A display device is provided to improve the compatibility of a driving IC by equipping voltage converting unit for controlling the driving IC by the characteristics of the display panel material. A driving IC(200) generates the driving signal for being electrically connected with the display panel and controlling the display panel. A voltage change part controls the driving IC in order to generate the driving signal corresponding to the material characteristic of the display panel(300). A first substrate has the thin film transistor electrically connected to the gate wiring, formed into the first direction data line formed into the backward intersecting toward the first direction, and the gate and data line and the pixel electrode electrically connected with the thin film transistor. A second substrate has the common electrode formed in the substrate top area. A liquid crystal layer is interposed between the first and the second substrate.
