Design of Input Output Pad ESD Protection in TFT LCD Drive Chip
This paper describes the layout of TFT LCD drive chip ESD protection.It mainly analyzes and designs ESD protection for Input Output pin in TFT LCD drive chip.Triangle shaped arrangement in two line ESD circuit is adopted to make the electric current pass equably.In the Input protected circuit,two level protection circuits are used.The first circuit absorbs main electric current,and the secondary circuit absorbs remaining ESD charge.Grid Coupling ensures linear fingers trigger.In the Output protected circuit,CMOS structure is used.NP point separating resolve the problem of instant lead.Input/Output PAD ESD protected circuit include input and output pad ESD protected circuit structure.