The width W3 of the fifth region 210b of the first electrode unit 210 in the second axis (Y) direction may be within a range of about 2/10 to about 3/10 of the width W1 of the first region 210a of the first electrode unit 210 in the first axis (X) direction. For example, the width W3 of the fifth region 210b of the first electrode unit 210 in the second axis (Y) direction may be about 0.24 mm to about 0.36 mm, but is not limited thereto. When the width W3 of the fifth region 210b in the second axis (Y) direction is less than 2/10 of the width W1 of the first region 210a in the first axis (X) direction, a width of a lead electrode may be narrowed, and resistance may increase. When the width W3 of the fifth region 210b in the second axis (Y) direction is more than 3/10 of the width W1 of the first region 210a in the first axis (X) direction, the width of the lead electrode may be considerably widened, causing the reduction in thermal dissipation efficiency.