A SHIFT REGISTE

• Main Authors: CHAE, JI EUN, KANG, WON SEOK, PARK, SUNG JIN
• Format: Patent
• Language: English
• Published: 02.06.2008
• 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 shift register is provided to prevent multi outputs by setting a charge voltage source based on the variation amount of a threshold voltage of a pull-down switching element. A shift register includes plural stages which sequentially output scan pulses. At least one stage includes a pull-up switching element, a pull-down element, and a node controller(Nc). The pull-up switching element is turned on/off according to a logical state of a first node(n1) and outputs clock pulses as the scan pulses when the logical state is turn on. The pull-down element is turned on/off according to a logical state of a second node(n2) and outputs voltages for discharge when the logical state is turn on. The node controller controls the logical state of the first node using a first charge voltage source(VDD1) and the logical state of the second node using a second charge voltage source(VDD2) different from the first charge voltage source.