Define frame buffer. What is the role of frame buffer in display?
The screen image can be thought of as a two-dimensional grid of pixels. The picture is shown by a raster system by drawing pixels in a row by row fashion from left to right. The image definition is saved in a memory known as the refresh buffer or frame buffer. The scene to be presented is initially loaded into the frame buffer as intensity values. The frame buffer should ideally be the same size as the screen resolution. The intensity value from the frame buffer’s top left location is obtained and painted at a top-left spot on the screen. Soon after, the second pixel of the same row is painted, and the procedure is repeated. Frame buffers in raster displays hold individual pixels of the scene, whereas frame buffers in random scan displays store commands for rendering the scene. Resolution in computer graphics refers to number of pixels, where as frame buffer refers to memory to hold the information for those pixels.
