What is pixel, and how does it make a difference?

A TV screen is made up of small picture elements known as pixels. Each pixel constitutes three closely spaced dot colors – red, blue and green.

Combined together on the TV’s phosphor screen, and when viewed from a distance, the colors are seen as one.

The pixels in the analog system are slightly taller than their width while in HDTV they are 4.5 times smaller, spaced closer, and square in shape.

This enables HDTV to display 4.5 times more detail than analog television.