Patent ID: 7550183
Filing Date: 2009-06-23
Classification: C09K,C23F,G02F,Y10S

Abstract:
1. A method for manufacturing a conductive element substrate comprising: (a) a laminated conductive film formation step of sequentially forming a first conductive metal film which is made of one or more metal layers and a second conductive metal film which is lower in etch rate than the first conductive metal film on a substrate to form a laminated conductive film; and (b) a conductive element formation step of patterning the laminated conductive film into a conductive element, wherein in the step (b), the laminated conductive film is etched at least twice using different etchants such that the second conductive metal film becomes narrower than the first conductive metal film when viewed in cross section, thereby making the cross section of the laminated conductive film substantially tapered upward from the closest conductive metal film to the substrate, wherein the step (b) includes a first etching step of etching the first conductive metal film and the second conductive metal film simultaneously and a second etching step of etching the second conductive metal film only, said first and second etching steps being performed using a single masking pattern, wherein the second conductive metal film is an amorphous transparent conductive film, made of a compound of indium oxide and zinc oxide and etched with an aqueous oxalic acid solution in the second etching step.