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US 11,122,224 B2Granted
Event-based sensor, user device including the same, and operation method of the same
AssigneeSamsung Electronics Co., Ltd.
InventorsYunjae Suh, Sung Ho Kim, Junseok Kim, Hyunsurk Ryu
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Abstract
An event-based sensor includes a dummy pixel that generates a dark current, a current mirror that generates a mirrored current using the dark current, and a sensing pixel that generates a sense current based on an intensity of incident light, and outputs an activation signal, indicating whether a variation in the incident light is sensed, based on a light current that is obtained by subtracting the mirrored current from the sense current.
Claims19
An image sensor device comprising:
- a first dummy pixel configured to generate a first dark current,
- a current mirror configured to mirror the first dark current to generate a mirrored current;
- and
- a first sensing pixel configured to output a first event signal based on a first light current, the first light current being based on the mirrored current and a first light incident on the first sensing pixel,
- wherein the first event signal is based on a variation of the first light,
- wherein the first sensing pixel outputs the first event signal without synchronization with a time,
- wherein the first sensing pixel comprises:
- a first node configured to receive the mirrored current;
- a first photodiode connected to the first node, the first photodiode configured to generate a first sense current based on the first light;
- a first current-voltage converter configured to receive the first light current, which is obtained by removing the mirrored current from the first sense current, and convert the first light current into a first voltage;
- a first time-variation circuit configured to amplify a variation of the first voltage to a first amplified voltage;
- and
- a first event determination circuit configured to compare the first amplified voltage with a threshold value, and output the first event signal based on a result of the comparison.
10 more elements
An image sensor device comprising:
- a first pixel configured to generate a first current;
- a current mirror configured to mirror the first current to generate a mirrored current;
- a second pixel configured to output a first event signal based on a first light current, the first light current being based on the mirrored current and a first light incident on the second pixel,
- wherein the second pixel outputs the first event signal based on the first light current,
- wherein the first event signal is output from the second pixel without synchronization with a time,
- wherein the second pixel comprises:
- a first current-voltage converter configured to receive the first light current, which is obtained by removing the mirrored current from a first sense current based on the first light, and convert the first light current into a first voltage;
- a first time-variation circuit configured to amplify a variation of the first voltage to a first amplified voltage;
- and
- a first event determination circuit configured to compare the first amplified voltage with a threshold value, and output the first event signal based on a result of the comparison.
7 more elements
An image sensor device comprising:
- a dummy pixel configured to generate a dark current;
- a current mirror configured to mirror the dark current to generate a mirrored current;
- and
- a first sensing pixel configured to output a first event signal in response to a variation of a first light incident on the first sensing pixel,
- wherein the first sensing pixel comprises:
- a first node receiving the mirrored current;
- a first photodiode configured to generate a first sense current based on the first light;
- a first current-voltage converter configured to convert a first light current, which the mirrored current is removed from the first sense current, into a first voltage;
- a first time-variation circuit configured to amplify a variation of the first voltage to generate a first amplified voltage;
- and
- a first event determination circuit configured to compare the first amplified voltage with a threshold value, and output the first event signal based on a result of the comparison, without synchronization with a time.
8 more elements
Dependencies are inferred from the claim text.