At [[Pixel Saturation|saturation]], any additional charge to pixels may spread into neighboring pixels. This phenomenon is called blooming and is visualized as a white streak or blob in the image.
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Antiblooming structures can be incorporated into the sensor design to reverse these effects. The most common types are fixed and gated. Fixed antiblooming structures include a drain that runs next to the pixel with a barrier between pixel and drain. When the charge overflows, it will flow into the drain instead of neighboring pixels. In gated antiblooming structures a gate system controls the opening or closing of a barrier. If open, the gate allows additional charge in the pixel to flow into the drain.
https://www.princetoninstruments.com/learn/camera-fundamentals/full-well-capacity-pixel-saturation ^Ref-1