Invention Grant
- Patent Title: Low power event driven pixels with active difference detection circuitry, and reset control circuits for the same
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Application No.: US17875244Application Date: 2022-07-27
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Publication No.: US12294802B2Publication Date: 2025-05-06
- Inventor: Andreas Suess , Shoushun Chen
- Applicant: OMNIVISION TECHNOLOGIES, INC.
- Applicant Address: US CA Santa Clara
- Assignee: OMNIVISION TECHNOLOGIES, INC.
- Current Assignee: OMNIVISION TECHNOLOGIES, INC.
- Current Assignee Address: US CA Santa Clara
- Agency: Perkins Coie LLP
- Agent Daniel L. Jackstadt
- Main IPC: H04N25/771
- IPC: H04N25/771 ; H03F3/16 ; H04N25/42 ; H04N25/709 ; H03K19/20

Abstract:
Low power event driven pixels and reset control circuits for the same are disclosed herein. In one embodiment, an event driven pixel comprises a photosensor; a photocurrent-to-voltage converter coupled to the photosensor; and a difference circuit coupled to the photocurrent-to-voltage converter. The difference circuit includes a source follower transistor and is configured to generate a signal at a gate of the source follower transistor that is based on a voltage output from the photocurrent-to-voltage converter. The difference circuit is further configured to output a difference signal in response to assertion of a row select signal. The event driven pixel can further include a reset control circuit coupled to the difference circuit and configured to initialize the difference circuit, and to reset the difference circuit when the difference signal output from the event driven pixel indicates a change in the voltage greater than a threshold amount.
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