31results about How to "Reduce the number of light sources" patented technology

The invention discloses a coherent passive optical network system and signal transmitting and receiving method, and relates to an optical access network. The method includes the following steps that in the downlink direction, k multi-carrier signal transmitting-receiving devices in an OLT have high-speed DACs, each multi-carrier signal transmitting-receiving device generates N downlink digital signals in a digital method, the k multi-carrier signal transmitting-receiving devices and a wavelength division multiplexing and demultiplexer of one k path are combined to generate dense or super-dense wavelength division multiplexing signals, the dense or super-dense wavelength division multiplexing signals are selective received by a coherent ONU after passing a power distributor, and the coherent ONU achieves selection of channels by adjusting LO wavelength in coherent detection. The coherent passive optical network system is low in cost, simple in structure, high in sensitivity and suitable for a super-dense wavelength division multiplexing network.

The invention provides a GPU (Graphics Processing Unit) dynamic frequency modulation method, device and system, which are used for solving the technical problem that in the prior art, a proper processor operation frequency cannot be found to reduce the power consumption of a processor. The method comprises the following steps: obtaining the graphic rendering amount of each frame of image in real time; performing classification processing on the graphic rendering amount to obtain a category corresponding to the graphic rendering amount; a sample database is called, the target frequency corresponding to the category is determined, and the sample database comprises the corresponding relation between multiple categories and frequency parameter sets; and adjusting the working frequency of an image processor GPU of the VR equipment to the target frequency.

The invention discloses a passive optical network link monitoring system and method based on a tunable laser. The system comprises a monitoring server, a tunable laser, a three-port circulator, a wavelength division multiplexer, a fiber grating encoder, an optical receiver and a data acquisition card. The system scans coded wavelengths one by one by adopting the tunable laser at the transmitting end, receives reflected signals of the coded wavelengths in turn by using the single-channel optical receiver at the receiving end, and finally judges the link state of a passive optical network according to the reflected signals of all coded wavelengths, thereby overcoming the defects that the cost is high, it is not conducive to monitoring the capacity expansion of users and that the central wavelength of a fiber grating is affected by the temperature in the prior art.

The invention relates to the technical field of ultraviolet light application, in particular to an ultraviolet light source assembly, an ultraviolet optical system and an ultraviolet printing device. The ultraviolet light source assembly comprises a plurality of light sources for emitting ultraviolet light and further comprises a light collecting device. The light collecting device is matched with the light sources, so that all or part of the light emitted by the light sources enters the light collecting device, the light collecting device converges the light entering the light collecting device to a plane, and a continuous strip-shaped irradiation area is formed in the plane. The light collecting device is adopted for collecting and converging the light emitted by the light sources, and the continuous strip-shaped irradiation area is formed on the plane. Compared with a traditional ultraviolet light source assembly, identical irradiation intensity is achieved; and by means of the structure, the number of the needed light sources is far smaller than that of light sources needed by adopting a traditional structure, and therefore the structure of equipment is simplified, heat radiation difficulty is reduced, and then the reliability of the equipment is improved.

The invention relates to an LED light source and a preparation method thereof and a backlight module, and belongs to the technical field of display. The LED light source comprises a light source substrate, a green light chip, a blue light chip and packaging glue. The green light chip and the blue light chip are fixedly arranged at the upper end of the light source substrate, the green light chip and the blue light chip are both electrically connected with the light source substrate. The packaging glue is fixedly arranged at the upper end of the light source substrate, the green light chip and the blue light chip are packaged in the packaging glue, diffusion powder is mixed in the packaging glue, and the diffusion powder can perform primary scattering on light rays emitted by the green light chip and the blue light chip. Compared with the prior art, the light emitting angle of the LED light source can be increased, the cost is reduced, and the service life of the backlight module is prolonged.

The invention discloses a method and a device for producing a dark spot on the basis of a transparent medium small ball. The method comprises the following step that: a tangent polarization light beam is incident to the microndimension transparent medium small ball, so that the dark spot is obtained at the emergent end of the microndimension transparent medium small ball. The device comprises a device for producing the tangent polarization light beam, a microscopic objective lens, the microndimension transparent medium small ball and cover glass for fixing the microndimension transparent medium small ball sequentially; and the tangent polarization light beam is initially focused by the microscopic objective lens and further focused by the microndimension transparent medium small ball so as to obtain the dark spot. In the invention, a single light beam serves as a working light beam of the system, so the system cost is saved and the practicability is enhanced; meanwhile, the size of the focused dark spot is up to 0.414 lambdas and much smaller than that of the dark spot focused by a common tangent polarization light beam. Furthermore, the quality of the light beam is improved, so actual application is facilitated.

An optical plate comprises a transparent body which comprises a light extraction surface and a bottom surface opposite to the light extraction surface; wherein, a plurality of triangular pyramid shaped grooves and a plurality of rectangular pyramid shaped grooves are formed on the light extraction surface; each rectangular pyramid shaped groove is enclosed by four triangular pyramid shaped grooves. The invention also provides a backlight module adopting the optical plate. The backlight module has the advantages of improving efficient utilization ratio of light and enjoying uniformity of light emission.

The invention discloses a shooting method. The shooting method comprises the steps of processing a preview image to determine the number of light sources in the preview image; judging whether the number of the light sources is more than a predetermined number; sending a prompt of adjusting a view field when the number of the light sources is more than the predetermined number; and when the numberof the light sources is less than or equal to the predetermined number, detecting the color temperature of the light sources and performing white balance according to the color temperature of the light sources. The invention also discloses an imaging device, computer equipment and a computer readable storage medium. According to the shooting method, the imaging device, the computer readable storage medium and the computer equipment provided by the embodiment of the invention, the number of light sources of the preview image is detected, and the computer equipment is controlled to send out theprompt of adjusting the view field when there are multiple light sources, so as to assist the user to adjust the view field to reduce the number of the light sources in the preview image, and thus after being subjected to white balance, the image shows the relatively accurate color.

The invention provides a straight down type backlight source module. The straight down type backlight source module comprises light sources, a backboard, a reflection sheet and a diffusion board. The reflection sheet is located above the backboard, the diffusion board is located above the reflection sheet, the light sources are located between the backboard and the diffusion board, and a plurality of light diverging devices are arranged around the light sources and located between the backboard and the diffusion board. According to the straight down type backlight source module, light irradiated on the diffusion device can be refracted, light between the light sources and the diffusion board can be effectively diffused more evenly, the light mixing distance between the light sources and the diffusion board is reduced, the ultra-thin design of the straight down type backlight source module is achieved, and the number of the light sources is reduced.

The invention discloses a reflector cup type airport runway emergency LED lamp which comprises a lampshade, an aluminum substrate, a reflector cup, a positioning column and an LED light source. A curved surface of the reflector cup is a 5-order odd polynomial surface, the inner diameter of the reflector cup ranges from 116mm to 120mm, the coefficient K of the curved surface ranges from 1000 to 1200, and the radius of the curved surface ranges from 2000mm to 2200mm. Owing to unique optical and structural design of the reflector cup of the airport runway emergency LED lamp, a 4-degree included angle is formed between the direction of a primary ray of rays projected onto the reflector cup and a horizontal plane, the light emitting angle of the whole lamp is 360 degrees, and the LED rays maximally irradiate in a specified direction. When an airplane flies at the height of 500 meters, and light of the airport runway emergency LED lamp can be found at a position 10 kilometers away from an airport.

The invention provides a dual-light three-color optical system and a sighting telescope thereof. The dual-light three-color optical system comprises a green light chip module, a red light chip module and a rectangular prism, the green light chip module and the red light chip module are vertically arranged; the geometric center of the cubic prism is arranged at the intersection of emergent light rays of the green light chip module and the red light chip module; and a composite film is plated on the diagonal plane, extending along the angular bisector of the included angle of the emergent light rays of the green light chip module and the red light chip module, of the cubic prism, and the composite film is used for totally reflecting the emergent red light of the red light chip module and transmitting the emergent green light of the green light chip module. By arranging a red light source and a green light source with the emergent light perpendicular to each other, green light, red light or yellow light and the like are generated through a control circuit by means of the prism and the total reflection film or the transmission film, and the number of the light sources and the size and weight of the sighting telescope are greatly reduced.