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364results about How to "Reduced luminous efficiency" patented technology
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Led and led lamp
InactiveUS20050068776A1Great disadvantageIncrease temperatureMechanical apparatusLight source combinationsLight reflectionEngineering
This invention relates to a light emitting diode (LED) and a LED lamp consisted of LEDs. The LED comprises at least one LED chip. The LED is mounted on a high heat conductivity base and is connected to an applied power supply through a circuit board. The LED chip also has a transparent medium layer on it. The base top surface acts as a light reflective surface, or a light reflective surface is provided around the base, the LED comprises a screw extended downwards from the base bottom or a screw hole in the base bottom to connect the LED to a heat sink mechanically. The LED is electrically connected to a driving circuit through its outgoing wires. The driving circuit is in turn electrically connected to an electrical connector through its housing. A LED lamp can be fabricated after the LED is enclosed in a transparent bulb housing. The LED has high efficiency, high power and long lifetime and can be used to fabricate LED traffic lamps, LED plane light sources, etc.
Owner:LOU MANE
LED and LED lamp
InactiveUS20060198147A1Great disadvantageIncrease temperatureMechanical apparatusLight source combinationsLight reflectionEngineering
Owner:LOU MANE
Light-emitting diode and method for manufacturing same, integrated light-emitting diode and method for manufacturing same, method for growing a nitride-based iii-v group compound semiconductor, substrate for growing a nitride-based iii-v group compound semiconductor, light source cell unit, light-emitting diode backlight, light-emitting diode illuminating device, light-emitting diode display and electronic instrument, electronic device and method for manufacturing same
InactiveUS20070085093A1Low luminous efficiencyLight extraction efficiencyPolycrystalline material growthSolid-state devicesDisplay deviceEngineering
A method for manufacturing a light-emitting diode, which includes the steps of: providing a substrate having a plurality of protruded portions on one main surface thereof wherein the protruded portion is made of a material different in type from that of the substrate and growing a first nitride-based III-V Group compound semiconductor layer on each recess portion of the substrate through a state of making a triangle in section wherein a bottom surface of the recess portion becomes a base of the triangle; laterally growing a second nitride-based III-V Group compound semiconductor layer on the substrate from the first nitride-based III-V Group compound semiconductor layer; and successively growing, on the second nitride-based III-V Group compound semiconductor layer, a third nitride-based III-V Group compound semiconductor layer of a first conduction type, an active layer, and a fourth nitride-based III-V compound semiconductor layer of a second conduction type.
Owner:SONY CORP
Organometallic complex, and light-emitting element, light-emitting device and electronic device including the organometallic compex
ActiveUS20080160345A1Improve emission efficiencySolve low luminous efficiencyGroup 5/15 element organic compoundsSolid-state devicesArylHalogen
An object is to provide an organometallic complex that can emit red light. Another object is to provide an organometallic complex having high emission efficiency. Still another object is to provide an organometallic complex that can emit red light with high luminous efficiency. The present invention provides an organometallic complex having a structure represented by the following general formula (G1′).In the formula, Ar represents an aryl group having 6 to 25 carbon atoms; R1 represents any one of hydrogen, an alkyl group having 1 to 4 carbon atoms, and an alkoxy group having 1 to 4 carbon atoms; R2 to R8 each represent any one of hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and a halogen group; at least one of pairs R3 and R4, R4 and R5, and R5 and R6 may be bound to each other to form a ring; and M represents a central metal of Group 9 elements and Group 10 elements.
Owner:SEMICON ENERGY LAB CO LTD
Light emitting device using LED
InactiveUS6930332B2Prevented in reflecting abilityIncrease heat radiationSolid-state devicesSemiconductor devicesEpoxyThermal radiation
A light emitting device that can provide enhanced heat radiation as well as allowing light from a light emitting diode (LED) chip to be efficiently extracted out of the device. This light emitting device includes a metal plate (11) that is made of aluminum. The metal plate (11) has a projection (11a) projecting forward. The projection (11a) has a front side provided with a housing recess (11b). An LED chip (1) is mounted on the bottom of the housing recess (11b) so that it is thermally coupled to the metal plate (11), thus allowing heat to be radiated efficiently. A printed circuit board (12), having a grass epoxy substrate to be joined to the front surface of the metal plate (11), is provided with an insertion hole (13) into which the projection (11a) is inserted. The LED chip (1) and a bonding wire (W) are encapsulated in a transparent resin seal portion (50). The side wall of the housing recess (11b) that is part of the metal plate (11) functions as a reflector for reflecting forward light emitted from the LED chip (1). Thus, light from the LED chip (1) can be extracted efficiently.
Owner:SATCO PRODS
Method for manufacturing light-emitting diode, light-emitting diode, lightsource cell unit, light-emitting diode backlight, light-emitting diode illuminating device, light-emitting diode display, and electronic apparatus
InactiveUS20080121903A1Well formedImprove processing accuracySolid-state devicesSemiconductor/solid-state device manufacturingEngineeringRefractive index
A light-emitting diode which has a significantly high luminous efficiency and which can be manufactured at a reasonable cost by one epitaxial growth and a manufacturing method thereof are provided. The above method includes: preparing a substrate provided with convex portions on one major surface, the convex portions being formed from a dielectric substance which is different from the substrate and which has a refractive index of 1.7 to 2.2; growing a first nitride-based III-V compound semiconductor layer in a concave portion on the substrate; growing a second nitride-based III-V compound semiconductor layer on the substrate from the first nitride-based III-V compound semiconductor layer in a lateral direction; and growing, on the second nitride-based III-V compound semiconductor layer, a first conductive type third nitride-based III-V compound semiconductor layer, an active layer, and a second conductive type fourth nitride-based III-V compound semiconductor layer.
Owner:SONY CORP
Backlight device and liquid crystal display apparatus
ActiveUS20090135331A1Efficient heat generationEffective radiationIlluminated signsNon-linear opticsLiquid-crystal displayLight emitting device
A backlight device that illuminates a transmissive liquid crystal panel is disclosed. The device includes: a plurality of light source substrates on which a plurality of light emitting devices irradiating illumination light are mounted; a bottom chassis having one surface to which the plurality of light source substrates are attached; a reflector having openings corresponding to the light emitting devices and through which the light emitting devices are exposed to one surface side, and reflecting the illumination light irradiated from the light emitting devices; a diffuser facing the one surface side of the reflector through a predetermined facing interval and internally diffusing the illumination light incident from the reflector; and an optical function sheet laminate combined with the diffuser on one surface side thereof, containing a stack of a plurality of optical function sheets and guiding the illumination light to the transmissive liquid crystal panel.
Owner:SATURN LICENSING LLC
Automotive discharge bulb and automotive headlamp
InactiveUS20050007020A1Wasteful consumption can be reducedReduce the ratioDischarge tube luminescnet screensPoint-like light sourceNoble gasLuminous flux
An automotive discharge bulb having a light emitting tube includes a ceramic tube with paired electrodes oppositely placed, and contains a light emitting material and starting rare gas. A transversal section of the ceramic tube is longitudinally elongated. Because the capacity of an enclosed space of the ceramic tube is small, after discharging begins, the enclosed space temperature increases. Consequently, the ceramic tube has a good luminous flux rising characteristic. Because of the small surface area of the ceramic tube, the load imposed on the wall surface increases. Consequently, the ceramic tube has good luminous efficiency. In the ceramic tube having a longitudinally elongated transversal section, an arc generated into an upwardly convex shape and the tube wall do not make contact. Thermal shock resistance required of the ceramic tube is alleviated, durability is enhanced, and the ceramic tube is made of a ceramic material hitherto unusable.
Owner:KOITO MFG CO LTD
Image capturing device
InactiveUS20050030416A1Eliminate wasteSuppress feverTelevision system detailsPhotometryLight-emitting diodeImage capture
An image capturing device employing as illumination source(s) (flash apparatus(es)) a plurality of light emitting diodes emitting light of different colors; wherein such light emitting diodes are respectively made to emit light in pulsed fashion in turn by emitted color during exposure time(s). Furthermore, during exposure time(s), such light emitting diodes may be made to sequentially emit light in pulsed fashion in turn by emitted color, and / or such light emitting diodes may be made to sequentially emit light in pulsed fashion in turn by emitted color over multiple iterations.
Owner:SHARP KK
Vehicular headlamp
InactiveUS20100253223A1Simple internal lamp chamber structureReduced luminous efficiencyVehicle headlampsVehicle interior lightingEffect lightEngineering
A vehicular headlamp, wherein a light source unit for light distribution formation is accommodated inside a lamp chamber defined by a lamp body and a front cover, includes a metal heat transfer member that serves as a light source unit structural member; a light-emitting element that serves as a light source; a fan for cooling the light-emitting element provided inside the lamp chamber; and a lighting circuit that controls lighting of the light-emitting element. The light-emitting element, the fan, and the lighting circuit are each attached to the metal heat transfer member.
Owner:KOITO MFG CO LTD
Semiconductor light emitting device
InactiveUS20080093593A1Reduced luminous efficiencyMinimizing non-uniformityNanoopticsSemiconductor devicesQuantum wellContact layer
A semiconductor light emitting device may include an n-type contact layer on a substrate. An active layer may be on the n-type contact layer and / or include two or more quantum well layers and two or more barrier layers. A p-type contact layer may be on the active layer. Energy band gaps of the quantum well layers may be larger as the quantum well layers are closer to the n-type contact layer from the p-type contact layer, thicknesses of the quantum well layers may be smaller as the quantum well layers are closer to the n-type contact layer from the p-type contact layer, and / or energy band gaps of the barrier layers may be larger as the barrier layers are closer to the n-type contact layer from the p-type contact layer.
Owner:SAMSUNG ELECTRONICS CO LTD
Organic electroluminescent device
InactiveUS20100314644A1Reduced luminous efficiencyImprove luminous efficiencySolid-state devicesSemiconductor/solid-state device manufacturingDopantElectronic transmission
An organic electroluminescence device including opposite anode and cathode, and a hole-transporting region, an emitting layer and an electron-transporting region in sequential order from the anode between the anode and the cathode, wherein the emitting layer is formed of a red emitting layer, a green emitting layer, and blue emitting layer; the blue emitting layer contains a host BH and a fluorescent dopant FBD; the triplet energy ETfbd of the fluorescent dopant FBD is larger than the triplet energy ETbh of the host BH; the green emitting layer contains a host GH and a phosphorescent dopant PGD; a common electron-transporting layer is provided adjacent to the red emitting layer, the green emitting layer and the blue emitting layer within the electron-transporting region; the triplet energy ETel of a material constituting the electron-transporting layer is larger than ETbh; and the difference between the affinity of the host GH and the affinity of the material constituting the electron-transporting layer is 0.4 eV or less.
Owner:IDEMITSU KOSAN CO LTD
Wavelength conversion member and method for manufacturing the same, and light-emitting device, illuminating device, and headlight
InactiveUS20140003074A1Low luminous efficiencyImprove luminous efficiencyConductive materialSolid-state devicesFluorescenceLight emitting device
A headlamp (1) includes a laser diode (2) for emitting a laser beam and a light-emitting section (5), which contains a fluorescent substance for emitting fluorescence upon receiving the laser beam emitted from the laser diode (2) and diffusing particles (15) for diffusing the laser beam.
Owner:SHARP KK
Organic electro-luminescence element and the manufacturing method thereof
InactiveUS6881501B2Reduce power consumptionReduce in quantityDischarge tube luminescnet screensElectroluminescent light sourcesOrganic electroluminescenceCathode ray
The invention increases the outgoing efficiency of light generated in an organic luminous layer of an organic electroluminescence element without decreasing the numerical aperture. A light-transmissive anode electrode layer, an organic luminous layer, and a light-reflective cathode layer are provided on the entire surface of one pixel region. On the anode layer, the organic luminous layer, and the cathode layer, slopes are installed protruding from the anode layer side to the cathode layer side. By this, light generated in the organic luminous layer, and irradiated in parallel to a cumulate surface of a cumulate body, is reflected by the slope on the boundary between the organic luminous layer and the cathode layer and exits toward the anode layer side.
Owner:BOE TECH GRP CO LTD
Photonic crystal type color filter and reflective liquid crystal display device having the same
InactiveUS20090284696A1Wavelength selectivity is not optimumLow light transmittanceOptical filtersNanoopticsPhotonic crystalGrating
Provided are a photonic crystal type color filter and a reflective liquid crystal display (“LCD”) device having the same. The photonic crystal type color filter includes a substrate, and a photonic crystal disposed on the substrate and having a two-dimensional (2D) grating structure.
Owner:SAMSUNG DISPLAY CO LTD
LED device and illuminating apparatus
InactiveUS20100102344A1Reduced luminous efficiencyPrevent degradationSolid-state devicesSemiconductor devicesPhosphorEngineering
White LED device 20 includes LED chip 13 mounted on substrate 1 made of metal, sealing resin 11 that seals LED chip 13; and glass member 12 formed on sealing resin 11. Glass member 12 contains phosphor 22 and thermal conductivity of sealing resin 11 is lower than that of glass member 12.
Owner:NEC LIGHTING
LED driving apparatus and method of controlling luminous power
ActiveUS20060082538A1Reduced luminous efficiencyLarge levelElectroluminescent light sourcesCathode-ray tube indicatorsDriving currentEngineering
A light emitting diode (LED) driving apparatus includes a drive section for driving an LED to emit light, and a control section that controls a driving current supplied from the drive section to the LED. The control section implements luminous power control by controlling an ON / OFF ratio of the driving current if a target value of luminous power of the LED is smaller than a predetermined value. The control section implements luminous power control by controlling a level of the driving current if the target value is equal to or larger than the predetermined value.
Owner:SAMSUNG ELECTRONICS CO LTD
Liquid Crystal Display Device
InactiveUS20090066877A1Deterioration of light emissionExtended service lifeOptical light guidesNon-linear opticsHeat sinkLiquid-crystal display
The present invention relate to a liquid crystal display device using a light emitting diode (LED) module as a light source for backlight. Storing portions (21a-21e) are provided at positions facing a light emitting diode modules (25) on a light guide plate (21) constituting the backlight, and the light emitting diode modules (25) are inserted into the storing portions (21a-21e). Furthermore, under a status where an insulating substrate (26) mounted with the light emitting diode modules (25) is held by a holding plate (28), the holding plate (28) is removably attached to a heat sink substrate (27). The backlight has a structure wherein the light emitting diode module (25) can be replaced. Furthermore, since heat generated at the light emitting diode module (25) can be efficiently dissipated to the heat sink substrate (27), temperature increase of the light emitting diode module (25) is suppressed, and lifetime can be lengthened, and deterioration of luminous efficiency can be prevented.
Owner:KYOCERA CORP
Liquid crystal display device
InactiveUS7903198B2Extended service lifeAvoid temperature riseOptical light guidesNon-linear opticsLiquid-crystal displayLight guide
The present invention relate to a liquid crystal display device using a light emitting diode (LED) module as a light source for backlight. Storing portions (21a-21e) are provided at positions facing a light emitting diode modules (25) on a light guide plate (21) constituting the backlight, and the light emitting diode modules (25) are inserted into the storing portions (21a-21e). Furthermore, under a status where an insulating substrate (26) mounted with the light emitting diode modules (25) is held by a holding plate (28), the holding plate (28) is removably attached to a heat sink substrate (27). The backlight has a structure wherein the light emitting diode module (25) can be replaced. Furthermore, since heat generated at the light emitting diode module (25) can be efficiently dissipated to the heat sink substrate (27), temperature increase of the light emitting diode module (25) is suppressed, and lifetime can be lengthened, and deterioration of luminous efficiency can be prevented.
Owner:KYOCERA CORP
White semiconductor light emitting device
InactiveUS20120319565A1Increased durabilityIncrease resistanceDischarge tube luminescnet screensElectroluminescent light sourcesColor rendering indexLuminous flux
The invention aims at providing controllable parameters that are correlated with special color rendering index R9, and at providing a white light-emitting semiconductor device having a high R9 value obtained through optimization of such parameters.The white light-emitting semiconductor device is provided with a phosphor as a light-emitting material and with a light-emitting semiconductor element as an excitation source of the phosphor. The phosphor includes at least a green phosphor and a wide-band red phosphor. In the white light-emitting semiconductor device, an intensity at wavelength 640 nm of an emission spectrum which has been normalized with respect to luminous flux is 100-110% of the intensity at wavelength 640 nm of a spectrum of standard light for color rendering evaluation which has been normalized with respect to luminous flux.
Owner:CMC MAGNETICS CORPORATION
Lighting fixture
InactiveUS6929382B2Reduced luminous efficiencyMechanical apparatusLight source combinationsEffect lightEngineering
A lighting fixture, which is arranged to receive two or more elongated light sources positioned one after another in the longitudinal direction of the light sources, the lighting fixture comprising one or more connecting devices, which are arranged to supply energy to the light sources in order to burn them and positioned in a region between the successive light sources in the lighting fixture, and a globe part and a background part, which are arranged to be connected to one another and to substantially surround the light sources and the connecting devices. The lighting fixture further comprises one or more cover plates, which are arranged at the connecting devices between the globe part and the background part of the lighting fixture to substantially cover the connecting devices, and one or more second light sources, which are arranged in connection with the cover plate to provide lighting from the region between the successive elongated light sources.
Owner:TEKNOWARE
AMOLED display panel brightness compensation method and device
ActiveCN107274834ASimple structureEasy to operateStatic indicating devicesUltrasound attenuationDisplay device
The invention provides an AMOLED display panel brightness compensation method and device. The method is concise in step. The device is simple in structure and easy to operate. The aging test is performed on a display panel in advance and the attenuation law of the sub-pixel brightness along with grayscale and time is obtained, the compensation data are calculated and a dynamic compensation table is generated; and the inputted original grayscale is corrected in a correction module according to the dynamic compensation table, the sub-pixel brightness is compensated and the display panel is enabled to be normal in display. The beneficial effects are that aging of the TFT in the displayer and attenuation of the OLED luminous efficiency can be compensated without arranging the circuit or the sensor for detecting the luminous state in the display panel.
Owner:SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
Nitride Semiconductor Light Emitting Device
InactiveUS20090166668A1Large band gap energyImprove efficiencySolid-state devicesNanoopticsQuantum efficiencyRecombination radiation
There is provided a nitride semiconductor light emitting device having high internal quantum efficiency by accelerating recombination radiation while employing a multiple quantum well structure in which each of well layers has a relatively large thickness. The nitride semiconductor light emitting device is provided with a nitride semiconductor lamination portion (6) provided on a substrate (1). The nitride semiconductor lamination portion (6) includes at least an active layer (4) in which a light emitting portion is formed. And the active layer is constituted with a multiple quantum well structure formed by laminating well layers (7) made of InxGa1-xN (0<x≦1), and barrier layers (8) made of AlyInzGa1-y-zN (0≦y<1, 0≦z<1, 0≦y+z<1, z<x) alternately. In addition, one of the well layers is divided at least into a first well layer (7a) and a second well layer (7b) by a thin film barrier layer (7c) made of AlvInwGa1-v-wN (0≦v<1, 0≦w<1, 0≦v+w<1, w<x), and the thin film barrier layer is formed so as to have a thickness of one atomic layer or more and 20 Angstroms or less.
Owner:ROHM CO LTD
Metal plate, method of manufacturing metal plate, and method of manufacturing mask by use of metal plate
ActiveUS20160208392A1Reduced luminous efficiencySolve high precisionLayered productsExtrusion containersMetalMaterials science
The object of the present invention is to provide a metal plate having an excellent transportability. A maximum value of a steepness degree at a central area in a width direction of the metal plate is not more than 0.4%. In addition, the maximum value of the steepness degree at the central area is not more than a steepness degree at one end side area, and is not more than a steepness degree at the other end side area. Further, a difference between the maximum value of the steepness degree at the one end side area and the maximum value of the steepness degree at the other end side area is not more than 0.4%.
Owner:DAI NIPPON PRINTING CO LTD
High-efficient white-light organic electroluminescence device
ActiveCN103187537AFlexible control of luminous intensityGuaranteed luminous efficiencySolid-state devicesSemiconductor/solid-state device manufacturingHole injection layerHole transport layer
The invention relates to a high-efficient white-light organic electroluminescence device which comprises a substrate, an anode layer, a luminous unit layer and a cathode layer; the luminous unit layer comprises a hole injection layer which is formed on the anode layer, a hole transport layer is formed on the hole injection layer, the cathode layer is formed on an electron transport layer, a plurality of luminous layers are arranged between the hole transport layer and the electron transport layer, each luminous layer comprises a fluorescence luminous layer and a phosphorescence luminous layer, and a barrier layer consisting of an electron transport material and a hole transport material of the same parent nucleus is arranged between the fluorescence luminous layer and the phosphorescence luminous layer; and a main body material of the phosphorescence luminous layer which is adjacent to the barrier layer comprises an electron transport material and a hoe transport material of the same parent nucleus. The luminous device can effectively allocate the electron transport efficiency and the hole transport efficiency and has the advantage of high luminous efficiency.
Owner:GUAN YEOLIGHT TECH CO LTD +1
Anisotropic conductive adhesive and method for manufacturing same, light-emitting device and method for manufacturing same
InactiveUS20150034989A1Inhibition of adsorptionEfficiently take out lightConductive materialVacuum evaporation coatingAnisotropic conductive adhesiveMetal alloy
an anisotropic conductive adhesive which uses conductive particles where a silver-based metal is used as a conductive layer, having high light reflectance and excellent migration resistance is provided. The anisotropic conductive adhesive includes light reflective conductive particles in an insulating adhesive resin. The light reflective conductive particle includes a light reflective metal layer made of a metal alloy including silver, gold and hafnium formed on the surface of a resin particle as a core by sputtering method. The light reflective metal layer is preferably formed having a composition ratio of a silver of at least 50% by weight to at most 80% by weight: a gold of at least 10% by weight to at most 45%: a hafnium of at least 10% by weight to at most 40% by weight, and a total ratio does not exceed 100% by weight.
Owner:DEXERIALS CORP
Condensed-ring compound and preparation method and application thereof
InactiveCN110698387AReduced bandgap widthPrevent backflowGroup 5/15 element organic compoundsSolid-state devicesOrganic electroluminescenceMaterials science
The invention discloses a condensed-ring compound and a preparation method and an application thereof. The condensed-ring compound has a structure represented by formula (I) or formula (II). The HOMOand LUMO energy levels of the fused-ring compound are completely separated, so that the energy gap width of the material is reduced, the three-wire energy level is improved, and the energy backflow from the object material to the main material is avoided to reduce the luminous efficiency; HOMO and LUMO energy levels are matched with adjacent materials, and the driving voltage is small. The devicehas large molecular structure size and good intramolecular conjugation, so it has good thermal stability, can avoid thermal decomposition of materials during film formation or use, avoids loss of material layer function, and improves luminous efficiency and luminous performance of the device. The invention also provides a preparation method of the fused-ring compound and its application as an organic electroluminescent material.
Owner:NINGBO LUMILAN NEW MATERIAL CO LTD
Light-emitting diode
InactiveUS7994518B2Reduce brightnessReduced luminous efficiencySolid-state devicesSemiconductor devicesEngineeringReflective layer
An LED includes a substrate having a substantially flat substrate surface, a plurality of electrodes extending through the substrate, an LED chip configured for emitting light, a first and a second coplanar reflective layers formed on the surface, and a light pervious encapsulation member mounted on the substrate surface. The light pervious encapsulation member covers the LED chip and the first reflective layer and a portion of the second reflective layer. The LED chip is mounted on the substrate surface and electrically connected with the electrodes. The first reflective layer and the second reflective layer are configured for reflecting the light emitted from the LED chip.
Owner:FOXSEMICON INTEGRATED TECH INC
Organic electroluminescent device and display
ActiveUS7358661B2Improve suppression propertiesReduced luminous efficiencyDischarge tube luminescnet screensElectroluminescent light sourcesDisplay deviceRefractive index
Owner:IDEMITSU KOSAN CO LTD
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