CN217467355U - Holographic near-to-eye display system and head-mounted display equipment - Google Patents
Holographic near-to-eye display system and head-mounted display equipment Download PDFInfo
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Abstract
The utility model provides a nearly eye display system of holographic formula and head-mounted display device, wherein, this nearly eye display system of holographic formula includes: the device comprises a light source, a collimating super lens, an angle modulator, a spatial light modulator and a projection lens; the collimating super lens is arranged on the light-emitting side of the light source, and is used for collimating the light beam emitted by the light source and emitting a collimated light beam; the angle modulator is a phase-adjustable superlens, is arranged on the light-emitting side of the collimating superlens, changes the deflection angle of the collimated light beam and emits a modulated light beam; the spatial light modulator is arranged on the light-emitting side of the angle modulator and generates an imaging light beam for displaying an image; the projection lens is arranged on the light-emitting side of the spatial light modulator and focuses an imaging light beam of a display image. Through the embodiment of the utility model provides a holographic formula near-to-eye display system and head-mounted display device adopt the super lens of collimation and the angle modulation ware of super lens formula, can not only enlarge the eye movement scope, still possessed whole thickness and thin and the high advantage of productivity, more accorded with the market demand.
Description
Technical Field
The utility model relates to a super lens's application particularly, relates to a nearly eye display system of holographic formula and head-mounted display device.
Background
In the conventional holographic near-eye display technology, the eye movement range (such as a field of view range without vignetting and aberration) is related to the interpupillary distance of human eyes, and the larger the eye movement range is, the larger the interpupillary distance accommodation degree of different human eyes is, so that the eye movement range is a crucial parameter of a near-eye display system.
Currently, pupil scanning (e.g., tracking the gaze direction of the human eye by an eye tracking camera, changing the focus of the image generated by the display by turning the light beam, matching the gaze direction of the human eye) can be used to expand the eye movement range. However, in the case of a change in the pupil position, the optical elements involved in the near-eye display system using this method are complicated in structure, high in cost, and large in size, if a clear three-dimensional image is to be seen, and thus, the near-eye display system is not suitable for a product-level near-eye display optical system.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the embodiments of the present invention is to provide a holographic near-to-eye display system and a head-mounted display device.
In a first aspect, an embodiment of the present invention provides a holographic near-to-eye display system, including: the collimating super lens is arranged on the light emitting side of the light source and is used for collimating the light beam emitted by the light source and emitting a collimated light beam; the angle modulator is a phase-adjustable superlens, is arranged on the light-emitting side of the collimating superlens, and is used for changing the deflection angle of the collimated light beam and emitting a modulated light beam; the spatial light modulator is arranged on the light emergent side of the angle modulator and used for generating an imaging light beam for displaying an image; the projection lens is arranged on the light-emitting side of the spatial light modulator and used for focusing the imaging light beam of the display image.
Optionally, the holographic near-eye display system further comprises: an eye tracking system; the eye tracking system is used for determining a fixation point of a human eye on the spatial light modulator; the human eye is at the fixation point of the spatial light modulator and is also the position where the modulated light beam emitted by the angle modulator is emitted into the spatial light modulator.
Optionally, the angle modulator comprises: the phase change material comprises a substrate, a nano structure, a phase change material layer, a first electrode layer and a second electrode layer; a plurality of nanostructures are arranged on one side of the substrate, the first electrode layer is filled around the nanostructures, and the height of the first electrode layer is lower than that of the nanostructures; the phase change material layer is arranged on one side, far away from the substrate, of the first electrode layer and is filled around the nano structure, and the sum of the heights of the first electrode layer and the phase change material layer is larger than or equal to the height of the nano structure; the second electrode layer is arranged on one side, far away from the substrate, of the phase change material layer; the first electrode layer and the second electrode layer are used for loading voltage to the phase change material layer, and the phase change material layer can change the phase of the angle modulator according to the loaded voltage.
Optionally, the phase change material used in the phase change material layer is germanium antimony tellurium.
Optionally, the first electrode layer and the second electrode layer are indium tin oxide.
Optionally, the phase change material layer, the first electrode layer, and the second electrode layer are transparent or semitransparent materials in an operating band, and an absolute value of a difference between a refractive index of the nanostructure and a refractive index of the phase change material layer, the first electrode layer, or the second electrode layer is greater than or equal to 0.5.
Optionally, the operating band of the angle modulator is a visible band.
Optionally, the projection lens comprises: a superlens.
Optionally, the spatial light modulator comprises: spatial light modulators based on super-surfaces.
Optionally, the holographic near-eye display system further comprises: a beam deflecting element; the beam deflection element is arranged between the spatial light modulator and the projection lens, or the beam deflection element is arranged on the light emergent side of the projection lens; the beam deflection element is used for changing the optical path direction of the imaging beam.
In a second aspect, the embodiments of the present invention further provide a head-mounted display device, including: any of the above support housings is used to secure the holographic near-to-eye display system.
Optionally, the head-mounted display device further comprises: and the fixing band is used for being connected with the supporting shell and forming an annular structure which can be worn on the head of a user.
The embodiment of the utility model provides an in the above-mentioned scheme that the first aspect provided, adopt the super lens of collimation and the angle modulation ware of super lens formula, can not only enlarge eye movement scope, compare in the nearly eye display system of holographic formula that uses traditional lens, this nearly eye display system of holographic formula still possesses the advantage that the quality is light, whole thickness is thin, the system is simple, the price is lower and the productivity is high, more accords with the market demand. The embodiment of the utility model provides an in the scheme that above-mentioned second aspect provided, adopt the nearly eye display system of thin holographic formula more, can make whole head-mounted display device's structure more frivolous compact, it is higher to wear the comfort level.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a holographic near-eye display system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a projection lens including a superlens in a holographic near-eye display system provided by an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, further including an eye tracking system;
fig. 4 is a schematic structural diagram of an angle modulator in a holographic near-eye display system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a holographic near-eye display system provided by an embodiment of the present invention, which does not include an eye tracking system and the angle modulator is a superlens that changes phase by applying a voltage;
fig. 6 is a schematic diagram of a holographic near-eye display system provided by an embodiment of the present invention, including an eye tracking system and an angle modulator as a superlens that changes phase by applying a voltage;
fig. 7 is a schematic diagram illustrating a beam deflection element between a spatial light modulator and a projection lens in a holographic near-to-eye display system provided by an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a holographic near-eye display system according to an embodiment of the present invention, further including a beam deflecting element on the light-emitting side of the projection lens;
fig. 9 shows a schematic diagram of a head-mounted display device provided by an embodiment of the present invention.
Icon:
1-holographic near-to-eye display system, 2-supporting shell, 3-fixing band, 11-light source, 12-collimating super lens, 13-angle modulator, 14-spatial light modulator, 15-projection lens, 16-eye movement tracking system, 17-beam deflection element, 131-substrate, 132-nanostructure, 133-phase change material layer, 134-first electrode layer and 135-second electrode layer.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The embodiment of the utility model provides a holographic near-to-eye display system, it is shown with reference to fig. 1, this holographic near-to-eye display system includes: a light source 11, a collimating metalens 12, an angle modulator 13, a spatial light modulator 14 and a projection lens 15; the right side of the light source 11 is shown as its light exit side in fig. 1.
As shown in fig. 1, the collimating metalens 12 is disposed on the light emitting side of the light source 11, and is used for collimating the light beam emitted by the light source 11 and emitting the collimated light beam; the angle modulator 13 is a phase-adjustable superlens, is arranged on the light-emitting side of the collimating superlens 12, and is used for changing the deflection angle of the collimated light beam and emitting a modulated light beam; a spatial light modulator 14 is provided on the light exit side of the angle modulator 13 for generating an imaging light beam for displaying an image; a projection lens 15 is arranged on the light exit side of the spatial light modulator 14 for focusing the imaging light beam of the display image.
In the holographic near-to-eye display system provided by the embodiment of the present invention, the light source 11 may include a light emitting diode light source and a narrow band filter, or the light source 11 may also include a fiber coupled laser for emitting a light beam to the collimating superlens 12 disposed on the light emitting side of the light source 11 (e.g., the right side of the light source 11 in fig. 1); the collimating metalens 12 collimates the light beam emitted from the light source 11 and emits the collimated light beam. In the embodiment of the present invention, the collimating metalens 12 emits the emitted collimated light beam to the angle modulator 13 located on the light-emitting side thereof, wherein the angle modulator 13 is a phase-adjustable metalens, and the deflection angle (the included angle between the collimated light beam and the normal line, the incident angle) of the incident collimated light beam can be changed by changing the phase of the angle modulator 13, so as to emit the modulated light beam. For example, by changing the phase of the angle modulator 13, the incident angle θ can be made i The collimated light beam incident on the angle modulator 13 is modulated by the angle modulator 13 to have an exit angle θ o The emitted modulated light beam has an incident angle theta i Angle of departure theta o The sizes are different.
In the embodiment of the present invention, the modulated light beam can be incident into the spatial light modulator 14 located at the light-emitting side of the angle modulator 13, and the spatial light modulator 14 is a device capable of loading information (e.g. depth information) on one-dimensional or two-dimensional optical data field so as to effectively utilize the intrinsic speed, parallelism and interconnection capability of the light. In the embodiment of the present invention, the spatial light modulator 14 can perform wavefront modulation (e.g. calculating and loading the display image with depth information) on the modulation light beam incident thereto, and emit an imaging light beam, so that the emitted imaging light beam can generate the display image with depth information, such as a three-dimensional stereo image, on the side of the spatial light modulator 14 away from the angle modulator 13. Wherein the spatial light modulator 14 may comprise a liquid crystal spatial light modulator, optionally, the spatial light modulator 14 comprises: spatial light modulators based on super-surfaces. The embodiment of the utility model provides a choose for use based on spatial light modulator 14 of super surface, can make the nearly eye display system of holographic formula based on this spatial light modulator 14 more slim, simple structure.
Here, a projection lens 15 is provided on the light exit side of the spatial light modulator 14, and the projection lens 15 is a lens that can realize a focusing function, and for example, the projection lens 15 can converge an imaging light flux of a display image emitted from the spatial light modulator 14 to a pupil. Wherein, referring to fig. 1, the projection lens 15 may be a conventional lens; alternatively, as shown in fig. 2, the projection optics 15 comprise a superlens. The embodiment of the utility model provides an adopt super lens as projection lens 15, can further make this holographic formula near-to-eye display system more slim, simple structure.
Wherein, the holographic near-to-eye display system provided by the embodiment of the present invention changes the phase through the angle modulator 13, and further can change the specific position of the modulation beam emitted by the angle modulator 13 to the spatial light modulator 14, and can generate the imaging beam of the display image at any position of the spatial light modulator 14, so that the holographic near-to-eye display system can have a larger eye movement range, for example, the imaging beams respectively generated at each position by the spatial light modulator 14 can be sequentially converged according to a preset sequence, and when the pupil looks at the holographic near-to-eye display system, the holographic near-to-eye display system can sequentially converge the imaging beams at different positions, and the pupil can follow the display image (such as a clear three-dimensional stereo image) sequentially generated by the holographic near-to-eye display system, and sequentially gazing (e.g., focusing) at the corresponding location of the displayed image.
The embodiment of the utility model provides a holographic near-to-eye display system adopts collimation super lens 12 and super lens formula's angle modulation ware 13, can not only enlarge the eye movement scope, compares in the holographic near-to-eye display system who uses traditional lens, and this holographic near-to-eye display system has still possessed the advantage that the quality is light, whole thickness is thin, the system is simple, the price is lower and the productivity is high, more accords with the market demand.
Optionally, referring to fig. 3, the holographic near-eye display system further comprises: an eye tracking system 16; the eye tracking system 16 is used to determine the gaze point of the human eye at the spatial light modulator 14; the human eye is at the point of gaze of the spatial light modulator 14 and is also the position where the modulated light beam emitted by the angle modulator 13 is directed into the spatial light modulator 14.
As shown in fig. 3, the eye tracking system 16 can be disposed on a side of the holographic near-eye display system near the pupil, for example, the eye tracking system 16 can be disposed on a light-emitting side of the projection lens 15. The eye tracking system 16 may be one of an infrared camera based on pupil-corneal reflectometry or retinal images, a structured light depth camera based on three-dimensional eye modeling, or a light-sensitive sensor based on the intensity of the retinal or corneal reflected light, among others.
In the case that the pupil gazes at the holographic near-eye display system, the gazing position of the pupil may be a certain position on the spatial light modulator 14, and the embodiment of the present invention refers to the certain position on the spatial light modulator 14 as the gazing point of the human eye on the spatial light modulator 14, and the gazing point of the human eye on the spatial light modulator 14 is also a specific position emitted by the modulated light beam emitted by the angle modulator 13 into the spatial light modulator 14. For example, the eye-tracking system 16 may determine, based on the gaze location to which the pupil rotates, the specific location in the spatial light modulator 14 that the modulated light beam emitted by the angle modulator 13 should be directed, i.e., the gaze point of the human eye at the spatial light modulator 14. In the embodiment of the present invention, the depth information of the display image at any position can be calculated on the spatial light modulator 14, and according to the fixation point of the spatial light modulator 14 determined by the eye tracking system 16, the imaging light beam of the display image at the fixation point is converged to the pupil, so that the pupil can see the display image at the fixation point; moreover, each time the pupil turns and gazes at the gazing point of the spatial light modulator 14, the holographic near-eye display system can converge the imaging light beam of the display image at the gazing point of the spatial light modulator 14, which is re-determined each time, to the pupil, so that the holographic near-eye display system can automatically cooperate with the rotation of the pupil (for example, the eye movement tracking system 16 determines which position on the spatial light modulator 14 is the gazing point of the human eye, and the holographic near-eye display system converges the imaging light beam of the gazing point) while expanding the eye movement range, so that the pupil can see the three-dimensional image which is desired to be seen and clear each time the pupil rotates.
Alternatively, as shown in fig. 4, the angle modulator 13 includes: a substrate 131, a nanostructure 132, a phase change material layer 133, a first electrode layer 134, and a second electrode layer 135; a plurality of nano-structures 132 are disposed on one side of the substrate 131, a first electrode layer 134 is filled around the nano-structures 132, and the height of the first electrode layer 134 is lower than that of the nano-structures 132; the phase change material layer 133 is disposed on a side of the first electrode layer 134 away from the substrate 131, and is filled around the nano-structure 132, and a sum of heights of the first electrode layer 134 and the phase change material layer 133 is greater than or equal to a height of the nano-structure 132; the second electrode layer 135 is disposed on a side of the phase change material layer 133 away from the substrate 131; the first electrode layer 134 and the second electrode layer 135 are used to apply a voltage to the phase change material layer 133, and the phase change material layer 133 can change the phase of the angle modulator 13 according to the applied voltage.
The substrate 131 of the angle modulator 13 may be made of quartz glass, crown glass, flint glass, or the like, one side of the substrate 131 of the angle modulator 13 (shown as the upper side of the substrate in fig. 4) is provided with a plurality of nanostructures 132, the nanostructures 132 may be highly uniform nanostructures, and the nanostructures 132 may be all-dielectric structural units and have high transmittance in a working band, optionally, the working band of the angle modulator 13 is a visible light band, that is, the angle modulator 13 has high transmittance in the visible light band, and the nanostructures 132 have high transmittance in the visible light band. Alternative materials include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, amorphous silicon, crystalline silicon, hydrogenated amorphous silicon, and the like. Optionally, the phase change material layer 133, the first electrode layer 134, and the second electrode layer 135 are transparent or semitransparent materials in the working band, and an absolute value of a difference between a refractive index of the nanostructure 132 and a refractive index of the phase change material layer 133, the first electrode layer 134, or the second electrode layer 135 is greater than or equal to 0.5. The phase change material layer 133, the first electrode layer 134, and the second electrode layer 135 are transparent or semitransparent materials in a visible light band, that is, the phase change material layer 133, the first electrode layer 134, and the second electrode layer 135 have high transmittance or transmittance between 40% and 60% for light in the visible light band, and absolute values of differences between refractive indexes of the phase change material layer 133, the first electrode layer 134, and the second electrode layer 135 and refractive indexes of the nano structures 132 are all greater than or equal to 0.5, so as to avoid affecting a light modulation effect.
The angle modulator 13 has a plurality of nanostructures 132, and a first electrode layer 134 is filled around the nanostructures 132 (e.g., the gap between two nanostructures), and the height of the first electrode layer 134 is lower than the height of each of the nanostructures 132, for example, the height of the first electrode layer 134 may be half of the height of the nanostructures 132. On the side of the first electrode layer 134 away from the substrate 131 (the upper side of the first electrode layer 134 as shown in fig. 4), a phase change material layer 133 is filled, the phase change material layer 133 is also filled around the plurality of nanostructures 132 like the first electrode layer 134, and the sum of the heights obtained by adding the height of the first electrode layer 134 to the height of the nanostructures 132 may be greater than the height of the nanostructures 132, or the sum of the heights may also be equal to the height of the nanostructures 132; as shown in fig. 4, the upper surface of the phase change material layer 133 is not lower than the upper surface of the nano-structure 132, so as to prevent the nano-structure 132 from contacting the second electrode 135. A second electrode layer 135 is disposed on a side of the phase change material layer 133 away from the substrate 131 (an upper side of the phase change material layer 133 as shown in fig. 4), the second electrode layer 135 and the first electrode layer 134 are respectively disposed at two sides of the phase change material layer 133, and are used for applying a voltage to the phase change material layer 133, wherein, after receiving the voltages applied by the first electrode layer 134 and the second electrode layer 135, the phase-change material layer 133, the phase change state of the phase change material layer 133 is changed, so that the phase of the angle modulator 13 can be changed, the angle of deflection of the collimated light beam entering the angle modulator 13 can then be varied, for example, by controlling the voltage to change the angle of incidence of the collimated light beam entering the angle modulator 13 in a targeted manner to a modulated light beam exiting at an exit angle, so that the modulated beam can be directed to the location where the spatial light modulator 14 is to generate the imaging beam.
In the case where the holographic near-eye display system provided by the embodiment of the present invention does not include the eye tracking system 16, and the angle modulator 13 is a superlens with the above-mentioned structure (as shown in fig. 5), the holographic near-eye display system can determine the exit angles (for example, the exit angles are 4) of the modulated light beams that are required to be emitted into the spatial light modulator 14 by the angle modulator 13 each time according to the preset positions (for example, the positions of the imaging light beams to be generated on the spatial light modulator 14, for example, the voltage magnitude that is required to be applied to the phase-change material layer 133 in the angle modulator 13 each time (for example, the voltage magnitudes are 4 matches), so that the spatial light modulator 14 can sequentially generate the imaging light beams at the corresponding positions (for example, the imaging light beams at the 4 positions) according to the preset sequence, so that the pupils can respectively look at the positions, such as the positions with the clear three-dimensional stereo images, to obtain the clear three-dimensional stereo images displayed at the positions; moreover, the depth information of all positions on the spatial light modulator 14 does not need to be calculated, and imaging light beams of all positions on the spatial light modulator 14 do not need to be generated, so that the calculation force is reduced; in the case where the holographic near-eye display system includes the eye tracking system 16 and the angle modulator 13 is the superlens with the above-described structure (as shown in fig. 6), when the pupil rotates once, the eye tracking system 16 can determine the gaze point of the spatial light modulator 14 at the next time to determine the exit angle of the modulated light beam that the angle modulator 13 needs to emit to the spatial light modulator 14 at the current time, so as to determine the magnitude of the voltage that needs to be applied to the phase change material layer 133 in the angle modulator 13 at the current time, and finally, the modulated light beam that emits to the spatial light modulator 14 can accurately strike the gaze point of the spatial light modulator 14 at the current time according to the applied voltage. When the pupil rotates each time, the holographic near-eye display system only needs to focus the imaging light beam of the display image generated at the current gaze point into the pupil, so that the pupil can see a clear three-dimensional image, the depth information of all positions on the spatial light modulator 14 does not need to be calculated, the imaging light beams of the display image of all positions on the spatial light modulator 14 do not need to be generated, namely, only the imaging light beam at the corresponding gaze point (such as a gaze point) is generated for the rotation of the pupil each time, and the calculation force can be reduced.
Alternatively, the phase change material used for the phase change material layer 133 is ge-sb-te.
The phase change material used for the phase change material layer 133 may be germanium antimony tellurium (GST, GeSbTe), for example, Ge 2 Sb 2 Te 5 . GST has and realizes that phase transition energy requires characteristics such as low, phase transition is reversible, and GST can realize the alternate reversible phase transition of crystalline state phase and amorphous state under the voltage of difference, thereby the embodiment of the utility model provides a thereby can utilize the different realization of GST crystalline state and amorphous state refracting index to the regulation of angle modulation ware 13 phase place.
Optionally, the first electrode layer 134 and the second electrode layer 135 are indium tin oxide.
The material used for the first electrode layer 134 and the second electrode layer 135 may be Indium Tin Oxide (ITO), which is an N-type oxide semiconductor and is transparent to visible light wave bands, and the material may have good conductivity as nano Indium tin metal oxide, and is relatively suitable for being made into electrode layers to be filled or disposed on two sides of the phase change material layer 133 of the embodiment of the present invention, and is used for applying a voltage to the phase change material layer 133.
Optionally, the holographic near-eye display system further comprises: a beam deflecting element 17; as shown in fig. 7, the beam deflecting element 17 is disposed between the spatial light modulator 14 and the projection lens 15, or, as shown in fig. 8, the beam deflecting element 17 is disposed on the light-emitting side of the projection lens 15; the beam deflecting element 17 is used to change the optical path direction of the imaging beam.
Referring to fig. 7, a beam deflecting element 17 is disposed between the light exit side of the spatial light modulator 14 and the light entrance side of the projection lens 15 of the holographic near-eye display system, where the beam deflecting element 17 may include a mirror, a prism, or an angular selective super-surface, etc., and the beam deflecting element 17 is a mirror in fig. 7, and the holographic near-eye display system has an eye tracking system 16. In the embodiment of the present invention, the light beam deflecting element 17 can change the light path direction of the imaging light beam generated by the spatial light modulator 14, for example, the imaging light beam is incident into the light beam deflecting element 17 (like a mirror) along the original emitting direction, and the light beam deflecting element 17 (like a mirror) is reflected on the surface to form a reflection, and the reflection direction is emitted to the projection lens 15. Alternatively, as shown in fig. 8, the beam deflecting element 17 may be disposed on the light exit side of the projection lens 15, for example, at a position close to the pupil, and in fig. 8, the beam deflecting element 17 is also used as a mirror, and the holographic near-eye display system has an eye tracking system 16. The beam deflecting element 17 can change the optical path direction of the imaging beam converged by the projection lens 15, for example, when the imaging beam converged by the projection lens 15 is incident on the surface of the beam deflecting element 17 (e.g., a mirror), the imaging beam is reflected on the surface of the beam deflecting element 17 (e.g., a mirror), so that the converged imaging beam is incident on the pupil along the reflection direction.
The embodiment of the utility model provides an adopt light beam deflection component 17 to change the light path direction of formation of image light beam, can change each device mode of arranging on the space among this holographic near-to-eye display system for this holographic near-to-eye display system can be applicable to more and use the scene, for example, can set up this holographic near-to-eye display system's partly mirror leg position at glasses.
The embodiment of the utility model provides a still provide a head-mounted display device, it is shown with reference to fig. 9, include: any one of the holographic near-to-eye display systems 1 and the support housing 2 described above; the holographic near-eye display system 1 is arranged inside a support housing 2, and the support housing 2 is used for fixing the holographic near-eye display system 1.
The embodiment of the utility model provides an among the head mounted display device, support casing 2 is used for encapsulating holographic near-to-eye display system 1 inside it, can fix and protect this holographic near-to-eye display system 1. The holographic near-to-eye display system 1 can be centrally arranged inside the support housing 2, so that when a user wears the head-mounted display device on the head, two eyes of the user can adaptively correspond to the holographic near-to-eye display system 1, and a function of displaying a three-dimensional stereoscopic image to pupils of human eyes is achieved. The embodiment of the utility model provides a wear-type display device adopts the nearly eye display system 1 of thin holographic formula more, can make whole wear-type display device's structure more frivolous compact, and it is higher to wear the comfort level.
Optionally, referring to fig. 9, the head-mounted display device further includes: and the fixing belt 3 is used for being connected with the supporting shell 2 and forming a ring-shaped structure which can be worn on the head of a user. Wherein, fixed band 3 forms loop configuration after linking to each other with support housing 2, makes the user when wearing this head mounted display device, can laminate the head profile more, promotes the comfort level of wearing.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the technical solutions of the changes or replacements within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A holographic near-eye display system, comprising: a light source (11), a collimating metalens (12), an angle modulator (13), a spatial light modulator (14) and a projection lens (15);
the collimating metalens (12) is arranged on the light emitting side of the light source (11) and is used for collimating the light beam emitted by the light source (11) and emitting a collimated light beam;
the angle modulator (13) is a phase-adjustable superlens, is arranged on the light-emitting side of the collimating superlens (12), and is used for changing the deflection angle of the collimated light beam and emitting a modulated light beam;
the spatial light modulator (14) is arranged on the light outlet side of the angle modulator (13) and is used for generating an imaging light beam for displaying an image;
the projection lens (15) is arranged on the light-emitting side of the spatial light modulator (14) and used for focusing the imaging light beam of the display image.
2. The holographic near-eye display system of claim 1, further comprising: an eye tracking system (16); the eye tracking system (16) is used for determining the fixation point of the human eye on the spatial light modulator (14); the human eye is at the fixation point of the spatial light modulator (14) and is also the position where the modulated light beam emitted by the angle modulator (13) is emitted into the spatial light modulator (14).
3. Holographic near-eye display system according to claim 1 or 2, wherein the angle modulator (13) comprises: a substrate (131), a nanostructure (132), a phase change material layer (133), a first electrode layer (134), and a second electrode layer (135);
one side of the substrate (131) is provided with a plurality of the nano structures (132), the first electrode layer (134) is filled around the nano structures (132), and the height of the first electrode layer (134) is lower than that of the nano structures (132); the phase change material layer (133) is arranged on one side, far away from the substrate (131), of the first electrode layer (134) and is filled around the nano structure (132), and the sum of the heights of the first electrode layer (134) and the phase change material layer (133) is greater than or equal to the height of the nano structure (132); the second electrode layer (135) is arranged on one side, away from the substrate (131), of the phase change material layer (133);
the first electrode layer (134) and the second electrode layer (135) are used for applying a voltage to the phase change material layer (133), and the phase change material layer (133) is capable of changing the phase of the angle modulator (13) according to the applied voltage.
4. The holographic near-to-eye display system of claim 3, in which the phase change material used in the phase change material layer (133) is germanium antimony tellurium.
5. The holographic near-to-eye display system of claim 3, in which the first electrode layer (134) and the second electrode layer (135) are indium tin oxide.
6. The holographic near-to-eye display system of claim 3, wherein the phase change material layer (133), the first electrode layer (134), and the second electrode layer (135) are transparent or semi-transparent materials in an operating band, and an absolute value of a difference between a refractive index of the nanostructures (132) and a refractive index of the phase change material layer (133), the first electrode layer (134), or the second electrode layer (135), respectively, is greater than or equal to 0.5.
7. Holographic near-to-eye display system according to claim 1, characterized in that the operating wavelength band of the angle modulator (13) is the visible wavelength band.
8. The holographic near-to-eye display system of claim 1, wherein the projection lens (15) comprises: a superlens.
9. The holographic near-eye display system of claim 1, wherein the spatial light modulator (14) comprises: spatial light modulators based on super-surfaces.
10. The holographic near-eye display system of claim 1 or 2, further comprising: a beam deflecting element (17); the light beam deflection element (17) is arranged between the spatial light modulator (14) and the projection lens (15), or the light beam deflection element (17) is arranged on the light emergent side of the projection lens (15);
the beam deflection element (17) is used for changing the optical path direction of the imaging beam.
11. A head-mounted display device, comprising: the holographic near-to-eye display system (1) as claimed in any of claims 1 to 10 and a support housing (2);
the holographic near-to-eye display system (1) is arranged inside the support shell (2); the support housing (2) is used for fixing the holographic near-to-eye display system (1).
12. The head-mounted display device of claim 11, further comprising: the fixing band (3) is used for being connected with the supporting shell (2) and forms an annular structure which can enable a user to wear the head.
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| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| CN118534662A (en) * | 2024-07-26 | 2024-08-23 | 比亚迪股份有限公司 | Image generation unit, head-up display system and vehicle |
| US12140778B2 (en) | 2019-07-02 | 2024-11-12 | Metalenz, Inc. | Metasurfaces for laser speckle reduction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| US12140778B2 (en) | 2019-07-02 | 2024-11-12 | Metalenz, Inc. | Metasurfaces for laser speckle reduction |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| CN118534662A (en) * | 2024-07-26 | 2024-08-23 | 比亚迪股份有限公司 | Image generation unit, head-up display system and vehicle |
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