CN217467452U

CN217467452U - Laser display system based on superlens

Info

Publication number: CN217467452U
Application number: CN202221264185.3U
Authority: CN
Inventors: 谭凤泽; 郝成龙; 朱健
Original assignee: Shenzhen Metalenx Technology Co Ltd
Current assignee: Shenzhen Metalenx Technology Co Ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-09-20
Anticipated expiration: 2032-05-24

Abstract

The present disclosure relates to the field of laser display technology, and in particular, to a superlens based laser display system. The superlens-based laser display system includes: a main laser; and the following components are sequentially distributed along the emergent light path of the main laser: the fluorescent wheel comprises fluorescent powder with multiple colors, and the fluorescent powder is used for performing fluorescence conversion on laser light from the main laser; a projector for spatially modulating the fluorescence from the fluorescence wheel; wherein the projector comprises a superlens arrangement for chromatic aberration correction. The utility model discloses laser display system based on super lens has small and light in weight, can adjust fluorescence colour difference, has simplified the advantage of laser display system complexity.

Description

Laser display system based on superlens

Technical Field

The present disclosure relates to the field of laser display technology, and in particular, to a superlens based laser display system.

Background

The existing laser projection display technology is also called as laser projection technology or laser display technology, and is a display technology which takes red, green and blue (RGB) tricolor laser as a laser light source and can truly reproduce rich and gorgeous colors in an objective world.

The working mode of the laser projection display technology is that a laser device is used for exciting a fluorescent device, and then the excited fluorescent is adjusted through a traditional lens, so that the display of colors and images is realized.

However, the conventional lens solution needs to consider the problems of chromatic aberration correction, work heat, and the like, so that the conventional lens solution often has the problems of large volume, heavy weight, and the like when solving the problems.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect of prior art, the utility model provides a laser display system based on super lens has solved above-mentioned technical problem.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a laser display system based on super lens, include:

a main laser; and the following components are sequentially distributed along the emergent light path of the main laser:

the fluorescent wheel comprises fluorescent powder with multiple colors, and the fluorescent powder is used for performing fluorescence conversion on laser light from the main laser;

a projector for spatially modulating the fluorescence from the fluorescence wheel;

wherein the projector comprises a superlens arrangement for chromatic aberration correction.

In one embodiment, the luminescent wheel is configured as a transmissive luminescent wheel.

In one embodiment, the luminescent wheel is configured as a reflective luminescent wheel.

In one manner that may be implemented, the fluorescent wheel further includes a light filtering region.

In one manner that may be implemented, the filter region is integrally formed with the fluorescent wheel.

In one implementation, the laser display system further includes one or more sub-lasers for increasing the display color gamut of the laser display system.

In one manner that may be implemented, a superlens apparatus for chromatic aberration correction includes:

the substrate can transmit or reflect light with different wave bands, and the light with different wave bands comprises visible light and infrared light;

the superstructure unit comprises a plurality of superstructure units arranged on one surface of a substrate, wherein the superstructure units are arranged in an array; the center position of each superstructure unit, or the center position and the vertex position of each superstructure unit are respectively provided with a nano structure;

the nano structure is respectively axisymmetric along a first axis and a second axis, a plurality of nano structure units obtained by splitting the nano structure along the first axis and the second axis are the same, the first axis and the second axis are vertically arranged, and the first axis and the second axis are respectively vertical to the height direction of the nano structure;

one side of the substrate of the superstructure units forms a super lens surface, the super lens surface is divided into a plurality of concentric circular ring areas along the radius direction, and incident broad spectrum light can form non-chromatic aberration focusing in each circular ring area.

In one manner that may be implemented, the nano-structure is a nano-pillar structure including one of a negative-positive nano-cylinder, a negative nano-cylinder, a hollow nano-pillar structure, a square nano-pillar structure, and a topological nano-pillar structure.

In one manner that may be implemented, the nanostructure is one of a negative square nanorod structure, a negative hollow square nanorod structure, or a hollow square nanorod structure.

In one manner that may be implemented, the optical phase of the nanopillar structure is related to the height of the nanopillar structure, the shape of the cross-section, and the material of the nanopillar structure; the cross section of the nano-pillar structure is parallel to the substrate;

the nano-pillar structure is made of any one or more than two of photoresist, quartz glass, silicon nitride, titanium oxide, aluminum oxide, crystalline and amorphous silicon, gallium nitride, crystalline germanium, selenium sulfide and chalcogenide glass.

In one manner that may be implemented, interference between multiple annular regions of the superlens surface to multiple wavelengths of incident light is enhanced in the focal plane of the superlens apparatus.

In one manner that may be implemented, the rings of the superlens surface are arranged periodically along the equivalent refractive index in the radial direction of the superlens device; the equivalent refractive index is between the refractive index of the nanostructure material and the refractive index of air.

In one implementation, the surface of the superlens and the other surface of the substrate are plated with the anti-reflection films corresponding to the nanostructure material and the substrate material, respectively.

The utility model discloses a laser display system beneficial effect based on super lens is: the emitted light from the main laser excites the fluorescent powder on the fluorescent wheel, and then the fluorescent conversion is carried out to form fluorescence. A projector downstream of the fluorescence wheel performs spatial light modulation on the fluorescence. The projector comprises a super lens device for chromatic aberration correction, the chromatic aberration of the fluorescence is adjusted by using the super lens device with chromatic aberration correction in the process of carrying out spatial light modulation on the fluorescence by using the super lens device, so that the display of colors and images is ensured, and the advantage of no thermalization of the super lens device is also utilized, so that the laser display system does not need to consider the heat dissipation problem. In addition, the super lens device has the advantages of small volume, light weight and the like, and the volume and the weight of the laser display system can be reduced.

For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are provided for the purpose of illustration and description and are not intended to limit the present invention.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic view of a superlens apparatus of a superlens based laser display system of the present invention;

FIG. 2 is a schematic diagram of a regular hexagonal arrangement of the superlens surfaces of the superlens-based laser display system of the present invention;

FIG. 3 is a square array of the superlens surface of the superlens-based laser display system of the present invention;

FIG. 4 is a schematic diagram of a nano-pillar structure of a superlens based laser display system of the present invention;

FIG. 5 is a schematic diagram of embodiment 1 of the superlens based laser display system of the present invention;

FIG. 6 is a schematic diagram of embodiment 2 of the superlens based laser display system of the present invention;

FIG. 7 is a schematic diagram of embodiment 3 of the superlens based laser display system of the present invention;

fig. 8 is a schematic diagram of embodiment 4 of the superlens-based laser display system of the present invention.

Reference numerals:

1. a main laser; 2. a fluorescent wheel; 3. a projector; 4. a light pipe; 5. a fluorescence region; 6. a light filtering area; 7. a superlens device; 8. a substrate; 9. a superstructure unit; 91. a nanostructure; 10. a focusing lens; 11. a first reflector; 12. a second reflector; 13. a slave laser; 14. a half-reflecting and half-transmitting mirror; 15. a circular ring.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.

The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. The features of the following examples and embodiments may be combined with each other without conflict.

Referring to fig. 1 to 8, the present invention discloses a laser display system based on a superlens, which includes a main laser 1, a fluorescent wheel 2 and a projector 3.

The main laser 1 is used for emitting laser, and a laser device which is matched with the fluorescent wheel 2 and can excite fluorescence can be selected.

And a fluorescent wheel 2 including phosphors of a plurality of colors for performing fluorescence conversion of the laser light from the main laser 1. Specifically, different regions may be set on the surface of the luminescent wheel 2 depending on the different colors of the phosphors, so that each region has one color of the phosphor, forming a monochromatic luminescent region 5. For example, a plurality of fluorescent regions 5 capable of converting a desired color may be provided on the fluorescent wheel 2, and adjacent two regions may be provided at intervals or at intervals. When the laser light is emitted to the fluorescent region 5, the region is activated to emit fluorescent light.

The projector 3 comprises a superlens device 7 for chromatic aberration correction, preferably a large-aperture chromatic aberration correction superlens device 7, and the fluorescence emitted to the projector can be subjected to spatial light modulation by the chromatic aberration correction superlens device 7. Specifically, the chromatic aberration corrected superlens device 7 may chromatically modulate the fluorescence directed thereto so that the fluorescence transmitted therethrough is free of chromatic aberration.

The chromatic aberration corrected superlens device 7 may also modulate the superlens device 7 to focus the fluorescence emitted to it so that the fluorescence emitted through it can be focused on the same focal plane, in case of the need of focusing the fluorescence emitted through the superlens according to the need of the laser display system. In the case where the focal plane is at the incident end of the light pipe 4, the fluorescence is transmitted to a specified position by the light pipe 4.

A superlens is a particular application of optical supersurfaces. Optical super-surfaces have demonstrated super-surface based axicons, blazed gratings, polarizers, holographic dry plates and planar lenses. The continuous 2 pi phase change optical super surface realizes a single-layer aplanatic super lens. And a double-layer super-surface super-lens can correct all monochromatic aberrations. However, the chromatic aberration correction superlens is limited by the limit of processing technology, and the conventional chromatic aberration correction superlens hardly considers both large aperture and large numerical aperture, so that the application of the superlens in an imaging optical system is greatly limited. The embodiment of the application provides a super lens device 7 for chromatic aberration correction. As shown in fig. 2 and 3, further, the superlens device 7 for chromatic aberration correction may include a substrate 8 and a plurality of superstructure units 9 disposed on one surface of the substrate 8, wherein the plurality of superstructure units 9 are arranged in an array, and the superstructure units 9 may be regular hexagons and/or squares.

The substrate 8 may be made of quartz glass or crystalline silicon; it should be understood that the substrate 8 may be made of other materials.

The substrate 8 is transparent or reflective to different wavelength bands of light, which may include visible light and infrared light.

Then, the center position of the superstructure unit 9, or the center position and the vertex position of the superstructure unit 9 are provided with the nanostructures 91, respectively.

The nanostructure 91 is a structure axisymmetric along the first axis and the second axis, respectively, so that the nanostructure 91 is divided along the first axis and the second axis to obtain a plurality of identical nanostructure 91 units. Specifically, the first axis and the second axis are vertically disposed, and the first axis and the second axis are respectively perpendicular to the height direction of the nanostructure 91, and thus, the superlens device 7 has a polarization-insensitive characteristic.

As shown in FIG. 1, the nanostructures 91 at different positions on the substrate 8 differ in optical phase at different wavelengths to define the optical phase distribution of the superlens device 7 at different wavelengths. In the case where the super lens surface is formed on the substrate 8 side of the plurality of superstructure units 9, the super lens surface is divided into a plurality of concentric rings 15 in the radial direction thereof, and incident broad spectrum light can be focused without chromatic aberration at each ring 15. The principle is as follows: the optical phases of the super lens under different wavelengths are different, the surface of the super lens is divided into a plurality of concentric circular ring areas along the radius direction, incident broad spectrum light forms non-chromatic aberration focusing on each circular ring 15, interference enhancement is performed on a plurality of wavelengths of the incident light between the circular rings 15 on the focal plane of the super lens, for example, the plurality of wavelengths comprise a center wavelength and two edge wavelengths, and therefore the problem that the chromatic aberration correction super lens device 7 is compatible with a large aperture and a large numerical aperture is solved.

The rings 15 of the superlens surface are arranged periodically along the equivalent refractive index of the radius direction of the superlens surface; the equivalent refractive index is between the refractive index of the nanostructure 91 material and the refractive index of air.

Specifically, the calculation formula of the equivalent refractive index of the superlens surface is as follows:

in the formula, the content of the active carbon is shown in the specification,

the phase with the radius r and the wavelength lambda of the surface of the super lens; ω is the angular frequency of the light; c is the speed of light; h is the height of the nano-pillar structure; r is the radius of the superlens surface, i.e. the distance of each nanostructure 91 to the center of the substrate 8.

The periodic arrangement of the rings 15 can be determined by this formula.

It will be appreciated that when the superlens device 7 is limited to the mounting space of the projector 3 such that the superlens device 7 is non-circular in shape, it may be divided into a plurality of circular rings 15 centered on the central region in a direction extending from the central region of the superlens device 7 toward the edge, and each circular ring 15 may be set to have a different optical phase depending on the wavelength of the laser light directed thereto. In the actual processing process, one ring 15 may be used as the same optical phase distribution interval, and further, one ring 15 interval may be divided into a plurality of regions, each region adopting the same optical phase, so that the incident broad spectrum light can form the chromatic aberration-free focus in the ring region. The phase required by the nanostructures 91 at different wavelengths, the closest phase of the nanostructure 91 may be looked up in a database of nanostructures 91.

It should be noted that the superlens device 7 may be a superlens with a large aperture, and a specific selectable range is 10-100mm, for example, the superlens device 7 may be a superlens device 7 with a large aperture such as 10mm, 20mm, 30mm, 40mm or 50mm, and any value between 10-100 may be selected in addition to the above values. It is also understood that, as the technology of the high-speed laser direct writing processing method, the photolithography processing method, and the nanoimprint processing method advances, in the case where the superlens device 7 having a larger aperture can be processed, the superlens device 7 may be a superlens having an aperture larger than 100 mm. In the case of selecting a superlens with a large aperture, the aperture of the superlens can be increased according to the requirements of the design scheme.

Interference enhancement is performed on the focal plane of the superlens on the central wavelength and the two edge wavelengths of incident light among the circular rings 15 of the large-caliber superlens device 7, so that the superlens device 7 for realizing chromatic aberration correction can give consideration to both the large caliber and the large numerical aperture, and the chromatic aberration correction superlens device 7 with the large caliber and the large numerical aperture can correct chromatic aberration and obtain clearer image quality.

Next, the thickness of the superlens device 7 is the sum of the thickness of the overall structure formed by the plurality of nanostructures 91 and the thickness of the substrate 8. The substrate 8 may be a supporting structure for supporting the plurality of nanostructures 91, and the material used for the substrate 8 may be the same as or different from the material used for the nanostructures 91.

Third, the nano-structure 91 is a nano-pillar structure including one of a negative-positive nano-pillar, a negative nano-pillar, a hollow nano-pillar structure, a square nano-pillar structure, and a topological nano-pillar structure. Further, the nanostructure 91 is preferably one of a negative square nanorod structure, a negative hollow square nanorod structure, or a hollow square nanorod structure.

As shown in fig. 4, in the nano-structure 91, a nano-pillar structure is taken as an example to illustrate, and the optical phase of the nano-pillar structure is related to the height of the nano-pillar structure, the shape of the cross section, and the material of the nano-pillar structure.

Illustratively, when the overall structure formed by the plurality of nanostructures 91 is required to transmit visible light, the height of the nano-pillar structure may be between 300nm and 1500nm, inclusive, and illustratively, the height of the nano-pillar structure is 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, and so on, to 1500nm, and so on, or any other value within the range.

When the overall structure formed by the plurality of nanostructures 91 needs to transmit infrared light in a wavelength band of 8 to 12 μm, the height H of the nano-pillar structure is greater than or equal to 5 μm and less than or equal to 50 μm.

The cross-section of the nano-pillar structure is parallel to the substrate 8. Illustratively, the cross-section of the nano-pillar structure is parallel to the substrate 8, with the first and second axes passing through the center of the nano-structure 91 and parallel to the horizontal plane.

The nano-pillar structure is made of any one or more than two of photoresist, quartz glass, silicon nitride, titanium oxide, aluminum oxide, crystalline and amorphous silicon, gallium nitride, crystalline germanium, selenium sulfide and chalcogenide glass. It should be understood that other materials for the nano-pillar structure are possible.

In the present embodiment, the projector 3 having the super lens device 7 for chromatic aberration correction is used to perform spatial light modulation on the fluorescence from the fluorescence wheel 2 to correct the chromatic aberration of the fluorescence, and a large aperture in the order of centimeters is used, so that a clear image quality can be obtained. Secondly, since the superlens arrangement 7 is insensitive to the polarization of the incident light, it has the advantage of small thickness and light weight compared to the lenses used in conventional lens solutions. Finally, because of the high power of the primary laser 1, the conventional lens solution needs to consider heat dissipation issues that are solved or mitigated after using the superlens device 7 with athermalization.

In one embodiment, the surfaces of the superlens and the other surface of the substrate 8 are plated with antireflection films corresponding to the nanostructure material and the substrate material, respectively.

Wherein, the surface of the substrate 8 not provided with the superlens can be provided with an antireflection film matched with the wave band according to the wave band of the incident light. The refractive index of the antireflection film is matched with that of the nano-structure material so as to increase the light transmission amount. For example, when the incident light is infrared light, an antireflection film for an infrared light band may be provided on the substrate 8; if the incident light is visible light, an antireflection film for the visible light band may be disposed on the substrate 8 in the same manner.

Further, the antireflection film may be formed on the substrate 8 by a process such as pulling or coating.

It can be understood that, according to actual needs, an antireflection film may also be disposed on a surface of the superlens away from the substrate 8, and the antireflection film disposed on the superlens surface matches with the antireflection film disposed on the substrate 8 in refractive index.

In this embodiment, the antireflection film can reduce or eliminate the reflected light from the surface of the superlens and the substrate 8, thereby increasing the amount of transmitted light and effectively reducing or eliminating the stray light of the laser display system.

Example 1

As shown in fig. 5, a superlens-based laser display system may include: a primary laser 1, a focusing lens 10, a luminescent wheel 2, a projector 3 and a light guide 4, wherein the luminescent wheel 2 is designed here as a transmissive luminescent wheel.

In which the main laser 1 emits laser light to the focusing lens 10. In general, the laser light emitted from the main laser 1 is monochromatic light, such as blue light.

A focusing lens 10, optionally a focusing superlens, is used to focus the laser light directed thereto on the fluorescent wheel 2.

And the fluorescent wheel 2 is provided with fluorescent powder with different colors, and the fluorescent powder performs respective fluorescent conversion under the condition of being irradiated by laser to form corresponding fluorescent light.

The projector 3, which includes a reflective chromatic aberration-correctable superlens device 7, spatially modulates the fluorescent light from the fluorescent wheel 2 so as to focus the fluorescence without chromatic aberration on the incident end of the light guide 4.

The light pipe 4 transmits the received fluorescence to the emitting end thereof.

The working principle is as follows:

the main laser 1 emits laser light, the laser light is focused on the fluorescent powder on the fluorescent wheel 2 after passing through the focusing lens 10, fluorescence is formed through fluorescence conversion, and the fluorescence is refracted to the light guide pipe 4 after being corrected by chromatic aberration of the projector 3. Through the rotation of the fluorescent wheel 2 during the working period, the incident laser is subjected to different fluorescent conversions by the fluorescent powder with different colors on the fluorescent wheel 2 to obtain fluorescent lights with different colors, and the fluorescent lights with different colors are respectively and sequentially emitted into the light guide pipe 4 after being processed by the projector 3 based on the super lens device 7, so that the display is realized.

In this embodiment, the super lens device 7 with reflective chromatic aberration correction disposed on the projector 3 performs chromatic aberration correction and reflection on the fluorescence, and emits the modulated fluorescence to the light pipe 4, so that the light pipe 4 can receive fluorescence without chromatic aberration, and the projector 3 includes the super lens device 7 with reflective chromatic aberration correction, so that the laser display system has the advantages of small structure and light weight.

Example 2

As shown in fig. 6, a superlens-based laser display system may include: the primary laser 1, the first mirror 11, the projector 3, the fluorescent wheel 2, the second mirror 12, the focusing lens 10 and the light pipe 4, wherein the fluorescent wheel 2 here forms a reflective fluorescent wheel.

Wherein the main laser 1 emits laser light to the projector 3. In general, the laser light emitted from the main laser 1 is monochromatic light, such as blue light.

The projector 3 comprises a super lens device 7 capable of chromatic aberration correction, and the super lens device 7 can perform chromatic aberration correction on the fluorescence emitted to the super lens device and also can collimate the fluorescence. The superlens arrangement 7 focuses the laser light from the primary laser 1 onto the fluorescent wheel 2.

The fluorescent wheel 2 comprises a fluorescent area 5 consisting of fluorescent powder and a filter area 6, wherein the fluorescent area 5 is activated by laser from the projector 3 to form fluorescent light, the fluorescent light is emitted to the projector 3 and is subjected to chromatic aberration correction and collimation by a superlens device 7, the filter area 6 is used for filtering non-working light, specifically, the filter area 6 is used for performing color correction on the excited fluorescent light, for example, part of the fluorescent area 5 is yellow powder, and the filter area 6 filters red fluorescent light excited by the yellow powder, so that the purpose of color correction is achieved, and the accuracy and stability of color are improved. Furthermore, the fluorescence area 5 and/or the filter area 6 are formed integrally with the fluorescence wheel 2, wherein the filter area 6 can preferably have a band stop filter. In one embodiment of the fluorescent wheel 2, the fluorescent regions 5 and the filter regions 6 are arranged concentrically in a ring.

The first mirror 11 is used for receiving the fluorescent light modulated by the projector 3 and reflecting the fluorescent light to the second mirror 12. Further, if the first reflecting mirror 11 is disposed on the light path from the main laser 1 to the projector 3, the first reflecting mirror 11 is a beam splitter.

And a second reflecting mirror 12 for reflecting the fluorescent light directed thereto to the filter region 6 of the fluorescent wheel 2. The propagation direction of the fluorescence can be adjusted by the first reflector 11 and the second reflector 12, so that the fluorescence passes through the filter region 6 of the fluorescence wheel 2, the non-working light in the fluorescence is filtered out by the filter region 6, the fluorescence with the required radiation waveband is selected to pass through, and the image quality and the brightness are further improved. It is understood that the first mirror 11 and the second mirror 12 may be provided as a superlens with a reflection function.

Further, it should be noted that the arrangement and arrangement of the first and second reflecting

mirrors

11, 12 may be arbitrarily changed according to the actual optical path in the laser display system.

The light guide 4 receives the fluorescence transmitted through the filter region 6 at its receiving end and transmits the fluorescence to its emitting end.

In the present embodiment, the superlens device 7 with chromatic aberration correction modulates the fluorescence emitted thereto by chromatic aberration correction, and the modulated fluorescence is reflected multiple times and emitted to the filter region 6 of the fluorescence wheel 2, thereby improving the color and the image quality and brightness of the image.

Example 3

As shown in fig. 7, the superlens-based laser display system may further include, on the basis of embodiment 2: a sub-laser 13 and a half-reflecting and half-transmitting mirror 14.

If the laser light emitted from the main laser 1 is blue light, the sub-laser 13 can emit red light to supplement the deficiency of red light.

Specifically, the half mirror 14 is provided on the optical path of the laser light emitted from the main laser 1, and the laser light emitted from the main laser 1 can pass through the half mirror 14. The laser light emitted from the secondary laser 13 is emitted to the half-reflecting and half-transmitting mirror 14, and is reflected by the half-reflecting and half-transmitting mirror 14, so that the laser light emitted from the secondary laser 13 and the laser light emitted from the main laser 1 are positioned on the same optical path and are emitted to the fluorescent wheel 2 together. It is understood that the half mirror 14 can be replaced by a superlens with half mirror function. Here, when the main laser 1 is a blue laser, the sub-laser 13 is preferably a laser that emits red light.

In the present embodiment, red insufficiency is avoided by arranging the secondary laser 13 near the primary laser 1 of the superlens-based laser display system, so that the superlens-based laser display system has better color accuracy and color gamut coverage.

Example 4

As shown in fig. 8, the superlens-based laser display system may further include, on the basis of embodiment 2: three slave lasers 13 and two half mirrors 14.

The second reflecting mirror 12 is replaced with a half-mirror 14 for reflecting the fluorescence generated by the excitation of the fluorescence region 5 by the main laser 1 and transmitting the laser light emitted from the sub-laser 13. Specifically, the three sub lasers 13 may emit red laser light, green laser light, and blue laser light, respectively. The laser beams emitted by the three sub-lasers 13 are emitted to the half-reflecting and half-transmitting mirror 14, specifically, the laser beams emitted by one of the sub-lasers 13 can be directly emitted to the half-reflecting and half-transmitting mirror 14, two spaced half-reflecting and half-transmitting mirrors 14 are arranged on the laser beam path of the sub-laser 13, the other two sub-lasers 13 are respectively emitted to the corresponding half-reflecting and half-transmitting mirrors 14, and the two half-reflecting and half-transmitting mirrors 14 reflect the laser beams emitted by the other two sub-lasers 13, so that the laser beams emitted by the three sub-lasers 13 are all emitted to the half-reflecting and half-transmitting mirror 14 replacing the second mirror 12. Here, in the case where the main laser 1 is a blue laser, the three sub-lasers 13 are preferably a laser that emits red light, a laser that emits green light, and a laser that emits blue light, respectively.

In this embodiment, after the laser display system based on the superlens sets three slave lasers 13, three-color RGB (RGB includes red, green, and blue) lasers and fluorescence are fused, so as to improve the color gamut coverage and the fluorescence utilization rate.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A superlens based laser display system, comprising:

a fluorescent wheel including phosphors of a plurality of colors for performing fluorescence conversion of laser light from the main laser;

2. The superlens-based laser display system of claim 1, wherein the fluorescent wheel is configured as a transmissive fluorescent wheel.

3. The superlens-based laser display system of claim 1, wherein the phosphor wheel is configured as a reflective phosphor wheel.

4. The superlens-based laser display system of claim 1, wherein the fluorescent wheel further comprises a filter region.

5. The superlens-based laser display system of claim 4, wherein the light filtering region is integrally formed with the phosphor wheel.

6. The superlens-based laser display system of claim 1, further comprising one or more secondary lasers to enhance a display color gamut of the laser display system.

7. A superlens-based laser display system according to any of claims 1 to 6, wherein the superlens means for chromatic aberration correction comprises:

the substrate can transmit or reflect light with different wave bands, wherein the light with different wave bands comprises visible light and infrared light;

the superstructure unit comprises a plurality of superstructure units arranged on one surface of the substrate, wherein the superstructure units are arranged in an array; the center position of each superstructure unit, or the center position and the vertex position of each superstructure unit are respectively provided with a nano structure;

one side of the substrate of the plurality of superstructure units forms a super lens surface, the super lens surface is divided into a plurality of concentric circular ring areas along the radius direction, and incident broad spectrum light can form non-chromatic aberration focusing in each circular ring area.

8. The superlens-based laser display system of claim 7, wherein the nano-structures are nano-pillar structures comprising one of negative-positive nano-cylinders, negative nano-cylinders, hollow nano-pillar structures, square nano-pillar structures, and topological nano-pillar structures.

9. The superlens-based laser display system of claim 8, wherein the nanostructure is one of a negative square nanopillar structure, a negative hollow square nanopillar structure, or a hollow square nanopillar structure.

10. The superlens-based laser display system of claim 9, wherein the optical phase of the nano-pillar structures is related to the height of the nano-pillar structures, the shape of the cross-section, and the material of the nano-pillar structures; the cross section of the nano-pillar structure is parallel to the substrate;

11. The superlens-based laser display system of claim 7, wherein the interference between the annular regions of the superlens surface for the wavelengths of incident light is enhanced in a focal plane of the superlens device.

12. The superlens-based laser display system of claim 11, wherein the annular rings of superlens surfaces are arranged periodically along the equivalent refractive index in the radial direction of the superlens means; the equivalent refractive index is between the refractive index of the nanostructure material and the refractive index of air.

13. The superlens-based laser display system of claim 7, wherein the surface of the superlens and the other surface of the substrate are coated with antireflection films corresponding to the nanostructure material and the substrate material, respectively.