Patent ID: 8987060
Filing Date: 2015-03-24
Classification: H01L,H05K,Y10T

Abstract:
1. A method for making a circuit board, comprising: providing a first substrate and a second substrate, wherein said first substrate comprises a release film which is attached to a carrier, and said second substrate comprises a copper film which is covered with a first solder mask; patterning said first solder mask; pressing said release film and said patterned first solder mask together so that said first substrate is attached to said second substrate; patterning and removing said copper film to simultaneously form a first pattern, a die pad and a second pattern, wherein said first pattern is in direct contact with said release film and said second pattern is in direct contact with said patterned first solder mask; forming a second solder mask which selectively covers said second pattern and exposes said first pattern; and using said second solder mask as a mask to form a protective layer only covering said first pattern and said die pad, thereby forming a circuit board structure.