31results about How to "Stable driving voltage" patented technology

Field emission display and method for fabricating the same, the field emission display including a cathode array having a cathode electrode formed on a substrate, insulating layers and carbon nanotube films for use as emitter electrodes formed alternately on the cathode electrode, and a gate electrode formed on the insulating layer, thereby permitting fabrication of a large sized cathode plate at a low cost because the film is formed by screen printing and exposure, which can reduce the cumbersome steps in fabrication of the related art Spindt emitter tip, and both a low voltage and a high voltage FEDs because the carbon nanotube film used as the emitter has a low work function, with an easy and stable electron emission capability.

A cascaded organic electroluminescent device with connecting units having improved voltage stability is disclosed. The device comprises an anode, a cathode, a plurality of organic electroluminescent units disposed between the anode and the cathode, wherein the organic electroluminescent units comprise at least a hole-transporting layer and an electron-transporting layer, and a connecting unit disposed between each adjacent organic electroluminescent unit, wherein the connecting unit comprises, in sequence, an n-type doped organic layer, an interfacial layer, and a p-type doped organic layer, and wherein the interfacial layer prevents diffusion or reaction between the n-type doped organic layer and the p-type doped organic layer.

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.

A voltage generator includes a first voltage booster and a second voltage booster. The first voltage booster boosts an input voltage to generate a first boosted voltage applied to a load. The second voltage booster generates a second boosted voltage applied to the load when the first boosted voltage is out of a critical range. The second boosted voltage is generated by the voltage generator when the first boosted voltage is applied to the load. Therefore, the second boosted voltage may compensate for an instability of first boosted voltage.

The invention discloses a synchronous rectification driving circuit of a flyback circuit, which has simple structure, easy realization, high efficiency and small volume. The gate-level driving circuit of the secondary edge synchronous rectifying tube Q2 comprises a capacitor C2, resistors R2, R3 and R4, diodes D1 and D2, and a PNP triode VT1, and a driving transformer Tr1 realizes the isolation and transmission of primary side PWM driving signals. The invention uses few discrete elements for forming the driving circuit, thus realizing that the driving voltage is kept to be relatively stable within the wide input voltage range, and avoiding the common-pass phenomenon of a main switching tube Q1 and a synchronous rectifying tube Q2. The invention improves the efficiency of a converter and enhances the reliability of the circuit.

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 pixel structure, disposed on a first substrate, and electrically coupled to at least one scan line and at least one data line is provided. The pixel structure includes a first switch device, a second switch device, at least one pixel electrode, at least one control electrode, and at least one coupling electrode. The first switch device is electrically coupled to the scan line and the data line. The second switch device is electrically coupled to the scan line and the data line. The pixel electrode is electrically coupled to the second switch device. The control electrode is electrically coupled to the first switch element. The coupling electrode is disposed under the control electrode.

The invention discloses an electrochromic fiber and a preparation method thereof. The electrochromic fiber comprises an electrode and a substrate. The electrode comprises at least one pair of electrode wires arranged in parallel. The electrodes are arranged in the substrate. The electrochromic fiber further comprises a liquid crystal material. The substrate comprises at least one pore-like structure parallel to the electrode wires. The liquid crystal material is filled in the pore-like structure of the substrate. According to the invention, the electrochromic fiber based on the electric fieldexcited liquid crystal material is obviously superior to light and temperature in regulation; the good controllability thereof and flexibility have great application advantages in flexible display such as flexible sensing and smart wear; the electrochromic fiber based on the liquid crystal material is prepared by a hot drawing process; and the electrochromic fiber has the advantages of high production efficiency and mass production.

The invention is an electronic power switch composed of field effect tube and is designed for controlling charging and discharging of electrically-propelled vehicle. It comprises an electronic power switch circuit and a switch driving circuit. The power switch circuit composed of switch transistor is connected to the main power supply circuit in series, and the control electrode of switch transistor is connected to the switch driving circuit; the input of switch driving circuit is connected to the switch control circuit, and its output is connected to the voltage stabilizing circuit; the switch control circuit is composed of the R-S trigger; its working power supply and main power supply use different sources. The invention adopts an electronic voltage regulation circuit, a power separation between the switch control circuit and the main power circuit and a short circuit protection so as to effectively control the voltage fluctuation of circuit and power on/off of circuit.

A semiconductor memory for maintaining a word line driving voltage includes a cell array and a sense amplifier adjacent to the cell array. A dummy cell is formed at a peripheral portion of the cell array in such a manner that a dummy bit line and a word line intersect. A control circuit switches the connection state between a first section of the dummy bit line passing through the cell array and a second section of the dummy bit line passing through the sense amplifier. The connection state switches according to the operation mode of the cell array. The dummy bit line is floated when the operation mode is an active mode and a precharge voltage is provided to the dummy bit line when the operation mode is a precharge mode.

The invention discloses a three-phase high-speed rotation positive electrode driver. The three-phase high-speed rotation positive electrode driver mainly comprises an MCU-SPWM driving circuit module,a SPM intelligent driving circuit module, an ADC detection circuit module, an independent driving power supply module and a driving signal control circuit module, wherein the driving signal control circuit module, the MCU-SPWM driving circuit module and the SPM intelligent driving circuit module are sequentially connected, the SPM intelligent driving circuit module is further connected with the ADC detection circuit module and the independent driving power supply module, and the ADC detection module is further connected with the MCU-SPWM driving circuit. A SPWM pulse waveform at 50-180Hz generated by a singlechip microcomputer (MCU) is mainly used, a post-stage FSBS15CH60 intelligent driving circuit module is controlled to generate an alternating current so as to drive the motor to rotateby driving and amplification, the rotation speed of a target surface can be effectively increased, the imaging effect is improved, the target surface is prevented from being easily damaged by an electronic beam, and the service lifetime of equipment is prolonged.

Provided is a gallium nitride semiconductor light emitting element wherein a drive voltage is stabilized by reducing spontaneous polarization generated on an interface between an AlGaN semiconductor layer and a GaN semiconductor layer and carrier depletion due to piezo polarization. On a plane (R) of a sapphire substrate (1), a gallium nitride semiconductor crystal (2) including a light emitting region is formed. In other constitution, on a plane (A) or a plane (M) of GaN substrates (3, 4), the gallium nitride semiconductor crystal (2) is formed. Since the growing planes of these gallium nitride semiconductor crystals (2) are nonpolar planes and not an N (nitrogen) polar plane nor a Ga polar plane, an electric field caused by spontaneous polarization and piezo polarization generated on a GaN/AlGaN interface on a p-side can be reduced and carrier depletion can be eliminated.

The invention discloses a high-order energy supplementing bootstrap circuit and a control method thereof. An isolation power supply taking a bus positive P as the ground is added on the basis of a traditional bootstrap circuit; when the voltage of an upper tube bootstrap capacitor is reduced, the power supply charges the upper tube bootstrap capacitor through a resistor and a switch tube, so the prominent problem of a traditional bootstrap circuit is solved, the stability of the driving voltage of the upper tube can be ensured even if the upper tube is continuously switched on or continuouslyswitched on at a high duty ratio, and the adaptive working conditions and application occasions of the bootstrap circuit are greatly expanded. Compared with an isolation power supply scheme, the scheme of the invention can reduce N-1 isolation power supplies, wherein N is the phase number of the bridge circuit; the power supply design is greatly simplified, the power supply size is reduced, and the power supply cost is reduced.

The present application discloses a display panel, including a display body and a plurality of driving modules including a driving unit electrically connected to the display body; wherein at least a part of the driving modules further includes a voltage conversion unit, an input terminal of the voltage conversion unit is connected to a high-potential power supply voltage, and an output terminal of the voltage conversion unit is electrically connected to an input terminal of the driving unit to provide a preset driving voltage for the driving unit.