Patent ID: 8446402
Filing Date: 2013-05-21
Classification: G09G

Abstract:
1. A liquid crystal display comprising: a liquid crystal display panel having a plurality of data lines and a plurality of gate lines positioned to cross one another and a plurality of liquid crystal cells driven according to a voltage difference between a data voltage and a common voltage positioned in a matrix format; a side printed circuit board (PCB) connected to the side of the liquid crystal display panel; a DC to DC converter mounted on the side PCB to produce a driving voltage of the liquid crystal display panel; a data drive circuit connected between the side PCB and the data lines of the liquid crystal display panel to convert digital video data into the data voltage using a gamma reference voltage and to supply the data voltage to the data lines; a gate drive circuit connected to the gate lines of the liquid crystal display panel to sequentially supply a gate pulse swinging between a gate high voltage and a gate low voltage to the gate lines; and a timing controller that supplies the digital video data to the data drive circuit and controls an operating timing of the data drive circuit and an operating timing of the gate drive circuit, wherein the DC to DC converter includes at least one of a first voltage adjusting circuit converting an input voltage into a high potential power supply voltage of 15V-20V and a logic power supply voltage of about 3.3V, a second voltage adjustinq circuit converting the high potential power supply voltage into the gate high voltage equal to or greater than 15V and the gate low voltage equal to or less than −3V, a third voltage adjusting circuit converting the high potential power supply voltage into the common voltage of 7V-8V, a fourth voltage adjusting circuit dividing the high potential power supply voltage to generate the gamma reference voltage, and a fifth voltage adjusting circuit converting one of the input voltage and the logic power supply voltage into a core power voltage of 1.2V-1.8V to supply the core power voltage to the timing controller, wherein at least one of the first to fifth voltage adjusting circuits is mounted on the side PCB.