Gate driver

About: Gate driver is a research topic. Over the lifetime, 7532 publications have been published within this topic receiving 75854 citations.

Liquid crystal display device and driving method thereof

Abstract: The embodiment of the invention discloses a liquid crystal display device and a driving method thereof. The liquid crystal display device includes a gate driver, a source driver, a time sequence controller and a display panel; the time sequence controller is used for outputting first control signals to the gate driver and outputting second control signals to the source driver; the gate driver is used for outputting gate driving signals to gate lines according to the first control signals; the source driver is used for outputting data driving signals to data lines respectively according to the second control signals when the gate driver outputs the gate driving signals to the gate lines; and the source driver controls polarity of the data driving signals loaded on the data lines according to the second control signals so as to make the polarity of the data driving signals change for once every two frames of images. With the liquid crystal display device and the driving method thereof of the invention adopted, display quality can be improved.

Experimental Validation of Normally-On GaN HEMT and Its Gate Drive Circuit

Abstract: Wide-bandgap semiconductors such as silicon carbide (SiC) and gallium nitride (GaN) are promising materials for next-generation power devices. We have fabricated a normally on GaN-based high-electron-mobility transistor (GaN HEMT) for power electronic converters. In this paper, the current collapse phenomena, which are distinctive characteristics of GaN devices, are evaluated in detail for several voltages with two switching frequencies. We also evaluate a gate drive circuit that we previously proposed for the normally on GaN HEMT with a single positive voltage source. We construct and test prototype circuits for a boost-type dc–dc converter and a single-phase full-bridge inverter with a gate drive circuit. The problems to be solved for the normally on GaN HEMT, which has a (static) voltage rating of over 600 V, are clarified on the basis of the experimental results.

Liquid crystal display having gray voltages with varying magnitudes and driving method thereof

Abstract: A liquid crystal display (“LCD”) having a plurality of gray voltages with varying magnitudes and a driving method thereof. An LCD includes a reference voltage generator changing level of a supply voltage based on a first signal to generate a reference voltage. The first signal varies depending on the surrounding brightness of the LCD, the brightness of the on-screen images of the LCD, and user's manipulation. The LCD also includes a gray voltage generator generating a plurality of gray voltages with magnitudes varying dependent on the magnitude of the reference voltage and a predetermined voltage such as a ground voltage. The LCD further includes a plurality of gate lines transmitting a plurality of gate signals, a plurality of data lines transmitting the gray voltages, and a plurality of pixels. Each pixel has a switching element connected to one of the gate lines and one of the data lines and transmitting the gray voltages to the pixels under the control of the gate signal. The LCD includes a gate driver supplying the gate signals to the gate lines and a data driver selecting the gray voltages based on gray data from an external source to supply to the pixels via the data lines.

Drive circuit for use in liquid crystal display, liquid crystal display incorporating the same, and electronics incorporating the liquid crystal display

Abstract: A drive circuit for use in a liquid crystal display supplies source signals from a source driver to pixel electrodes through switching by means of TFTs according to scan signals from a gate driver, includes a reference voltage generator circuit for adjusting potential differences between the pixel electrodes and a common electrode so as to compensate for the effects of variations in drain voltages caused by parasitic capacity in the TFTs and compensate for irregularities in DC voltage caused by asymmetry in properties between an active matrix substrate and an opposite substrate sandwiching a liquid crystal layer. The reference voltage generator circuit is composed of a reference voltage generator circuit for shifting the voltage levels of the source signals supplied by the source driver equally for all the pixel electrodes. Thus, the drive circuit for use in a liquid crystal display is applicable to portable electronics operative without necessarily performing periodical D/A conversions and includes the reference voltage generator circuit running on a reduced power supply.

A resonant MOSFET gate driver with complete energy recovery

Abstract: At high frequency power conversion applications, the power loss in driving power MOSFETs is significant. To reduce this loss, some resonant MOSFET gate drive schemes have been published. In this paper, a new resonant gate driver is proposed. In contrast with other gate drive schemes, the proposed driver features complete energy recovery during both charging and discharging transitions, as well as minimized conduction loss. Simulation and experiment results show that the proposed driver can reduce MOSFET gate drive loss very effectively.