An IC chip 2 having a plurality of electrode pads having different areas is directly mounted on a plurality of wiring patterns on a film substrate 4 which are connected to a liquid crystal panel 1 so that a plurality of electrode pads 3 on the IC chip 2 are electrically connected to the plurality of wiring patterns 5, respectively. The width of each wiring pattern 5 is defined in accordance with the size of each wiring pad (i.e. length of the wiring pattern 5 crossing the electrode pad 3) so that the contact area Sn (=Wn×Ln) between each electrode pad 3 and the corresponding wiring pattern 5 is kept constant. In this configuration, a liquid crystal (LC) display device with great reliability can be obtained in which each electrode pad of the IC chip is stably electrically-connected to the corresponding unstable wiring pattern as in a COF type display device.