Light field display device and wearable equipment

Abstract

The invention discloses a light field display device and wearable equipment, which are used for improving the uniformity of a divergence angle. The embodiment of the invention provides a light field display device. The light field display device comprises a display panel, a light control structure located on the light emitting side of the display panel, an off-axis reflection structure located on the side, away from the display panel, of the light control structure, and a phase modulation structure located between the display panel and the off-axis reflection structure. The off-axis reflection structure comprises a reflection curved surface; the reflection curved surface is used for converging light reaching the reflection curved surface to human eyes; the extension direction of the connecting line of the center of the display panel and the center of the phase modulation structure is different from the extension direction of the connecting line of the center of the reflection curved surface and the center of the human eye corresponding to the reflection curved surface.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light field display device and a wearable device. Background Art

[0002] In current reflective near-eye 3D display systems, the light emitted by the display panel needs to be modulated at the light output angle, and then incident on the reflective eyepiece at different central light output angles, thereby forming an augmented reality (VR) or virtual reality (AR) optical path. However, in the prior art, after the light emitted by the display panel is modulated at the angle of the main light axis, the divergence angle at different positions varies unevenly, making the display system design more difficult. Summary of the invention

[0003] The embodiments of the present application provide a light field display device and a wearable device to improve the uniformity of the divergence angle.

[0004] An embodiment of the present application provides a light field display device, the light field display device comprising: a display panel, a light control structure located on a light emitting side of the display panel, an off-axis reflection structure located on a side of the light control structure away from the display panel, and a phase modulation structure located between the display panel and the off-axis reflection structure;

[0005] The off-axis reflection structure includes a reflection curved surface; the reflection curved surface is used to: converge light reaching the reflection curved surface to the human eye;

[0006] The extending direction of the line connecting the center of the display panel and the center of the phase modulation structure is different from the extending direction of the line connecting the center of the reflective curved surface and the center of the human eye corresponding to the reflective curved surface.

[0007] In some embodiments, the phase modulation structure is a first lens.

[0008] In some embodiments, the first lens includes: a first surface facing a side of the light control structure, and a second surface facing away from the light control structure;

[0009] The first surface is a curved surface convex toward one side of the light control structure;

[0010] The second surface is a plane, and the second surface is parallel to the light emitting surface of the display panel.

[0011] In some embodiments, the first lens includes: a first surface facing the light control structure, and a second surface facing away from the light control structure; the second surface is a convex curved surface on the side facing away from the light control structure;

[0012] The phase modulation structure further includes: a reflective film covering the second surface; the reflective film includes a first curved surface in contact with the second surface;

[0013] The phase modulation structure is multiplexed into an off-axis reflection structure, and the first curved surface is multiplexed into a reflection curved surface.

[0014] In some embodiments, the first surface is a curved surface that is convex toward one side of the light control structure.

[0015] In some embodiments, the material of the first lens includes at least one of glass or plastic.

[0016] In some embodiments, the phase modulation structure includes a metasurface lens.

[0017] In some embodiments, the metasurface lens includes: a first substrate, and a plurality of periodically arranged metasurface nanorods located on a side of the first substrate facing away from the light control structure.

[0018] In some embodiments, the metasurface nanopillars are cylindrical nanopillars.

[0019] In some embodiments, the phase of the metasurface nanorods Satisfies the following formula:

[0020]

[0021] Among them, n eff is the equivalent refractive index of the metasurface lens, λ is the wavelength range of the incident light of the metasurface lens, and H is the thickness of the metasurface nanocolumn in the direction perpendicular to the first substrate.

[0022] In some embodiments, the material of the metasurface nanorods includes silicon nitride.

[0023] In some embodiments, the light control structure includes a plurality of micro lenses arranged in an array.

[0024] In some embodiments, the display panel includes pixel groups corresponding one-to-one to the microlenses;

[0025] The pixel group includes n pixels, where n is an integer greater than or equal to 2;

[0026] The orthographic projection of the microlens on the display panel covers at least a portion of the area of ​​the pixel group corresponding to the microlens;

[0027] The light emitted by the pixel group passes through the microlens and phase modulation structure to reach the semi-transparent and semi-reflective structure and converges to the pupil of a single eye.

[0028] In some embodiments, the light field display device includes: two display panels corresponding to the left eye and the right eye respectively, two off-axis reflection structures corresponding to the left eye and the right eye respectively, two phase modulation structures corresponding to the left eye and the right eye respectively, and two light control structures corresponding to the left eye and the right eye respectively.

[0029] A wearable device provided in an embodiment of the present application includes the light field display device provided in an embodiment of the present application.

[0030] The light field display device and wearable device provided in the embodiments of the present application can improve the uniformity of the divergence angle at different positions and reduce the difficulty of designing the surface shape of the reflective surface by setting a phase modulation structure to adjust the phase of the light reaching the phase modulation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of a display device provided for related art;

[0033] Figure 2 A schematic diagram of the structure of a light field display device provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the structure of another light field display device provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the structure of another light field display device provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of a metasurface lens in a light field display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. And in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of this application.

[0038] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0039] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, but are only intended to illustrate the content of the present application. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0040] In the related art, the divergence angle distribution of the display panel of the near-eye display device is as follows: Figure 1 As shown, the light emitted by the display panel 1 reaches the off-axis reflective lens 7 and is reflected to the human eye. Points A and B are the edges of the display panel. The light emission angle (CRA) of the midpoint of A and B (i.e., the center of the display panel) is 7.20°, the CRA at A is -12.74°, and the CRA at B is 11.12°, that is, since the reflective lens is an off-axis reflective lens, the CRA of the display panel is not symmetrical. The divergence angles at the edges A and B on both sides of the display panel 1 and the midpoints A and B corresponding to different incident light spots are shown in Table 1. It should be noted that the EB 0.5 divergence angle represents the divergence angle when the incident light spot is 0.5 millimeters (mm). Taking the EB 0.5 divergence angle as an example, the ratio of the divergence angles at A and B is 1:1.82. Since the CRA of the off-axis reflective lens is asymmetric, the uniformity of the divergence angles at different positions of the display panel is poor. The design of the display device is relatively difficult.

[0041] Table 1

[0042] A A, B midpoint B EB6 divergence angle 12.01 14.89 21.70 EB4 divergence angle 8.03 9.87 14.53 EB2 divergence angle 4.00 4.92 7.28 EB1 divergence angle 2.00 2.46 3.64 EB 0.5 divergence angle 1.00 1.23 1.82

[0043] The present application embodiment provides a light field display device, such as Figure 2 As shown, the light field display device includes: a display panel 1, a light control structure 2 located on the light emitting side of the display panel 1, an off-axis reflection structure 3 located on the side of the light control structure 2 away from the display panel 1, and a phase modulation structure 4 located between the display panel 1 and the off-axis reflection structure 3;

[0044] The off-axis reflection structure 3 includes a reflection curved surface 301; the reflection curved surface 301 is used to: converge the light reaching the reflection curved surface 301 to the human eye 6;

[0045] The extending direction of the line 7 connecting the center of the display panel 1 and the center of the phase modulation structure 4 is different from the extending direction of the line 8 connecting the center of the reflective curved surface 301 and the center of the human eye 6 corresponding to the reflective curved surface 301 .

[0046] In the light field display device provided in the embodiment of the present application, the phase modulation structure is used to reduce the difference in divergence angles at different positions of the display panel, that is, by setting the phase modulation structure to adjust the phase of light reaching the phase modulation structure, the difference in divergence angles at different positions of the display panel is reduced, which can improve the uniformity of the divergence angles at different positions and reduce the difficulty in designing the surface shape of the reflective surface.

[0047] In some embodiments, Figure 2 As shown, the light emitted from the phase modulation structure 4 is collimated light.

[0048] In the light field display device provided in the embodiment of the present application, the light emitted by the display panel passes through the light control structure and the phase modulation structure and is collimated to be incident on the reflective surface of the off-axis reflective structure. In this way, while improving the uniformity of the divergence angles at different positions, the size of the light spot formed by the light emitted from each position of the display panel and arriving at the reflective surface can be made smaller, and the light spots formed by the light emitted from different positions of the display panel and arriving at the reflective surface do not overlap with each other, thereby further reducing the difficulty of designing the surface shape of the reflective concave surface and improving the imaging quality.

[0049] In some embodiments, Figure 2 As shown, the reflective curved surface 301 is a convex curved surface facing away from the human eye 6 and the display panel 1. The surface shape of the reflective curved surface is, for example, a free-form curved surface.

[0050] In some embodiments, Figure 2 As shown, the phase modulation structure 4 is a first lens 4-1.

[0051] The light field display device provided in the embodiment of the present application uses the first lens as a phase modulation structure to adjust the phase of the light reaching the first lens, so that the light reaches the reflective surface in a collimated manner, which can improve the uniformity of the divergence angles at different positions and reduce the difficulty of designing the surface shape of the reflective surface.

[0052] In a specific implementation, the material of the first lens includes at least one of glass or plastic.

[0053] In some embodiments, Figure 2 As shown, the first lens 4 - 1 includes: a first surface 401 facing the light control structure 2 , and a second surface 402 facing away from the light control structure 2 ;

[0054] The first surface 401 is a curved surface convex toward one side of the light control structure 2;

[0055] The second surface 402 is a plane, and the second surface 402 is parallel to the light emitting surface 9 of the display panel 1 .

[0056] In some embodiments, Figure 3 As shown, the first lens 4 - 1 includes: a first surface 401 facing the light control structure 2, and a second surface 402 facing away from the light control structure 2; the second surface 402 is a convex curved surface on the side facing away from the light control structure 2;

[0057] The phase modulation structure 4 further includes: a reflective film 403 covering the second surface 402; the reflective film 403 includes a first curved surface 4031 in contact with the second surface 402;

[0058] The phase modulation structure 4 is multiplexed into the off-axis reflection structure 3 , and the first curved surface 4031 is multiplexed into the reflection curved surface 301 .

[0059] That is, the light field display device provided in the embodiment of the present application integrates the phase modulation structure with the off-axis reflection structure.

[0060] It should be noted that when the first lens and the off-axis reflection structure are independently arranged and located between the light control structure and the off-axis reflection structure, the light emitted by the display panel passes through the light control structure and reaches the edge of the first lens (for example Figure 2 Interference will occur at point C in the middle, disrupting the propagation path of light and affecting the display effect.

[0061] The light field display device provided in the embodiment of the present application integrates the phase modulation structure with the off-axis reflection structure, which can avoid interference at the edge of the first lens due to the situation that the first lens and the off-axis reflection structure are independently provided and located between the light control structure and the off-axis reflection structure, thereby improving the display effect.

[0062] In some embodiments, Figure 3 As shown, the first surface 401 is a curved surface convex toward one side of the light control structure 2 .

[0063] In some embodiments, the phase modulation structure 4 includes a metasurface lens 4 - 2 .

[0064] It should be noted that the metasurface lens is based on a metasurface structural unit with a discrete phase modulation effect, which is discretely and correspondingly arranged according to the required phase expression to achieve a beam modulation effect under conditions of low device thickness (hundreds of nanometers).

[0065] The light field display device provided in the embodiment of the present application sets a metasurface lens as a phase modulation structure. The metasurface lens adjusts the phase of the light reaching the first lens so that the light reaches the reflective surface in a collimated manner, thereby improving the uniformity of the divergence angles at different positions and reducing the difficulty of designing the surface shape of the reflective surface.

[0066] In some embodiments, Figure 4 As shown, the light incident surface 10 of the metasurface lens 4 - 2 and the light emitting surface 11 of the metasurface lens 4 - 2 are both parallel to the light emitting surface 9 of the display panel 1 .

[0067] In some embodiments, Figure 5 As shown, the metasurface lens 4 - 2 includes: a first substrate 405 , and a plurality of periodically arranged metasurface nanorods 404 located on a side of the first substrate 405 away from the light control structure 2 .

[0068] That is, the metasurface nanocolumns are used as metasurface structural units. In specific implementation, the phase can be adjusted by adjusting the period, duty cycle, height, etc. of the metasurface nanocolumns, so as to reduce the difference in divergence angles of light emitted from different positions of the display panel, improve the uniformity of the divergence angle, and reduce the difficulty of designing the reflective curved surface.

[0069] In some embodiments, the material of the supersurface nanorods includes silicon nitride. Of course, the supersurface nanorods may also include other high refractive index materials.

[0070] In some embodiments, Figure 5 As shown, the supersurface nanorods 404 are cylindrical nanorods.

[0071] In some embodiments, Figure 5 As shown, the metasurface lens 4 - 2 also includes: a filling portion 406 located between the metasurface nanocolumns 404 .

[0072] In some embodiments, the refractive index of the metasurface nanorods is different from the refractive index of the filling portion.

[0073] It should be noted that in the light field display device provided in the embodiment of the present application, the metasurface lens is a transmission-type transmissive metasurface structure, which is based on the equivalent refractive index formed by the high-refractive-index material within the unit period condition of the metasurface nanocolumn, combined with the height of the metasurface nanocolumn to achieve the required phase delay solution.

[0074] In a specific implementation, any phase distribution can be achieved as long as the period, duty cycle, height of the metasurface nanocolumns, and the difference between the refractive index of the metasurface nanocolumns and the refractive index of the filling portion satisfy the required equivalent refractive index curve.

[0075] In some embodiments, the phase of the metasurface nanorods 404 Satisfies the following formula:

[0076]

[0077] Among them, n eff is the equivalent refractive index of the metasurface lens, λ is the wavelength range of the incident light of the metasurface lens, and H is the thickness of the metasurface nanocolumn in the direction perpendicular to the first substrate.

[0078] In some embodiments, Figure 3 As shown, the light control structure 2 includes a plurality of micro lenses 201 arranged in an array.

[0079] In some embodiments, the display panel includes pixel groups corresponding one-to-one to the microlenses;

[0080] The pixel group includes n pixels, where n is an integer greater than or equal to 2;

[0081] The orthographic projection of the microlens on the display panel 1 covers at least a portion of the area of ​​the pixel group corresponding to it;

[0082] The light emitted by the pixel group passes through the microlens and phase modulation structure to reach the semi-transparent and semi-reflective structure and converges to the pupil of a single eye.

[0083] In a specific implementation, multiple microlenses are used to direct the light emitted by the sub-pixel into the eye at different angles. For example, multiple microlenses collimate the light emitted by the sub-pixel into the eye at different angles, and a single eye can achieve n viewpoints. The n viewpoints fill the eyebox, thereby realizing near-eye light field display.

[0084] It should be noted that the light field display device provided in the embodiment of the present application is a three-dimensional (3D) light field display device based on light field display. Light field display can realize a true 3D scene like the real world. Generally, a light beam with a known direction is called a light field in space, referred to as a light field. In the light field, the light beam entering the pupil needs to have an intersection in space to form an image. One pixel represents a light ray, corresponding to one viewpoint. In order to realize the light field display, the pupil of a single eye needs to receive at least two viewpoints at the same time. The light emitted by this pixel propagates to the pupil position to form a viewing area, so that the depth of field plane of the single eye can be adjusted. The clear and blurred transformation of different depths of field planes can be achieved by focusing the human eye lens, so that the focus of the single eye and the convergence of both eyes on the same plane can be achieved, avoiding the human eye from perceiving the convergence conflict and causing visual fatigue.

[0085] In specific implementation, different viewpoints are incident on different positions of the pupil, and different viewpoints form intersections in space, thereby forming different depths of field planes. A single eye can focus on different depths of field planes according to different convergence angles to avoid focusing and convergence conflicts between the two eyes. At the same time, different image renderings can be adjusted according to the focusing state of the human eye to achieve switching between different depths of field planes.

[0086] In some embodiments, the number of pixels included in the pixel group is less than or equal to 30. That is, n is greater than or equal to 2 and less than or equal to 30.

[0087] Furthermore, in order to achieve multi-viewpoint display to improve display effect, n can be set to be greater than or equal to 4 and less than or equal to 30.

[0088] In some embodiments, light emitted from the i-th pixel of multiple pixel groups passes through the light control structure and reaches the first curved surface, and then converges to the same position of the human eye at different angles; wherein i is an integer greater than or equal to 1 and less than or equal to n.

[0089] In a specific implementation, the angles of entry of the i-th pixel of the plurality of pixel groups to the reflective curved surface after passing through the light control structure are different.

[0090] It should be noted that any area where different light rays converge on the pupil of a single eye can be considered as the same area where the light rays converge on the human eye.

[0091] It should be noted that each pixel group includes n pixels, that is, each pixel group corresponds to n views (1st to nth), and the display panel can be considered to correspond to n views. The i-th views corresponding to multiple pixel groups have the same eye-entry position, but different i-th views have different eye-entry angles.

[0092] In a specific implementation, the microlens is a ball lens; or, the microlens includes a first cylindrical lens and a second cylindrical lens that are stacked; the extension directions of the first cylindrical lens 4 and the second cylindrical lens intersect, so that the function of the two stacked cylindrical lenses can be equivalent to a ball lens; for example, the extension directions of the first cylindrical lens and the second cylindrical lens are perpendicular.

[0093] In some embodiments, Figure 2 As shown, the imaging plane 8 of the light emitted from the display panel by the light control structure 2 is located between the light control structure 2 and the phase modulation structure 4 .

[0094] In some embodiments, the light control structure is bonded to the display panel. For example, the light control structure is bonded to the display panel by bonding adhesive.

[0095] In a specific implementation, a pixel includes three sub-pixel units, for example, red sub-pixel units, blue sub-pixel units and green sub-pixel units. A red sub-pixel unit includes red sub-pixels, a blue sub-pixel unit includes blue sub-pixels, and a green sub-pixel unit includes green sub-pixels.

[0096] In some embodiments, the first light emitting surface of the display panel is located at the focal plane of the plurality of micro lenses. The first light emitting surface is the plane where the light emitting surface of the sub-pixel is located, and the position of the first light emitting surface is different for different types of display panels.

[0097] In some embodiments, the display panel is an electroluminescent display panel.

[0098] In some embodiments, when the display panel is an electroluminescent display panel, the sub-pixel includes a light emitting device.

[0099] In a specific implementation, the light emitting device may be, for example, an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), a micro inorganic light emitting diode (micro LED), or a mini light emitting diode (mini LED). That is, the electroluminescent display panel may be, for example, an organic light emitting diode (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, a micro inorganic light emitting diode (micro LED) display panel, or a mini light emitting diode (mini LED) display panel.

[0100] In a specific implementation, the first light emitting surface is the plane where the light emitting surfaces of the light emitting layers of the multiple light emitting devices are located.

[0101] In a specific implementation, when the display panel is an electroluminescent display panel, the sub-pixel further includes a color filter, which is located on the light-emitting side of the light-emitting device. The light-emitting devices included in the display panel have the same light-emitting color, and color conversion is achieved through the color filter to perform full-color display. The first light-emitting surface is the light-emitting surface of the color filter.

[0102] Alternatively, in some embodiments, the display panel is a liquid crystal display panel. The liquid crystal display panel includes a color film, and the first light emitting surface is the light emitting surface of the color film.

[0103] In some embodiments, the light field display device includes: two display panels corresponding to the left eye and the right eye respectively, two off-axis reflection structures corresponding to the left eye and the right eye respectively, two phase modulation structures corresponding to the left eye and the right eye respectively, and two light control structures corresponding to the left eye and the right eye respectively.

[0104] That is, in a specific implementation, a group of display panels, light control structures, phase modulation structures, and off-axis reflection structures correspond to the left eye or the right eye. In a specific implementation, when the phase modulation structure and the off-axis reflection structure are independently arranged, it can be arranged that the display panel, the light control structure, and the phase modulation structure are located above the human eye and the off-axis reflection structure. When the phase modulation structure is integrated with the off-axis reflection structure, that is, the phase modulation structure is multiplexed as the off-axis reflection structure, it can be arranged that the display panel and the light control structure are located above the human eye and the off-axis reflection structure. For a group of display panels, light control structures, phase modulation structures, and off-axis reflection structures, the center of the plane where the display panel is located, the center of the plane where the light control structure is located, the center of the phase modulation structure, the optical axis of the off-axis reflection structure, and the center of the monocular pupil corresponding to each structure of the group are located in the same plane, and the plane is perpendicular to the binocular arrangement direction.

[0105] In a specific implementation, the two display panels display the same picture.

[0106] In a specific implementation, the two display panels have the same parameters such as composition and size, the two light control structures have the same parameters such as composition and size, the two phase modulation structures have the same parameters such as composition and size, and the two off-axis reflection structures have the same parameters such as composition and size. The positional relationship between the display panel, light control structure, phase modulation structure, and off-axis reflection structure corresponding to the left eye is the same as the positional relationship between the display panel, light control structure, phase modulation structure, and off-axis reflection structure corresponding to the right eye.

[0107] Next, Figure 2 Taking the light field display device provided in the embodiment of the present application as an example, the effect of improving the uniformity of divergence angles at different positions by setting a phase modulation structure is illustrated. Figure 2 In the figure, A' and B' are the edges of the display panel 1, and the midpoints of A' and B' are the center of the display panel. The CRA of the midpoints of A' and B' is 0°, the CRA at A is -5.88°, and the CRA at B is 13.86°. The divergence angles at the edges A' and B' on both sides of the display panel 1 and the midpoints of A' and B' corresponding to different incident light spots are shown in Table 2. It should be noted that the EB 0.5 divergence angle represents the divergence angle when the incident light spot is 0.5 mm. Taking the EB0.5 divergence angle as an example, the ratio of the divergence angles at A' and B' is 1:1.52. Compared with the ratio of the divergence angles at A' and B' in the related technology of 1:1.82, the uniformity of the divergence angle can be improved by about 20%.

[0108] Table 2

[0109] A A, B midpoint B EB6 divergence angle 9.54 11.28 14.52 EB4 divergence angle 6.35 7.52 9.72 EB2 divergence angle 3.17 3.76 4.80 EB1 divergence angle 1.59 1.88 2.40 EB 0.5 divergence angle 0.79 0.94 1.20

[0110] A wearable device provided in an embodiment of the present application includes the light field display device provided in an embodiment of the present application.

[0111] In a specific implementation, the off-axis reflection structure is used as an eyepiece of a wearable device, for example.

[0112] The wearable device provided in the embodiment of the present application is: any wearable product or component with display function, such as a wearable helmet and wearable glasses. Other essential components of the wearable device should be understood by ordinary technicians in the field, and will not be repeated here, nor should they be used as limitations on the present application. The implementation of the wearable device can refer to the embodiment of the light field display device mentioned above, and the repeated parts will not be repeated.

[0113] In summary, the light field display device and wearable device provided in the embodiments of the present application can improve the uniformity of the divergence angle at different positions and reduce the difficulty of designing the reflective surface shape by setting a phase modulation structure to adjust the phase of the light reaching the phase modulation structure.

[0114] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0115] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A light field display device, characterized in that: The light field display device comprises: a display panel, a light control structure located on the light emitting side of the display panel, an off-axis reflection structure located on the side of the light control structure away from the display panel, and a phase modulation structure located between the display panel and the off-axis reflection structure; The off-axis reflection structure comprises a reflection curved surface; the reflection curved surface is used to: converge the light reaching the reflection curved surface to the human eye; An extending direction of a line connecting the center of the display panel and the center of the phase modulation structure is different from an extending direction of a line connecting the center of the reflective curved surface and the center of a human eye corresponding to the reflective curved surface.

2. The light field display device according to claim 1, characterized in that: The phase modulation structure is a first lens.

3. The light field display device according to claim 2, characterized in that: The first lens comprises: a first surface facing one side of the light control structure, and a second surface facing away from the light control structure; The first surface is a curved surface convex toward one side of the light control structure; The second surface is a plane, and the second surface is parallel to the light emitting surface of the display panel.

4. The light field display device according to claim 2, characterized in that: The first lens comprises: a first surface facing the light control structure, and a second surface facing away from the light control structure; the second surface is a convex curved surface on the side facing away from the light control structure; The phase modulation structure further includes: a reflective film covering the second surface; the reflective film includes a first curved surface in contact with the second surface; The phase modulation structure is multiplexed into the off-axis reflection structure, and the first curved surface is multiplexed into the reflection curved surface.

5. The light field display device according to claim 4, characterized in that: The first surface is a curved surface that is convex toward one side of the light control structure.

6. The light field display device according to any one of claims 2 to 5, characterized in that: The material of the first lens includes at least one of glass and plastic.

7. The light field display device according to claim 1, characterized in that: The phase modulation structure includes a metasurface lens.

8. The light field display device according to claim 7, characterized in that: The metasurface lens includes: a first substrate, and a plurality of periodically arranged metasurface nanocolumns located on a side of the first substrate away from the light control structure.

9. The light field display device according to claim 8, characterized in that: The super surface nano column is a cylindrical nano column.

10. The light field display device according to claim 8 or 9, characterized in that: Phase of the metasurface nanopillars Satisfies the following formula: Among them, n eff is the equivalent refractive index of the metasurface lens, λ is the wavelength range of the incident light of the metasurface lens, and H is the thickness of the metasurface nanocolumn in a direction perpendicular to the first substrate.

11. The light field display device according to claim 8 or 9, characterized in that: The material of the super surface nano column includes silicon nitride.

12. The light field display device according to any one of claims 1 to 5 and 7 to 9, characterized in that: The light control structure includes a plurality of micro lenses arranged in an array.

13. The light field display device according to claim 12, characterized in that: The display panel includes pixel groups corresponding to the microlenses one by one; The pixel group includes n pixels, where n is an integer greater than or equal to 2; The orthographic projection of the microlens on the display panel covers at least a portion of the pixel group corresponding thereto; The light emitted by the pixel group passes through the microlens and the phase modulation structure and reaches the semi-transmissive and semi-reflective structure and converges to the pupil of a single eye.

14. The light field display device according to any one of claims 1 to 5, 7 to 9, and 13, characterized in that: The light field display device includes: two display panels corresponding to the left eye and the right eye respectively, two off-axis reflection structures corresponding to the left eye and the right eye respectively, two phase modulation structures corresponding to the left eye and the right eye respectively, and two light control structures corresponding to the left eye and the right eye respectively.

15. A wearable device, characterized in that: It comprises the light field display device according to any one of claims 1 to 14.

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