Image sensing device and operating method thereof
AssigneeSK hynix Inc.
InventorsJeong Eun Song, Yu Jin Park, Min Seok Shin
Life of this patent
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Abstract
Disclosed is an image sensing device including a plurality of current cells whose total number to be used is adjusted based on a plurality of enable signals, and which are sequentially controlled based on a reset signal and a plurality of selection signals; a current-voltage conversion circuit suitable for converting a plurality of unit currents, which are supplied from current cells used among the plurality of current cells, into a ramp signal; and a first control circuit suitable for generating the plurality of enable signals based on a maximum conversion code value corresponding to a slope of the ramp signal.
Claims20
An image sensing device comprising:
- a plurality of current cells whose total number to be used is adjusted based on a plurality of enable signals, and which are sequentially controlled based on a reset signal and a plurality of selection signals;
- a current-voltage conversion circuit suitable for converting a plurality of unit currents, which are supplied from current cells used among the plurality of current cells, into a ramp signal;
- and
- a first control circuit suitable for generating the plurality of enable signals based on a maximum conversion code value corresponding to a slope of the ramp signal.
An image sensing device comprising:
- a pixel array suitable for generating a plurality of pixel signals based on incident light;
- a signal converter suitable for generating a plurality of digital signals based on the plurality of pixel signals and a ramp signal;
- and
- a ramp signal generator including a plurality of current cells, and suitable for generating the ramp signal by adjusting the total number of current cells to be used among the plurality of current cells, based on a maximum conversion code value corresponding to a slope of the ramp signal and sequentially controlling the current cells to be used, based on a plurality of selection signals and a reset signal.
An operating method of an image sensing device, comprising:
- emitting emitted light to a subject;
- receiving background light and reflected light, which is reflected from the subject;
- generating a digital signal according to an analog to digital (A/D) conversion range corresponding to a slope of a ramp signal, based on the ramp signal whose slope is adjusted according to a use environment indicating a ratio between the reflected light and the background light and a pixel signal outputted from a pixel array;
- and
- measuring a depth from the subject based on the digital signal.
Dependencies are inferred from the claim text.