A window substrate for protecting an electronic display device is disclosed and includes a first glass substrate having a first thickness, a second glass substrate having a second thickness, and an interlayer disposed between the first glass substrate and the second glass substrate, the interlayer having a third thickness, wherein the sum of the first thickness, the second thickness, and the thirdthicknesses is equal to or less than about 190 [mu]m. A display device including a display panel to display an image and a window substrate also is disclosed.