array, and the absolute values ​​of their focal lengths are equal. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II form a new lens element group, and the focal length of the new lens element group is zero. At this time, the 2D / 3D display module is equivalent to a transparent glass, and the 2D image information in the second image information is calibrated so that the 2D image information passes through the 2D / 3D display module and displays the 2D image information, so that the viewer can view the 2D image.

[0007] Preferably, the projection display device can be an LCD display, an OLED display, an LED display, a Micro-LED display, etc.

[0008] Preferably, the polarization converter may be a manually rotated linear polarizer, or an electrically controlled liquid crystal polarization converter, such as a TN liquid crystal cell.

[0009] Preferably, the geometric phase lens array consists of a plurality of lens elements.

[0010] Preferably, the lens elements in the geometric phase lens array may have the same or different sizes, and may be arranged with equal or unequal spacing. The parameters and structures of the lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II are exactly the same. Preferably, the lens elements in the geometric phase lens array may be square, circular, hexagonal, elliptical, rectangular, cylindrical or rhombus-shaped.

[0011] According to another aspect of the present invention, a 2D / 3D switchable integrated imaging display device is provided, comprising a projection display device and a 2D / 3D display module, wherein: The projection display device is used to project the micro-image array 3D image information and 2D image information onto the 2D / 3D display module; The 2D / 3D display module is composed of a polarization converter, a quarter-wave plate, a geometric phase lens array I, a left-handed circular polarizer and a geometric phase lens array II, and these devices are tightly fitted in sequence.

[0012] In display state one, the projection display device displays first image information, and the polarization converter converts the light displayed by the projection display device into horizontally polarized light. The horizontally polarized light is converted into left-handed circularly polarized light after passing through a quarter-wave plate. The left-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a convex lens array. The left-handed circularly polarized light is converted into right-handed circularly polarized light after passing through the geometric phase lens array I. The right-handed circularly polarized light then passes through the left-handed circular polarizer to convert the light into left-handed circularly polarized light. The left-handed circularly polarized light passes through the geometric phase lens array II again. At this time, the geometric phase lens array II also has the optical characteristics of a convex lens array; wherein the optical characteristics of the geometric phase lens array I and the geometric phase lens array II are both convex lens arrays and have the same focal length. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II are combined to form a lens element group. The focal length of the lens element group is positive. At this time, the 2D / 3D display module is equivalent to a composite lens array. The micro-image array in the first image information is calibrated so that the micro-image array is precisely coupled with the composite lens array in the 2D / 3D display module to reconstruct a 3D image, and the viewer can then view the 3D image.

[0013] In display state two, when the projection display device displays the second image information, the polarization converter converts the light displayed by the projection display device into vertically polarized light. The vertically polarized light is converted into right-handed circularly polarized light after passing through the quarter-wave plate. The right-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a concave lens array. The right-handed circularly polarized light is converted into left-handed circularly polarized light after passing through the geometric phase lens array I. The left-handed circularly polarized light is still left-handed circularly polarized light after passing through the left-hand circular polarizer. The left-handed circularly polarized light passes through the geometric phase lens array II. At this time, the geometric phase lens array Column II has the optical properties of a convex lens array; the optical properties of the geometric phase lens array I and the geometric phase lens array II are a convex lens array and a concave lens array, respectively, and the absolute values ​​of their focal lengths are equal. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II form a new lens element group, and the focal length of the new lens element group is zero. At this time, the 2D / 3D display module is equivalent to a transparent glass, and the 2D image information in the second image information is calibrated so that the 2D image information passes through the 2D / 3D display module and displays the 2D image information, so that the viewer can view the 2D image.

[0014] Preferably, the projection display device can be an LCD display, an OLED display, an LED display, a Micro-LED display, etc.

[0015] Preferably, the polarization converter may be a manually rotated linear polarizer, or an electrically controlled liquid crystal polarization converter, such as a TN liquid crystal cell.

[0016] Preferably, the geometric phase lens array consists of a plurality of lens elements.

[0017] Preferably, the lens elements in the geometric phase lens array may have the same or different sizes, and may be arranged with equal or unequal spacing. The parameters and structure of the lens elements at each corresponding position in the geometric phase lens array I and the geometric phase lens array II are exactly the same. Preferably, the lens elements in the geometric phase lens array may be square, circular, hexagonal, elliptical, rectangular, cylindrical or rhombus-shaped.

[0018] The present invention proposes a 2D / 3D switchable integrated imaging display method and device. By introducing devices such as a polarization converter and a geometric phase lens array to form a 2D / 3D display module, 2D and 3D images can be switched and displayed in time-division multiplexing based on the polarization characteristics of light. The method and device have the advantages of a simple structure, adjustable display size according to the application scenario, and multi-person viewing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1This is a flow chart of a 2D / 3D switchable integrated imaging display method proposed by the present invention.

[0020] Attachment Figure 2 This is a structural schematic diagram of a 2D / 3D switchable integrated imaging display device during 3D display proposed by the present invention.

[0021] Attachment Figure 3 This is a structural schematic diagram of a 2D / 3D switchable integrated imaging display device proposed by the present invention during 2D display.

[0022] The diagrams in the above drawings are numbered as follows: 1. Projection display device; 2. 2D / 3D display module; 3. Polarization converter; 4. Quarter-wave plate; 5. Geometric phase lens array I; 6. Left-handed circular polarizer; 7. Geometric phase lens array II; 8. Horizontally polarized light; 9. Left-handed circularly polarized light; 10. 3D image; 11. Viewer; 12. Vertically polarized light; 13. Right-handed circularly polarized light; 14. 2D image.

[0023] It should be understood that the above drawings are merely schematic and not drawn to scale. DETAILED DESCRIPTION

[0024] The following describes in detail a typical embodiment of a 2D / 3D switchable integrated imaging display method and apparatus of the present invention, further specifically describing the present invention. It is necessary to point out that the following embodiment is only used to further illustrate the present invention and is not to be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made by persons skilled in the art based on the above-mentioned disclosure are still within the scope of protection of the present invention.

[0025] The following will describe the 2D / 3D switchable integrated imaging display method proposed in this application in combination with the embodiments and drawings disclosed in this application. Figure 1 A flow chart of a 2D / 3D switchable integrated imaging display method according to an embodiment of the present application is shown, the method comprising: The 3D image 10 information displayed by the projection display device 1 is used as the first image information; the 2D image 14 information displayed by the projection display device 1 is used as the second image information. Preferably, the projection display device 1 uses an LCD display panel with a resolution of 3840×2160. The first image information and the second image information are precisely coupled to the 2D / 3D display module 2, so that the 2D / 3D display module 2 reconstructs the acquired image information and displays the 3D image 10 information and the 2D image 14 information in a time-sharing manner. The 2D / 3D display module 2 comprises a polarization converter 3, a quarter-wave plate 4, a geometric phase lens array I5, a left-handed circular polarizer 6, and a geometric phase lens array II7. Preferably, the polarization converter 3 uses a TN liquid crystal cell, the geometric phase lens array has a pitch of 30 μm, the lens element focal length is 5 mm, and the lens elements are square lenses. The polarization converter 3, quarter-wave plate 4, geometric phase lens array I5, left-handed circular polarizer 6, and geometric phase lens array II7 are tightly attached to each other.

[0026] In one embodiment, when the display state is one, the projection display device 1 displays the first image information, and the polarization converter 3 converts the light displayed by the projection display device 1 into horizontally polarized light. The horizontally polarized light is converted into left-handed circularly polarized light 9 after passing through the quarter-wave plate 4. The focal length of the lens element is 5 mm. The left-handed circularly polarized light 9 enters the geometric phase lens array I5. At this time, the geometric phase lens array I5 has the optical characteristics of a convex lens array. The left-handed circularly polarized light 9 is converted into right-handed circularly polarized light 13 after passing through the geometric phase lens array I5. The right-handed circularly polarized light 13 then passes through the left-handed circular polarizer 6 to convert the light. The left-handed circularly polarized light 9 is transformed into left-handed circularly polarized light 9, which passes through the geometric phase lens array II7 again. At this time, the geometric phase lens array II7 also has the optical characteristics of a convex lens array, and the focal length of its lens element is 5mm. The optical characteristics of the geometric phase lens array I5 and the geometric phase lens array II7 are both convex lens arrays with the same focal length. The lens elements corresponding to each position in the geometric phase lens array I5 and the geometric phase lens array II7 are combined to form a lens element group. The focal length of the lens element group is positive, and the focal length of the combined lens element group is 2.5mm. At this time, the 2D / 3D display module 2 is equivalent to a composite lens array. The micro-image array in the first image information is calibrated so that the micro-image array is precisely coupled with the composite lens array in the 2D / 3D display module 2 to reconstruct a 3D image 10. The viewer 11 can then view the 3D image, as shown in the attached figure. Figure 2 shown.

[0027] In one embodiment, when the display state is two, the projection display device 1 displays second image information, the polarization converter 3 converts the light displayed by the projection display device 1 into vertically polarized light 12, the vertically polarized light 12 is converted into right circularly polarized light 13 after passing through the quarter-wave plate 4, the right circularly polarized light 13 enters the geometric phase lens array I 5, at this time the geometric phase lens array I 5 has the optical characteristics of a concave lens array, the focal length of its lens elements is -5mm, the right circularly polarized light 13 is converted into left circularly polarized light 9 after passing through the geometric phase lens array I 5, the left circularly polarized light 9 still is left circularly polarized light 9 after passing through the left circularly polarized plate 6, the left circularly polarized light 9 passes through the geometric phase lens array II 7, at this time the geometric phase lens array II 7 has the optical characteristics of a convex lens array, the focal length of its lens elements is 5mm; wherein the optical characteristics of the geometric phase lens array I 5 and the geometric phase lens array II 7 are respectively a convex lens array and a concave lens array whose absolute values of focal lengths are equal, the lens elements corresponding to each position in the geometric phase lens array I 5 and the geometric phase lens array II 7 form new lens element groups, and the focal length of the new lens element group is zero, at this time the 2D / 3D display module 2 is equivalent to a transparent glass, the 2D image 14 information in the second image information is calibrated to make the 2D image 14 information pass through the 2D / 3D display module 2, the 2D image 14 information is displayed, and the viewer 11 can watch the 2D image, as shown in the accompanying drawings. Figure 3

[0028] Preferably, the projection display device 1 can be an LCD display screen, an OLED display screen, an LED display screen, a Micro-LED display screen, etc. Preferably, the polarization converter 3 can be a manually rotatable linear polarizer, or an electrically controlled liquid crystal polarization converter 3, such as a TN liquid crystal cell, etc. Preferably, the geometric phase lens array is composed of a plurality of lens elements. Preferably, the lens element sizes in the geometric phase lens array can be the same or different, and the arrangement can be equidistant or not equidistant, and the parameters and structures of the lens elements corresponding to each position in the geometric phase lens array I 5 and the geometric phase lens array II 7 are exactly the same; preferably, the lens elements in the geometric phase lens array can be square, circular, hexagonal, elliptical, rectangular, cylindrical or diamond-shaped.

[0029] ​According to an embodiment of the present application, a 2D / 3D switchable integrated imaging display device includes a projection display device 1 and a 2D / 3D display module 2, wherein: the projection display device 1 is used to project micro-image array 3D image 10 information and 2D image 14 information to the 2D / 3D display module 2; the 2D / 3D display module 2 is composed of a polarization converter 3, a quarter-wave plate 4, a geometric phase lens array I5, a left-handed circular polarizer 6, and a geometric phase lens array II7, and these devices are tightly fitted in sequence. Preferably, the projection display device 1 uses an LCD display panel with a resolution of 3840×2160, the polarization converter 3 uses a TN-type liquid crystal cell, the pitch of the geometric phase lens array is 30μm, the lens element focal length is 5mm, and the lens element is a square lens.

[0030] In one embodiment, when the display state is one, in one embodiment, when the display state is one, the projection display device 1 displays the first image information, and the polarization converter 3 converts the light displayed by the projection display device 1 into horizontally polarized light 8. The horizontally polarized light 8 is converted into left-handed circularly polarized light 9 after passing through the quarter-wave plate 4. The focal length of its lens element is 5mm. The left-handed circularly polarized light 9 enters the geometric phase lens array I5. At this time, the geometric phase lens array I5 has the optical characteristics of a convex lens array. The left-handed circularly polarized light 9 is converted into right-handed circularly polarized light 13 after passing through the geometric phase lens array I5. The right-handed circularly polarized light 13 is then converted into left-handed circularly polarized light 13. The oscillator 6 converts the light into left-handed circularly polarized light 9, which then passes through the geometric phase lens array II7 again. At this time, the geometric phase lens array II7 also has the optical characteristics of a convex lens array, and the focal length of its lens element is 5 mm. The optical characteristics of the geometric phase lens array I5 and the geometric phase lens array II7 are both convex lens arrays with the same focal length. The lens elements at each corresponding position in the geometric phase lens array I5 and the geometric phase lens array II7 are combined to form a lens element group. The focal length of the lens element group is positive, and the focal length of the combined lens element group is 2.5 mm. At this time, the 2D / 3D display module 2 is equivalent to a composite lens array. The micro-image array in the first image information is calibrated so that the micro-image array is precisely coupled with the composite lens array in the 2D / 3D display module 2 to reconstruct a 3D image 10. The viewer 11 can then view the 3D image, as shown in the attached figure. Figure 2 shown.

[0031] In one embodiment, when the second display state is displayed, when the projection display device 1 displays the second image information, the polarization converter 3 converts the light displayed by the projection display device 1 into vertically polarized light. The vertically polarized light is converted into right-handed circularly polarized light 13 after passing through the quarter-wave plate 4. The right-handed circularly polarized light 13 enters the geometric phase lens array I5. At this time, the geometric phase lens array I5 has the optical characteristics of a concave lens array, and the focal length of its lens element is -5mm. The right-handed circularly polarized light 13 is converted into left-handed circularly polarized light 9 after passing through the geometric phase lens array I5. The left-handed circularly polarized light 9 is still left-handed circularly polarized light 9 after passing through the left-hand circular polarizer 6. The left-handed circularly polarized light 9 passes through the geometric phase lens array II7. At this time, the geometric The phase lens array II7 has the optical characteristics of a convex lens array, and the focal length of its lens element is 5 mm; the optical characteristics of the geometric phase lens array I5 and the geometric phase lens array II7 are respectively a convex lens array and a concave lens array, and the absolute values ​​of their focal lengths are equal. The lens elements corresponding to each position in the geometric phase lens array I5 and the geometric phase lens array II7 form a new lens element group, and the focal length of the new lens element group is zero. At this time, the 2D / 3D display module 2 is equivalent to a transparent glass, and the 2D image 14 information in the second image information is calibrated so that the 2D image 14 information passes through the 2D / 3D display module 2 and displays the 2D image 14 information. The viewer 11 can then view the 2D image, as shown in the attached figure. Figure 3 shown.

[0032] Preferably, the projection display device 1 can be an LCD display, an OLED display, an LED display, a Micro-LED display, etc. Preferably, the polarization converter 3 can be a manually rotated linear polarizer, or an electrically controlled liquid crystal polarization converter 3, such as a TN liquid crystal cell, etc. Preferably, the geometric phase lens array is composed of a plurality of lens elements. Preferably, the lens elements in the geometric phase lens array can be the same or different in size, and can be arranged with equal or unequal spacing. The parameters and structure of the lens elements in each corresponding position in the geometric phase lens array I5 and the geometric phase lens array II7 are exactly the same; preferably, the lens elements in the geometric phase lens array can be square, circular, hexagonal, elliptical, rectangular, cylindrical or diamond-shaped.

Claims

1. A 2D / 3D switchable integrated imaging display method, characterized in that: The method comprises: using the 3D image information of the micro-image array displayed by the projection display device as the first image information; using the 2D image information displayed by the projection display device as the second image information; The first image information and the second image information are precisely coupled to the 2D / 3D display module, so that the 2D / 3D display module reconstructs the acquired image information and displays the 3D image information and the 2D image information in a time-sharing manner; The 2D / 3D display module is composed of a polarization converter, a quarter-wave plate, a geometric phase lens array I, a left-handed circular polarizer, and a geometric phase lens array II. The polarization converter, the quarter-wave plate, the geometric phase lens array I, the left-handed circular polarizer, and the geometric phase lens array II are tightly combined in sequence. In display state one, the projection display device displays first image information, and the polarization converter converts the light displayed by the projection display device into horizontally polarized light. The horizontally polarized light is converted into left-handed circularly polarized light after passing through a quarter-wave plate. The left-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a convex lens array. The left-handed circularly polarized light is converted into right-handed circularly polarized light after passing through the geometric phase lens array I. The right-handed circularly polarized light then passes through the left-handed circular polarizer to convert the light into left-handed circularly polarized light. The left-handed circularly polarized light passes through the geometric phase lens array II again. At this time, the geometric phase lens array II also has the optical characteristics of a convex lens array; wherein the optical characteristics of the geometric phase lens array I and the geometric phase lens array II are both convex lens arrays and have the same focal length. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II are combined to form a lens element group. The focal length of the lens element group is positive. At this time, the 2D / 3D display module is equivalent to a composite lens array. Calibrate the micro-image array in the first image information so that the micro-image array is precisely coupled with the composite lens array in the 2D / 3D display module to reconstruct a 3D image so that the viewer can view the 3D image; In display state two, when the projection display device displays the second image information, the polarization converter converts the light displayed by the projection display device into vertically polarized light. The vertically polarized light is converted into right-handed circularly polarized light after passing through the quarter-wave plate. The right-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a concave lens array. The right-handed circularly polarized light passes through the geometric phase lens array I and is converted into left-handed circularly polarized light. The left-handed circularly polarized light remains left-handed circularly polarized light after passing through the left-hand circular polarizer. The left-handed circularly polarized light passes through the geometric phase lens array II. At this time, the geometric phase lens array II Array II has the optical properties of a convex lens array; the optical properties of the geometric phase lens array I and the geometric phase lens array II are that the absolute values ​​of the focal lengths are equal when they are convex lens arrays and concave lens arrays, respectively. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II form a new lens element group, and the focal length of the new lens element group is zero. At this time, the 2D / 3D display module is equivalent to a transparent glass, and the 2D image information in the second image information is calibrated so that the 2D image information passes through the 2D / 3D display module and displays the 2D image information, so that the viewer can view the 2D image.

2. The method according to claim 1, wherein The projection display device can be an LCD display, an OLED display, an LED display, or a Micro-LED display.

3. The method according to claim 1, wherein The polarization converter can be a manually rotated linear polarizer or an electrically controlled liquid crystal polarization converter.

4. The method according to claim 1, wherein The geometric phase lens array is composed of a plurality of lens elements.

5. The method according to claim 1, wherein The parameters and structure of the lens elements at each corresponding position in the geometric phase lens array I and the geometric phase lens array II are exactly the same.

6. The method according to claim 1, wherein The lens elements in the geometric phase lens array may be square, circular, hexagonal, elliptical, rectangular, cylindrical or rhombus-shaped.

7. A 2D / 3D switchable integrated imaging display device, characterized in that: The 2D / 3D switchable integrated imaging display device comprises a projection display device and a 2D / 3D display module, wherein: The projection display device is used to project the micro-image array 3D image information and 2D image information onto the 2D / 3D display module; The 2D / 3D display module consists of a polarization converter, a quarter-wave plate, a geometric phase lens array I, a left-handed circular polarizer, and a geometric phase lens array II, which are tightly fitted together in sequence. In display state one, the projection display device displays first image information, and the polarization converter converts the light displayed by the projection display device into horizontally polarized light. The horizontally polarized light is converted into left-handed circularly polarized light after passing through a quarter-wave plate. The left-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a convex lens array. The left-handed circularly polarized light is converted into right-handed circularly polarized light after passing through the geometric phase lens array I. The right-handed circularly polarized light then passes through the left-handed circular polarizer to convert the light into left-handed circularly polarized light. The left-handed circularly polarized light passes through the geometric phase lens array II again. At this time, the geometric phase lens array II also has the optical characteristics of a convex lens array; wherein the optical characteristics of the geometric phase lens array I and the geometric phase lens array II are both convex lens arrays and have the same focal length. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II are combined to form a lens element group, and the focal length of the lens element is positive. At this time, the 2D / 3D display module is equivalent to a composite lens array. Calibrate the micro-image array in the first image information so that the micro-image array is precisely coupled with the composite lens array in the 2D / 3D display module to reconstruct a 3D image so that the viewer can view the 3D image; In the second display state, when the projection display device displays the second image information, the polarization converter converts the light displayed by the projection display device into vertically polarized light. The vertically polarized light is converted into right-handed circularly polarized light after passing through the quarter-wave plate. The right-handed circularly polarized light enters the geometric phase lens array I. At this time, the geometric phase lens array I has the optical characteristics of a concave lens array. The right-handed circularly polarized light is converted into left-handed circularly polarized light after passing through the geometric phase lens array I. The left-handed circularly polarized light is still left-handed circularly polarized light after passing through the left-hand circular polarizer. The left-handed circularly polarized light passes through the geometric phase lens array II. At this time, the geometric phase lens array Column II has the optical properties of a convex lens array; the optical properties of the geometric phase lens array I and the geometric phase lens array II are respectively a convex lens array and a concave lens array, and the absolute values ​​of their focal lengths are equal. The lens elements corresponding to each position in the geometric phase lens array I and the geometric phase lens array II are combined to form a new lens element group, and the focal length of the new lens element group is zero. At this time, the 2D / 3D display module is equivalent to a transparent glass, and the 2D image information in the second image information is calibrated so that the 2D image information passes through the 2D / 3D display module and displays the 2D image information, so that the viewer can view the 2D image.

8. The apparatus of claim 7, wherein the projection display device is configured to project 3D image information and 2D image information of the micro-image array onto the 2D / 3D display module; in display state one, the 2D / 3D display module has the optical properties of a lens array, and the projection display device projects the micro-image array to reconstruct a 3D image, thereby achieving 3D display; in display state two, the 2D / 3D display module acts as transparent glass, and the projection display device projects a 2D image to achieve 2D display.

9. The apparatus as claimed in claim 7, wherein the projection display device can be an LCD display, an OLED display, an LED display, or a Micro-LED display.

10. The device according to claim 7, wherein the polarization converter can be a manually rotatable linear polarizer or an electrically controlled liquid crystal polarization converter.

11. The device as claimed in claim 7, wherein the geometric phase lens array is composed of a plurality of lens elements.

12. The device as claimed in claim 7, wherein the parameters and structure of the lens elements at each corresponding position in the geometric phase lens array I and the geometric phase lens array II are exactly the same.

13. The device as claimed in claim 7, wherein the lens elements in the geometric phase lens array can be square, circular, hexagonal, elliptical, rectangular, cylindrical or diamond-shaped.

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