Pixel clock

The pixel clock (dot clock) indicates how many pixels per second are sent to a monitor . The inactive (i.e. invisible) pixels within the horizontal and vertical blanking intervals are also counted. It is calculated from the product of the number of transmitted pixels per image and the frame rate , or from the product of the total horizontal number of pixels and the line frequency . ${\displaystyle f_{Px}}$ ${\displaystyle N}$ ${\displaystyle f}$

Example:

Anzahl der sichtbaren horizontalen Pixel (Spalten):  ${\displaystyle N_{h}=1024}$
Anzahl der sichtbaren vertikalen Pixel (Zeilen):     ${\displaystyle N_{v}=768}$
Bildwiederholrate:                                   ${\displaystyle f=60\,\mathrm {Hz} }$

Assuming that the visible pixels make up 80% of the transmitted pixels, the following applies:

${\displaystyle N=N_{h}\cdot N_{v}\cdot {\frac {100\,\%}{80\,\%}}}$

and the pixel clock is calculated as follows: ${\displaystyle f_{Px}=N\cdot f}$

${\displaystyle f_{Px}=N_{h}\cdot N_{v}\cdot {\frac {100\,\%}{80\,\%}}\cdot f=1024\cdot 768\cdot {\frac {100\,\%}{80\,\%}}\cdot 60\,\mathrm {Hz} =58{,}98\,\mathrm {MHz} }$

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