As mentioned above, HDTV matches the appearance of movie screens; however, it is an improvement over standard TVs in many more ways...

First, HDTVs use a higher-resolution format of digital television. The signal has twice the color resolution and imports a picture that is six times sharper than analog TVs.

Second, HDTVs improve the audio experience. A lot of the HDTV programming is transmitted in Dolby Digital surround sound, further upgrading the home theatre experience. Plus the sound is CD-quality, meaning digital superiority over the sound of analog TV