How to play image flat-screen tv
(57) Abstract:The method used in optoelectronic information technology. The method comprises withdrawing the light fluxes of N planar waveguides in the layer of ferroelectric liquid crystal. Each of the N converted by the conversion unit of policity light fluxes enter in the I-th planar waveguide without shell and spread light stream through total internal reflections created by the bottom and side faces of the groove matrix, which is attached to the waveguide, and the top face of the formed liquid crystal layer. To output light flux of the planar waveguide is served on the upper and lower electrodes voltage that generates an electric field with a direction perpendicular to the direction of propagation of the light flux. Injected luminous flux of the layer of liquid crystal in a cylindrical waveguides without sheath through the side faces directed perpendicular to the direction of propagation of the light flux. Choose this refractive index cylindrical waveguides, which will provide through the layer of optical adhesive and the protective plate full output of the light flux in open space. Prov.Amy way relates to the field of optoelectronic information engineering and can be used to build systems images are displayed.Known methods of image playback screen, for example, the methods discussed in the author's certificate N 1656587 from 15.02.91 (priority 24.05.89), in U.S. patent N 5150445 from 22.09.92 and in PCT patent WO 93/09450 from 13.05.93. The method discussed in the author's certificate N 1656587 based on the use of light reflected from the boundaries of different refractive indices, the generated electric field (see Fig. 10). The nearest analogue can be attributed to the method described in patent PCT WO 93/09450 (PCT/US 91/08109) from 13.05.93.Analogue has the following disadvantages:
1. The low efficiency of the playback image.This is due to the output of the light flux from the waveguide through its shell and the scattering layer 21 of Fig. 8, contains minerals, which scatter light in all directions, and a large proportion of the luminous flux reflect. Such a large share of the loss of the luminous flux does not depend on how the conclusions of the light flux from the waveguide electro-optical, thermo-optical, acousto-optical and magneto-optical. With the aim of improving efficiency in the patent PCT is considering another way of output light flux through the reflective mirror of Fig. 9. However, to ensure such a conclusion Shu the proportion of the luminous flux from the waveguide, and the main share of light when it is reflected back.It should be noted that to increase the share of output light by multiple output light from the waveguide is also impossible, as by increasing the length of the segment that outputs light waveguide, mix different signals. Thus, the output light by means of inclined mirrors Fig. 9 also has a low efficiency.2. Small resolution of the reproduced image.Dealt with in similar ways output light beams from the waveguide based on the multiple refraction of light at a certain segment of the waveguide. This fundamentally limits the increase in resolution, in addition, due to the low efficiency of the light output segment output light waveguide cannot be reduced more than a certain length.The aim of the invention is to increase the efficiency and resolution of the reproduced image flat-screen TV.To achieve the goal of the proposed method contains: process output light fluxes of N planar waveguides in the layer of ferroelectric liquid crystal, for which each of the N transformed block preobrazovannoe flow through total internal reflection, created by the bottom and side faces of the groove matrix, which is attached to the waveguide, and the top face of the formed liquid crystal layer, and to output light flux of the planar waveguide is served on the upper and lower electrodes voltage that generates an electric field with a direction perpendicular to the direction of propagation of the light flux; and the process of entering light flux from the layer of liquid crystal in a cylindrical waveguides without sheath through the side faces directed perpendicular to the direction of propagation of the light flux, while choose this refractive index cylindrical waveguides, which will provide through the layer of optical adhesive and the protective plate full output of the light flux in the open space.Set out the essence of the illustrated variant of the method the device shown in the drawings, where:
in Fig. 1 depicts a fragment of the cross-section of the screen, containing planar waveguide without shell 1, the matrix-substrate - 2, an opaque electrode 3, a transparent electrode 4, the protective plate 5, a cylindrical waveguide without the shell 6, the layer of ferroelectric liquid crystal - 7, Fig. 1 labeled +U, -U, - ol is knogo section of the screen, showing the refraction of the light flux that contains all the same elements 1,2,3,4,5,6,7 Fig. 1 and a layer of optical adhesive 8, Fig. 2 denote: n0is the refractive index of open space, n1is the refractive index of the planar waveguide, n3is the refractive index of the substrate matrix, n4the refractive index of the ferroelectric liquid crystal without the electric field, n4the refractive index of the ferroelectric liquid crystal with an electric field, n5is the refractive index of the cylindrical waveguide without shell, n6is the refractive index of the protective plate and the optical adhesive;
Fig. 3 depicts a top view of the matrix-substrate - 9;
in Fig. 4 fragment - containing planar waveguides - 1, laid in the grooves of the matrix substrate 2 and the liquid crystal layer - 7;
in Fig. 5 depicts a bottom view of the matrix-substrate 10, which shows its fragment, containing the horizontal electrodes -
in Fig. 6 shows the protective plate 12 bonded thereto by a layer of cylindrical fibers - 13; Fig. 6 shown separately slices C and D, containing the protective plate 12 attached cylindrical waveguides without the shell 13, the horizontal e is ary waveguides - 16, flat optoelectronic screen - 17, Fig. 7 denote: X - input electrical signals.In Fig. 8 and 9 shows the device closest analogue containing planar waveguide 18, the shell of the waveguide 19, the electrodes 20, the scattering layer 21, an optical medium with a lower refractive index - 22. In Fig. 8 and 9 indicated: ~U, +U, -U, - electrical voltage. S0- output luminous flux of the signal, Sn1- lose the dispersion of the luminous flux, Sn2- lose internal reflection of the light flux.In Fig. 10 shows another device of similar author. testimony N 1656587 that implements the output light by an electric field formed by the voltage U, through the formation of boundaries between the different indices of refraction n1and n2and containing planar waveguide 23, a transparent electrode 24, an opaque electrode 25.Variant of the device that implements the proposed method operates as follows.The electrical signal X unit conversion - 15 is converted into an optical polarized policity video, which harness through the planar waveguides - 16 is fed to opto-flat panel display - 17. Optical) and the means of multiple reflections, created smaller refractive index n3substrate-matrix - 2 and n4liquid crystal 7 in comparison with the refractive index n1planar waveguide - 1.When the supply voltage U to the electrodes 3 and 4 is formed, the electric field direction perpendicular to the direction of propagation of light waves. This dramatically increases the refractive index n'4a layer of ferroelectric liquid crystal - 7, that is, the condition n41,1 n1and instead of total internal reflection of the light flux to the supply voltage U is applied at the electrodes, which was n41,1 n1the light output is almost completely come out of the waveguide 1 in the liquid crystal layer - 7 with a small angle of refraction. Thus, post-luminous flux is served on the side cylindrical waveguides without the shell with a refractive index of n5performing the condition n5>n'4where near the opposite face of the cylindrical waveguide is provided to focus the light flux contributing to almost full output it through the layer of optical adhesive 8 and the protective plate 5 with the same low refractive index of n6wtulich flows from planar waveguides increases the efficiency and resolution of the reproduced image is many times compared to analogue.The efficiency of the device in the implementation of the proposed method is confirmed by the results of experimental studies. How to play image flat-screen TV, in which the injected luminous flux of the layer of ferroelectric liquid crystal and output luminous flux from him in the waveguides, characterized in that the luminous flux is introduced into the layer of ferroelectric liquid crystal of N planar waveguides with a refractive index of n1what each of N converted by the conversion unit of policity light fluxes enter the 1st planar waveguide without shell and spread light stream it via total internal reflections created by the bottom and side faces of the groove matrix, which is nested in the waveguide, and the top face formed with a layer of ferroelectric liquid crystal, and served on the upper and lower electrodes voltage that generates an electric field with a direction perpendicular to the direction of propagation of the light flux, which increases the refractive index of the layer of ferroelectric liquid crystal to a value of nn1,1 n1and the luminous flux from the layer of ferroelectric secolare to the direction of propagation of the light flux, while choosing such a refractive index cylindrical waveguides, which will provide the complete output of the light flux in open space through the side faces of cylindrical waveguides, the optical glue layer and the protective plate.
FIELD: physics; optics.
SUBSTANCE: 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.
EFFECT: advanced design of information medium and facilitation of its use.
7 cl, 1 dwg
FIELD: fiber-optic communication lines.
SUBSTANCE: 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.
EFFECT: broader functional capabilities.
FIELD: optical engineering.
SUBSTANCE: 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.
EFFECT: improved efficiency; improved reliability of operation.
9 cl, 7 dwg
FIELD: tool-making industry, possible use for reading graphical and textual information, such as passport and visa documents at customs checkpoints, at customs control stations of airports, railroads and automobile roads.
SUBSTANCE: 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.
EFFECT: simplified design of the block for processing image of the object of reading.
4 cl, 21 dwg
FIELD: telecommunications; passive loop-architecture optical circuits.
SUBSTANCE: 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.
EFFECT: enhanced quantity of subscriber points in network, enlarged amount of hardware used in telecommunications.
4 cl, 5 dwg
FIELD: optical communications, in particular, laser atmospheric information transfer systems, possible use as single-hop communication line, for example, for setting up communication channel between two clients or between a client and a client access station.
SUBSTANCE: 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.
EFFECT: expanded dynamic range of communication line, increased reliability of device operation due to exclusion of fiber combining element, increased reliability, communication quality and information transfer speed due to ensured multi-wave multiplexing, time and frequency packing and encoding of information.
2 cl, 2 dwg
FIELD: physics, communication.
SUBSTANCE: 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.
EFFECT: increase of pass band of multimode fiber optic transmission line, reduction of optical power threshold required for formation of non-linear mode in fiber, reduction of differential mode delay of multimode optical fiber with notch in axis, expansion of application field.
SUBSTANCE: 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.
EFFECT: device enables uniform radial propagation of light entering the planar waveguide with maximum efficiency.
3 dwg, 1 tbl
SUBSTANCE: 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.
EFFECT: invention reduces labour consumption and power consumption of the process of making a planar waveguide which is resistant to radiation in the green spectral region and has maximum refraction index increment values.
1 dwg, 2 tbl, 3 ex
FIELD: physics, optics.
SUBSTANCE: 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.
EFFECT: high power density of radiation inside a periodic medium.
3 cl, 7 dwg
FIELD: physics, optics.
SUBSTANCE: 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.
EFFECT: higher distinction between refraction indices of the core and cladding and reduced losses of the optical signal transmitted through the waveguide.
FIELD: computer engineering, possible use for realization of computing systems, image construction systems, and also optic-electronic modulators.
SUBSTANCE: 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.
EFFECT: increased image quality.
6 cl, 10 dwg
FIELD: engineering of systems for displaying optical information.
SUBSTANCE: 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.
EFFECT: possible use of liquid-crystalline screen under heavier thermal conditions, for example, in aviation, due to circulation of coolant and due to prevention of contact of liquid-crystalline cells with polarization changers, heating up during operation.
3 cl, 1 dwg
FIELD: liquid-crystal displays.
SUBSTANCE: 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.
EFFECT: reduced angular aperture, enhanced light efficiency.
14 cl, 6 dwg
SUBSTANCE: 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.
EFFECT: reduced thermal load at high levels of illumination.
3 cl, 2 dwg
SUBSTANCE: 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.
EFFECT: improved reliability of operation; smaller sizes; increased brightness of information image onto screen.
12 cl, 4 dwg
SUBSTANCE: 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.
EFFECT: increased efficiency.
14 cl, 3 dwg
FIELD: aircraft engineering.
SUBSTANCE: 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.
EFFECT: enhanced reliability.
2 cl, 1 dwg