Glass substrate and its manufacturing method for a flat panel display

The present invention provides a glass substrate and flat panel display for flat panel displays to achieve both low thermal shrinkage and devitrification suppression. Flat panel glass substrate for displays according to the invention, by mol%, SiO Al B MgO 0 super to 15%, CaO 0~20%, SrO 0~15%, BaO 0~10%, Contain, Molar ratio The molar ratio MgO / RO is in the range of 0.15 to 0.9, Devitrification temperature is less than 1280 ℃, Heated at 10 ° C. / min from room temperature, held for 2 hours at 550 ° C., then, 10 ° C. / min heat shrinkage represented by the following formula after cooling to room temperature is less than 75ppm than 3 ppm. Heat shrinkage (ppm) = {before and after heat treatment of the glass amount of shrinkage / length of the glass before heat treatment} × 10