7results about How to "High dimming accuracy" patented technology

The invention discloses a high-power LED lamp bead self-adaptive dimming method and system based on intelligent driving, and belongs to the technical field of illumination control, and the method comprises the steps: collecting a mode switching threshold value and factor data influencing the mode switching threshold value, and constructing a historical data set and a prediction model; periodically collecting and constructing a real-time data set; calculating according to the real-time data set to obtain a current state value; inputting the real-time data set into the prediction model to obtain a current switching threshold value; switching the current dimming mode according to the size relationship between the current state value and the current mode switching threshold value; and generating a corresponding control signal according to the current dimming mode, and sending the control signal to an LED driving circuit, thereby controlling an LED lamp bead. The mode switching threshold is predicted by adopting the neural network model, and the dimming mode is switched according to the size relationship between the current state value and the current mode switching threshold, so that the adaptive dimming of the high-power LED lamp bead can be realized, the dimming range and precision are improved, and the brightness is adaptively adjusted according to the environmental change.

The utility model relates to the technical field of electronic circuits, in particular to an LED (light-emitting diode) dimming drive circuit, which comprises an ACDC (alternating current-direct current) constant voltage module, an LED dimming drive module and a control module, the voltage reduction and stabilization power supply module reduces and stabilizes the voltage to 5V / 3.3 V and outputs the voltage; a Bluetooth module; the MCU dimming control module is used for mixing and processing the Bluetooth dimming control signal and the knob dimming control signal and then outputting two paths of PWM1 and PWM2 dimming signals of which the sum is 100%; the analog and PWM dimming conversion module is used for correspondingly dimming by using analog voltage or PWM when the LED is in high brightness or low brightness; and the DCDC constant current module is used for stably outputting the current transmitted by the ACDC constant voltage module according to the signal transmitted by the analog and PWM dimming conversion module. According to the utility model, various fixed-point illumination settings with different maximum current brightness can be realized under the condition of one lamp, the production cost is effectively reduced, and the dimming effect is good.

Disclosed are a display panel driving method and a display device. The display device performs dimming according to the display panel driving method. When the display grayscale is lower than a set threshold, the first driving signal is adjusted to a second driving signal to provide the amplitude of the driving current, improve the anti-interference ability of the driving current, and reduce the pulse frequency of the driving current to ensure that the power output of the driving current to the light-emitting drive remains basically unchanged, and the display brightness remains basically unchanged. The display panel driving method and the display device of the present invention effectively improve the anti-interference ability of the driving current during low grayscale display and improve the dimming accuracy.

The invention discloses a hybrid dimming system of a light emitting diode, which relates to the technical field of dimming of the light emitting diode and comprises a mode conversion module, a current reference module, a PWM (Pulse Width Modulation) processing module and a current driving module, the mode conversion module is mainly responsible for processing structure switching of index dimming and linear dimming, I2C dimming codes are input through the mode conversion module, high-precision LED current driving is achieved through PTAT current or CTAT current generated by the current reference module in combination with a feedback loop formed by a precise resistor and an operational amplifier, and particularly, the current conversion module can be used for driving an LED light source in a high-precision mode. In the zero-temperature-drift LED current driving realized in a simulation mode, the system adopts a zero-temperature-drift current source, the influence of temperature change on the LED current is effectively counteracted, the stability and the consistency of the LED current are ensured, the stability and the reliability of LED light emitting are improved, the service life of the LED is prolonged, and the cost is reduced. And the light attenuation and failure risks caused by current fluctuation are reduced.

The application relates to a multi-channel LED dimming centralized independent control device, which comprises an LED1, an LED2, a centralized independent control module and the like; a dimming input voltage Vin is connected with the anode of the LED1 and the LED2, the first end of capacitors C1-C2 and the cathode of voltage stabilizing tubes D1-D2; the second end of the capacitor C1 is connected with the cathode of the LED1 and the first end of an inductor L1, the second end of the inductor L1 is connected with the anode of the voltage stabilizing tube D1 and the first pole of a switch tube SW1, the second pole of the switch tube SW1 is connected with the first end of a resistor R1 and the first input end of the centralized independent control module, and the control pole of the switch tube SW1 is connected with the first output end of the centralized independent control module; the centralized independent control module can realize centralized dimming control for the LED1 and the LED2.

The present invention discloses an LED dimming circuit, an LED driving system and an electronic device. The dimming input voltage is judged by a first comparison module and a second comparison module, and a suitable signal output is selected by a selection module according to the judgment result. When the dimming input voltage is lower than the first threshold voltage, a relatively accurate dimming signal can be output through a voltage divider module, thereby avoiding the problem that the current flowing through the LED is not accurate when the input voltage Vref_Dim is low due to the existence of the offset voltage Vos of the operational amplifier of the existing LED dimming circuit and the LED lamp brightness cannot meet the index requirements of the dimming accuracy. The technical solution of the present invention can improve the LED dimming accuracy and meet the demand for high-precision dimming.

The utility model relates to the technical field of radio-frequency laser dimming, in particular to a radio-frequency laser fixing and dimming device, which comprises a fixing part, a light-emitting part, a light-emitting part, a light-emitting part, a light-emitting part, a light-emitting part and a light-emitting part, and the dimming part is arranged at one end of the fixing part, and the dimming part is used for adjusting the direction of the radio frequency laser emitted by the laser. According to the utility model, accurate adjustment can be carried out in four directions, so as to meet the dimming requirements of different lasers, improve the dimming precision, simplify the dimming process and improve the working efficiency. The structure is simple, operation is simple and easy to operate. A fixed structure is adopted, the laser does not need to be moved, space and time are saved, adjusting precision is high, and the dimming requirement of the laser can be met.