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US 2018/0020176 A1Published application
Pixel signal readout device, method thereof, and cmos image sensor including the same
AssigneeSK hynix Inc.
InventorTae-Gyu KIM
Life of this patent
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Abstract
A pixel signal readout device includes a unit pixel including a drive transistor and a reset transistor; and a column select transistor suitable for outputting a voltage applied to one terminal thereof, to a common terminal of the drive transistor and the reset transistor through the other terminal thereof, in response to a column select control signal applied to a gate terminal thereof.
Claims20
A pixel signal readout device comprising:
- a unit pixel including a drive transistor and a reset transistor;
- and
- a column select transistor suitable for outputting a voltage applied to one terminal thereof, to a common terminal of the drive transistor and the reset transistor through the other terminal thereof, in response to a column select control signal applied to a gate terminal thereof.
A pixel signal readout method comprising:
- resetting a photodetector;
- performing photoelectric conversion by the photodetector;
- forming a diode connection by a drive transistor with respect to an output node depending on an operation of a column select transistor when resetting a floating diffusion node coupled to the drive transistor;
- extracting a threshold voltage of the drive transistor;
- compensating for the extracted threshold voltage by transferring photocharges by the photodetector to the floating diffusion node;
- and
- reading out as the compensated threshold voltage as a pixel signal.
4 more elements
A complementary metal oxide semiconductor (CMOS) image sensor comprising:
- a pixel array suitable for outputting pixel signals corresponding to incident light by using a plurality of unit pixels each of which includes a drive transistor and a reset transistor;
- and
- a plurality of column select transistors each suitable for outputting a voltage applied to one terminal thereof, to a common terminal of the drive transistor and the reset transistor of a corresponding column through the other terminal thereof, in response to a column select control signal applied to a gate terminal thereof.
Dependencies are inferred from the claim text.