Tuners aside there is still a distinct difference, between a computer display and a HDTV. When the PC just got started (or an Apple) you could use a TV as a monitor, but they quickly learned that interlaced tubes are terrible for reading text, so progressive scan displays became the norm, so along came VGA which has the same resolution as an SDTV; 640×480, but progressive. This obviously wasn’t enough and NEC released the first multiscan display that supported multiple resolutions. (I am drastically simplifying this time line) Next came flat panel displays that were fixed pixels so they used scallers to emulate the multiscan functionality (this is why LCD monitors almost never look great unless they are set to their native resolution). Early CRT based HDTVs were also multiscan; supporting 480i, 480p and 1080i (yes all natively). Before the days of widescreen, both TVs and computer monitors had a 4:3 aspect ratio, but what many don’t realize is that HDTV and widescreen computer monitors are not both 16:9, while HDTVs are 16:9 most widescreen computer monitors are 16:10 and HDTVs are usually either 1280×720 or 1920×1080 — widescreen computer monitors are usually 1440×990 or 1680×1050, but of course there are many more 16:10 resolutions supported and some aren’t really 16:10 because the pixels are not always square.