Large viewing angle integrated imaging 3D display device based on secondary light field control

Abstract

The present invention proposes a large-viewing-angle integrated imaging 3D display device based on secondary light field regulation. The device consists of a 2D display device, a light field guiding layer and a light field reconstruction layer. The 2D display screen is located at the bottom layer of the device, and the light field guiding layer and the light field reconstruction layer are located above. The 2D display screen is used to display an interleaved coded micro-image array, and provide an interleaved light field with different visual area information for the upper structure of the device. The light field guiding layer performs the first light field regulation to modulate the light emitted by the 2D display screen, and guides and separates the interleaved light fields with different visual area information in space. The light field reconstruction layer performs the second light field regulation to reconstruct the separated light beams modulated by the spliced ​​light field guiding layer, so as to achieve the expansion of the 3D viewing angle.

Description

Technical Field

[0001] The present invention belongs to the technical field of three-dimensional display, and in particular relates to a large-viewing-angle integrated imaging 3D display device based on secondary light field regulation. Background Art

[0002] Integrated imaging technology is a simple, efficient, high-performance naked-eye 3D display technology. It does not rely on additional visual aids, and can provide depth information only through the precise coupling of the lens array and the image array. It is considered to be a very promising stereoscopic display technology with great application potential in many fields such as medicine, military, and education. In integrated imaging technology, viewing angle is a key indicator. A wider viewing angle can restore as much real information of the object as possible and support multiple viewers to watch at the same time. Unfortunately, in the field of integrated imaging technology, narrow viewing angle is still a technical disadvantage. As shown in the attached figure, Figure 1 As shown, traditional integrated imaging has a periodic structure, which results in a periodic arrangement of the primary viewing area and the secondary viewing area in the display space, and the same information content is displayed in each viewing area, which not only limits the display viewing angle, but also causes a waste of display space.

[0003] At present, there are some technical solutions for increasing the viewing angle. The human eye tracking method can obtain the viewer's position and update the 3D image of the corresponding position in real time, but this method cannot support multiple people watching at the same time, and only improves the viewing experience of a single person. Curved display devices and lens arrays can avoid the above-mentioned shortcomings of human eye tracking, but this method places huge demands on the manufacturing process of the display panel and the lens array, and the curved 3D display device is prone to image distortion, the overall stability of the device is poor, and it lacks the characteristics of convenience. Time division multiplexing technology cooperates with the display panel through the rapid response of optical devices to increase the lens aperture or image element pitch in the time dimension to increase the viewing angle. However, in this type of method, the high refresh rate of optoelectronic devices, the precise movement of mechanical structures, or the complex structure of the system are all difficult to overcome. Among the current methods for increasing the viewing angle, none of them starts from the principle of the viewing area of ​​integrated imaging itself, and most of them focus on expanding the range of the main viewing area. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a large viewing angle integrated imaging 3D display device based on secondary light field regulation. The device is composed of a 2D display screen, a light field guiding layer and a light field reconstruction layer. Figure 2As shown, the 2D display screen is located at the bottom layer of the device, and upwards are the light field guiding layer and the light field reconstruction layer. The 2D display screen is used to display an interleaved coded micro-image array, providing an interleaved light field with different visual area information for the upper structure of the device. The light field guiding layer is a microlens array, which is used to modulate the light emitted by the 2D display screen, and guide and separate the interleaved light fields with different visual area information in space. The light field reconstruction layer is a large lens array, which is used to receive the separated light beams modulated by the light field guiding layer, and reconstruct the separated light beams in different directions into separated visual areas respectively, and merge these separated visual areas at the same time to achieve the expansion of the 3D viewing angle.

[0005] The interlaced coded micro-image array is composed of a plurality of interlaced micro-image elements, each of which is composed of m sub-pixels of a 2D display screen and contains partial light field information in all separated viewing areas.

[0006] The light field guiding layer is a micro lens array, located above the 2D display screen, and is composed of a plurality of micro lenses with the same parameters, and performs the first light field regulation on the light emitted by the 2D display screen. Figure 3 As shown, each microlens modulates n sub-pixels in an interlaced micro-image element it covers, and light emitted by sub-pixels at different positions in each interlaced micro-image element is refracted by the microlens to generate separated light beams in n directions.

[0007] Preferably, the 2D display screen is located at the focal plane below the light field guiding layer to reduce the divergence angle of the separated light beams and avoid crosstalk between adjacent light beams during secondary light field modulation.

[0008] Preferably, the number n of sub-pixels modulated by the microlens should be less than 30, so as to reduce the influence of the edge aberration of the microlens on the light modulation, while ensuring that the pitch of the large lens array is not too large to reduce the 3D display effect.

[0009] The light field reconstruction layer is a large lens array, located above the light field guiding layer, and is composed of multiple large lenses with the same parameters, which performs a second light field regulation on the light emitted by the 2D display screen. Figure 4 As shown in FIG. 1 , the n-directional separated light beams generated by the light field guiding layer are irradiated to n adjacent large lenses respectively. At the same time, each large lens is The illumination of the separated light beams refracted by adjacent microlenses. When designing the parameters, ensure is an integer. Each large lens refracts and converges the separated light beams to form n adjacent separated viewing areas. By adjusting the 3D content of these n separated viewing areas, the n separated viewing areas can be merged into a complete viewing area. The viewing angle θ of the complete viewing area can be calculated by formula (1):

[0010]

[0011] Among them, pd is the sub-pixel width of the 2D display screen, and d is the distance between the light field guiding layer and the light field reconstruction layer.

[0012] As attached Figure 5 As shown, in order to ensure that the light field information of different separated viewing areas can be accurately separated and reconstructed, the sub-pixel parameters, light field guide layer parameters and light field reconstruction layer parameters need to meet the following requirements:

[0013]

[0014]

[0015] Among them, f l and p l is the focal length and pitch of the light field guiding layer, Q L is the pitch of the light field reconstruction layer.

[0016] Preferably, the centers of the 2D display screen, the light field guiding layer and the light field reconstruction layer are aligned so that the width of a single separated light beam just illuminates one large lens, ensuring that each large lens does not reconstruct the separated light beam illuminating the adjacent large lens.

[0017] Preferably, the distance d between the light field guiding layer and the light field reconstruction layer is not less than To ensure that the separate light beams irradiating the same large lens can completely overlap.

[0018] The present invention proposes a large-viewing angle integrated imaging 3D display device based on secondary light field regulation, which uses a method of displaying different contents in multiple viewing areas and then splicing and reorganizing to expand the display viewing angle. The 2D display screen displays an interlaced coded micro-image array, providing an interlaced light field with different viewing area information. The light field guiding layer performs a light field regulation to guide and separate the outgoing light of the sub-pixels in the interlaced micro-image element to form multiple separated light beams. The light field reconstruction layer performs a secondary light field regulation to reconstruct the separated light beams into separated viewing areas, and then uses them to display continuous 3D information in different separated viewing areas to effectively expand the viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the field of view of a conventional integrated imaging device is provided.

[0020] Figure 2 This is a schematic diagram of the structure of a large-viewing-angle integrated imaging 3D display device based on secondary light field control proposed in the present invention.

[0021] Figure 3 Schematic diagram of the modulation of sub-pixel light by the microlens.

[0022] Figure 4 Schematic diagram of reconstructing different viewing zones for the split beam light field guiding layer.

[0023] Figure 5 Schematic diagram of merging separated visual areas of the device of the present invention.

[0024] The diagram numbers in the above drawings are:

[0025] 1 Main viewing area of ​​a traditional integrated imaging device, 2 Secondary viewing area of ​​a traditional integrated imaging device, 3 Micro-image array of a traditional integrated imaging device, 4 Traditional lens array, 500 2D display screen, 501 2D display screen sub-pixel, 600 Light field guiding layer, 601 Micro-lens, 7 Separated light beams, 800 Light field reconstruction layer, 801 Large lens, 9 Separated viewing area, 10 Complete viewing area.

[0026] It should be understood that the above drawings are only schematic and are not drawn to scale. DETAILED DESCRIPTION

[0027] A typical embodiment of the large viewing angle integrated imaging 3D display device based on secondary light field control of the present invention is described in detail below, and the present invention is further described in detail. It is necessary to point out here that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Personnel skilled in the art in this field may make some non-essential improvements and adjustments to the present invention based on the above content of the present invention, which still fall within the scope of protection of the present invention.

[0028] Please refer to the attached figure for the structural diagram of a large viewing angle integrated imaging 3D display device based on secondary light field control in this example. Figure 2 As shown, it includes a 2D display device, a light field guiding layer and a light field reconstruction layer. The 2D display screen is located at the bottom layer of the device, and the light field guiding layer and the light field reconstruction layer are located above. The 2D display screen is used to display an interleaved encoded micro-image array, and provide an interleaved light field with different visual area information for the upper structure of the device. The light field guiding layer is a microlens array, which is used to modulate the light emitted by the 2D display screen, and guide and separate the interleaved light fields with different visual area information in space. The light field reconstruction layer is a large lens array, which is used to receive the separated light beams modulated by the light field guiding layer, and reconstruct the separated light beams in different directions into separated visual areas respectively, and merge these separated visual areas at the same time to achieve the expansion of the 3D viewing angle.

[0029] In this example, the interleaved coded micro-image array is composed of a plurality of interleaved micro-image elements, each of which is composed of 49 sub-pixels with a width of 0.03 mm for a 2D display screen with a resolution of 3840×2160, and contains partial light field information in all separated viewing areas.

[0030] In this example, the light field guiding layer is a microlens array, and the rear focal plane is located at the 2D display screen. It is composed of multiple microlenses with a focal length of 0.30 mm and a pitch of 0.22 mm, and performs the first light field regulation on the light emitted by the 2D display screen. Each microlens modulates the 7 sub-pixels in an interlaced micro-image element it covers, and the light emitted by the sub-pixels at different positions in each interlaced micro-image element is refracted by the microlens to generate separate light beams in 7 directions.

[0031] In this example, the light field reconstruction layer is located 6.30 mm above the light field guiding layer. It is composed of multiple large lenses with a focal length of 0.50 mm and a pitch of 0.63 mm. It performs a second light field regulation on the light emitted by the 2D display screen. The separated light beams in 7 directions generated by the light field guiding layer are respectively irradiated to 7 adjacent large lenses. At the same time, each large lens is irradiated by the separated light beams refracted by 7 adjacent microlenses. Each large lens refracts and converges the separated light beams to form 7 adjacent separated viewing areas. By adjusting the 3D content of these 7 separated viewing areas, they can be merged into a complete viewing area. The viewing angle of the complete viewing area is 78.4°, which can be calculated by formula (1):

[0032]

[0033] Among them, p d is the sub-pixel width of the 2D display screen, and d is the distance between the light field guiding layer and the light field reconstruction layer.

[0034] As attached Figure 5 As shown, to ensure that the light field information of the separated viewing area can be accurately separated and reconstructed, the sub-pixel parameters, light field guide layer parameters and light field reconstruction layer parameters satisfy:

[0035]

[0036]

[0037] Among them, f l and p l is the focal length and pitch of the light field guiding layer, Q L is the pitch of the light field reconstruction layer.

[0038] The present invention proposes a large-viewing angle integrated imaging 3D display device based on secondary light field regulation, which uses a method of displaying different contents in multiple viewing areas and then splicing and reorganizing to expand the display viewing angle. The 2D display screen displays an interlaced coded micro-image array, providing an interlaced light field with different viewing area information. The light field guiding layer performs a light field regulation to guide and separate the outgoing light of the sub-pixels in the interlaced micro-image element to form multiple separated light beams. The light field reconstruction layer performs a secondary light field regulation to reconstruct the separated light beams into separated viewing areas, and then uses them to display continuous 3D information in different separated viewing areas to effectively expand the viewing angle.

Claims

1. A large viewing angle integrated imaging 3D display device based on secondary light field control, characterized in that: The device is composed of a 2D display screen, a light field guiding layer and a light field reconstruction layer. The 2D display screen is located at the bottom layer of the device, and the light field guiding layer and the light field reconstruction layer are located above in sequence. The 2D display screen is used to display an interleaved coded micro-image array, and provide an interleaved light field with different visual area information for the upper structure of the device. The light field guiding layer is a microlens array, which is used to modulate the light emitted by the 2D display screen, and guide and separate the interleaved light fields with different visual area information in space. The light field reconstruction layer is a large lens array, which is composed of a plurality of large lenses with the same parameters, and is used to receive the separated light beams modulated by the light field guiding layer, and perform a second light field regulation on the light emitted by the 2D display screen. The separated light beams in n directions generated by the light field guiding layer are respectively irradiated to n adjacent large lenses, and at the same time, each large lens is subjected to The illumination of the separated light beams refracted by adjacent microlenses; when designing the parameters, ensure is an integer; each large lens refracts and converges the separated light beams to form n adjacent separated viewing areas. By adjusting the 3D content of these n separated viewing areas, the n separated viewing areas can be merged into a complete viewing area; the viewing angle θ of the complete viewing area can be obtained by the formula Calculate, where p d is the sub-pixel width of the 2D display screen, d is the distance between the light field guiding layer and the light field reconstruction layer. The light field guiding layer reconstructs the separated light beams in different directions into separate viewing areas, and merges these separated viewing areas to achieve the expansion of the 3D viewing angle. To ensure that the light field information of different separated viewing areas can be accurately separated and reconstructed, the sub-pixel parameters, light field guiding layer parameters and light field reconstruction layer parameters need to satisfy the formula and Among them, f l and p l is the focal length and pitch of the light field guiding layer, Q L is the pitch of the light field reconstruction layer; the distance d between the light field guiding layer and the light field reconstruction layer is not less than To ensure that the separate light beams irradiating the same large lens can completely overlap.

2. The large viewing angle integrated imaging 3D display device based on secondary light field control according to claim 1, characterized in that: The interleaved coded micro-image array is composed of a plurality of interleaved micro-image elements, each of which is composed of m sub-pixels of a 2D display screen and contains partial light field information in all separated viewing areas.

3. The large viewing angle integrated imaging 3D display device based on secondary light field control according to claim 1, characterized in that: The light field guiding layer is a microlens array, which is located above the 2D display screen and is composed of multiple microlenses with the same parameters. It performs the first light field regulation on the light emitted by the 2D display screen; each microlens modulates n sub-pixels in an interlaced micro-image element it covers, and the light emitted by sub-pixels at different positions in each interlaced micro-image element is refracted by the microlens to generate separated light beams in n directions.

4. The large viewing angle integrated imaging 3D display device based on secondary light field control according to claim 3, characterized in that: The 2D display screen is located at the focal plane below the light field guiding layer to reduce the divergence angle of the separated light beams and avoid crosstalk between adjacent light beams during secondary light field modulation.

5. The large viewing angle integrated imaging 3D display device based on secondary light field control according to claim 3, characterized in that: The number n of sub-pixels modulated by the microlens should be less than 30 to reduce the influence of the edge aberration of the microlens on light modulation, while ensuring that the pitch of the large lens array is not too large to reduce the 3D display effect.

6. The large viewing angle integrated imaging 3D display device based on secondary light field control according to claim 1, characterized in that: The centers of the 2D display screen, the light field guiding layer and the light field reconstruction layer are aligned so that the width of a single separated light beam just illuminates one large lens, ensuring that each large lens will not reconstruct the separated light beam illuminating the adjacent large lens.

Images