Solid-state image device, method of driving solid-state imaging device, and electronic system with AD converter and bias current control

An electronic system comprising:

• a solid-state imaging device including
• a plurality of pixels that respectively include a photo electric converter that converts incident light into a signal and an amplification transistor that amplifies the signal;
• a plurality of vertical signal lines that respectively receive amplified signals from the pixels;
• bias-current control circuitry configured to turn on or off a bias current supplied to the amplification transistor;
• an averaging circuit configured to average the amplified signals from the plurality of vertical signal lines;
• and
• a plurality of analog to digital converters;
• and
• drive control circuitry configured to control the bias-current control circuitry and the analog to digital converters in a first mode and a second mode, wherein in the first mode the drive control circuitry is configured to provide a stop operation to at least one of the analog to digital converters, such that fewer of the analog to digital converters are operational in the first mode as compared to the second mode.

A method of driving a solid-state imaging device including a plurality of pixels respectively having a photo electric converter that converts incident light into a signal and an amplification transistor that amplifies the signal, and a plurality of analog to digital converters, the method comprising:

• receiving, by a plurality of vertical signal lines, amplified signals from the pixels;
• turning on or turning off, by a bias-current control circuitry, a bias current supplied to the amplification transistor;
• averaging, by an averaging circuit, amplified signals from the plurality of vertical signal lines;
• and
• controlling, by drive control circuitry, the bias-current control circuitry and the analog to digital converters in a first mode and a second mode, wherein in the first mode the drive control circuitry is configured to provide a stop operation to at least one of the analog to digital converters, such that fewer of the analog to digital converters are operational in the first mode as compared to the second mode.