69results about How to "Increase output brightness" patented technology

An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). An exemplary apparatus comprises: a plurality of LEDs coupled in series to form a first plurality of segments of LEDs; a plurality of switches coupled to the plurality of segments of LEDs to switch a selected segment into or out of a series LED current path in response to a control signal; a current sensor; and a controller which, in response to a first parameter and during a first part of an AC voltage interval, generates a first control signal to switch a corresponding segment of LEDs into the series LED current path; and during a second part of the AC voltage interval, generates a second control signal to switch a corresponding segment of LEDs out of the first series LED current path.

The present invention discloses a LED light-emitting column and a LED light using the same. The LED light-emitting column comprises a high thermal conductivity tube and at least one series of LED chips disposed on an outer surface of the high thermal conductivity tube. The LED light comprises a light-transmitting bulb shell vacuum-sealed and filled with a heat dissipation and protection gas, a LED driver and an electrical connector. The LED light-emitting column is fixed within the bulb shell. Electrical lead of the LED light-emitting column is connected with an outer power supply through the driver and the electrical connector. The LED light is a single bulb shell light, a multi-tube light or a U-type light.

A planar package structure for high power light emitting diode, comprising: a substrate; a package material; a light emitting diode chip disposed on the substrate, having a main light emitting surface served as a light source; and a planar optical modulation unit disposed on the package material, so that the planar optical modulation unit is above the main light emitting surface, and utilized for modulating the optical phase of the light source. The planar optical modulation unit can perform a refractive optical phase modulation or a diffractive optical phase modulation such that a thin and planar high power light emitting diode package element with function of optical phase modulation is obtained.

The invention relates to a laser hybrid light source projector and a light source device thereof. The light source device comprises a blue LED light source, a red LED light source, a green LED light source, lens groups at the front ends of the light sources, a blue semiconductor laser tube, a lens group at the front end of the blue semiconductor laser tube, a spectroscope A and a spectroscope B; the surface of the green LED light source is provided with green fluorescent powder; the green LED light source is opposite to the semiconductor laser tube, the spectroscope B is located between the green LED light source and the semiconductor laser tube, the blue LED light source is arranged at one side of the spectroscope B, and the spectroscope A is arranged at the front of the red LED light source. The laser hybrid light source projector does not use the light source system of a laser projector with a color wheel, so that the influence of the color wheel on the picture quality is avoided; the blue semiconductor laser irradiates the fluorescent powder on the green LED, the brightness of the original green LED is obviously improved without increasing the numerical aperture of the light emitting area of the LED, and accordingly the output brightness of the projector is improved.

A light source is described where the light emitted by a solid-state light emitting device such as an LED is coupled into an optical waveguide such as an optical fiber. A highly reflective coupler (reflector) is disposed around the LED and a segment of the waveguide adjacent the LED. Light emitted from the LED that falls outside of the numerical aperture of the waveguide leaks out of the waveguide, but is reflected back to the waveguide by the reflector. The reflected light is re-reflected or scattered by the LED or the substrate the LED is mounted on, and the re-reflected or scattered light that falls within the numerical aperture of the waveguide is coupled into the waveguide. As a result, light coupling efficiency is increased and the output brightness of the light at the other end of the fiber is enhanced.

The embodiment of the invention provides a light source device and an image display device. The light source device comprises a first laser system, a second laser system and a fluorescent wheel; the first laser system comprises a first laser group and a first optical transmission assembly group; the second laser system comprises a second laser group and a second optical transmission assembly group; and the fluorescent wheel comprises a fluorescent area and a transmission area, wherein a first polarized light beam generated by the first laser group and a second polarized light beam generated by the second laser group irradiate two opposite surfaces of the same area on the fluorescent wheel respectively. Therefore, the optical transmission assemblies corresponding to the laser systems can simultaneously output two light beams, the two light beams can be superimposed to obtain high-brightness mixed white light, and the output brightness of the light source device and the image display device is improved accordingly.

The invention belongs to the technical field of semiconductor devices and preparation thereof, and relates to several GaN-based light-emitting tubes and preparation methods thereof. A device is composed of a substrate, an n type GaN buffer layer and a lower limit layer 2 epitaxially grown on the substrate, a GaN material multiple quantum well light-emitting layer 3, a p type GaN upper limit layer 4, a p type InxGa1-xN cover layer 5, an upper electrode 6 and a lower electrode 7. The light-emitting tube and the preparation method of the invention are characterized in that the upper electrode 6 is prepared to have a reflector function, a p type InyGa1-yN phase matching layer 8 is grown between the cover layer 5 and the upper electrode 6, the substrate 1 is an n type Sic single crystal substrate, a ZnO thin film layer 9 is prepared under the substrate 1 or a ZnO nanowire layer 11 is also prepared under the substrate 1, and the electrode 7 is prepared under the substrate 1 by only covering 5%-20% area. The invention provides a novel large-power SiC substrate vertical structure light-emitting tube and a preparation method thereof based on advantages that a SiC substrate crystal lattice and a GaN are well matched, electric conduction performance and heat conduction performance are both higher, and price is moderate.

The invention provides a compact liquid crystal projection light engine system using a mixed light source. The light engine system comprises a light source module, a polarized light management module, an image signal module and a projection lens. The light source module comprises a high-brightness laser, a noncoherent LED (Light Emitting Diode), a fluorescent device and the like; the output brightness of the projection system is largely increased and safety, environment friendliness, colorful projected image and high-definition image quality are obtained. The polarized light management module comprises a polarization beam splitter (PBS), a polarization color combining device and the like; three-primary-color mixed lights in different polarization states are integrated into the same polarized light and radiate to the image signal module; the image signal module is a single reflective liquid crystal light modulating device and is used for loading the image signals to the three-primary-color polarized light in sequence according to the image signal corresponding to each primary color; and a projection lens is used for projecting the light carrying the image signal to a screen.

The invention discloses a multi-color wheel synchronization method and a laser projection device. A first area in a wheel surface of a first color wheel is detected through a first sensor group, and a first level jump signal is generated when the first color wheel detects the first area for the first time during each rotation cycle; a second area in a wheel surface of a second color wheel is detected through a second sensor group, and a second level jump signal is generated when the second color wheel detects the second area for the first time during each rotation cycle; and whether the time difference between the first level jump signal and the second level jump signal is a threshold is judged, and if not, the rotation speed of the first color wheel and/or the second color wheel is adjusted to enable the time difference between the first level jump signal and the second level jump signal to be the threshold.

The embodiment of the invention provides a light source device and an image display device. The light source device comprises at least two groups of laser systems and a fluorescent wheel, wherein each group of laser systems comprises a group of laser devices and a group of transmitting optical components; the fluorescent wheel comprises a fluorescent wheel substrate; the fluorescent wheel substrate comprises fluorescent regions and transmission regions, which correspond to each group of laser devices; each fluorescent region corresponding to each group of laser devices is used for sending out at least one second light beam which is different from a first light beam in wavelength under irradiation of the first light beam generated by the laser devices; each transmission region corresponding to each group of laser devices is used for transmitting the first light beam generated by the laser devices; and each transmitting optical component is also used for merging the first light beam and the second light beam to form a mixed white light. Therefore, the output brightness of the light source device and the image display device is improved.

The invention relates to high-power semiconductor laser device preparation technology, especially a multiple light beam coupling high-power semiconductor laser device, including four semiconductor laser devices with identical polarization state, a wavelength selection element, a beam-expanding focusing device. The wavelength of two semiconductor laser devices of the four semiconductor laser devices is Lambada1, and the wavelength of another two is Lambada2; the two semiconductor laser devices with same wavelength as a group, and the another two semiconductor laser devices with same wavelength as the other group, wherein the two groups form two light beam coupling light sources by a polarization coupled device; the two light beam coupling light sources are coupled into a beam by the wavelength selection element, to transmit to the beam-expanding focusing device to send out. The invention provides most advanced and feasible preparation technology for correlation technique field of demand on ultra-high-power semiconductor laser device until today.

A wavelength conversion device includes a substrate, a reflective member, and a wavelength conversion member. The reflective member is disposed on the substrate and includes a continuous-phase material and nano particles. The nano particles are distributed in the continuous-phase material. A refractive index of the continuous-phase material is different from a refractive index of the nano particles. The wavelength conversion member is disposed on the reflective member. The reflective member is configured to reflect the light converted from the wavelength conversion member to output.

The present application provides a semiconductor laser spectrum combining and frequency multiplication device and relates to the field of laser devices. The semiconductor laser spectrum combining andfrequency multiplication device comprises a semiconductor laser, a conversion lens, a diffraction grating, a frequency multiplication crystal and an output coupling mirror which are arranged successively, wherein the semiconductor laser is located at the front focal plane of the conversion lens; the center of the diffraction grating coincides with the back focus of the conversion lens; the multiple parallel beams emitted by the semiconductor laser are focused to the diffraction grating by the conversion lens, and coupled by the diffraction grating into combined light to be output; the output coupling mirror reflects the fundamental-frequency light, and increases the permeability of the frequency-multiplied light. The combined light output by the diffraction grating is subjected to the frequency multiplication of the frequency multiplication crystal and is output by the output coupling mirror. The device achieves spectrum combining by the diffraction grating, increases output power andbrightness, and the power density and conversion efficiency of the laser in the frequency multiplication crystal, and reflects the fundamental-frequency light and increases the permeability of the frequency-multiplied light by the output coupling mirror to obtain high-power and high-efficiency frequency-multiplied laser output.

The embodiment of the invention provides a light source device and an image display device. The light source device comprises a first laser system, a second laser system and a fluorescent wheel, wherein the first laser system comprises a first group of laser devices and a first group of transmitting optical components; the second laser system comprises a second group of laser devices and a second group of transmitting optical components; the fluorescent wheel comprises a fluorescent region and a transmission region; first polarized beams generated by the first group of laser devices and second polarized beams generated by the second group of laser devices irradiate two opposite surfaces of the same region of the fluorescent wheel respectively; obviously, the transmitting optical components corresponding to each laser system simultaneously output beams respectively; and two beams are superposed to obtain a high-brightness hybrid white light, so that the output brightness of the light source device and the image display device is improved.

A display apparatus and a method of controlling the display apparatus are provided. The display apparatus includes a display comprising a liquid crystal layer, and a backlight unit that outputs light toward the liquid crystal layer; an illuminance sensor provided at one side of the display and that measures illuminance; and a processor that configured to determine output brightness of the display based on a difference between illuminance measured by the illuminance sensor when the backlight unit is turned on and illuminance measured by the illuminance sensor when the backlight unit is turned off, and control intensity of light output from the backlight unit to be adjusted corresponding to the difference.

A wavelength conversion device includes a substrate, a reflective member, and a wavelength conversion member. The reflective member is disposed on the substrate and includes a continuous-phase material and nano particles. The nano particles are distributed in the continuous-phase material. A refractive index of the continuous-phase material is different from a refractive index of the nano particles. The wavelength conversion member is disposed on the reflective member. The reflective member is configured to reflect the light converted from the wavelength conversion member to output.