38results about How to "Improve optical efficiency" patented technology

The utility model discloses a solar heat collector, which relates to the technical field of solar thermal power generation and comprises a condenser component and a heat collecting tube. The condenser assembly comprises a first condenser, a second condenser and a third condenser, the first condenser comprises a supporting piece and a first reflection assembly rotationally arranged on the supporting piece, the first reflection assembly rotates around the rotating center of the first condenser, and the second condenser and the third condenser are connected with the first reflection assembly. The condensation center of the third condenser coincides with the rotation center of the first reflection assembly. The heat collecting pipe is arranged at the rotating center position of the first reflection assembly. According to the solar heat collector provided by the invention, high-power light condensation is realized by adopting a multi-reflection light condensation mode, and the optical efficiency and the heat collection efficiency of the solar heat collector are improved. Meanwhile, the heat collecting pipe is placed at the rotating center position of the first condenser, the effect that the heat collecting pipe does not rotate can be achieved, and therefore the problem of liquid leakage of a rotating connector of the heat collecting pipe is solved.

The invention discloses a diffractive optical waveguide and a preparation method thereof, and a head-mounted display device, and relates to the technical field of augmented reality, and the preparation method of the diffractive optical waveguide comprises the steps: obtaining a target eye box range adaptive to a target crowd; according to the human eye parameters of each user group in the target group, splitting the target eye box range to obtain sub-eye box ranges adapted to each user group; diffractive optical waveguides adapted to the user groups are prepared based on the sub-eye box ranges, and the area of a coupled-out grating in each diffractive optical waveguide is smaller than the area of a coupled-out grating of an optical waveguide designed for covering the target eye box range. The optical efficiency and uniformity of the diffractive optical waveguide can be ensured, and the diffractive optical waveguide is prevented from generating obvious rainbow lines, so that the use experience of a user is improved.

The embodiment of the invention provides a diffractive optical waveguide test system and test method. The diffractive optical waveguide comprises a light coupling-in area, and the test system comprises a movable carrying platform which is used for carrying the diffractive optical waveguide; the first sliding rail is arranged on the outer side of the movable carrying table in a surrounding mode, a light source assembly is arranged on the first sliding rail, and the light source assembly is used for projecting first light rays to the light ray coupling-in area; the second sliding rail is arranged on the outer side of the first sliding rail in a surrounding mode, a light ray analysis component is arranged on the second sliding rail, the light ray analysis component is movably arranged on the first sliding rail, and the light ray analysis component is used for receiving second light rays and determining energy of the second light rays; and determining the light energy loss proportion of the diffraction optical waveguide according to the energy of the second light, wherein the second light is the light coupled out by the light coupling-in area.

The invention provides an LED light source module and a lamp, the LED light source module comprises a light source plate, a waterproof isolation layer and an integrated lens, the light source plate is provided with an LED chip serving as a light source, the integrated lens comprises a plate body and a lens body arranged on the plate body, the lens body comprises a light incoming surface and a light outgoing surface which are oppositely arranged, and the waterproof isolation layer is arranged on the light incoming surface. The light incident face is an arc face protruding towards the LED chips from the plate body, and the space between the light source plate and the integrated lens is filled with a waterproof isolation layer. According to the LED light source module provided by the invention, the glue above each LED chip is in contact with the cambered incident surface of the lens body, and the convex incident surface extrudes and exhausts air at the top of the LED chip during contact, so that the lighting effect is improved. The waterproof isolation layer formed by glue pouring is covered by the integrated lens, the glue surface is not directly exposed, and the defect that silica gel adsorbs dust is avoided. The light source, the glue and the lens are integrally bonded, and the effects of improving the optical efficiency and enhancing the waterproof performance are achieved.

The invention provides a small-opening low-beam module system which comprises a low-beam lens body, a low-beam light source module, a low-beam main light type total reflection module, a low-beam auxiliary light type total reflection module and a low-beam light-in lens module are arranged at the light-in end of the low-beam lens body, and a low-beam light-out lens module is arranged at the light-out end of the low-beam lens body; a cut-off line area is formed between the low-beam main light type total reflection module and the low-beam auxiliary light type total reflection module; the low-beam main light type total reflection module and the low-beam auxiliary light type total reflection module are located on the upper side and the lower side of the cut-off line area respectively. A traditional low beam optical system is optimized and simplified into one part which is only provided with the light inlet face, the total reflection face and the light outlet face, and the design of a module with an extremely small opening can be achieved.

The utility model provides an optical system which comprises light sources, a thick-wall piece and a light guide, and the light sources comprise a first light source and a second light source. The first light source emits first light, and the first light enters the thick-wall piece through the first incident face, is totally reflected on the first total reflection face and is emitted out of the thick-wall piece through the first emergent face. The light guide comprises a first part with a rectangular section, and the first part comprises a second light-in surface and a second light-out surface; the first light is emitted out of the thick-wall part through the first light-emitting surface, enters the light guide through the second light-entering surface and is emitted out of the light guide through the second light-emitting surface; the second light source emits second light, the second light enters the light guide through the third light-in surface, and the second light is totally reflected on the second total reflection surface and then is emitted out of the light guide through the third light-out surface. After the technical scheme is adopted, the two light-emitting areas can be lightened on the same PCB at the same time, and space is saved for the interior of the automobile lamp.

The invention discloses a vehicle LED light source and a vehicle illumination module, and relates to the technical field of vehicle lamps, in the vehicle LED light source, a fluorescent layer covers a plurality of LED chips, so that light emitted by the LED chips can enter the fluorescent layer, the light is subjected to wavelength conversion by the fluorescent layer and then emits white light, and the surface, deviating from the plurality of LED chips, of the fluorescent layer is the light-emitting surface of the vehicle LED light source; in the vehicle LED light source, the reflecting layer at least surrounds the fluorescent layer, the reflecting layer not only reflects the light emitted by the LED chip to the outside of the fluorescent layer to the fluorescent layer so as to improve the optical efficiency, but also limits and divides the light-emitting surface, so that the light-emitting surface of the vehicle LED light source can be in the shape of a target light shape, and the light-emitting efficiency of the vehicle LED light source is improved. Therefore, the target light shape can be formed only by zooming the automotive LED light source according to the light shape emitted by the light-emitting surface of the automotive LED light source by the optical system subsequently, so that the automotive illumination module is high in optical efficiency, simple in structure and low in cost.

The utility model discloses a PPG packaging module and electronic equipment. The PPG packaging module comprises a packaging substrate, a packaging rear shell, a plurality of retaining wall structures, at least one light emitting module, at least one light receiving module and a light-transmitting protection layer, the packaging rear shell is fixedly installed on the packaging substrate, and a wrapping cavity is formed between the packaging rear shell and the packaging substrate. Two ends of the plurality of retaining wall structures are respectively connected with the upper surface of the packaging substrate and the packaging rear shell, and the packaging cavity is divided into a plurality of cavities; the light emitting module and the light receiving module are arranged on the packaging substrate and are arranged in the plurality of cavities in a staggered manner; the light-transmitting protective layer is arranged in the cavity. According to the PPG module, through the arrangement, light emitted by the light emitting module can be received by the light receiving module only by penetrating through the light-transmitting protective layer and then being reflected by the skin, so that the refraction times required during light conduction are effectively reduced, the optical efficiency of the PPG module is improved, and the purpose of reducing the power consumption of a system is achieved.

The present disclosure relates to a quantum dot-polymer composite, an immunodetection conjugate including the quantum dot-polymer composite, and a diagnostic kit using the same, the composite including a quantum-bead of a 3D self-assembly structure including one or more quantum dots that has a core-shell structure, a surface-modifying ligand arranged on the surface of the quantum dots, and one or more polymer ligands, wherein the one or more quantum dots are dispersed within the quantum-bead, the core including indium phosphide (InP), and the shell that has a thickness of from 3 nm to 9 nm.

The embodiment of the invention provides a light guide device and head-mounted display equipment. Wherein the light guide device comprises a substrate, a coupling-in area, a coupling-out area and a pupil expanding area, the coupling-in area, the coupling-out area and the pupil expanding area are arranged on the substrate, the coupling-in area comprises two coupling-in gratings, the coupling-out area comprises two coupling-out gratings, and the pupil expanding area comprises two pupil expanding gratings; wherein the pupil expanding area is located between light paths of the coupling-in area and the coupling-out area, light coupled in from any coupling-in grating can be coupled out from the two coupling-out gratings after being modulated through the two pupil expanding gratings, and the two coupling-out gratings correspond to the left eye and the right eye respectively. The embodiment of the invention provides a scheme of a binocular-to-single light guide device, so that the optical efficiency and the image uniformity can be improved, and the imaging effect of waveguides and the like is improved.

The application discloses a front light guide plate for a reflective display device and a manufacturing method thereof, comprising a light guide plate body with an incident light surface and an exit light surface oppositely arranged; a plurality of light guide dots formed on the exit light surface for guiding light from the incident light surface to a display surface of the reflective display device; wherein the light guide dots are conical or pyramidal; when the light guide dots are conical, the ratio of the bottom width A to the depth B is less than 0.1; when the light guide dots are pyramidal, the included angle between the inclined surface and the bottom surface is between 55 degrees and 70 degrees. The application optimizes the shape parameters of the dots, so that the light is more efficiently guided to the display surface, thereby significantly improving the overall display brightness under the same light source conditions.

The invention relates to an image sensor and a preparation method thereof. The image sensor comprises a substrate, photosensitive elements arranged in an array, a filter layer, a micro-lens layer and at least two stacked anti-reflection layers, the photosensitive elements are located above the substrate, the filter layer is located above the photosensitive elements, the filter layer comprises a first filter unit and a second filter unit, the first filter unit is used for transmitting light in a first wave band range, and the second filter unit is used for transmitting light in a second wave band range. The first light filtering unit is used for transmitting light in a first wave band range, the second light filtering unit is used for transmitting light in a second wave band range, the micro-lens layer is located above the light filtering layer and comprises a first micro-lens and a second micro-lens, the first micro-lens is located above the first light filtering unit, and the second micro-lens is located above the second light filtering unit; the at least two stacked anti-reflection layers are located above the first microlenses. According to the invention, the anti-reflection layer can be prepared above one or a part of filtering units in the filtering layer in a targeted manner, and the optical efficiency of one or a part of filtering units is independently and further improved.

The utility model belongs to solar heating technology field, specifically disclose a box body light -concentrating type solar medium temperature heat collector, the utility model discloses a sealed box body of one side glass cover, the bottom and the side surface of box body are equipped with heat preservation layer, be equipped with upper flow collecting pipe and lower flow collecting pipe in the box body, be equipped with at least two fin heat absorption unit between heat preservation layer and glass cover, the both ends of fin heat absorption unit are connected with the upper flow collecting pipe and lower flow collecting pipe of the intercommunication box body respectively, fin heat absorption unit includes fin adsorption pipe and reflector, and fin adsorption pipe sets up at the light -concentration of reflector surface. The utility model discloses the synergistic effect of metal light -concentrating structure and straight -through type flow channel design, can realize the stable output of medium temperature, improve the pressure intensity of system output, improved the reliability of medium temperature pressure bearing. The utility model can be widely applied to the light -heat conversion field of solar energy.

The utility model provides a low-beam three-area car lamp module system and a car lamp. The low-beam three-area car lamp module system comprises a lens, a reflector assembly, a radiator and a light source. The reflector assembly comprises a reflector and a reflector frame, and the reflector is connected with the lens through the reflector frame; a three-area reflecting surface is arranged on the reflecting mirror; a light blocking strip is arranged on the radiator, and a three-area structure is arranged on the light blocking strip. The three-area reflecting surface at the root part of the reflecting mirror is matched with the light barrier and the radiator, so that light rays originally passing through the light barrier are changed into light rays passing through the lower part of the light barrier, the light distribution requirement of the three areas is realized, the optical efficiency is greatly improved, the control on parts is reduced, and a more stable optical effect is realized.

The invention provides a condensation LED module which comprises a lamp bead and a dimming assembly arranged on an emergent light path of the lamp bead, the dimming assembly comprises a progressive lens, the progressive lens is provided with an incident plane and an emergent plane, the light extension direction of the lamp bead is from the incident plane to the emergent plane, the progressive lens comprises a concentration point, a first part and a second part, and the first part is arranged on the first part. The distance between the first part and the concentration point is smaller than that between the second part and the concentration point, and the refractive index of the first part is larger than that of the second part. The change of the refractive index enables the light to be gradually guided along the extension direction of the lens, thereby avoiding the sudden change of the light at different parts of the lens, and reducing the distortion of off-axis light. The first part with the high refractive index is beneficial to enhancing the focusing effect of the central area, and the second part with the low refractive index enables the deflection of edge light rays to be more accurate, so that the scattering phenomenon of light beams is reduced, and the definition and the optical efficiency of light spots are improved.

The invention relates to a near-to-eye display device, an optical system and electronic equipment, the near-to-eye display device comprises a first optical lens, an optical waveguide sheet and a second optical lens, the first optical lens is provided with a first outer surface and a first inner surface, and the optical waveguide sheet is provided with a first plane and a second plane; the second optical lens is provided with a second outer surface and a second inner surface, at least part of the first outer surface is a curved surface, at least part of the second outer surface is a curved surface, and at least one of the first inner surface and the second inner surface is a plane; a coupling-in grating is arranged on one surface of at least one of the first optical lens and the second optical lens, a coupling-in grating is arranged on at least one of the first plane and the second plane, and a coupling-out grating is arranged on at least one of the first inner surface and the second inner surface. The inner surface where the out-coupling grating is located is a plane, and at least one of the first plane and the second plane is provided with the out-coupling grating.

The utility model discloses a car lamp projection lighting system. A spatial light modulator, a projection lens and a photomask are sequentially arranged from an object side to an image side. The spatial light modulator is a DMD, an LCD or an LCoS, and is an object space in the vehicle lamp projection illumination system. The projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a diaphragm, wherein the first lens, the second lens and the third lens form a three-separated lens group or a single-double separated lens group. The diaphragm is located between the first lens and the photomask and specifically comprises an aperture diaphragm and a field diaphragm. The photomask is located between the fifth lens and the image space. The car lamp projection lighting system has the advantages of being high in optical efficiency and good in imaging quality, and meets the requirement for high resolution while meeting high-brightness lighting. In addition, the system is simple and compact in structure, and the lens is made of a full-glass material, so that the system has good environmental reliability.

The present invention discloses a diffraction optical waveguide and a preparation method thereof, and a display device, and relates to the technical field of diffraction optical waveguides, wherein the diffraction optical waveguide comprises a substrate and an asymmetric grating arranged on the substrate, the asymmetric grating comprises at least one asymmetric grating periodic unit, each asymmetric grating periodic unit comprises a first grating periodic structure and a second grating periodic structure whose cross-sectional shapes are symmetrical about the grating axis plane, the second grating periodic structure comprises a first main body portion arranged on a first side surface of the first grating periodic structure, a second main body portion arranged on a top surface of the first grating periodic structure, and a third main body portion transitionally connected between the first main body portion and the second main body portion; a side surface of the second main body portion away from the first grating periodic structure is a first inclined surface, the first inclined surface extends in a direction away from the substrate, and is inclinedly arranged in a direction away from the first grating periodic structure; the technical solution of the present invention can provide a diffraction optical waveguide with high optical efficiency.

The utility model relates to optical and photovoltaic technical field, concretely is a kind of high-power condensing photovoltaic device based on toughened glass fresnel lens, comprising: toughened glass fresnel lens, adopt sodium calcium super white glass double-sided toughened and become, one side surface is set as smooth surface, the other side surface is formed through heating mould pressing and is formed with fresnel, realize high-power condensing through fresnel, photovoltaic chip is used to accept the sunlight focused by toughened glass fresnel lens, and power is exported through wire.The utility model solves the pain point that traditional lens weatherability is poor, glass lens weight is big, can replace silicon wafer, acrylic lens, is convenient for maintenance and use, greatly improves the optical efficiency and energy density of condensing photovoltaic system, can also be used for lighting, aviation, aerospace field.

The invention discloses a metasurface integrated Micro-LED structure with light beam shaping and light extraction enhancing functions, the structure comprises a Micro-LED chip and a single-layer metasurface structure directly integrated on the light emitting surface of the Micro-LED chip, and the metasurface is composed of a plurality of sub-wavelength nano units arranged in a two-dimensional array. Wherein the sizes and the space periods of the nano units are cooperatively designed according to the light-emitting center wavelength of the Micro-LED, the distance from a light-emitting layer in the chip to a light-emitting surface and a preset deflection angle of a light beam, so that phase delay values introduced by the units jointly form a composite two-dimensional phase distribution. According to the phase distribution, firstly, divergent spherical wavefront is reconstructed into collimated wavefront by compensating an optical path difference so as to enhance light extraction, and secondly, a linear phase gradient is superposed so that an optical axis of a whole outgoing beam generates a preset deflection angle. According to the invention, the functions of a complex optical system are integrated on a chip layer, and the integration of efficient collimation, directional emission and light extraction enhancement of light beams is realized.

The utility model discloses a transparent reflective optical system, which comprises a line light source system and an imaging system, the line light source system comprises a collimation unit and a reflection unit, in a vertical plane, the contour line of the reflection unit is a first parabola, the focus of the first parabola is located at the F point, the reflection unit is located in the light emitting direction of the collimation unit, the reflection unit is used for totally reflecting light emitted by the collimation unit, and in the vertical plane, the reflection unit is located at the F point. Reverse extension lines of the reflected light rays converge at a point F. The imaging system is provided with a total reflection surface which is located in the light emitting direction of the reflection unit, the section of the total reflection surface is of a V-shaped structure, the focal point of the imaging system is located at the point F in a vertical plane, and the imaging system is used for imaging a line light source passing through the point F. The utility model has the advantages that the use of an aluminum plating process is avoided, the optical efficiency and the optical performance are improved, and the production cost is reduced.

This utility model discloses a lampshade structure for an ultraviolet curing machine, including a lampshade body and an ultraviolet light source. The lampshade body has end caps at both ends. A reflector is coaxially mounted inside the lampshade body, with multiple reflective grooves formed along its circumference on the outer surface of the reflector. These reflective grooves and the inner wall of the lampshade body form a cooling channel. A centrifugal fan is installed on one side of the end caps, and the centrifugal fan is connected to the cooling channel. This utility model integrates an independent cooling channel within the circumferential wall of the lampshade body. The centrifugal fan drives the cooling airflow axially within the channel, forming a highly efficient directional heat dissipation path. This results in uniform heat dissipation and effectively prevents external contaminants from entering the lampshade, significantly improving heat dissipation efficiency and equipment reliability. By designing the cooling channel wall as an arc shape and also serving as the reflective layer substrate, structural and functional integration is achieved, making the lampshade structure more compact and its optical efficiency higher.

The invention provides an analysis method for screening fetus trisomy 21 syndrome, and belongs to the technical field of inspection and detection.According to the method, methylated HLCS, C21orf25 and RASSF1A genes from placenta are detected at the same time, and the method comprises the following steps that methylation sensitive restriction enzyme cutting is conducted, specifically, after maternal peripheral blood is collected, DNA is extracted, and unmethylated CGCG loci are selectively cut through BstUI; light-driven amplification: carrying out isothermal amplification under the irradiation of an external coaxial reflection LED light source by utilizing a photosensitizer Bi2MoO6 (at) NiS, and initiating a multiple light-driven LAMP reaction by taking placenta-derived methylated HLCS, C21orf25 and RASSF1A genes in maternal peripheral blood as templates respectively, so as to obtain a double-chain structure DNA amplification product; detecting by using photo-thermal test paper: modifying Bi2MoO6 (at) NiS by using three nucleic acid chains to obtain three photo-thermal signal probes; and mixing the amplification product with a photo-thermal signal probe, and carrying out photo-thermal temperature change detection to obtain a photo-thermal temperature change signal positively correlated with the content of the amplification product. According to the analysis method disclosed by the invention, the simultaneous amplification and efficient detection of the HLCS, C21orf25 and RASSF1A genes of the placenta specific genes, namely the highly methylated CGCG site are realized.

The application provides a kind of circular arc secondary mirror design method and contain circular arc secondary mirror's slot type light-gathering heat collection system, belong to solar light-gathering heat collection technical field. In order to solve the existing secondary reflection slot type light-gathering system's parabolic surface type, composite parabolic surface type and flat plate type curve structure complex, it is easy to cause light-gathering effect to be poor due to processing error;Secondary reflection mirror installation and use will cause the defocusing phenomenon caused by mirror shape error and tracking error to cause the deflection of incidence angle, affect light-gathering effect problem. The application is by installing a kind of circular arc secondary mirror, and the radius, position and width of circular arc secondary mirror are calculated, to ensure that the reflected light through the secondary mirror is maximized to irradiate on the heat collecting tube, to improve the optical efficiency while reducing the processing difficulty.

The embodiment of the invention provides a light guide device, an optical module and head-mounted display equipment. The light guide device comprises a light guide substrate, a coupling-in area and a coupling-out area, wherein the coupling-in area and the coupling-out area are arranged on the light guide substrate. The coupling-out area is used for performing pupil expansion and coupling-out on the light from the coupling-in area; the coupling-out region comprises a two-dimensional grating region and a transition grating region; the two-dimensional grating area is located in the middle of the coupling-out area, and the at least two transition grating areas are arranged on the two opposite sides of the two-dimensional grating area respectively; the two-dimensional grating area comprises a first grating, the transition grating area comprises a second grating, both the first grating and the second grating can realize double-side diffraction on light transmitted to the first grating and the second grating, and the second grating rotates at a preset angle on the surface of the light guide substrate relative to the first grating. And the light intensity of at least one side diffraction order of the light transmitted to the second grating position is adjusted.

The color car lamp projection module comprises a PCBA board, a radiator, a color wheel assembly, a lens support assembly and a lens, a light source is arranged on the light emitting side of the PCBA board, the radiator is connected with the PCBA board, corresponding installation through holes are formed in the radiator and the PCBA board, one end of the color wheel assembly penetrates through the installation through holes to be fixed to the back face of the radiator, and the other end of the color wheel assembly penetrates through the lens support assembly to be fixed to the lens support assembly. The color wheel assembly comprises a color wheel, a color wheel motor, a motor support, a color wheel shaft and a color wheel support, one end of the color wheel shaft is connected with the color wheel, the other end of the color wheel shaft penetrates through the motor support to be connected with a motor shaft of the color wheel motor installed on the color wheel shaft, and the motor support is connected with the radiator through the color wheel support. The lens support assembly is arranged on the light emitting side of the PCBA board, the lens is arranged at one end of the lens support assembly, and light emitted by the light source completely covers a light inlet of the lens after passing through the light cone range boundary of the color wheel. Radiating fins and a fan are arranged on the back surface of the radiator; and a strong convection area of the fan covers the light source and the radiating surface of the color wheel assembly.

The invention provides a miniature LCOS projection illumination system with double laser light sources, and belongs to the technical field of miniature laser projection display. The device comprises a light source module, a modulation module and a lens module which are sequentially connected, the light source module comprises a three-primary-color laser and a red laser, the three-primary-color laser and the red laser are located on the same side of the lens module and are parallel to the central axis of the lens module, and a red light source in the three-primary-color laser is opposite to the red laser. A blue light source and a green light source of the three-primary-color laser device are not coaxial with a light path of the red laser device, red light of the three-primary-color laser device and red light of the red laser device are modulated by the half-wave plate and reflected by the dichroic mirror in sequence, and blue light and green light of the three-primary-color laser device pass through the spectroscope and the first reflector in sequence. The two paths of blue light and green light are combined with the two paths of red light respectively to form two paths of three-color laser. The invention has the advantages of miniaturization, high brightness, high color saturation and high contrast.

The invention provides a high-efficiency high-precision multiband transmitting and receiving common-path beam combining system, and belongs to the technical field of photoelectric equipment. When the common-optical-path beam combining system is in a debugging state, the cut-in and cut-out reflecting mirror is located in an optical path of the common-optical-path beam combining system, and the sampling optical path assembly receives first-wave-band light or second-wave-band light reflected by the cut-in and cut-out reflecting mirror and forms light spots on a focal plane in the sampling optical path assembly. Meanwhile, diffuse reflection return light of the light spots returns to the spectrum beam combiner along an original light path, first-band light of the light spots penetrates through the spectrum beam combiner to reach the first-area beam combiner, a reflecting surface of the first-area beam combiner reflects the first-band light to the first receiving electrically-tunable reflector, second-band light of the light spots is reflected by the spectrum beam combiner to the second-area beam combiner, and the second-band light of the light spots is reflected by the second-area beam combiner to reach the second receiving electrically-tunable reflector. And the second area beam combiner reflects the second wave band light to the second receiving electrically tunable reflector. According to the invention, the transmitting optical paths and the receiving optical paths of multiple wavebands are combined at the same time, and the device has the advantages of high optical efficiency and high optical axis precision.

The invention discloses a projection optical system and laser projection equipment. The projection optical system comprises a projection light source, a first illumination light path, a phase light modulation device, an optical coupling array, a second illumination light path, a display device and a lens. A laser light source emitted by the projection light source is shaped by the first illumination light path and then enters the phase light modulator for phase modulation, a modulated diffracted light beam enters the light coupling array, and the light coupling array not only can couple primary-order diffracted light into the second illumination light path, but also can couple secondary-order diffracted light into the second illumination light path. In addition, at least one level of high-order diffraction light can be coupled into a second illumination light path, so that more diffraction light can be used for a subsequent imaging light path, and the optical efficiency is improved. The energy distribution of the diffracted light beam entering the second illumination light path is modulated according to the brightness distribution of the to-be-displayed image, and after amplitude modulation is carried out through the display device, the brightness-darkness contrast in the displayed image can be remarkably improved, and the display requirement of HDR is met.

The invention relates to a near-to-eye display device, an optical system and electronic equipment, the near-to-eye display device comprises a first optical lens and a second optical lens which are superposed, the first optical lens is provided with a first outer surface and a first inner surface, the second optical lens is provided with a second outer surface and a second inner surface, the first outer surface is a surface close to the environment side, the second outer surface is a surface close to the human eye side, at least part of the first outer surface is a curved surface, at least part of the second outer surface is a curved surface, and the first inner surface and the second inner surface are both planes. A coupling-in grating is arranged on one surface of at least one of the first optical lens and the second optical lens, the area where the coupling-in grating is located is a plane, and a coupling-out grating is arranged on at least one of the first inner surface and the second inner surface.