A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately:

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UGC NET Computer Science (Paper 2) July 2018 Paper

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Answer 1

Data:

Frame buffer width = 640 pixels

Height = 480 pixels

Color depth = 1 bit per pixel

Access time for each pixel = 200 ns

Calculation:

Frame buffer size (in bits) = 640 × 480 × 1 = 307200 bits

Access time for 307200 bits (1 frame) = 307200 × 200

= 61440000 ns = 0.06144 seconds

As, 0.06144 seconds makes = 1 frame

1 seconds makes = 1/0.06144 = 16.27604166 frames

So, refresh rate = 16. 27604166 frame per sec (approx. 16 frames per sec)