Event-triggered imaging pixels
First Claim
Patent Images
1. An imaging pixel, comprising:
- a photodetector for generating a charge signal;
an input buffer connected to the photodetector for amplifying the charge signal;
a control device connected to the photodetector and the input buffer separating high-frequency charge signals from low-frequency charge signals;
a switch operably connected to the input buffer for sampling of high-frequency charge signals in a charge storage device triggered by amplitude of high-frequency charge signals provided by the input buffer, wherein the switch has an input terminal and an output terminal, wherein the input terminal of the switch is connected to the input buffer to receive an amplified charge signal therefrom, wherein the output terminal of the switch is connected to a charge storage device to generate image data according to state of the switch; and
a comparator having an input terminal, a threshold terminal, and an output terminal, wherein the input terminal is connected to the input buffer to receive therefrom an amplified charge signal, wherein the threshold terminal is connected to a trigger voltage source, and wherein the output terminal is operably connected to the switch to change state of the switch according to a comparison of the amplified charge signal and a trigger voltage signal received from the trigger voltage source, the comparison generating a sample signal, which closes the switch to generate the amplified signal, thereby detecting an event.
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Abstract
An imaging pixel includes a photodetector for generating a charge signal, an input buffer, a control device, and a switch. The input buffer is connected to the photodetector for amplifying the charge signal. The control device is connected to the photodetector and the input buffer to separate high-frequency charge signals from low frequency charge signals. The switch is operably connected to the input buffer for sampling of high-frequency charge signals in a charge storage device triggered by amplitude of high-frequency charge signals provided by the input buffer.
41 Citations
13 Claims
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1. An imaging pixel, comprising:
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a photodetector for generating a charge signal; an input buffer connected to the photodetector for amplifying the charge signal; a control device connected to the photodetector and the input buffer separating high-frequency charge signals from low-frequency charge signals; a switch operably connected to the input buffer for sampling of high-frequency charge signals in a charge storage device triggered by amplitude of high-frequency charge signals provided by the input buffer, wherein the switch has an input terminal and an output terminal, wherein the input terminal of the switch is connected to the input buffer to receive an amplified charge signal therefrom, wherein the output terminal of the switch is connected to a charge storage device to generate image data according to state of the switch; and a comparator having an input terminal, a threshold terminal, and an output terminal, wherein the input terminal is connected to the input buffer to receive therefrom an amplified charge signal, wherein the threshold terminal is connected to a trigger voltage source, and wherein the output terminal is operably connected to the switch to change state of the switch according to a comparison of the amplified charge signal and a trigger voltage signal received from the trigger voltage source, the comparison generating a sample signal, which closes the switch to generate the amplified signal, thereby detecting an event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification