Vision sensor chip with open-loop amplifier, operating method, and data processing system including same
First Claim
1. A vision sensor chip comprising:
- a photoelectric conversion element that generates a current in response to incident light;
a current-voltage converter that converts the current into a corresponding voltage and provides the corresponding voltage at an output terminal;
an AC coupling capacitor directly connected to the output terminal of the current-voltage converter that receives the corresponding voltage and generates an output voltage;
an open-loop amplifier including a reset switch that amplifies the output voltage to generate an amplified output voltage;
an event detection block that detects motion in relation to a change in the amplified output voltage and generates first and second detection signals; and
a reset signal generator that generates a reset signal controlling operation of the reset switch in response to first and second control signals respectively related to the first and second detection signals.
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Accused Products
Abstract
A vision sensor chip includes a photoelectric conversion element that generates a current based on an incident light, a current-voltage (I-V) converter that converts the current into a voltage, an AC coupling capacitor directly connected to the I-V converter, an open-loop amplifier that includes a reset switch and amplifies a voltage provided by the I-V converter via the AC coupling capacitor. An event detection block detects motion according to a change in the amplified output voltage and generates first and second detection signals. A reset signal generator generates a reset signal controlling operation of the reset switch in response to first and second control signals respectively related to the first and second detection signals.
8 Citations
20 Claims
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1. A vision sensor chip comprising:
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a photoelectric conversion element that generates a current in response to incident light; a current-voltage converter that converts the current into a corresponding voltage and provides the corresponding voltage at an output terminal; an AC coupling capacitor directly connected to the output terminal of the current-voltage converter that receives the corresponding voltage and generates an output voltage; an open-loop amplifier including a reset switch that amplifies the output voltage to generate an amplified output voltage; an event detection block that detects motion in relation to a change in the amplified output voltage and generates first and second detection signals; and a reset signal generator that generates a reset signal controlling operation of the reset switch in response to first and second control signals respectively related to the first and second detection signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A data processing system comprising:
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a vision sensor chip including vision sensor pixels and a processor controlling operation of the vision sensor chip, wherein each vision sensor pixel comprises; a photoelectric conversion element that generates a current in response to incident light; a current-voltage converter that converts the current into a corresponding voltage and provides the corresponding voltage at an output terminal; an AC coupling capacitor directly connected to the output terminal of the current-voltage converter that receives the corresponding voltage and generates an output voltage; an open-loop amplifier including a reset switch that amplifies the output voltage to generate an amplified output voltage; an event detection block that detects motion in relation to a change in the amplified output voltage and generates first and second detection signals; and a reset signal generator that generates a reset signal controlling operation of the reset switch in response to first and second control signals respectively related to the first and second detection signals. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of operating the vision sensor chip, comprising:
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converting a current generated based on an incident light into a voltage; communicating the voltage directly to an AC coupling capacitor; amplifying an output voltage provided by the AC coupling capacitor using an open-loop amplifier including the reset switch; detecting motion in relation to a change in the amplified output voltage and generating first and second detection signals in response to the detecting of motion; and controlling operation of the reset switch with first and second control signals respectively related to the first and second detection signals. - View Dependent Claims (17, 18, 19, 20)
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Specification