HDTV short for High Definition Television is a latest technology that provides best resolution. The first high definition television was set in the market in 1998. HDTV is basically renowned as a digital video broadcast with 1280 x 720 pixels minimum resolution. It provides good rate i.e. 30 frames per second with 16:9 aspect ratio. A standard television uses cathode ray tube that uses an electron gun to guide the path of electronic beam to paint 480 vertical lines on the screen. On the other hand, HDTV plasma or liquid crystal displays (LCD) to illuminate million tiny dots across the screen. HDTVs are available in different aspect ratios. This document explains these different varieties in detail. Digital Image Processing circuitry is used to process interlaced TV signals, upscale the image size and convert the input to 60 frames per second. The document clarifies the different available sizes and power consumption rates of HDTVs.