59results about How to "Change transmittance" patented technology

A liquid crystal-based light-intensity adaptive control system used in a free space laser communication system is provided, which comprises a signal emission unit (1) and a signal reception unit (2). The signal emission unit (1) consists of a laser (3) and an emitting optical system (4). The signal reception unit (2) consists of a beam condenser (5), a beam splitter (6), a liquid crystal-based adjustable beam attenuator (7), a receiving optical system (11), a CCD detector (12), and a receiving optical system (13), a photoelectric detector (14) and an adaptive controller (15), which are optically connected with the beam splitter (6) to apply electrical signals onto the liquid crystal-based adjustable beam attenuator. The invention utilizes the liquid crystal-based adjustable beam attenuator to attenuate the laser light intensity without using moving components; changes the voltage signal required for the liquid crystal-based adjustable beam attenuator based on the self-adaptive algorithm to change the transmittance thereof, thereby realizing the self-adaptive control of incident beacon lights; and ensures the laser energy received by the CCD detector stable within a dynamic range of 20dB.

The invention provides a triphenylamine self-powered electrochromic material, namely a compound (4-((4-(N, N-dimethylamine)phenyl)(phenyl)amino)benzyl)phosphonic acid and a synthesis method thereof. The invention also provides a self-powered electrochromic device containing the triphenylamine derivative. The novel triphenylamine derivative electrochromic material provided by the invention has double performance of photoelectric conversion and electrochromism; and the device consisting of the compound can realize the self-powering feature, namely that the device absorbs light energy and converts the light energy into electric energy for driving the device to change color. The novel device is simple in structure, low in preparation cost, green and environment-friendly and the like, and can be applied to the fields of buildings, automobiles, displays and the like.

A liquid crystal display includes a first substrate, a pixel electrode formed on the first substrate, a second substrate facing the first substrate, and a common electrode formed on the second substrate. The pixel electrode includes a first subpixel electrode disposed in a first subpixel region, and a second subpixel electrode disposed in a second subpixel region. A first voltage applied to the first subpixel electrode and a second voltage applied to the second subpixel electrode are different from each other, and a ratio of the first voltage to the second voltage is about 0.76 to about 0.80.

The invention discloses a transparent display, and the display comprises a field order drive part, a field order backlight part, and a liquid crystal panel. The field order backlight part comprises a red sub-field, a green sub-field, a blue sub-field, and a backlight control sub-field. The backlight control sub-field is a white sub-field or a black sub-field. The switching of the on/off states of the red sub-field, the green sub-field and the blue sub-field is carried out according to the time sequence through employing the field order technology, and then the red sub-field, the green sub-field and the blue sub-field are inserted into the backlight control sub-field, so as to enable the red sub-field, the green sub-field and the blue sub-field to be invalid and to form a fully-off frame. The invention also provides a transparent display adjustment method. According to the invention, the liquid crystal panel does not need to be divided into a display region and a transparent region, and the display is uniform in image display brightness and color, and has no brightness boundary. The method is simple and easy to operate.

The invention discloses an idle-sunning resistant flat-plate solar collector. The idle-sunning resistant flat-plate solar collector comprises an automatic light shading and heat insulating transparent cover plate, a solar absorber plate core, a heat-insulating back panel and a component frame, wherein a layer of temperature-sensitive phase-change dimming material or liquid crystal dimming film is compounded on the surface of the automatic light shading and heat insulating transparent cover plate. The invention has the following technical effects: when the interior of the flat-plate collector reaches a certain temperature due to idle sunning, the temperature-sensitive phase-change dimming material on the surface of the glass is subject to phase change, the transmission of the cover plate of the collector is changed, and the transparent state is switched to a light-tight sate, so that an automatic light shading function is performed, the solar absorber plate core is prevented from continuous heat absorption which results in temperature rise, accordingly, idle sunning is avoided, and the service life of the product is prolonged; and when the collector decreases to a certain temperature, the solar radiation transmission of the cover plate of the collector is changed, the light-tight state is switched to the transparent state, and the normal working state recovers.

The invention relates to the technical field of displaying, and discloses a display panel. The display panel comprises a CF (Colour Filter) substrate, wherein a plurality of pixel points are formed on the front side of the CF substrate; one pixel point comprises a plurality of sub-pixels. The display panel is characterized by comprising a first transparent conductive layer, a second transparent conductive layer, an electrochromic structure and a solid electrolyte, wherein the electrochromic structure is formed by an electrochromic material, and has a certain height; the first transparent conductive layer is formed on the back side of the CF substrate; the electrochromic structure and the solid electrolyte are formed between the first transparent conductive layer and the second transparent conductive layer; the solid electrolyte is formed on the periphery of the electrochromic structure. The invention further provides a display including the display panel and a method for manufacturing the display panel. Through the scheme of the invention, a visual angle can be controlled while the display quality is not influenced, and integration and thinning are facilitated.

The invention relates to a method for preparing a thermochromic film based on hollow VO2 nanoparticles with the particle size of 100 nm or below on a glass substrate and a flexible substrate, application and a preparation method of the hollow VO2 nanoparticles with the particle size of 100 nm or below, and the hollow VO2 nanoparticles with the particle size of 100 nm or below can be stacked and then applied to the glass substrate. The hollow VO2 nanoparticles below 100nm can also be dispersed into resin and applied to the flexible substrate, so that the application range of the thermochromic film is wider; the prepared thermochromic film can well realize high heat permeability at a low temperature in infrared invisible light, and can ensure high heat blocking capacity at a high temperature.

The invention discloses a magnetic induced light-dimming material, a local backlight adjustment membrane, a backlight module and display equipment and belongs to the technical field of liquid crystal display. The magnetic induced light-dimming material comprises a transparent substrate and a seta array which is distributed on the surface of the transparent substrate and formed by non-transparent, magnetic and elastic setae; shapes of the elastic setae relative to the transparent substrate can be changed between an upright state and a state of being attached to the surface of the transparent substrate under the control of an external magnetic field. The magnetic induced light-dimming material forms a magnetic induced light-dimming layer, and multiple electromagnetic units controlled by virtue of a micro circuit are arranged on the magnetic induced light-dimming layer, so that the local backlight adjustment membrane is obtained, each electromagnetic unit independently controls the shapes of the elastic setae in a preset region, corresponding to the electromagnetic unit, of the magnetic induced light-dimming layer to realize control of light transmittances of different regions of the magnetic induced light-dimming layer, and further local backlight adjustment is realized. Accurate local backlight adjustment can be realized by utilizing the magnetic induced light-dimming material.

A method for producing a porous thin film with variable transmittance, includes placing a polymer into an oven for an drying process to remove water vapor from the polymer and obtain a dry polymer; mixing the dry polymer, a salt and a solvent in accordance with a mixing ratio so as to obtain a first mixed solution; placing the first mixed solution into an ultrasonic vibrator, dissolving the salt to form a second mixed solution; coating the second mixed solution on a glass plate to form a solution thin film; placing solution thin film into an exhaust cabinet to obtain a composite thin film; and washing the composite thin film to remove the salt from the composite thin film to obtain a porous thin film wherein the polymer is a polyacrylonitrile, the salt is a lithium chloride, the porous thin film changes its transmittance via dry and wet state.

The invention discloses a high-pulse-contrast-ratio nanosecond fiber laser which comprises a pump laser, a pump combiner, a gain fiber, a fiber loop mirror and a fiber bragg grating. Lasers which are propagated along a fiber ring, in the clockwise direction and the counter clockwise direction, in the fiber loop mirror, are mutually intervened at the output port, the splitting ratio of the coupler is changed, power size of transmission light and reflected light can be changed, and the fiber loop mirror and the fiber bragg grating collectively form a resonant cavity. The high-pulse-contrast-ratio nanosecond fiber laser has the advantages of being compact in structure, good in stability, high in switching speed, and high in pulse contrast ratio. In addition, light leakage cannot occur when the high-pulse-contrast-ratio nanosecond fiber laser is used for marking and engraving and the like of sensitive materials, machining edges are clear, and effects are better.

The invention discloses an optical filter based on a nanopore array structure. The optical filter mainly solves the problems that an existing optical filter is complex in structure, large in machining difficulty and low in stability, and the same transmittance cannot be obtained for incident light in different polarization directions. The optical filter comprises a substrate (1), a metal film (2) and a nanopore array (3), wherein the metal film (2) is located on the substrate (1), the nanopore array (3) is etched on the surface of the metal film (2) by round holes (31) and regular rhombus holes (32) in a staggered arrangement mode according to a period P in rows or columns, and rows and columns where the round holes (31) are located are spaced from the rows and columns where the regular rhombus holes (32) are located by half a period, so that the distances from the center of any hole to the centers of the four adjacent holes around the hole are the same, and the transmittance of the optical filter is regulated and controlled by changing the period P. The optical filter is simple in structure, easy to manufacture and high in stability, can obtain the same transmissivity under the irradiation of incident light in different polarization directions, and can be used for spectrum reconstruction.

The invention provides a modified vanadium dioxide composite film and a preparation method thereof, and belongs to the technical field of building energy conservation. The preparation method comprises the following steps: 1) preparing the modified vanadium dioxide-polymer coating; (2) preparing a fluorescent organic small molecule-polymer coating; (3) preparing a polymer coating; and 4) preparing the modified vanadium dioxide composite film. The preparation method is simple and easy to implement and suitable for industrial production, and the intelligent temperature control glass prepared based on the scheme can be widely applied to building doors and windows. The prepared terminal product, namely the modified vanadium dioxide composite film, can regulate and control the sunlight intake according to the change of the external temperature, and plays a role in regulating and controlling the interior of a building to be warm in winter and cool in summer.

The invention discloses a reconfigurable TeraHertz wave super-diffraction focusing device based on voltage regulation and control, relates to the technical field of TeraHertz wave focusing, and solvesthe problems that an existing TeraHertz wave technology is based on a near-field optics principle although super-resolution focusing is realized, and focal length is extremely small so as to be difficult in meeting far-field high-resolution optical focusing requirements of application fields including biomedical imaging, remote sensing, security check and the like. The device has the technical scheme key point that the device comprises a silicon layer and a plurality of graphene layers abutted against the surface of the silicon layer, wherein the graphene layers are annular and are concentrically arranged, and adjacent graphene layers have the same interval; an insulation layer abutted against the silicon layer is arranged between the adjacent graphene layers; an electric conduction layercoats the surface of the insulation layer; and two sides of the electric conduction layer are independently abutted against the adjacent graphene layers. TeraHertz wave diffraction limitation is broken through, and a far-field high-resolution optical focusing effect is achieved.

The invention provides an adjustable minimal-beam electron beam device which has the advantages of simple structure, convenient operation, ultra-low energy, large area, small divergence angle and large dynamic range. The device comprises an electron gun with a grid electrode and a leading-out electrode, a first univoltage lens, a second univoltage lens and two grid meshes arranged in sequence, wherein a deceleration gap is formed between the two grid meshes; guide deflectors are arranged between the first univoltage lens and the second univoltage lens; the first univoltage lens is focused and imaged between the two pairs of deflectors; and the focus of the second univoltage lens is located at the imaging place. According to the low-energy electron beam device, the beams constantly maintain in a high-energy state during the flying process, severe deviation and various quadratic effect?influences of the ultra-low energy beam under the interference of an external magnetic field can be avoided; and in addition, when the energy is changed, parallel beams are always outputted only by adjusting the energy value, the adjustment is simple and convenient, and the repeatability and maneuverability of the device are greatly improved.

The invention relates to a resonant cavity structure based on a magneto-optical effect and a laser with the resonant cavity. The resonant cavity structure based on the magneto-optical effect comprisestwo laser high-reflectivity mirrors which are arranged at an interval, and a polarization device, a magnetic field generator and a magneto-optical material body which are arranged between the two laser high-reflectivity mirrors, wherein the magnetic field generator corresponds to the magneto-optical material body; a magnetic field generated by the magnetic field generator has a certain componentin the propagation direction of the oscillating beam at the current position; the magneto-optical material body changes the polarization direction of the oscillation light beam under the action of a magnetic field, and the oscillation light beam with the polarization direction changed by the magneto-optical material body is separated by the polarization device into an oscillation light beam whichcontinues to be oscillated and amplified in the resonant cavity and an output light beam which is separated from the resonant cavity to be output. The intensity of the output light beam is related tothe magnetic field intensity, the transmittance of the output light beam can be changed by changing the magnetic field intensity, and parts do not need to be replaced.

The invention provides a femtosecond laser pulse spectrum shaping device and usage thereof, which relate to the technical field of laser pulse amplification. The femtosecond laser pulse spectrum shaping device comprises a beam splitting element, a first reflecting element, a second reflecting element, and a receiving element; the distances between the first reflecting element and/or the second reflecting element and the beam splitting element can be adjusted in real time, so that the optical path difference between beams respectively passing through the first reflecting element and the secondreflecting element is adjusted; to-be-shaped femtosecond laser pulse can be split by the beam splitting element, so that one reflected part of the beam is reflected to the receiving element by the first reflecting element, and the other transmitted part of the beam is reflected to the receiving element by the second reflecting element. The invention is intended to mitigate technical problems in the prior art, for example, the optical path difference can only be changed by changing medium refractivity.

The invention relates to the technical field of optical fiber communication, and especially relates to an all-optical wavelength converter. The all-optical wavelength converter comprises a dielectric layer and an antenna layer which is formed on the surface of the dielectric layer and includes multiple periodically-arranged antenna structure units. Each antenna structure layer includes a first gap ring antenna, a second gap ring antenna and a square antenna with a square section, and the first gap ring antenna and the second gap ring antenna are symmetrically arranged on the two sides of the square antenna, wherein the first gap ring antenna and the second gap ring antenna are symmetric with any diagonal of the section as the axis of symmetry, and the gap of the first gap ring antenna and the gap of the second gap ring antenna face each other. The all-optical wavelength converter can achieve an all-optical wavelength conversion function, and is of simple structure and low cost. The application range of metamaterials is widened.