60 results about "Laser display" patented technology

The invention discloses a laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spots and speckle signals under the condition of not depending on an expensive refrigerating system by optimizing an optical structure and a control strategy. The device comprises an imaging lens, a lens electric control module, a liquid crystal tunable optical filter module, an ND filter wheel, a driving mechanism of the ND filter wheel, a two-dimensional image sensor, a main control unit, a three-axis acceleration sensor, a PC host and a tested screen. A noise calibration piece preset in an ND filter wheel is used for collecting noise data in real time before each time of measurement, and noise deduction is carried out before the filter is switched, so that the timeliness and accuracy of data correction are improved; meanwhile, the integrated three-axis acceleration sensor is used for monitoring vibration, and when vibration exceeding a preset threshold value is detected, it can be judged that currently collected data is invalid, and re-collection is automatically triggered. The device is compact in structure, low in cost and suitable for the fields of laser display, projection calibration, high-brightness light source detection and the like.

The invention provides europium-doped silicate green fluorescent powder as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. The green fluorescent powder can generate narrow-spectrum green light with the peak value located at 532 nm under excitation of 450 nm blue light, the full width at half maximum is 46 nm, a white light LED device prepared based on the fluorescent powder has a 110% NTSC color gamut, and it is indicated that the green fluorescent powder has excellent application value in backlight display. The saturation threshold value of the fluorescent powder reaches 21.6 W / mm < 2 > under the excitation of 450nm blue laser, and the lumen at the moment reaches 1157.9 lm. The green fluorescent powder disclosed by the invention has the advantages of high luminous efficiency, narrow full width at half maximum, high light saturation threshold under blue laser excitation, high lumen efficiency and the like, and has application feasibility in the aspect of laser display.

The embodiment of the invention discloses a waveguide device and application thereof, and belongs to the technical field of waveguides, the device comprises a substrate layer and a waveguide layer superposed on the substrate layer, and the waveguide layer comprises a lower cladding, a core layer and an upper cladding which are superposed in sequence; wherein the core layer comprises an input section, an output section and arc turning sections located on the input section and the output section, a laser beam enters from the input section and exits from the output section, and the arc turning sections enable the laser beam to turn at a preset angle from the input direction to the output direction. Through plane integration and arc turning design, the occupied area of a silicon wafer is minimized, and miniaturized integration is realized; moreover, the laser beams are transmitted through the arc turning design, the silicon-based integration process is compatible, required elements are reduced, the assembly cost is reduced, and low-cost quantification of products is facilitated.

The invention relates to the technical field of laser display, in particular to a laser speckle suppression waveguide structure, a laser display device and a speckle suppression method. The laser speckle suppression waveguide structure comprises a substrate layer, a lower cladding, a waveguide core area and an upper cladding which are stacked from bottom to top. Wherein the waveguide core region comprises an input section, an arc turning section and an output section; the arc turning section is used for combining laser beams from different input sections and outputting the combined laser beams from different output sections in parallel; the waveguide structure is also provided with a waveguide phase disturbance part used for destroying laser transmission coherence and / or an electrically tunable phase modulation part used for destroying laser dynamic coherence. The invention provides a waveguide structure for laser speckle suppression, a laser display device and a speckle suppression method, and aims to solve the problems that a speckle suppression scheme in the prior art is poor in suppression effect, large in system size, low in integration level, high in optical loss and incapable of dynamically adapting to different display scenes.

The invention discloses a flexible laser backlight plate and a preparation method, and relates to the technical field of laser display, the flexible laser backlight plate comprises a volume scattering particle composite layer, a reflecting layer, a light guide main body layer and a connecting end, and an optical fiber side light leakage optical fiber group is arranged in the light guide main body layer; the connecting end is arranged at one end of the backlight plate and provided with a light inlet end face corresponding to the light inlet end of the optical fiber side light leakage optical fiber set. In the optical fiber side light leakage optical fiber group, the side leakage structures of the optical fibers are non-uniformly distributed along the length direction of the optical fibers, and preset brightness distribution can be formed in the light guide main body layer, so that the preset brightness distribution can be formed and kept on the light emitting surface of the flexible laser backlight plate in a bent or flattened state; the problems of light path change and uneven brightness caused by flexible deformation are effectively solved.

The application discloses a kind of laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spot and speckle signal under the condition of not relying on expensive refrigeration system by optimizing optical structure and control strategy.The device includes imaging lens, lens electric control module, liquid crystal tunable filter module, ND filter wheel and its driving mechanism, two-dimensional image sensor, main control unit, three-axis acceleration sensor, PC host and the screen to be measured.The noise calibration piece pre-stored in the ND filter wheel is used to collect noise data in real time before each measurement, and noise subtraction is carried out before the filter switching to improve the timeliness and accuracy of data correction;At the same time, the integrated three-axis acceleration sensor is used to monitor vibration, and when vibration exceeding the preset threshold is detected, it is determined that the current collected data is invalid and automatically triggers re-sampling.The application has compact structure and low cost, and is suitable for laser display, projection calibration and high-brightness light source detection and other fields.

The invention provides a magnesium-modified narrow-spectrum green luminescent material, a preparation method and application thereof, and a laser display device, and belongs to the technical field of luminescent materials. The magnesium modified narrow-spectrum green light-emitting material has excellent light-emitting performance, when x is equal to 0.2, the emission wavelength of the (Sr0. 8Mg0. 2) Ga2S4: 0.04 Eu < 2 + > narrow-spectrum green light-emitting material under excitation of 450 nm blue light is 537.7 nm, chromaticity coordinates are (0.2916, 0.6766), the half-peak width is 47 nm, and the external quantum efficiency reaches 53.1%, which obviously exceeds that of undoped modified SrGa2S4: Eu < 2 + > fluorescent powder (the external quantum efficiency is 33.1%). The liquid crystal display has important application prospects in wide-color-gamut liquid crystal display and laser display, and has important research significance and application value for promoting the development of high-end display (such as laser display).

The application relates to a field-induced modulation heterogeneous integrated photon display chip and a manufacturing method thereof, and a laser display system. The field-induced modulation heterogeneous integrated photon display chip comprises a first substrate, a monochromatic laser located on one side of the first substrate, a waveguide layer, a first modulator and a second modulator. The monochromatic laser is used for outputting light. The waveguide layer is located on the side of the monochromatic laser close to the first substrate and comprises a grating coupler, a beam splitter, an interferometer and an optical waveguide structure arranged in sequence along a first direction. The first modulator is used for performing primary frequency modulation on the light output by the monochromatic laser, and the first modulator is located on the side of the waveguide layer away from the first substrate. The second modulator is used for performing secondary frequency modulation on the light, and the second modulator is located on the side of the optical waveguide structure away from the first substrate. The application improves the color regulation and control capability of the field-induced modulation heterogeneous integrated photon display chip, optimizes the performance of the chip and reduces the size of the chip.

A laser display system 100 is configured to increase the dynamic range of a laser diode by modulating an operating current applied to the laser diode based on a desired sequence of brightness levels and a temperature of the laser diode. In some embodiments, a measuring circuit measures a voltage of the laser diode at a given current, which indirectly indicates the temperature of the laser diode, thus obviating the need for a direct measurement of temperature. In addition, in some embodiments, the measuring circuit identifies a threshold current of the laser diode based on a range of current values at which values of the current multiplied by the derivative of the voltage against the current vary relatively rapidly. By compensating for temperature effects and identifying the threshold current, a driver of the laser diode more precisely controls light output of the laser diode across an increased dynamic range.

The utility model relates to the technical field of building measurement, and discloses a wall flatness detection device which comprises an outer box and a measuring plate, the top of the outer box is provided with a laser detection device, the front side of the outer box is fixedly connected with a winding shell, the outer wall of the winding shell is communicated with an outlet, the winding shell is internally provided with a measuring tape, and the measuring tape is connected with the measuring plate. The right side of the measuring plate is arranged on the left side of the outer box, the front side of the measuring plate on the upper side is rotationally connected with a rotating block, one end of the measuring tape is installed on the right side of the rotating block, the front side of the measuring plate is fixedly connected with a handle, and the right side of the measuring plate is provided with a recording mechanism. According to the utility model, the laser emitted by the laser detection equipment is displayed on the measuring plate to measure the laser, the whole device is relatively small and is more convenient to carry, and the laser position displayed on the scales and the marking panel are used for counting data, so that the device is more convenient to use.

This invention belongs to the field of projection display technology, specifically disclosing a holographic optical element, including a substrate and a holographic recording layer disposed on the substrate. The holographic recording layer is made of holographic optical material, and a polarization hologram is recorded within the holographic optical material. This invention provides a holographic optical element primarily used in polarization recovery systems in fields such as laser display, optical projection, and polarized illumination. It is used to convert S-light in partially polarized light output from a laser into P-light, achieving polarization unification, thereby improving light energy utilization and solving the problems of large size, complex fabrication, and high cost of existing polarization recovery schemes.

The application provides a red nitride fluorescent powder and a preparation method and application thereof, and belongs to the technical field of rare earth luminescent materials. 1‑x Li x Al 5‑x Si x N7]:yEu 2+ , wherein 0.001<=x<=0.50 and 0.0005<=y<=0.20. The fluorescent powder is a nitride system, has strong light absorption at blue light 400-500nm, has an excitation peak peak value at about 460nm, can be effectively excited by blue light laser, can emit red fluorescent light under blue light excitation, has an emission peak peak value at 635-685nm which can be adjusted, has a half peak width of 75-90nm which can be adjusted, and has a very good contribution to high color gamut in display devices. The fluorescent powder has the advantages of strong luminous brightness, high luminous efficiency and stable physical and chemical properties when used in various laser display devices with blue high-power laser as an excitation source.

A laser (800), a light source apparatus (10) and a laser projection device, belonging to the field of laser display. The laser (800) comprises: a light-emitting chip (801), a reflecting prism (802) and a collimating lens (803). The light-emitting chip (801) is used for emitting laser light in a third direction (Z), the angle of divergence of the laser light in a first direction (X) being smaller than the angle of divergence of the laser light in a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) being perpendicular to each other. The reflecting prism (802) has a reflecting surface (SR), the reflecting surface (SR) being located on a light-emitting side of the light-emitting chip (801). The collimating lens (803) has a light incident surface (S1) and a light-emitting surface (S2), the reflecting prism (802) being used for reflecting the laser light to the light incident surface (S1) of the collimating lens (803). At least one of the reflecting surface (SR) and the light incident surface (S1) is a target curved surface, the target curved surface being used for reducing the difference between the angle of divergence of the laser light in the first direction (X) and the angle of divergence of the laser light in the second direction (Y). Adjusting the angles of divergence of the laser light in the first direction (X) and in the second direction (Y) renders energy distribution uniform, improving the display effect of projected pictures.

An optical waveguide combiner having an output coupler comprising an array of embedded partially reflective dielectric mirrors expanding and coupling a virtual, optionally color, image generated by a laser display engine into a user EMB, wherein the dielectric mirrors are configured having a wavelength band for each lasing band of the laser display engine that includes wavelengths of light in the lasing band and in a range of wavelengths over which the lasing band is expected to drift, a reflectivity angular range exhibiting a first reflectivity, a transmittance angular range exhibiting a second reflectivity less than the first reflectivity, and a see-thru angular transmittance range having high transmittance for natural light incident on the facets.

The embodiment of the invention belongs to the laser display technology, and provides a laser and a display device, and the laser comprises a light-emitting chip which emits laser in a third direction, and the diffusion angle of the laser in a first direction is smaller than the diffusion angle of the laser in a second direction; the reflecting prism comprises a reflecting surface and reflects the laser to the collimating lens; the collimating lens comprises a light incident surface and a light emergent surface, the light emergent surface is a curved surface, and the laser is collimated and emitted in the first direction and the second direction; the target surface is a curved surface and is used for enabling the diffusion angle of the light beam emitted from the target surface in the first direction to be larger than the diffusion angle of the light beam irradiated on the target surface in the first direction and / or enabling the diffusion angle of the light beam emitted from the target surface in the second direction to be smaller than the diffusion angle of the light beam irradiated on the target surface in the second direction; and the target surface comprises a reflecting surface of the reflecting prism and / or a light incident surface of the collimating lens. The diffusion angles of the laser in the first direction and the second direction are adjusted, so that energy distribution is uniform, and the display effect of a projection picture is improved.

The invention discloses a high-saturation-threshold and high-luminous-efficiency composite fluorescent material for laser display and a preparation method of the high-saturation-threshold and high-luminous-efficiency composite fluorescent material. The composite fluorescent material comprises a sapphire substrate, and a conical array microstructure is etched on the surface of the sapphire substrate by adopting a photoetching-inductively coupled plasma process and is used for improving the light extraction efficiency; the inorganic silica gel fluorescent powder is filled in the microstructure and is used for reducing total reflection; the sapphire substrate and the inorganic silica gel fluorescent powder form the composite fluorescent material through low-temperature curing. The composite fluorescent material disclosed by the invention can bear the excitation power density of 40W / mm < 2 >-50W / mm < 2 > and the luminous efficiency of 240-260lm / W under the excitation of blue light LD with the wavelength of 450nm.

The application discloses a kind of multilayer optical film and its preparation method, imaging device, including providing optical glass substrate, anti-reflection layer is deposited on optical glass substrate, anti-reflection layer is designed using split film design algorithm, and designed split pattern is transferred to anti-reflection layer;High damage threshold protection layer is deposited on anti-reflection layer, heat management layer is deposited on high damage threshold protection layer, reflective layer is deposited on heat management layer by evaporation, form multilayer film structure, the interface bonding force between multilayer film structure is improved by annealing treatment to the multilayer film structure formed, set annealing condition is preset temperature, to obtain multilayer optical film;Through the optimization design of whole preparation process, and give consideration to anti-laser damage capacity, heat management layer provides thermal stability, reflective layer improves the efficiency of optical system, to manufacture high performance, multifunctional multilayer optical film, adapt to the high requirements of laser display system.

The present invention relates to the technical field of rare earth luminescent materials and provides a red nitride phosphor, and a preparation method therefor and a use thereof. The chemical composition of the red nitride phosphor of the present invention is Sr2[Mg1-xLixAl5-xSixN7]:yEu2+, wherein 0.001≤x≤0.50 and 0.0005≤y≤0.20. The phosphor is based on a nitride system, exhibits strong light absorption of blue light at 400-500 nm, has an excitation peak value of about 460 nm, can be effectively excited by blue laser light, can emit red fluorescence under blue light excitation, has an emission peak value adjustable in the range of 635 nm to 685 nm and a full width at half maximum adjustable in the range of 75 nm to 90 nm, and greatly contributes to high color gamut in display devices. The phosphor, when used in various laser display devices using blue light high-power lasers as excitation sources, has the advantages of strong luminous brightness, high luminous efficiency, and stable physical and chemical properties.

The invention relates to a reflective fluorescent glass converter with heat dissipation through holes as well as a preparation method and application of the reflective fluorescent glass converter. The reflection type fluorescent glass converter comprises a heat dissipation substrate (4), a reflection layer (3), a fluorescent glass layer (2) and a scattering layer (1) which are stacked and arranged layer by layer, a penetrating heat dissipation through hole array is arranged on the heat dissipation substrate (4), and each heat dissipation through hole (5) is filled with high heat conduction metal. The heat dissipation performance of the fluorescent glass layer (2) is effectively improved through the heat dissipation through hole array and the filled high-heat-conduction metal, and the scattering layer (1) covering the surface of the fluorescent glass layer (2) is combined to assist heat conduction and heat dissipation. The problem that a single-side heat dissipation structure of a traditional reflection type fluorescent glass converter is prone to generating thermal deposition on the outer surface away from the heat dissipation substrate (4) under the high-power condition is thoroughly solved. The reflective fluorescent glass converter has the advantages of high light-emitting saturation threshold, high light extraction and the like, and can be applied to the fields of high-power laser illumination, laser display and the like.

The invention discloses a laser hovering emergency flight traffic light system based on intelligent scheduling and multi-source perception. The flight execution unit can precisely hover above a road, and the height and the position are adjusted according to a task instruction; the sensing acquisition unit acquires traffic flow, signal lamp state and environment brightness information in real time; the instruction scheduling unit automatically identifies a signal fault area according to the sensing data, plans a flight path and a hovering position of the unmanned aerial vehicle, and sets a display time sequence and duration of a laser signal; the laser display unit projects red, yellow and green light beams in the air to replace a ground traffic light for traffic indication; the local emergency control unit can independently execute a pre-stored rule when communication is interrupted, and continuous output of traffic signals is kept; the system can realize multi-unmanned aerial vehicle cooperative scheduling through a wireless network, has the characteristics of quick response, flexible deployment and high reliability, and remarkably improves the safety and command capability of urban traffic in an emergency state.

The invention provides high-color-purity fluorescent powder as well as a preparation method and application thereof, and belongs to the technical field of fluorescent materials. According to the high-color-purity fluorescent powder disclosed by the invention, the luminescent spectrum conversion from blue to red of the fluorescent powder can be realized in the same system by controlling the sintering time. The obtained blue fluorescent powder can be combined with a near ultraviolet chip to realize a white light LED, and the obtained high-color-purity red fluorescent powder can be combined with a blue light chip to be widely applied to the field of white light LED illumination or laser display. According to the high-color-purity fluorescent powder, the thermal stability of the fluorescent powder at the working temperature is improved through Mg < 2 + > partial substitution.

The embodiment of the present invention relates to the field of laser display technology, and discloses a liquid crystal display device and a head-up display system. The liquid crystal display device includes: a liquid crystal display device, including: a laser light source, a reflector, a driving device, a controller, and a display module; the driving device is connected to the reflector, the controller is connected to the driving device, and the reflector is arranged between the laser light source and the display module; the laser light source is used to emit a laser beam, the reflector is used to receive and reflect the laser beam to the display module, and the controller is used to control the driving device to drive the reflector to move so that the laser beam reflected by the reflector covers the entire back of the display module to provide backlight for the display module. In the above manner, this embodiment can solve the problem of the display module heating up due to long-term exposure, and can enhance the image brightness.

The embodiment of the invention belongs to the laser display technology, and provides a laser light source which comprises a plurality of light-emitting chips and a plurality of collimating lenses corresponding to the light-emitting chips. The light-emitting chip comprises a plurality of light-emitting points, the light-emitting points are used for emitting laser in the third direction, and the diffusion angle of the laser in the first direction is smaller than the diffusion angle of the laser in the second direction; the collimating lenses are located on the light-emitting sides of the corresponding light-emitting chips and used for collimating the laser in the first direction before light spots corresponding to the laser emitted by the multiple light-emitting points in the light-emitting chips are overlapped. The laser in the first direction can be collimated, the collimation degree of the laser in the first direction is improved, meanwhile, separation of light spots corresponding to the laser emitted by the multiple light-emitting points is achieved, for a projection system comprising the diffractive optical element, the efficiency of the diffractive optical element is improved, and then the efficiency of the projection system is improved; and meanwhile, the overlarge light spot size is avoided, and the design difficulty of a subsequent optical system is reduced.

The invention relates to a negative liquid crystal material with high birefringence and wide nematic phase temperature as well as a preparation method and application thereof, and belongs to the technical field of preparation of liquid crystal materials. The technical problem of small birefringence of a negative liquid crystal material in the prior art is solved. According to the negative liquid crystal material with the high birefringence and the wide nematic phase temperature, the birefringence of the negative liquid crystal material is improved by adding the side fluorophenyl diphenylethynyl isothiocyanate compound, the birefringence delta n value is 0.15-0.31, and the nematic phase temperature is about-30 DEG C to 137.6 DEG C. The invention also provides a general formula suitable for the liquid crystal material to form the negative liquid crystal. According to the negative liquid crystal material with the high birefringence and the wide nematic phase temperature, the birefringence (delta n) of the negative liquid crystal material is improved by adopting the lateral fluorophenyl diphenylethynyl isothiocyanate compound, and the negative liquid crystal material is mainly suitable for the fields of spatial light modulators, laser display, 3D display and the like.

The invention discloses a perovskite quantum dot glass film composite material and a preparation method and application thereof. The preparation method comprises the following steps: blending glass powder containing CsPb (BrxI1-x) 3 quantum dots with an organic carrier to obtain heat conduction slurry; spin-coating the sapphire substrate with the heat-conducting slurry; the sapphire substrate coated with the heat conduction slurry is subjected to stepped heat treatment, and the heat treatment comprises a glue discharging step at the temperature of 150-250 DEG C and a high-temperature dense bonding step at the temperature of 500-600 DEG C, so that interface bonding between the glass film and the sapphire substrate is achieved. According to the invention, the interface-bonded perovskite quantum dot glass film is constructed on the sapphire substrate, so that the problem of hot stacking is effectively solved. The prepared composite material has a heat conductivity coefficient as high as 34.81 W / m.k, and a fluorescent color wheel device assembled based on the composite material shows a wide color gamut (the heat conductivity coefficient reaches 93.7% under the Rec.2020 standard) and high working stability under excitation of blue laser, and has a wide application prospect in the field of laser display.

The application relates to a laser projection device and a laser projection system. A depolarizer component is additionally arranged on a laser display light path between a light source and a light modulation component, so that birefringence and interference effects occur in the depolarizer component, and polarized light is converted into random polarized light. Birefringence caused by lens stress in the light modulation component usually has a fixed fast and slow axis direction, which can affect the polarization state of light passing through the lens. In the embodiments provided by the application, the depolarizer component can rotate around the light beam propagation direction in the working state. When the light beam passes through the lens each time, the polarization direction of the light changes relative to the axis of the stress birefringence. The phase delay caused by the stress has different effects in different directions, and the effects are offset after time averaging, so that the negative influence of the birefringence effect caused by the lens stress on the depolarization effect of the depolarizer component can be reduced, and the speckle contrast can be greatly reduced, and the speckle suppression effect is improved.

The application relates to an evaluation method, belongs to the technical field of laser display, and particularly relates to a method for evaluating color speckle in a laser display device. The application discloses a method for evaluating color speckle in a laser display, and the method comprises the following steps: a) obtaining a color speckle image from a laser display device; b) processing the color speckle image to extract color coordinates u' and v'; c) generating a sample covariance matrix V based on the color coordinates u' and v'; d) calculating eigenvalues alpha and beta of the sample covariance matrix V; and e) evaluating the distribution characteristics of the color speckle by using the square root of the ratio of the eigenvalues alpha and beta and the square root of the product of the eigenvalues alpha and beta. The application discloses an eigenvalue analysis method for evaluating the distribution characteristics of color speckle. By calculating the eigenvalues of the sample covariance matrix and the square root of the ratio and the square root of the product of the eigenvalues, the color speckle in the laser display device can be more accurately and intuitively evaluated, and valuable reference bases are provided for performance evaluation, fault detection and optimization improvement of the laser display device.

The present application relates to the field of laser unmanned aerial vehicle countermeasure and attack, and particularly relates to a self-adaptive array laser illumination device and an illumination control method of a laser unmanned aerial vehicle countermeasure system, the self-adaptive array laser illumination device comprises four groups of laser illumination emission modules and corresponding illumination laser self-adaptive adjustment systems, each group of laser illumination emission module comprises a laser driver module, a laser, a zoom laser illumination emission lens and a laser illumination emission window. The illumination laser self-adaptive adjustment system comprises a laser pointing two-dimensional adjustment mechanism and a laser pointing self-adaptive control module, and realizes the self-adaptive control function of the size and pointing of the illumination laser spot and the laser display combination mode. The present application can solve the technical problems of multiple targets being unable to be separately illuminated, low illumination power density, short effective illumination distance and blurred boundary of large targets.

The invention discloses a speckle elimination method and a laser display system, and belongs to the field of laser display. In order to reduce the influence of speckles, a feature map and a white map in a projection area are shot through a camera, the feature map is used for establishing projection area extraction information to facilitate subsequent extraction of the projection area in an image shot by the camera, and the white map is used for extracting a noise map according to distribution characteristics of pixel values of a local area; and then, according to the noise map and the connected region, judging whether to perform noise adding operation on an output image of the laser display system so as to achieve the purpose of suppressing speckles. According to the invention, the influence of laser speckles on the visual imaging effect can be improved without changing a curtain or an optical structure.

A laser display may include a light engine, which includes a laser diode and a temperature sensor configured to measure a temperature of the laser diode. The light engine may be coupled to a controller configured to determine a drive current for the laser diode to generate an optical power based on a threshold of the laser diode and an efficiency of the laser diode. The controller is configured to calculate the threshold and the efficiency of the laser diode at the measured temperature using a threshold model and an efficiency model of the laser diode, which are generated using a calibration process.