Circuit board and display device including the same

Abstract

A circuit board includes a board, first connection pads disposed on the board and arranged in a first direction, second connection pads disposed on the board and arranged in the first direction, the second connection pads spaced apart from the first connection pads in a second direction perpendicular to the first direction, and a driving chip disposed on the board between the first connection pads and the second connection pads. Each of the first connection pads includes a first conductive layer disposed on the board, a second conductive layer which entirely overlaps with the first conductive layer in a plan view, is disposed on the first conductive layer and is formed of a different material from that of the first conductive layer, and a third conductive layer entirely overlapping with the second conductive layer and disposed on the second conductive layer.

What is claimed is: 
     
         1 . A display device comprising:
 a display module comprising: a base substrate including a display area and a non-display area adjacent to the display area; and pads overlapping with the non-display area and disposed on the base substrate; and   a circuit board comprising: a board; and connection pads disposed on the board and being in contact with the pads, respectively,   wherein each of the connection pads comprises:   a first conductive layer disposed on the board;   a second conductive layer which overlaps with the first conductive layer, is disposed on the first conductive layer and has a different material from that of the first conductive layer; and   a third conductive layer which overlaps with the second conductive layer, is disposed on the second conductive layer and is in contact with a corresponding one of the pads.   
     
     
         2 . The display device of  claim 1 , further comprising:
 a resin disposed between the base substrate and the board and surrounding the pads and the connection pads.   
     
     
         3 . The display device of  claim 1 , wherein at least a portion of the second conductive layer is in contact with the corresponding pad. 
     
     
         4 . The display device of  claim 1 , wherein the second conductive layer entirely overlaps with the first conductive layer, and the third conductive layer overlaps with at least a portion of the second conductive layer. 
     
     
         5 . The display device of  claim 1 , wherein each of the pads comprises:
 a first driving conductive layer disposed on the base substrate;   a second driving conductive layer disposed on the first driving conductive layer; and   a third driving conductive layer disposed on the second driving conductive layer and being in contact with the third conductive layer.   
     
     
         6 . The display device of  claim 5 , wherein a material of the first driving conductive layer and a material of the third driving conductive layer are the same, and
 wherein a thickness of the second driving conductive layer is greater than a thickness of each of the first and third driving conductive layers.