2d / 3d / light field full compatible virtual imaging display system

Abstract

The application provides a 2D / 3D / light field full compatible virtual imaging display system, relates to the technical field of display imaging, and comprises an eye tracking module, an eye tracking module, an effective viewing space area box, an optical module, an image control module and an image generation module. Display pictures are projected to eyes at a long distance through a reflection type free curved field mirror and a reflection type free curved distortion compensation mirror, so that an observer can watch without approaching a virtual display. The image control module converts image data into a light field 3D image, a parallax 3D image or a plane image according to a selected watching mode of a user, and synchronously sends an eye position signal to the image generation module to form a light field, a 3D and a plane display source. The observer can watch the free switching of three modes of a full parallax light field mode, a naked eye parallax 3D mode and a common plane display mode, so as to adapt to the watching requirements of different scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display imaging, and more particularly to a 2D / 3D / light field full compatible virtual imaging display system. BACKGROUND

[0002] Display industry is one of the cornerstones of China's electronic information industry. In the past few decades, display technology has developed from the initial signal indicator to seven-segment display tube, from cathode ray tube (CRT) display to large-size light-emitting diode (LED) today. At the same time, ultra-thin, curved, flexible and other display technologies have gradually become the development direction of display technology. However, these displays all belong to physical display, that is, a display carrier such as LCD panel, OLED panel, etc. is needed. The disadvantage of such physical display is that if a huge picture experience is wanted, a huge display carrier is needed, such as a 100-inch display for watching a 100-inch picture, which is costly. Although a projector can provide a huge display picture at a low price through projection, it still needs a projection screen carrier, which reduces its convenience. Therefore, a carrier-free virtual display emerges as the times require, which can provide a huge display picture at a very small cost and equipment.

[0003] A virtual display is a type of display that uses its optical system to view images. Augmented reality (AR), virtual reality (VR), and head-mounted displays are all types of virtual displays. Viewing images on a virtual display differs from how we typically view displays like LCDs. With conventional displays, images can be seen using normal viewing methods; however, when viewing a virtual display, one must observe it from a close distance using an inward-looking posture, which limits the development of virtual displays. Existing technology discloses a device that displays independent and different images to eyes at different positions using the same screen (lens), including multiple projectors, a converging lens (convex lens or Fresnel lens), and a reflector. The projectors include multiple projectors placed outside the focal length of the lens. The parameters of the lens and the projector can be adjusted according to different viewing positions and interpupillary distances, so that the light emitted by each projector array converges near the viewer's eyes, achieving independent viewing of the images projected by each projector in the projector array. This enables high-definition, high-brightness, ultra-low power consumption projection display and allows switching between two-dimensional and three-dimensional display modes. Although the prior art disclosed in this application can achieve switching between two-dimensional and three-dimensional display modes, on the one hand, the use of projectors requires a projection screen or other carrier, which reduces its convenience; on the other hand, it is difficult to control the degree of parallax pattern overlap between each projector; and on the other hand, the human eye needs to be in a fixed and specific position to view. If multiple viewpoints are to be generated, many projectors are required, which is very limiting. The lens is very thick, and the focal length is generally very long, with a thickness of about meters. In addition, the imaging quality of the center of a single lens is relatively good, but the imaging quality at the edge will be very poor, that is, the viewing area will be very small. Summary of the Invention

[0004] To address the problem that traditional virtual displays require close-range viewing and cannot adapt to different viewing scenarios, this invention proposes a 2D / 3D / light field fully compatible virtual imaging display system. This system projects the display image onto the viewer's eyes from a distance, allowing the observer to view it without needing to get close to the virtual display. It also enables the observer to freely switch between three modes: full parallax light field mode, naked-eye parallax 3D mode, and ordinary flat display mode, to adapt to different viewing scenarios.

[0005] To achieve the above-mentioned technical effects, the technical solution of the present invention is as follows:

[0006] A 2D / 3D / light field fully compatible virtual imaging display system includes: an eye-tracking module, an effective viewing space area box, an optical module composed of a reflective freeform surface field mirror and a reflective freeform surface distortion compensation mirror, an image control module, and an image generation module. The reflective freeform surface field mirror is the direct viewing medium for the human eye, and the reflective freeform surface distortion compensation mirror compensates for the aberrations displayed by the reflective freeform surface field mirror. The eye-tracking module is located above the reflective freeform surface field mirror and tracks the position of the human eye's pupil located in the effective viewing space area box. It transmits the pupil position signal to the image control module. The image control module converts the image data into a light field 3D image, a parallax 3D image, or a planar image according to the viewing mode selected by the user, and simultaneously sends the human eye position signal to the image generation module to form an image beam. The image beam passes through the reflective freeform surface distortion compensation mirror and the reflective freeform surface field mirror in sequence before being projected onto the human eye.

[0007] This technical solution projects the display image onto the human eye from a distance using a reflective freeform field mirror and a reflective freeform distortion compensation mirror, allowing the observer to view the image without needing to get close to the virtual display. The image control module converts the image data into light field 3D images, parallax 3D images, or planar images according to the viewing mode selected by the user, and simultaneously sends the human eye position signal to the image generation module to form light field, 3D, and planar display sources. This allows the observer to freely switch between three modes: full parallax light field mode, naked-eye parallax 3D mode, and ordinary planar display mode, to adapt to the viewing needs of different scenarios.

[0008] Preferably, the reflective freeform field mirror is a front-coated concave mirror, and the reflective freeform distortion compensation mirror is a front-coated mirror. The reflective freeform field mirror is used to provide the field of view for the human eye, and the freeform distortion compensation mirror is used to compensate for the distortion of the reflective freeform field mirror and the left-right reversal of the image, while also folding the optical path.

[0009] Here, through the combined action of the reflective freeform surface distortion compensation mirror and the reflective freeform surface field mirror, the image emitted from the image generation module is magnified proportionally to form a huge display image. When observed by the human eye within the effective viewing space area, a 2D / 3D / light field fully compatible virtual display image can be observed.

[0010] Preferably, the dimensions of the reflective freeform field mirror satisfy the following: width greater than 2*d*tan15°, height greater than 2*d*tan15°, where d is the distance from the center of the effective viewing space area box to the reflective freeform field mirror; the reflective freeform distortion compensation mirror is a convex mirror or a concave mirror according to the designed magnification.

[0011] Preferably, the image generation module includes a planar light field display source, a beam splitter, and a directional backlight parallax naked-eye 3D display source. The planar light field display source provides full parallax without amplitude conflict stereoscopic display, and the directional backlight parallax naked-eye 3D display source provides planar 2D or full-resolution left-right parallax stereoscopic images. The planar light field display source and the directional backlight parallax naked-eye 3D display source are placed orthogonally, forming a 45° angle with the beam splitter's beam-splitting surface.

[0012] Here, a planar light field display source and a 2D / 3D switchable directional backlight parallax naked-eye 3D display source are coupled by a beam splitter, so that the image generation surface is consistent with the optical path of the human eye, and the two image display sources are orthogonal to each other.

[0013] Preferably, the optical path between the surface of the planar light field display source and the surface of the directional backlight parallax naked-eye 3D display source and the center of the beam-splitting surface of the beam-splitting lens is consistent.

[0014] Preferably, the image-side focal point of the optical module, which consists of a reflective freeform field mirror and a reflective freeform distortion compensation mirror, is located near the effective viewing space area box, allowing the human eye to move within the effective viewing space area box. The object-side focal point of the optical module is located at the surface of the planar light field display source and the surface of the backlit parallax naked-eye 3D display source.

[0015] Preferably, the planar light field display source includes a first polygonal backlight module, a first linear Fresnel lens array, a first linear diffusion film, a first liquid crystal display panel, a first phase retardation film, an imaging lens array, and a directional diffusion film arranged sequentially. The first polygonal backlight module is equipped with LED beads. When the system is in light field display mode, the planar light field display source is used for display, and the directional backlight parallax naked-eye 3D display source is turned off. The image control module sends the light field display image to the liquid crystal display panel and controls the corresponding LED beads on the first polygonal backlight module to light up according to the human eye position information captured by the human eye tracking module. A collimated light source is formed by the linear Fresnel lens array, diffused by the linear diffusion film, and the light field image on the liquid crystal display panel is projected into the air through the phase retardation film and the imaging lens array to form a light field display. The directional diffusion film is used to improve the spatial sampling rate. The light field display beam passes through a beam splitter, a reflective freeform surface distortion compensation mirror, and a reflective freeform surface field mirror to project the distortion-free magnified light field image to the human eye located in the effective viewing space area box.

[0016] Preferably, the directional backlight parallax naked-eye 3D display source includes a second polygonal backlight module, a second linear Fresnel lens array, a second linear diffusion film, a second liquid crystal display panel, and a second phase delay film arranged sequentially. The second polygonal backlight module is equipped with LED beads. When the system is in parallax naked-eye 3D display mode, the directional backlight parallax naked-eye 3D display source displays the image, and the planar light field display source (51) is turned off. The image control module sends the time-switched parallax image to the second liquid crystal display panel and controls the second polygonal backlight module to light up the LED beads corresponding to the left and right eyes according to the human eye tracking module capturing the human eye position information. Two left and right time-switched directional beams are formed through the second linear Fresnel lens array. The parallax image refreshed by the second liquid crystal display panel is accurately projected to the left and right eyes of the human through the beam splitter, the reflective freeform surface distortion compensation mirror, and the reflective freeform surface field mirror.

[0017] Preferably, when the system is in planar 2D display mode, the directional backlight parallax naked-eye 3D display source is used for display, the planar light field display source is turned off, the image control module sends the ordinary planar image to the second liquid crystal display panel and turns on all the backlight beads on the second polygonal backlight module. The ordinary 2D image displayed on the second liquid crystal display panel is projected to the human eye through the second linear Fresnel lens array and the second linear diffusion film, and then through the beam splitter, the reflective freeform surface distortion compensation mirror and the reflective freeform surface field mirror.

[0018] Preferably, let the width of the first liquid crystal display panel or the second liquid crystal display panel be w, the height be h, the focal length of the optical module be f, and the distance between the first liquid crystal display panel or the second liquid crystal display panel and the optical module be x. Then the width of the magnified virtual image is W = w * f / x, and the height is H = h * f / x, where x is generally between 0 and 30.

[0019] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0020] This invention proposes a 2D / 3D / light field fully compatible virtual imaging display system, including an eye-tracking module, an effective viewing space area box, an optical module, an image control module, and an image generation module. The system projects the display image onto the viewer's eye from a distance using a reflective freeform field mirror and a reflective freeform distortion compensation mirror, allowing the observer to view the image without needing to get close to the virtual display. The image control module converts the image data into light field 3D images, parallax 3D images, or planar images according to the user's selected viewing mode, and simultaneously sends the viewer's eye position signal to the image generation module to form light field, 3D, and planar display sources. This allows the observer to freely switch between three modes: full parallax light field mode, naked-eye parallax 3D mode, and ordinary planar display mode, to adapt to different viewing needs in various scenarios. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the 2D / 3D / light field fully compatible virtual imaging display system proposed in Embodiment 1 of the present invention;

[0022] Figure 2 This diagram illustrates the structural composition of the planar light field display source proposed in Embodiment 2 of the present invention.

[0023] Figure 3 This diagram illustrates the structural composition of the directional backlight parallax naked-eye 3D display source proposed in Embodiment 2 of the present invention.

[0024] Among them, 1-eye tracking module; 2-effective viewing space area box; 31-reflective freeform surface field mirror; 32-reflective freeform surface distortion compensation mirror; 4-image control module; 5-image generation module; 51-planar light field display source; 511-first polygonal backlight module; 512-first linear Fresnel lens array; 513-first linear diffusion film; 514-first liquid crystal display panel; 515-first phase retardation film; 516-imaging lens array; 517-directional diffusion film; 52-beam splitter; 53-directional backlight parallax naked-eye 3D display source; 531-second polygonal backlight module; 532-second linear Fresnel lens array; 533-second linear diffusion film; 534-second liquid crystal display panel; 535-second phase retardation film. Detailed Implementation

[0025] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0026] To better illustrate this embodiment, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions;

[0027] It is understandable to those skilled in the art that some well-known details may be omitted from the accompanying drawings.

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] The positional relationships depicted in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0030] Example 1

[0031] like Figure 1As shown, this embodiment proposes a 2D / 3D / light field fully compatible virtual imaging display system. The system includes: an eye-tracking module 1, an effective viewing space box 2, an optical module 3 composed of a reflective freeform surface field mirror 31 and a reflective freeform surface distortion compensation mirror 32, an image control module 4, and an image generation module 5. The reflective freeform surface field mirror 31 is the carrier for direct viewing by the human eye, and the reflective freeform surface distortion compensation mirror 32 compensates for the aberrations displayed by the reflective freeform surface field mirror 31. The eye-tracking module 1 is... Above the reflective freeform field mirror 31, the position of the human eye pupil located in the effective viewing space area box 2 is tracked, and the human eye pupil position signal is transmitted to the image control module 4. The image control module 4 converts the image data into a light field 3D image, a parallax 3D image, or a planar image according to the viewing mode selected by the user, and simultaneously sends the human eye position signal to the image generation module 5 to form an image beam. The image beam is emitted sequentially through the reflective freeform distortion compensation mirror 32 and the reflective freeform field mirror 31 and then projected onto the human eye.

[0032] In this embodiment, the effective viewing space area box 2 does not actually exist, but refers to the effective viewing cubic space area of ​​the 2D, 3D, and light field fully compatible virtual imaging display system. The dimensions of the reflective freeform field mirror 31 satisfy: width greater than 2*d*tan15°, height greater than 2*d*tan15°, where d is the distance from the center of the effective viewing space area box 2 to the reflective freeform field mirror 31; the reflective freeform distortion compensation mirror 32 is a convex mirror or a concave mirror according to the designed magnification. The reflective freeform field mirror 31 is a front-coated concave mirror, and the reflective freeform distortion compensation mirror 32 is a front-coated mirror. The reflective freeform field mirror 31 is used to provide the field of view for the human eye, and the freeform distortion compensation mirror 32 is used to compensate for the distortion of the reflective freeform field mirror 31 and the left-right reversal of the image. The reflective freeform distortion compensation mirror 32 compensates for the aberrations of the reflective freeform field mirror 31, such as distortion and field curvature, and at the same time corrects the mirror image problem of the outgoing image and folds the optical path.

[0033] See Figure 1 The image generation module 5 includes a planar light field display source 51, a beam splitter 52, and a directional backlight parallax naked-eye 3D display source 53. The planar light field display source 51 provides full parallax without amplitude conflict stereoscopic display, and the directional backlight parallax naked-eye 3D display source 53 provides planar 2D or full-resolution left-right parallax stereoscopic images. The planar light field display source 51 and the directional backlight parallax naked-eye 3D display source 53 are placed orthogonally, forming a 45° angle with the beam splitter surface of the beam splitter 52. In this embodiment, the optical path between the surface of the planar light field display source 51 and the surface of the directional backlight parallax naked-eye 3D display source 53 and the center of the beam splitter surface of the beam splitter 52 is consistent.

[0034] The image-side focal point of the optical module 3, which consists of a reflective freeform field mirror 31 and a reflective freeform distortion compensation mirror 32, is located near the effective viewing space area box 2, allowing the human eye to move within the effective viewing space area box 2. The object-side focal point of the optical module 3 is located at the surface of the planar light field display source 51 and the surface of the directional backlight parallax naked-eye 3D display source 53.

[0035] Example 2

[0036] The structural diagrams of the planar light field display source 51 and the directional backlight parallax naked-eye 3D display source 53 are as follows: Figure 2 and Figure 3 As shown, in a specific implementation, the image control module 4 is connected to the first polygonal backlight module 511, the second polygonal backlight module 531, the human eye tracking module 1, and the first liquid crystal display panel 514 and the second liquid crystal display panel 534 respectively. It extracts the human eye position signal collected by the human eye tracking module 2 and synchronously sends the human eye position signal to the first polygonal backlight module 511 or the second polygonal backlight module 531, and controls the display output of the first liquid crystal display panel 514 and the second liquid crystal display panel 534.

[0037] In this embodiment, see Figure 2 The planar light field display source 51 includes a first polygonal backlight module 511, a first linear Fresnel lens array 512, a first linear diffusion film 513, a first liquid crystal display panel 514, a first phase retardation film 515, an imaging lens array 516, and a directional diffusion film 517 arranged sequentially. The first polygonal backlight module 511 is equipped with LED beads. When the system is in light field display mode, the planar light field display source 51 is used for display, and the directional backlight parallax naked-eye 3D display source 53 is turned off. The image control module 4 sends the light field display image to the liquid crystal display panel 514 and controls the first linear backlight module 515 according to the human eye position information captured by the human eye tracking module 1. LED beads on a polygonal backlight module 511 are lit, forming a collimated light source through a linear Fresnel lens array 512. The light field image on the liquid crystal display panel 514 is diffused through a linear diffusion film 513 and projected into the air through a phase retardation film 515 and an imaging lens array 516 to form a light field display. The spatial sampling rate is improved by using a directional diffusion film 517. The light field display beam passes through a beam splitter 52, a reflective freeform surface distortion compensation mirror 32, and a reflective freeform surface field mirror 31 to project a distortion-free and magnified light field image to the human eye located in the effective viewing space area box 2. The human eye can observe a large-format stereoscopic light field image without amplitude conflict.

[0038] See Figure 3The directional backlight parallax naked-eye 3D display source 53 includes a second polygonal backlight module 531, a second linear Fresnel lens array 532, a second linear diffusion film 533, a second liquid crystal display panel 534, and a second phase retardation film 535 arranged sequentially. The second polygonal backlight module 531 is equipped with LED beads. When the system is in parallax naked-eye 3D display mode, the directional backlight parallax naked-eye 3D display source 53 displays the image, the planar light field display source 51 is turned off, and the image control module 4 displays the parallax map in a time-series switching format. The image is sent to the second liquid crystal display panel 534 and the human eye position information is captured by the human eye tracking module 2. The second polygon backlight module 531 is controlled to light up the LED beads corresponding to the left and right eyes. Two directional beams with left and right time switching are formed by the second linear Fresnel lens array 532. The parallax image refreshed by the second liquid crystal display panel 534 in time is accurately projected to the left and right eyes of the human through the beam splitter 52, the reflective freeform surface distortion compensation mirror 32 and the reflective freeform surface field mirror 31. The human eye can observe a parallax stereoscopic image with an impact.

[0039] When the system is in planar 2D display mode, the backlight parallax naked-eye 3D display source 53 is used for display, the planar light field display source 51 is turned off, the image control module 4 sends the ordinary planar image to the second liquid crystal display panel 534 and turns on all the backlight beads on the second polygonal backlight module 531. Through the second linear Fresnel lens array 532 and the second linear diffusion film 533, the ordinary 2D image displayed on the second liquid crystal display panel 534 is projected to the human eye through the beam splitter 52, the reflective freeform surface distortion compensation mirror 32 and the reflective freeform surface field mirror 31, so that the human eye can observe a large 2D image comfortably.

[0040] The functions of the first phase delay film 515 and the second phase delay film 535 are to adjust the output phase of the beam, so that the polarization of the output beams of the planar light field display source 51 and the directional backlight parallax naked-eye 3D display source 53 is consistent with the incident phase of the beam splitter 52, thus eliminating chromatic aberration.

[0041] Example 3

[0042] Let the width of the first liquid crystal display panel 514 or the second liquid crystal display panel 534 be w, the height be h, the focal length of the optical module be f, and the distance between the first liquid crystal display panel 514 or the second liquid crystal display panel 534 and the optical module be x. Then the width of the magnified virtual image is W = w * f / x, and the height is H = h * f / x, where x is generally between 0 and 30.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A 2D / 3D / light field fully compatible virtual imaging display system, characterized in that, The system includes: an eye-tracking module (1), an effective viewing space area box (2), an optical module (3) consisting of a reflective freeform field mirror (31) and a reflective freeform distortion compensation mirror (32), an image control module (4), and an image generation module (5); the reflective freeform field mirror (31) is the direct viewing medium for the human eye, and the reflective freeform distortion compensation mirror (32) compensates for the aberrations displayed by the reflective freeform field mirror (31). The eye-tracking module (1) is located within the reflective freeform field mirror. Above (31), the position of the human eye pupil located in the effective viewing space area box (2) is tracked, and the human eye pupil position signal is transmitted to the image control module (4). The image control module (4) converts the image data into light field 3D image, parallax 3D image or planar image according to the viewing mode selected by the user, and simultaneously sends the human eye position signal to the image generation module (5) to form an image beam. The image beam is emitted from the reflective freeform surface distortion compensation mirror (32) and the reflective freeform surface field mirror (31) in sequence and then projected to the human eye. The image generation module (5) includes a planar light field display source (51), a beam splitter (52), and a directional backlight parallax naked-eye 3D display source (53). The planar light field display source (51) provides full parallax without amplitude conflict stereoscopic display. The directional backlight parallax naked-eye 3D display source (53) provides planar 2D or full resolution left and right parallax stereoscopic images. The planar light field display source (51) and the directional backlight parallax naked-eye 3D display source (53) are placed orthogonally, and form a 45° angle with the beam splitter (52). The directional backlight parallax naked-eye 3D display source (53) includes a second polygonal backlight module (531), a second linear Fresnel lens array (532), a second linear diffusion film (533), a second liquid crystal display panel (534), and a second phase retardation film (535) arranged sequentially. The second polygonal backlight module (531) is equipped with LED beads. When the system is in parallax naked-eye 3D display mode, the directional backlight parallax naked-eye 3D display source (53) displays, the planar light field display source (51) is turned off, and the image control module (4) switches the timing. The parallax image is sent to the second liquid crystal display panel (534) and the human eye position information is captured by the human eye tracking module (1). The second polygon backlight module (531) is controlled to light up the LED beads corresponding to the left and right eyes. Two left and right time-switching directional beams are formed through the second linear Fresnel lens array (532). The parallax image refreshed by the second liquid crystal display panel (534) is accurately projected to the left and right eyes of the human through the beam splitter (52), the reflective freeform surface distortion compensation mirror (32) and the reflective freeform surface field mirror (31). When the system is in planar 2D display mode, the directional backlight parallax naked-eye 3D display source (53) is used for display, the planar light field display source (51) is turned off, the image control module (4) sends the ordinary planar image to the second liquid crystal display panel (534) and turns on all the backlight beads on the second polygonal backlight module (531). The ordinary 2D image displayed on the second liquid crystal display panel (534) is projected to the human eye through the beam splitter (52), the reflective freeform surface distortion compensation mirror (32) and the reflective freeform surface field mirror (31) to achieve distortion-free magnification of the light field image.

2. The 2D / 3D / light field fully compatible virtual imaging display system according to claim 1, characterized in that, The reflective freeform field mirror (31) is a front-coated concave mirror, and the reflective freeform distortion compensation mirror (32) is a front-coated mirror. The reflective freeform field mirror (31) is used to provide the field of view for human eyes, and the freeform distortion compensation mirror (32) is used to compensate for the distortion of the reflective freeform field mirror (31) and the left-right reversal of the image, while folding the optical path.

3. The 2D / 3D / light field fully compatible virtual imaging display system according to claim 2, characterized in that, The dimensions of the reflective freeform field mirror (31) satisfy: the width is greater than 2*d*tan15° and the height is greater than 2*d*tan15°, where d is the distance from the center of the effective viewing space area box (2) to the reflective freeform field mirror (31); the reflective freeform distortion compensation mirror (32) is a convex mirror or a concave mirror according to the designed magnification.

4. The 2D / 3D / light field fully compatible virtual imaging display system according to claim 1, characterized in that, The optical path between the surface of the planar light field display source (51) and the surface of the directional backlight parallax naked-eye 3D display source (53) and the center of the beam splitter (52) is consistent.

5. The 2D / 3D / light field fully compatible virtual imaging display system according to claim 4, characterized in that, The image-side focal point of the optical module (3), which consists of a reflective freeform field mirror (31) and a reflective freeform distortion compensation mirror (32), is located near the effective viewing space area box (2), allowing the human eye to move within the effective viewing space area box (2). The object-side focal point of the optical module (3) is located at the surface of the planar light field display source (51) and the surface of the directional backlight parallax naked-eye 3D display source (53).

6. The 2D / 3D / light field fully compatible virtual imaging display system according to claim 4, characterized in that, The planar light field display source (51) includes a first polygonal backlight module (511), a first linear Fresnel lens array (512), a first linear diffusion film (513), a first liquid crystal display panel (514), a first phase retardation film (515), an imaging lens array (516), and a directional diffusion film (517) arranged sequentially. The first polygonal backlight module (511) is equipped with LED beads. When the system is in light field display mode, the planar light field display source (51) is used for display, and the directional backlight parallax naked-eye 3D display source (53) is turned off. The image control module (4) sends the light field display image to the first liquid crystal display panel (514) and captures it according to the human eye tracking module (1). The obtained eye position information controls the corresponding LED beads on the first polygonal backlight module (511) to light up, forming a collimated light source through the first linear Fresnel lens array (512), which diffuses through the first linear diffusion film (513), and projects the light field image on the first liquid crystal display panel (514) into the air through the first phase delay film (515) and the imaging lens array (516) to form a light field display. The spatial sampling rate is improved by using the directional diffusion film (517), and the light field display beam is projected into the human eye located in the effective viewing space area box (2) through the beam splitter (52), the reflective freeform surface distortion compensation mirror (32) and the reflective freeform surface field mirror (31) to project the distortion-free magnified light field image into the human eye located in the effective viewing space area box (2).

7. The 2D / 3D / light field fully compatible virtual imaging display system according to claim 1, characterized in that, Let the width of the first liquid crystal display panel (514) or the second liquid crystal display panel (534) be w, the height be h, the focal length of the optical module be f, and the distance between the first liquid crystal display panel (514) or the second liquid crystal display panel (534) and the optical module be x. Then the width of the magnified virtual image is W=w*f / x, and the height is H=h*f / x, where x is generally between 0 and 30.

Images