36results about How to "Improve dimming efficiency" patented technology

The invention relates to a LED constant current drive circuit with light dimming function, comprising a LED constant current supply circuit, an analog LED current regulating circuit and a digital LED current regulating circuit. The invention has the improvement that the digital LED current regulating circuit comprises a pulse width measuring circuit for a digital light-dimming signal and a D/A converter converting a pulse width attribute output by the pulse width measuring circuit into an analog voltage value. The invention uses the pulse width measuring circuit and the D/A converter to convert a digital light-dimming PWM signal into an analog signal, and then the analog signal is sent to an analog light-dimming input end to carry out analog light dimming; thus, the digital light dimming of the LED constant current drive circuit has the same light-dimming efficiency with analog light dimming, which solves the problem of low efficiency of digital light dimming. Simultaneously, the invention also has the characteristic of high light-dimming precision by further improvement.

The invention provides a dimming backlight partition dimming control method, an intelligent terminal and a storage medium. The dimming backlight partition dimming control method is used for regulatingand controlling the brightness of a backlight source of an intelligent terminal in a partition manner, and comprises the steps that an intelligent terminal mainboard SOC obtains the image partition information and the brightness information corresponding to the image partition information, and sends the image partition information and the brightness information to an FPGA; the FPGA receives and analyzes the image partition information and the brightness information, generates a partition control signal according to the image partition information and the brightness information, and sends thepartition control signal to a driving chip; and the driving chip receives the partition control signal and drives and controls the image partition brightness according to the partition control signal.The display images and brightness information are obtained through the SOC of the intelligent terminal mainboard, and the driving chips corresponding to the dimming backlight partitions are uniformlycontrolled by the FPGA, so that the dimming efficiency and the dimming effect of the dimming backlight partitions are improved.

A light adjusting device of electrical filter is characterized in that a motor base is fixed on a bottom plate of an instrument; a light adjusting motor is fixed on the motor base; a motor shaft on the light adjusting motor is connected with a worm which rotates on a worm rolling bearing; a worm wheel is fixed on a support base and rotates on a worm wheel rolling bearing; N round holes with identical diameters are uniformly formed on the worm wheel, N filters with different transmittances are inserted in the round holes and fixed on the worm wheel; a zero-position diode pair and a position diode pair are arranged on a bending plate on the worm wheel; the worm can rotate when the light-adjusting motor is electrified and is engaged with the worm wheel to drive the worm wheel to rotate, the position light emitting diode emits position signals during the rotation process of the worm wheel, and the position receiving diode receives the signals and transmits the signals to a light-adjusting motor controller to sequentially display the position of each filter. The invention changes the light adjustment manner of photoelectric instrument from single manual adjustment to electrical adjustment, thus satisfying the automatic requirement of modern optical instruments.

The invention provides a straightness interference measuring device insensitive to an incident angle. The device comprises an interferometer host system, a double Wollaston prism, a double-sided right-angle roof reflector and a detection receiving unit, the interferometer host system comprises a laser emission optical system, the laser emission optical system emits a measuring light beam, after passing through the double Wollaston prism, the light is divided into two beams of cross-polarized light, and the light is reflected by the double-sided right-angle roof ridge reflector and then returns to the detection receiving unit for analysis of interference signals, and relative distance information is obtained. The device has the beneficial effects that the double Wollaston prism is adopted as the straightness interference mirror, so that the incident light angle is not sensitive, and the measurement precision can be obviously improved especially in the verticality measurement application; a parallel light beam polarization element with the adjustable shearing difference is adopted, and the problem that an existing straightness interference measurement device has a measurement blind area can be solved.

The invention belongs to the technical field of light control, and discloses a light control method and a system for improving the yield and quality of green pomelo. The light control system for improving the yield and quality of green pomelo comprises a solar power supply module, a light intensity detection module, a video monitoring module, a main control module, an LED module, a dimming module,a light time setting module, a fault detection module and a display module. The LED dimming system based on the method of the invention has the advantages of high dimming efficiency and simple operation. At the same time, the fault detection module simplifies the structure of LED lighting system and reduces the maintenance difficulty and cost of the system. The invention realizes the fault detection of the LED lamp without setting a plurality of fault detection devices through the mode of control bus + light/electricity conversion, thereby achieving the technical effects of simplifying the lighting system structure and reducing the system maintenance difficulty and cost.

The invention discloses an area array type laser radar optical path system, which comprises an array type transmitting module composed of a plurality of laser diodes arranged according to an array, and laser beams output by the plurality of laser diodes form a laser beam area array; an array type receiving module, wherein the array type transmitting module comprises a plurality of avalanche photodiodes arranged in an array; and the lens module is arranged between the array type transmitting modules and is used for constraining the transmission of laser beams. According to the technical scheme,the transmitting end and the receiving end are designed to be area array type transmitting and area array type receiving, so that high integration of the transmitting assembly and the receiving assembly is realized, the production process is simplified, the light modulation efficiency is improved, and the product cost is reduced; moreover, compared with linear array emission, the area array emission can greatly improve the scanning resolution of the laser radar, gives consideration to the focusing performances in the horizontal and vertical directions, and enables the focusing effect to be better.

The invention discloses an adjustable light emitting module and a manufacturing method thereof. The adjustable light emitting module comprises a substrate, at least two light emitting diodes and connecting wires; at least two light emitting diodes are different in power, light color or color temperature; at least two light emitting diodes are arranged on the upper surface of the substrate and areconnected in series through the connecting wires; the two ends of each light-emitting diode are provided with short-circuit connecting sections, and the first ends of the short-circuit connecting sections are connected with the connecting wires; the substrate is provided with a dimming component, and the dimming component is used for connecting the second ends of at least two short-circuit connection sections for short circuit of the corresponding light-emitting diodes, and dimming is achieved. According to the adjustable light-emitting module and the manufacturing method thereof, rapid dimming can be carried out on the same substrate, and the dimming efficiency is improved; moreover, the light source storage cost is omitted, and the labor cost can be effectively saved.

The invention provides an LED dimming circuit, a chip, wearable equipment and an LED dimming method, and aims to solve the technical problem of low LED dimming efficiency in the prior art. According to the LED dimming circuit, the chip, the wearable equipment and the LED dimming method, a first optical digital code value is received, the first optical digital code value is compared with a preset target threshold range, whether the dimming control signal of the LED driving circuit needs to be adjusted and the dimming information when adjustment is needed or not is determined according to the comparison result, the current dimming control signal is adjusted according to the dimming information, and the adjusted dimming control signal is sent to the LED driving circuit; and through the above mode, the intensity of the light signal formed by superposing the light emitted by the LED and the ambient light is controlled within the detection range corresponding to the target threshold range, so that adaptive adjustment of the dimming control signal is realized, and the LED dimming efficiency is improved.

The invention provides a headlamp factory dimming test system for a fuel cell hydrogen energy automobile. A fuel cell hydrogen energy automobile to be dimmed is located above a trench. The headlamp factory dimming test system comprises a headlamp of the fuel cell hydrogen energy automobile to be dimmed, a dimming test screen, a camera, a display screen and a dimmer. During dimming operation, the headlamp is turned on, a light beam of the headlamp irradiates the dimming test screen, the camera shoots a light image of light irradiated on the dimming test screen when the headlamp is turned on, the light image is displayed on the display screen, the light image on the display screen is observed while a dimming gear of the dimmer is rotated, and after the light beam in the light image irradiates a position specified by production design, dimming is completed, the headlamp is turned off, and a dimming test is completed. The headlamp factory dimming test system has the beneficial effects thatthe dimming light can be conveniently and quickly found, dimming is convenient, inconvenience caused by multiple times of turning is avoided, meanwhile, the dimming efficiency is improved, and the cost is saved.

A dimming system and a dimming converter and load dimming method thereof are provided. In the dimming converter, a cutting phase determination unit is connected with an input terminal and configured to determine phase angle information of a power supply signal of an output of a load terminal in a dimmer; an output unit is configured to output a dimming signal corresponding to the phase angle information determined by the cutting phase determination unit from a dimming output terminal to a load of the dimming system according to a correspondence relationship between the phase angle information and the dimming signal stored in a storage unit and to output a phase-cut power source signal from a supply output terminal to the load. The dimming system can be compatible with a large number of loads with different dimming requirements to thereby improve the dimming efficiency of the loads.

The invention provides a method and system for determining the maximum brightness of a super-three-color LED light source matching target chromaticity, solves a problem that a target chromaticity is matched through the super-three-color LED light source under the condition that the target light color brightness is not given, determines the maximum brightness which can be achieved by the super-three-color LED light source when the target chromaticity is matched, further solves a problem that a light mixing equation does not have a unique solution when the target light color brightness and the chromaticity are given, and can avoid a problem that the given target light color brightness possibly exceeds the maximum brightness which can be mixed by the light source. According to the method, anabsolute tristimulus value of each light color LED of the super-three-color LED light source at the maximum control signal value is measured only through a spectral radiometer, and then a linear programming model is constructed in combination with a target chromaticity and is solved, so the maximum brightness when the target chromaticity is matched can be determined. The method is advantaged in that the method is simple and convenient to operate, can meet the requirement of dimming by adopting a super-three-color LED light source, and can be applied to intelligent lighting and dynamic lightingsystems.

The invention relates to the technical field of laser application, particularly to an optical laser with adjustable light. The optical laser comprises a laser body and a laser seat, wherein the laser body and the laser seat are movably connected; the laser body comprises a laser head, a laser main part and a laser tail which are sequentially connected; an excitation device is arranged on the laser main part and used for generating laser light; an emission channel and light adjusting pieces are arranged on the laser head; the emission channel is communicated with the excitation device, and is used for projecting laser light generated by the excitation device to the outside; the light adjusting pieces are perpendicular to the emission channel, and are provided with light adjusting openings which are communicated with the emission channel and are used for adjusting the projected area of laser light; a power port connected with the excitation device is formed in the end part, away from the laser main part, of the laser tail; the laser seat comprises a seat body and a power line; the seat body is provided with a power connector which is matched with the power port and electrically connected with the power line and is used for connecting with an external power source; an accommodating groove is formed in the seat body; the laser tail is accommodated in the accommodating groove. According to the optical laser with adjustable light, the light adjusting process is convenient and quick, and the light adjusting efficiency is improved.

The invention relates to an LED lamp light adjusting device. The LED lamp light adjusting device includes a controller provided with a plurality of PWM outputs, a plurality of digital-to-analog converters and a plurality of LED analog drivers, wherein the PWM outputs, the digital-to-analog converters and the LED analog drivers are in one-to-one correspondence; the controller is used for outputting a plurality of paths of PWM control signals through the plurality of PWM outputs; each digital-to-analog converter is used for converting a corresponding path of PWM control signals into linear analog control signals; and each LED analog driver controls an LED lamp according to the corresponding linear analog control signals. According to the LED lamp light adjusting device of the invention, the PWM control signals are converted into the analog signals to control LED lamps, and at the same time, an advantage of high precision of a PWM dimming mode and an excellent linear effect of an analog dimming mode can be combined together; the controller is provided with the plurality of PWM output ends, so that dimming can be performed on a plurality of LED lamps simultaneously, and therefore, dimming efficiency can be improved.