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425 results about "Luminous efficacy" patented technology
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Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source. Which sense of the term is intended must usually be inferred from the context, and is sometimes unclear. The former sense is sometimes called luminous efficacy of radiation, and the latter luminous efficacy of a source or overall luminous efficacy.
High efficiency leds and LED lamps
ActiveUS20120146066A1Reduce purchasesReduce operating costsPlanar light sourcesPoint-like light sourceLED lampLight-emitting diode
The present invention relates to a light emitting device comprising a plurality of electrically coupled light emitting elements, wherein each light emitting element has a luminous efficacy vs. current characteristic, wherein said luminous efficacy vs. current characteristic has a maximum luminous efficacy value and wherein at least one of said light emitting devices is operated at a current corresponding to a luminous efficacy value that is within 10% of said maximum luminous efficacy value. The present invention also relates to methods of making said light emitting device, to lamps comprising said light emitting device and to methods of operating said light emitting device.
Owner:COOLEDGE LIGHTING
High efficiency incandescent bulb replacement lamp
InactiveUS7600882B1Good load response variationImprove efficiencyNon-electric lightingLighting support devicesColor rendering indexIncandescence
The invention discloses a high efficiency incandescent and Compact Fluorescent (CFL) bulb replacement LED lamp having a good color reproduction. The LED light bulb includes two groups of semiconductor light emitters and a luminescent material to emit four different spectrums of light. The two groups of semiconductor light emitters are enclosed around an interior wall of the light bulb housing, which has a plurality of fins at an exterior surface for effective heat dissipation. A high reflective member having a dome shape in the center is disposed under the two groups of semiconductor light emitters to redirect the emission and excitation lights from the two groups of semiconductor light emitters and recycle the backscattered light for multi-spectrum light mixing. The LED-light bulb further includes a single power line connecting to the two groups of semiconductor light emitters and a high efficiency electrical AC / DC conversion and control device. The light bulb has a diffuser dome for an output window and a conventional Edison-mount screw-type light bulb socket, a conventional fluorescent tube coupler arrangement or a conventional halogen MR-16 socket arrangement connecting to an AC power base. If a voltage is supplied to the AC / DC conversion and control device, a mixture light from the diffuser dome produces a warm white light with a color rendering index of at least 85 and a luminous efficacy of at least 80 lumens per watt.
Owner:LEDNOVATION
Optical designs for high-efficacy white-light emitting diodes
InactiveUS20090001399A1Reduce internal reflectionsHigh refractive indexSolid-state devicesSemiconductor/solid-state device manufacturingPhosphorTransmittance
A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.
Owner:RGT UNIV OF CALIFORNIA
Template, method for manufacturing the template and method for manufacturing vertical type nitride-based semiconductor light emitting device using the template
InactiveUS20120187444A1Relieve pressureAvoid misalignmentAfter-treatment apparatusPolycrystalline material growthChlorideLight emitting device
Disclosed herein is a method for manufacturing a template. The method includes growing a first nitride layer on a substrate; etching a top surface of the first nitride layer by supplying a chloride-based etching gas thereto; forming a plurality of first voids by growing a second nitride layer on the top surface of the first nitride layer; etching a top surface of the second nitride layer by supplying the etching gas thereto; and forming a plurality of second voids by growing a third nitride layer on the top surface of the second nitride layer. A method for manufacturing a nitride-based semiconductor light emitting device using the template is also disclosed. As a result, stress between lattices and dislocation defects are reduced by a plurality of voids formed in a nitride buffer layer, thereby improving quality of nitride layers grown in a template. In the case where a light emitting device is manufactured using the template, it is possible to improve workability of the manufacturing process and to enhance luminous efficacy of the light emitting device.
Owner:SEMIMATERIALS +1
Color OLED device having improved performance
ActiveUS7091523B2Improve color gamutElectroluminescent light sourcesSolid-state devicesGamutBroadband
Owner:GLOBAL OLED TECH
Optical designs for high-efficacy white-light emitting diodes
InactiveUS7868341B2High refractive indexReduce reflectionSolid-state devicesSemiconductor/solid-state device manufacturingPhosphorTransmittance
A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.
Owner:RGT UNIV OF CALIFORNIA
Long lifetime polymer light-emitting devices with improved luminous efficiency and improved radiance
InactiveUS6849869B1Improve reflectivityImprove work functionSolid-state devicesSemiconductor/solid-state device manufacturingRadianceHigh reflectivity
The luminous efficiency and radiance of light emitting diodes (LEDs) fabricated from organic emissive materials can be increased by using a multilayer cathode including a low work function layer and a high work function high reflectivity layer, in combination with a high work function, high reflectivitity anode material in the device.
Owner:DUPONT DISPLAY +1
Method for improving luminous efficiency of GaN based LED by using graphic underlay
InactiveCN101345274AImprove luminous efficiencyQuality improvementSemiconductor devicesGraphicsNucleation
The invention provides a method which uses a graphic substrate to improve the illumination efficiency of a GaN-based efficiency, comprising the steps as follows: a silicon dioxide film is deposited on a sapphire substrate; a photoresist graphic array is optically etched; the photoresist graphic array is taken as a mask so as to etch the silicon dioxide film with the graphic structure; the silicon dioxide film with the graphic structure is taken as a mask so as to etch the sapphire substrate and the graphics is etched onto the sapphire substrate; the sapphire substrate is thoroughly cleaned so as to form a pyramid structure with triangular sections; a low-temperature nucleation layer grows on the graphic sapphire substrate; temperature is continuously increased on the low-temperature nucleation layer so as to grow an n-typed mixed GaN layer and an array structure which has low dislocation density and V-shaped holes on the surface; a multiple quantum well layer and a p-typed material layer required when the LED structure material grows continue to grow; furthermore, the final surface is led to still have the array structure with V-shaped holes.
Owner:YANGZHOU ZHONGKE SEMICON LIGHTING
Intelligent ghost-eliminating method
InactiveCN1641727AExtended service lifeImprove luminous performanceCathode-ray tube indicatorsImaging processingHigh luminance
The invention discloses a method to intelligent eliminating ghost. It includes the following steps: digitalizing the image processing signal; judging the image whether static according to the image signal; judging the last display time span whether exceeding the preset value; if the span time exceeding the preset value, supplying light emitting function recovering chance for the imate. Thus, the light emitting function of the high brightness area would maintain longer, and because naked eye is not sensitive to the small and slow change of location and brightness, it doesn't influence the visual effect and can effectively decrease the chance of having ghost. Thus, the using life of the monitor would be prolonged.
Owner:SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
Method for enhancing luminous efficiency of multiquantum well of semiconductor diode
ActiveCN102368519AImprove crystal qualityBlock pass chanceSemiconductor devicesElectron holeQuantum well
The invention discloses a method for enhancing the luminous efficiency of a multiquantum well of a semiconductor diode. A novel gradient growth method is adopted as a multiquantum well growth manner of an epitaxial wafer structure of a light emitting diode; in the multiquantum well structure, InGaN components in the first several periods are gradually increased, so that the stress generated in the growth process of suddenly transferring GaN to InGaN with high In components is eased, and thus the polarization effect is reduced, the crystal quality of the quantum well is improved, and the compounding possibility is increased. In addition, the thicknesses of barrier layers in the first several periods are gradually reduced, the speed of electrons and the traversing possibility of electrons can be reduced by the barrier layers with larger thickness, the traversing possibility of electron holes can be increased by the barrier layers with smaller thickness, so that the electrons and the electron holes are distributed more uniformly and the problem of the reduced efficiency under high current injection is avoided, and therefore the luminous efficiency of the multiquantum well is improved.
Owner:HC SEMITEK ZHEJIANG CO LTD
Porous graphene and graphene quantum dot and preparation method of porous graphene and graphene quantum dot
ActiveCN104555999AUniform pore size distributionExcellent oxygen reduction catalytic activityPorous grapheneCvd graphene
The invention discloses porous graphene and a graphene quantum dot. The porous graphene comprises, but is not limited to 2-9 atomic layers, wherein each atomic layer simultaneously comprises crystal lattices and holes of graphene, but is not limited to the holes of which the apertures are 2-10nm; the area of the holes accounts for about 5%-40% of total area of each atomic layer. The graphene quantum dot is characterized by comprising 1-5 atomic layers; the boundary is in a sawtooth shape; and the dimension of the quantum dot is 2-10nm. The porous graphene disclosed by the invention is uniform in aperture distribution, and not equal in interlayer spacing; and the graphene quantum dot has the advantages of high luminous efficacy, good crystal form and few defects.
Owner:SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
Display panel driving method and display apparatus
A method of driving a display panel is provided. The display panel includes a first scan group including first to third scan lines, and a plurality of data lines which intersect the first to third scan lines, and first display cells of a first color which are connected with the first scan line, second display cells of a second color which are connected with the second scan line, third display cells of a third color which are connected with the third scan line. The method is achieved by precharging the data lines to a predetermined voltage in a first horizontal period; and by supplying a data signal to the first to third display cells through the data lines driving of the first to third display cells after the data lines are precharged in the first horizontal period. In the driving of the first to third display cells, one of the first to third display cells corresponding to one of said first to third colors, having a maximum spectral luminous efficacy, is first driven.
Owner:NEC ELECTRONICS CORP
Device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder
ActiveCN103308499AAvoid wastingImprove the ability to capture lightFluorescence/phosphorescenceTest performanceSpectrograph
The invention discloses a device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder and relates to fluorescent powder. The invention provides a device and method for testing performance of blue LED excitation fluorescent powder based on an integrating sphere. The testing device is provided with a fixing base, an integrating sphere, a light outlet barrel, a blue LED light source, a TEC temperature control clamp, a constant current source, a cosine collector, a spectrograph, a computer, a baffle and a standard white board. An LED with the advantages of adjustable spectrum parameters and stable illumination serves as the excitation light source, the light rays reflected by the fluorescent powder are completely collected through the characteristic that the integrating sphere device is closed, a set of fluorescent powder performance measurement system with high applicability is provided, and important luminous performance indexes, such a luminous efficacy, external quantum efficiency and light conversion efficiency, of the fluorescent powder under the actual working conditions can be conveniently and accurately measured and analyzed; meanwhile, the LED excitation light source can be flexibly replaced in the system so as to meet the requirements of different fluorescent powder on different excitation light sources, and the system has good extension performance.
Owner:XIAMEN UNIV
Organic Electronic Material, Ink Composition Containing Same, and Organic Thin Film, Organic Electronic Element, Organic Electroluminescent Element, Lighting Device, and Display Device Formed Therewith
InactiveUS20120074360A1Well formedLight emission efficiencyConductive materialSolid-state devicesOligomerDisplay device
Provided are: an organic electronic material which can be easily multilayered and that can be used in substrates, such as resin, that cannot be processed at high temperatures; an ink composition containing the same; an organic thin film formed using said organic electronic material or said ink composition; and an organic electronic element and an organic EL element that are formed using said organic thin film and that have a superior luminous efficacy and emission lifespan than conventional elements. Specifically, provided are: an organic electronic material that is characterized by containing an oligomer or a polymer having a structure that branches into three or more directions and has at least one polymerizable substituent; an ink composition containing said organic electronic material; and an organic thin film prepared using the aforementioned organic electronic material. Further, provided are an organic electronic element and an organic electroluminescent element containing said organic thin film.
Owner:HITACHI CHEM CO LTD
Composite fluorescent transparent ceramic used for white-light LED and adopting garnet structure
InactiveCN103964834AHigh light efficiencyHigh color rendering indexQuantum efficiencyChemical composition
The invention relates to the field of transparent fluorescent ceramics of LEDs, and discloses a composite fluorescent transparent ceramic used for a white-light LED and adopting a garnet structure. The composite fluorescent transparent ceramic is prepared through tape casting and vacuum sintering; and the chemical composition of the transparent ceramic comprises N transparent ceramic phosphors or non-phosphor components with different LED light emitting properties, wherein N is larger than or equal to 2. The prepared composite fluorescent transparent ceramic is simple in structure, the packaging process is simplified, the white-light LED has high luminous efficacy, high color rendering index, high quantum efficiency and excellent temperature quenching performance, and the composite fluorescent transparent ceramic can be used for packaging various white-light LED devices.
Owner:张红卫
White-light LED (Light Emitting Diode) light source
ActiveCN102760820AOvercoming secondary absorptionImprove light extraction efficiencySemiconductor devicesColor rendering indexRare earth
The invention relates to a white-light LED (Light Emitting Diode) light source. The white-light LED light source comprises a bowl cup, a blue-light LED chip arranged at the bottom of the bowl cup, yellow-green fluorescent powder and red fluorescent powder, wherein the yellow-green fluorescent powder and red fluorescent powder are arranged above the blue-light LED chip, and the yellow-green fluorescent powder is arranged above the red fluorescent powder. The white-light LED light source selects the yellow-green fluorescent powder with high luminous efficacy and a rare earth aluminate matrix, yellow-green silicate fluorescent powder and silica-based nitride red powder which are combined and matched with the blue-light LED chip, and through the reasonable design of the spatial layout of fluorescent powder with different systems inside an LED, the secondary absorption of yellow-green light by the nitride red fluorescent powder can be effectively overcome, and the relatively high emergent light efficiency also can be obtained simultaneously when a color rendering index is obviously promoted. A light-emitting system provided by the invention can realize white light with high luminous efficacy and a high color rendering index by adjusting the proportioning of fluorescent powder with different emission spectrums so as to meet the technical requirements of general lighting.
Owner:江西省兆驰光电有限公司
Method for manufacturing high-luminous-efficacy focusing solar Fresnel lens
ActiveCN102230980AExtended service lifeLow machining accuracy requirementsLensFresnel lensOptical axis
The invention relates to a method for manufacturing a high-luminous-efficacy focusing solar Fresnel lens. The method comprises the following five steps of: 1, improving a ripple surface, wherein a vertical surface (15) of each ripple is changed into an inner inclined surface (9); an inclination angle of an intersection between the inner inclined surface (9) and a bottom surface (2) is reduced along with the increasing of a vertical distance between the intersection and a central optical axis (7); the degree di of each inclination angle can be calculated by an inverse trigonometric function; and a ripple bottom is changed into a narrow flat bottom; 2, selecting flat-panel quartz glass and silica gel as materials; 3, changing a single-layer mirror body into a glass and silica gel double-layer compound mirror body; 4, moulding; and 5, treating the surface of glass, performing rubber injection and compound forming, trimming the edge and inspecting so as to manufacture the improved Fresnellens. The lens manufactured by the method has high luminous efficacy, a low light precision requirement, high light transmission performance and anti-aging performance, low manufacturing cost and long service life. The compound lens has high material performance complementarity; furthermore, the processing difficulty of the die and the mirror body is reduced; and the service life of the die is prolonged.
Owner:HANGZHOU XINENG NEW MATERIAL CO LTD
LED epitaxial layer growth method for improving luminous efficiency and LED epitaxial layer
ActiveCN104009136AIncrease concentrationImprove mobilitySemiconductor devicesHigh current densityHole injection layer
The invention provides an LED epitaxial layer growth method for improving luminous efficiency and an LED epitaxial layer. A P type hole injection layer comprises a first double-layer unit and a second double-layer unit. The first double-layer unit comprises a first AlGaN layer and a first GaN layer, the thickness of the first AlGaN layer and the first GaN layer ranges from 2 nm to 5 nm, the ratio of the first AlGaN layer to the first GaN layer in one period ranges from 1:1 to 3:1, and the period ranges from 5 to 10. The second double-layer unit comprises a second AlGaN layer and a second GaN layer, the thickness of the second AlGaN layer and the second GaN layer ranges from 2 nm to 5 nm, the ratio of the second AlGaN layer to the second GaN layer in one period ranges from 1:1 to 3:1, and the period ranges from 5 to 10. The P type hole injection layer is formed by a P type AlGaN / GaN superlattice layer which grows at a low temperature and a P type AlGaN / GaN superlattice layer which grows at a high temperature, the Droop effect of an LED chip under the high current density condition is effectively reduced, injection efficiency of charge curriers is improved, and luminous efficiency of devices is improved.
Owner:XIANGNENG HUALEI OPTOELECTRONICS
Lighting device with integration sheet
A light device with integration sheet is disclosed, which comprises: a light source; and at least a sheet, each being disposed at the light emitting end of the light source and comprising a plurality of light diffusion zones; wherein each light diffusion zone has a plural arrays of microstructures arranged on the surface thereof, and each array of microstructures is capable of changing the diopter of the corresponding light diffusion zone. By controlling the distribution of the plural arrays of microstructures, the Gaussian distribution of the light source can be improved while collimating the scattered light beams to the intended illuminating area of the lighting device and diffusing the light beams emitting from the center of the light source to the same so that not only the luminous efficacy of the lighting device is enhanced, but also the uniformity of the illuminance of the lighting device is improved.
Owner:ACER INC
Light emitting apparatus
InactiveUS20140160728A1Good colorLight emission efficiencyLight source combinationsSolid-state devicesFluorescenceUltraviolet lights
The present invention relates to a light emitting apparatus. According to one aspect of the present invention, the light emitting device comprises: a plurality of light emitting devices including a blue light emitting device emitting blue light and a UV light emitting device emitting ultraviolet light; and a wavelength conversion part arranged in the path of the light emitted from the plurality of light emitting devices, and provided with fluorescent substances to convert the wavelengths of the light emitted from the plurality of light emitting devices, wherein a fluorescent substance excited by and mixed with the blue light to obtain white light is arranged on a first area corresponding to the blue light emitting device, and at least a blue fluorescent substance is arranged on a second area corresponding to the UV light emitting device. When the light emitting apparatus according to the present invention is used, a combination of the light sources and the fluorescent substances within one module may be appropriately adopted to obtain both improved luminous efficacy and white light having a high color rendering index.
Owner:SAMSUNG ELECTRONICS CO LTD
Nitride semiconductor chip, method of fabrication thereof, and semiconductor device
InactiveCN101944480AReduce the driving voltageImprove yieldLaser detailsSemiconductor/solid-state device manufacturingSemiconductor chipNitride semiconductors
A nitride semiconductor chip is provided that offers enhanced luminous efficacy and an increased yield as a result of an improved EL emission pattern and improved surface morphology (flatness). This nitride semiconductor laser chip (nitride semiconductor chip) includes a GaN substrate having a principal growth plane and individual nitride semiconductor layers formed on the principal growth plane of the GaN substrate. The principal growth plane is a plane having an off angle in the a-axis direction relative to the m plane, and the individual nitride semiconductor layers include a lower clad layer of AlGaN. This lower clad layer is formed in contact with the principal growth plane of the GaN substrate.
Owner:SHARP KK
High efficiency solid state directional lighting including luminescent nanocrystal particles
InactiveUS8508126B1Reduce heat transferPoint-like light sourceDischarge tube main electrodesBeam divergencePhysics
A solid state directional lighting device includes a semiconductor light source emitting a primary short wavelength light and a light collimation component disposed in light-reflecting relation to the light source to generate a collimated light with beam divergence angle less than forty degrees (40°). A luminescent nanocrystal conversion layer is disposed in the path of the collimated light and includes a luminescent nanocrystal conversion layer including luminescent nanocrystal particles with nano-particles sizes less than fifteen nanometers (15 nm). The luminescent nanocrystal particles absorb at least a portion of the collimated short wavelength light and convert the absorbed light into at least one long wavelength spectral light. A mixture of leakage primary short wavelength light and long wavelength light converted by the luminescent nano-particles produces a directional white light with luminous efficacy of at least one hundred lumens per Watt (100 lm / W). Light scattering is reduced due to the nano-particle size.
Owner:LEDNOVATION
Graph masking method for improving luminous efficiency of GaN base LED (light-emitting diode)
InactiveCN102034907AImprove light extraction efficiencyInhibit deteriorationSemiconductor devicesThin layerLead structure
The invention discloses a graph masking method and a method for improving the luminous efficiency of a GaN base LED (light-emitting diode). The method comprises the steps: selectively etching a GaN thin layer by a mask with regularly-distributed patterns to form a plurality of regularly-distributed grooves; and making the grooves in a GaN epitaxial layer to form a hollow cavity by controlling the lateral growing speed during the epitaxial growth of the GaN. As an LED structure is grown on a GaN template with the regularly-distributed masking type hollow cavities, the method effectively improves the luminous efficiency.
Owner:YUTI LIGHTING SHANGHAI
Coil antenna/protection for ceramic metal halide lamps
InactiveUS20050042967A1Good color consistencyImprove stabilityTube/lamp screens manufactureElectroluminescent light sourcesColor rendering indexLumen maintenance
The invention relates to a high-pressure discharge lamp of the ceramic metal halide type of the Philips MasterColor series having a molybdenum coil wrapped around the discharge vessel and at least a portion of the electrode feed through means, and having power ranges of about 150 W to about 1000 W. Such lamps are provided with a discharge vessel which encloses a discharge space. The discharge vessel has a ceramic wall and is closed by a ceramic plug. An electrode which is located inside the discharge space is connected to an electric conductor by way of a leadthrough element. The leadthrough element projects through the ceramic plug with a close fit and is connected thereto in a gastight manner by way of a sealing ceramic. The leadthrough element has a first part which is formed by a cermet at the area of the gastight connection. In addition, the lamps display one or more and most preferably all of the following properties: a CCT (correlated color temperature) of about 3800 to about 4500K, a CRI (color rendering index) of about 70 to about 95, a MPCD (mean perceptible color difference) of about +10, and a luminous efficacy up to about 85-95 lumens / watt, a lumen maintenance of >80%, color temperature shift <200K from 100 to 8000, and lifetime of about 10,000 hours to about 25,000 hours. The invention also relates to design spaces for the design and construction of high power lamps and methods for construction of such lamps using the design spaces.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
T-chain unit phenyl-containing MTQ silicon resin and preparation method thereof
ActiveCN102898650AHigh refractive indexHigh phenyl contentOther chemical processesRefractive indexMechanical property
The invention relates to the field of organic polymer chemistry and discloses a T-chain unit phenyl-containing MTQ silicon resin and a preparation method thereof. The T-chain unit phenyl-containing MTQ silicon resin solves the problem that a MTQ silicon resin as a silicon rubber reinforcement filler leads to a large difference between refractive indexes of a packaging material and a LED chip because of a small refractive index of the MTQ silicon resin and thus optical efficiency of a semiconductor lighting device is reduced. The preparation method comprises that tetraethoxysilane as a Q chain unit source, phenyltrimethoxysilane as a T chain unit source, hexamethyldisiloxane as an M chain unit source and 1,3-divinyltetramethyldisiloxane as an M chain unit source undergo a co-hydrolytic condensation reaction in the presence of hydrochloric acid as a catalyst to produce the T-chain unit phenyl-containing MTQ silicon resin. The T-chain unit phenyl-containing MTQ silicon resin can improve luminous efficacy of a semiconductor lighting device and improve mechanical properties of a packaging material. The preparation method allows mild reaction conditions, has simple processes and is suitable for large-scale industrial production.
Owner:HANGZHOU NORMAL UNIVERSITY +1
Drive method and system for LED display panel
ActiveUS20160118026A1Improve luminous efficiencyReduced luminous efficiencyElectrical apparatusElectroluminescent light sourcesLED displayExternal storage
A drive method and system for an LED display panel. The method comprises: converting an HDMI / DVI video signal into an RGB signal; dividing the RGB signal into N independent code streams and re-ranking same; and periodically switching a direct current provided to an LED display module (30) at least between a first current I1 and a second current I2. The system comprises an FPGA controller (20), and a video signal decoder (10), a first external memory (41), a second external memory (42) and an LED display module (30) which are respectively connected to the FPGA controller (20). The FPGA controller (20) comprises N LED drive modules (231-23N) which are connected in parallel. The drive method and system can enhance the luminous efficacy of an LED, and can also conduct linear dimming on the LED.
Owner:THE HONG KONG POLYTECHNIC UNIV
Organic electroluminescent element and novel alcohol-soluble phosphorescent material
ActiveCN102668156AIncreased durabilityImprove luminous efficiencyIndium organic compoundsElectroluminescent light sourcesElectron injectionSolvent
Owner:DAIDEN CO LTD
Diffusion plate of multilayered diffusion particle layer
InactiveCN102147488AStrong anti-ultraviolet absorption abilityHigh light transmittanceDiffusing elementsSynthetic resin layered productsDiffusionMolecular physics
A diffusion plate of a multilayered diffusion particle layer belongs to the field of diffusion plates. The diffusion plate comprises a diffusion particle layer, a middle layer made of a transparent resin substrate, and a diffusion particle layer, namely the diffusion plate is in a sandwich structure. The basal bodies of two diffusion particle layers are made of high molecular light transparent materials; and diffusion particles and an ultraviolet absorber are dispersed in both of the two diffusion particle layers. At least one outer surface of the diffusion plate disclosed by the invention has a microstructure, so as to improve the luminous efficacy and the diffusion efficacy. Simultaneously, in consideration of the wider application range of the diffusion plate, the middle layer of the transparent resin substrate is manufactured into various curved surface shapes.
Owner:BEIJING UNIV OF CHEM TECH
Nitride semiconductor chip, method of fabrication thereof, and semiconductor device
InactiveUS20110001126A1Improve luminous efficiencyImproved EL emission patternSemiconductor/solid-state device manufacturingSemiconductor devicesPower semiconductor deviceNitride semiconductors
A nitride semiconductor chip is provided that offers enhanced luminous efficacy and an increased yield as a result of an improved EL emission pattern and improved surface morphology (flatness). This nitride semiconductor laser chip (nitride semiconductor chip) includes a GaN substrate having a principal growth plane and individual nitride semiconductor layers formed on the principal growth plane of the GaN substrate. The principal growth plane is a plane having an off angle in the a-axis direction relative to the m plane, and the individual nitride semiconductor layers include a lower clad layer of AlGaN. This lower clad layer is formed in contact with the principal growth plane of the GaN substrate.
Owner:SHARP KK
Wall washing lamp lens, light-emitting module provided with wall washing lamp lens and wall washing lamp
ActiveCN105546432AReduce lossesHigh light efficiencyMechanical apparatusOutdoor lightingStray lightLuminous efficacy
The invention discloses a wall washing lamp lens which comprises a lens body and a lens base supporting the lens body. The lens body comprises an inner surface receiving light emitted from a light source and an outer surface emitting light. The outer surface comprises a first curved face, a second curved face and a third curved face, wherein the first curved face is used for totally reflecting light to a wall washing face, the second curved face is used for refracting the light to the wall washing face, and the third curved face is used for totally reflecting the light to the wall washing face. The first curved face and the second curved face are both formed in the mode that a continuous curve rotates around the Y-axis by 180 degrees. The third curved face is formed in the mode that a continuous curve rotates around the Y-axis by -180 degrees. The invention provides the wall washing lamp lens, a light-emitting module provided with the wall washing lamp lens and a wall washing lamp. Due to combined action of the three curved faces, stray light can be reduced, and luminous efficacy is improved. The whole lens does not need to deflect to achieve polarization and uniform distribution of the illumination of the wall washing face, and the situation that the portion, near the lamp, of the wall washing face and the portion, far away from the lamp, of the wall washing face sharply attenuate is avoided.
Owner:浙江光锥科技有限公司
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