45results about How to "Reduce current difference" patented technology

The invention discloses a multi-chip parallel-connected half-bridge IGBT module. The module includes a heat-conducting bottom plate and a ceramic copper-clad substrate. Chips and bonding wires for connection are arranged on the ceramic copper-clad substrate. The chips form an upper bridge arm and a ceramic copper-clad substrate. The lower bridge arm, each bridge arm contains at least two IGBT chips, and each IGBT chip is attached with a freewheeling diode to form an IGBT chip unit. The IGBT chip units that make up each bridge arm are arranged vertically on the ceramic copper-clad substrate. The gates of all IGBT chips of the bridge arm point to the same direction, and the gates of each IGBT chip are connected to the gate bonding point on the copper clad substrate through independent bonding wires and finally connected through copper clad or bonding wires to the gate copper strips of the corresponding upper and lower bridge arms.

The embodiment of the invention provides an organic light emitting diode pixel circuit and a display device which are used for solving the problem that because threshold voltages of drive transistors in different pixel units of a traditional organic light emitting diode pixel circuit are different, images on a whole display panel can not be displayed evenly. A drive signal generation module in the organic light emitting diode pixel circuit reads and stores the threshold voltages of the drive transistors in the threshold voltage reading stage, receives an image data signal in the signal loading stage, and generates a drive signal according to the received image data signal or the stored threshold voltages of the drive transistors in the threshold voltage reading stage, and therefore the drive signal is made to be relevant to the threshold voltages of the drive transistors.

The invention discloses a driving circuit for a backlight system of a light-emitting diode, which comprises input voltage, input resistance, an operational amplifier, a first transistor and a current arithmetic unit, wherein the positive input end of the operational amplifier is electrically connected with the input voltage through the input resistance, and the output end of the operational amplifier is electrically connected with the negative input end of the operational amplifier through a feedback network; the first transistor is used for acquiring reference current according to the input voltage and the input resistance to control the output voltage of the operational amplifier; and the current arithmetic unit is used for generating a plurality of operating currents which are proportional to the reference current according to the output voltage of the operational amplifier to drive a plurality of light-emitting diode series groups.

The method for fabricating an array substrate, the array substrate, and the display device provided by the embodiments of the present invention firstly open holes for the first thin film transistor, then perform hydrogen replenishment treatment on the first thin film transistor and the second thin film transistor, and then perform the hydrogen replenishment treatment on the second thin film transistor. The thin film transistor is opened, and the first thin film transistor and the second thin film transistor can be repaired and compensated to different degrees through hydrogen replenishment treatment. Among them, since the first thin film transistor is opened first, the compensation of the first thin film transistor is weakened. The hydrogen effect can not only appropriately reduce the slope of the current-voltage curve of the first thin film transistor, reduce the current difference caused by the threshold voltage difference, but also increase the electron mobility of the second thin film transistor as much as possible, and increase the charging capacity of the capacitor within the rated time , reduce the current difference between the circuits, so that the display device can emit light evenly, reduce the chance of mura occurrence, and alleviate the mura effect.

The invention discloses a driving method and device of a display panel. The display panel includes a pixel circuit, and the method includes: setting a first initialization voltage according to a display brightness value; providing the first initialization voltage to the pixel circuit to initialize a light-emitting module in the pixel circuit. By setting the first initialization voltage according to the display luminance value, when the display luminance value is relatively low, the first initialization voltage is set to be relatively large, and the driving current can be reduced by providing the initialization voltage to the transistor of the light-emitting device during the light-emitting phase of the pixel circuit The leakage current of the pixel circuit can be reduced, thereby reducing the leakage current phenomenon in the pixel circuit, reducing the current difference of the pixel circuit driving the light-emitting device to emit light caused by the leakage current characteristic of the transistor, and improving the brightness uniformity of the display panel.

The invention provides a field emission type display panel, which comprises a substrate provided with at least a display region and a non-display region. A first conductive layer disposed on the display region comprises a first electrode line and a first electrode electrically connected with the first electrode line. A resistance material layer is positioned on the first conductive layer in the display region. An insulating layer covering the resistance material layer in the display region is provided with a first opening and a second opening. Part of the resistance material layer above the first electrode is exposed through the first opening. Part of the resistance material layer above the first electrode line is exposed through the second opening. An electronic emission element is arranged on the resistance material layer exposed through the first opening. A second conductive layer disposed on the insulating layer is positioned in the second opening. The second conductive layer comprises a second electrode line and a second electrode electrically connected with the first electrode line. The second electrode is provided with a third opening so as to expose the electronic emission element. At least a first sub-pixel region and a second sub-pixel region are defined through the second electrode line and the first electrode line.

The embodiment of the invention provides a pixel circuit for compensating shift of a threshold voltage and a thin film transistor backplane, so as to solve the problem of uneven display of an image caused by the shift of the threshold voltage in the prior art. The pixel circuit comprises a driver module and a signal loading module, wherein the driver module comprises a VDD (virtual device driver) signal source, a driver transistor T1, a storage capacitance C1 and an OLED (organic light emitting diode) D1; a grid electrode of the driver transistor T1 is connected with an output end of the signal loading module and drives the OLED D1 to emit light; one end of the storage capacitance C1 is connected with an output end of the VDD signal source, and the other end of the storage capacitance C1 is connected with the grid electrode of the driver transistor T1; the driver module further comprises a p-shaped decaying transistor T2, the grid electrode is connected with a source electrode and is connected with the output end of the VDD signal source, a drain electrode is connected with the source electrode of the driver transistor T1; alternatively, the driver module further comprises a n-shaped decaying transistor T2, the grid electrode is connected with the drain electrode and is connected with the output end of the VDD signal source, and the source electrode is connected with that of the driver transistor T1.

The invention relates to a dynamic loss reduction method for a distribution network and a synthesized loss reduction system of a distribution network. A principle that an electric field and a magnetic field are mutually symbiotic and affected is applied for dynamically realizing electromagnetic balance; the treatment of'peak load shifting'is carried out on the current difference value between three-phase unbalanced currents caused by the dynamic unbalance of the power used by a three-phase load at the secondary side of a distribution transformer so as to lead the current difference value to approach balance, reduce a zero sequence current and the unbalance degree of the three phases, and restrain a harmonic, thereby realizing the self loss (loss on transmission) of the distribution transformer and the line loss (the copper loss of the line) at the first side and the secondary side of the distribution transformer; the synthesized loss reduction system of the distribution network realizes the synthesized loss reduction management of the distribution network, the loss on transmission of the distribution transformer as well as the automatic measuring and accounting on the data of the copper loss of the line at the first side and the secondary side thereof; the system also realizes the remote automatic collection on the power data of the distribution transformer in the same time aswell as the accounting of the line loss of a distribution line, calculates and accounts the line loss of the distribution network, calculates and analyzes the loss reduction as well as analyzes the benefits of energy saving and emission reduction.