Progressive scan

[1] The system was originally known as "sequential scanning" when it was used in the Baird 240 line television transmissions from Alexandra Palace, United Kingdom in 1936.

The images in the center column precisely duplicate the pixels of the ones on the left, but interlacing causes details to twitter.

Real interlaced video blurs such details to prevent twittering, but as seen in the pictures of the lower row, such softening (or anti-aliasing) comes at the cost of image clarity.

Progressive scan was included in the Grand Alliance's technical standard for HDTV in the early 1990s.

The disadvantage of progressive scan is that it requires higher bandwidth than interlaced video that has the same frame size and vertical refresh rate.

With progressive scan there is no need to introduce intentional blurring (sometimes referred to as anti-aliasing) to reduce interline twitter and eye strain.

Progressive scan also offers clearer and faster results for scaling to higher resolutions than its equivalent interlaced video, such as upconverting 480p to display on a 1080p HDTV.

Deinterlacing can result in noticeable visual artifacts and/or input lag between the video source and the display device.