The defination of 1080p and 720p?

Release time:2017-04-27 | Article source:

720p, made by SMPT Society of Motion Picture and Television Engineers,

is a format standard for high-grade HDTV .  It refers to a progressive HDTV signal with 720 horizontal lines and an aspect ratio of 16:9 .

Each frame is displayed in its entirety on screen for 1/30th of a second.

This is know as progressive scan (hence the 'p').

A 1080i signal comprises 1080 horizontal lines but all the lines are not displayed on

screen simultaneously. Instead, they are interlaced (hence the 'i'), ie. every other lines is displayed

for 1/60th of a second and then the alternate lines are displayed for 1/60th of a second.