An etchant for forming double-layered signal lines and electrodes of a liquid crystal display device includes hydrogen peroxide (H2O2), a phosphate, F-ions, an organic acid having a carboxyl group (—COOH), a copper (Cu) inhibitor, and a hydrogen peroxide (H2O2) stabilizer, wherein each of the double-layered...http://www.google.se/patents/US7977128?utm_source=gb-gplus-sharePatent US7977128 - Etchant for etching double-layered copper structure and method of forming array substrate having double-layered copper structures
