On an interlaced display, the two different fields are not displayed at the same time. If you merge the two fields into a single non-interlaced frame and displa

On an interlaced display, the two different fields are not displayed at the same time. If you merge the two fields into a single non-interlaced frame and display it on a progressive scan display you might see a double image, but that's not inherent to interlaced video.