Patent DE-102006058816-A1 (DE)
Title: Liquid crystal display useful as television set/for portable purposes such as monitor for note book, comprises liquid crystal panel with liquid crystal pixels, gate driver, data driver, time control, and segment in the form of single chip
Inventor: OH DONG KYOUNG
IPC: C09K19/02
Filed: 2006-12-13
Abstract: The liquid crystal display useful as television set or for portable purposes such as monitor for note book, comprises a liquid crystal panel (102) with liquid crystal pixels that are formed in segments, a gate driver (104) that drives gate lines, a data driver (106) that drives data lines as a response to a pixel data stream, a time control (108) that regulates the gate driver and the data driver, and a segment in the form of a single chip, which is connected to an external input power source for generating driver voltages and delivers voltages. The liquid crystal display useful as television set or for portable purposes such as monitor for note book, comprises a liquid crystal panel (102) with liquid crystal pixels that are formed in segments, a gate driver (104) that drives gate lines, a data driver (106) that drives data lines as a response to a pixel data stream, a time control (108) that regulates the gate driver and the data driver, and a segment in the form of a single chip, which is connected to an external input power source for generating driver voltages and delivers voltages that are required for the common electrode on the liquid crystal panel, the gate driver, the data driver and the time control. Each pixel responds to a signal at the corresponding gate line and is driven by a difference voltage between the voltages at the corresponding data line and a common electrode respectively. The segments are divided into gate and data lines respectively. The segment for generating driver voltages includes a DC-DC converter, which produces a first supply voltage with a constant high potential that is obtained by a DC-DC conversion of the input voltage, and a second supply voltage with a reference potential, a segment for generating high gate voltages that is meant for generating a higher gate voltage of such a magnitude that facilitates the gate driver with the first and second supply voltages to optionally drive the gate lines, a segment for generating lower gate voltages that is meant for generating a lower gate voltage of such a magnitude that facilitates the gate driver with the first and second supply voltages to optionally disable the gate lines, and a level converter for generating a third supply voltage by conversion of the level of the first supply voltage. The third supply voltage is needed for driving the gate driver, the data driver and the time control, and a segment for generating a common voltage that is meant for generating such a common voltage from the first and second supply voltages that is to be delivered to the common electrode of the liquid crystal panel. The segment for generating the driver voltage also consists of a segment for generating gamma voltages. The gamma voltages are produced by splitting the difference voltage from the first and second supply voltages into two units and are applied to the data driver. The segment for generating high gate voltages produces the high gate voltage by means of a positive multiplication of the voltage in association with a clock from the time control mechanism. The segment for generating lower gate voltages produces the lower gate voltage by a negative multiplication of the voltage in association with a clock from the time control mechanism. The segment for generating general voltages consists of a voltage divider that splits a difference voltage between the first and second supply voltages, and a voltage buffer for buffering the divided voltage and delivery of the buffered voltage as a general voltage.