A display device is disclosed, which comprises: a first substrate; a first insulating layer disposed on the first substrate; a second insulating layer disposed on the first insulating layer; and a patterned metal layer disposed on the second insulating layer and comprising plural conductive lines, wherein an opening region is located between two adjacent conductive lines to expose the second insulating layer, and a thickness of the second insulating layer under the conductive lines of the patterned metal layer is larger than that exposed from the opening region.