SOLID-STATE IMAGING DEVICE AND SIGNAL PROCESSING METHOD
To provide a solid-state imaging device and a signal processing method that can solve delay due to analog gain switching using an imaging element which expands a dynamic range.SOLUTION: In a solid-state imaging device, an AD conversion circuit 220 comprises: a ramp signal generating circuit 221; a c...
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Main Authors | , |
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Format | Patent |
Language | English Japanese |
Published |
06.05.2022
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Subjects | |
Online Access | Get full text |
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Summary: | To provide a solid-state imaging device and a signal processing method that can solve delay due to analog gain switching using an imaging element which expands a dynamic range.SOLUTION: In a solid-state imaging device, an AD conversion circuit 220 comprises: a ramp signal generating circuit 221; a comparator 223; and a switch 222. The comparator 223 compares a pixel signal of a signal voltage Vin depending on an incident light amount of a sensor pixel with a ramp signal selected by the signal voltage Vin, of a plurality of ramp signals VrefH and VrefL generated by the ramp signal generating circuit 221. A counter 224 counts a period up to a comparison end, and stores it in a memory 226.SELECTED DRAWING: Figure 3
【課題】ダイナミックレンジを拡大する撮像素子で、アナログゲイン切り替えによる遅延を解決可能な固体撮像装置および信号処理方法を提供する。【解決手段】固体撮像装置において、AD変換回路220は、ランプ信号生成回路221、比較器223及びスイッチ222を有する。比較器223は、センサ画素の入射光量に応じた信号電圧Vinの画素信号と、ランプ信号生成回路221が生成する複数のランプ信号VrefH,VrefLのうち、信号電圧Vinにより選択されたランプ信号とを比較する。カウンタ224は、比較終了までの期間をカウントし、メモリ226に記憶する。【選択図】図3 |
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Bibliography: | Application Number: JP20200175867 |