33results about How to "Stable driving voltage" patented technology

In an OLED device, the improvement including a reflective and conductive bilayer anode including a metal or metal alloy or both; a hole-injecting structure over the reflective and conductive bilayer anode; at least one organic layer formed over the hole-injecting structure; and the reflective and conductive bilayer anode being configured to improve the stability of drive voltage.

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.

The invention discloses a method and a device for controlling the voltage of an LCD (liquid crystal display) based on a ladder resistance network. The method comprises the following steps of regularly detecting the current voltage of a power supply which powers the LCD, and determining a voltage interval to which the current voltage belongs; according to a corresponding relation between the preset voltage interval and the number of voltage-dividing resistors, acquiring the number of the voltage-dividing resistors corresponding to the voltage interval to which the current voltage belongs; and according to the acquired number of the voltage-dividing resistors, adjusting the number of the voltage-dividing resistors connected to the ladder resistance network. By the method and the device, the real-time voltage of the power supply which powers the LCD is detected regularly and the number of the voltage-dividing resistors connected to the ladder resistance network is dynamically adjusted, so that the driving voltage of the LCD is kept stable, and the display effect of the LCD is ensured.

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 circuitof 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 an electrochromic fiber and a preparation method thereof. The electrochromic fiber includes an electrode and a base material, and the electrode includes at least a pair of electrode wires arranged in parallel, and the electrode wires are arranged on the base material. In addition, the electrochromic fiber also has a liquid crystal material, the substrate has at least one pore-like structure parallel to the electrode wire, and the liquid crystal material is filled in the pore-like structure of the substrate. The color-changing fiber based on the liquid crystal material excited by the electric field provided by the present invention is obviously superior to light and temperature in terms of regulation, and its good controllability and flexibility have great application advantages in flexible displays such as flexible sensing and smart wear. The electrochromic fiber based on the liquid crystal material is prepared by a thermal stretching process, which has high production efficiency and can be produced on a large scale.

Disclosed is an organic light-emitting element and organic light-emitting display device using the same, which has light transmission, is capable of reducing the resistance of the element, and is reliable regardless of variation in temperature or environment.

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.

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 device and a control method for preparing wind energy, ocean energy and solar energy, wherein the device comprises a fan, an impellor, a solar battery pack, a storage battery, a commercial power interface, an air tank, an air compressor, a sensor, a transmission and a controller, the corresponding transmission gears are selected according to the real-time pressure of the air tank, so that a drive electromotor can operate within the rotation speed range with the highest efficiency so as to reduce the number of air compression stages required without the transmission; the instability of energy supply of wind energy, ocean energy and solar energy can be eliminated by adopting commercial power supplement measures, and a flywheel is arranged between an electromotor and the air compressor, thus the rotation speeds of the electromotor and the air compressor can be more stable; and meanwhile, direct-current electricity energy is provided for the drive electromotor of each stage of air compressors by utilizing the wind energy, ocean energy and solar energy, the complementation of multiple kinds of renewable energy sources is realized, the instability of single renewable energy source is relieved, and greater available power can be obtained.

There are provided a pixel unit driving circuit and driving method, pixel unit and display apparatus. The pixel unit driving circuit is used for driving a light-emitting device to emit light, and comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3) and a storage capacitor (Cs). A gate of the first thin film transistor (T1) is connected with a control line (Gate), a first electrode thereof is connected with a data line (Data), and a second electrode thereof is connected with a first node (A). One gate of the second thin film transistor (T2) is connected with the control line (Gate) and the other gate is connected with a second scan line (Scan2), a first electrode thereof is connected with the storage capacitor (Cs), and a second electrode thereof is connected with a second node (B). One gate of the third thin film transistor (T3) is connected with the first node (A) and the other gate is connected with the second scan line (Scan2), a first electrode thereof is connected with a power supply (Vdd), and a second electrode thereof is connected with the second node (B). One terminal of the storage capacitor is connected with the first node (A), and the other terminal is connected with the first electrode of the second thin film transistor (T2). One terminal of the light-emitting device is connected with the second node (B), and the other terminal thereof is grounded. The pixel unit driving circuit can reduce an influence on a driving voltage caused by variations in threshold voltage.