Standard Definition: physical resolution of 720p video format. 720p refers to the video vertical resolution of 720 lines progressive scan. Specifically, SD means the resolution about 400 lines of VCD, DVD, TV programs and other "standard definition" video format, the standard definition. While the physical resolution up to 720p or more is known as HD ( High Definition) .On the high-definition standards, internationally recognized there are two standard: video vertical resolution of more than 720p or 1080i; video aspect ratio of 16: 9.
Digital TV (HDTV) 720p, 1080i, and 1080p are high-definition standard formats defined by the Society of Motion Picture and Television Engineers, 1080p called the current top-of-the-line display format for digital televisions in progressive-scan 1920 × 1080 resolution. At present, only the screen size over 60-inch can display the signal 1920 × 1080 resolution. Where I means interlaced scanning, P means progressive scanning. Simply , to show the effect, 1080p> 720p> 1080i. Of course, in 20-inch computer LCD screen, there is no difference.
FHD(Full HD)Full HD: the physical resolution up to 1920 × 1080 display (including 1080i and 1080P), where i (interlace) refers to interlaced; P (Progressive) represents progressive scan, the Fine degree in those two picture has a big difference, 1080P picture quality is better than 1080i. then 720 is called standard HD. Obviously, the 1080 resolution is more advantages in large-screen TV, 1080 to ensure a clearer picture quality, but for small screen size tv, there is no big difference.
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