263results about How to "Small driving current" patented technology

The invention discloses an organic electroluminescence display device and a driving method thereof, and a display apparatus. In the OLED display device, in each pixel unit group, sub-pixel units for displaying white are located between two adjacent pixel units, and the area occupied by the sub-pixel unit for displaying white is greater than the area occupied by any sub-pixel unit in the pixel unit, so compared with an existing OLED display device, the area occupied by a single sub-pixel unit for displaying white is increased, and the aperture opening ratio of a single sub-pixel unit for displaying white can be increased, so that the driving current and power consumption of the sub-pixel units for displaying white can be reduced, and finally, the service life of the OLED display device can be prolonged; and the brightness of light emitted by the sub-pixel units for displaying white is used to replace the brightness of light emitted by one pixel unit of two adjacent pixel units according to a preset condition, so the overall display brightness of the OLED display device can be ensured in the display process.

The invention discloses a magnetic random access memory unit based on Rashba effect. The magnetic random access memory unit comprises a magnetic multilayer film memory unit and a bit-writing line. The magnetic random access memory unit is characterized in that the magnetic multilayer film memory unit comprises a substrate, a non-magnetic layer, a core functional layer zone and a covering layer from bottom to top; the core functional layer zone comprises a lower magnetic layer, a medium layer and a upper magnetic layer from bottom to top; the bit-writing line is connected with the non-magneticlayer so that write current flows through the non-magnetic layer transversely and the magnetic torque of the lower magnetic layer is reversed, thus writing data. The invention also provides a programmable magnetic logic device and spinning microwave oscillator with the similar structure based on Rashba effect. The invention realizes the separation of reading and writing, can effectively protect the device from damaging during high current density reading or writing and can effectively reduce the current density and increase the maneuverability of the device; and the invention also adopts the design scheme of closed geometry, thus further reducing the interference of magnetic field to the device.

The invention provides an array substrate. The array substrate comprises a substrate and signal wires, wherein the signal wires are arranged on the substrate; conductive parts, corresponding to the signal wires, are further arranged on the substrate; the signal wires are in parallel connection with the corresponding conductive parts; and the conductive parts corresponding to different signal wires are insulated and are spaced. Correspondingly, the invention further provides a display device. According to the array substrate and the display device provided by the invention, the resistance of the signal wires can be reduced; and thus, the display effect is improved.

The invention discloses a driving device and a driving method of a data line of a liquid crystal display. In the drive method, a polarity control module sets the polarity of voltage applied to both sides of sub-pixels, the corresponding polarity of a sub-pixel in which the difference of the gray-scale value of a current frame and the gray-scale value of an adjacent previous frame is smaller than or equal to a first preset value is set to be same with the polarity of the adjacent previous frame, and the corresponding polarity of a sub-pixel in which the difference of the gray-scale value of a current frame and the gray-scale value of an adjacent previous frame is greater than the first preset value is set to be opposite to the polarity of the adjacent previous frame; and a data driving module generates a voltage signal corresponding to the gray-scale value received by a receiving module according to the polarity set by the polarity control module, and the voltage signal is input into a data line. The method provided by the invention does not reverse the corresponding polarity of the sub-pixel in which the difference of the gray-scale value of the current frame and the gray-scale value of the adjacent previous frame is smaller than or equal to the first preset value, so that the drive current can be decreased, and further, the power consumption of a drive circuit is decreased.

PROBLEM TO BE SOLVED: To provide a pixel circuit which compensates change with time of a drain current in a drive transistor.SOLUTION: In a drive transistor Tr2, a gate G is connected to an input node A, a source S is connected to an output node B, and a drain is connected to a power supply voltage Vcc. A sampling transistor Tr1 is connected between the input node A and a signal line DL. A holding capacitance C1 is connected to the input node A. The sampling transistor Tr1 samples an input signal Vsig from the signal line DL and holds in the holding capacitance C1. The drive transistor Tr2 supplies a drive current Ids to a light emitting element EL in accordance with the signal voltage held by the holding capacitance C1. The pixel circuit is equipped with a compensation circuit 7 to compensate a decrease in the drive current Ids caused by changes in the drive transistor Tr2 with time. The compensation circuit 7 detects a decrease in the drive current Ids through the output node B side and feedbacks the detection result to the input node A side.

The invention provides a pixel unit driving circuit and method as well as a pixel unit. The pixel unit driving circuit comprises a driving thin film transistor, a first switching element, a storage capacitor, a driving control unit and a charging control unit; a grid electrode of the driving thin film transistor is connected with the first end of the storage capacitor, and is further connected with a drain electrode of the driving thin film transistor through the charging control unit; a source electrode of the driving thin film transistor is connected with an OLED (Organic Light Emitting Diode), and is connected with the second end of the storage capacitor through the driving control unit; the drain electrode of the driving thin film transistor is connected with a driving power supply through the first switching element; the second end of the storage capacitor Cs is connected with the driving power supply through the charging control unit; the driving control unit is connected with the driving power supply and the OLED respectively; and the charging control unit is connected with a data wire and the OLED respectively. With the adoption of the pixel unit driving circuit provided by the invention, critical voltage of the driving thin film transistor is compensated, and the fall of driving current, caused by boosting of critical voltage due to material aging of the OLED, can be compensated.

The invention relates to an LED (light emitting diode) projection lamp with a heat sink. The LED projection lamp with the heat sink comprises a front cover, a back cover, a light emitting unit, a heat dissipation part, a fan, a temperature detector and a control unit, wherein the heat dissipation part comprises a heat dissipation shell and fins; the fan is arranged in the back cover; the control unit can control the on and off of the fan according to the temperature of the light emitting unit. According to the heat sink arranged on the LED projection lamp disclosed by the invention, the heat dissipation effect of the projection lamp can be effectively improved, the service life of the projection lamp is prolonged, and the power consumption of the fan is saved.

The invention relates to an LED (Light-Emitting Diode) display screen and an LED screen brightness uniformity regulating method. The device is provided with a data processor, a row driving chip, a line driving chip, an LED display array, a power supply module VCOM (Virtual Computer) and a power supply end VDD (Virtual Device Driver); the data processor respectively outputs signals to the row driving chip and the line driving chip; the output end of the row driving chip is connected with rows of the LED display array; the output end of the line driving chip is connected with lines of the LED display array; the power supply module VCOM and the power supply end VDD are respectively connected with the LED display array; the LED display array is provided with a plurality of LED units; the data processor compares input voltage data with nmin, and when the LED monomers are in a low gray scale state, the duty ratio is regulated by a row scanning signal so as to realize brightness uniformity regulation under the condition that the LED units are in the low gray scale state. According to the method, display quality of the LED screen can be improved and the service life of the LED display screen can be prolonged in the high gray scale; brightness uniformity of the LED screen can be improved in the low gray scale.

The invention provides a backlight unit and a display device comprising the same. The backlight unit comprises a substrate, a wavelength conversion film and a miniature LED (light-emitting diode) chip array, the wavelength conversion film comprises a phosphor and is arranged on the substrate, the miniature LED chip array comprises a plurality of miniature LED chips, and the cross section area of each miniature LED chip is smaller than or equal to 1mm<2>. According to the backlight unit, the cross section area of miniature LED chip array is small, more LED chips can be arranged in the same substrate area, so that the brightness of a backlight component is high and uniformly dispersed, the miniature LED chip array is thin, secondary lens dispensing is omitted, the whole thickness of the direct-type backlight unit can be reduced, the miniature LED chips have lower driving current, less electric energy is converted into heat energy, energy is saved, less heat is generated, and the service life of the backlight unit can be prolonged.

The embodiment of the invention discloses an array base board, a display panel and a display device. The invention relates to the display technical field. The array base board is characterized in that the display opening area of each pixel region comprises a multi-layer functional film, wherein the multi-layer functional film comprises a substrate, a buffer layer, a gate insulation layer, a first interlayer insulation layer, a planarization layer and an electrode film layer structure, and the buffer layer, the gate insulation layer, the first interlayer insulation layer, the planarization layer and the electrode film layer structure are sequentially formed along the direction away from the light-emitting side surface of the substrate; the electrode film layer structure comprises a pixel electrode, a public electrode and a first passivation layer which is arranged between the pixel electrode and the public electrode, and the refractive index of any layer of the multi-layer functional film is bigger than or equal to that of every layer of the functional film which is positioned between the layer of the multi-layer functional film and the substrate, and bigger than that of the substrate; the refractive index of every layer of the functional film increases gradually along the direction away from the substrate, and the transmittance of backlight light can be improved; therefore, a driving voltage or a driving current of a backlight module can be indirectly reduced, so can the power consumption.

The invention relates to an automatic calibration method and device for printing of a patient monitor. The patient monitor printing method comprises the following steps of: detecting working state information of a printer, and acquiring the state information; determining the working state of the printer according to the working state information; sending out a sensing signal when the working state is idle, and sensing location mark information which is preset on printing paper to acquire the position information of the printing paper; determining whether the printing is deviated or not according to the acquired position information of the printing paper; regulating positions of a start point and an end point of a printing baseline when the printing is deviated; and printing monitor data when the printing baseline is regulated and the printing is not deviated. According to the automatic calibration method and device for printing of the patient monitor, the problem that errors exist between screen displayed data and printed data is solved, the printing drive current is reduced, and the service life of a thermal printing head is prolonged.

The invention discloses a closed-loop control circuit for a power switching device and a method. The closed-loop control circuit comprises a voltage differential circuit, a comparator circuit, a delay circuit and a current driving circuit, wherein the first input end of the comparator circuit is connected with the output end of the voltage differential circuit; the second input end of the comparator circuit is used for being connected with reference voltage; the input end of the delay circuit is connected with the output end of the comparator circuit; the first input end of the current driving circuit is connected with the output end of the delay circuit; the second input end of the current driving circuit receives PWM signals; and the output end of the current driving circuit is connected with the control end of the power switching device. A voltage change rate dv/dt signal is detected through the differential circuit, when the dv/dt signal is larger than the reference voltage, the current driving circuit is controlled, instantaneous current is provided, gate driving current is reduced, and the voltage overshoot is maintained to be unchanged basically. The driving circuit can be accurately controlled to output voltage and current, the turn-off speed is quickened, and the turn-off loss is reduced.

The invention discloses an independent grid-controlled nano line field effect transistor which comprises an inner grid electrode, an outer grid electrode, inner and outer grid dielectric layers, a channel region, a source region and a drain region, wherein the inner grid electrode is positioned at the center of the whole device structure; and the inner grid dielectric, the channel region, the outer dielectric and the outer grid electrode are coaxially arranged from inside to outside to completely enclose the inner-layer region. The arrangement of the inner grid electrode can enable the nano line device to work under the condition of independent grid control so as to provide a selection scheme for the design of a low power consumption circuit, and the threshold voltage is more sensitive to the adjustment of the controlled electrode. When the device works under the common grid condition, the electrical performance of the device is superior to that of the conventional nano circular grid device and double grid device. For a silicon film thickness of 10nm, the independent grid-controlled nano line transistor device can shorten the grid length to 20nm.

The present invention discloses a giant magnetostrictive micro displacement drive device based on the principle of temperature control by phase change water cooling. The current is used for controlling the drive device to output the displacement and through the coordination of the phase change temperature control device and the water cooling circulating device, the inside heat of the drive is brought to the outside environment to suppress the temperature increasing of the drive and heat output error to improve the control precision of the displacement output. The drive of the invention has the advantages of simple structure, relatively small drive current, stable operation and good frequency response, and combines the advantages of the phase change temperature technique and water cooling temperature control technique to perform long-time temperature control and suppress the heat output error effectively, without establishing a complex mathematical model. Consequently, the control precision of the displacement output can reach the micron grade or higher and the device can adapt to various poor working conditions. At the same time, the device has the advantages of small volume, light weight, large output force and highly precise displacement, can suppress the influence of the thermal deformation on the output displacement of the drive and can be used in the fields of ultraprecise machining and vibration control.

The invention discloses a novel common rail injector. The novel common rail injector comprises an injector part, an electromagnetic valve part and an injection nozzle part. The electromagnetic valve part and the injection nozzle part are installed at the upper end and the lower end of the injector part correspondingly. The mode combining the two-position three-way electromagnetic valve control part with the injection nozzle part with adjustable starting pressure is adopted, the structure is simple, and the injection initial point and injection amount can be flexibly controlled. A control valve element and an armature lever are of a fuel pressure self-balancing structure, the injection starting response speed can be remarkably increased, and the drive current of an electromagnet can be lowered, so that the service life of the electromagnet is effectively prolonged, and the reliability of the electromagnet is effectively improved. Return oil throttling holes are formed in an adjusting shim, return oil can be effectively controlled, and the return oil amount is reduced. Return oil grooves are formed between valve bodies, and the leakproofness can be remarkably improved. Pressure control chamber structures, oil outlet throttling hole control ball valves and control piston matching part pairs of traditional common rail injectors are omitted, the parts are easy to manufacture, the manufacturing difficulty is low, and the process cost is low.

Disclosed is a dual clutch transmission wherein, during a pre-shifting operation wherein, when a vehicle is driven using either a first or a second drive force transmission path extending from first and second input shafts (12, 13) to an output shaft (14), a synchronizer (S1, S2) of the other drive force transmission path is operated, the drive force of an internal combustion engine (E) is changed by a command from an electronic control unit (U), and accordingly, even when a drive force or a braking force is generated by inertia, due to a change in the number of rotations of the first and second input shafts (12, 13) in conjunction with the pre-shifting operation, the drive force or the braking force generated by inertia can be compensated by a change in the drive force of the internal combustion engine (E), to reduce shift-shock. Furthermore, the shift-shock can be reduced by only changing the drive force of the internal combustion engine (E) without adding any special structures to the dual clutch transmission (T), and accordingly, the cost and size of the dual clutch transmission (T) can be prevented from increasing.

The present invention discloses a method for reducing gradient coil eddy current in magnetic resonance image-forming system. Said invention utilizes the method of reducing diameter of Z gradient coil to reduce the eddy current produced by gradient coil and adopts the mode of changing Z gradient coil winding to ensure that the image-forming space is not changed. Said invention also provides the concrete requirements for reducing Z gradient coil diameter, and said method can effectively reduce the eddy current produced by gradient coil.

The invention relates to a linear polarization laser output high-power optical fiber amplifier and an output control method. The optical fiber amplifier comprises an optoisolator, a pumping beam combiner, a double-clad active optical fiber, an optical fiber collimator, a polarizer, a pumping laser and a pumping laser drive control circuit. The polarizer is provided with a main polarization shaft output end and an auxiliary polarization shaft output end. A microprocessor of the pumping laser drive control circuit is connected with a pumping drive circuit, the pumping drive circuit is connected with the pumping laser, a photoelectric detector connected to the auxiliary polarization shaft output port and a current detector for monitoring a pumping drive current are connected with the microprocessor. The control method includes the steps that a total power-current function P (I) and insertion loss of a main polarization shaft and an auxiliary polarization shaft are firstly obtained and stored; auxiliary polarization shaft output power is obtained through the photoelectric detector, when a polarization state changes, the pumping drive current is calculated, amplifier output total power is adjusted, constant output of laser power of the main polarization shaft is achieved without influence of environmental factors. Moreover, a luminous power beam splitting device is not needed, feedback control is achieved, and cost is reduced.

The invention discloses a resonant frequency tracking circuit of a piezoelectric ceramic transformer. The resonant frequency tracking circuit comprises piezoelectric ceramics, a current switch, a sampling circuit and a phase-locked loop circuit. The piezoelectric ceramics is connected with one end of a resonance inductor, the current switch is connected with the other end of the resonance inductor and is used for converting direct-current voltage input by a power supply into high-frequency pulse current, the sampling circuit is used for sampling input signals or output signals by the piezoelectric ceramics, the phase-locked loop circuit is connected with an output end of the sampling circuit and is used for correcting the sampled signals and outputting the corrected signals as feedback signals to the current switch to control pulse current frequency output by the current switch. The problem that transmission efficiency is lowered since resonant frequency of the piezoelectric ceramic transformer changes along with operation temperature and output load is eliminated and phase of drive frequency can be locked between 105 degrees to 110 degrees by the resonant frequency tracking circuit of the piezoelectric ceramic transformer, and the piezoelectric ceramic transformer is protected from being damaged.