CN217467352U - Near-to-eye display optical system - Google Patents
Near-to-eye display optical system Download PDFInfo
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- CN217467352U CN217467352U CN202221339579.0U CN202221339579U CN217467352U CN 217467352 U CN217467352 U CN 217467352U CN 202221339579 U CN202221339579 U CN 202221339579U CN 217467352 U CN217467352 U CN 217467352U
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Abstract
The utility model provides a near-to-eye display optical system, wherein, this near-to-eye display optical system includes: a display, a superlens array and a projection lens; the super lens array is arranged on one side of the display capable of displaying images; the projection lens is arranged on one side of the super lens array far away from the display; the projection lens is used for projecting and enlarging an image into a virtual image on one side of the display far away from the projection lens; the superlens array comprises a plurality of adjustable superlenses; the adjustable superlens is used to change a distance between at least a portion of the virtual image and the display. Through the near-eye display optical system provided by the embodiment of the utility model, the superlens array is adopted as an optical element for modulating the distance between the virtual image and the display, so that the distance can be accurately and rapidly modulated, and the convergence accommodation regulation conflict can be relieved; compared with a near-eye display system using the existing lens (such as a micro lens), the near-eye display optical system also has the advantages of light weight, thin overall thickness, simple system, lower price and high productivity.
Description
Technical Field
The utility model relates to a virtual reality technical field particularly, relates to a near-to-eye display optical system.
Background
When a human eye views a target object, the human eye usually adjusts the two eyeballs to steer the two eyeballs to a target direction, for example, when the target object is close, the two eyeballs turn inwards; when the object is far away, the two eyeballs rotate outwards, so that the convergence of vision is generated. Meanwhile, the brain can perform ' adaptive adjustment ', also called focus adjustment ', through information extraction and processing of the brain according to different images of the target object observed by the two eyeballs; for example, the eyeball is adjusted to a correct focal length so that a person can feel a stereoscopic effect with a sense of gradation from an image. Generally, convergence and accommodation occur in pairs, which is our physiological phenomenon, but when related products of Virtual Reality (VR) technology are used, a binocular vision-based near-eye display optical system, which includes optical elements and a display, is generally disposed between human eyes and a target object. The visual system in the brain of the viewer forces the eyeballs to focus on the virtual 3D image generated by the near-eye display optical system according to the normal physiological response of human beings, and the crystalline lenses of the human eyes focus on the plane of the system display, thereby generating VAC (vergence-convergence accommodation conflict, or called focusing conflict), resulting in mismatching of accommodation distance and convergence distance of the human eyes and dizziness.
At present, a microlens array may be provided between a display and an optical element of the near-eye display optical system to change the position of the microlens array in a global or individual control manner, thereby achieving the purpose of changing the position of a virtual image and reducing VAC. However, the difficulty is high when the microlens array is pushed or pulled accurately; moreover, the thickness of the microlens array lens is thick and not light and thin enough, which is not favorable for the development of the near-to-eye display optical system including the microlens array lens toward miniaturization and light weight.
SUMMERY OF THE UTILITY MODEL
To solve the above problem, an embodiment of the present invention provides a near-eye display optical system.
An embodiment of the utility model provides a near-to-eye display optical system, include: a display, a superlens array and a projection lens; the super lens array is arranged on one side of the display capable of displaying images; the projection lens is arranged on one side of the super lens array far away from the display; the projection lens is used for enlarging the image into a virtual image in a projection manner on one side of the display far away from the projection lens; the superlens array comprises a plurality of tunable superlenses; the adjustable superlens is configured to change a distance between at least a portion of the virtual image and the display.
Optionally, the tunable superlens comprises: the first super lens and the displacement module are oppositely attached; the displacement module is used for changing the distance between the first superlens and the display, and the displacement module is transparent in a working waveband; the focal length of each first superlens is the same.
Optionally, the first superlens comprises: a first nanostructure and a filling material filled around the first nanostructure; the filling material is transparent or semitransparent material in a working waveband, and the absolute value of the difference between the refractive index of the filling material and the refractive index of the first nanostructure is greater than or equal to 0.5.
Optionally, the tunable superlens comprises: a second superlens; the second superlens includes: the phase change material layer comprises a substrate, a second nanostructure, a phase change material layer, a first electrode layer and a second electrode layer; a plurality of second nanostructures are arranged on one side of the substrate, the first electrode layer is filled around the second nanostructures, and the height of the first electrode layer is lower than that of the second 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 second nanostructure, 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 second nanostructure; 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 applying voltage to the phase-change material layer, and the phase-change material layer can change the focal length of the second superlens according to the applied 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 tunable superlens comprises: a third superlens comprising an electrode layer, an electro-actuation layer, and a third nanostructure; the electrode layers are arranged on two sides of the electric actuating layer; the third nanostructure is arranged on one side of the electrode layer far away from the electric actuating layer; and the electric actuating layer displaces along the height axis direction of the third nanostructure under the action of an electric field provided by the electrode layer, so that the phase of the third superlens is changed.
Optionally, each of the tunable superlenses is an individually tuned superlens.
Optionally, the projection optics comprises: a superlens.
Optionally, the display comprises: a light emitting diode display, an organic light emitting diode display, a silicon based liquid crystal display, a digital micromirror device, or a mems based laser beam scanning display.
In the scheme provided by the embodiment of the utility model, the superlens array is used as an optical element for modulating the distance between the virtual image and the display, so that the modulation can be accurately and rapidly carried out, and the visual convergence adjustment conflict is relieved; compared with a near-eye display system using the existing lens (such as a micro lens), the near-eye display optical system also has the advantages of light weight, thin overall thickness, simple system, lower price and high productivity.
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 structural diagram of a near-eye display optical system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram illustrating a projection lens in a near-eye display optical system according to an embodiment of the present invention is a superlens;
fig. 3 is a schematic diagram illustrating global regulation in a near-eye display optical system according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a partial adjustment in a near-eye display optical system according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a specific structure of an adjustable superlens in a near-eye display optical system according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an overall adjustment and control of a superlens array having a displacement module in a near-eye display optical system according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a super-lens array with a displacement module for partial adjustment in a near-eye display optical system according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a specific structure of a second superlens in a near-eye display optical system according to an embodiment of the present invention;
fig. 9 is a schematic diagram illustrating an overall adjustment of a superlens array having a second superlens in a near-eye display optical system according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a partial adjustment of a superlens array having a second superlens in a near-eye display optical system according to an embodiment of the present invention;
fig. 11 is a schematic diagram illustrating a specific structure of a third superlens in a near-eye display optical system according to an embodiment of the present invention;
fig. 12 is a schematic diagram illustrating an overall adjustment of a superlens array having a third superlens in a near-eye display optical system according to an embodiment of the present invention;
fig. 13 is a schematic diagram illustrating a partial adjustment of a superlens array having a third superlens in a near-eye display optical system according to an embodiment of the present invention.
An icon:
1-display, 2-super lens array, 3-projection lens, 21-adjustable super lens, 211-first super lens, 212-displacement module, 213-second super lens, 214-third super lens, 2131-substrate, 2132-second nanostructure, 2133-phase change material layer, 2134-first electrode layer, 2135-second electrode layer, 2141-electrode layer, 2142-electric actuating layer, 2143-third nanostructure.
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 implicitly indicating 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 expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be 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 near-to-eye display optical system, it is shown with reference to fig. 1 that this near-to-eye display optical system includes: a display 1, a superlens array 2 and a projection lens 3; the superlens array 2 is arranged on one side of the display 1 capable of displaying images; the projection lens 3 is arranged on one side of the super lens array 2 far away from the display 1; the projection lens 3 is used for projecting and enlarging an image into a virtual image on one side of the display 1 far away from the projection lens 3; the superlens array 2 comprises a plurality of adjustable superlenses 21; the adjustable superlens 21 is used to change the distance between at least part of the virtual image and the display 1.
In the near-eye display optical system provided by the embodiment of the present invention, the display 1 is used for displaying an image, and the displayed image is a real image, i.e., a real image. Optionally, the display 1 comprises: a light emitting diode display, an organic light emitting diode display, a silicon-based liquid crystal display, a digital micromirror device, or a mems-based laser beam scanning display; the displays have smaller overall structures, belong to micro-displays, and are more suitable for the near-eye display optical system. The projection lens 3 is provided on a side of the display 1 where an image can be displayed, and the projection lens 3 is a lens that can perform an enlarging function, for example, the projection lens 3 can enlarge the image displayed on the display 1 and display the enlarged image on a side of the display 1 away from the projection lens 3 (e.g., a side of the display 1 where an image cannot be displayed), so that a virtual image, that is, a virtual image is formed. Wherein, referring to fig. 1, the projection lens 3 may be a conventional lens, such as a convex lens; alternatively, as shown in fig. 2, the projection optics 3 comprise a superlens. The embodiment of the utility model provides an adopt super lens as projection lens piece 3, it can carry out wafer level encapsulation with super lens array 2 and display 1, no longer need consider the alignment problem between the optical axis, greatly reduced manufacturing cost and the degree of difficulty.
The embodiment of the present invention provides a near-to-eye display optical system, in which a super lens array 2 is disposed between a display 1 and a projection lens 3, and corresponds to one side of the display 1 capable of displaying images. As shown in fig. 3, the circular image to be located on the side of the projection lens 3 away from the display 1 in fig. 3 represents the human eye; the super lens array 2 comprises a plurality of adjustable super lenses 21, and the adjustable super lenses 21 can integrally modulate a virtual image amplified by the projection lens 3 so as to integrally change the distance between the virtual image and the display 1; for example, the adjustable superlenses 21 are controlled simultaneously, so that the magnified virtual image is moved from the original plane a to the plane B, and the plane a is parallel to the plane B; alternatively, the adjustable superlenses 21 correspond to respective regions of the display 1, and partially modulate a virtual image enlarged by the projection lens 3, thereby changing a distance between a partial image of the virtual image and the display 1. Optionally, each tunable superlens 21 is an individually tuned superlens. In case each adjustable superlens 21 is a freely adjustable independent unit, the distance between each part of the virtual image and the display 1 can be individually changed by individually adjusting each adjustable superlens 21. For example, by adjusting all the adjustable superlenses 21 (as shown in fig. 4, 6 adjustable superlenses 21), the 6 partial images corresponding to the 6 adjustable superlenses 21 in the enlarged virtual image (the 6 partial images are spliced to form the entire virtual image) are respectively moved.
In the embodiment of the present invention, when the global adjustment changes the distance between the entire virtual image and the display 1, the modulation rate (e.g., modulation rate) of the superlens array 2 is at least N times of the display frame rate of the display 1, where the display frame rate is the number of images played by the display 1 in 1 second, and N is the number of reconstructed image planes (i.e., the required depth information number); for example, when it is necessary to use 8 pieces of depth information (for example, 8 virtual images) to alleviate the convergence adjustment conflict, the modulation rate corresponding to the entire control lower super lens array 2 is 8 times the display frame rate of the display 1, and the modulation rate is large. On the condition that the display 1 is divided into M parts, each part can be enlarged into a partial virtual image, and the M adjustable superlenses 21 can adjust the distance between the corresponding partial virtual image and the display 1, the modulation rate of the superlens array 2 is at least N/M times of the display frame rate of the display 1, which is equivalent to that each adjustable superlens 21 can realize modulation by only reconstructing N/M pieces of depth information, so that the modulation rate or modulation speed of each adjustable superlens 21 can be reduced to N/M; for example, in the case that the convergence adjustment conflict needs to be alleviated by means of 8 pieces of depth information (for example, virtual images at 8 positions), if there are 3 adjustable superlenses 21, each adjustable superlens 21 may correspond to a part of the display 1, and the display 1 is divided into 3 parts, and as long as the modulation rate corresponding to each adjustable superlens 21 is 8/3 times of the display frame rate of the display 1, 8 pieces of depth information can be obtained by modulation, so that the modulation rate standard of the adjustable superlens 21 can be reduced, the entire modulation process can be implemented more easily, and the convergence adjustment conflict can be alleviated.
The embodiment of the utility model provides an among the near-to-eye display optical system, adopt super lens array 2 as the optical element who modulates the distance between virtual image and the display 1, can not only accurately and modulate fast, compare in the near-to-eye display system who uses current lens (like microlens), this near-to-eye display optical 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.
Alternatively, referring to fig. 5, the tunable superlens 21 includes: a first super lens 211 and a displacement module 212 which are oppositely attached; the displacement module 212 is used for changing the distance between the first superlens 211 and the display 1, and the displacement module 212 is transparent in the working waveband; the focal length of each first superlens 211 is the same.
In the embodiment of the present invention, as shown in fig. 5, the displacement module 212 included in each adjustable super lens 21 is attached to one side of the first super lens 211, and the displacement module 212 may be disposed on one side of the first super lens 211 close to the display 1; alternatively, the displacement module 212 may also be disposed on a side of the first superlens 211 away from the display 1, which is not limited by the embodiment of the present invention. The displacement module 212 may be a piezoelectric ceramic, a magnetostrictive displacement device, an electrostrictive displacement device, or the like. The displacement module 212 in each tunable superlens 21 is transparent in the operating band, i.e., has high transmittance for light in the operating band (e.g., visible light emitted by the display 1), so that the image displayed by the display 1 can pass through the tunable superlens 21.
In the embodiment of the present invention, when the distance between the virtual image and the display 1 needs to be adjusted integrally, the distance between each first superlens 211 and the display 1 can be changed integrally by the displacement module 212 corresponding to each adjustable superlens 21, and simultaneously and in the same range, so that the distance between the virtual image amplified by each adjustable superlens 21 and the display 1 changes; since the focal length of each first superlens 211 in the superlens array 2 is the same, it can be ensured that the distance between the virtual image and the display 1 is changed as a whole by changing the distance between each first superlens 211 and the display 1 as a whole. For example, referring to fig. 6, each of the displacement modules 212 in fig. 6 is disposed on a side of each of the first superlenses 211 close to the display 1, virtual images generated by the near-eye display optical system originally lie in a same plane a, and when all of the displacement modules 212 are adjusted, distances between each of the first superlenses 211 and the display 1 are changed and still equal, so that the virtual image can be adjusted to another plane B as a whole, and the plane a is parallel to the plane B. When the distance between the virtual image and the display 1 needs to be partially adjusted (for example, when the image of the partial region in the virtual image is respectively changed in position in the direction perpendicular to the display 1), referring to fig. 7, the distance between the corresponding first superlens 211 and the display 1 may be respectively changed by the displacement module 212 corresponding to the corresponding adjustable superlens 21, so that the distance between the partial virtual image enlarged by the corresponding adjustable superlens 21 and the display 1 is changed.
The embodiment of the utility model provides an among the near-to-eye display optical system, the adjustable super lens 21 of every in super lens array 2 adopts displacement module 212 and the structure of first super lens 211 laminating mutually, makes every displacement module 212 can wholly or the distance between the corresponding first super lens 211 of partial control and the display 1 to wholly or locally change the distance between virtual image and the display 1, improve the confliction of vision regulation.
Optionally, the first superlens 211 includes: a first nanostructure and a filling material filled around the first nanostructure; the filling material is transparent or semitransparent material in an operating waveband, and the absolute value of the difference between the refractive index of the filling material and the refractive index of the first nano structure is greater than or equal to 0.5.
In the embodiment of the present invention, in the working wavelength band of the near-to-eye display optical system, if the visible light wavelength band, each of the first super lenses 211 is transparent, i.e. has high transmittance to the light of the working wavelength band. The first superlens 211 includes a first nano-structure and a filling material filled around the first nano-structure, and the filling material filled around the first nano-structure is also a material transparent or translucent in an operating band, that is, the filling material has a high transmittance or a transmittance between 40% and 60% for light (such as visible light) in the operating band, so as to protect the nano-scale first nano-structure. The absolute value of the difference between the refractive index of the filling material and the refractive index of the first nanostructure is greater than or equal to 0.5, so that the filling material is prevented from influencing the light modulation effect.
Alternatively, as shown in fig. 8, the tunable superlens 21 includes: a second superlens 213; the second superlens 213 includes: a substrate 2131, a second nanostructure 2132, a phase change material layer 2133, a first electrode layer 2134, and a second electrode layer 2135; a plurality of second nanostructures 2132 are arranged on one side of the substrate 2131, the first electrode layer 2134 is filled around the second nanostructures 2132, and the height of the first electrode layer 2134 is lower than that of the second nanostructures 2132; the phase change material layer 2133 is arranged on one side of the first electrode layer 2134, which is far away from the substrate 2131, and is filled around the second nanostructures 2132, and the sum of the heights of the first electrode layer 2134 and the phase change material layer 2133 is greater than or equal to the height of the second nanostructures 2132; the second electrode layer 2135 is disposed on a side of the phase change material layer 2133 away from the substrate 2131; the first electrode layer 2134 and the second electrode layer 2135 are used for applying a voltage to the phase change material layer 2133, and the phase change material layer 2133 can change the focal length of the second superlens 213 according to the applied voltage.
Wherein, the substrate 2131 of the second superlens 213 may be quartz glass, crown glass, flint glass, etc., one side of the substrate 2131 of the second superlens 213 (the upper side of the substrate is shown in fig. 8) is provided with a plurality of second nanostructures 2132, the second nanostructures 2132 may be highly uniform nanostructures, and the second nanostructures 2132 may be all-dielectric structural units, and have high transmittance in the visible light band, and the selectable materials include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, amorphous silicon, crystalline silicon, hydrogenated amorphous silicon, and the like. The first electrode layer 2134 is filled around the plurality of second nanostructures 2132 (e.g., the gap between two nanostructures) of the second superlens 213, and the height of the first electrode layer 2134 is lower than the height of each second nanostructure 2132, for example, the height of the first electrode layer 2134 may be half of the height of the second nanostructures 2132. A phase change material layer 2133 is filled on a side of the first electrode layer 2134 away from the substrate 2131 (an upper side of the first electrode layer 2134 shown in fig. 8), the phase change material layer 2133 is also filled around the plurality of second nanostructures 2132 like the first electrode layer 2134, and a sum of heights obtained by adding a height of the phase change material layer 2133 to a height of the first electrode layer 2134 may be greater than a height of the second nanostructures 2132, or the sum of the heights may also be equal to a height of the second nanostructures 2132; as shown in fig. 8, the upper surface of the phase change material layer 2133 is not lower than the upper surface of the second nanostructure 2132, so as to prevent the second nanostructure 2132 from contacting the second electrode 2135. A second electrode layer 2135 is disposed on a side of the phase change material layer 2133 away from the substrate 2131 (e.g., an upper side of the phase change material layer 2133 shown in fig. 8), where the second electrode layer 2135 and the first electrode layer 2134 are respectively disposed on two sides of the phase change material layer 2133 and are used for applying a voltage to the phase change material layer 2133, and after the phase change material layer 2133 receives the voltages applied by the first electrode layer 2134 and the second electrode layer 2135, a phase change state of the phase change material layer 2133 changes, so that a focal length of the second super lens 213 can be changed, and a distance between the virtual image and the display 1 can be changed.
The embodiment of the utility model provides an in, when unified the same voltage of applying to the phase change material layer of every second super lens 213 carries out whole regulation and control, can realize changing the distance between whole virtual image and the display 1 (see fig. 9 shows, the virtual image is whole can be removed to plane B by plane A), and when applying voltage alone to the phase change material layer of different second super lenses 213 respectively, change the focus of partial second super lens 213 promptly, can realize changing the distance between the local image of virtual image and the display 1 (see fig. 10) to improve the confliction of visual accommodation and adjust the conflict. Wherein the first electrode layer 2134 may be a positive electrode layer, and the second electrode layer 2135 may be a negative electrode layer; alternatively, the first electrode layer 2134 may be a negative electrode layer, and the second electrode layer 2135 may be a positive electrode layer, which is not limited by the embodiment of the present invention.
The embodiment of the utility model provides an among the near-to-eye display optical system, with the super lens 213 of second as adjustable super lens 21, this super lens 213 of second not only includes basement 2131 and second nanostructure 2132, phase change material layer 2133 has still been selected pertinence and has been filled around this second nanostructure 2132 as filling material, utilized this phase change material layer 2133 can change phase change state's speciality correspondingly after receiving the influence of voltage, thereby change the focus of this super lens 213 of second, and then can wholly or locally change super lens array 2's focus, make the distance between virtual image in this near-to-eye display optical system and the display 1 take place whole or local change.
Optionally, the phase change material used in the phase change material layer 2133 is germanium antimony tellurium.
The phase change material selected for the phase change material layer 2133 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 refractive index to the regulation of second superlens 213 focus.
Optionally, the first electrode layer 2134 and the second electrode layer 2135 are indium tin oxide.
The material used for the first electrode layer 2134 and the second electrode layer 2135 may be Indium Tin Oxide (ITO), which is an N-type oxide semiconductor and is transparent to visible light bands, and the material used as nano Indium tin metal oxide may have good conductivity, and is relatively suitable for being made into electrode layers to be filled or disposed on two sides of the phase change material layer 2133 in an embodiment of the present invention, and is used for applying a voltage to the phase change material layer 2133.
Alternatively, referring to fig. 11, the tunable superlens 21 includes: a third superlens 214, the third superlens 214 including an electrode layer 2141, an electrically actuated layer 2142, and third nanostructures 2143; electrode layers 2141 are disposed on both sides of the electrically active layer 2142; the third nano-structure 2143 is disposed on a side of the electrode layer 2141 away from the electrically active layer 2142; the electric actuation layer 2142 is displaced along the height axis of the third nanostructure 2143 by an electric field provided by the electrode layer 2141, thereby changing the phase of the third superlens 214.
Referring to fig. 11, the third superlens 214 provided in the present embodiment uses the electric actuation layer 2142 as a substrate, the electrode layer 2141 is disposed at two ends of the electric actuation layer 2142, and the third nanostructure 2143 is disposed on a side of the electrode layer 2141 away from the electric actuation layer 2142. The electrically actuated layer 2142 is displaced along the height axis of the third nanostructure 2143 by an electric field provided by the electrode layer 2141, thereby adjusting the height of the third nanostructure 2143. That is, the embodiment of the present application uses a height-adjustable substrate (e.g., the electric actuation layer 2142) to realize the height adjustment of the third nanostructure 2143, so as to actively change the phase of the third superlens 214, and finally change the focal length of the third superlens 214.
In the embodiment of the present invention, change through unifying the phase place simultaneously when every third super lens 214, make the focus of every third super lens 214 become unanimous correspondingly, and then can realize changing the distance between whole virtual image and the display 1 (see fig. 12 shows, the virtual image wholly can be moved to plane B by plane a), and when making the phase place of different third super lenses 214 change respectively, for example, change the focal length of partial third super lens 214, can realize changing the distance between local image in this virtual image and display 1 (see fig. 13), adjust the conflict with improvement vision vergence.
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 (10)
1. A near-eye display optical system, comprising: the display device comprises a display (1), a super lens array (2) and a projection lens (3);
the superlens array (2) is arranged on one side of the display (1) capable of displaying images; the projection lens (3) is arranged on one side of the super lens array (2) far away from the display (1);
the projection lens (3) is used for projecting and enlarging the image into a virtual image on one side of the display (1) far away from the projection lens (3);
the superlens array (2) comprises a plurality of adjustable superlenses (21); the adjustable superlens (21) is used for changing the distance between at least part of the virtual image and the display (1).
2. The near-eye display optical system according to claim 1, wherein the adjustable superlens (21) comprises: a first super lens (211) and a displacement module (212) which are oppositely attached;
the displacement module (212) is used for changing the distance between the first super lens (211) and the display (1), and the displacement module (212) is transparent in an operating waveband;
the focal length of each first superlens (211) is the same.
3. The near-eye display optical system according to claim 2, wherein the first superlens (211) comprises: a first nanostructure and a filling material filled around the first nanostructure;
the filling material is transparent or semitransparent material in an operating waveband, and the absolute value of the difference between the refractive index of the filling material and the refractive index of the first nano structure is greater than or equal to 0.5.
4. The near-eye display optical system according to claim 1, wherein the adjustable superlens (21) comprises: a second superlens (213); the second superlens (213) includes: a substrate (2131), second nanostructures (2132), a phase change material layer (2133), a first electrode layer (2134), and a second electrode layer (2135);
a plurality of second nanostructures (2132) are arranged on one side of the substrate (2131), the first electrode layer (2134) is filled around the second nanostructures (2132), and the height of the first electrode layer (2134) is lower than that of the second nanostructures (2132); the phase change material layer (2133) is arranged on one side, away from the substrate (2131), of the first electrode layer (2134) and filled around the second nanostructures (2132), and the sum of the heights of the first electrode layer (2134) and the phase change material layer (2133) is greater than or equal to the height of the second nanostructures (2132); the second electrode layer (2135) is arranged on one side, away from the substrate (2131), of the phase change material layer (2133);
the first electrode layer (2134) and the second electrode layer (2135) are used for applying a voltage to the phase change material layer (2133), and the phase change material layer (2133) can change the focal length of the second superlens (213) according to the applied voltage.
5. The near-to-eye display optical system of claim 4, wherein the phase change material used in the phase change material layer (2133) is germanium antimony tellurium.
6. The near-eye display optical system of claim 4, wherein the first electrode layer (2134) and the second electrode layer (2135) are indium tin oxide.
7. The near-eye display optical system according to claim 1, wherein the adjustable superlens (21) comprises: a third superlens (214), the third superlens (214) comprising an electrode layer (2141), an electro-active layer (2142), and a third nanostructure (2143); the electrode layers (2141) are arranged on two sides of the electric actuating layer (2142); the third nanostructure (2143) is disposed on a side of the electrode layer (2141) distal from the electrically actuated layer (2142);
the electric actuating layer (2142) is displaced along the height axis direction of the third nanostructure (2143) under the action of an electric field provided by the electrode layer (2141), and the phase of the third superlens (214) is changed.
8. The near-to-eye display optical system of claim 1, wherein each of the adjustable superlenses (21) is an individually adjustable superlens.
9. The near-eye display optical system according to claim 1, wherein the projection lens (3) comprises: a superlens.
10. The near-eye display optical system according to claim 1, wherein the display (1) comprises: a light emitting diode display, an organic light emitting diode display, a silicon based liquid crystal display, a digital micromirror device, or a mems-based laser beam scanning display.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| 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 |
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