Horizontal jet return

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In the case of a screen, the horizontal beam return is the "line return" of the electron beam .

In the case of a cathode ray tube screen, the image is built up line by line. When it is finished with one line, it runs back to the page from which it started and begins with the next line. This return is known as the horizontal jet return.

If the screen is now finished with the construction of the whole picture, then it runs back up and starts its work from the beginning. This return upwards is called vertical beam return (see also VSync ).

Use

While the graphics card is sending data to the screen for display, you cannot write to the graphics memory. With a horizontal beam return, however, no data need to be sent. During this time, the graphics card releases the graphics memory for writing or reading. This short time can be used to update the data.