The only way to know for sure is to count the pixels on the panel itself.
But since this is impractical, all you have to do is read the specs published by the manufacturer.
Tingin ka lang sa brochure nila o sa internet, malalaman mo na. Pag sinabing 1920 x 1080, e di full HD na 'yon. Wala pa naman akong nabalitaan na manufacturer na nagsinungaling sa specs niya.
![Wink ;)](https://www.pinoydvd.com/Smileys/default/wink.gif)
According to the Regza's brochure, only the 47 incher is 1920 x 1080; all the other sizes are 1366 x 768.