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Image sensor and electronic camera

專利號
US11039093B2
公開日期
2021-06-15
申請人
NIKON CORPORATION（JP Tokyo）
發(fā)明人
Atsushi Komai
IPC分類
H04N5/347; H04N5/374
技術(shù)領(lǐng)域
pixel,signal,pixels,vertical,unit,vl1,in,vl2,first,electric
地域： Tokyo

摘要

An image sensor, includes: a plurality of pixels arranged along a first direction, each of which includes a photoelectric conversion unit that generates an electric charge through photoelectric conversion of light, and outputs a signal generated based upon the electric charge generated in the photoelectric conversion unit; a first signal line to which signals from one or more pixels among the plurality of pixels are output; a second signal line to which a signal from another pixel among the plurality of pixels is output; and an arithmetic unit that executes an arithmetic operation with a signal generated by combining the signals from the one or more pixels output to the first signal line and the signal output to the second signal line.

說明書

As explained earlier, in the second control mode, the electric current from the first electric current source 25 is shunted and flows to the pixel 10 (1, 1) and the pixel 10 (3, 1) as separate electric currents in correspondence to the voltages at the FDs 14 in the pixel 10 (1, 1) and the pixel 10 (3, 1). In the example presented in FIGS. 4(a) and 4(b), VfdA is greater than VfdC, and thus, IdA is greater than IdC. In addition, the electric current from the second electric current source 26 flows in its entirety to the pixel 10 (2, 1) at the central position in the second control mode. As explained earlier, the levels of the electric currents (electric current values) provided from the first electric current source 25 and the second electric current source 26 are substantially equal to each other. For this reason, the ratio of IdA, IdB and IdC will change within the range of 1:1:0 through 0:1:1. Accordingly, since IdA or IdC can never exceed IdB, a sum pixel signal with a weight applied to the pixel 10 (2, 1) at the center can be obtained.

In contrast, pixel signals from the three pixels 10 (1, 1), 10 (2, 1) and 10 (3, 1) are combined at the first vertical signal line VL1 in the comparison example. Namely, the first selection units 16 are all set in an ON state and the second selection units 17 are all set in an OFF state in the three pixels 10. A voltage Vout of the signal generated by combining the pixel signals from the pixels 10 (1, 1), 10 (2, 1) and 10 (3, 1) in this situation can be expressed as in (9) and (10) below.
Vout=(VfdA+VfdB+VfdC)/3?Vth?(?)√(Δov2?ΔVfd32)??(9)

權(quán)利要求

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