324results about How to "Improve lighting efficiency" patented technology

A new transparent conducting oxide (TCO), which can be expressed as Al_xGa_3−x−yIn_5+ySn_2−zO_16−2z; 0≦x<1, 0<y<3, 0≦z<2, has been used to improve the brightness and current spreading in GaN base LED process. The optical properties of this system are superior to regular Ni/Au transparent conducting layer in blue-green region, and the new Al₂O₃—Ga₂O₃—In₂O₃—SnO₂ system is able to increase the brightness at 1.5˜2.5 time to compare to regular process. Furthermore, the new transparent conducting oxide thin film has the highest conductivity, which is better than the Ni/Au transparent conducting thin film.

A built in beat diffusion lamp body for LED lamp was invented. The purpose of the invention is to solve the difficulties of poor heat conduction and diffusion caused by the small heat diffusion surface of the material of a conventional LED lamp. The lamp body is made of a set of heat diffusion vanes encircling the heat diffusion complex. The vanes and heat diffusion complex are made from Aluminum alloy in a single process of extrusion moulding. The transverse section of the heat diffusion body is volute shaped. The bottom of the heat diffusion complex is fixed to an aluminum board or an aluminum circuit: board by interference fit. The heat generated by the LED elements can be absorbed and diffused by the board, the heat diffusion complex and the surrounding diffusion element. The outward appearance of the heat diffusion lamp body may be shaped into cup, ladder, or cylinder likeness to satisfy the application requirement. The advantages of current invention are: efficient heat absorption, conduction, and diffusion, low cost for manufacturing, and aesthetic appearance.

A light source device adapted to generate an illumination light beam for illuminating an illuminated surface includes a light source adapted to emit a light beam, a light path conversion member adapted to rotate around an axis perpendicular to a center axis of the light beam emitted from the light source to convert a light path of the light beam emitted from the light source, an overlapping illumination element adapted to overlap a light beam emitted from the light path conversion member on the illuminated surface, the overlapping illumination element having an entrance position of the light bream input to the overlapping illumination element varies with time, and a rotating section adapted to rotate the light path conversion member.

An opposed terminal structure including a supporting substrate, a first terminal, a nitride semiconductor with a light-emitting layer, and a second terminal. The second terminal forms an opposed terminal structure with the first terminal, which can be formed in a variety of patterns.

A light-emitting diode device includes an epitaxial layer, a current blocking layer and a current spreading layer. The current blocking layer is disposed on one side of the epitaxial layer and contacts with a portion of the epitaxial layer. The current spreading layer is disposed on one side of the epitaxial layer and contacts with at least a portion of the current blocking layer.

Efficiency of leading out light released from an active layer, i.e. the external quantum efficiency, can be improved remarkably by processing a light lead-out surface to have an embossment. A layer containing a p-type dopant like magnesium (Mg) is deposited near the surface of a p-type GaN layer to diffuse it there, and a p-side electrode is made on the p-type GaN layer after removing the deposited layer. This results in ensuring ohmic contact with the p-side electrode, preventing exfoliation of the electrode and improving the reliability.

The present invention relates to an LED driver for driving a plurality of light emitting diodes (LEDs), comprising a current controller to control power supply of a predetermined power source unit to make a current flowing in the plurality of LEDs reach a predetermined target current value which sequentially changes corresponding to the respective LEDs; a plurality of divergence switches to flow or interrupt the current with respect to each of the plurality of LEDs; a bypass switch being connected in parallel with respect to the plurality of divergence switches and the plurality of LEDs and to flow or bypass the current supplied to the plurality of LEDs by being open or short-circuited; and a switch controller to sequentially open and close the plurality of divergence switches corresponding to change of the target current value and control the bypass switch to be short-circuited in a range where the current supplied to the LEDs increases, corresponding to the rise of the target current value. Thus, the present invention provides an LED driver which drives an LED in a low voltage to improve light efficiency.

A method to improve light extraction efficiency of a light emitting element such as an electroluminescent element is disclosed. Over a substrate, a first electrode, a light emitting layer, and a second electrode are sequentially stacked. The first electrode is a reflective electrode. The second electrode is an electrode which transmits visible light, and light emitted from the light emitting layer is extracted from the second electrode. In contact with a surface of the second electrode, many fine particles are provided. The fine particles have a refractive index which is equal to or higher than that of the second electrode. Light which passes through the second electrode is scattered and refracted by the fine particles. Accordingly, the amount of light which is totally reflected at an interface between the second electrode and a gas is reduced, and light extraction efficiency is improved.

A backlight unit is provided with LEDs having a cooling structure. The backlight includes a heat pipe, which is disposed below a PCB having the LEDs thereon, and a heat sink connected with the heat pipe. Heat generated from the LEDs conducts via the PCB and the heat pipe and is then radiated by the heat sink. The cooling performance of the backlight unit is thus enhanced and the temperature increase in the light emission region is thus suppressed, so that thermal reliability of the LEDs is enhanced and light efficiency is increased to increase the brightness and to decrease the power consumption.

A tip element for an otoscopic apparatus includes engagement features that permit selective attachment to two different tip attachment mechanisms. The tip element includes both interior and exterior engagement features that provide interchangeability with otoscopes having different tip attachment schemes. The tip element includes an increased distal aperture formed from a decreased slope that enables a larger field of view, permitting the entire tympanic membrane to be viewed at once. External engagement features permit ejection of the tip from the otoscope, as well as stackability of a plurality of tip elements.

A LED bulb and light module utilizes a LED light source and directs light therefrom in a manner which improves efficiency and illumination. Ideally, the LED bulb is structured to create a virtual image whereby the efficiency of light directed out of the module is greatly improved, even with a single LED light source. The LED bulb generally includes a light pipe receiving light from the LED light source and guides the light downstream to a downstream portion which redirects the light radially outwardly.

A chip coated LED package and a manufacturing method thereof. The chip coated LED package includes a light emitting chip composed of a chip die-attached on a submount and a resin layer uniformly covering an outer surface of the chip die. The chip coated LED package also includes an electrode part electrically connected by metal wires with at least one bump ball exposed through an upper surface of the resin layer. The chip coated LED package further includes a package body having the electrode part and the light emitting chip mounted thereon. The invention improves light efficiency by preventing difference in color temperature according to irradiation angles, increases a yield, miniaturizes the package, and accommodates mass production.

A replacement light fixture for directing light emitted from a light source toward an area to be illuminated, including a base member upon with the light source is positioned and a reflector assembly detachably secured to a first and second mounting brackets that are mounted to a portion of the preexisting light fixture housing such that a lens portion of the reflector assembly overlies the light source and such that substantially all of the light emitted from the light source passes through the lens portion

A process is disclosed for forming an OLED device, comprising: providing a substrate having a first electrode and one or more organic layers formed thereon, at least one organic layer being a light-emitting layer; forming a conductive protective layer over the one or more organic layers opposite the first electrode by employing a vapor deposition process comprising alternately providing a first reactive gaseous material and a second reactive gaseous material, wherein the first reactive gaseous material is capable of reacting with the organic layers treated with the second reactive gaseous material, wherein the temperature of the gaseous materials and organic layers are less than 140 degrees C. while the gases are reacting and wherein the resistivity of the protective layer is greater than 10⁶ ohm per square; and forming a second electrode over the conductive protective layer by sputter deposition.

The invention relates to an automatic sanding and polishing device for an industrial robot, wherein the industrial robot is served as the core of the device; the device comprises the industrial robot, an automatic shifting fixture, a polishing machine, and a force control program; and the device can be used for sanding and polishing the parts having complex exteriors, and is especially suitable for processing faucet, ironware, blade, and the like. A method for automatically sanding and polishing by using the device comprises the following steps: the automatic shifting fixture arranged on the tail end of the industrial robot is used for holding the parts; adjusting the position and posture of the industrial robot according to different areas for sanding or polishing of the parts; contacting the areas for sanding or polishing with a sanding belt of the polishing machine and keeping a certain contact force; controlling the size of the contact force by a force control mechanism; after finishing programming the whole surface of parts, using the industrial robot to perform the reprogramming operation; and sanding or polishing the parts having same exteriors in batch.

A liquid crystal display device includes a liquid crystal display panel and a backlight unit providing light to the liquid crystal display panel. The liquid crystal display panel includes a first substrate on which a thin film transistor is disposed, a second substrate facing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a first polarizer disposed on the second substrate having a plurality of metal patterns spaced apart from each other by an interval. The backlight unit faces the second substrate.

An array-type modularized light-emitting diode structure and a method for packaging the structure. The array-type modularized light-emitting diode structure includes a lower substrate and an upper substrate fixed on the lower substrate. A material with high heat conductivity is selected as the material of the upper substrate. The upper substrate is formed with multiple arrayed dents and through holes on the bottom of each dent. A material with high heat conductivity is selected as the material of the lower substrate. The surface of the lower substrate is formed with a predetermined circuit layout card. The bottom face of the upper substrate is placed on the upper face of the lower substrate with the through holes of the dents respectively corresponding to the contact electrodes of the circuit layout card of the lower substrate. Multiple light-emitting diode crystallites are respectively fixed on the bottoms of the dents. Via the through holes, the electrodes of the light-emitting diode crystallites are electrically connected with the contact electrodes. Then the dents of the upper substrate are sealed to prevent the light-emitting diode crystallites from being oxidized.

A virtual image display apparatus includes an organic EL device that outputs light having one kind of wavelength band, a light guide member, and a reflection-type volume hologram that is disposed on a first face of the light guide member and diffracts and reflects light of a predetermined wavelength band of the light that has entered. The organic EL device includes an optical resonance structure that causes the above-mentioned light of one-kind wavelength band to resonate.

A light guide plate includes a main body portion and inclined light guide portions having at least one recess. The main body portion has a first light incident surface, a bottom surface that is adjacent to the first light incident surface, and a light emitting surface that is opposite to the bottom surface. The inclined light guide portions disposed on the main body portion have a second light incident surface and at least one inclined surface. The second light incident surface is connected to the first light incident surface of the main body portion. The inclined surface is connected to the light emitting surface of the main body portion. At least one recess is formed between the inclined light guide portions. In addition, a wedge-shaped body can further be formed between the main body portion and the inclined light guide portions.

A light concentration device includes: a plate including two principal faces and an edge between the two principal faces, a refractive index gradient existing between the two principal faces, and a diffraction grating functioning in reflection or semi-reflection that cooperates with one of the principal faces of the plate having the highest refractive index, the principal face having the lowest refractive index forming a front entry face for the light, at least one exit zone for the light being disposed on the edge.

The invention relates to a visual-ergonomics-based linear dimming system, and aims to provide a linear dimming system based on brightness perceived by human eyes. By the system, a dimming curve can be calculated according to current brightness, target brightness and dimming time. A linear dimming principle is based on research results of visual ergonomics and psychophysics, namely the perceived brightness and actual brightness are logarithmically changed. A corresponding relationship among a dimming electrical parameter, the actual brightness and the perceived brightness is established, the variation curve of the electrical parameter is calculated by taking the linear variation of the perceived brightness as a target and according to the parameter setting of a user and then linear dimming is realized by directly controlling the electrical parameter according to the curve vibration. By the system, the perceived brightness can be linearly changed along with time in a dimming process which is more uniform and softer. The system can be used in places such as cabins and the like with relatively higher illumination requirements and in the field of indoor illumination.

Since a ridge-type optical waveguide generally has not strong light confinement, when it is compared with a strip-type optical waveguide, an optical waveguide loss is increased when the optical waveguide is bent. Accordingly, it is desirable to decrease an optical waveguide loss at a bent potion of the waveguide. An optical waveguide is provided which includes a semiconductor region, an optical waveguide provided between a first light confinement layer and a second light confinement layer formed in the semiconductor region, and at least one insulating film region formed in the semiconductor region and above at least one of an outside and an inside with respect to a curvature radius direction of the bent portion of the optical waveguide.

The backlight for a flat display device including a light source, a light guide plate and a surface hologram is provided. The light guide plate is installed at one side of the light source, and light from the light source travels in the light guide plate while being totally reflected. The surface hologram is formed on at least one surface of the light guide plate. The surface hologram has a pattern of a predetermined grating interval and a predetermined grating depth in order to diffract light at a predetermined angle toward the light guide plate.

A light emitting device having a vertical structure and a method for manufacturing the same, which are capable of increasing light extraction efficiency, are disclosed. The method includes forming a light extraction layer on a substrate, forming a plurality of semiconductor layers on the light extraction layer, forming a first electrode on the semiconductor layers, forming a support layer on the first electrode, removing the substrate, and forming a second electrode on a surface from which the substrate is removed.

A color solid-state imaging device including: a semiconductor substrate; a photoelectric conversion layer provided over the semiconductor substrate, for absorbing light of a first color among three primary colors so as to generate photocharges; plural charge storage regions arranged in a surface layer of the semiconductor substrate, for storing the photocharges; plural first photodiodes arranged in the surface layer of the substrate, for detecting mixed light of second and third colors among the three primary colors that has passed through the photoelectric conversion layer and for storing generated photocharges; plural second photodiodes arranged in the surface layer of the semiconductor substrate, for detecting light of the second color of the mixed light that has passed through the photoelectric conversion layer and for storing generated photocharges; color filter layers provided over the second photodiodes, for interrupting light of the third color; and signal reading units as defined herein.

Provided is a lighting unit for a vehicle capable of implementing surface light emission from a single light emitting surface. The light unit can function to implement a light emitting region in which at least two light colors are displayed or different light colors are implemented, or to locally emitting light.

The invention discloses an intelligent LED (Light-Emitting Diode) light supplementing indoor circulating economical planting and breeding system, which is characterized by comprising a plant culturing system, an aquarium fish breeding system, an LED plant light supplementing system, an air circulating system, a water circulating system and a control system, wherein the plant culturing system is connected with the aquarium fish breeding system through the water circulating system; plants are irrigated by using fish breeding water, and excrements of fishes are purified by using the plants, so that circular utilization of water and nutrients is realized; the LED plant light supplementing system is connected with the plant culturing system, so that illumination adjustment and supplement are performed on the plants, and healthy growth of the plants is facilitated; and the aquarium fish breeding system is connected with the air circulating system, so that air with a certain flow amount is pumped into a fish tank periodically, and the oxygen content in water is ensured. According to the economical planting and breeding system, a complete indoor economical planting and breeding system is constructed, and the entire system is simple in structure and low in cost; and meanwhile, the economical planting and breeding system has the effects of purifying indoor air, adjusting indoor air humidity and beautifying indoor environment.

Systems and methods for providing illumination suitable for imaging devices such as laser projection systems, wherein the illumination pattern is adjustable by modifying one or more characteristics of a controlled angle diffuser. In one embodiment, a highly collimated (e.g., laser light) beam is passed through a holographic diffuser to create a well defined cone angle for the light emanating from each point on the diffuser. This light is focused into an illumination image that is controlled by the prescription of the diffuser. In one embodiment, the diffuser can be positioned to alternately place different regions having different prescriptions in the optical path corresponding to the illumination image. In one embodiment, the diffuser can be continually moved to eliminate speckling and “worminess” in the illumination image.

In an LCD apparatus having a backlight assembly, a light guide plate includes an incident surface for receiving light, a reflecting surface for reflecting the light and an emitting surface for emitting the light. A linear distance between the reflecting and emitting surfaces is smaller than a height of the incident surface. An optical sheet is positioned at the emitting surface having a height lower than the height of the incident surface. Accordingly, although the height of the incident surface increases, the linear distance between the reflecting and emitting surfaces does not increase. Therefore, the light guide plate can obtain an area of the incident surface appropriate to efficiently receive the light, thereby improving a light efficiency of the backlight assembly and preventing an increase in a thickness of the backlight assembly.

The optical system for the Fresnel lens light has an ellipsoidal reflector (1), a light source (2) and a Fresnel lens (3). The distance (a) between the Fresnel lens (3) and the reflector (1) is changeable but is related to the changeable distance (b) between the light source (2) and the reflector (1) so that the aperture angle of the propagated light beam is variable but illumination intensity of the propagated light is maintained uniform. Surfaces of the at least one Fresnel lens and/or the reflector can be structured to provide more uniform illumination of a given area. The optical system is useful for lights for film, stage, studio and photography.