Very often the number of pixels is mixed up with “resolution”. Microlenses can be added to a pixel to better focus the light onto the photosensitive regions improving the fill factor.Ī complete digital imaging sensor consists of millions of pixels organized in a geometrical array. The fill factor of an image sensor describes the relation of a pixel’s light-sensitive area to its overall area. The size of pixels typically varies between 2-24 µm² for microscopy imaging sensors.ĭue to typical pixel architectures, not the entire surface of a pixel is photo-sensitive. As a rule of thumb the pixel size defines the number of electrons which can be collected without saturating a pixel. The charge generated in a pixel is directly proportional to the number of photons striking the sensor, which is typically influenced by the duration of light exposure ( integration time), the detected wavelength and most importantly the light intensity.
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