The Note
- a solid-state device is used
- its faceplate is made up of an array of silicon photodiods mounted on a chip, typically 7 mm diagonal arranged in lines and columns
- 750 diods per line and 575 rows
- each reversed-biased diode acts as a capacitor and acquires an electrical charge proportional to the amount of light falling on it
- the charges on the top line are read out first from left to right
- each line is read out in turn progressing downwards until the end of the bottom is reached in 20 ms (millisecond, 0.001 second)
- the first vertical scan involves every other line in the diode matrix, nos 1, 3, 5 and so on
- then finally the entire picture has been scanned in two consecutive sweeps taking a total of 40 ms
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