Multi-output DC / DC voltage converter and liquid crystal display using the same

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple output direct current / direct current voltage converting apparatus which is mainly applied to an active matrix type liquid crystal display (LCD);A liquid crystal panel (1) having a plurality of pixels arranged in a matrix in a region defined by a plurality of gate lines and a plurality of data lines orthogonal thereto; A gate driving circuit (2) for sequentially scanning the pixels on the liquid crystal panel row by column by sequentially applying a gate-on voltage to the gate line; A source driving circuit (3) for receiving a color signal and a plurality of gradation voltages, selecting a gradation voltage corresponding to the color signal, and applying the selected gradation voltage to a data line of the liquid crystal panel; And a grayscale voltage generator (4) for generating a plurality of grayscale voltages from the data driving voltage and supplying the same to the source driving circuit, characterized in that an input voltage and a switching signal of the primary side of the transformer A plurality of output DC / DC voltage converters for generating a main power source and at least two or more auxiliary power sources in a coil and a secondary coil, respectively, and outputting the main power source as a data driving voltage and the auxiliary power source as a gate-(5, 5 '),;It is possible to provide multiple outputs with high efficiency in generating voltage signals necessary for liquid crystal driving.