GATE DRIVING CIRCUIT AND DRIVING METHOD THEREOF FOR LCD

• Main Authors: CHAE, JI EUN, MOON, SOO HWAN, KIM, DO HEON
• Format: Patent
• Language: English
• Published: 20.12.2007
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; EDUCATION; FREQUENCY-CHANGING; INFORMATION STORAGE; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; STATIC STORES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A gate driving circuit and a gate driving method for an LCD device are provided to reliably drive the LCD(Liquid Crystal Display) device by maintaining a QB node at a low state for three horizontal periods. A gate driving circuit of an LCD includes plural stages(50) and a control signal output portion(60). The stage includes a shift register circuit having a pull-up transistor and a pull-down transistor. The pull-up and pull-down transistors are connected to a gate driving signal output terminal. The pull-up and pull-down transistors are controlled by first and second nodes, respectively. The control signal output portion alternatively applies first and second control signals to switching control electrodes of the pull-down transistors in every two stages from an uppermost level.