Large-viewing-angle integrated imaging 3D display device

Abstract

The invention provides a large-viewing-angle integrated imaging 3D display device. The device is composed of a 2D display screen, a symmetrical composite lens array and an optical diffusion screen. And the 2D display screen is used for presenting an integrated imaging 3D image source, namely an image array. And the symmetrical compound lens array is used for refracting light rays emitted by the 2D display screen, so that the light rays are converged in the space, and a 3D image is reproduced. And the optical diffusion screen is used for scattering light emitted by the reproduced 3D image at a specific angle, so that the discrete 3D image is smooth and continuous. According to the integrated imaging 3D display device, the lens array is designed by adopting a symmetrical structure, the distance between the lens array and the 2D display screen can be shortened while the large pitch is achieved, and the viewing angle of the integrated imaging 3D display device is improved.

Description

1. Technical Field

[0001] The present invention relates to the field of 3D display technology, and more specifically, to a large-viewing-angle integrated imaging 3D display device. 2. Background Technology

[0002] With the development of display technology, integrated imaging 3D display technology has attracted more and more attention. Integrated imaging 3D display has the advantages of full parallax, quasi-continuous viewing viewpoint, full color display, etc., so it is considered to be one of the 3D display technologies with development prospects. The performance parameters of integrated imaging 3D display devices include 3D image viewing angle, depth and resolution. There is a mutually restrictive relationship between them. At present, these three parameters are still limited. Viewing angle is one of the main indicators for evaluating the viewing performance of integrated imaging 3D display devices. In order to improve the viewing angle of integrated imaging 3D display devices, domestic and foreign researchers have carried out a series of research work. For example, time multiplexing or space multiplexing technology, mobile lens array technology and perspective stitching technology have been proposed to increase the viewing angle, but these technologies have problems such as high complexity and difficulty in implementation. III. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention proposes a large-viewing-angle integrated imaging 3D display device, which is composed of a 2D display screen, a symmetrical composite lens array and an optical diffusion screen.

[0004] The 2D display screen is used to present integrated imaging 3D image sources, namely, image arrays.

[0005] The symmetrical composite lens array is used to refract the light emitted by the 2D display screen so as to converge the light in space and reproduce a 3D image.

[0006] The optical diffusion screen is used to scatter the light emitted by the reproduced 3D image at a specific angle, so as to make the discrete 3D image smooth and continuous.

[0007] Furthermore, the symmetrical composite lens array is composed of lens groups with symmetrical structures arranged at equal intervals in the horizontal and vertical directions. The symmetrical composite lens array is composed of m×n lens groups, m is the number of lens groups in the horizontal direction, and n is the number of lens groups in the vertical direction. Each lens group is aligned with the center of the image element of the image array, and the lens group and the image element have the same size.

[0008] Furthermore, the lens group of the symmetrical structure is composed of lenses with large aperture and short focal length, each lens group includes two lenses, the structures and materials of the two lenses are completely the same, the lenses and the aperture are arranged in a symmetrical structure, that is, in the order of "lens-aperture-lens", the aperture is located at the center of the lens group, and the front and rear lenses are symmetrical about the aperture axis. The focal length f of the lens group is expressed as

[0009]

[0010] Where f' is the focal length of the single lens, and d is the distance between the optical centers of the two lenses.

[0011] Preferably, the distance d between the optical centers of the two lenses satisfies 0<d<f', so that f<f'.

[0012] Preferably, the distance g from the object principal plane of the lens array to the 2D display screen satisfies:

[0013] f<g<2f (2)

[0014] Preferably, the distance g from the object principal plane of the lens array to the 2D display screen satisfies: g≤f'.

[0015] Furthermore, the diffusion angles of the optical diffusion screen in the horizontal direction and the vertical direction are the same.

[0016] Furthermore, the object-image relationship between the 2D display screen, the optical diffusion screen and the symmetrical compound lens array satisfies the Gaussian imaging formula. The centers of the 2D display screen, the symmetrical compound lens array and the optical diffusion screen are collinear.

[0017] A large viewing angle integrated imaging 3D display device provided by the present invention adopts a symmetrical structure to design a symmetrical composite lens group, and arranges the symmetrical composite lens group at equal intervals in the horizontal and vertical directions to form a symmetrical composite lens array. The symmetrical composite lens array has a large pitch while shortening the distance between the lens array and the 2D display screen, thereby improving the viewing angle of the integrated imaging 3D display device. IV. Description of the drawings

[0018] The above aspects and advantages of the present invention will be further clarified and easily understood from the following detailed description in conjunction with the accompanying drawings and embodiments, in which:

[0019] Attached Figure 1 The figure is a schematic diagram of the structure of a 3D display device with large viewing angle and integrated imaging.

[0020] Attached Figure 2 (a) is a schematic diagram of the viewing angle of an integrated imaging 3D display device based on a symmetrical composite lens array.

[0021] Attached Figure 2 (b) is a schematic diagram of the viewing angle of an integrated imaging 3D display device based on a traditional single-chip lens array.

[0022] Attached Figure 3 The schematic diagram of a 3D display device with large viewing angle and integrated imaging.

[0023] The graphic symbols of the above-mentioned drawings are:

[0024] 1 2D display screen, 2 symmetrical compound lens array, 3 optical diffusion screen, 4 reproduced 3D image, 5 monolithic lens array.

[0025] It should be understood that the above drawings are only schematic and are not drawn to scale. V. Specific implementation methods

[0026] The following is a detailed description of an embodiment of a large viewing angle integrated imaging 3D display device proposed by the present invention, and further describes the present invention. 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. Persons skilled in the art in this field may make some non-essential improvements and adjustments to the present invention based on the above invention content, which still fall within the scope of protection of the present invention.

[0027] The embodiment of the present invention provides a large viewing angle integrated imaging 3D display device, which is composed of a 2D display screen, a symmetrical composite lens array and an optical diffusion screen. Figure 1 The 2D display screen is used to present the integrated imaging 3D image source, that is, the image array. The light emitted by the 2D display screen passes through the symmetrical composite lens array, and according to the principle of reversible light path, it converges in space to reproduce discrete 3D images, and then diffuses to a specific angle through the optical diffusion screen to reproduce continuous 3D images.

[0028] The 2D display screen is used to present an integrated imaging 3D image source, that is, an image array. In one embodiment, the 2D display screen is a liquid crystal display screen, and the integrated imaging 3D image source is composed of 10×5 image elements, and the image element size is 11.46 mm.

[0029] The symmetrical composite lens array is used to refract the light emitted by the 2D display screen so as to converge the light in space and reproduce a 3D image.

[0030] The optical diffuser screen is used to scatter the light emitted by the reproduced 3D image at a specific angle, so that the discrete 3D image becomes smooth and continuous. In one embodiment, the diffusion angle of the optical diffuser screen in the horizontal direction and the vertical direction is 20°.

[0031] Specifically, the symmetrical compound lens array is composed of symmetrical compound lens groups with symmetrical structures arranged at equal intervals in the horizontal and vertical directions. In one embodiment, the symmetrical compound lens array is composed of 10×5 symmetrical compound lens groups, the pitch of the symmetrical compound lens array is 11.46 mm, each symmetrical compound lens group is aligned with the center of the image element of the image array, and the symmetrical compound lens group has the same size as the image element.

[0032] Specifically, the lens group of the symmetrical structure is composed of lenses with large aperture and short focal length. Each lens group contains two lenses. The structures and materials of the two lenses are exactly the same. The lenses and the aperture are arranged in a symmetrical structure, that is, in the order of "lens-aperture-lens". The aperture is located at the center of the lens group, and the front and rear lenses are symmetrical about the aperture axis. The focal length f of the lens group is expressed as

[0033]

[0034] Wherein f' is the focal length of the lens, and d is the distance between the optical centers of the two lenses. In one embodiment, both lenses are plano-convex lenses, made of K9 glass with a refractive index of 1.51630, with a focal length of f'=15 mm and a lens aperture of 10 mm. The two lenses are close together with their convex surfaces facing each other. The distance d between the optical centers can be ignored, that is, d≈0. The distance d between the optical centers of the two lenses satisfies 0<d<f', and the focal length of the combined symmetrical composite lens group is f=7.5 mm. The object distance g=8.5 mm from the object principal plane of the lens array to the 2D display screen, satisfies f<g<2f and g≤f', and the viewing angle of 3D image θ=67.9°, as shown in the attached figure. Figure 2 (a) shows an integrated imaging 3D display device using a conventional single-chip lens array, with a 3D image viewing angle of θ' = 39.4°. Figure 2 (b) as shown.

[0035] The object-image relationship between the 2D display screen, the optical diffusion screen and the symmetrical composite lens array in the embodiment of the present invention satisfies the Gaussian imaging formula, as shown in the attached figure. Figure 3 The centers of the 2D display screen, the symmetrical composite lens array and the optical diffusion screen are collinear.

[0036] A large viewing angle integrated imaging 3D display device proposed by the present invention adopts a symmetrical structure to design a symmetrical composite lens group, and arranges the symmetrical composite lens group at equal intervals in the horizontal and vertical directions to form a symmetrical composite lens array. The symmetrical composite lens array has a large lens element pitch while shortening the distance between the lens array and the 2D display screen, thereby improving the viewing angle of the integrated imaging 3D display device.

Claims

1. A large viewing angle integrated imaging 3D display device, characterized in that: The device comprises a 2D display screen, a symmetrical composite lens array and an optical diffusion screen.

2. A large viewing angle integrated imaging 3D display device according to claim 1, characterized in that: The symmetrical composite lens array is composed of lens groups with symmetrical structures arranged at equal intervals in the horizontal and vertical directions. The symmetrical composite lens array is composed of m×n lens groups, where m is the number of lens groups in the horizontal direction and n is the number of lens groups in the vertical direction.

3. A large viewing angle integrated imaging 3D display device according to claim 1 or 2, characterized in that: The lens group with a symmetrical structure is composed of lenses with large aperture and short focal length. Each lens group contains two lenses. The structures and materials of the two lenses are exactly the same. The lenses and the aperture are arranged in a symmetrical structure, that is, in the order of "lens-aperture-lens". The aperture is located at the center of the lens group, and the front and rear lenses are symmetrical about the aperture axis. The focal length of the lens group is f, the focal length of the single lens is f', and the distance between the optical centers of the two lenses is d.

4. The large viewing angle integrated imaging 3D display device according to claim 1, characterized in that: The distance g from the object principal plane of the symmetrical composite lens array to the 2D display screen satisfies: f<g<2f.

5. The large viewing angle integrated imaging 3D display device according to claim 1, characterized in that: The distance g from the object principal plane of the symmetrical composite lens array to the 2D display screen satisfies: g≤f'.

6. The large viewing angle integrated imaging 3D display device according to claim 1, characterized in that: The object-image relationship among the 2D display screen, the optical diffusion screen and the symmetrical composite lens array satisfies the Gaussian imaging formula, and the centers of the 2D display screen, the symmetrical composite lens array and the optical diffusion screen are collinear.

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