The Digital HDTV Grand Alliance established this technique in 1990s in the US of An initially. It's specified as 1080 active lines, 16 x 9 aspect ratio in ITU-R BT.709.

High defintion television refers to screen of widescreen pictures with good particulars and sharpness than seen in usual analog television, or some another techie Televisions formats. But the truth is that it is the perfect quality Digital Television screen format around.

High defintion TV is accessible in rear screen, direct-view, plasma, and front screen projection. High defintion TV can be observed by HDTV tuner and 1080i is the most specified HDTV format.