39results about How to "Realize brightness adjustment" patented technology

The invention discloses a variable frequency constant-current control method for an LED drive system based on a switched capacitor converter, and the method comprises the steps: taking a current Ich of a capacitor CS of the LED drive system based on the switched capacitor converter in a charging circuit as an integration input quantity, and inputting the integration input quantity into a resettable integrator; feeding back a given output current reference quantity Iref of the LED drive system based on the switched capacitor converter in the charging circuit and the whole output current Io of the LED drive system based on the switched capacitor converter to an adder-subtractor for difference solving; enabling an output signal of the adder-subtractor and an output signal of the resettable integrator to be transmitted to a comparator for comparison, and then transmitting the output signals to a D trigger, and then to a monostable multi-harmonic oscillator; enabling a signal outputted by the monostable multi-harmonic oscillator to pass through an output drive signal amplification circuit for driving a switching tube S1 and a switching tube S2 to operate, thereby achieving the constant-current output purpose and increasing the dynamic response speed of the LED drive system based on the switched capacitor converter.

The invention discloses a finger veil image acquisition system, and belongs to the technical field of human body biological recognition. The system comprises a controller, an infrared camera, a commoncamera, a light filter and an infrared source array, wherein the light filter respectively separates the infrared camera and the common camera from the infrared source array; a touch capacitor is arranged at one end of the light filter; the touch capacitor is connected with the connector; both the infrared camera and the common camera are connected with the controller through a camera driving circuit; the controller is connected with the infrared source array through a potentiometer array; a lens is arranged between the light filter and the infrared source array; and the touch capacitor is used for determining a putting position of fingers. According to the system, finger veins are irradiated through the infrared camera and the infrared source array, so that the problems that the image uniformity is relatively bad, the illumination intensity is not enough and the fingers cannot be completely covered as common cameras and white light LEDs are used as light sources in the prior art areeffectively solved.

The invention provides a high-efficiency intelligent current-adjusting brightness-adjusting LED indoor and outdoor illumination system. The high-efficiency intelligent current-adjusting brightness-adjusting LED indoor and outdoor illumination system comprises a voltage-stabilized power supply, several LED lamps, a light-adjusting module, a controller, a signal transmission line and a hand-held mobile terminal; after being grouped and connected in parallel, the LED lamps are connected to the voltage-stabilized power supply; the number of the LED lamps connected in parallel in each group is at least two; the light-adjusting module is connected in a connection line of each group of LED lamps and the voltage-stabilized power supply in series; a coding line used for addressing each group of LEDlamps is connected onto the controller; a comparison table of the numbers and the brightness of each group of LED lamps is stored in the controller; two ends of the signal transmission line are separately connected to signal transmission ports of the controller and the light-adjusting module; and the hand-held mobile terminal is used for acquiring visible light emitted by the LED lamps, and performing wireless communication with the controller. By means of the high-efficiency intelligent current-adjusting brightness-adjusting LED indoor and outdoor illumination system provided by the invention, current adjusting and brightness adjusting on the LED lamp groups in corresponding areas can be realized at any time and in any place; and the adjusting mode is convenient, intelligent and effective.

The invention relates to a key control system of a Doppler ultrasonic diagnosis instrument. The key control system is connected with a color ultrasonograph host computer, and comprises a single-chip computer control module, a key module, a TGC (time grain compensation) module, a light-emitting diode (LED) display module and a sound generating module. The key control system has the characteristics that: an LED intelligent display chip is used for controlling the display of a backlight lamp, therefore the overall brightness adjustment of the backlight lamp can be realized and on / off of each LED can be controlled separately; single-chip computer control is adopted to achieve the synchronization technology of the state indication lamp in the key and the host computer state, and working mode and adjusting mode indication lamps are used to achieve better human-computer interaction; and by adopting PS / 2 interface to connect with a computer, the external connection of other keys are avoided in the setting process of basic input output system (BIOS), and the installation and maintenance become more convenient and rapider.

The invention discloses a time division multiplexing LED dimming device, circuit and dimming method, the dimming circuit comprises a control module, a voltage generation module, multiple paths of maintenance module and a light emitting module, and the light emitting module comprises a plurality of LED lamp strings and a constant current source unit; the control module converts the multiple paths of dimming data into voltage selection signals according to a preset period and outputs the voltage selection signals to the voltage generation module, so that the voltage generation module selects dimming voltage and outputs the dimming voltage to the multiple paths of maintaining modules; the control module further outputs multiple paths of control signals corresponding to the dimming voltage tothe multiple paths of maintenance modules according to a preset period; and the multiple paths of the maintenance modules select a conductive path according to the control signals to output the dimming voltage to the corresponding constant current source unit to control the brightness of each LED lamp string, so that the brightness adjustment of the multi-path LED lamp strings is realized througha simple circuit structure, and the problems of sudden current change, conduction radiation and stroboflash are also avoided.

The invention discloses a special LED lighting device for animal experiments, which comprises an LED lighting system, an animal hair and dust collection system and an intelligent control system, wherein the animal hair and dust collection system is connected with the LED lighting system; the intelligent control system is connected with the LED lighting system and the animal hair and dust collection system respectively; the animal hair and dust collection system comprises a motor, wind wheels, an upper cover, a wind scooper, an air filter element, a lower cover, an air filter element fixing screw rod, upper cover wind outlets and HEPA filter bags; animal hairs and large-particle dust in air are filtered and collected by the air filter element, and small-particle dust in air is filtered and collected by the HEPA filter bags. The special LED lighting device is reasonable in design and simple to maintain, can provide a lighting system with high efficiency, low energy, uniform illumination and good light quality for animal experiments, and meanwhile, can effectively clean air, improve the working environment, remarkably improve the stability and prolong the service lives of instruments and equipment.

The technical purpose of the invention is to provide a PWM remote controller used for controlling two-color output. The PWM remote controller used for controlling two-color output simplifies the key arrangement of a control panel of the remote controller, controls two-color output of the single-channel controlled remote controller, and uses the single-channel remote controller. The PWM remote controller used for controlling two-color output comprises a control circuit. The control circuit is connected with keys of the control panel. The keys of the control panel comprise a switch key, a mode key and a brightness key. According to the invention, after the mode key changes a mode, the brightness key is used to realize cycle control; brightness operation of different modes can be realized; and the PWM remote controller can be used as the remote controller of a lamp.

The invention discloses an endoscope camera and a self-adaptive dynamic imaging method thereof. The self-adaptive dynamic imaging method comprises the following steps: continuously carrying out multi-region sampling on the brightness of an optical signal acquired by a sensing array of the endoscope camera; performing weighted calculation according to the sampling value of each sampling area to obtain a weighted photometric value corresponding to the whole sensing array; and adjusting an exposure parameter according to the weighted photometric value, so that the obtained image brightness is stabilized within a preset brightness value range. According to the method, the dynamic imaging effect of the endoscope camera can be improved.

The invention discloses a synchronous shutdown LED boost driving circuit comprising an inductor, a synchronous shutdown module, a boost driving circuit, and a dimming circuit. When the boost driving circuit is not started, the inductor stores energy, the synchronous shutdown module is in an open state, and a loop is open. When the boost driving circuit is started, the inductor discharges electricity, the synchronous shutdown module is in a closed state, the loop is closed, and an LED light source is energized and lighted up. Based on dimming signals output by the dimming circuit, the boost driving circuit outputs different voltage signals, the magnitude of current on a main loop is changed, and the brightness of the LED light source is changed. The energy storage period and the discharge period of the inductor are separated by the synchronous shutdown module. In the energy storage period of the inductor, the inductor does not discharge electricity to a load at all. Thus, the energy utilization rate of the circuit is increased, and the energy of the inductor is not reduced in the discharge period. Adjustment of the brightness of the LED light source is realized, and the scope of application of the LED light source is expanded. The synchronous shutdown LED boost driving circuit is convenient and practical.

The invention discloses an LED power supply circuit. The LED power supply circuit comprises an LED light bar; an LED driving control chip which is electrically connected with the LED light bar and is used for adjusting the brightness of the LED light bar; an alternating current-direct current conversion circuit module which comprises a conversion circuit, wherein the conversion circuit is electrically connected with the LED light bar and used for converting commercial alternating current into direct current to serve as input voltage of the LED light bar; wherein the alternating current-direct current conversion circuit module further comprises a TL431 circuit, the LED driving control chip is electrically connected with the TL431 circuit, and the LED driving control chip outputs a first voltage to the TL431 circuit so as to adjust the magnitude of the input voltage of the LED light bar. According to the LED power supply circuit, the brightness adjustment of the LED can be realized only through two circuit modules, namely the alternating current-direct current conversion circuit and the LED driving chip. A plurality of groups of direct current-direct current conversion circuits are omitted, the internal circuit space occupied by the LED brightness adjusting circuit is reduced, and the cost is reduced.

The invention relates to the technical field of direct-current power supply lighting, in particular to a direct-current power supply lighting dimming module, which comprises a direct-current input module, a power electronic coupling conversion module, a power coupling signal output module, a signal input module and a power signal coupling driving module. The power electronic coupling conversion module is electrically connected with the direct current input module, the power coupling signal output module and the power signal coupling driving module, and the signal input module is electrically connected with the power signal coupling driving module. After the direct current is inputted to the dimming, a power coupling signal with a coupling signal is obtained through conversion through the power electronic coupling conversion module, and is output to a lamp through the power coupling signal output module; a dimming signal is recognized and converted into a driving signal through the power signal coupling driving module, and the power electronic coupling conversion module sends out a low-frequency high voltage and a low voltage with the amplitude of + / - 5V, so that the brightness of alamp of a certain loop of the direct-current lighting power supply system is adjusted.

Embodiments of the present invention provide a display device and a control method, in the field of display technology, which can solve the limitation in the prior art that the brightness of the display screen can only be adjusted by compensating the threshold voltage; the display device includes: a processor, a timing controller, Data driving circuit; each sub-pixel is correspondingly provided with a photosensitive module, and the photosensitive module is at least partly facing the sub-pixel, so as to detect the actual brightness value of each sub-pixel through the photosensitive module; the processor is used to input multiple settings according to the sub-pixel The actual luminance value and the target luminance value of the given display data to obtain the sub-pixel compensation mapping relationship; the compensation mapping relationship is the corresponding relationship between each first display data and the second display data within the value range of the sub-pixel display data, The second display data is obtained by compensating the first display data; the timing controller is used to output the second display data obtained according to the compensation mapping relationship to the data driving circuit, so as to apply corresponding pixel voltages to the sub-pixels.

The invention discloses a method for controlling distributed lighting in an open office. The open office includes N LED lamps with adjustable brightness, which are respectively arranged on M workbenches to set the expected illuminance of the workbench. The sensor-actuator node is used to detect the illuminance of LED lights and control and adjust the brightness of LED lights in one-to-one correspondence. In the present invention, N sensors are used to obtain the expected illuminance of M workbenches, and the expected illuminance of the open office is calculated based on the average consistency theory; N sensors-executors detect the illuminance information of N lamps, based on the expected illuminance and the actual illuminance The deviation among them is distributed to adjust the brightness level of N lamps. The invention provides an automatic control strategy for the illumination brightness of an open office, which can be used in existing intelligent offices to realize the adjustment of the brightness of an intelligent open office workbench according to actual needs.

The invention discloses a brightness compensation method and system for an OLED microdisplay based on temperature feedback, comprising: a temperature detection module detects and reads out the temperature of a microdisplay drive chip in real time; The function gets the corresponding V of the microdisplay at this temperature COM Pulse width; luminous time modulation module adaptively modulates V COM The voltage switching waveform changes the light-emitting time of the OLED device in one frame, thereby achieving the effect of brightness adjustment, so that the micro-display can maintain the consistency of brightness in a wide temperature range. The invention can realize N-level brightness modulation, and the method of changing the brightness of the micro-display by controlling the light-emitting time of the OLED device does not affect its gamma characteristics; Fluctuation does not flicker.

The invention provides a silicon controlled rectifier light modulation-supported AC / DC power supply circuit and a control method and a power supply method thereof. A light modulation signal generation circuit detects the DC voltage output from a rectifier circuit to generate a light modulation signal to provide a current reference signal. A current detection circuit detects a controlled current and provides a current feedback signal. A controller generates a control signal for a switch device in a current limiting-constant current circuit according to the difference between the current reference signal and the current feedback signal, so that the controlled current is enabled to change correspondingly with change in the DC voltage output from the rectifier circuit, thereby achieving silicon controlled rectifier light modulation. The power device loss is extremely low, the conversion efficiency is extremely high, and the power application range of the drive power supply can be easily expanded. The conduction angle of the rectifier bridge is increased, so that the power factor of the power supply circuit is enabled to be higher than the traditional rectifier circuit. The output voltage and the current ripple are small. The better anti-lightning stroke surge capability is achieved. The better silicon controlled rectifier light modulation compatibility is achieved. The integration is easy to implement.

The invention discloses a low-position illuminating lamp which comprises a lamp body, a control circuit, a built-in power source, a main light source, an internal light reflecting element and an external light reflecting element, the control circuit is connected with the built-in power source and the main light source, the control circuit, the built-in power source, the main light source and the internal light reflecting element are arranged in the lamp body, and the external light reflecting element is arranged outside the lamp body. The lamp body is provided with a light outlet hole used for communicating the interior of the lamp body with the exterior of the lamp body. The internal light reflecting element is arranged in the light emitting direction of the main light source, the light outlet hole and the external light reflecting element are arranged in the light emitting direction of the internal light reflecting element, and light emitted by the main light source irradiates the internal light reflecting element, penetrates through the light outlet hole after being reflected by the internal light reflecting element and irradiates the external light reflecting element, and the light is reflected by the external light reflecting element and then obliquely and downwards irradiated. A plurality of optical elements are adopted, the reflection principle is used for achieving main light illumination, glare hazards can be effectively reduced, and a healthier, safer and more comfortable illumination environment is created.

The invention discloses a point-to-point brightness control system and a method; wherein, the point-to-point brightness control system comprises a processing unit; the processing unit analyzes performance parameter consistency and obtain subject brightness range according to the performance parameter of an external display device; adjustment data are generated according to the subject brightness range and are provided to the display device; wherein, the display device is an LED display device and the performance parameter is that of each LED in the display device. The point-to-point brightness control system can adjust the brightness and color as well as the lighting angle of each LED in the display device to ensure that the display device has uniform display and good display effects.