A field-of-view control device applied to an optical imaging system and an optical imaging system

Abstract

A field of view control device (3) applicable to an optical imaging system (100) and an optical imaging system (100), the field of view control device (3) applicable to the optical imaging system (100) includes a base (302) capable of transmitting light, and a plurality of light-shielding portions (303) respectively provided on the base (302), parallel to each other, sequentially provided in a first direction of the base (302), and at least two adjacent ones being spaced apart to form a light-transmitting region between the two adjacent ones.

Description

[Technical field]

[0001] The present application relates to the field of optical manufacturing, and more particularly to a field of view control device applied to an optical imaging system and an optical imaging system. [Background technology]

[0002] The official name of the flat lens is an equivalent negative refractive index flat lens. The two periodically distributed layers of arrayed optical waveguides are perpendicular to each other, causing light rays to be totally reflected once by each of the two layers of arrayed optical waveguides. Because of their perpendicular rectangular structure, the angle of incidence at the first total reflection is the same as the angle of emergence at the second total reflection. After passing through the flat lens, all light rays within the divergence angle of the light source converge accordingly into a three-dimensional space that is plane-symmetrical to the flat lens, resulting in a 1:1 floating real image. The viewing angle of displays currently on the market that are used as image sources is large, reaching nearly 180 degrees. In this case, the characteristic of flat lens imaging is that when an observer observes a floating real image, they will see oblique afterimages on both sides of the real image. As the position of the human eye deviates from the normal viewing position and the deviation angle gradually increases, the floating real image becomes increasingly blurred, and one of the afterimages on the left and right sides of the real image becomes clearer and the other becomes blurred. The appearance of the afterimages will have a significant impact on the user's observation of the floating real image. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application aims to solve at least one of the technical problems existing in the prior art, and therefore, one objective of the present application is to provide a field of view control device applicable to an optical imaging system, which can reduce the size of the field of view angle of the optical imaging system, thereby suppressing the occurrence of afterimages on both sides of a floating real image in the optical imaging system, and improving the user's viewing experience. [Means for solving the problem]

[0004] This application further proposes an optical imaging system.

[0005] The field of view control device applied to the optical imaging system according to this application includes a substrate that can transmit light, and a plurality of light-shielding portions that are all provided on the substrate and are parallel to each other, and are sequentially provided in a first direction of the substrate. Among the plurality of light-shielding portions, at least two adjacent light-shielding portions are spaced apart from each other to form a light-transmitting region between the two adjacent light-shielding portions.

[0006] The field of view control device applied to the optical imaging system according to this application can reduce the size of the field of view angle of the optical imaging system by combining the substrate and the plurality of light-shielding portions. Thereby, the generation of afterimages on both sides of the floating real image in the optical imaging system is suppressed, and the viewing experience of the user can be improved.

[0007] Additional aspects and advantages of this application will be partially shown in the following description, or will become apparent from the following description, or will be understood through the practice of this application.

Brief Description of the Drawings

[0008]

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Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present application will be described in detail. Examples of the embodiments are shown in the drawings, and the same or similar reference numerals from the beginning to the end indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are used for interpreting the present application and should not be understood as limiting the present application.

[0010] Hereinafter, the field of view control device 3 applied to the optical imaging system 100 according to the embodiment of the present application will be described with reference to FIGS. 1-26.

[0011] As shown in FIGS. 19 - 26, an optical imaging system 100 according to an embodiment of the present application includes a flat lens 1, a display 2, and a field of view control device. The display 2 is for emitting light rays toward the flat lens 1, and the light rays emitted from the display 2 toward the flat lens 1 pass through the field of view control device 3. Here, the field of view control device 3 may be provided on the light incident side of the flat lens 1, may be provided on the light emitting side of the display 2, or the field of view control device 3 may be provided on both the light incident side of the flat lens 1 and the light incident side of the display 2. For example, when the field of view control device 3 is provided on the light incident side of the flat lens 1, after the display 2 emits light toward the flat lens 1, the light rays pass through the field of view control device 3 and then pass through the flat lens 1, and by controlling the field of view control device 3, the size of the field of view angle of the optical imaging system 100 can be adjusted.

[0012] Furthermore, FIGS. 1 - 10 show the basic structure and imaging principle of the flat lens 1.

[0013] On the central normal line L1 of the flat lens 1, the opposite sides of the flat lens 1 are respectively the image source side and the viewing side. That is, the light source of the image P1 is on the image source side, the image P1 passes through the flat lens 1, and a floating real image P2 can be formed on the viewing side. The floating real image P2 is a real image floating in the air. Here, as shown in FIGS. 1 - 3, the flat lens 1 is an optical structure that utilizes two layers of periodically distributed orthogonal optical waveguide arrays 10 to totally reflect light once in each of the two layers of optical waveguide arrays 10. Since the two layers of optical waveguide arrays 10 have a rectangular structure orthogonal to each other, the incident angle at the first total reflection is the same as the exit angle at the second total reflection. The light rays within the divergence angle of the light source rays converge to the viewing side accordingly after passing through the flat lens 1, and a 1:1 floating real image P2 is obtained.

[0014] Referring to FIGS. 1 - 3, the flat lens 1 includes two sets of optical waveguide arrays 10. Each set of optical waveguide arrays 10 is composed of a plurality of rows of sub - waveguides 101 in a single column, and the cross - section of each sub - waveguide 101 is rectangular. Here, the cross - section of the sub - waveguide 101 refers to the cross - section in the direction perpendicular to the longitudinal direction of the sub - waveguide 101.

[0015] Referring to FIGS. 2 - 4, the two sets of optical waveguide arrays 10 include a first optical waveguide array 11 and a second optical waveguide array 12. The sub - waveguides 101 of the first optical waveguide array 11 extend along the X - direction and are formed in a plurality of rows along the Y - direction. The sub - waveguides 101 of the second optical waveguide array 12 extend along the Y - direction and are formed in a plurality of rows along the X - direction. The first optical waveguide array 11 and the second optical waveguide array 12 are distributed along the Z - direction, and the X - direction, Y - direction, and Z - direction are perpendicular to each other in pairs. Here, the extending direction of the sub - waveguide 101 is the longitudinal direction of the sub - waveguide 101. The longitudinal direction of a single sub - waveguide 101 of the first optical waveguide array 11 is the X - direction, and the plurality of sub - waveguides 101 of the first optical waveguide array 11 are distributed so as to be in close contact and overlap along the Y - direction. The width direction of a single sub - waveguide 101 is the Y - direction. The longitudinal direction of a single sub - waveguide 101 of the second optical waveguide array 12 is the Y - direction, and the plurality of sub - waveguides 101 of the second optical waveguide array 12 are distributed so as to be in close contact and overlap along the X - direction. The width direction of a single sub - waveguide 101 is the X - direction. The two sets of optical waveguide arrays 10 are each flat - plate - shaped, and the distribution direction from the first optical waveguide array 11 to the second optical waveguide array 12 is the Z - direction, and the Z - direction is also the thickness direction of the flat lens 1.

[0016] Each sub-waveguide 101 is provided with reflection films on two side surfaces in the width direction for total reflection of light rays respectively. For example, for the sub-waveguide 101 of the first optical waveguide array 11, reflection films are provided on two side surfaces in its Y direction respectively. Since the first optical waveguide array 11 includes a plurality of sub-waveguides 101, a plurality of reflection films are distributed along the Y direction. For the sub-waveguide 101 of the second optical waveguide array 12, reflection films are provided on two side surfaces in its X direction respectively. Since the second optical waveguide array 12 includes a plurality of sub-waveguides 101, a plurality of reflection films are distributed along the X direction.

[0017] As shown in FIGS. 1 and 3, the flat lens 1 may include a protective plate cover 30 for supporting and protecting the optical waveguide array 10. The protective plate cover 30 may be provided on one side of the flat lens 1, or protective plate covers 30 may be provided on both sides of the flat lens 1. Specifically, the protective plate cover 30 is a transparent plate cover, and optionally, the protective plate cover 30 is a glass plate.

[0018] As shown in FIG. 4, the outer contour shape of the formed optical waveguide array 10 is rectangular, and the angle between the extending direction of each sub-waveguide 101 and at least two sides of the outer contour of the optical waveguide array 10 is θ. Optionally, θ satisfies 30° ≤ θ ≤ 60°, preferably, θ = 45°. At this angle, the floating real image P2 is clear and the afterimage is not obvious.

[0019] The specific imaging principle is as follows. Here, the two optical waveguide arrays 10 are disassembled. As shown in FIGS. 6 and 7, taking the first optical waveguide array 11 as an example. In the single-layer optical waveguide array 10, a single point light ray on the image source side passes through the optical waveguide array 10 on one side, and then is divided by the sub-waveguides 101 in each row for mirror modulation, and then converges to a straight line P1' parallel to the X direction, forming a point-to-line one-dimensional imaging effect. In FIG. 6, the incident angle at which a single point light ray on the image source side passes through a certain sub-waveguide 101 is δ, and after being reflected by the sub-waveguide 101, its exit angle is δ', and the incident angle δ is equal to the exit angle δ'.

[0020] As shown in FIG. 8, in order to make two directions (X direction, Y direction) intersect at one point, it is necessary to use two sets of optical waveguide arrays 10 so that the distribution directions of the two-layer sub-waveguides 101 are perpendicular to each other, and the target light source image P1 can be modulated point-to-point. For this reason, it is possible to realize that light rays in any direction passing through these two mutually perpendicular two-layer optical waveguide arrays 10 converge again to the floating real image P2 at the symmetric position of the optical waveguide array 10. The imaging distance m2 of the floating real image P2 is the same as the distance m1 to the original image, which is equidistant imaging, and the position of the floating real image P2 is in the air, without the need for a carrier such as a screen projection, and the real image can be directly displayed in the air.

[0021] Therefore, such a flat lens 1 can image a two-dimensional or three-dimensional light source in the air and can realize a true hologram image. While realizing a large field of view, a large aperture, high resolution, no distortion, and no dispersion, the naked-eye three-dimensional display characteristics are realized.

[0022] FIG. 9a is a schematic diagram when light rays are normally incident and obliquely incident on the flat lens 1. The light ray path when normally incident is shown in FIG. 9b, and the light ray path when obliquely incident is shown in FIG. 10. As shown in FIG. 9b, when the viewing angle is 0°, the light ray is normally incident, and the afterimage is due to the light ray being reflected an odd number of times by the flat lens 1. The solid line in FIG. 9b is the light ray that is reflected twice to generate the floating real image P2, and FIG. 10 is the light ray that is reflected once by the broken line to generate the afterimage.

[0023] As shown in FIG. 11, the field of view control device 3 applied to the optical imaging system 100 according to the embodiment of the present application includes a base body 302 and a plurality of light-shielding portions 303. The light-shielding portions 303 are configured as light-impermeable structures. The base body 302 has light transmissibility. The plurality of light-shielding portions 303 can all be provided within the base body 302 and the plurality of light-shielding portions 303 are parallel to each other. Further, the plurality of light-shielding portions 303 can be sequentially provided along a first direction of the base body 302. The first direction is the left-right direction in FIG. 11. A light-transmitting region is formed between at least two adjacent light-shielding portions 303 among the plurality of light-shielding portions 303 with an interval therebetween. Here, the field of view control device 3 can be provided as an active device or a passive device. The material of the base body 302 may be a light-transmitting material such as, for example, optical quartz glass, ultraviolet-transmitting black glass, soda-lime silicon short-wave ultraviolet glass, soda-lime ultraviolet glass, light-transmitting plastic, etc., but the present application is not limited thereto as long as the light transmissibility of the base body 302 is ensured. The light-shielding portion 303 can play a role of blocking light. The light-shielding portion 303 may be an opaque material. Specifically, the light-shielding portion 303 may be a black light-absorbing material that absorbs light, or a high-haze material that has high light scattering property with respect to light, but the present application is not limited thereto. The manufacturing material of the light-shielding portion 303 only needs to ensure its good light-shielding property.

[0024] Furthermore, the shape of the light-shielding portion 303 can be designed according to the usage needs. For example, the longitudinal section of the light-shielding portion 303 can be set as various polygons such as a rectangle, a trapezoid, a triangle, etc. The light-shielding portion 303 with a trapezoidal longitudinal section can limit the size of the viewing angle of the optical imaging system 100 more than the light-shielding portion 303 with a rectangular longitudinal section. At least two adjacent light-shielding portions 303 among the plurality of light-shielding portions 303 are adjacent with a gap therebetween to form a light transmission region between the two adjacent light-shielding portions 303. Preferably, all of the plurality of light-shielding portions 303 are sequentially spaced apart, and the spacing distances of the plurality of light-shielding portions 303 are the same. In some other embodiments of the present application, the plurality of light-shielding portions 303 can be divided into a plurality of groups. Two or three light-shielding portions 303 are taken as one group. The plurality of groups of light-shielding portions 303 are adjacent with a gap therebetween to form a light transmission region between two adjacent groups of light-shielding portions 303, and the spacing distances of the plurality of groups of light-shielding portions 303 are the same. When light rays are incident on the viewing angle control device 3, if the light rays incident on the viewing angle control device 3 deviate from a predetermined path by a certain angle or more, the deviated light rays are absorbed or scattered by the light-shielding portion 303, whereby the size of the viewing angle of the optical imaging system 100 can be reduced. The size of the viewing angle can be controlled by adjusting the size of the spacing between the plurality of light-shielding portions 303 or the plurality of groups of light-shielding portions 303 and the thickness of the light-shielding portion 303. For example, the smaller the size of the spacing between the plurality of light-shielding portions 303 or the plurality of groups of light-shielding portions 303, the more light rays are blocked, the smaller the emission angle of the light rays, the smaller the viewing angle of the optical imaging system 100, the larger the thickness of the light-shielding portion 303, the more light rays are blocked, the smaller the emission angle of the light rays, and the smaller the viewing angle of the optical imaging system 100.

[0025] Thereby, by combining the substrate 302 and the plurality of light-shielding portions 303, the size of the viewing angle of the optical imaging system 100 can be reduced, the generation of afterimages on both sides of the floating real image in the optical imaging system 100 can be suppressed, and the viewing experience of the user can be improved.

[0026] In some embodiments of the present application, as shown in FIGS. 11-18, a plurality of mounting portions for mounting the light-shielding portion 303 in the base 302 can be provided, and the plurality of light-shielding portions 303 are respectively provided corresponding to the plurality of mounting portions. The plurality of light-shielding portions 303 are provided in the base 302 by the plurality of mounting portions, one light-shielding portion 303 is mounted on one mounting portion, and the light-shielding portion 303 and the mounting portion can be connected by adhesion. For example, the light-shielding portion 303 and the mounting portion are adhered with an adhesive, but the present application is not limited thereto, and it may also be interpreted that the light-shielding portion 303 and the mounting portion can be connected by a fitting connection. For example, an engaging protrusion is provided on the light-shielding portion 303, an engaging groove is provided on the mounting portion, and the light-shielding portion 303 and the mounting portion are fitted and connected by aligning the engaging protrusion with the engaging groove. By such installation, the connection stability between the base 302 and the light-shielding portion 303 can be improved.

[0027] In some embodiments of the present application, as shown in FIGS. 11-18, the mounting portion can be configured as a mounting groove, the mounting groove is provided to extend in the thickness direction of the base 302 (the up-down direction in FIG. 13), and further, the mounting groove can penetrate the base 302 in the thickness direction of the base 302. Note that the plurality of light-shielding portions 303 are provided in the plurality of mounting grooves, and the shape of the mounting groove corresponds to the shape of the light-shielding portion 303. By such installation, the connection stability between the base 302 and the light-shielding portion 303 can be improved.

[0028] In some embodiments of the present application, as shown in FIGS. 11-18, in the thickness direction of the base 302, the light-shielding portion 303 can be perpendicular to the base 302. By setting the light-shielding portion 303 perpendicular to the base 302, the emission angle of the light rays can be made smaller, the viewing angle of the optical imaging system 100 can be made smaller, the generation of afterimages on both sides of the floating real image in the optical imaging system 100 can be suppressed, and the viewing experience of the user can be improved.

[0029] In some embodiments of the present application, in the thickness direction of the substrate 302, the light-shielding portion 303 can be set to extend obliquely. It should be noted that the oblique extension directions of the plurality of light-shielding portions 303 are the same. For example, all of the plurality of light-shielding portions 303 extend to the upper left of the substrate 302, or all extend to the upper right of the substrate 302. By such an arrangement, the light-shielding portion 303 can block light rays in different directions, and the application range of the vision control device 3 can be expanded.

[0030] In some embodiments of the present application, as shown in FIGS. 11-18, the vision control device 3 may include a first protective sheet 301 and a second protective sheet 304. In the thickness direction of the substrate 302, the substrate 302 has a first surface and a second surface facing each other. The first protective sheet 301 and the second protective sheet 304 may be provided on the first surface and the second surface respectively. Here, both the first protective sheet 301 and the second protective sheet 304 have light transmissibility. It should be noted that the first protective sheet 301 and the second protective sheet 304 can play a role in protecting the substrate 302 and the light-shielding portion 303. The first protective sheet 301 and the second protective sheet 304 may be connected to the substrate 302 by adhesion, or may be connected to the substrate 302 by screwing, so as to realize a detachable connection between the first protective sheet 301, the second protective sheet 304 and the substrate 302. By such an arrangement, the first protective sheet 301 and the second protective sheet 304 can protect the substrate 302 and the light-shielding portion 303, and can also improve the stability of the overall structure of the vision control device 3, so that the relative positions of the substrate 302 and the light-shielding portion 303 do not change.

[0031] In some other embodiments of the present application, as shown in FIGS. 11-13, the vision control device 3 may include a backlight 306, and the backlight 306 may selectively irradiate the light-shielding portion 303 so as to switch the light-shielding portion 303 between a light-shielded state and a non-light-shielded state. At this time, the material of the light-shielding portion 303 may be a mixture of a photochromic material and a transparent substance, the transparent substance may be a resin, the wavelength at which the backlight 306 emits light is different from the wavelength of the light emitted by the display 2 in the optical imaging system 100, and the light emitted from the backlight 306 may be short-wavelength light of 400 nm or less. When the light-shielding portion 303 is irradiated by the backlight 306, the photochromic material can change from a transparent state to an opaque state. At this time, the light-shielding portion 303 is in a light-shielded state, the viewing angle of the optical imaging system 100 is the smallest, and the optical imaging system 100 is in a narrow viewing angle mode. The state change of the photochromic material is a reversible reaction. After the backlight 306 stops irradiating, the photochromic material also changes from an opaque state to a transparent state. At this time, the light-shielding portion 303 is in a non-light-shielded state, the viewing angle of the optical imaging system 100 is the largest, and the optical imaging system 100 is in a wide viewing angle mode. Alternatively, when the light-shielding portion 303 is irradiated by the backlight 306, the photochromic material can change from an opaque state to a transparent state. After the backlight 306 stops irradiating, the photochromic material also changes from a transparent state to an opaque state, and the light-shielding portion 303 can be switched between a light-shielded state and a non-light-shielded state. With such an arrangement, the size of the viewing angle of the optical imaging system 100 can be adjusted by changing the light-shielded state of the light-shielding portion 303, and the practicality of the vision control device 3 can be improved.

[0032] In some embodiments of the present application, as shown in FIGS. 11-13, the vision control device 3 may include a light guide plate 305, and the light guide plate 305 can be used to guide the light rays from the backlight 306 to the light shielding portion 303. Note that the backlight 306 may be provided on the outer side in the radial direction of the light guide plate 305. When the backlight 306 emits light rays, the light guide plate 305 guides the light rays from the backlight 306 to the light shielding portion 303, thereby changing the light shielding state of the light shielding portion 303. With such an arrangement, it is possible to avoid the occurrence of a situation where the floating virtual image is incomplete due to the backlight 306 blocking the light rays emitted from the optical imaging system 100.

[0033] In some embodiments of the present application, as shown in FIGS. 14-16, at least one light shielding portion 303 may include a first light shielding portion 308 and a second light shielding portion 309, and the first light shielding portion 308 and the second light shielding portion 309 can be provided by being laminated along the thickness direction of the base body 302. Further, each light shielding portion 303 includes both the first light shielding portion 308 and the second light shielding portion 309. The backlight 306 may include a first backlight 3061 and a second backlight 3062. The first backlight 3061 can be used to selectively irradiate the first light shielding portion 308, and the second backlight 3062 can be used to selectively irradiate the second light shielding portion 309. Note that both the first light shielding portion 308 and the second light shielding portion 309 can be rectangular. The material of the first light shielding portion 308 may include a first photochromic material. When the first photochromic material is irradiated by the first backlight 3061, the first photochromic material can change from a transparent state to an opaque state. After the first backlight 3061 stops irradiating, the first photochromic material also changes from an opaque state to a transparent state. The material of the second light shielding portion 309 may include a second photochromic material. When the second photochromic material is irradiated by the second backlight 3062, the second photochromic material can change from a transparent state to an opaque state. After the second backlight 3062 stops irradiating, the second photochromic material also changes from an opaque state to a transparent state.

[0034] Furthermore, the light beam emitted from the first backlight 3061 may be a short-wavelength light beam with a wavelength of 400 nm or less, and the wavelength of the light beam emitted from the second backlight 3062 is smaller than the wavelength of the light beam emitted from the first backlight 3061. As shown in FIG. 16, when both the first backlight 3061 and the second backlight 3062 are in the off state, both the first light-shielding portion 308 and the second light-shielding portion 309 are in the non-light-shielding state. At this time, the viewing angle of the optical imaging system 100 is the largest, and the optical imaging system 100 is in the wide viewing angle mode. As shown in FIG. 17, when the first backlight 3061 is off and the second backlight 3062 is on, the first light-shielding portion 308 is in the non-light-shielding state, and the second light-shielding portion 309 is in the light-shielding state. At this time, the viewing angle of the optical imaging system 100 is appropriate, and the optical imaging system 100 is in the medium viewing angle mode. As shown in FIG. 18, when both the first backlight 3061 and the second backlight 3062 are in the on state, both the first light-shielding portion 308 and the second light-shielding portion 309 are in the light-shielding state. At this time, the viewing angle of the optical imaging system 100 is the smallest, and the optical imaging system 100 is in the narrow viewing angle mode. Thus, by controlling the lighting or extinguishing of the first backlight 3061 and the second backlight 3062, the size of the viewing angle of the optical imaging system 100 can be freely selected, and the free switching among the above three viewing angle modes can be realized.

[0035] In some other embodiments of the present application, when the first photochromic material is irradiated by the first backlight 3061, the first photochromic material can change from a transparent state to an opaque state, and after the first backlight 3061 stops irradiating, the first photochromic material also changes from the opaque state to the transparent state. When the second photochromic material is irradiated by the second backlight 3062, the second photochromic material can change from an opaque state to a transparent state, and after the second backlight 3062 stops irradiating, the second photochromic material also changes from the transparent state to the opaque state. Further, the light rays emitted from the first backlight 3061 may be short-wavelength light rays with a wavelength of 400 nm or less, and the wavelength of the light rays emitted from the second backlight 3062 is smaller than the wavelength of the light rays emitted from the first backlight 3061.

[0036] When both the first backlight 3061 and the second backlight 3062 are in the off state, the first light-shielding portion 308 is in the non-light-shielding state, and the second light-shielding portion 309 is in the light-shielding state. Or, when both the first backlight 3061 and the second backlight 3062 are in the on state, the first light-shielding portion 308 is in the light-shielding state, and the second light-shielding portion 309 is in the non-light-shielding state. At this time, the viewing angle of the optical imaging system 100 is appropriate, and the optical imaging system 100 is in the medium viewing angle mode. When the first backlight 3061 is off and the second backlight 3062 is on, both the first light-shielding portion 308 and the second light-shielding portion 309 are in the non-light-shielding state. At this time, the viewing angle of the optical imaging system 100 is the largest, and the optical imaging system 100 is in the wide viewing angle mode. When the first backlight 3061 is on and the second backlight 3062 is off, both the first light-shielding portion 308 and the second light-shielding portion 309 are in the light-shielding state. At this time, the viewing angle of the optical imaging system 100 is the smallest, and the optical imaging system 100 is in the narrow viewing angle mode. In this way, by controlling the lighting or extinguishing of the first backlight 3061 and the second backlight 3062, the size of the viewing angle of the optical imaging system 100 can be freely selected, and the free switching among the above three viewing angle modes can be realized.

[0037] The first backlight 3061 and the second backlight 3062 may be provided on the radially outer side of the light guide plate 305. Further, in the path of the optical path for emitting light rays from the backlight, the light guide plate 305 may be provided on the upstream side of the base body 302, and the first backlight 3061 and the second backlight 3062 may be provided on the radially outer side of the light guide plate 305. When the first backlight 3061 and the second backlight 3062 emit light rays, the light guide plate 305 guides the light rays from the first backlight 3061 and the second backlight 3062 to the first light-shielding portion 308 and the second light-shielding portion 309 respectively, thereby changing the light-shielding states of the first light-shielding portion 308 and the second light-shielding portion 309. By such an installation, it is possible to avoid the occurrence of a situation where the floating virtual image is incomplete due to the backlight 306 blocking the light rays emitted from the optical imaging system 100.

[0038] In one embodiment of the present application, as shown in FIG. 20, the field-of-view control device 3 may be provided on the surface of the flat lens 1 of the display 2 close to the flat lens 1. The surface of the flat lens 1 of the display 2 close to the flat lens 1 is the light-emitting side of the display 2, and the field-of-view control device 3 is in close contact with the display 2. The field-of-view control device 3 can be one of the above-mentioned field-of-view control devices. The emission angle at which the display 2 emits light rays is controlled by the field-of-view control device 3 and then enters the flat lens 1, converges in the air and forms an image. α is the magnitude of the actual horizontal field-of-view angle of the floating virtual image.

[0039] In some embodiments of the present application, as shown in FIGS. 21-22, the field of view control device 3 may be provided on the surface of the flat lens 1 that is far from and / or close to the display 2. In one embodiment of the present application, as shown in FIG. 21, the field of view control device 3 may be provided on the surface of the flat lens 1 that is far from the display 2. The surface of the flat lens 1 that is far from the display 2 is the light-emitting side of the flat lens 1. The field of view control device 3 is in close contact with the display 2. The field of view control device 3 can be one of the above-mentioned field of view control devices. The distribution direction of the light-shielding portion 303 of the field of view control device 3 is the left-right direction in FIG. 23. After the light rays of the display 2 are incident on the flat lens 1, the field of view control device 3 controls the emission angle of the light rays, so that they converge in the air for imaging. α is the size of the actual horizontal field of view angle of the floating real image, and the size of the horizontal field of view angle that decreases after adding the field of view control device 3 is 2β.

[0040] In other embodiments of the present application, as shown in FIG. 22, the field of view control device 3 may be provided on the surface of the flat lens 1 that is close to the display 2. The surface of the flat lens 1 that is close to the display 2 is the light-incident side of the flat lens 1. The field of view control device 3 is in close contact with the display 2. The field of view control device 3 can be one of the above-mentioned field of view control devices. The distribution direction of the light-shielding portion 303 of the field of view control device 3 is the left-right direction in FIG. 24. The light rays of the display 2 are controlled by the field of view control device 3 to control the emission angle of the light rays. After being incident on the flat lens 1, they converge in the air for imaging. α is the size of the actual horizontal field of view angle of the floating real image, and the size of the horizontal field of view angle that decreases after adding the field of view control device 3 is 2β.

[0041] In some embodiments of the present application, as shown in FIG. 23, there may be an angle between the display 2 and the flat lens 1. As shown in FIG. 24, the field of view control device 3 may be provided on the surface of the flat lens 1 of the display 2 that is close. The field of view control device 3 is in close contact with the display 2. The field of view control device 3 can be one of the above-mentioned field of view control devices. It is adhered to the display 2, and the field of view control device 3 and the display 2 are provided obliquely with respect to the flat lens 1. The emission angle of the light rays emitted from the display 2 is controlled by the field of view control device 3 and then enters the flat lens 1, converges in the air for imaging, and γ is the magnitude of the actual vertical field of view angle of the floating real image.

[0042] In other embodiments of the present application, as shown in FIG. 25, the field of view control device 3 may be provided on the surface of the flat lens 1 that is far from the display 2. The surface of the flat lens 1 of the display 2 that is far is the light incident side of the display 2. The field of view control device 3 is in close contact with the flat lens 1. The field of view control device 3 can be one of the above-mentioned field of view control devices. The display 2 is provided obliquely with respect to the field of view control device 3 and the flat lens 1. After the light rays emitted from the display 2 enter the flat lens 1, by controlling the emission angle of the light rays by the field of view control device 3, they converge in the air for imaging, and γ is the magnitude of the actual vertical field of view angle of the floating real image. In order to block the light rays that the display 2 vertically enters the flat lens 1 and achieve the anti-peeping effect, preferably, the cross-section of the light-shielding portion 303 may be provided as a parallelogram. At the same time, the field of view control device 3 can completely block the light rays that are not reflected by the optical waveguide in the flat lens 1 and directly transmitted, so that the observer cannot observe the image by directly observing the display 2 behind the floating real image, and can only observe the image through the floating real image. The floating real image has a small field of view angle, and a good anti-peeping effect can be obtained.

[0043] In other embodiments of the present application, as shown in FIG. 26, the vision control device 3 may be provided on the surface of the flat lens 1 close to the display 2. The vision control device 3 is in close contact with the flat lens 1, and the vision control device 3 can be one of the above vision control devices. The display 2 is provided obliquely with respect to the vision control device 3 and the flat lens 1. After the light rays emitted from the display 2 enter the flat lens 1, the emission angle of the light rays is controlled by the vision control device 3, so that they converge and image in the air. γ is the magnitude of the actual vertical viewing angle of the floating real image. Preferably, the cross-section of the light-shielding portion 303 may be provided as a parallelogram. With such an installation, the display 2 can effectively block the light rays vertically incident on the flat lens 1.

[0044] In the description of this specification, the description of reference terms such as "one embodiment", "several embodiments", "schematic embodiment", "example", "specific example", or "several examples" means that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the general narrative of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials, or characteristics described can be combined in a suitable form in any one or more embodiments or examples.

[0045] Although the embodiments of the present application have been shown and described, those skilled in the art can make various changes, modifications, substitutions, and deformations to these embodiments without departing from the principle and spirit of the present application. It can be understood that the scope of the present application is limited by the claims and their equivalents.

[0046] This application is proposed based on a Chinese patent application with an application number of 202210173698.1 and a filing date of February 24, 2022, claims the priority of the above Chinese patent application, and the entire content of the above Chinese patent application is incorporated herein by reference.

Claims

Claim 1 A field of view control device applicable to an optical imaging system, comprising: a substrate capable of transmitting light; a plurality of light-shielding portions provided on the substrate and parallel to each other, and sequentially provided in a first direction of the substrate, wherein at least two adjacent light-shielding portions among the plurality of light-shielding portions are spaced apart to form a light-transmitting region between the two adjacent light-shielding portions; a backlight for selectively irradiating the light-shielding portions so as to switch the light-shielding portions between a light-shielding state and a non-light-shielding state; at least one of the light-shielding portions includes a first light-shielding portion and a second light-shielding portion, the first light-shielding portion and the second light-shielding portion are provided in a stacked manner in the thickness direction of the substrate, the backlight includes a first backlight and a second backlight, the first backlight is used for selectively irradiating the first light-shielding portion, and the second backlight is used for selectively irradiating the second light-shielding portion; a light guide plate for guiding light rays from the backlight to the corresponding light-shielding portions, wherein the first backlight and the second backlight are provided outside the radial direction of the light guide plate, and the field of view control device applicable to an optical imaging system. Claim 2 A field of view control device applicable to the optical imaging system according to claim 1, wherein a plurality of mounting portions for mounting the light-shielding portions are provided in the substrate, and the plurality of light-shielding portions respectively correspond to the plurality of mounting portions. Claim 3 A field of view control device applicable to the optical imaging system according to claim 2, wherein the mounting portion is configured as a mounting groove, and the mounting groove extends in the thickness direction of the substrate. Claim 4 A field of view control device applicable to the optical imaging system according to claim 2 or 3, wherein in the thickness direction of the substrate, the light-shielding portion is perpendicular to the substrate. Claim 5 A field of view control device applicable to the optical imaging system according to claim 2, wherein in the thickness direction of the substrate, the light-shielding portion extends obliquely. Claim 6 It further includes a first protective sheet and a second protective sheet. In the thickness direction of the substrate, the substrate has a first surface and a second surface facing each other. The first protective sheet and the second protective sheet are respectively provided on the first surface and the second surface, and both the first protective sheet and the second protective sheet can transmit light. A field-of-view control device applicable to the optical imaging system according to any one of claims 1-3.

7. An optical imaging system, comprising: a flat lens; a display for emitting light rays toward the flat lens; a field-of-view control device, wherein the field-of-view control device is provided on the flat lens and / or the display, and the light rays emitted by the display toward the flat lens pass through the field-of-view control device. The field-of-view control device is a field-of-view control device applicable to the optical imaging system according to any one of claims 1-3. An optical imaging system comprising the above.

8. The optical imaging system according to claim 7, wherein the field-of-view control device is provided on a surface of the flat lens that is far from and / or close to the display.

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