CN217639776U - Light source module and retina projection system - Google Patents
Light source module and retina projection system Download PDFInfo
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- CN217639776U CN217639776U CN202221923866.6U CN202221923866U CN217639776U CN 217639776 U CN217639776 U CN 217639776U CN 202221923866 U CN202221923866 U CN 202221923866U CN 217639776 U CN217639776 U CN 217639776U
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Abstract
The utility model provides a light source module and retina projection system, wherein, this light source module includes: a light emitting array, a superlens array and a collimating lens; the light emitting array comprises a plurality of light emitting units arranged in an array, and the super lens array comprises a plurality of super lens units arranged in an array; the super lens array is positioned on the light emitting side of the light emitting array; the superlens array comprises a plurality of superlens unit groups, each superlens unit group comprises at least one superlens unit, and different superlens unit groups are used for converging light rays emitted by the light-emitting units corresponding to the positions to positions with different depths; the collimating lens is used for collimating the light rays emitted by the super lens array. Through the light source module and the retina projection system provided by the embodiment of the utility model, the light source module can emit combined light rays with different depths, and can be applied to retina projection scenes with multiple depths; the super lens array has the characteristics of lightness and thinness, so that the whole volume of the light source module is smaller, and the weight is lighter.
Description
Technical Field
The utility model relates to a near-to-eye display technology field particularly, relates to a light source module and retina projection system.
Background
In near-eye display systems such as AR (Augmented Reality)/VR (Virtual Reality), focusing conflicts may occur due to differences between vertical distance (eye lens focusing distance) and Accommodation distance (eye convergence distance), and vertigo and fatigue may easily occur in the use process of a user. Retinal projection is one solution to resolve focusing conflicts. Retinal projection scans a picture, which can be projected pixel by pixel onto the retina of a person.
At present, the light source module in the retina projection scheme needs to use the microlens array to realize light convergence, and the volume is great, and weight is also heavier, is unsuitable for wearable equipment of wear-type.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an embodiment of the present invention provides a light source module and a retina projection system.
In a first aspect, an embodiment of the present invention provides a light source module, including: a light emitting array, a superlens array and a collimating lens; the light emitting array comprises a plurality of light emitting units arranged in an array, and the super lens array comprises a plurality of super lens units arranged in an array;
the light emitting units in the light emitting array are used for emitting light rays;
the super lens array is positioned on the light emitting side of the light emitting array; the superlens array comprises a plurality of superlens unit groups, each superlens unit group comprises at least one superlens unit, and different superlens unit groups are used for converging light rays emitted by the light-emitting units corresponding to different positions to positions with different depths;
the collimating lens is positioned on the light-emitting side of the super lens array and is used for collimating the light emitted by the super lens array.
In a possible implementation manner, the light emitting array and the super lens array are attached to each other, and the light emitting units correspond to the super lens units one to one.
In one possible implementation manner, the light emitting units corresponding to the superlens unit group at least include at least one red light emitting unit, at least one green light emitting unit, and at least one blue light emitting unit.
In one possible implementation, the superlens units in the same superlens unit group are staggered.
In one possible implementation, the collimating lens is a superlens.
In one possible implementation, the superlens unit and the collimating lens are both superlenses capable of achromatization.
In one possible implementation, all superlens cells in the superlens cell group have the same focal length.
In one possible implementation, the superlens unit is a focal length adjustable superlens, and the focal lengths of all superlens units in the superlens unit group are synchronously adjustable.
In one possible implementation, the superlens cell includes an actuation element and a phase change element made of a phase change material;
the actuation element is to apply an actuation to the phase change element; the phase change element can change a phase change state under the action of the excitation, so that the super lens unit changes the modulation effect on incident light and adjusts the focal length of the super lens unit.
In one possible implementation, the actuation element includes a first electrode layer and a second electrode layer, the phase change element is a layered structure, and the superlens unit further includes a substrate and at least one nanostructure;
the nano structure and the first electrode layer are arranged on the same side of the substrate, and the first electrode layer is filled around the nano structure; the height of the first electrode layer is less than the height of the nanostructures;
the phase change element is positioned on one side of the first electrode layer, which is far away from the substrate, and is filled around the nano structure; the sum of the heights of the first electrode layer and the phase change element is greater than the height of the nanostructure;
the second electrode layer is positioned on one side of the phase change element far away from the first electrode layer; the first electrode layer and the second electrode layer are used to apply a voltage to the phase change element.
In one possible implementation, in the case of i ≠ j, f i,u ≠f j,v ；
Wherein f is i,u Denotes the u-th focal length, f, modulated by the i-th superlens unit group j,v Represents the v-th focal length modulated by the j-th superlens unit group; i. the value range of j is [1, N ]]U and v have a value range of [1, M ]]N represents the number of superlens unit groups included in the superlens array, and M represents the number of focal length types that can be modulated by the superlens unit groups.
In a second aspect, embodiments of the present invention further provide a retinal projection system, including: the light source module and the scanning mirror are described above;
the light source module is used for emitting combined light corresponding to each pixel;
the scanning mirror is positioned on the light-emitting side of the light source module and used for scanning the combined light rays so as to generate a scanning light field of an image at an observation position.
In one possible implementation, the retinal projection system further includes: a mirror;
the reflecting mirror is positioned on the light emergent side of the scanning mirror and used for reflecting the combined light emitted by the scanning mirror to the observation position.
In one possible implementation, the mirror is a curved mirror or a super-surface.
In a possible implementation, the mirror is also capable of transmitting at least part of the light in the visible wavelength band; and the retinal projection system further comprises a phase compensator;
the phase compensator is positioned on one side of the reflecting mirror far away from the scanning mirror and is used for performing phase compensation on at least part of light rays of the visible light wave band which penetrate through the phase compensator, so that at least part of light rays of the visible light wave band which penetrate through the phase compensator and the reflecting mirror are free of aberration.
In one possible implementation, the mirror and the phase compensator are both super-surfaces and are capable of being achromatic.
The embodiment of the utility model provides an in the above-mentioned scheme that the first aspect provided, luminescence unit and super lens unit are the array arrangement, and super lens unit is divided into a plurality of super lens unit groups, and every super lens unit group can converge the position to the different degree of depth with the light that corresponding luminescence unit sent for this light source module can send the combination light that has the different degree of depth, can be applied to the retina projection scene of many depths. And, realize the modulation to the luminescence unit with super lens array, do not need the microlens, this super lens array has frivolous characteristics for the holistic volume of this light source module is less, and weight is also lighter, and this light source module is applicable to scenes such as wearable equipment more, supports the long-time use of user.
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 description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a light source module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram illustrating a light source module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an arrangement of a superlens array provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating another arrangement of a superlens array provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a superlens unit provided by an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a structure of a retinal projection system provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of another structure of a retinal projection system provided by an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating another structure of a retinal projection system provided by an embodiment of the present invention.
An icon:
10-light emitting array, 20-super lens array, 30-collimating lens; 40-scanning mirror, 50-reflecting mirror, 60-phase compensator; 11-luminous unit group, 101-luminous unit, 21-super lens unit group and 201-super lens unit; 2011-first electrode layer, 2012-second electrode layer, 2013-phase change element, 2014-substrate, 2015-nanostructure; 1-pupil, 2-lens, 3-retina.
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 simplification of 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 of ordinary skill in the art.
The embodiment of the utility model provides a light source module, this light source module can be used for realizing the retina projection. Referring to fig. 1, the light source module includes: a light emitting array 10, a superlens array 20, and a collimating lens 30; the light emitting array 10 includes a plurality of light emitting cells 101 arranged in an array, and the superlens array 20 includes a plurality of superlens cells 201 arranged in an array.
Wherein the light emitting units 101 in the light emitting array 10 are used for emitting light. The superlens array 20 is positioned at the light-emitting side of the light-emitting array 10; the superlens array 20 includes a plurality of superlens unit groups 21, each superlens unit group 21 includes at least one superlens array 20, and different superlens unit groups 21 are used to converge light rays emitted from the light emitting units 101 corresponding to the positions to positions of different depths. The collimating lens 30 is located at the light-emitting side of the superlens array 20, and is used for collimating the light emitted from the superlens array 20.
In the embodiment of the present invention, the light emitting array 10 includes a plurality of light emitting units 101, and the plurality of light emitting units 101 are arranged in an array manner, for example, in a form of a square matrix such as 5 × 5, 6 × 6, etc. Each light emitting unit 101 is capable of emitting light toward the superlens array 20 located at its light emitting side. The superlens array 20 is similar to the light emitting array 10, and includes a plurality of superlens units 201, and the superlens units 201 are arranged in an array. The light emitting units 101 correspond to the superlens units 201 in position, for example, a plurality of light emitting units 101 correspond to one superlens unit 201, or the two units are in a one-to-one correspondence relationship.
The superlens unit 201 has a function of converging light. In the present embodiment, the superlens units 201 in the superlens array 20 are divided into a plurality of groups, each of which is referred to as one superlens unit group 21. Since each superlens unit 201 corresponds to a corresponding light emitting unit 101, each superlens unit group 21 also has a light emitting unit 101 corresponding in position. As shown in fig. 1, the light emitting units 101 are in one-to-one correspondence with the positions of the superlens units 201, and every three superlens units 201 form a superlens unit group 21; accordingly, there are three light emitting units 101 corresponding to each superlens unit group 21. In fig. 1, the superlens array 20 includes three superlens unit groups 21, and all the light emitting units 101 may be divided into three groups; for convenience of description, the present embodiment refers to a set of the light emitting cells 101 corresponding to the superlens cell group 21 as the light emitting cell group 11, and the light emitting cell groups 11 are in one-to-one correspondence with the superlens cell group 21.
For each superlens unit group 21, the superlens units 201 therein are used for converging the light emitted from the light emitting unit 101, and all superlens units 201 in one superlens unit group 21 converge the light to the same position. Also, the positions to which the different superlens unit groups 21 converge have different depths, which may represent the axial distances of the superlens array 20; that is, different superlens unit groups 21 are used to converge the light rays to different distances from the superlens array 20. As shown in fig. 1, the superlens array 20 includes three superlens unit groups 21; the uppermost superlens unit group 21 can converge the light emitted from the light emitting unit 101 to the position F 1 Intermediate superlens unit group21 are capable of converging light rays emitted from the light emitting unit 101 to a position F 2 The lowermost superlens unit group 21 can converge the light emitted from the light emitting unit 101 to a position F 3 . As shown in FIG. 1, the three locations have different depths, and F 3 Corresponding depth minimum, F 2 The corresponding depth is maximum.
The collimating lens 30 can collimate the light converged by the superlens unit group 21, so that the light source module can emit collimated light. Generally, each superlens unit group 21 corresponds to a plurality of light emitting units 101, and the collimating lens 30 can collimate the light emitted by the light emitting units 101 and emit light obtained by combining a plurality of light beams, so the light emitted by the light source module is referred to as combined light in this embodiment. Alternatively, as shown in FIG. 1, the collimating lens 30 may be a conventional refractive lens; alternatively, as shown in fig. 2, the collimating lens 30 may also be a superlens, and the superlens-type collimating lens 30 has the characteristic of being light and thin, so that the size and weight of the light source module can be reduced, and the light source module is favorably miniaturized and lightened. Alternatively, the superlens unit 201 and the collimator lens 30 are both superlenses capable of achromatization, so that the imaging effect can be improved.
In the embodiment of the utility model, this light source module can be applied to in the projected scene of retina. Since the superlens array 20 can be divided into a plurality of superlens unit groups 21, each superlens unit group 21 can converge the light emitted by the light-emitting unit 101 to positions with different depths, which is equivalent to adjusting the light-emitting light sources to positions with different depths; when the combined light collimated by the collimating lens 30 is used for imaging, based on the retina projection technology, combined light corresponding to different depths can be used for imaging, so that images with different depth information can be formed, retina 3D projection is realized, and images with different depth information can be formed.
The embodiment of the utility model provides a pair of light source module, luminescence unit 101 and super lens unit 201 are the array arrangement, and super lens unit 201 is divided into a plurality of super lens unit groups 21, and every super lens unit group 21 can converge the position to the different degree of depth with the light that corresponding luminescence unit 101 sent for this light source module can send the combination light that has the different degree of depth, can be applied to the retina projection (3D display) scene of many depths. Moreover, the super-lens array 20 is used for modulating the light-emitting unit 101, a micro-lens is not needed, the super-lens array 20 has the characteristic of being light and thin, the overall size of the light source module is small, the weight is light, and the light source module is more suitable for scenes such as wearable equipment and the like, and supports long-time use of a user.
Optionally, in order to ensure the modulation effect on each light-emitting unit 101, the light-emitting units 101 correspond to the superlens units 201 one to one, that is, only light emitted by one light-emitting unit 101 needs to be modulated by one superlens unit 201; in addition, the light emitting array 10 and the superlens array 20 are attached to each other, so that light emitted from the light emitting unit 101 is not incident on other adjacent superlens units 201, and mutual influence can be effectively avoided.
Alternatively, in order to enable color image formation, the light emitting array 10 includes a plurality of light emitting cells 101, each light emitting cell 101 being capable of emitting light of one of three primary colors (red, green, blue); moreover, in order to ensure that the combined light beams of different depths also include the light beams of three primary colors, for each superlens unit group 21, the light emitting unit 101 corresponding to the superlens unit group 21 includes at least one red light emitting unit, at least one green light emitting unit, and at least one blue light emitting unit.
The embodiment of the utility model provides an in, red luminescence unit is the luminescence unit 101 that can send red wave band light, correspondingly, green luminescence unit is the luminescence unit 101 that can send green wave band light, and blue luminescence unit is the luminescence unit 101 that can send blue wave band light. Each superlens unit group 21 corresponds to a red light emitting unit, a green light emitting unit, and a blue light emitting unit, so that light rays converged at different depth positions all include light rays of three primary colors.
As shown in FIG. 2, the light emitting units 101 are LEDs (light emitting diodes), and the light emitting array 10 includes three red light emitting units R1, R2, R3, three green light emitting units G1, G2, G3, and three blue light emitting units B1B2, B3; the light emitting array 10 is divided into three light emitting unit groups, and the light emitting unit group 11-1 includes light emitting units R1, G1, and B1, the light emitting unit group 11-2 includes light emitting units R2, G2, and B2, and the light emitting unit group 11-3 includes light emitting units R3, G3, and B3. Each light-emitting unit group corresponds to a superlens unit group 21, so that the light-emitting units are arranged at different depth positions F 1 、F 2 、F 3 Can be converged into light rays having three primary colors of red, green and blue.
On the basis of any of the above embodiments, all the superlens units 201 in the superlens unit group 21 have the same focal length, so that the superlens unit group 21 can achieve the same converging effect on the light rays emitted by the light-emitting units 101 at different positions, and converge all the light rays to the same point. The position to which the superlens unit group 21 converges the light is the focal position of the superlens unit group 21, and the focal positions corresponding to different focal lengths have different depths.
When the light source module is applied to retinal projection, since the retinal projection is scanned and imaged pixel by pixel, at a certain time point, only the light emitting unit 101 corresponding to one superlens unit group 21 may be required to operate, that is, only the light emitting unit 101 of one light emitting unit group 11 may be required to operate. In order to ensure the uniformity of the brightness, the superlens cells 201 in the same superlens cell group 21 are arranged alternately. By staggering the superlens cells 201 in each superlens cell group 21, the lighted light emitting cells 101 can be also staggered, and brightness uniformity can be ensured.
Referring to fig. 3, fig. 3 shows a 6 × 6 super lens array 20, all the super lens units 201 are divided into 6 groups, that is, 6 super lens unit groups 21 are included, and the focal lengths of the 6 super lens unit groups 21 are f 1 、f 2 、f 3 、f 4 、f 5 、f 6 By staggering the superlens units 201, each divided group of the light emitting units 101 is also staggered. As shown in fig. 3, focal length f 1 The 6 superlens units 201 in the corresponding superlens unit group 21 are staggered and can be uniformly distributed in the superlens array 20; accordingly, with a focal length of f 1 The light emitting units 101 corresponding to the positions of the superlens unit 201 are also arranged in a staggered manner. The whole light emitting array 10 can emit light with uniform brightness, so that the imaging effect can be improved, and the uniform imaging brightness is ensured.
Optionally, the superlens unit 201 is a focus adjustable superlens, and the focal lengths of all superlens units 201 in the superlens unit group 21 are synchronously adjustable.
The embodiment of the utility model provides an in, every focus of surpassing lens unit 201 is adjustable, and it has multiple focus to surpass lens unit 201 to correspond promptly, and correspondingly, surpass lens unit group 21 and also correspond multiple focus, consequently, surpass lens unit group 21 and can converge the position of the multiple different degree of depth with the light that luminescence unit 101 sent one to make the more combination light of degree of depth of this light source module can be emergent, can satisfy more become more meticulous, complicated formation of image demand. Alternatively, in the case where the required number of depths is not changed, fewer light emitting units 101 and superlens units 201 may be used, and the volume and weight of the light source module may be further reduced.
Alternatively, in order to realize combined light rays of a plurality of depths as much as possible, any focal length corresponding to each superlens unit group 21 and any focal length corresponding to the other superlens unit groups 21 are different from each other. Specifically, in the case of i ≠ j, f i,u ≠f j,v 。
Wherein f is i,u Denotes the u-th focal length, f, modulated by the i-th superlens unit group 21 j,v Represents the v-th focal length modulated by the j-th superlens unit group 21; i. the value range of j is [1, N ]]U and v have a value range of [1, M ]]N indicates the number of superlens unit groups 21 included in the superlens array 20, and M indicates the number of focal length types that can be modulated by the superlens unit groups 21. As will be appreciated by those skilled in the art, i, j, u, v are all positive integers.
In the embodiment of the present invention, the superlens unit 201 is divided into N groups, that is, the superlens array 20 includes N superlens unit groups 21, and the light emitting array 10 includes N light emitting unit groups 11; if the focal length of the superlens unit 201 is not adjustable, the light source module can only provide N different depths; as shown in fig. 3As shown, N =6, the light source module can only provide 6 depths. In the embodiment of the present invention, the focal length of the superlens unit 201 is adjustable, if each superlens unit group 21 can realize M focal lengths, and f i,u ≠f j,v The light source module can provide N × M depths, thereby greatly increasing the number of the depth types.
For example, referring to fig. 4, the superlens array 20 is divided into four groups a, B, C, and D, i.e., four groups of superlens units 21, n =4; if the superlens units 201 in each superlens unit group 21 can be modulated to 6 different focal lengths, i.e., M =6, the light source module can provide 24 depths. For example, at a certain time, the light-emitting units 101 corresponding to the D-group superlens unit group 21 may be selected to be turned on, and the focal length of the superlens unit 201 of the D-group may be adjusted to f D,2 The light source module can provide a depth f D,2 The combined light of (1).
In addition, since the light emitting units 101 of the light emitting array 10 are divided into N groups, only one group of the light emitting units 101 needs to be lighted at a certain time, so the utilization efficiency of the light emitting array 10 is 1/N. The adjustable-focal-length superlens array 20 can also improve the use efficiency of the light emitting unit 101. As shown in fig. 3, in order to form light beams of 6 different depths, if the focal length of the superlens unit 201 is fixed, the light emitting array 10 and the superlens array 20 need to be divided into 6 groups, and the use efficiency of the light emitting array 10 is 1/6. If the superlens unit 201 can be switched between two focal lengths (i.e. M = 2), only three superlens unit sets 21 or three light-emitting unit sets 11 are needed, so the utilization efficiency of the light-emitting array 10 is 1/3; alternatively, the superlens unit 201 can be switched between three focal lengths (i.e. M = 3), and only two superlens unit groups 21 or two light-emitting unit groups 11 are needed, and the usage efficiency of the light-emitting array 10 is 1/2.
Optionally, the superlens unit 201 utilizes the adjustable phase change state of the phase change material to realize the modulation of the focal length. Specifically, the superlens unit 201 includes an excitation element and a phase change element 2013 made of a phase change material.
An actuation element for applying an actuation to phase change element 2013; the phase change element 2013 can change a phase change state under the action of excitation, so that the superlens unit 201 changes a modulation effect on incident light, and the focal length of the superlens unit 201 is adjusted.
The embodiment of the utility model provides an in, this phase change element 2013 is made by phase change material, utilizes phase change material can change its phase transition state's characteristics under the excitation, can change this phase transition element 2013's phase transition state under the excitation that the excitation component applyed to can change this modulation effect of surpassing lens unit 201, and then change the focus of surpassing lens unit 201. The phase change material is a material capable of realizing crystalline state and amorphous state conversion; for example, the phase change material may be germanium antimony telluride (Ge) X SB Y TE Z ) Germanium telluride (Ge) X TE Y ) Antimony telluride (Sb) X TE Y ) Silver antimony telluride (Ag) X SB Y TE Z ) And the like. For example, the phase change material is GST (Ge) 2 SB 2 TE 5 ) By applying voltage and the like, the crystalline state of the phase change material can be realized
Fast conversion of the amorphous state, thereby realizing two focal lengths; furthermore, partial crystallization can be realized, so that the phase change material is in one state between a crystalline state and an amorphous state, and more focal lengths can be realized.
Alternatively, referring to fig. 5, the actuation element includes a first electrode layer 2011 and a second electrode layer 2012, the phase change element 2013 is a layered structure, and the superlens cell 201 further includes a substrate 2014 and at least one nanostructure 2015. The nanostructures 2015 and the first electrode layer 2011 are both disposed on the same side of the substrate 2014, and the first electrode layer 2011 fills around the nanostructures 2015; the height of the first electrode layer 2011 is less than the height of the nanostructures 2015; the phase change element 2013 is located on the side of the first electrode layer 2011 away from the substrate 2014, and is filled around the nanostructure 2015; the sum of the heights of first electrode layer 2011 and phase change element 2013 is greater than the height of nanostructure 2015; the second electrode layer 2012 is located on the side of the phase change element 2013 away from the first electrode layer 2011; the first electrode layer 2011 and the second electrode layer 2012 are used to apply voltages to the phase change element 2013.
In the embodiment of the present invention, the substrate 2014 and the nanostructures 2015 arranged on one side thereof form a basic super surface, and the first electrode layer 2011 and the second electrode layer 2012 are disposed on two sides of the phase change element 2013, and different voltages are applied to the first electrode layer 2011 and the second electrode layer 2012 to form a voltage difference, so that an electrical excitation can be applied to the phase change element 2013 made of the phase change material, thereby changing the phase change state of the phase change element 2013; different voltage differences correspond to different electrical stimuli and may correspond to different focal lengths. The first electrode layer 2011 and the phase change element 2013 are filled around the nanostructure 2015, and the phase change state of the phase change element 2013 is changed to change the equivalent refractive index of the nanostructure 2015, so that the phase modulation effect of the superlens unit 201 is changed, and the overall focal length of the superlens unit 201 can be changed. The sum of the heights of the first electrode layer 2011 and the phase change element 2013 is greater than the height of the nanostructure 2015, so that the second electrode layer 2012 is spaced from the nanostructure 2015 by a certain distance, the nanostructure 2015 can be prevented from contacting the second electrode layer 2012, and the nanostructure 2015 can be prevented from leaking electricity. The first electrode layer 2011, the second electrode layer 2012 and the substrate 2014 are transparent in an operating band, which may specifically include a visible light band.
The embodiment of the present invention further provides a retina projection system, as shown in fig. 6, the retina projection system includes: the light source module and the scanning mirror 40 provided in any of the above embodiments; the light source module is used for emitting combined light corresponding to each pixel; the scanning mirror 40 is located on the light-emitting side of the light source module, and is used for scanning the combined light to generate a scanning light field of an image at the observation position.
In the embodiment of the present invention, as shown in fig. 6, the light emitting array 10 of the light source module can emit light, the light is modulated by the superlens array 20 to generate light a with different focusing distances, and then is collimated by the collimating lens 30 to generate a combined light beam B emitted to the scanning mirror 40; the light source module can emit combined light corresponding to each pixel by pixel according to the requirement of retina projection. The scanning mirror 40 scans the combined light beam B, so as to generate a scanning light beam C capable of projection imaging, and the scanning light beam C finally reaches a viewing position (for example, a position where the human eye is located), passes through the pupil 1 of the human eye at the viewing position, penetrates through the crystalline lens 2, and finally forms an image at the retina 3 of the human eye, so as to realize retina projection imaging. For example, the scanning mirror 40 may be a MEMS galvanometer including a plurality of MEMS mirrors 41. The scanning mirror 40 is a mature solution in the retinal projection imaging technology, and is not described in detail herein.
Optionally, as shown in fig. 6, the retinal projection system further includes: a mirror 50; the reflecting mirror 50 is located on the light-emitting side of the scanning mirror 40, and is used for reflecting the combined light emitted from the scanning mirror 40 to the observation position. As shown in fig. 6, the reflector 50 may be a curved reflector; alternatively, as shown in FIG. 7, the mirror 50 can be a super-surface to further reduce the size and weight of the retinal projection system.
Alternatively, the retinal projection system can be applied in an AR scene, in which case the mirror 50 can also transmit at least part of the light rays in the visible band in order to enable the user to see something outside; for example, the mirror 50 may be a transflective element having a transflective function. Also, referring to fig. 8, the retinal projection system further includes a phase compensator 60. Wherein the phase compensator 60 is located on a side of the reflection mirror 50 far away from the scanning mirror 40, and the phase compensator 60 is used for performing phase compensation on at least part of the light rays in the visible light wave band transmitted through the phase compensator 60, so that at least part of the light rays in the visible light wave band transmitted through the reflection mirror 50 and the phase compensator 60 are aberration-free.
In the embodiment of the present invention, under the reflection action of the reflector 50, the scanning beam C can be reflected to the retina 3, so that the user can watch the scanned image. Moreover, since the reflector 50 and the phase compensator 60 can transmit at least part of light in a visible light band, at least part of the ambient light D can sequentially transmit through the phase compensator 60 and the reflector 50 and then reach human eyes, so that a user can view the external environment.
In addition, since the mirror 50 has a certain modulation effect on light, ambient light directly transmitted through the mirror 50 is subject to aberration, which results in distortion of the external environment seen by the user. The embodiment of the utility model provides an in, utilize phase compensator 60 to carry out phase compensation to ambient light for phase compensator 60 and speculum 50 can form the afocal system, and ambient light still is aberration-free after seeing through this phase compensator 60, speculum 50, and the user can normally watch external environment. For example, the sum of the phase modulated by the phase compensator 60 and the phase corresponding to the mirror 50 is 2 π. The phase compensator 60 can also be implemented based on a super-surface technology, for example, the phase compensator 60 is a super-lens with a desired phase distribution.
Alternatively, both the mirror 50 and the phase compensator 60 are super-surface and can be achromatic. In this embodiment, the mirror 50 and the phase compensator 60 may be super-surfaces capable of achromatizing, the mirror 50 is capable of eliminating chromatic aberration of the scanning beam C, and the phase compensator 60 is capable of eliminating chromatic aberration of the ambient light D.
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 (16)
1. A light source module, comprising: a light emitting array (10), a superlens array (20) and a collimating lens (30); the light emitting array (10) comprises a plurality of light emitting units (101) arranged in an array, and the super lens array (20) comprises a plurality of super lens units (201) arranged in an array;
the light emitting units (101) in the light emitting array (10) are used for emitting light;
the superlens array (20) is positioned on the light-emitting side of the light-emitting array (10); the superlens array (20) comprises a plurality of superlens unit groups (21), each superlens unit group (21) comprises at least one superlens unit (201), and different superlens unit groups (21) are used for converging light rays emitted by the corresponding light-emitting units (101) to different depths;
the collimating lens (30) is located on the light-emitting side of the super lens array (20) and is used for collimating the light emitted by the super lens array (20).
2. The light source module according to claim 1, wherein the light emitting array (10) and the super lens array (20) are attached to each other, and the light emitting units (101) correspond to the super lens units (201) one to one.
3. The light source module according to claim 1, wherein the light emitting units (101) corresponding to the superlens unit group (21) comprise at least one red light emitting unit, at least one green light emitting unit and at least one blue light emitting unit.
4. The light source module according to claim 1, wherein the superlens units (201) in the same superlens unit group (21) are staggered.
5. The light source module according to claim 1, wherein the collimating lens (30) is a superlens.
6. The light source module according to claim 5, wherein the superlens unit (201) and the collimating lens (30) are both achromatic superlenses.
7. The light source module according to any one of claims 1-6, wherein all superlens units (201) in the superlens unit group (21) have the same focal length.
8. The light source module according to claim 7, wherein the superlens unit (201) is a focus adjustable superlens, and the focal lengths of all superlens units (201) in the superlens unit group (21) are synchronously adjustable.
9. The light source module according to claim 8, wherein the superlens unit (201) comprises an excitation element and a phase change element (2013) made of a phase change material;
the actuation element is for applying an actuation to the phase change element (2013); the phase change element (2013) can change a phase change state under the action of the excitation, so that the superlens unit (201) changes a modulation effect on incident light rays, and the focal length of the superlens unit (201) is adjusted.
10. The light source module according to claim 9, wherein the actuation element comprises a first electrode layer (2011) and a second electrode layer (2012), the phase change element (2013) is a layered structure, and the superlens cell (201) further comprises a substrate (2014) and at least one nanostructure (2015);
the nanostructures (2015) and the first electrode layer (2011) are both disposed on the same side of the substrate (2014), and the first electrode layer (2011) fills around the nanostructures (2015); the height of the first electrode layer (2011) is less than the height of the nanostructures (2015);
the phase change element (2013) is positioned on the side, away from the substrate (2014), of the first electrode layer (2011) and is filled around the nano-structure (2015); the sum of the heights of the first electrode layer (2011) and the phase change element (2013) is greater than the height of the nanostructure (2015);
the second electrode layer (2012) is located on a side of the phase change element (2013) remote from the first electrode layer (2011); the first electrode layer (2011) and the second electrode layer (2012) are used to apply a voltage to the phase change element (2013).
11. The light source module as claimed in any one of claims 8-10, wherein f is ≠ j i,u ≠f j,v ；
Wherein f is i,u Denotes the firstThe u-th focal length, f, modulated by the i superlens unit groups (21) j,v Represents the v-th focal length modulated by the j-th superlens unit group (21); i. the value range of j is [1, N ]]U and v are in the range of [1, M ]]N represents the number of the super lens unit groups (21) included in the super lens array (20), and M represents the number of focal length types that can be modulated by the super lens unit groups (21).
12. A retinal projection system, comprising: the light source module and the scanning mirror (40) of any one of claims 1-11;
the light source module is used for emitting combined light corresponding to each pixel;
the scanning mirror (40) is located on the light emitting side of the light source module and used for scanning the combined light rays so as to generate a scanning light field of an image at an observation position.
13. The retinal projection system of claim 12, further comprising: a mirror (50);
the reflecting mirror (50) is located on the light emergent side of the scanning mirror (40) and used for reflecting the combined light emitted by the scanning mirror (40) to the observation position.
14. The retinal projection system of claim 13, wherein the mirror (50) is a curved mirror or a super surface.
15. The retinal projection system of claim 14, wherein the mirror (50) is further transmissive for at least some light rays in the visible wavelength band; and the retinal projection system further comprises a phase compensator (60);
the phase compensator (60) is located on the side of the mirror (50) away from the scanning mirror (40), and the phase compensator (60) is used for performing phase compensation on at least part of the light rays in the visible light wave band which are transmitted, so that at least part of the light rays in the visible light wave band which are transmitted through the phase compensator (60) and the mirror (50) are free of aberration.
16. The retinal projection system according to claim 15, characterized in that the mirror (50) and the phase compensator (60) are both super-surfaces and can be achromatic.
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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
- 2022-07-25 CN CN202221923866.6U patent/CN217639776U/en active Active
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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