Definitions of 1080 p, p, and other HD resolutions

The resolution type of the video output is listed here. It is a note. Please correct the incorrect content.

P: Row-by-row scan, progressive
I: interlace Scan

Name frequency Description resolution description
525 I 60Hz, 483 vertical scanning lines, 640 visible vertical scanning lines 480 X D1 standard ntsc TV display mode
480 P 60Hz, 525 lines of vertical scanning lines, 483 lines of visible vertical scanning lines, 640x480 D2 standard TV NTSC-based edtv, the same specification as the row-by-row scanning DVD
576i 50Hz line separation, 625 vertical scanning lines, 576 visible vertical scanning lines 720x576
Standard pal TV display mode, domestic TV Standard
720 p 60Hz line by line, 750 vertical scanning lines, 720 visible vertical scanning lines 1280x720 D4 standard digital TV display mode
1080i 60Hz, 1125 vertical scanning lines, 1080 visible vertical scanning lines, 1920x1080 D3 standard digital TV display mode
1080 p 60Hz line by line, 1125 vertical scanning lines, 1080 visible vertical scanning lines 1920x1080 D5 standard digital TV display mode

The physical resolution is 1920 × 1080, which is the full-hd TV, which is generally advertised as full-HDTV.
Generally speaking, P is an entry-level HD resolution, but its clear effect is already very good, so P is also regarded as a HDTV.

Let's talk about TV signals and CRT TVs:
Domestic TV signals are paled, and an image can be regarded as composed of 625 rows of horizontal lines.
During the transmission of TV signals, due to bandwidth restrictions, it is only possible to transmit the line signal to save bandwidth.
If the TV is scanned in the same line, it will take two times to display a complete image. That is to say, it will be divided into two sets, with 312.5 rows scanned each. The TV usually displays 50 fields per second, that is, the field frequency is generally 50Hz. In this way, the field frequency can be displayed (625/2) x50 = 15625 lines per second. This is generally the line frequency, generally, it is called the 15 K pal line frequency,
If the TV shows 100 rows in one second, if it is still a line scan method, you can see that the number of lines displayed per second is twice that of the original, that is, 31250, or 31 K line frequency. The critical blinking frequency of the human eye is 60Hz, so that the Hz frequency gives people the feeling that the picture is very stable, but it is still a line scan, the scanning line is still very obvious, therefore, the image is still not delicate enough. This is what we generally call "100Hz, which is healthy if it is not flashing". This mainly refers to meeting the critical blinking frequency of the human eye, But the definition is still not enough.

If the TV is scanned at 60Hz +, the screen will be stable and delicate. 31250 = (?) X 60 indicates that the number of rows scanned by line is 520 rows. Therefore, you need to reduce the number of rows in the original TV screen by 625 to about 100 rows, although the image content is lost, the effect is much better than other situations.

So if the TV is a 720 p @ 60Hz digital TV, it is 60Hz, no flash, and it can reach 43200 lines, that is, the line frequency is, it is higher than the average TV signal source of 625 lines, so the representation of the original screen is enough, but there are more than 720 lines, which leads to the appearance of the screen is not natural when watching the TV signal.

Let's talk about the digital signal:
TV signal source, which is expressed in pixels or resolutions. It is a pallike program with a resolution of 720x576. In this case, it is not enough to display 720 p on a 1280 p TV, that is, 720 x P.

Generally, a DVD is a digital signal with a x screen resolution. It is sufficient to use a p TV. 480p is not suitable.

Although the 1080i can provide a higher pixel (2.07 million), it is much higher than 0.92 million of the 720p, but the image stability is P.
If you want to see the real high-definition effect, you have to go one by one, that is, p is the real high-definition number.

This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/mimepp/archive/2007/08/25/1759136.aspx