67results about How to "No flickering" patented technology

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 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 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 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 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 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.