Image sensors and optical devices

Which correctly describes dark current in an image sensor?

  1. AA signal current that increases in proportion to light intensity
  2. BCurrent that flows even without light, and increases with temperature
  3. CA clock current for reading out pixels
Show answer and explanation

Answer: B. Current that flows even without light, and increases with temperature

Dark current is the current caused by charge generated thermally in the photodiode even when no light falls on it. It causes noise in low-light shooting and long exposures, and it increases with temperature. It can be reduced by reducing crystal defects and interface states.

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