65results about How to "Uniform color temperature" patented technology

A process is described for wavelength conversion of LED light using phosphors. LKD dies are tested for correlated color temperature (CCT), and binned according to their color emission. The LEDs (12) in a single bin are mounted on a single submount (24) to form an array of LEDs. Various thin sheets (51, 52, 53, 54) of a flexible encapsulant (e.g., silicone) infused with one or more phosphors are preformed, where each sheet has different color conversion properties. An appropriate sheet (51) is placed over an array of LED (12) mounted on a submount (24) , and the LEDs (12) are energized. The resulting light is measured for CCT. If the CCT is acceptable, the phosphor sheet (51) is permanently laminated onto the LEDs (12) and submount (24) . The lamination (51) encapsulates each LED (12) to protect the LEDs (12) from contaminants and damage. The LEDs (12) in the array of LEDs on the submount (24) are separated. By selecting a different phosphor sheet for each bin of LEDs, the resulting CCT is very uniform across all bins.

The invention, which belongs to the LED technical field, more particular relates to white light LED with uniform color temperature and high color rendering performance. The white light LED provided in the invention comprises the basic components, which are also included in a common white light LED. The basic components are as follows: a LED chip, a packaging support, a silica gel, a fluorescence sheet, a lens, a reflection cup and a heat sink. The fluorescence sheet is in a shape of a spherical crown, wherein the center of the sheet is thick and the edge of the sheet is thin. The fluorescence sheet is above the LED chip as well as the fluorescence sheet and the LED chip are separated from each other, wherein the space between the fluorescence sheet and the LED chip is filled with the transparent silica gel. The fluorescence sheet absorbs photon emitted by the LED chip; after the conversion at energies, the photon is converted into photon with a longer wave length; the converted photon is combined with transmitted light that is emitted by the LED chip and permeates through the fluorescence sheet so as to generate white light. The white LED provided in the invention has an exquisite design. According to the invention, a yellow effect of light of each side of an ordinary white light LED can be eliminated, and thus a color temperature of each angle of space is even with good uniformity. Therefore, according to the invention, white light LED with high performance and low cost can be manufactured.

The present invention is directed to the provision of an LED light source that can easily adjust its chromaticity and a chromaticity adjustment method for such an LED light source. More specifically, the invention provides a chromaticity adjustment method for an LED light source having an LED device, a phosphor which absorbs a portion of light emitted from the LED device and emits light by wavelength conversion, and a resin material containing the phosphor and disposed so as to enclose the LED device, wherein an ink coating layer is disposed on a surface of the resin material in order to adjust chromaticity; the invention also provides an LED light source adjusted in such a manner.

The invention provides a secondary optical lens with an adjustable beam angle, capable of enabling a multi-chip LED (Light Emitting Diode) to irradiate uniform light spots. The secondary optical lens comprises a light collecting part in the central zone of the lens and a total reflection part at the periphery of the light collecting part, wherein the upper surface of the light collecting part is a micro lens array formed by a plurality of micro lenses, and the outside reflecting surface of the total reflection part is scale surface formed by a plurality of polyhedron scales. According to the light mixing function performed on the multi-chip LED by the micro lens array of the upper surface of the light collecting part and the polyhedron scales of the outside reflecting surface of the total reflection part, the secondary optical lens can acquire round light spots with even color temperature while changing the beam angle.

This invention relates to a package structure of a white light LED including a base, light emitting semiconductor elements and a cladding of a fluorescent colloid, in which, the light emitting semiconductor elements are set on the base, the cladding is adhered on the base and covers the semiconductor elements and is an arc lens formed naturally, the arc side of which includes a fluorescent powder layer distributed in the powder layer. This invented cladding of a fluorescent colloid forms an arc lens with natural surface tension and cohesion to increase the outside extraction efficiency of white light LED, besides, fluorescent powder is deposited on the arc side of the cladding of the fluorescent powder colloid uniformly to form a uniform distributed fluorescent powder layer to let white light LED generate uniform color temperature.

The invention provides a preparation method of a broadband gradient LED (Light-emitting Diode) fluorescent film. The preparation method is characterized in that broadband gradient LED fluorescent powder serves as a raw material; a uniform multicolour (red, green, blue and the like) fluorescent material film is deposited on an LED device or an LED lampshade gasket by a suspension method or a sol-gel method; and the broadband gradient LED fluorescent film prepared by the method has uniform isotropic color temperatures. The preparation method can be used for manufacturing and massively producing high-performance white LEDs with same performance, and can be used for preparing white LED devices, which can emit light approximating to sunlight, with high photoelectric conversion rates and high color rendering indexes. The broadband gradient LED fluorescent powder has a special structure and composition, and is good in dispersity, high in stacking density, great in scattering intensity and high in light-emitting efficiency.

The invention discloses a novel light emitting diode (LED) packaging structure. The structure comprises: a pedestal; a recessed cavity, which is formed in the pedestal; a heat sink, which is fixed in the recessed cavity; a cup bowl, which is formed on the heat sink; and an LED chip, which is fixed in the cup bowl. Besides, a pair of conductive feet are extended and are fixed in the pedestal; the LED chip is electrically connected with the conductive feet; a lens is formed on the pedestal and enables the LED chip and a part of conductive feet to be sealedly capped; and an external surface of the lens are provided with a layer of phosphor coating. According to the LED packaging structure provided in the invention, a traditional LED packaging mode is broken; a phosphor coating is directly transferred from an original chip surface to a surface of a lens, so that the phosphor coating is thoroughly far away from an LED chip and a luminous decay is substantially reduced; moreover, a shape and a thickness of the phosphor coating can be controlled accurately and an excitation area of the phosphor coating can be enlarged, so that an occurrence of a yellow ring can be avoided, a light extraction efficiency is improved and color temperatures of the phosphor coating are highly consistent.

The invention relates to an LED illuminating device and a preparation method thereof. The device is characterized by comprising an LED apparatus, an LED circuit board, a heat dissipator and a power supply controller. The LED apparatus is arranged on the LED circuit board, the LED circuit board is arranged above the heat dissipator, and the power supply controller is connected to the LED circuit board through a wire. The LED illuminating device can emit approximate natural light.

A white phosphor, a light emission device including the same, and a liquid crystal display (LCD) including the light emission device as a backlight unit. The white phosphor includes: 40 to 50 parts by weight of a blue phosphor selected from the group consisting of ZnS:(Ag,Cl), ZnS:(Ag,Al), ZnS:(Ag,Al,Cl), and a combination thereof; 23 to 36 parts by weight of a green phosphor including (Sr_1-xCa_x)Ga₂S₄:Eu (0≦x<0.2) and a compound selected from the group consisting of ZnS:(Cu,Al), ZnS:(Cu,Au,Al), and a combination thereof; and 20 to 30 parts by weight of a red phosphor selected from the group consisting of Y₂O₃:Eu, Y₂O₃:(Eu,Tb), Y₂O₂S:Eu, Y₂O₂S:(Eu,Tb), and a combination thereof.

The invention provides a preparation method of a broadband gradient LED (light-emitting diode) fluorescent film, which adopts chemical solution coating and comprises a sol-gel process and a process of preparing the LED broadband gradient fluorescent powder film by organic compound decomposition. The method is implemented by depositing a uniform broadband gradient and multicolor (red, green, blue and the like) multilayer LED fluorescent film on an LED device or LED lamp shade lining. The broadband gradient and multicolor (red, green, blue and the like) multilayer LED fluorescent film prepared by the method has uniform color temperature in all directions. The method can be used for manufacturing and mass production of white LED devices with low cost, high photoelectric conversion rate and high color rendering index (approximate to sunlight).

The invention relates to an improvement of a light-emitting diode (LED) module and a lighting fixture structure, wherein the LED module comprises a base, a reflector, a diffuser and a fluorescent glue layer. The base is provided with an accommodating part for accommodating at least one LED wafer, the reflector is arranged on the base, is provided with an accommodating space for accommodating a first colloid, and the diffuser is in butt joint with the reflector for sealing the first colloid, and the fluorescent glue layer is arranged between the diffuser and the first colloid. Through the structural design provided by the invention, more uniform light spots and color temperatures can be effectively realized, and moreover, the integral emergent optical efficiency is effectively improved.

The invention discloses a total internal reflection lens capable of uniform light mixing. The total internal reflection lens comprises a lens body, wherein the size of the lens body is gradually reduced from top to bottom, an accommodating cavity is formed in the bottom of the lens body and is used for installing LEDs, the accommodating cavity is arranged in the right middle of the bottom of the lens body, strip lines are arranged on an inner wall of the accommodating cavity and used for improving a light mixing effect, a red LED, a green LED, a blue LED and a white LED are arranged in the accommodating cavity, scales are arranged on a side surface of the lens body and are used for refracting light rays, a compound eye and a shading part are arranged at the top of the lens body, the compound eye is used for irradiating the light rays, the shading part is used for preventing the light rays from irradiating directly through the compound eye, the shading part is arranged in the right middle of the top of the lens body, and transparent balls are arranged in the lens body and are different from the lens body in refractive index. Light emitted from the LEDs in the accommodating cavity firstly is mixed through the strip lines and is then refracted through the scales for secondary light mixing, and finally, third light mixing is performed by the compound eye to achieve uniform light mixing.

A light-emitting diode package structure comprises a substrate, two electrodes arranged on the substrate, a light-emitting diode chip electrically connected with the electrodes, a package layer, fluorescent particles and diffusion particles. The fluorescent particles and the diffusion particles are mixed in the package layer. The average particle size of the diffusion particles is smaller than the average particle size of the fluorescent particles. Density of the diffusion particles at the position far away from the light-emitting diode chip is larger than the density of the diffusion particles at the position close to the light-emitting diode chip, and the density of the fluorescent particles at the position close to the light-emitting diode chip is larger than the density of the fluorescent particles at the position far away from the light-emitting diode chip.

The present invention discloses high power LED expansion light source, belonging to an electronic component, in particular a high power LED expansion light source component made from low power LED. It contains setting solid crystal zone formed by same continue plane and capable of setting several chips, packaging to one continue integral by epoxy or silica gel. Different inclined angle incline or paraboloid can be designed on side of solid crystal zone, according to different uses requirement of expansion light source. Said invention has advantages of effective heat sinking effect, high and uniform luminous intensity and colour temperature with low cost and simple technology.

The invention relates to an illuminating device. The illuminating device comprises a circuit board (2), a plurality of side walls (4) and a fluorescent cover (3), wherein at least one LED (Light Emitting Diode) chip (1) is arranged on the circuit board (2); the side walls (4) extend out of the circuit board (2); the fluorescent cover (3) is supported on the side walls; and the circuit board (2), the fluorescent cover (3) and the side walls (4) form a cavity (R) for accommodating the at least one LED chip (1). The illuminating device is characterized by further comprising at least one optical device (5) arranged in the cavity (R), wherein the optical device (5) has adjustable reflectivity for adjusting the spectral energy distribution and/or color temperature of emitted light of the fluorescent cover (3). The illuminating device provided by the invention is easy to manufacture, and is compact in structure; and a uniform and continuously-adjustable color temperature can be obtained from a light emitting surface.

A method of enhancing a color temperature of a color image includes calculating gains for input image signals based on a predetermined gain function. A first offset value corresponding to a change in a pedetermined color temperature of output signals is calculated. A second offset value is calculated based on the gains and the first offset value. The second offset value is added to a B signal of the output signals. A compensation gain is calculated in consideration of intensity of the B signal to which the second offset value is added. The compensation gain is added to a G signal. Thus, a desired color temperature can be obtained regardless of the intensities of R, G, and B signals.