Driving chip package, display device including the same, and method of testing driving chip package

A display device comprising:

• a display panel including a substrate and a pixel array for displaying an image;
• a printed circuit board (PCB) configured to generate driving signals and control signals that drive and control the display panel;
• and
• a plurality of driving chip packages electrically connected to the display panel and to the PCB, wherein each of the plurality of driving chip packages includes:
• a base film made of an insulating material;
• a plurality of interconnection lines formed on the base film, the interconnection lines including input interconnection lines that conduct externally processed driving signals to a driving chip and output interconnection lines that output the driving signals processed in the driving chip;
• and
• at least one test signal interconnection lines formed on the base film parallel to the plurality of interconnection lines,
• the test signal interconnection lines are not connected to the driving chip and having a test signal input interconnection line and a test signal output interconnection line.

A method of testing a driving chip package, comprising:

• providing a display panel, a printed circuit board (PCB) configured to generate driving signals and control signals that drive and control the display panel, and at least one driving chip package that electrically connects the display panel to the PCB and has at least one test signal interconnection line.
• transmitting a predetermined test signal to a first test signal interconnection line of the at least one driving chip packages;
• conducting the predetermined test signal through a second test signal interconnection line electrically connected to the first test signal interconnection line through a short-circuited interconnection line formed on the display panel;
• and
• determining whether the test signal is detected through a second test signal interconnection line.