![]() First is horizontal retracing and second is vertical retracing. In Frame Buffer the positions are called picture elements or pixels. Raster Scan provides a refresh rate of 60 to 80 frames per second.įrame Buffer is also known as Raster or bit map. The raster scan system can store information of each pixel position, so it is suitable for realistic display of objects. Televisions in our house are based on Raster Scan Method. Information of on and off pixels is stored in refresh buffer or Frame buffer. Random-Scan monitors cannot display realistic shades scenes.Ī Raster Scan Display is based on intensity control of pixels in the form of a rectangular box called Raster on the screen.A CRT has the electron beam directed only to the parts of the screen where an image is to be drawn. ![]() Random-scan monitors are also known as vector displays or stroke-writing displays or calligraphic displays. The system cycles back to the first line and design all the lines of the image 30 to 60 time each second. Each line segment is drawn on the screen by directing the beam to move from one point on the screen to the next, where its x & y coordinates define each point. The picture is constructed out of a sequence of straight-line segments. ![]() Random Scan System uses an electron beam which operates like a pencil to create a line image on the CRT screen. Next → ← prev Random Scan and Raster Scan Display: Random Scan Display: ![]()
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