Toshiba BC Series Instruction Manual page 11

[Phenomena specific to CMOS sensor]
Defective pixels

A CMOS image sensor is composed of photo sensor pixels in a square grid array. Due to
the characteristics of CMOS image sensors, over- or under-driving of the pixels results in
temporary white or black areas (as if these are noises) appearing on the screen. This
phenomenon, which is not a defect is exacerbated under higher temperatures and long
exposure time.
Image shading

The brightness of the upper part of the screen may be different from that of the lower part. Note
that this is a characteristic of a CMOS image sensor and is not a fault.
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