Optical structure for large-depth-of-field light field 3D display

Abstract

The utility model relates to the technical field of three-dimensional light field display, aims to solve the technical problem of insufficient depth of field in the current light field 3D display technology, and discloses an optical structure for large-depth-of-field light field 3D display, which comprises a horizontally arranged first light field 3D display and a vertically arranged second light field 3D display, the second light field 3D display is located behind the upper side of the first light field 3D display, the first light field 3D display comprises a first display screen and a first grating parallel to the first display screen, the second light field 3D display comprises a second display screen and a second grating parallel to the second display screen, and a transflective mirror forming a preset included angle with the first grating is arranged. In this way, multi-layer light field reconstruction is formed, the field depth range of 3D content is remarkably expanded, direction regulation and control are conducted on pixel light provided by the two sets of display screens respectively, the light field is reconstructed to the corresponding position in the space through light deflection, the large-field-depth 3D display effect is achieved, and the immersion feeling and visual experience of 3D display are further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of three-dimensional light field display, in particular to an optical structure for large-depth-of-field light field 3D display. Background Technique

[0002] The light field refers to the set of light ray distributions, including information such as the intensity, wavelength, and direction of light rays. Humans can perceive three-dimensional objects in the real world precisely because the eyes receive the light ray distribution information emitted or diffusely reflected from the objects. Based on this principle, the light field display technology has been proposed. This technology usually uses two-dimensional display devices such as liquid crystal displays, LED displays, and projection screens to provide the light ray information required for reconstructing the light field distribution, including the intensity, wavelength, etc. of the light rays. Subsequently, a high-precision light control structure is installed or attached to the screen surface. The light control structure can precisely deflect the light rays emitted by each pixel of the two-dimensional screen and direct them to the corresponding positions in space, endowing the light rays with direction information to form a dense spatial view point, thereby realizing the reconstruction of the object light field distribution and finally presenting a vivid and natural naked-eye 3D effect.

[0003] The light field 3D display technology has broad application prospects in the fields of entertainment, education, medical treatment, industry, and military. However, the current light field 3D display technology still has the problem of insufficient depth of field. The depth of field refers to the depth of the light field 3D display. The larger the depth of field, the stronger the presented three-dimensional sense, thus bringing a stronger visual immersion and impact. Therefore, achieving a large-depth-of-field display effect has always been the pursuit goal of the light field 3D display technology. Usually, the depth of field of the light field 3D display system has a certain range. Beyond this range, the image will appear blurred. The size of the depth of field usually depends on parameters such as the pixel density and grating imaging ability of the light field display system, and the specific depth-of-field performance also varies with different parameter settings.

[0004] However, due to the limitations of the current process, it is difficult to further improve the pixel density of the two-dimensional screen, and the optical imaging ability also faces technical bottlenecks. Therefore, insufficient depth of field has become a common problem in the current 3D display technology. To solve this problem, this patent proposes a solution to improve the depth of field of the light field 3D display. Content of the Utility Model

[0005] The purpose of the utility model is to provide an optical structure for large-depth-of-field light field 3D display to solve the technical problem of insufficient depth of field in the current light field 3D display technology, realize a large-depth-of-field 3D display effect, and further enhance the immersion and visual experience of the 3D display.

[0006] To achieve the above object, the present utility model provides an optical structure for large-depth-of-field light field 3D display. As one of the embodiments: The optical structure includes a horizontally placed first light field 3D display and a vertically placed second light field 3D display. The second light field 3D display is located behind the upper side of the first light field 3D display. The first light field 3D display includes a first display screen and a first grating parallel thereto. The second light field 3D display includes a second display screen and a second grating parallel thereto. A transmissive-reflective mirror is provided at a predetermined angle with the first grating.

[0007] Further, the first grating is attached to the first display screen, the second grating is attached to the second display screen, and the predetermined angle is 45 degrees.

[0008] As another embodiment: The optical structure includes a horizontally placed first light field 3D display and a vertically placed second light field 3D display. The second light field 3D display is located behind the upper side of the first light field 3D display. The first light field 3D display includes a first display screen and a first grating parallel thereto. The second light field 3D display includes a second display screen and a second grating parallel thereto. A cube prism formed by gluing a first prism and a second prism is provided between the first grating and the second grating. A coating is provided on the gluing surface of the first prism and the second prism. The gluing surface forms a 45-degree angle with one grating.

[0009] The optical structure for large-depth-of-field light field 3D display provided by the present utility model has the following advantages:

[0010] The combination of the horizontally placed first display screen and the vertically placed second display screen, with the first grating provided on the first display screen and the second grating provided on the second display screen, forms a multi-level light field reconstruction, significantly expanding the depth-of-field range of the 3D content. The first display screen and the first grating parallel thereto, as well as the second display screen and the second grating parallel thereto, respectively regulate the directions of the pixel light rays provided by the two groups of display screens, and reconstruct the light field to the corresponding positions in space through light deflection. At the same time, a transmissive-reflective mirror provided at a 45-degree angle with the first grating can effectively achieve the reflection and transmission of light, and display the 3D content of the two groups of displays in an overlapping manner without adding additional display devices, thereby significantly enhancing the three-dimensional sense and spatial sense of the overall 3D display. This structure enables the viewer to clearly perceive 3D images at different depth levels within a larger depth-of-field range, enhancing the visual immersion. In addition, by adjusting the positional relationship between the second light field 3D display and the transmissive-reflective mirror, the final depth-of-field effect can be flexibly controlled to provide a more natural and realistic naked-eye 3D experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the optical structure provided by the present utility model;

[0012] Figure 2 Mechanism diagram for enhancing depth of field provided by the present utility model;

[0013] Figure 3 Schematic diagram of double prism gluing provided by the present utility model.

[0014] In the figure: 11, the first display screen; 12, the second display screen; 21, the first grating; 22, the second grating; 30, the transmissive-reflective mirror; 31, the first prism; 32, the second prism; 33, the gluing surface. Specific embodiments

[0015] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0016] Refer to Figure 1 , the present utility model provides an optical structure for large depth of field light field 3D display, including two groups of 2D display screens, namely the first display screen 11 and the second display screen 12, two groups of gratings, namely the first grating 21 and the second grating 22, and a transmissive-reflective mirror 30. The first display screen 11 is placed horizontally, the second display screen 12 is placed vertically, the first grating 21 is parallel to the first display screen 11, and the second grating 22 is parallel to the second display screen 12.

[0017] The 2D display screen is used to load the light field encoded image and provide the pixel ray information required for reconstructing the light field distribution, and can be a liquid crystal display, an LED display, an OLED display, a MicroLED display or a projection screen, etc., which can provide a 2D pixel screen.

[0018] The grating is placed or attached to the surface of the 2D display screen, and can accurately deflect the light emitted by each pixel to the corresponding position in space, endow the light with direction information, form a dense spatial view point, thereby reconstructing the light field distribution of the object and realizing a realistic and natural naked-eye 3D effect.

[0019] The grating can use optical devices such as a cylindrical lens array, a circular lens array, a prism array and a diffraction grating array to realize the deflection of light. In the figure, a cylindrical lens array is taken as an example. The combination of the first display screen 11 and the first grating 21 forms a first light field 3D display, and the combination of the second display screen 12 and the second grating 22 forms a second light field 3D display. This light field 3D display can realize the naked-eye 3D effect. When the viewer views from the front, a part of the 3D image protrudes from the screen, that is, the out-of-screen effect, and the other part recesses into the screen, that is, the in-screen effect. The sum of the out-of-screen distance and the in-screen distance is the depth of field of this display.

[0020] Define the depth of field of the first light field 3D display as h1, and the depth of field of the second light field 3D display as h2. In the present utility model, the first display screen 11 and the second display screen 12 can be different types of display devices, including liquid crystal displays, LED displays, OLED displays, MicroLED displays, or projection screens, etc.; the first grating 21 and the second grating 22 can also be different types of optical structures, such as lenticular lens arrays, circular lens arrays, prism arrays, or diffraction grating arrays. Therefore, the depths of field h1 and h2 of the first light field 3D display and the second light field 3D display can be unequal.

[0021] The transmissive-reflective mirror 30 is an optical device realized through a glass coating process, which can partially transmit and partially reflect light, and its transmission-reflection ratio is variable according to actual application requirements. The most common transmission-reflection ratio is 1:1, that is, a half-transmissive and half-reflective lens. The transmissive-reflective mirror 30 is placed obliquely at an angle of 45 degrees with respect to the first light field 3D display.

[0022] Refer to Figure 2 , the depth of field improvement mechanism of this patent is as follows: The first light field 3D display reconstructs the 3D content 1 within its depth of field. After the light rays emitted from the A image point on the 3D content 1 pass through the transmissive-reflective mirror 30, a part of them is directly transmitted and does not participate in imaging; the other part is reflected into the viewer's eyes. According to the principle of reversibility of light rays, the viewer sees that the image point is behind the transmissive-reflective mirror, and can see the image point through the lens, that is, the B pixel point. Similarly, all the image points of the 3D content 1 can be observed by the viewer after passing through the transmissive-reflective mirror. At the same time, the second light field 3D display also reconstructs the 3D content 2 within its depth of field. Each image point of the 3D content 2 (such as the C image point in the figure) directly enters the viewer's eyes through the transmissive-reflective mirror. Therefore, the viewer can see the 3D content 1 and the 3D content 2 simultaneously. By adjusting the distance W between the second light field 3D display and the transmissive-reflective mirror 30, the total depth of field H of the overall 3D content can be controlled. When H is equal to h1 + h2, the 3D content within the entire depth of field can be clearly presented. Therefore, this solution can achieve the light field 3D display effect with a large depth of field.

[0023] Refer to Figure 3 , the transmissive-reflective mirror 30 can also be replaced by a glued cube prism. By gluing the first prism 31 and the second prism 32 together and coating the glued surface 33, the same effect as the transmissive-reflective mirror 30 in Figure 2 can be achieved.

[0024] An optical structure for large-depth-of-field light field 3D display provided by the present utility model has the following advantages:

[0025] The horizontally placed first display screen is combined with the vertically placed second display screen, and together with the first grating and the second grating, multi-level light field reconstruction is achieved, significantly expanding the depth-of-field range of 3D content. The first grating is parallel to the first display screen, and the second grating is parallel to the second display screen, respectively performing precise direction control on the pixel light rays emitted by the two groups of display screens, and projecting the light field to the corresponding positions in space by means of the deflection of the light rays. At the same time, the beam splitter is arranged at a 45-degree angle relative to the first grating, capable of efficiently performing light reflection and transmission operations, and superimposing and displaying two groups of 3D images without the need to add additional display devices, greatly enhancing the three-dimensional sense and spatial sense of the overall 3D effect. This structure enables the viewer to clearly see 3D images at different depths within a wider depth-of-field range, greatly enhancing the visual immersion. In addition, by adjusting the distance between the second light field display and the beam splitter, the overall depth-of-field effect can be flexibly adjusted, thus bringing a more natural and realistic naked-eye 3D visual experience.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical structure for large depth-of-field light field 3D display, characterized in that, It includes a horizontally placed first light field 3D display and a vertically placed second light field 3D display. The second light field 3D display is located behind the upper side of the first light field 3D display. The first light field 3D display includes a first display screen (11) and a first grating (21) parallel thereto. The second light field 3D display includes a second display screen (12) and a second grating (22) parallel thereto. A transmissive-reflective lens (30) is provided at a predetermined angle with the first grating (21).

2. The optical structure for large depth-of-field light field 3D display according to claim 1, characterized in that The first grating (21) is adhered to the first display screen (11), and the second grating (22) is adhered to the second display screen (12). The predetermined angle is 45 degrees.

3. An optical structure for large-depth-of-field light field 3D display, characterized in that, It includes a horizontally placed first light field 3D display and a vertically placed second light field 3D display. The second light field 3D display is located behind the upper side of the first light field 3D display. The first light field 3D display includes a first display screen (11) and a first grating (21) parallel thereto. The second light field 3D display includes a second display screen (12) and a second grating (22) parallel thereto. A cube prism formed by gluing a first prism (31) and a second prism (32) is provided between the first grating (21) and the second grating (22). A coating is provided on the gluing surface (33) of the first prism (31) and the second prism (32). The gluing surface forms a 45-degree angle with one grating.

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