EOS HD
Two dedicated circuits are provided for each pixel. a circuit for low ISO, another circuit for high ISO. It switches the circuit, instead of just applying a gain. This is used in Sony and Aptina sensors.
sensorworld
sony patent US 20170148832
abstract: Imaging sensors, imaging apparatuses, and methods of driving an image sensor are provided. An image sensor can include a semiconductor substrate with a photoelectric conversion element and a charge-conversion element. The sensor can further include a capacitance switch. A charge accumulation element is located adjacent the photoelectric conversion element. At least a portion of the charge accumulation element overlaps a charge accumulation region of the photoelectric conversion element. The charge accumulation element is selectively connected to the charge-voltage conversion element by the capacitance switch.
In order to increase the dynamic range of a pixel, it is desirable to increase a difference between high level and low level of conversion efficiency in the pixel.
I think it should be better termed as "on-chip dual ISO amplifier"
留言
張貼留言