74results about How to "Stable drive current" patented technology

The embodiment of the invention discloses a pixel driving circuit and a driving method thereof, a display panel and a display device. The pixel driving circuit comprises an initialization unit, a datawriting unit, a threshold compensation unit, a light emitting control unit, a voltage stabilizing unit, a storage capacitor, a driving transistor and a light emitting element; the initialization unitis electrically connected between the initialization signal end and the first node; the data writing unit is electrically connected between the data signal end and the first electrode of the drivingtransistor; the grid electrode of the driving transistor and the first end of the storage capacitor are electrically connected to a second node; the second end of the storage capacitor is electricallyconnected with the power signal end; the threshold compensation unit is electrically connected between the second electrode of the driving transistor and the second node; the voltage stabilizing unitis electrically connected between the first node and the second node; the light-emitting control unit is electrically connected between the power supply signal end and the light-emitting element. According to the technical method provided by the embodiment of the invention, the problem of non-uniform display caused by electric leakage can be solved, so that the display effect is improved.

The invention provides a pixel unit drive circuit for driving a light-emitting device to emit light. A grid of a first thin film transistor is connected with a scanning line, a first pole is connected with a data line and a second pole is connected with a first node. One grid of a second thin film transistor is connected with a scanning line, the other grid is connected with a second control line, a first pole is connected with a storage capacitor, and a second pole is connected with a second node. One grid of the third thin film transistor is connected with the first node, the other grid is connected with the second control line, a first pole is connected with a power supply, and a second pole is connected with the second node. One end of the storage capacitor is connected with the first node. The other end of the storage capacitor is connected the first pole of the second thin film transistor. One end of the light-emitting device is connected with the second node. The other end of the light-emitting device is grounded. Correspondingly, a pixel unit drive method, a pixel unit and a display device are provided. By the pixel unit drive circuit, influence of variation of threshold voltage on drive voltage can be reduced even eliminated.

The invention provides a pixel circuit structure and a method for driving the pixel circuit structure, which relate to the field of organic light-emitting diodes. The pixel circuit structure comprises a first switch transistor and a fourth transistor, wherein the first switch transistor is used for responding to a first control signal received by the grid of the first switch transistor, and disconnecting/connecting a first voltage signal terminal from/with the source of a drive transistor; the fourth transistor is used for responding to a second control signal received by the grid of the fourth transistor, and disconnecting/connecting the drain of the drive transistor from/with a second voltage signal terminal; when the drain and grid of the drive transistor are connected, the drain of the drive transistor and the second voltage signal terminal are disconnected, so that the drive transistor begins to discharge until the voltage between the source and grid of the drive transistor is equal to a threshold voltage. According to the embodiment of the invention, the stability of a driving current is realized, and the brightness uniformity of a panel is improved. The pixel circuit structure and method for driving the pixel circuit structure disclosed by the invention are suitable to be used in organic light-emitting diode systems.

The invention relates to a high-stability ASE light source for a high-precision fiber-optic gyroscope. The high-stability ASE light source is characterized by comprising a two-way backward light path,a Gaussian filter, a high-performance driving circuit and a power feedback control unit; the two-way backward optical path comprises a pump laser, a wavelength division multiplexer, a high-concentration erbium-doped optical fiber, an optical fiber reflector and an isolator; laser generated by the pump laser passes through the wavelength division multiplexer and then is injected into the erbium-doped optical fiber, spontaneous radiation signals are generated in the front direction and the rear direction respectively, and forward spontaneous radiation signal ASE light is amplified through the erbium-doped optical fiber after being reflected by the optical fiber reflector and overlaps with backward spontaneous radiation signal ASE light to form backward output light; the high-performance driving circuit comprises a TEC driver and a laser driver; and the power feedback control unit comprises a light splitting coupler, a photoelectric detector and a comparison circuit. The design is scientific and reasonable, the full-temperature average wavelength stability of the ASE light source is improved, and the improvement of the scale factor stability of the high-precision fiber-optic gyroscope is facilitated.

The invention discloses a novel electronic cigarette control chip. The novel electronic cigarette control chip is characterized in that a capacitance type chip head device is connected with a chip head capacitance detecting device through a constant current generation circuit and the chip head capacitance detecting device is connected with a drive and control circuit device. According to the novel electronic cigarette control chip, sensitivity and reliability of the electronic cigarette chip are effectively improved so that smog can be generated by an electronic cigarette under small sucking force and the phenomenon of smoking caused by spurious triggering is avoided. A series of problems that heat emission of the electronic cigarette is excessive, a plastic outer shell of the electronic cigarette is molten due to burning, the service life of the electronic cigarette is shortened, and a passing rate is low because of smoking operation through continuous spurious triggering for a long time of an existing electronic cigarette chip are effectively solved.

The invention discloses a drive circuit of a light-emitting diode and an illumination device. The drive circuit comprises a rectifying unit, a voltage division circuit, a control unit, a voltage converter, a resistor and a capacitor, wherein the rectifying unit rectifies an AC power supply to output a first working voltage; the voltage division circuit receives the first working voltage to generate a voltage division signal; the control unit comprises a voltage-stabilizing unit and a pulse width modulation (PWM) unit, wherein the output end of the voltage-stabilizing unit is coupled with the PWM unit, and the PWM unit outputs a PWM signal; the voltage converter regulates driving voltages and driving currents of the light-emitting diode according to the PWM signal; the resistor is coupled between the output end p of the rectifying unit and the diode; the capacitor is coupled between the power input end of the voltage-stabilizing unit and the grounding end; and the PWM unit regulates the PWM signal according to the voltage division signal and a feedback signal output by the voltage converter.

A driving circuit (20) for driving a switching element in response to an input signal Vin, wherein the driving circuit (20) is provided with a positive power supply terminal (21) fed with a positive voltage Vcc, an input terminal (22) into which an input signal Vin is inputted, a ground terminal (23) connected to the source of the switching element (2), a first output terminal (25) capable of outputting a positive voltage Vcc in response to an input signal Vin, a current source circuit (10), and a second output terminal (26) connected to the current source circuit (10). The driving circuit (20) feeds a current Ig2, in which the positive voltage Vcc outputted from the first output terminal (25) is converted by a first impedance circuit (90), and a current Ig1 outputted from the current source circuit (10) through a second output terminal (26), to a gate, and thereby drives the switching element (2).

The invention, equipment of double alterable current source driver semiconductor laser, relates to the laser used in communications which is equipment of double alterable current source driver semiconductor laser, relates to the laser in detail. For providing correct current, stable, simple structure and safe equipment of double alterable current source driver semiconductor laser, the technique scheme adapted by the invention is as follows: preliminary audion and secondary audion, the emitter of preliminary audion connects to electrical source, the emitter of secondary audion connects to collector of preliminary audion, the preliminary current source and the secondary current source connects apart to the base electrodes of preliminary audion and secondary audion through adjusting resistance. After being magnified by preliminary audion and secondary audion, the current source is outputted to the groupware of laser. The invention is available to make correct driver electricity source, stable, simple structure and safe equipment of double alterable current source driver semiconductor laser.

The invention discloses an LED. An epitaxial layer is grown on a substrate; a transparent conductive layer with variable electrical resistivity is manufactured on the epitaxial layer; a P electrode is manufactured on the transparent conductive layer; an N electrode is manufactured on the epitaxial layer; the transparent conductive layer is prepared from a conductive polymer composite material; the conductive polymer composite material comprises a polymer base material and a conductive filler at a volume ratio of 1 to 0.01-1 to 1; the polymer base material is one of epoxy resin, silica resin, polyethylene or vinylidene fluoride; and the conductive filler is one or more of carbon black, graphene, carbon nanotube, metal granules, metal fibers or metal oxide granules. The invention also discloses a manufacturing method for the LED. According to the LED, the problem that the corresponding driving current of the LED chip under a constant-voltage driving mode is increased sharply along with the increasing of temperature can be solved.

The invention discloses an LED half-bridge circuit with feedback variable-frequency constant-current driving function, comprising an input rectifying and filtering circuit, a half-bridge control circuit used for driving a chip in the chip based on one among an IR2151 drive chip, an IR2153 drive chip and an IR2155 drive chip, an isolation transformer and an output rectification filtering circuit. The LED half-bridge circuit further comprises a control chip power supply circuit for charging the electrolytic capacitor connected with the power port of the half-bridge control circuit. The input endof the control chip power supply circuit is connected with a half-bridge middle point of the half-bridge control circuit, and the output end is connected with the power end of the half-bridge controlchip. According to the invention, the structure is simple, and the output driving current is more stable. The method is suitable for driving the high-power LED.

The invention discloses a driving circuit which is used for driving an electromagnetic valve in a turbine system. The driving circuit comprises a first differential amplifier, an integrator, a second differential amplifier and a sampling resistor, wherein the input end of the integrator is connected with the output end of the first differential amplifier, the normal phase input end of the second differential amplifier is connected with the output end of the integrator, the sampling resistor is connected between the normal phase input end and the inverted phase input end of the second differential amplifier, the inverted phase input end of the second differential amplifier serves as the current output end of the driving circuit, and the output end of the second differential amplifier is connected with the inverted phase input end of the first differential amplifier. A negative feedback adjusting loop is formed by the sampling resistor and the second differential amplifier. According to the driving circuit, after gains of the second differential amplifier and the resistance valve of the sampling resistor are determined, the output current solely depends on the voltage at the normal phase input end of the first differential amplifier under the effect of a negative feedback circuit, the output driving current is stable, and requirements of the turbine system in a power plant for the driving circuit of the electromagnetic valve can be met.

The invention provides a manufacturing method of a semiconductor device. The method comprises the following steps that: a substrate is provided, wherein the substrate includes a vertical extension MOS transistor region and has a first conductive type; a leak lightly doped region is formed in the substrate of the vertical extension MOS transistor region; a gate structure is formed on the substrate and one side of the gate structure covers a portion of the leak lightly doped region; and a second conductive type ion implantation is carried out on the leak lightly doped region and the substrate by taking the gate structure as a mask layer, so that a leak heavily doped region and a source heavily doped region are formed. According to the invention, a gate structure covers a portion of a leak lightly doped region; and the gate structure is utilized as a mask layer to carry out ion implantation of a leak heavily doped region or a source heavily doped region; therefore, a distance between the leak heavily doped region and a side wall is maintained to be stable; and thus, a leak source conduction resistance value and a drive current are maintained to be stable, so that stability of a manufacturing process of a semiconductor device is improved.

The invention a brightness adjustable high-stability driving system for a blue light LED. The system is characterized by mainly comprising a control chip U1, a light adjustment control circuit, a reference correction circuit, a gradient compensation circuit, a logic buffering circuit and an overcurrent protection output voltage stabilizing circuit, wherein the light adjustment control circuit, the reference correction circuit, the gradient compensation circuit and the logic buffering circuit are connected with the control chip U1, and the overcurrent protection output voltage stabilizing circuit is connected in series between the reference correction circuit and the logic buffering circuit; and the overcurrent protection output voltage stabilizing circuit is composed of an overcurrent protection circuit whose input end is connected with the reference correction circuit and a voltage stabilizing circuit whose input end is connected with the output end of the overcurrent protection circuit. According to the system, external electromagnetic interference can be eliminated or attenuated, voltage and current are limited so that the voltage and current are kept stable, and in practical use, the anti-electromagnetic-interference capability of the high-stability driving system is 2.5 times that of a present driving system, stable driving current can be output, and it is effectively ensured that the brightness of blue light LED lamps is stable.

The invention discloses a signal amplification circuit based light-control LED (Light-Emitting Diode) energy-saving control system. The system is characterized by mainly comprising a control chip U1, a luminance sensor, a triode VT1, a voltage stabilizing diode D2, a signal receiving circuit, a polar capacitor C4, a signal amplification circuit, a current regulation circuit and a linear driving circuit, wherein the signal amplification circuit is connected between the signal receiving circuit and a pin ANT of the control chip U1 in series; the current regulation circuit is connected with an emitting electrode of the triode VT1 and the control chip U1, respectively; and the linear driving circuit is connected with the current regulation circuit. According to the signal amplification circuit based light-control LED energy-saving control system, an interference signal in signals output by the luminance sensor can be eliminated so that the signals output by the luminance sensor are accurate, thus the accuracy of the system for signal processing is improved; and meanwhile the current intensity can be effectively regulated, thus steady currents can be output by the system.

The invention provides a pixel circuit and a driving method thereof, a display panel and a display device. The pixel circuit comprises a light-emitting module and a driving module, wherein the first end of the driving module is electrically connected with the light-emitting module, and is used for loading a first signal in a first time period, and loading a second signal in a second time period, the polarities of the first signal and the second signal are opposite, and the first time period and the second time period are not intersected. According to the scheme, drifting of the threshold voltage of the driving module can be slowed down, so that the service life of the display panel is prolonged.

The invention discloses a control system used for an automatic start-close type bath heater. The system is mainly formed by a control chip U, a temperature controller, a triode VT2, a polar capacitor C5, a polar capacitor C4, a voltage stabilizing diode D3, a transistor switch buffer circuit and a base electrode driving circuit connected to the control chip U, wherein an N pole of the voltage stabilizing diode D3 is connected to a VDD base pin of the control chip U and a P pole of the voltage stabilizing diode D3 passes through a resistor R8 and then is connected to an RC base pin of the control chip U; and the transistor switch buffer circuit is connected in series between the temperature controller and the control chip U. The system can control a temperature of a heating lamp of the bath heater, which means that the system can control on and off of a bath heater working current, therefore, the system is ensured to control the temperature of the bath heater. Simultaneously, the system can restrain an instant high current of an input current so that the current can keep stable, a stable driving current can be output and stability of the bath heater heating temperature is ensured.