36results about How to "Uniform white light" patented technology

The invention provides an LED lighting device and method that produces high intensity, spatially uniform, white light in the near and far fields in a reduced package size that does not significantly heat the surrounding environment, wherein the white light is produced by using a phosphor layer in conjunction with a single LED.

A white LED device is described, including two LED dies capable of emitting a first color light and a second color light, respectively, and a phosphor layer coated on at least one of the two LED dies. The phosphor layer is capable of emitting a third color light when stimulated by the first or second color light, and a light mixing structure is also disposed to mix the first to third color lights into uniform white light without chromatic deviation.

A high intensity mutli-wavelength illumination apparatus comprising an array of LEDs each of which has a predetermined spectral output that is emitted over a predetermined solid angle, an array of non-imaging concentrators the individual non-imaging concentrators of which are optically coupled in one-to-one correspondence with the LEDs, each non-imaging concentrator in the array of non-imaging concentrators operating to collect radiation emitted by each of the LEDs and to re-emit substantially all the collected radiation as a beam having a diverging solid angle smaller than said predetermined solid angle over which radiation is emitted by each of the LEDs, the non-imaging concentrators each having an entrance aperture for receiving radiation emitted by a corresponding one of the LEDs and an exit aperture from which the LEDs output emerges spatially and spectrally uniform in the near field of the exit aperture, and a light integrator having an entrance facet optically coupled to each of the exit apertures of the non-imaging concentrators for receiving radiation there through and conducting it to an exit facet thereof from which radiation is emitted for a downstream application, the light integrator being structured and arranged to substantially uniformly mix the individual beams emitted by each concentrator so that radiation emitted from its exit facet is uniformly colored.

An illuminator with blue and red LEDs, a reflector upstream of the LEDs for capturing upstream light emitted out of the back surfaces of the LEDs and redirecting downstream as useful illumination, a band pass filter for conditioning the downstream light, a phosphor layer for changing the spectral properties of light from the LEDs, and a non-imaging concentrator for creating a beam of illumination over a predetermined solid angle, uniformity, and spectral content.

A light emitting diode package includes a substrate, a plurality of light emitting diode chips, a fluorescence layer, and a plurality of reflecting layers. The light emitting diode chips, the fluorescence layer, and the reflecting layers are disposed on the substrate. The fluorescence layer covers the light emitting diode chips, and the reflecting layers are disposed right above the light emitting diode chips, respectively.

A white LED lamp secondary encapsulation structure capable of reducing blue-light hazards has a substrate (3), a blue light LED chip (4) fixed on the substrate (3), and a YAG yellow fluorescent powder layer (6) overlaid on the blue light LED chip (4). A fluorescent outer lampshade (1) covering the blue light LED chip (4) and the YAG yellow fluorescent powder layer (6) is further fixed on the substrate (3). YAG yellow fluorescent powder is provided on the fluorescent outer lampshade (1). The structure allows emission of more uniform, soft and harmonious colors of white light, and reduces the influence of heat dissipated by the blue light chip on the performance of the fluorescent powder, thus preventing color temperature drift due to the heat of the chip, prolonging the lifespan of the fluorescent powder, reducing blue-light radiation dosage, scattering blue-light radiation, and reducing potential hazards to human and organisms.

A surface light source device having LED clusters arranged in a matrix of rows and columns on a board. Each of the LED clusters includes red, green and blue LEDs arranged in a triangle. The LED clusters are grouped into A, E, C and D, which have the red LEDs located top, right, bottom and left, respectively, from a center of the triangle. The matrix of the LED clusters includes alternating first and second type rows arranged repeatedly from top to bottom of the matrix, terminating with the second type row. The first type rows each have first type cluster arrays of the LED clusters arranged in a repeating order of E, C, D and C from left to right. The second type rows each have second type cluster arrays of the LED clusters arranged in a repeating order of A, D, A and D from left to right.

The invention discloses a method for preparing fluorescent powder colloid. The method comprises the following processing steps: 1) preheating an epoxy resin A agent for 1 to 1.5 hours at the temperature of between 55 and 65 DEG C; 2) putting fluorescent powder, the preheated epoxy resin A agent and a curing agent B into a mixer in a mass ratio of 6-15: 100: 100, and evenly mixing the materials for 10 to 15 minutes at the stirring rate of 30 to 40rpm; and 3) vacuumizing the mixture for 5 to 10 minutes at the temperature of between 75 and 85 DEG C to remove bubbles in the mixture so as to obtain a finished product. The fluorescent powder, the epoxy resin A agent and the curing agent B are evenly mixed to prepare the fluorescent powder colloid so that the fluorescent powder is evenly dispersed in the fluorescent powder colloid; the fluorescent powder colloid applied to a product can remarkably improve the luminous quality, has even rays, good consistency and high excitation efficiency, enables a whole light-emitting diode to emit light in 360 degrees, and has no ray loss.

Light beams are outputted from optical devices and mixed together to obtain uniform white light free from color stains, thereby achieving a backlight unit improved in light mixing feature. In the backlight unit, a surface light source has a reflecting surface with a plurality of optical devices mounted thereon. An optical sheet is disposed in front of the surface light source. A reflecting layer is disposed between the surface light source and the optical sheet and has reflectivity varied by an incident angle of light beams from the optical devices. The backlight unit enables the light beams from the optical devices to be mixed together. The light beams outputted from the optical devices are effectively mixed together by a reflecting layer having reflectively varied by an incident angle of the light beams from the optical devices, thereby achieving uniform white light without color stains.

A method for producing a light emitting diode device includes the steps of preparing a base board; allowing a light semiconductor layer where an electrode portion is provided at one side in a thickness direction to be disposed in opposed relation to the base board, and the electrode portion to be electrically connected to a terminal, so that the light semiconductor layer is flip-chip mounted on the base board; forming an encapsulating resin layer containing a light reflecting component at the other side of the base board so as to cover the light semiconductor layer and the electrode portion; removing the other side portion of the encapsulating resin layer so as to expose the light semiconductor layer; and forming a phosphor layer formed in a sheet state so as to be in contact with the other surface of the light semiconductor layer.

Provided is a display apparatus having a structure capable of realizing reduction in thickness and border width.A display apparatus having a liquid-crystal panel prepared by enclosing a liquid-crystal material between a pair of glass substrates opposing to each other, a transparent plate opposed to the liquid-crystal panel, and an optical sheet arranged between the liquid-crystal panel and the transparent plate, and having a face smaller than the liquid-crystal panel, wherein the transparent plate is a glass plate having a wide surface of substantially a same shape as a wide surface of each of the glass substrate, and the display apparatus further comprises a frame body arranged between the liquid-crystal panel and the transparent plate, the frame body surrounding an outer periphery of the optical sheet, the frame body being thicker than the optical sheet.

A surface light source device having LED clusters arranged in a matrix of rows and columns on a board. Each of the LED clusters includes red, green and blue LEDs arranged in a triangle. The LED clusters are grouped into A, E, C and D, which have the red LEDs located top, right, bottom and left, respectively, from a center of the triangle. The matrix of the LED clusters includes alternating first and second type rows arranged repeatedly from top to bottom of the matrix, terminating with the second type row. The first type rows each have first type cluster arrays of the LED clusters arranged in a repeating order of E, C, D and C from left to right. The second type rows each have second type cluster arrays of the LED clusters arranged in a repeating order of A, D, A and D from left to right.

Provided are a semiconductor light emitting module and a method of manufacturing the same, which allow achieving high luminance light emission as well as lightweight and compact features. In a semiconductor light emitting module (101), a projecting portion (202) serving as a reflecting member is formed on a metal thin plate (102) to surround a semiconductor light emitting element (104). The semiconductor light emitting element (104) is connected to a printed board (103) by using a wire (201), for example. The projecting portion (202) is formed by pressing and bending the metal thin plate (102) from a back surface, for example, to surround the element and to be higher than the semiconductor light emitting element (104).

A backlight module has a light guide plate and a plurality of light sources. The light guide plate includes a light exit surface, a plurality of light entrance surfaces round the light exit surface, and a plurality of light guide portions disposed on the bottom surface opposite to the light exit surface. The light guide portions corresponding to the same imaginary circle center constitute a concentric arc-shaped light guide portion set. The imaginary circle center of each light guide portion set is located at the outer side of the light entrance surfaces. Light rays projected to one of the light entrance surfaces from the imaginary circle center of each light guide portion set are guided to a light exit surface by the light guide portion set. The wavelength of the light ray projected by each light source is not equal to that of the light projected by another light source.

The present invention provides a thermosetting silicone resin sheet having a phosphor-containing thermosetting silicone resin layer formed in the form of an LED device and a method for producing the same, and a light-emitting apparatus using the thermosetting silicone resin sheet and a method for producing the same. The present invention was accomplished by the phosphor-containing thermosetting silicone resin sheet comprising a substrate film and a phosphor-containing thermosetting silicone resin layer that is a plastic solid or a semi-solid at room temperature composed of a single layer having no adhesive layer, formed by printing and molding a phosphor-containing thermosetting silicone resin composition on the substrate film in the form of an LED device.

Provided are a semiconductor light emitting module and a method of manufacturing the same, which allow achieving high luminance light emission as well as lightweight and compact features. In a semiconductor light emitting module (101), a projecting portion (202) serving as a reflecting member is formed on a metal thin plate (102) to surround a semiconductor light emitting element (104). The semiconductor light emitting element (104) is connected to a printed board (103) by using a wire (201), for example. The projecting portion (202) is formed by pressing and bending the metal thin plate (102) from a back surface, for example, to surround the element and to be higher than the semiconductor light emitting element (104).

An arrangement matrix of primary color LEDs is provided. The arrangement matrix includes a first LED, a second LED and a third LED. The first LED, the second LED and the third LED are arranged to form a 4×4 lowest matrix unit. The ratio of the numbers of the first LEDs, the second LEDs and the third LEDs is 2:1:1. The first LED, the second LED and the third LED are presented as α,β, and γ. The arrangement of the lowest repeat matrix unit is shown below:[αβαγγαβααγαββαγα].

The invention discloses a novel LED (light emitting diode) white light lamp and a white light generation method of the lamp. The LED white light lamp comprises a substrate arranged in a lamp body, a blue light device or a white light device arranged on the substrate, at least one blue LED chip arranged in the blue light device or the white light device, and a lamp shade arranged in front of the lamp body, wherein yellow fluorescent powder is sprayed on the inner surface or outer surface of the lamp shade. The white light generation method of the novel LED white light lamp comprises the following steps: the blue LED chip in the blue light device generates a blue light to excite the yellow fluorescent powder on the inner wall of the lamp shade to generate white light on the surface of the lamp shade; and the blue LED chip in the white light device generates a blue light to excite the yellow fluorescent powder on the inner wall of the lamp shade to generate white light on the surface of the lamp shade. The LED lamp produced by a new method can effectively lower the temperature of the light emitting device because the white light is not excited on the light emitting device, thereby prolonging the service life of the lamp.