The
Interactive Graphics Display consists of three main components:Frame Buffer or Digital Memory
Monitor
Display Controller
The
image is stored in frame buffer in the form of binary numbers which represents
as a arrary of picture elements or pixels. For example, where you want to store
only black and white images, so you can represent black pixels by 1's and white
pixels by 0's in the frame buffer. There for an array of black and white pixels
of size 16 X 16 could be represented by 32 bytes, stored in a digital memory as
shown in figure below:
After
that display controller reads each byte of data from buffer and converts its
o's and 1's into the corresponding video signals. Then these signals are fed
into the monitor which produced black and white images on the screen. Display
controller repeats this operation thirty times per second to maintain steady
picture on the screen. If you want to change the image, then you need to modify
the frame buffer contents to represent the new pattern of pixels.
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