![]() ![]() This period where nothing is being drawn to the screen is called a blank - Hblank = horizontal blank (aka when gun is moving right to left), Vblank = vertical blank (aka when gun is moving bottom to top). While the gun is off, nothing is being drawn to the screen. When It's back into position, it turns back on and begins drawing again. Because it has to move back to the left (or top) of the screen to begin drawing the next line, it turns off while moving right to left (or up to down) temporarily. When it's moving left to right, the gun is on and spraying phosphor onto the screen. It "scans" the image out line by line, going from the left side of the screen, to the right, and from the top of the screen, to the bottom. This process is mechanical - if you were to open up your TV and could shrink down and look inside, you'd physically see the gun moving left and right and up and down. When the electricity touches the glass of your screen, it causes a phosphorescent glow, and that glow is what forms the basis of the image. Old televisions had what was called a phosphor gun that shows a beam of electricity to the screen of your old CRT television. ![]()
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