alicabang :
yes, it is possible. i just upgraded mine from 1366x768 to 1920x1080. as long as it has the 30-pin connector. only the touch screen Full HD model uses 40-pin. non touch models with HD and Full HD screens are both using 30-pin connector.
Alicabang Does your Inspiron 15 have the i5 in it? how was the upgrade to the screen? just plug and play from the old 768p screen to the 1080p screen? I am planning to change my screen too but am worried that the screen might not work when I change it to the 1080p one. Your answer will be a big help, Thank you.