Display panel, display device and manufacturing method the same

A display panel, a display device and a manufacturing method thereof are provided to use an electrode of the display device as a polarizing panel, thereby removing the polarizing panel arranged at the rear of the display panel and simplifying the processes. A gate line is formed on a substrate. A gate insulating layer is formed on the substrate to cover the gate line. A data line is crossed with the gate line and includes a source electrode. A drain electrode(175) is located oppositely to the source electrode. Plural line patterns(193) are electrically connected with the drain electrode and polarizes the incidence light beam. The distance of line patterns is below 200 nanometer. The width of the line pattern is below 100 nanometer. An alignment layer is formed on the electrode. The electrode includes at least one among Al, Ag, Cu, Mo, Cr, Ta, Ti or alloy thereof. The gate insulating layer includes an opened pixel area.