How to play image flat-screen tv

The invention relates to a device with a floating architecture and to a display device and can be used in computing

The invention relates to fiber optics and is industrially applicable in optical collimators radiation devices docking fiber, the spectral filters, optical isolators, and the sensors of physical quantities

The invention relates to optical testing and can be used for excitation of planar optical waveguides (PHS)

Invention relates to creation of images for data transmission and may be used in city advertising and modifiable information messages. Device comprises optical fibers, light generator and optically transparent plate. Optical fibers are connected to rear side of the plate. The plate is covered with renewable film information medium, which is coated with optically transparent material. Optical radiation from light generator is supplied to opposite ends of optical fibers by means of fiber-optic cable. Device may be floor- or wall-mounted indoors or embedded into pavement.

In the method, next to main multi-mode optic fiber to communication line a compensating multi-mode optic fiber is placed, profile of which is selected dependently on profile of main multi-mode optic fiber, while depth, width and shape of axial space of profile of diffraction coefficient of compensating multi-mode optic fiber is selected so, that differential mode delay between groups of lower order modes and higher order modes in main and compensating multi-mode optic fibers had opposite signs.

Optical attenuator can be used for attenuation of optical signals in optical communications, for optical measurements et cetera. Optical attenuator has dope which is capable of attenuating of transmitted light at higher degree when wavelength is longer than wavelength in single-mode optical fiber. Area of dope is limited in central part of core where refractivity is increased in relation to refractivity of peripheral part of core. The dope can be also limited in the direction to central part of core and refractivity in central part of core is increased in relation to peripheral part. Optical attenuator has dope which attenuates transmitted light at higher degree when wavelength of light is shorter in single-mode optical fiber. Area of dope is restricted in the direction of central part of core and refractivity in central part of core is increased in relation to refractivity of peripheral part. Area of dope can be also restricted in the direction of central part of core where refractivity is higher than refractivity of peripheral part of core. Optical attenuator equalizes optical attenuation of optical signals with wavelengths being close to each other. Difference in optical attenuation of optical signals can be maximized which signals have different wavelength at the condition when any characteristic of optical fiber is stable. Area of adoption is realized when its concentration is kept to relatively low level.

Device includes lighting device and, mounted serially: four-sided prism with a part for positioning object of reading, three-sided rectangular prism, flat-concave lens, objective, matrix photo-receiver and block for processing image of the object of reading, connected to the matrix photo-receiver. Prism system has height which is substantially less than the smallest linear dimension of the document being read. Light beam from illuminated object of reading after multiple reflections in prism system is focused by objective in matrix photo-receiver without geometrical distortions of image of the object of reading.

Proposed passive fiber-optic network has unidirectional fiber-optic loop, N directional couplers disposed at different points of loop, communication center, and plurality of subscriber points. Communication-center transmitter is optically coupled with fiber-optic loop sending end and receiver, with its receiving end. Transmitter and receiver of each subscriber point are optically coupled with fiber-optic loop through respective directional coupler inserted in fiber-optic loop. Directional couplers, from first to last ones, have rising branching coefficients from sending to receiving ends of fiber-optic loop at transmitter radiation wavelength of communication center and reducing branching coefficients on transmitter radiation wavelength of any subscriber point. Transmission is conducted in network in two streams: from communication center to subscriber points and from the latter to communication center.

Receiver-transmitter for optical communication device is made in form of external and internal blocks which are interconnected by a fiber light duct. The external block is made in all-weather form and contains a focusing system, and internal block is made for room conditions and contains emitters mounted on same substrate closely to each other, represented by laser diodes or light diodes, which constitute a source of optical radiation, and photo-elements, which constitute a receiver of optical radiation. Emitters and photo-elements, positioned on one substrate closely to each other, represent a matrix, engaged with the end of the fiber light duct and commensurate with its end. In the internal block, electronic blocks of emitter and receiver of optical radiation are positioned respectively, and also an interface.

Invention is related to fiber optic communication equipment and may be used to increase pass band of multimode fiber optic transmission line. Method for increase of pass band of multimode fiber optic transmission line consists in the fact that in gradient multimode optic fiber, core material is alloyed with non-linear additive, and at that core material is alloyed only within the limits of the main mode spot.

Waveguide has a bottom part with a conical cut of height h<H, where H is thickness of the waveguide. Input radiation propagates from the conical cut to edges of the waveguide. The disclosed waveguide also has a second conical cut on which a mirror coating is applied, coaxial to the conical cut in the bottom part.

Method of making a planar waveguide of zinc oxide on lithium niobate involves preparing a film-forming solution, holding said solution for 1 day at room temperature, depositing the solution on polished lithium niobate, drying, annealing and gradually cooling in natural cooling conditions of a muffle furnace. The lithium niobate is pre-treated with 96% ethyl alcohol solution. The lithium niobate with the deposited film-forming solution is dried at 60°C for 1 hour, followed by annealing at 400°C in an air atmosphere at heating rate of 14°/min for 1 hour and at 870-1050°C at heating rate of 35°/min for 2-5 hours, with the following ratio of components of the film-forming solution, wt %: zinc nitrate crystalline hydrate 5.2-9.9%; salicylic acid 4.6-4.8%; 96% ethyl alcohol solution - the balance.

Invention relates to optics and a method of increasing power density of optical radiation inside a medium. The method includes forming a medium in the form of a multilayer periodic structure having a band gap in the transmission spectrum, as well as narrow resonance peaks of full transmission and directing radiation into said medium, wherein the wavelength of said radiation matches one of the resonance peaks of full transmission.

Invention relates to the technology of producing optical waveguides, i.e., light-conducting and light-controlling structures, placed in a glass volume. The method of making a bulk waveguide includes moving a focused laser beam relative to a plate or a plate relative to a focused laser beam until the completion of formation of the waveguide and subsequent heat treatment of the plate with the waveguide in a furnace. Before forming the waveguide, a plate of porous optical material is placed in a chamber in which, at room temperature, relative air humidity is kept not lower than 60% and not higher than 80% for not less than 72 hours but not more than 96 hours. Local laser action is carried out by a focused laser beam in the plane of a layer lying at a depth equal to j the thickness of the plate, with power density not lower than 1.5·10⁴ W/cm² and not higher than 2.5·10⁴ W/cm². Movement of the focused laser beam relative to the plate or the plate relative to the focused laser beam is carried out with a speed of not less than 3 mcm/s but not greater than 20 mcm/s multiple times until the waveguide is formed. The plate with the waveguide then undergo heat treatment at temperature not lower than 870°C but not higher than 890°C for not less than 10 min and not more than 20 min, wherein heating of the plate with the waveguide to temperature not higher than 140°C is carried out at a rate of not more than 5°C/min, and the plate with the waveguide is cooled after heat treatment by turning off the furnace.

Device contains optic-electronic screen, including glass substrate, a layer of reflectors, two layers of electrodes, a layer of wave ducts, light-conducting layer, two layers of holograms, modulating layer, guiding, protective and bitmap layers, synchronization block, amplifiers of input and output, commutator of optical information, information block, consisting of wave front modulator, voltage modulator and block for controlling modulators.

Liquid-crystalline screen is proposed, which has gaps for coolant between walls of liquid-crystalline cell and polarization changers. For pumping air through gaps, draining ventilator is used, because air during that expands in area of gap and cools down more. To decrease thermal effect on liquid-crystalline cell from external radiation, it is proposed to apply anti-reflective cover to surface of liquid-crystalline cell. Effect of infrared radiation on liquid-crystalline cells from heated polarization changers is weakened by creating a layer with high refraction coefficient, included in composition of anti-reflective cover, made of material with high conductivity.

Proposed liquid-crystal display lighting system has sequentially disposed light source, optical system, optical film, polarization film, and microprism film; optical film is made of transparent material and has at least one optical element incorporating first refracting surface and opposing interconnected second refracting surface and reflecting surface, as well as side surfaces; light source is designed to generate diverging light beams; microprism film is designed to pass some portion of light beams through desired aperture and to reflect some portion of light beams in direction of reflecting surface whose external aperture is practically equal to that of first refracting surface; internal aperture equals that of second refracting surface; reflecting surface is designed to partially depolarize some portion of light reflected by polarization plate and for reflecting this portion of light and some portion of light beams reflected by microprism plate to polarization plate.

Liquid crystal screen can be used in systems for representation of optical data. At reduction in thermal load onto liquid crystal cell of liquid crystal screen at high levels of illumination, one or both polarizers of liquid crystal cell are doubled by additional polarizers, which have the same direction in plane of polarization and are disposed to have space in relation to first polarizers. There is transparent thermal insulator or cooling agent in space.

Device has control driver, spatial phase filter, containing modulating medium, connected with driver, vertical and horizontal profiled transparent electrodes and electron members for controlling refractivity of modulating medium. Spatial phase modulator is divided to pixels. Any pixel is located at are of crossing of horizontal and vertical electrodes. Random field of phase delay values is formed in pixels of spatial phase modulator due to change in spatial and time changes in random field of refractivity of modulating matter.

Lighting system comprises, at least, one radiation source, light-conductive layer and an array of light-emitting elements, positioned on the light-conductive layer. Light-emitting elements are made in form of truncated pyramids, lesser bases of which are positioned on the upper surface of the light-conductive layer with creation of optical contact, and side edges of light-conductive elements provide for reflection of light, entering through the base, in a direction which is normal to upper surface of light-conductive layer, while pyramids are made polygonal, greater bases of pyramids are adjacent to each other along perimeter, while the generating line of the side edges is a quadratic curve.

Liquid crystal screen comprises light sources of day illuminating positioned directly behind the liquid crystal cell with polarizers and generator of light flux, reflector positioned behind the generator of light flux, and unit for night illuminating. The reflector has openings for passing light from the unit for night illuminating. The openings are arranged uniformly over the area of the reflector.