67results about How to "No flickering" patented technology

The invention discloses a liquid crystal display device and a backlight control method thereof, wherein the liquid crystal display device and the backlight control method relate to the field of display technology. The liquid crystal display device and the backlight control method settle a problem of display picture flicker aware by human eyes because of brightness non-uniformity of a picture which is displayed by the liquid crystal display device caused by frequency change of a received video signal. The liquid crystal display device comprises a processor, a microcontroller and a light emitting diode control chip. The processor is electrically connected with the microcontroller. The microcontroller is electrically connected with the light emitting diode control chip. The microcontroller is configured for generating a plurality of frame synchronization signals with a first signal frequency, and the first signal frequency is a common multiple of the frequency of at least two frame rate signals with different frequencies in a plurality of frame rate signals. The light emitting diode control chip is configured for generating a plurality of PWM signals with same frequency by means of a first signal frequency. The liquid crystal display device and the backlight control method thereof are used for driving the backlight source of the liquid crystal display device to emit light.

A lighting control circuit for an illuminating lamp includes: a rectifier part that is connected to a ballast to which commercial alternating-current electric power is supplied, and converts the alternating current to direct current; a smoothing capacitor that is provided on an output side of the rectifier part, and removes an alternating-current component included in direct current outputted from the output side; a drive circuit that has a switching element, and performs on-off control on electric current flowing to a plurality of solid-state light-emitting elements connected in series to both ends of the smoothing capacitor; and an inductor that is provided in an electric power supply system between the ballast and the smoothing capacitor.

The invention discloses an intelligent LED (light-emitting diode) video synchronizing impulse stroboscopic supplemental lighting device. The device is composed of an electronic circuit and a shell, wherein the electronic circuit has the following structure: a 220V alternating current is connected with a 24V switching power supply and a synchronization generator, the 24V switching power supply is connected with an LED lamp matrix and a +12V power supply circuit, the +12V power supply circuit is connected with a +5V power supply circuit, a light ray detection circuit is connected with a signal processing circuit, a signal input circuit is connected with the signal processing circuit, the signal processing circuit is connected with a signal output circuit, and the signal output circuit is connected with the LED lamp matrix through an actuator. With the adoption of the device provided by the invention, the phenomena of dazzling, uneven exposure and streaking can be effectively avoided, the synchronous exposure with a frame of a camera and frequency multiplication output of light can be realized, and the problem that the color of the red light in an image shot by a monitoring camera changes from red to yellow during the red light signal of traffic lights is solved.

The invention discloses a video denoising method based on improved self-adaptive bilateral filter. The video denoising method includes that: 1) obtaining frames at two ends and the center of continuous N frames, and calculating a characteristic value of structure tensor of an image; 2) performing statistics on proportion of edge areas in the image and gradient distribution of the edges; 3) calculating gray average of pixels according to the direction of pixel structure tensor; 4) dividing an edge area and a non-edge area; 5) arranged gray variance in the edge area according to gradient size of the edges; 6) arranged large gray variance in the non-edge area; and 7) calculating the bilateral filter according to the self-adaptive gray average and the gray variance. The video denoising method based on the improved self-adaptive bilateral filter uses the front frames of a video as reference for edge statistics, reduces calculated amount, and enhances stability of the filter with the help of the characteristic that edge areas between adjacent frames are overlapped.

The invention relates to a mobile terminal as well as an apparatus and method for switching lock-screen wallpaper. The mobile terminal includes a processor, a memory and a display; the processor reads first pre-cached lock-screen wallpaper when the screen of the mobile terminal is extinguished, and generates second new lock-screen wallpaper and sends the second new lock-screen wallpaper to the memory, so that the second lock-screen wallpaper to be read can exist in the memory when the screen is extinguished next time; the memory caches lock-screen wallpaper; and the display displays lock-screen wallpaper which has been read when the screen of the mobile terminal is lit. With the apparatus and method for switching the lock-screen wallpaper provided by the invention adopted, the lock-screen wallpaper can be fast switched when the screen is lit or extinguished fast and frequently, and picture flicker can be avoided. Since the wallpaper of a lock-screen pictorial needs a certain time to be loaded when being switched, if a user fast turns on and turns off a screen, picture flicker in wallpaper switching can be brought about, and as a result, the problem of poor user experience can be brought about, while, with the apparatus and method adopted, the problem can be solved.

The present invention provides a plasma display panel and a method for driving the plasma display panel each of which ensures to suppress problems associated with an erroneous discharge resulting from accidental occurrence of a strong discharge in a reset period as well as with an address discharge delay. The problems are suppressed without applying an auxiliary erase pulse after the reset period ends. As a result, image display is provided with no flickering and good quality. The reset period includes a first step of applying a voltage having an ascending ramp waveform and a second step of applying a voltage having a descending ramp waveform. Between the first and second steps, a potential change waveform having a rise or fall (voltage change pulse) is applied at least to scan electrodes, sustain electrodes, or address electrodes.

The invention relates to a power supply device used for LED dimming, which is characterized by comprising a SCR dimmer and a power supply serial connected with the SCR dimmer. The power supply comprises an input safety device and a rectifier both of which are used for converting the voltage changed by the SCR dimmer into DC voltage. The high-voltage end after rectification is connected with the collector of a switch triode through a primary transformer. The emitter of the switch triode is connected with a power restriction resistance and a negative feedback system. The base of the switch triode is connected with two starting resistances and a positive feedback system. The primary transformer is sequentially connected with a secondary transformer, a secondary waves filtering rectifier and an LED load. The invention can adjust the brightness of the LED by the SCR dimmer and solve the technical problem that the LED driving power in prior art can not adjust light by the SCR dimmer. So, people can adjust the brightness of the LED lamp freely according to needs. Thereby, the invention not only facilitates the life of people but also saves energy.

The invention discloses a startup method. The startup method comprises the following steps: starting a bootstrap program, wherein the bootstrap program comprises relevant operation for loading and starting a loading object of electronic equipment; reading a target resolution; displaying a screen picture corresponding to an executing process of the bootstrap program with the read target resolution; loading and starting the loading object of the electronic equipment; and continuously displaying a screen picture corresponding to a loading and starting process of the loading object at the target resolution. According to the startup method, in a set-top box starting process, screen pictures in starting processes of a bootstrap program and an application program of the set-top box can adopt a resolution set by a user, and when the application program is started at the very beginning, the screen picture is continuously displayed at the resolution set by the user and display output is not closed, so that a television is not flickered in a set-top box starting process; therefore, a coherent picture and a user-friendly interactive style are provided for the user.

The invention discloses a starting method of a camera. The starting method of the camera comprises the following steps that when a camera starting instruction is detected, a mobile terminal acquires current ambient brightness; according to the current ambient brightness, initial exposure time is set; and based on the set initial exposure time, the camera is started. The invention also discloses a mobile terminal. Because the initial exposure time used by the camera at a starting moment is set based on the current ambient brightness, which means that the initial exposure time adapts to the current ambient brightness, a flicker phenomenon is not generated when the camera uses the initial exposure time at the starting moment and a usage experience is improved.

The invention discloses a Web end long list rendering method. The method comprises the steps of performing page layout, wherein a fixed length list is set in a root node; setting a data array needingto be rendered by a user, the height of a view and a rendering function needed for rendering data, and the height of the whole page is calculated according to the length of the transmitted data arrayand the height of each rendered datum in the DOM node; calculating the minimum number of data required by each page of content in the fixed length list; respectively adding a head monitoring node anda tail monitoring node in front of and behind the fixed length list; secondly, adding a monitoring event to the head monitoring node and the tail monitoring node by using an Intersection Observer object, starting to pull down to update data when the head monitoring element monitoring event is triggered, and on the contrary, starting to slide up to update data when the tail monitoring element monitoring event is triggered; according to the method, a new rolling monitoring method and a DOM operation algorithm are used for optimizing the problem of long list loading lag.

A lighting control circuit for an illuminating lamp includes: a rectifier part that is connected to a ballast to which commercial alternating-current electric power is supplied, and converts the alternating current to direct current; a smoothing capacitor that is provided on an output side of the rectifier part, and removes an alternating-current component included in direct current outputted from the output side; a drive circuit that has a switching element, and performs on-off control on electric current flowing to a plurality of solid-state light-emitting elements connected in series to both ends of the smoothing capacitor; and an inductor that is provided in an electric power supply system between the ballast and the smoothing capacitor.

The invention relates to the technical field of LED drive circuits, in particular to a linear LED drive circuit for silicon controlled dimming. The technical problems that in the prior art, when overshoot flicker at the turn-on moment is achieved and critical voltage is reached, channels are switched repeatedly to cause switch flicker are solved. The linear LED drive circuit mainly comprises a power source, a silicon controlled switching circuit, a rectifier bridge, an integral circuit and a drive circuit, wherein a silicon controlled drive power circuit is formed by the power source, the silicon controlled switching circuit and the rectifier bridge; the integral circuit comprises a power source potential point and a sampling potential point, wherein the voltage values of the power source potential point and the sampling potential point are reduced in sequence, and the output end of the rectifier bridge is connected to the power source potential point; the drive circuit comprises a switch control and processing circuit, and the switch control and processing circuit controls a first switch transistor of a drive circuit discharge channel and a second switch transistor of a drive circuit LED channel to be connected or disconnected through voltage of the sampling potential point; the switch control and processing circuit comprises a hysteresis comparator and an LED lamp, the input end of the hysteresis comparator is connected to the sampling potential point, and the maximum potential point of the LED lamp is connected with the output end of the rectifier bridge. The invention is used for designing the LED drive circuit.

The invention provides an LED guardrail tube control circuit and device. According to the circuit, at least two groups of LED lighting circuits are connected with a control chip; the control chip receives various groups of control signals, which are transmitted by a control signal input end and used for controlling the LED lighting circuits connected with the control chip, and transmits the various groups of control signals to the LED lighting circuits when receiving a trigger signal transmitted by the control signal input end, so that the LED lighting circuit can turn on or off the LED lamps in the LED lighting circuits according to the control signals. The LED guardrail control circuit can control multiple groups of LED lighting circuits simultaneously; under the condition of a constant number of LED lamps, can reduce the number of cascade connection correspondingly and shorten the control signal conveying time correspondingly, namely, control the control signal conveying time to be shorter than the data delay time of the control chip; can avoid LED lamp flickering, enhance the lighting effects and improve the stability; can prolong the service life of the LED lamps.

The invention provides a page access control method and device and electronic equipment, and the method comprises the steps: receiving request information of a user, wherein the request information comprises target page information and user identity information; returning an access control page to the user; and executing a script program of the access control page to judge the access permission ofthe current user to the target page according to the user identity information and the target page information, and controlling the access of the current user to the target page according to a judgment result of the access permission. According to the page access control method, the security of page access control is improved, and abnormal access by a user is limited; and a splash screen phenomenon does not occur during page jumping, so that the user experience is improved.

An intelligent TRIAC dimmer includes an RF receiving circuit for receiving an external control command; a phase cutting circuit for a phase cutting power line; a control chip for driving a phase-cutting circuit to perform phase-cutting according to an external control command; a Zero-crossing detection circuit for zero-crossing detection; an overcurrent detection circuit for overcurrent detection;and a power supply circuit; The RF receiving circuit signal input terminal receives the external command signal, and the signal output terminal transmits the received external control command to thecontrol chip. The power input terminal L is connected with the control chip through a zero-crossing detection circuit, and the power input terminal L is connected with the control chip through a phasecutting circuit. A load output terminal is connected with that control chip through a zero-crossing detection circuit, and a load output terminal is connected with the control chip through a phase cut circuit. The invention adopts two-wire power fetching, so that the phenomenon of LED lamp flickering does not occur; With the addition of WIFI module, the wireless dimming function can be realized,and the user can control it remotely, which makes it more flexible and convenient to use.

The invention discloses a 3D printing system for dynamic imaging and a printing method thereof and belongs to the technical field of 3D printing. The printing method comprises the following steps of taking a spatial light modulator as a dynamic pattern generation apparatus; carrying out beam collimation and shaping by an exposure light source through an illuminating system; radiating the surface of the spatial light modulator to radiate the dynamic pattern on the surface of the spatial light modulator to the surface of a two-dimensional displacement platform through a projecting exposure objective; matching continuous loading of the dynamic pattern and scanning movement of the two-dimensional displacement platform synchronously; and further controlling the position of a focal face of a projecting lens for scan exposure layer by layer to achieve high precision, large area and dynamic imaging 3D printing. The system solves the problem that high precision and large area cannot be considered at the same time in a conventional 3D printing process, achieves joint-free high precision 3D printing of a meter-scale structure, and can be widely applied to various industrial manufacturing demands.

The invention relates to a method for drying a PTT slice of a PTT / PET composite full-tension low-elasticity interlaced yarn. The invention is characterized in that the PTT slice is dried by the following steps of: 1) sorting: the PTT slice is fed, in order, through a storage hopper, an oscillating screen, a pulse generator and another storage hopper; 2) pre-crystallization: the PTT slice is fed, in order, through a shaking feeder, a fluidized bed and a drying tower, and then kept in a fluidized bed pre-crystallizer for 5-15 minutes to allow the pre-crystallization to be finished; 3) drying: the PTT slice is dried with high-temperature dried air for 4-6 hours until the water content of the uniformly-crystallized PTT slice meets the standard. The inventive drying method ensures the uniform crystallization and normal color shade of the PTT dried slice and avoids the yellowing and deterioration problems. The water content of the slice is below 50ppm, which meets the technological requirements for drying PTT-POY pre-oriented yarns as well as PET composite spinning. The spinning of PTT dried slice is stable without filament drift.

The invention provides a single-live line on-state power taking circuit, and belongs to the technical field of electronics. By the single-live line on-state power taking circuit, the problem of low reliability of a circuit in the prior art is solved. The single-live line on-state power taking circuit comprises a comparison chip and a power taking module, a voltage stabilization module, a signal output module, a switch module, a power taking detection module and a power taking reference voltage module which are connected with the comparison chip, wherein the switch module is also connected with the power taking module, the voltage stabilization module is also connected with the power taking reference voltage module, the power taking module is also connected with an input end of the voltage stabilization module and the power taking detection module and comprises an electrolytic capacitor C1, the power taking detection module comprises a voltage stabilization diode ZD1, and the power taking module is connected with a negative electrode of the voltage stabilization diode ZD1 of the power taking detection module through a positive electrode of the electrolytic capacitor C1 and is connected with the input end of the voltage stabilization module though the positive electrode of the electrolytic capacitor C1. By the power taking circuit, the working current under a condition of static power taking can be reduced, and the application performance of a load is improved.

The invention discloses an anti-flicker panel switch with single fire line, comprising an LED (light-emitting diode) lamp, a control module and a power supply interface, wherein the control module is coupled with the LED lamp; the power supply interface is used for outputting supply current required for the LED lamp; the control module is coupled with a power supply circuit; the power supply circuit comprises an electric-chemical capacitor for providing working current required for the control module. A super-capacitor (electric-chemical capacitor) is accessed to a traditional panel switch with single fire line, and the panel switch has the short charging and discharging time and long cycle life; besides because the panel switch is powered by the super-capacitor, no excessive current passes through the LED lamp and the flicker phenomenon does not occur.

The invention discloses a ripple wave removing circuit, a ripple wave removing method and an LED circuit employing same. Power end voltage signals of an adjustment transistor which is connected with a load in series are controlled via an adjustment transistor control circuit, the power end voltage signals of the adjustment transistor are enabled to be voltage signals having ripple waves, and therefore input voltage signals input into an LED load can be direct current voltage signals without ripple waves, and therefore LED load flickering phenomena can be eliminated.

The invention discloses a wireless network and touch-control control-based back edge modulation dimming switch. The wireless network and touch-control control-based back edge modulation dimming switch comprises a touch operation panel, a capacitance induction touch sensing module, a pre-embedded box, a dimmer and a wireless network controller; the periphery of the touch operation panel is connected with the pre-embedded box, such that a structure with a cavity arranged inside can be formed; the capacitance induction touch sensing module is arranged at the back surface of the touch operation panel and is connected with the touch operation panel in a closely-fitting manner; the capacitance induction touch sensing module is further connected with the dimmer and the wireless network controller respectively; the dimmer and the wireless network controller are both arranged in the pre-embedded box; the dimmer comprises a back edge dimming circuit arranged inside; and the wireless network controller comprises a Zigbee module. With the wireless network and touch-control control-based back edge modulation dimming switch adopted, the service life of the dimming switch can be prolonged, and remote control can be realized conveniently, impact on a power grid can be reduced, and flicker phenomenon of a silicon controlled rectifier dimming circuit under a small-current working condition can be avoided. The wireless network and touch-control control-based back edge modulation dimming switch is suitable for being applied to the LED lamp control field.

The invention provides a control method used for the no-flash starting of a high-intensity gas discharge lamp. Before the ignition starting is carried out on the high-intensity gas discharge lamp, the current of the lamp is first controlled to be constant and the value of the current is led to be higher than the rated current. The voltage of the lamp is subsequently judged; when the stable voltage in the pre-heating stage of the lamp is reached, the current of the lamp is continuously reduced, thus gradually increasing the voltage and power of the high-intensity gas discharge lamp; when the current of the lamp is reduced to the rated current of the high-intensity gas discharge lamp, the current of the lamp is controlled to be reduced or increased continuously; meanwhile, the voltage of the lamp is sampled continuously; when the voltage of the high-intensity gas discharge lamp is sampled to approach or reach the rated voltage of the lamp, the lamp enters to normal work with constant power. The invention controls the whole starting process of the lamp by controlling the current of the lamp and gives out corresponding control signals in different stages, thus leading to no flash of the high-intensity gas discharge lamp, smooth change of colour temperature, extended colour change and natural power transition; furthermore, the service life of the high-intensity gas discharge lamp is increased.

Photoluminescent carbon nanoparticles and a method of preparing the same are described herein. A method of preparing photoluminescent carbon nanoparticles includes obtaining carbon nanodots, and treating the carbon nanodots with plasma.

The invention belongs to the technical field of cutting equipment and particularly relates to cutting equipment for automatically adsorbing harmful particles based on environmental protection. A supporting base is fixedly connected to the surface of a workbench, thread columns are rotatably connected to the left and right sides of the supporting base, and a rotation rod is rotatably connected to one end of each thread column. A thread sleeve sleeves the outer surface of each thread column, a V-shaped plate is movably connected to the outer surface of each thread sleeve, an annular base is movably connected to the inner side of each V-shaped plate, of the upper surface of the workbench, an electric conduction plate is arranged in each annular base, and an indicator light is fixedly connected to the outer surface of each annular base. During use, some sweeps generated during a cutting process can be adsorbed and prevented from directly scattering to the atmosphere, the cutting equipmenthas a certain environmental protection effect, when retractable columns are pressed, compression bodies can be driven to be compressed, a spraying solution in the compression bodies can be sprayed tothe surface of a workpiece so as to cool the workpiece, and the effect of cutting the workpiece is greatly improved.

The invention discloses a adjusting method for automatic exposure and automatic gain, which includes the following steps: (1) dividing an input image into N*N sub-areas and calculating the average imaging brightness of each area; (2) obtaining the actual brightness of each area; (3) calculating the optimal exposure time of the area; (4) obtaining the optimal exposure time; (5) pre-detecting the imaging brightness value of each area under the exposure time; (6) calculating the optimal gain value; (7) setting the imaging time and gain of an imaging sensor, shooting the image of next frame and repeating the steps until target exposure brightness is achieved. An adjusting device for applying the method for automatic exposure and automatic gain includes an imaging sensor, an image processing module, an automatic exposure calculating module, an automatic gain calculating module and an imaging control module. The invention can rapidly adjust the exposure time and the gain value.

The invention discloses an LED lamp based ambient light induction controller which comprises a microcontroller, a voltage stabilizing circuit and an illumination detection circuit. The voltage stabilizing circuit is connected with an LED driving circuit and provides a working voltage for the microcontroller and the illumination detection circuit; the microcontroller is provided with a PWM module, and is connected and drives a lamp control switch via the PWM port, the light control switch is connected with an LED lamp, and the microcontroller controls the PWM output frequency to control the light emitting frequency of the LED lamp; and at the same time, the microcontroller converts an illumination change value detected by the illumination detection circuit into an electric signal, compares the electric signal with a preset voltage value, and controls switching and brightness of the LED via the PWM port according to a comparison result. Thus, the lamp is controlled automatically according to ambient light change, and a lot of labor and energy are saved; and the light induction controller can be installed in any part of the lamp, and the product experience is extremely good.

The invention relates to an LED (Light Emitting Diode) spotlight circuit compatible with an electronic transformer. The LED spotlight circuit comprises a high frequency electronic transformer circuit, a rectification and filter circuit, a voltage boost circuit, a voltage reduction and constant current circuit and an LED module, wherein the voltage boost circuit comprises an integrated circuit U1, an electrolytic capacitor C11, a triode Q2, a diode D4, a diode D5, an inductor L3, a resistor R4, a high frequency switching tube Q3, a biasing resistor R13, a resistor R14 and an electrolytic capacitor C3; the positive electrode of the diode D5 and the collector electrode of the high frequency switching tube Q3 are both connected with the other end of the inductor L3; the positive electrode of the diode D4 and the positive electrode of the electrolytic capacitor C3 are both connected with the negative electrode of the diode D5; one end of the resistor R4, the collector electrode of the triode Q2 are both connected with the negative electrode of the diode D4; and the positive electrode of the electrolytic capacitor C11, a 6th pin of the integrated circuit U1 and one end of the biasing resistor R13 are both connected with the emitter electrode of the triode Q2. The LED spotlight circuit provided by the invention is compatible with the electronic transformer.

The invention discloses a street lamp dimming system directly using power lines to transmit signals. The street lamp sends a dimming control signal; wherein, the centralized street lamp controller includes a first power supply module, a power line signal sending module, a main control module, an electric meter module, a key module, a display module and a remote data communication module. By adopting the technical scheme of the present invention, a simple circuit structure is used to directly transmit the dimming control signal of the street lamp through the power line; at the same time, only one cycle of the AC signal of the power line is needed to realize the transmission of the dimming control signal, which greatly guarantees the power grid Stable; further, the dimming control signal at least retains a complete half-wave of a single cycle AC signal as energy supply, even if the conduction angle is very small, there will be no flickering phenomenon during the dimming process.

The invention discloses a key update method, apparatus and system based on an OTN. The method comprises when an encryption end detects that local configuration information is valid, detecting validity of decryption end readiness information received via a pre-set receiving overhead channel within a pre-set period of time; after determining that the decryption end readiness information is valid within the pre-set period of time, sending key update information about a local end to the decryption end via a pre-set sending overhead channel when a next pre-set cycle meets a pre-set condition; and when the next pre-set cycle, after the encryption end sends the key update information to the decryption end, meets the pre-set condition, encrypting service information sent to the decryption end by means of an updated key. By means of the technical solution, while ensuring the consistency of keys of an encryption end and a decryption end, it is also ensured that an intermittent service interruption does not occur and a service of an OTN device is not affected in a process of replacing new and old keys.

The invention discloses a method and device for determining the depth of an object in a three-dimensional scene, a terminal and a storage medium. The method comprises the steps of obtaining the distance between a target object in the three-dimensional scene and a virtual camera; detecting whether the three-dimensional scene is a close-range display scene or a long-range display scene; when the three-dimensional scene is a close-range display scene, calculating a depth value of the target object by utilizing the distance and a preset first preset minimum observation distance and a preset firstpreset maximum observation distance of a virtual camera; and when the three-dimensional scene is a distant view display scene, obtaining the height from the virtual camera to the ground, determining the current minimum observation distance and the current maximum observation distance of the virtual camera based on the height, and calculating the depth value of the target object by combining the distances, the current minimum observation distance and the current maximum observation distance. By means of the mode, the precision of the depth buffer area of the overlapped image area in the three-dimensional display scene can be improved, and the problem that images flicker in the overlapped area is avoided.