Device for realizing far-field virtual naked-eye 3D image and generation method

Abstract

The invention discloses an image generation unit and device for realizing a naked eye 3D image, and the image generation unit comprises an LED array light source, a collimating cylindrical lens array, a compound eye cylindrical lens array, an intermediate image diffusion screen, an imaging cylindrical lens array unit, and a liquid crystal panel. Light emitted by the LED array light source sequentially passes through the collimating cylindrical lens array, the compound eye cylindrical lens array, the intermediate image diffusion screen, the imaging cylindrical lens array unit and the liquid crystal panel and then emits polarized light. The device comprises an image generation unit and a virtual image system. According to the image generation unit provided by the invention, the distribution of dense light sources is realized by using the compound eye cylindrical lens array and the middle image diffusion screen, and the technical problem that the size of an optical system is limited and the impression is influenced due to the overlarge size of light valve liquid crystal sub-pixels in a double-liquid-crystal scheme in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of naked-eye 3D display technology, and more specifically, to an image generation unit and device for realizing naked-eye 3D images. Background Art

[0002] With the rapid development of science and technology, there are many reports on the use of 2D virtual images to treat myopia in adolescents. In addition, 3D images and videos have been widely used in children's hospitals as a means of treating amblyopia in children, and the application of naked-eye 3D images to virtual images will achieve twice the result with half the effort in treating and protecting the eyesight of adolescents. Naked-eye 3D technology has emerged as a striking technology, which allows users to watch 3D images or videos with naked eyes without wearing any glasses or equipment. Traditional naked-eye 3D display technology is mainly divided into cylindrical lens type and grating type naked-eye 3D display technology. For traditional cylindrical lens naked-eye 3D display technology, there will be overlap at certain viewing angles, the resolution loss is serious, and it is not compatible with 2D mode. For grating naked-eye 3D display technology, its brightness is low, the resolution loss is serious, and the viewing angle is strict. Therefore, the directional dual liquid crystal structure becomes the best solution.

[0003] As an image generation unit, the dual liquid crystal solution solves the incompatibility problem between 2D and 3D modes. This technology device is thin and light, and can be 3D windowed in 2D mode, and vice versa. At the same time, the resolution is not affected in 2D and 3D modes, and the crosstalk is small. It allows users to return to a more comfortable and natural viewing experience, so it is very popular. However, the dual liquid crystal solution still has many challenges and limitations. For example, the dual liquid crystal solution depends on the resolution and brightness of the light valve liquid crystal. The size of the light valve liquid crystal sub-pixel is too large, which limits the size of the optical system and affects the viewing experience. In addition, the sub-pixels of the light valve liquid crystal are turned on at a fixed point in 3D mode, and the brightness is limited. By continuously increasing the power to increase the brightness, not only the power consumption of the device is increased, but the temperature drift caused by the heat generated during operation cannot be ignored. Summary of the invention

[0004] One of the purposes of the present invention is to provide an image generation unit for realizing naked-eye 3D images, so as to solve the technical problem that in the prior art dual-liquid crystal solution, the size of the light valve liquid crystal sub-pixel is too large, which limits the size of the optical system and affects the viewing experience; the second purpose of the present invention is to provide a device for realizing far-field naked-eye 3D images.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A first aspect of the present invention provides an image generation unit for realizing naked-eye 3D images, comprising an LED array light source, a collimating lenticular lens array, a compound eye lenticular lens array, an intermediate image diffusion screen, an imaging lenticular lens array unit and a liquid crystal panel, wherein the light emitted by the LED array light source sequentially passes through the collimating lenticular lens array, the compound eye lenticular lens array, the intermediate image diffusion screen, the imaging lenticular lens array unit and the liquid crystal panel to emit polarized light.

[0007] In the above technical means, light is emitted from the LED array light source, passes through the collimating lenticular lens array to maximize the light efficiency of the LED, and collimates the light to the compound eye lenticular lens array, which realizes the dense light source distribution, provides light source for the liquid crystal panel, and solves the problem of limited brightness of the liquid crystal light valve. At the same time, the dense distribution solves the problem of too large pixels of the light valve liquid crystal.

[0008] Furthermore, it also includes a linear diffusion film, which is arranged between the imaging lenticular lens array unit and the liquid crystal panel.

[0009] Furthermore, the LED array light source, the collimating lenticular lens array, the compound eye lenticular lens array, the intermediate image diffusion screen, the imaging lenticular lens array unit, the linear diffusion film and the liquid crystal panel are all made of polarization-maintaining materials.

[0010] Furthermore, the LED array light source, the collimating cylindrical lens array and the intermediate image diffusion screen satisfy the following relationship:

[0011] H=N*n

[0012] In the formula, H is the number of viewpoints corresponding to the intermediate image diffusion screen of the collimating cylindrical lens array in each period, N is the number of compound eye units corresponding to the collimating cylindrical lens array in each period, and n is the number of LED array light sources corresponding to the collimating cylindrical lens array in each period. Furthermore, the F number of the image generation unit is greater than 1.653.

[0013] A second aspect of the present invention provides a device for realizing far-field naked-eye 3D images, comprising the above-mentioned image generation unit and virtual image system, wherein the polarized light emitted by the image generation unit is projected to the human eye through the virtual line system.

[0014] Furthermore, the virtual image system includes a semi-transparent and semi-reflective plane mirror, a quarter wave plate and a curved mirror, wherein:

[0015] The plane reflector is coated with a polarization beam splitting film, the polarized light emitted by the image generating unit is reflected by the plane reflector, the polarization direction of the reflected polarized light is consistent with the polarization direction of the polarized light emitted by the image generating unit, and the polarization direction of the light projected by the plane reflector is 90 degrees to the polarization direction of the reflected polarized light, the polarized light is reflected by the 1 / 4 wave plate and the curved reflector, and then passes through the 1 / 4 wave plate again, and enters the human eye through the plane reflector.

[0016] Furthermore, the virtual image system includes a semi-transparent and semi-reflective plane mirror, a quarter wave plate, a curved mirror and a linear polarization film, wherein:

[0017] The polarized light emitted by the image generating unit is reflected by the plane mirror and then passes through the 1 / 4 wave plate. After being reflected by the curved mirror, the reflected light returns along the original path, and is projected onto the semi-transparent and semi-reflective plane mirror after passing through the 1 / 4 wave plate. The transmitted light enters the human eye after passing through the linear polarizing film. The polarization direction of the linear polarizing film is consistent with the polarization direction of the light beam projected onto the semi-transparent and semi-reflective plane mirror after passing through the 1 / 4 wave plate. The optical axis direction of the 1 / 4 wave plate forms an angle of 45 degrees with the polarization direction of the polarized light emitted by the image generating unit.

[0018] Furthermore, the virtual image system includes a semi-transparent and semi-reflective plane reflector and a curved reflector, wherein:

[0019] The plane reflector is coated with a film layer that integrates reflection, transmission and absorption. The absorption ratio is determined according to the size of the ambient light. The polarized light emitted by the image generation unit is reflected by the plane reflector and then incident on the curved reflector, and then reflected back to the plane reflector along the original path, and finally transmitted through the film layer on the plane reflector and incident on the observer's eyes.

[0020] Furthermore, the virtual image system includes a semi-transparent and semi-reflective plane reflector and a curved reflector, wherein:

[0021] The plane reflector is coated with a film layer integrating reflection, transmission, polarization and absorption. The absorption ratio is determined according to the size of the ambient light. The polarized light emitted by the image generation unit is reflected by the plane reflector and then incident on the curved reflector, and then reflected to the plane reflector along the original path, and finally transmitted through the film layer on the plane reflector and incident on the observer's eyes.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0023] The image generation unit provided by the present invention uses a compound eye cylindrical lens array and an intermediate image diffusion screen to achieve the distribution of dense light sources, solving the technical problem that the size of the optical system is limited and the viewing experience is affected by the large size of the light valve liquid crystal sub-pixel in the prior art dual liquid crystal solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of an image generation unit for realizing naked-eye 3D images provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a device for realizing far-field naked-eye 3D images provided by an embodiment of the present invention;

[0026] Figure 3 A schematic structural diagram of a first method for setting up a virtual image system of a device for realizing far-field naked-eye 3D images provided by an embodiment of the present invention;

[0027] Figure 4 A schematic structural diagram of a second method for setting a virtual image system of a device for realizing far-field naked-eye 3D images provided by an embodiment of the present invention;

[0028] Figure 5 A schematic structural diagram of a third method for setting a virtual image system of a device for realizing far-field naked-eye 3D images provided by an embodiment of the present invention;

[0029] Figure 6 A schematic structural diagram of a fourth method for setting up a virtual image system of an apparatus for realizing far-field naked-eye 3D images provided by an embodiment of the present invention.

[0030] In the figure, 1 is an image generating unit, 11 is an LED array light source, 12 is a collimating cylindrical lens array, 13 is a compound eye cylindrical lens array, 14 is an intermediate image diffusion screen, 15 is an imaging cylindrical lens array unit, 16 is a liquid crystal panel, 2 is a virtual image system, 21 is a plane reflector, 22 is a 1 / 4 wave plate, 23 is a curved reflector, 24 is a linear polarizing film, 25 and 26 are left and right eyes of a human eye, 27 is a human eye, and 28 is a film layer. DETAILED DESCRIPTION

[0031] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0032] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0033] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] Example 1

[0036] This embodiment provides an image generation unit 1 for realizing naked eye 3D images, such as Figure 1 and Figure 2 As shown, it includes an LED array light source 11, a collimating lenticular lens array 12, a fly-eye lenticular lens array 13, an intermediate image diffusion screen 14, an imaging lenticular lens array unit 15 and a liquid crystal panel 16, wherein the light emitted by the LED array light source 11 passes through the collimating lenticular lens array 12, the fly-eye lenticular lens array 13, the intermediate image diffusion screen 14, the imaging lenticular lens array unit 15 and the liquid crystal panel 16 in sequence and then emits polarized light.

[0037] In a further embodiment, a linear diffusion film is further included, and the linear diffusion film is arranged between the imaging lenticular lens array unit and the liquid crystal panel.

[0038] In a further embodiment, the LED array light source 11, the collimating lenticular lens array 12, the fly-eye lenticular lens array 13, the intermediate image diffusion screen 14, the imaging lenticular lens array unit 15, the linear diffusion film and the liquid crystal panel 16 are all made of polarization-maintaining materials.

[0039] In a further embodiment, the LED array light source 11, the collimating cylindrical lens array 12 and the intermediate image diffusion screen 14 satisfy the following relationship:

[0040] H=N*n

[0041] Wherein, H is the number of viewpoints of the collimating cylindrical lens array 12 corresponding to the intermediate image diffusion screen 14 in each period, N is the number of compound eye units corresponding to the collimating cylindrical lens array 12 in each period, and n is the number of LED array light sources 11 corresponding to the collimating cylindrical lens array 12 in each period. Within the range allowed by the process, increasing the number of N can extend the light source to the diffusion screen of the intermediate image and realize the distribution of dense light sources.

[0042] The above-mentioned dense light source distribution expands the angle of emission after passing through the intermediate image diffusion screen 14, making the screen look more uniform, and at the same time replaces the function of the light valve liquid crystal, providing a light source for the liquid crystal panel 16, solving the problem of limited brightness of the liquid crystal light valve. At the same time, the dense distribution solves the problem of too large pixels of the light valve liquid crystal.

[0043] The position of the intermediate image diffuser 14 is used as an extended light source, and coincides with the spot where the light is traced back from the virtual image seen by the observer at the human eye through the reflector with transmission function, the curved reflector and the imaging cylindrical lens array unit. The light-on width of the liquid crystal panel 16 is traced back to the position of the intermediate image diffuser 14 according to the spot width required by the human eye at the viewing distance, and the corresponding area of ​​the LED light source array 11 is lit accordingly.

[0044] The position and range of the 3D virtual image can always be seen by the observer's eyes, collectively referred to as the 3D virtual image human eye box. When the line of sight moves within the eye box, the light-on position of the LED array light source will be adjusted in real time according to the change of the line of sight position. The dense distribution of the intermediate image expansion light source can also ensure that the light-on viewpoint is continuous during the change of the line of sight position, without obvious flickering.

[0045] The viewing image is formed in the visible area through the liquid crystal panel 16, and the naked eye parallax 3D display is achieved by the LED array light source 11 and the liquid crystal panel 16 changing alternately at a high rate to achieve the left and right viewpoint naked eye 3D effect. The observer can watch the naked eye 3D virtual image in the eye box.

[0046] In a further embodiment, the F number of the image generating unit 1 is greater than 1.653, which can ensure stable optical performance from room temperature to 75 degrees, and offset the influence of temperature drift on the imaging quality of the optical system after the heat generated during the operation of the LED array light source 11 and the image liquid crystal is offset.

[0047] In a further embodiment, the surface types of the collimating lenticular lens array 12, the compound eye lenticular lens array 13 and the imaging lenticular lens array unit 15 include but are not limited to a spherical lenticular lens array, an aspherical lenticular lens array, and a structural combination of replacing the lenticular lens array with a Fresnel array.

[0048] In a further embodiment, the imaging lenticular lens array unit 15 includes but is not limited to a grating array. The form of the compound eye lenticular lens array 13 includes but is not limited to the front and rear surfaces being a lenticular lens structure; the front surface being a lenticular lens structure and the rear surface being a plane; the front surface being a lenticular lens structure and the rear surface being a lenticular lens structure. The above-mentioned image generation unit 1 can be used alone as an optical system to generate the function of naked eye 3D.

[0049] In a further embodiment, the image generation unit 1 can be used alone as an optical system to generate naked eye 3D functions. The image generation unit 1 can match any virtual image system, and the virtual image system 2 is not limited to the surface structure of a reflector with a transmission function and a free-form reflector.

[0050] Example 2

[0051] This embodiment provides a device for realizing far-field naked-eye 3D images, such as Figure 2 As shown, it includes the image generation unit 1 and the virtual image system 2 described in Example 1, wherein the polarized light emitted by the image generation unit 1 is projected to the human eye through the virtual image system 2.

[0052] Example 3

[0053] The present invention further describes the virtual image system 2 in embodiment 2. In a general virtual image system, Figure 2As shown, the light starts from the image generation unit 1, passes through the plane reflector 21, 1 / 4 wave plate 22, and curved reflector 23 of the virtual image system 2, returns along the original path to the 1 / 4 wave plate 22, the plane reflector 21, and enters the left and right eyes 25 and 26 of the observer. Figure 2 The dashed and solid lines in the figure also represent the direction of the light entering the left and right eyes. At the same time, ambient light will enter the system through the plane reflector 21. Simply using a semi-transparent and semi-reflective plane reflector 21 and a curved reflector 23 as a module for generating virtual images will cause the virtual image and ambient light to enter the observer's eyes 25 and 26 at the same time, causing a decrease in clarity and seriously affecting the viewing experience. The following four solutions are proposed to eliminate the interference factor of ambient light.

[0054] In the first virtual image system setting, Figure 3 As shown, the virtual image system includes a semi-transparent and semi-reflective plane mirror 21, a quarter wave plate 22 and a curved mirror 23, wherein:

[0055] The plane reflector 21 is coated with a polarization beam splitting film. The polarized light emitted by the image generating unit 1 is reflected by the plane reflector 21. The polarization direction of the reflected polarized light is consistent with the polarization direction of the polarized light emitted by the image generating unit 1, and the polarization direction of the light projected by the plane reflector 21 is 90 degrees to the polarization direction of the reflected polarized light. After the polarized light is reflected by the 1 / 4 wave plate 22 and the curved reflector 23, it passes through the 1 / 4 wave plate 22 again and enters the human eye through the plane reflector 21.

[0056] In a specific embodiment, in the virtual image system 2, after the polarized light is emitted from the image generating unit 1, the polarization direction of the light is as follows: Figure 3 As shown, the light is emitted and passes through the plane reflector 21 in sequence along the optical axis direction, wherein the reflective surface of the plane reflector 21 is coated with a polarization beam splitter film in the visible light range, and the direction of the polarized light reflected by the polarization beam splitter film is consistent with the polarization direction of the directional light beam emitted by the image generating unit 1, which makes the polarized light emitted by the image generating unit 1 completely pass through the plane reflector 21 coated with the polarization beam splitter film, and the polarization direction of the transmission part of the polarization beam splitter film and the polarization direction of the reflection are distributed at 90 degrees. Figure 3As shown, the polarized light passing through the reflector 21 passes through the 1 / 4 wave plate 22, wherein the optical axis of the 1 / 4 wave plate 22 and the polarization direction of the directional light beam form an angle of 45 degrees. After the linearly polarized light passes through the 1 / 4 wave plate 22, the linearly polarized light is converted into circularly polarized light. After passing through the curved reflector 23, the circularly polarized light realizes a mirror image once, and the polarized light passing through the 1 / 4 wave plate 22 twice is distributed at 90 degrees. Therefore, after returning along the original path and passing through the 1 / 4 wave plate 22, the linearly polarized light emitted by the 1 / 4 wave plate 22 is distributed at 90 degrees with the incident linear polarized light. After the linearly polarized light rotated 90 degrees is incident on the plane reflector 21 coated with a polarization beam splitting film, the transmission condition of polarization beam splitting is met, so the light passes through the plane reflector 21 and enters the human eye. In the entire refraction and reflection process, it depends on the transmittance of the polarization beam splitting film, which can theoretically reach 100%.

[0057] In the above process, the environment enters and exits the human eye and is incident on the plane reflector 21 coated with a polarization beam splitter film. The linearly polarized light in the ambient light that meets the transmission direction of the beam splitter film can enter the virtual image system 2. According to the above propagation direction, after passing through the 1 / 4 wave plate 22 twice, the linear polarized light that originally entered the virtual image system 2 is rotated 90 degrees. When passing through the plane reflector 21 coated with a polarization beam splitter film again, it meets the reflection condition of the polarization beam splitter film. Therefore, the ambient light entering the virtual image system 2 cannot be projected to the human eye, solving the problem of the human eye seeing the ambient light.

[0058] In the second virtual image system setting, Figure 4 As shown, the virtual image system includes a semi-transparent and semi-reflective plane mirror 21, a quarter wave plate 22, a curved mirror 23 and a linear polarization film 24, wherein:

[0059] The polarized light emitted by the image generating unit 1 is reflected by the plane reflector 21 and passes through the 1 / 4 wave plate 22. After being reflected by the curved reflector 23, the reflected light returns along the original path, and is projected onto the semi-transparent and semi-reflective plane reflector 21 after passing through the 1 / 4 wave plate 23. The transmitted light enters the human eye after passing through the linear polarizing film 24. The polarization direction of the linear polarizing film 24 is consistent with the polarization direction of the light beam projected onto the semi-transparent and semi-reflective plane reflector 21 after passing through the 1 / 4 wave plate 22. The optical axis direction of the 1 / 4 wave plate 22 forms an angle of 45 degrees with the polarization direction of the polarized light emitted by the image generating unit 1.

[0060] In a specific embodiment, in the virtual image system 2, the directional light beam passes through the semi-transparent and semi-reflective plane mirror 21 from the image generation unit 1 along the optical axis direction to reach the 1 / 4 wave plate 22, and after being reflected by the curved mirror 23, the reflected light returns along the original path, and after passing through the 1 / 4 wave plate 22, it is projected onto the semi-transparent and semi-reflective plane mirror 21, wherein a linear polarization film 24 is placed between the semi-transparent and semi-reflective mirror 21 and the human eye box, and the linear polarization film 24 is closely attached to the plane mirror 21, and the polarization direction of the linear polarization film 24 is consistent with the polarization direction projected onto the semi-transparent and semi-reflective plane mirror 21 after passing through the 1 / 4 wave plate 22. The optical axis direction of the 1 / 4 wave plate 22 forms an angle of 45 degrees with the polarization direction of the directional light beam emitted by the image generation unit 1. Due to the need to pass through the semi-transparent and semi-reflective film layer, the light effect incident on the human eye in this scheme is less than that of the first generation scheme.

[0061] In the above process, the environment enters and exits the human eye and is incident on the linear polarization film 24. The linearly polarized light in the ambient light that meets the transmission direction of the linear polarization film 24 can enter the virtual image system 2. According to the above propagation direction, after passing through the 1 / 4 wave plate 22 twice, the linear polarized light originally entering the virtual image system 2 is rotated 90 degrees. When passing through the linear polarization film 24 again, it no longer meets the transmission condition. Therefore, the ambient light entering the virtual image system 2 cannot be projected to the human eye, solving the problem of the human eye seeing the ambient light.

[0062] In the third virtual image system setting, Figure 5 As shown, the virtual image system includes a semi-transparent and semi-reflective plane reflector 21 and a curved reflector 23, wherein:

[0063] The front and back surfaces of the plane reflector 21 are coated with reflective, transmissive and absorbing films 28. The film layer 28 close to the human eye is used to absorb the environment, and the absorption ratio is determined according to the size of the ambient light. The reflective film layer 28 is used to reflect the polarized light emitted by the image generation unit 1. After being reflected by the plane reflector 21, it enters the curved reflector 23, reflects back to the plane reflector 21, and finally transmits through the film layer 28 on the plane reflector 21 and enters the observer's human eye.

[0064] In a specific embodiment, in the virtual image system 2, a directional light beam is projected from the image generation unit 1 along the optical axis direction onto a plane reflector 21 coated with a film layer of reflection 28, transmission, and absorption 24. The purpose of the absorption is to filter out the interference of ambient light, so the absorption ratio depends on the size of the ambient light. After passing through the plane reflector 21, the light is incident on the curved reflector 23 and then reflected back to the plane reflector 21. This system does not require the addition of a 1 / 4 wave plate. It passes through the transmissive film layer on the plane reflector 21 and is incident on the observer's eye 27. The observer can view the virtual image of the large-screen naked-eye 3D at a certain distance. This generation scheme reduces the 1 / 4 wave plate 22, so the cost is lower, but due to the addition of an absorption film system on the plane reflector 21, the light efficiency is also less than the second scheme.

[0065] In the fourth virtual image system setting, Figure 6 As shown, the virtual image system includes a semi-transparent and semi-reflective plane reflector 21 and a curved reflector 23, wherein:

[0066] The plane reflector 21 is coated with a film layer 28 for reflection, transmission, polarization and absorption, and the absorption ratio is determined according to the size of the ambient light. The polarized light emitted by the image generation unit 1 is reflected by the plane reflector 21 and then incident on the curved reflector 23, reflected to the plane reflector 21 along the original path, and finally transmitted through the film layer on the plane reflector 21. The front and back surfaces of 21 are coated with film layers. The film layer 28 is used for reflection and polarization, and the film layer 24 is used for absorbing ambient light and then incident the light beam on the observer's eyes.

[0067] In a specific embodiment, a directional light beam is projected from the image generating unit 1 along the optical axis direction onto a plane reflector 21 coated with reflective, transmissive, polarizing and absorbing film layers. The purpose of polarization and absorption is to filter out the interference of ambient light, so the absorption ratio depends on the size of the ambient light. Compared with the third scheme, this scheme can reduce the absorption coefficient of the plane reflector 21, thereby having a greater absorption of ambient non-polarized light and a smaller absorption of screen polarized light. After being reflected by a plane, the light is incident on a curved reflector and then reflected to a plane reflector 21, passing through the transmissive film layer on the plane reflector 21 and incident on the observer's eyes. The observer can view a large-screen naked-eye 3D virtual image at a certain distance.

[0068] Solve the interference of ambient light, and combine it with Figure 2 , explain how the image generation unit 1 and the virtual image system 2 are coordinated.

[0069] like Figure 2As shown, the LED array light source 11, collimating lenticular lens array 12, compound eye lenticular lens array 13, intermediate image diffusion screen 14, and imaging lenticular lens array unit 15 are sequentially arranged along the optical axis direction, and projected onto the linear diffusion film and liquid crystal panel 16, wherein the position of the intermediate image diffusion screen 14 is used as an extended light source, and the light spot landing point coincides with the light spot after the virtual image seen by the observer at the human eye is traced back through the plane reflector 21, 1 / 4 wave plate 22, curved reflector 23, and imaging lenticular lens array 15 units. The light-on width of the liquid crystal panel 16 is traced back to the position of the intermediate image diffusion screen 14 according to the light spot width required by the human eye at the viewing distance, and the corresponding area of ​​the LED light source array 11 is correspondingly lit.

[0070] The position and range of the 3D virtual image can always be seen at the observer's human eye 27, collectively referred to as the 3D virtual image human eye box 27. When the line of sight moves within the eye box range, the light-on position of the LED array light source will be adjusted in real time according to the change of the line of sight position. The dense distribution of the intermediate image expansion light source 14 can also ensure that the light-on viewpoint is continuous during the change of the line of sight position, and there is no obvious flickering feeling between the left and right eyes 25 and 26.

[0071] A viewing image is formed in the visible area through the liquid crystal panel 16 , and the naked-eye parallax 3D display is achieved by alternating the left and right viewpoints 25 and 26 of the LED array light source 111 and the liquid crystal panel 16 at a high rate to achieve the naked-eye 3D effect. The observer can watch the naked-eye 3D virtual image in the eye box 27 .

[0072] The same or similar reference numerals correspond to the same or similar components;

[0073] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An image generation unit for realizing naked eye 3D images, characterized in that: It includes an LED array light source, a collimating lenticular lens array, a compound eye lenticular lens array, an intermediate image diffusion screen, an imaging lenticular lens array unit and a liquid crystal panel, wherein the light emitted by the LED array light source sequentially passes through the collimating lenticular lens array, the compound eye lenticular lens array, the intermediate image diffusion screen, the imaging lenticular lens array unit and the liquid crystal panel to emit polarized light.

2. The image generation unit for realizing naked eye 3D images according to claim 1, characterized in that: The invention also comprises a linear diffusion film, wherein the linear diffusion film is arranged between the imaging lenticular lens array unit and the liquid crystal panel.

3. The image generation unit for realizing naked eye 3D images according to claim 2, characterized in that: The LED array light source, collimating lenticular lens array, compound eye lenticular lens array, intermediate image diffusion screen, imaging lenticular lens array unit, linear diffusion film and liquid crystal panel are all made of polarization-maintaining materials.

4. The image generation unit for realizing naked eye 3D images according to claim 1, characterized in that: The LED array light source, collimating cylindrical lens array and intermediate image diffusion screen satisfy the following relationship: H=N*n Wherein, H is the number of viewpoints corresponding to the intermediate image diffusion screen in each period of the collimating lenticular lens array, N is the number of compound eye units corresponding to the collimating lenticular lens array in each period, and n is the number of LED array light sources corresponding to the collimating lenticular lens array in each period.

5. The image generation unit for realizing naked eye 3D images according to any one of claims 1 to 4, characterized in that: The F number of the image generating unit is greater than 1.

653.

6. A device for realizing far-field naked-eye 3D images, characterized in that: It comprises the image generating unit and virtual image system as described in any one of claims 1 to 5, wherein the polarized light emitted by the image generating unit is projected to the human eye through the virtual line system.

7. The device for realizing far-field naked-eye 3D images according to claim 6, characterized in that: The virtual image system includes a semi-transparent and semi-reflective plane mirror, a quarter wave plate and a curved mirror, wherein: The plane reflector is coated with a polarization beam splitting film, the polarized light emitted by the image generating unit is reflected by the plane reflector, the polarization direction of the reflected polarized light is consistent with the polarization direction of the polarized light emitted by the image generating unit, and the polarization direction of the light projected by the plane reflector is 90 degrees to the polarization direction of the reflected polarized light, the polarized light is reflected by the 1 / 4 wave plate and the curved reflector, and then passes through the 1 / 4 wave plate again, and enters the human eye through the plane reflector.

8. The device for realizing far-field naked-eye 3D images according to claim 6, characterized in that: The virtual image system includes a semi-transparent and semi-reflective plane mirror, a quarter wave plate, a curved mirror and a linear polarization film, wherein: The polarized light emitted by the image generating unit is reflected by the plane mirror and then passes through the 1 / 4 wave plate. After being reflected by the curved mirror, the reflected light returns along the original path, and is projected onto the semi-transparent and semi-reflective plane mirror after passing through the 1 / 4 wave plate. The transmitted light enters the human eye after passing through the linear polarizing film. The polarization direction of the linear polarizing film is consistent with the polarization direction of the light beam projected onto the semi-transparent and semi-reflective plane mirror after passing through the 1 / 4 wave plate. The optical axis direction of the 1 / 4 wave plate forms an angle of 45 degrees with the polarization direction of the polarized light emitted by the image generating unit.

9. The device for realizing far-field naked-eye 3D images according to claim 6, characterized in that: The virtual image system includes a semi-transparent and semi-reflective plane reflector and a curved reflector, wherein: The plane reflector is coated with a film layer that integrates reflection, transmission and absorption. The absorption ratio is determined according to the size of the ambient light. The polarized light emitted by the image generation unit is reflected by the plane reflector and then incident on the curved reflector, and then reflected back to the plane reflector along the original path, and finally transmitted through the film layer on the plane reflector and incident on the observer's eyes.

10. The device for realizing far-field naked-eye 3D images according to claim 6, characterized in that: The virtual image system includes a semi-transparent and semi-reflective plane reflector and a curved reflector, wherein: The plane reflector is coated with a film layer integrating reflection, transmission, polarization and absorption. The absorption ratio is determined according to the size of the ambient light. The polarized light emitted by the image generation unit is reflected by the plane reflector and then incident on the curved reflector, and then reflected to the plane reflector along the original path, and finally transmitted through the film layer on the plane reflector and incident on the observer's eyes.

Images