HDTV Offer compare and save on a massive range of HD Ready TV's. Lowest price LCD and Plasma HD Ready Televisions. HDTV stands for High Definition Television, and if you have been to the America, Australia, or Japan you may already have experienced it. There are three key differences between HDTV and what's become known as standard definition TV ie regular PAL, NTSC or SECAM. The three differences are; an increase in picture resolution, 16:9 widescreen as standard, and the ability to support multi-channel audio such as Dolby Digital.