A display device integrated with a touch screen panel includes upper and lower substrates; the upper substrate comprising a major surface; a display area and a non-display area next to the display area when viewed in a viewing direction perpendicular to the major surface; and a sealing material formed between the upper and lower substrates and in the non-display area when viewed in the viewing direction. The display further includes a sensing cell structure formed over the upper substrate and in the display area; conductive lines formed over the upper substrate and in the non-display area, and connected to the sensing cell structure. The conductive lines overlap with the sealing material; and an optical layer is formed between two immediately neighboring conductive lines among the conductive lines.