Patent ID: 7517464
Filing Date: 2009-04-14
Classification: G02F,H01L

Abstract:
1. A method for manufacturing a liquid crystal display (LCD) device comprising: consecutively forming a semiconductor layer and a multilayer metallic film to overlie a substrate, said multilayer metallic film including a high-melting-point metal (HMPM) film and a first metallic film having a lower resistivity than said HMPM film, wherein the first metallic film comprises an Al or Al-alloy film; forming a photoresist mask on said multilayer metallic film; patterning said multilayer metallic film by using said photoresist mask to form a multilayer metallic pattern, said patterning including a side etching for retracting edges of said multilayer metallic pattern beyond edges of line patterns of said photoresist mask; forming a protection film after said patterning comprising at least one of Al oxide or Al hydroxide on exposed portions of said first metallic film by hot-water washing; dry-etching at least a portion of said semiconductor layer after forming said protection film by using said photoresist mask as an etching mask; and removing said photoresist mask, wherein said patterning step includes wet etching.