Frame buffer is a part of memory for graphics and has the intensity value for all the screen co ordinates. Frame buffer is implemented by shift registers in FIFO (First in First out) fashion. According to the photo info an application program updates frame buffer. Then, the display controller converts the binary values to pixel information which is later displayed in to a Cathode Ray Tube. Frame buffer can be used as a part of computer memory using a common bus or it can be used separately by using host system bus and graphics system bus.