VESA video signal analysis

VESA (Video Electronics Standards Association) refers to the Video Electronics Standards Association, which specifies the display monitor timing standards of various resolutions and refresh rates of the computer (VESA) standard (referred to as VESA standard).

(Timing parameter of video signal) = 640* 350 @85H 640* 350 refers to the image resolution of one frame (that is, one piece);
640 refers to the number of effective pixels in each row of pixels is 640;
350 refers to a The number of effective video lines in an image is 350 lines;
85Hz refers to scanning a frame of image at a frequency of 85Hz.
(Pixel Clock) refers to the time required to scan a pixel;
(horizontal scanning frequency) refers to the reciprocal of the time required to scan a row of pixels;
reasonably deduce Hor Frequency = Pixel Clock * total pixels of a row Number of points;
Hor Frequency = 1/ ((1/31500000) * 832 ) = 37860 .5769Hz = 37.861KHz
(vertical scanning frequency), which refers to the reciprocal of the time required to scan the pixels of a frame of image, which is the aforementioned A frame of image is scanned at a frequency of 85Hz.
Reasonable derivation of Ver Frequency = Pixel Clock * total number of pixels in a line * how many lines there are in total
Ver Frequency = 1/ ((1/31500000) * 832 *455) = 83.210 Hz It seems that there is an error
(horizontal/vertical sync polarity)
personally Understanding is the ratio of Hor/Ver Blank Time (horizontal/vertical blank time) in the horizontal/vertical to the total horizontal/vertical time;
It refers to the number of pixels in the middle interval after the effective pixels of the previous line end before the arrival of the horizontal synchronization signal (this Front is relative to Hor Sync Time); H Back Porch is the arrival of the next effective pixel after the arrival of the horizontal synchronization
signal Front, interval pixels;
H Right Border refers to the pixels contained in the right border of the horizontal effective pixels, generally 0, only 8 in 640 x 480 @ 60Hz and 640 x 480 @ 72Hz in the entire VESA video format specification.
H Left Border refers to the pixels contained in the left border of the horizontal effective pixels