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Especially for optoelectronic arrays that combine sampled luminance sensing and asynchronous detection of time-varying image data

An optoelectronic array and change detection technology, applied in the field of optoelectronic arrays, can solve problems such as discomfort sensing static scenes

Active Publication Date: 2018-08-21
UNIV ZURICH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not suitable for sensing static scenes

Method used

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  • Especially for optoelectronic arrays that combine sampled luminance sensing and asynchronous detection of time-varying image data
  • Especially for optoelectronic arrays that combine sampled luminance sensing and asynchronous detection of time-varying image data
  • Especially for optoelectronic arrays that combine sampled luminance sensing and asynchronous detection of time-varying image data

Examples

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Embodiment Construction

[0035] figure 1 A schematic example of a photoelectric array 1 comprising a plurality of cells 10 according to the invention is shown (in figure 1 Only one such unit (pixel) is shown in 10). Cells 10 are typically arranged in rows and columns forming a two-dimensional array.

[0036] Each such cell 10 includes a photodiode (or similar element) 20 for generating a light-dependent current (photocurrent) I, which photodiode 20 is part of a photosensor circuit 200, also known as a DVS photosensor Circuitry (DVS is short for Dynamic Vision Sensor). More specifically, the photodiode 20 generates a photocurrent I proportional to the intensity L of incident light.

[0037] The n-type region of the individual photodiode 20 of each cell 10 is connected to a (feedback) transistor M fb source S, whose p-type region is grounded, the transistor M fb in turn via node P 1 The drain D of a further transistor M' is connected with the gate G to the change detection circuit 100 and its sour...

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Abstract

The invention relates to an optoelectronic array (1) comprising: a plurality of units (10), wherein each of said units (10) comprises means (20) arranged to generate and radiate The intensity (L) of light on said cells (10) is proportional to the photocurrent (I), wherein each of said cells (10) comprises a circuit connected to said photocurrent (I) for generating said photocurrent (I). A change detection circuit (100) of each device (20), the change detection circuit (100) being arranged to generate an output signal only when a change event (30) occurs due to the A previous change event for each cell (10), the intensity (L) changes by a threshold amount (T, T'). According to the invention, said means (20) for generating said photocurrent (I) are also used to estimate said photocurrent (I) as a measure of the brightness of light at said cells (10) the size of.

Description

technical field [0001] The invention relates to an optoelectronic array, ie an array of photosensitive elements, according to the preamble of claim 1, in particular for detecting time-varying image data. Background technique [0002] Such photoelectric arrays typically include a plurality of cells (e.g., an array of cells), each cell (also referred to as a pixel) having means (e.g., a photodiode or phototransistor). A cell array may be a topological one- or two-dimensional array of cells, which may or may not have rectangular boundaries. Each unit also comprises a change detection circuit, which may be constructed according to the details described in US 7728269 B2 (wherein the change detection circuit is insulated from the photosensor circuit comprising said means for generating a photocurrent, in particular by a voltage buffer). Such a change detection circuit is arranged to asynchronously signal a change event that signals a change in brightness by a threshold amount du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/378H04N25/00
CPCH04N25/78H04N25/47H04N25/707H04N25/00H04N25/75G01J1/0238G01J1/44G01J2001/446G01J2001/4473
Inventor 托拜厄斯·德尔布鲁克拉斐尔·伯纳
Owner UNIV ZURICH