LED light beam shaping system, array type LED light beam shaping system and display module
The superlens with micro-nano structures addresses the bulkiness and heaviness of refractive lenses by providing smaller, lighter, and more flexible LED beam shaping, enabling complex light intensity distributions without additional components.
Patent Information
- Application Number
- CN202421108476.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-21
AI Technical Summary
Existing LED beam shaping systems using refractive lenses are bulky and heavy, limiting miniaturization and lightweight design due to limited modulation freedom and the need for additional optical elements to meet complex light intensity distribution requirements.
The use of a superlens with micro-nano structures on a substrate to shape LED light beams, allowing for smaller volume and weight, and higher modulation freedom through adjustable micro-nano structure material, shape, and aspect ratio, without requiring additional optical elements.
The superlens-based system effectively reduces system volume and weight while achieving complex light intensity distributions, facilitating miniaturization and lightweight design.
Smart Images
Figure CN222280962U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optics, and in particular to an LED beam shaping system, an array LED beam shaping system and a display module. Background Art
[0002] Light-Emitting Diode (LED) light sources are widely used in the fields of lighting, image display, etc. In many applications in these fields, the light beam emitted by the LED light source is often required to present a specific light intensity distribution to meet specific application requirements. To this end, a specific optical modulation element is required to shape the light beam emitted by the LED light source so that the shaped light beam can present a specific light intensity distribution. The system for shaping the light beam emitted by the LED light source provided in the related art is not conducive to the miniaturization and lightweight of the system. Utility Model Content
[0003] One purpose of the present application is to propose an LED beam shaping system, an array LED beam shaping system and a display module. The LED beam shaping system provided by the present application can effectively reduce the volume and weight of the system, thereby being more conducive to the miniaturization and lightweight of the system.
[0004] According to one aspect of an embodiment of the present application, an LED beam shaping system is disclosed, the LED beam shaping system comprising: an LED light source and a metalens for shaping a light beam emitted by the LED light source;
[0005] The superlens includes a substrate and a micro-nano structure arranged on the surface of the substrate; the micro-nano structures on the same surface have consistent heights; the ratio of the height of any micro-nano structure divided by its cross-sectional diameter is less than or equal to 30; the vertical projection of the LED light source on the plane where the superlens is located and the center of the superlens are less than or equal to 75 μm.
[0006] In an exemplary embodiment of the present application, the micro-nano structure is disposed on the rear surface of the substrate; the rear surface of the substrate faces away from the LED light source.
[0007] In an exemplary embodiment of the present application, the light beam shaped by the LED beam shaping system is projected onto a predetermined target plane; the distance from the LED light source array to the target plane is the total distance required for the LED beam shaping system to work;
[0008] The distance between the surface where the micro-nano structure is located and the LED light source is greater than or equal to the thickness of the substrate, and less than or equal to one half of the total distance.
[0009] In an exemplary embodiment of the present application, the micro-nano structure is disposed on the front surface of the substrate; and the front surface of the substrate faces the LED light source.
[0010] According to one aspect of an embodiment of the present application, an array-type LED beam shaping system is disclosed, and the array-type LED beam shaping system includes at least two LED beam shaping systems provided by any one of the above embodiments; in the array-type LED beam shaping system, the light emission positions of all the LED light sources are coplanar, and the light incident positions of all the metalenses are coplanar.
[0011] According to one aspect of an embodiment of the present application, a display module is disclosed, the display module comprising: a substrate; an array-type LED beam shaping system as provided in the above embodiment; a display screen;
[0012] Among them, all the LED light sources in the array-type LED beam shaping system are arranged on the substrate, and all the super lenses in the array-type LED beam shaping system are arranged between the substrate and the display screen; each super lens in the array-type LED beam shaping system is used to homogenize the light beam emitted by the associated LED light source.
[0013] In an exemplary embodiment of the present application, all the metalenses in the arrayed LED beam shaping system share the substrate.
[0014] In an exemplary embodiment of the present application, the display module also includes: a supporting layer that is transparent in the working band of the light beam emitted by the LED light source; the supporting layer is parallel to the display screen; and all the super lenses in the array LED beam shaping system are arranged on the supporting layer.
[0015] In an exemplary embodiment of the present application, a reflective layer is provided on the substrate at least in a region surrounding the LED light source.
[0016] In an exemplary embodiment of the present application, a first optical modulation element is provided between the array-type LED beam shaping system and the display screen, and the first optical modulation element includes at least one of the following: a diffusion element; an anti-reflection element.
[0017] The LED beam shaping system provided by the present application uses a super lens to shape the light beam emitted by the LED light source. Compared with a refractive lens, a super lens has a smaller volume and weight. In addition, since the super lens can adjust the modulation effect applied to the light beam by regulating the material, shape, aspect ratio, etc. of its micro-nano structure, the super lens has a higher degree of modulation freedom than the refractive lens. Therefore, even if the requirements for the specific light intensity distribution that the light beam should present are more complex, the embodiments of the present application do not need to continue to introduce more optical modulation elements on the basis of the original system, and will not cause the volume and weight of the system to increase further. It can be seen that the LED beam shaping system provided by the present application can effectively reduce the volume and weight of the system, thereby being more conducive to the miniaturization and lightweight of the system.
[0018] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.
[0019] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
[0021] Figure 1 A schematic diagram of the architecture of the LED beam shaping system provided in the present application is shown.
[0022] Figure 2 A schematic diagram showing the relative positions of the LED light source and the metalens in the LED beam shaping system provided in the present application is shown.
[0023] Figure 3 A schematic diagram of the architecture of an LED beam shaping system in an embodiment of the present application is shown.
[0024] Figure 4 The normalized light intensity distribution of the light spot projected by the LED beam shaping system on the target plane in one embodiment of the present application is shown.
[0025] Figure 5 Shows Figure 4 The normalized light intensity distribution of the light spot in the radial direction is shown.
[0026] Figure 6 The schematic diagram of the architecture of the array LED beam shaping system provided in the present application is shown.
[0027] Figure 7 A schematic diagram of the structure of the display module provided in this application is shown.
[0028] Figure 8 A schematic diagram of the structure of a display module in an embodiment of the present application is shown.
[0029] Fig. 9 A schematic diagram of the structure of a display module in an embodiment of the present application is shown.
[0030] Fig.10 A schematic diagram of the structure of a display module in an embodiment of the present application is shown.
[0031] Fig.11 A schematic diagram of the structure of a display module in an embodiment of the present application is shown.
[0032] Reference numerals:
[0033] 1-LED light source; 2-super lens; 2a-substrate; 2b-micro-nano structure; 3-observation screen; 4-target plane; 5-substrate; 6-display screen; 7-support layer; 8-reflection layer; 9-first optical modulation element. DETAILED DESCRIPTION
[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present application will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.
[0035] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present application. However, those skilled in the art will appreciate that the technical solution of the present application may be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. may be adopted. In other cases, known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring the present application and making the various aspects of the present application obscure.
[0036] In the related art, refractive lenses (such as Powell lenses, aspheric lenses, etc.) are often used to shape the light beam emitted by the LED light source. On the one hand, the use of refractive lenses will cause the volume and weight of the system to be relatively large. On the other hand, the degree of freedom of modulation of the light beam by the refractive lens is very limited. Usually, the modulation effect of the refractive lens on the light beam can only be adjusted by adjusting the material or curvature radius of the refractive lens. Therefore, once the requirements for the specific light intensity distribution that the light beam should present are slightly more complicated, it is difficult to obtain a shaping effect that meets the complex requirements by simply adjusting the material or curvature radius of the original refractive lens in the system. In this case, in order to obtain a shaping effect that meets the complex requirements, more refractive lenses or other optical modulation elements can only be added to the system, and this method will cause the volume and weight of the system to further increase, which is not conducive to the miniaturization and lightweight of the system.
[0037] In order to overcome the above-mentioned defects in the related art, the present application provides an LED beam shaping system. The LED beam shaping system provided by the present application can effectively reduce the volume and weight of the system, thereby being more conducive to the miniaturization and lightweight of the system.
[0038] Figure 1 A schematic diagram of the architecture of the LED beam shaping system provided in the present application is shown. Figure 2 A schematic diagram showing the relative positions of the LED light source and the metalens in the LED beam shaping system provided in the present application is shown.
[0039] See also Figure 1 as well as Figure 2 The LED beam shaping system provided in the present application includes: an LED light source 1 and a super lens 2 for shaping the light beam emitted by the LED light source 1.
[0040] In the embodiment of the present application, the light beam emitted by the LED light source 1 is irradiated on the superlens 2, so the superlens 2 shapes the light beam emitted by the LED light source 1. If an observation screen 3 is set on the light-emitting side of the superlens 2, the light beam shaped by the superlens 2 will be projected on the observation screen 3 to obtain a corresponding light spot. By observing the light intensity distribution of the light spot, the light intensity distribution of the light beam shaped by the superlens 2 can be confirmed; the light intensity distribution of the light beam shaped by the superlens 2 is the light intensity distribution output by the LED beam shaping system.
[0041] It should be noted that the light intensity distribution output by the LED beam shaping system can be mainly described from the following two aspects: 1. The geometric shape of the light spot obtained by projecting the light beam output by the LED beam shaping system on a specific plane; 2. The relative size of the light intensity at each position inside the light spot obtained by projecting the light beam output by the LED beam shaping system on a specific plane. Depending on the specific application requirements, the geometric shape of the light spot obtained by projecting the light beam output by the LED beam shaping system on a specific plane includes but is not limited to: rectangle, circle, triangle; the relative size of the light intensity at each position inside the light spot obtained by projecting the light beam output by the LED beam shaping system on a specific plane includes but is not limited to: the relative size of the light intensity at each position remains uniform and consistent; the light intensity at a specific position is greater than the light intensity at other positions.
[0042] In the embodiment of the present application, the superlens 2 includes a substrate 2a and a superstructure unit arranged on the surface of the substrate 2a, and a micro-nanostructure 2b is provided at the vertex and / or center of the superstructure unit; the filling material between the micro-nanostructures 2b is air or other materials that are transparent in the working band.
[0043] The micro-nano structures 2b on the same surface have the same height; while different micro-nano structures 2b may have cross sections of different sizes. The cross-sectional diameter of the micro-nano structure 2b refers to the diameter of the circumscribed circle corresponding to the cross section of the micro-nano structure 2b. The ratio obtained by dividing the height of the micro-nano structure 2b by the cross-sectional diameter of the micro-nano structure 2b is the aspect ratio of the micro-nano structure 2b. In the embodiment of the present application, the aspect ratio of any micro-nano structure 2b is less than or equal to 30 to ensure that the micro-nano structure 2b in the superlens 2 has good processability.
[0044] The center of LED light source 1 is A1, the vertical projection of A1 on the plane where metalens 2 is located is A2, and the center of metalens 2 is B2. It should be noted that, in order to facilitate the phase design of metalens 2, it is usually necessary to ensure that the light intensity distribution received by metalens 2 is symmetrical about the center of metalens 2; and, in theory, the light intensity distribution of the light beam emitted by LED light source 1 is symmetrical about the center of LED light source 1. Therefore, in theory, in order to ensure that the light intensity distribution received by metalens 2 is symmetrical about the center of metalens 2, the distance between the vertical projection A2 corresponding to LED light source 1 and the center B2 of metalens 2 should be 0; that is, in theory, the centers of LED light source 1 and metalens 2 should be directly opposite each other.
[0045] However, in fact, due to the existence of processing errors, the light intensity distribution of the light beam emitted by the LED light source 1 is usually not strictly symmetrical about the center of the LED light source 1. Therefore, in this case, when the centers of the LED light source 1 and the super lens 2 are facing each other, the light intensity distribution received by the super lens 2 is not symmetrical about the center of the super lens 2.
[0046] Therefore, in the embodiment of the present application, for the LED light source 1 and the metalens 2, on the basis that the centers of the two are facing each other, a certain offset is applied to the relative position between the centers of the two, so as to make the light intensity distribution received by the metalens 2 symmetrical about the center of the metalens 2 as much as possible. In addition, when assembling the LED light source 1 and the metalens 2, a certain assembly tolerance is usually introduced. Therefore, combined with the offset applied to the relative position between the centers of the LED light source 1 and the metalens 2, and the assembly tolerance, in the embodiment of the present application, the vertical projection A2 of the center A1 of the LED light source 1 on the plane where the metalens 2 is located is controlled to be less than or equal to 75μm, and the distance between the center B2 of the metalens 2 is controlled to be less than or equal to 75μm, thereby facilitating the phase design of the metalens 2 and allowing a reasonable range of assembly tolerance. Preferably, when the processing error of the LED light source 1 and the assembly error of the system can be effectively reduced, the distance between A2 and B2 is controlled to be less than or equal to 40μm; further preferably, the distance between A2 and B2 is controlled to be less than or equal to 25μm.
[0047] It should be noted that the LED beam shaping system provided by the present application uses a super lens 2 to shape the light beam emitted by the LED light source 1. Compared with the refractive lens, the super lens 2 has a smaller volume and weight. In addition, since the super lens 2 can adjust the modulation effect applied to the light beam by regulating the material, shape, aspect ratio, etc. of its micro-nano structure, the super lens 2 has a higher degree of modulation freedom than the refractive lens. Therefore, even if the requirements for the specific light intensity distribution that the light beam should present are more complex, the embodiment of the present application does not need to continue to introduce more optical modulation elements on the basis of the original system, and will not cause the volume and weight of the system to increase further. It can be seen that the LED beam shaping system provided by the present application can effectively reduce the volume and weight of the system, which is more conducive to the miniaturization and lightweight of the system.
[0048] Figure 3 FIG. 1 is a schematic diagram showing the architecture of an LED beam shaping system in an embodiment of the present application. Figure 3 In one embodiment, the micro-nano structure 2 b is disposed on the rear surface of the substrate 2 a ; the rear surface of the substrate 2 a faces away from the LED light source 1 .
[0049] When the micro-nano structure 2b is disposed on the rear surface of the substrate 2a, the light beam emitted by the LED light source 1 will first pass through the substrate 2a before reaching the micro-nano structure 2b, and will be refracted when entering the substrate 2a. The occurrence of refraction will reduce the incident angle of the light beam when entering the micro-nano structure 2b to a certain extent, which is conducive to the micro-nano structure 2b to modulate the light beam.
[0050] See also Figure 3In one embodiment, a corresponding projection object, namely, a target plane 4, is predetermined for the LED beam shaping system. Depending on the application requirements, the target plane 4 may be a display screen of an electronic device or a specific optical modulation device. After the target plane 4 is determined, the total distance required for the LED beam shaping system to work is determined as the distance from the LED light source 1 to the target plane 4.
[0051] like Figure 3 As shown, the center of the LED light source 1 is A1, and a projection point A4 is obtained by vertically projecting A1 onto the target plane 4. Therefore, the total distance required for the LED beam shaping system to work is the distance from A1 to A4.
[0052] It should be noted that, in many cases, the LED beam shaping system must give priority to ensuring the light energy utilization rate of the light beam emitted by the LED light source 1. Therefore, under the constraint of light energy utilization rate, the larger the distance between the surface where the micro-nano structure 2b is located (in this embodiment, the rear surface of the substrate 2a) and the LED light source 1, the larger the size of the superlens 2, resulting in a higher cost of the superlens 2. In addition, if the LED beam shaping system also needs to ensure that the coverage of the light beam shaped by the superlens 2 on the target plane 4 remains unchanged, and the total distance required for the LED beam shaping system to work remains unchanged, then the larger the distance between the surface where the micro-nano structure 2b is located and the LED light source 1, the smaller the distance between the surface where the micro-nano structure 2b is located and the target plane 4, so the superlens 2 needs to provide a larger deflection angle for the light beam, thereby increasing the design difficulty of the superlens 2.
[0053] Therefore, in this embodiment, the distance between the rear surface of the substrate 2a and the LED light source 1 is controlled to be greater than or equal to the thickness of the substrate 2a, and less than or equal to one half of the total distance required for the LED beam shaping system to work. In this way, the cost of the metalens 2 is avoided from being too high, and the design difficulty of the metalens 2 is avoided from being too high.
[0054] In detail, in this embodiment, since the micro-nano structure 2b is disposed on the rear surface of the substrate 2a, the distance between the surface where the micro-nano structure 2b is located and the LED light source 1 is at least equal to the thickness of the substrate 2a. When the distance between the surface where the micro-nano structure 2b is located and the LED light source 1 is equal to the thickness of the substrate 2a, the superlens 2 can be directly processed on the LED light source 1; in this case, the light emitting surface of the LED light source 1 is in contact with the front surface of the substrate 2a.
[0055] Figure 3 In the figure, A0 is the midpoint of the line between A1 and A4; that is, the distance from A1 to A0 is half of the total distance required for the LED beam shaping system to work. Therefore, in this embodiment, the surface where the micro-nano structure 2b is located can be located at the farthest position of A0.
[0056] Preferably, in one embodiment, the distance between the rear surface of the substrate 2a and the LED light source 1 is controlled to be greater than or equal to the thickness of the substrate 2a, and less than or equal to one third of the total distance required for the LED beam shaping system to work.
[0057] In one embodiment, the micro-nano structure 2 b is disposed on the front surface of the substrate 2 a ; the front surface of the substrate 2 a faces the LED light source 1 .
[0058] In one embodiment, the central wavelength of the light beam emitted by the LED light source 1 is 455 nm; the LED light source 1 is a circular Lambertian surface light source with a diameter of 500 μm. The micro-nanostructure 2b in the superlens 2 is arranged on the rear surface of the substrate 2a; the distance between the rear surface of the substrate 2a and the LED light source 1 is 750 μm; the distance between the target plane 4 and the rear surface of the substrate 2a is 2250 μm; the divergence angle half angle of the target light intensity distribution in the radial direction of the target plane is 30°.
[0059] Figure 4 The normalized light intensity distribution of the light spot projected by the LED beam shaping system in this embodiment on the target plane is shown. Figure 5 Shows Figure 4 The normalized light intensity distribution of the light spot in the radial direction is shown.
[0060] See also Figures 4 to 5 In this embodiment, the LED beam shaping system projects a circular light spot on the target plane, and the circular light spot has excellent uniformity within a divergence angle half-angle range of 30° in the radial direction (ie, within a radial coordinate range of -602.85 μm to 602.85 μm).
[0061] The present application also provides an array-type LED beam shaping system. Figure 6 Schematic diagram of the structure of the array LED beam shaping system provided by the present application is shown. Figure 6 The array-type LED beam shaping includes at least two LED beam shaping systems provided by the above-mentioned embodiments. In the array-type LED beam shaping system, the light emission positions of all LED light sources 1 are coplanar and are all in plane P1; the light incident positions of all metalenses 2 are coplanar and are all in plane P2.
[0062] The array-type LED beam shaping system provided in the present application is obtained by duplicating and splicing the LED beam shaping system designed by any of the above-mentioned method embodiments. Therefore, by adopting the same beam shaping method as the LED beam shaping system, the array-type LED beam shaping system can expand the coverage of the target light intensity distribution.
[0063] Since the LED beam shaping system provided in the present application is conducive to the miniaturization and lightweight of the system, in the array-type beam shaping system, the array-type LED beam shaping system provided in the present application is also conducive to the miniaturization and lightweight of the system.
[0064] The present application also provides a display module. Figure 7 The schematic diagram of the structure of the display module provided by the present application is shown. Figure 7 The display module provided in the present application includes: a substrate 5; the array LED beam shaping system provided in the above embodiment; and a display screen 6.
[0065] In the display module provided in the present application, the substrate 5 at least provides support for all LED light sources 1 in the array-type LED beam shaping system, so all LED light sources 1 in the array-type LED beam shaping system are arranged on the substrate 5. At the same time, all metalenses 2 in the array-type LED beam shaping system are arranged between the substrate 5 and the display screen 6. Moreover, each metalenses 2 in the array-type LED beam shaping system is used to homogenize the light beam emitted by the associated LED light source 1.
[0066] Therefore, in the display module provided by the present application, each LED light source 1 disposed on the substrate 5 emits a light beam to the associated super lens 2, and the super lens 2 homogenizes the received light beam, thereby providing a homogenized light beam with highly uniform light intensity distribution to the display screen 6. When the display screen 6 is a liquid crystal display screen, the display module provided by the present application constitutes a type of backlight liquid crystal display module.
[0067] Since the array-type LED beam shaping system provided by the present application is conducive to the miniaturization of the system, when the array-type LED beam shaping system provided by the present application is arranged under the display screen 6, the demand for space under the display screen 6 is reduced, so the thickness of the display module provided by the present application can be reduced; at the same time, since the array-type LED beam shaping system provided by the present application is conducive to the lightweight of the system, the weight of the display module provided by the present application can also be reduced. In summary, it can be seen that the display module provided by the present application can be thinner and lighter.
[0068] In one embodiment, the substrate 5 is a printed circuit board PCB (Printed Circuit Board). In this embodiment, the substrate 5 not only provides support for all LED light sources 1 in the LED beam shaping system, but also provides electrical signals for all LED light sources 1.
[0069] Figure 8 Schematic diagram of the structure of the display module in one embodiment of the present application is shown. Figure 8In one embodiment, all the metalenses 2 in the array-type LED beam shaping system share a substrate 2a. By sharing the substrate 2a, all the metalenses 2 whose arrangement meets the requirements of the array-type LED beam shaping system can be directly processed on the whole wafer according to the arrangement of all the metalenses 2 in the array-type LED beam shaping system. Then, there is no need to cut each metalense 2 separately, but only to shape the edge of the whole wafer, and then set the whole wafer with the shaped edge at a position that should be kept away from the LED light source 1, and control each LED light source 1 to have a metalense 2 associated with it - the vertical projection of any LED light source 1 on the plane where the metalenses 2 is located, and the distance between the center of the associated metalenses 2 is less than or equal to 75μm.
[0070] Fig. 9 Schematic diagram of the structure of the display module in one embodiment of the present application is shown. Fig. 9 In one embodiment, the display module further includes: a support layer 7 which is transparent in the working band of the light beam emitted by the LED light source. The support layer 7 is parallel to the display screen 6 and is used to provide support for all the super lenses 2 in the LED beam shaping system. Therefore, all the super lenses 2 are arranged on the support layer 7.
[0071] Fig.10 Schematic diagram of the structure of the display module in one embodiment of the present application is shown. Fig.10 In one embodiment, a reflective layer 8 is provided on the substrate 5 at least in the area surrounding the LED light source 1. The reflective layer 8 has a high reflectivity for the light beam emitted by the LED light source 1.
[0072] It should be noted that although the superlens 2 has a high transmittance for the light beam emitted by the LED light source 1, it still reflects back a portion of the light beam emitted by the LED light source 1. Therefore, the setting of the reflective layer 8 can reflect a portion of the light reflected back by the superlens 2 back to the superlens 2, thereby improving the energy utilization rate of the light beam emitted by the LED light source 1.
[0073] In one embodiment, for the substrate 5 , when only the surface of the substrate 5 facing the display screen 6 is taken as the object of investigation, the reflective layer 8 only covers the area on the substrate 5 other than the LED light source 1 .
[0074] In one embodiment, for the substrate 5, when only the surface of the substrate 5 facing the display screen 6 is considered, the reflective layer 8 covers the entire area of the substrate 5. In this case, the LED light source 1 is indirectly disposed on the substrate 5 by being directly disposed on the reflective layer 8.
[0075] Fig.11 Schematic diagram of the structure of the display module in one embodiment of the present application is shown. Fig.11In one embodiment, a first optical modulation element 9 is provided between the array LED beam shaping system and the display screen 6, and the first optical modulation element 9 includes at least one of the following: a diffusion element; an anti-reflection element.
[0076] In this embodiment, depending on the application requirements, a diffusion element may be provided between the array-type LED beam shaping system and the display screen 6 to further diffuse and homogenize the uniform light beam shaped by the metalens 2, thereby further improving the light intensity uniformity of the light beam received by the display screen 6. An anti-reflection element may also be provided between the array-type LED beam shaping system and the display screen 6 to improve the transmittance of the uniform light beam shaped by the metalens 2, thereby improving the energy of the light beam received by the display screen 6; when an anti-reflection element is provided between the array-type LED beam shaping system and the display screen 6, the anti-reflection element is preferably attached to the metalens 2 in the form of a film structure.
[0077] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.
Claims
1. An LED beam shaping system, characterized in that: The LED beam shaping system comprises: an LED light source and a metalens for shaping the light beam emitted by the LED light source; The superlens includes a substrate and a micro-nano structure arranged on the surface of the substrate; the micro-nano structures on the same surface have consistent heights; the ratio of the height of any micro-nano structure divided by its cross-sectional diameter is less than or equal to 30; the vertical projection of the LED light source on the plane where the superlens is located and the center of the superlens are less than or equal to 75 μm.
2. The LED beam shaping system according to claim 1, characterized in that: The micro-nano structure is arranged on the rear surface of the substrate; the rear surface of the substrate faces away from the LED light source.
3. The LED beam shaping system according to claim 2, characterized in that: The light beam shaped by the LED light beam shaping system is projected onto a predetermined target plane; the distance from the LED light source array to the target plane is the total distance required for the LED light beam shaping system to work; The distance between the surface where the micro-nano structure is located and the LED light source is greater than or equal to the thickness of the substrate, and less than or equal to one half of the total distance.
4. The LED beam shaping system according to claim 1, characterized in that: The micro-nano structure is arranged on the front surface of the substrate; the front surface of the substrate faces the LED light source.
5. An array LED beam shaping system, characterized in that: The array-type LED beam shaping system comprises at least two LED beam shaping systems as described in any one of claims 1 to 4 above; in the array-type LED beam shaping system, the light emission positions of all the LED light sources are coplanar, and the light incident positions of all the metalenses are coplanar.
6. A display module, characterized in that: The display module comprises: a substrate; an array LED beam shaping system as claimed in claim 5; a display screen; Among them, all the LED light sources in the array-type LED beam shaping system are arranged on the substrate, and all the super lenses in the array-type LED beam shaping system are arranged between the substrate and the display screen; each super lens in the array-type LED beam shaping system is used to homogenize the light beam emitted by the associated LED light source.
7. The display module according to claim 6, characterized in that: All the metalenses in the arrayed LED beam shaping system share the substrate.
8. The display module according to claim 6, characterized in that: The display module also includes: a support layer that is transparent in the working band of the light beam emitted by the LED light source; the support layer is parallel to the display screen; and all the super lenses in the array-type LED beam shaping system are arranged on the support layer.
9. The display module according to claim 6, characterized in that: A reflective layer is provided on the substrate at least in a region surrounding the LED light source.
10. The display module according to claim 6, characterized in that: A first optical modulation element is provided between the array-type LED beam shaping system and the display screen, and the first optical modulation element includes at least one of the following: a diffusion element; and an anti-reflection element.