Extended dynamic range and reduced power imaging for lidar detector arrays

Patent metadata

Field	Value
Publication number	US-2020284884-A1
Application number	US-202016810299-A
Country	US
Kind code	A1
Filing date	Mar 5, 2020
Priority date	Mar 6, 2019
Publication date	Sep 10, 2020
Grant date	—

Abstract

A Light Detection And Ranging (LIDAR) detector circuit includes a plurality of detector pixels, where each or a respective detector pixel of the detector pixels includes a plurality of detector elements. At least one control circuit is configured to provide one or more detector control signals that selectively activate one or more of the detector elements of the respective detector pixel to define a first active detection area including a first subset of the detector elements for a first image acquisition, and a second active detection area including a second subset of the detector elements for a second image acquisition. Related devices and methods of operation are also discussed.

First claim

1 . A Light Detection And Ranging (LIDAR) detector circuit, comprising:
a plurality of detector pixels, a respective detector pixel of the detector pixels comprising a plurality of detector elements; and at least one control circuit configured to provide one or more detector control signals that selectively activate one or more of the detector elements of the respective detector pixel to define a first active detection area comprising a first subset of the detector elements for a first image acquisition, and a second active detection area comprising a second subset of the detector elements for a second image acquisition.

2 . The LIDAR detector circuit of claim 1 , wherein the at least one control circuit is configured to provide the one or more detector control signals for the first and second image acquisitions responsive to first and second intensities of incident light, respectively.

3 . The LIDAR detector circuit of claim 2 , wherein the first intensity is greater than the second intensity, and wherein the first active detection area is less than the second active detection area.

4 . The LIDAR detector circuit of claim 2 , wherein at least one of the detector elements of the first and/or second subsets is polarization-selective.

5 . The LIDAR detector circuit of claim 4 , wherein the at least one of the detector elements comprises a polarizer thereon.

6 . The LIDAR detector circuit of claim 5 , wherein the polarizer comprises metallization defining a grid pattern.

7 . The LIDAR detector circuit of claim 1 , wherein the at least one control circuit is configured to provide the one or more detector control signals for the first and second image acquisitions based on first and second distance ranges corresponding thereto, respectively.

8 . The LIDAR detector circuit of claim 7 , wherein the first distance range comprises a closer distance to the respective detector pixel than the second distance range, and wherein the first active detection area is less than the second active detection area.

9 . The LIDAR detector circuit of claim 1 , wherein the first and second image acquisitions comprise respective subframes of an image frame, and wherein the one or more detector control signals comprise strobe signals that are configured to activate the detector pixels to detect photons incident thereon for the respective subframes.

10 . The LIDAR detector circuit of claim 9 , wherein the one or more detector control signals comprise subpixel control signals that are configured to connect respective outputs of the one or more of the detector elements of the respective detector pixel to the at least one control circuit.

11 . The LIDAR detector circuit of claim 1 , wherein the at least one control circuit is configured to provide the one or more detector control signals to activate at least one of the detector elements of the first and/or second subsets independent of the first and second image acquisitions.

12 . The LIDAR detector circuit of claim 1 , wherein the first and second subsets comprise different quantities of the detector elements, and/or wherein the first and second subsets comprise ones of the detector elements having different surface areas.

13 . The LIDAR detector circuit of claim 1 , wherein each of the detector pixels comprises a respective plurality of detector elements, and wherein the at least one control circuit is configured to provide the one or more detector control signals to each of the detector pixels for the first and second image acquisitions.

14 . A method of operating a Light Detection And Ranging (LIDAR) detector circuit, the method comprising:
performing, by at least one processor that is coupled to a plurality of detector pixels, operations comprising: providing one or more detector control signals that selectively activate one or more detector elements of a respective detector pixel of the detector pixels to define a first active detection area comprising a first subset of the detector elements for a first image acquisition, and a second active detection area comprising a second subset of the detector elements for a second image acquisition.

15 . A Light Detection And Ranging (LIDAR) detector circuit, comprising:
an array of detector pixels, a respective detector pixel of the array comprising a plurality of detector elements; and at least one control circuit configured to dynamically adjust a sensitivity and/or power consumption of the respective detector pixel for respective image acquisitions based on incident light conditions and/or distance ranges associated with the respective image acquisitions.

16 . The LIDAR detector circuit of claim 15 , wherein the at least one control circuit is configured to dynamically adjust the sensitivity and/or power consumption of the respective detector pixel by selectively activating different subsets of the detector elements to vary an active detection area of the respective detector pixel for the respective image acquisitions.

17 . The LIDAR detector circuit of claim 16 , wherein the different subsets comprise different quantities of the detector elements, and/or ones of the detector elements having different surface areas.

18 . The LIDAR detector circuit of claim 15 , wherein the detector elements of the respective detector pixel comprise at least one polarization-selective detector element, and wherein the at least one control circuit is configured to dynamically adjust the sensitivity and/or power consumption of the respective detector pixel by selectively activating the at least one polarization-selective detector element for the respective image acquisitions based on the incident light conditions associated therewith.

19 . The LIDAR detector circuit of claim 18 , wherein the at least one polarization-selective detector element comprises a polarizer thereon, wherein the polarizer comprises metallization defining a grid pattern.

20 . The LIDAR detector circuit of claim 14 , wherein the at least one control circuit is configured to activate at least one of the detector elements of the respective pixel independent of the incident light conditions and/or distance ranges associated with the respective image acquisitions.

21 . A method of operating a Light Detection And Ranging (LIDAR) detector circuit, the method comprising:
performing, by at least one processor that is coupled to an array of detector pixels, operations comprising: dynamically adjusting a sensitivity and/or power consumption of a respective detector pixel of the array for respective image acquisitions based on incident light conditions and/or distance ranges associated with the respective image acquisitions, wherein the respective detector pixel comprises a plurality of detector elements.

22 . The LIDAR detector circuit of claim 1 , wherein the LIDAR detector circuit is configured to be coupled to an autonomous vehicle and oriented relative to an intended direction of travel of the autonomous vehicle.

Assignees

• Univ Court Univ Of Edinburgh
• Sense Photonics Inc

Inventors

• Henderson Robert
• Al Abbas Tarek
• Calder Neil
• Finkelstein Hod

Classifications

• G01S7/4868

  Controlling received signal intensity or exposure of sensor · CPC title

• H04N25/773

  comprising photon counting circuits, e.g. single photon detection [SPD] or single photon avalanche diodes [SPAD] · CPC title

• G01S17/931

  of land vehicles · CPC title

• G01S17/894

  Three-dimensional [3D] imaging with simultaneous measurement of time-of-flight at a two-dimensional [2D] array of receiver pixels, e.g. time-of-flight cameras or flash lidar · CPC title

• G01S7/499

  using polarisation effects · CPC title