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Image sensor

An image sensor and photoelectric sensor technology, applied in the field of image sensors, can solve problems such as unverified, dependent, and impacted, and achieve the effect of reducing quantity and improving performance

Inactive Publication Date: 2013-06-05
OXFORD UNIV INNOVATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all existing pixels with this type of response suffer from fixed pattern noise, either depend on unproven techniques, or provide only approximately logarithmic responses

Method used

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Experimental program
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Embodiment Construction

[0048] Image sensors for cameras typically include an array of pixel detectors. figure 1 is a schematic circuit diagram of a pixel detector forming part of such an array in an electronic image sensor according to a first embodiment of the invention.

[0049] The pixel detector comprises a photosensor device 2 , a signal generator 4 , a comparator 6 , a transistor disconnect switch 8 , an output device 10 in the form of a readout circuit, and a transistor reset switch 12 . The comparator 6 and the transistor disconnect switch 8 constitute a sensing device having an outlet 13 connected to the input of the output device 10 . In this embodiment, the transistor disconnect switch 8 is an n-channel MOSFET.

[0050] The photosensor device 2 comprises a photodetector 14 connected in parallel with a capacitor 16 . The required capacitance C can be provided by a separate capacitor as shown, and / or by the inherent capacitance of other circuit elements. For example, photodetector 14, sh...

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PUM

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Abstract

An image sensor for an electronic imaging device includes an array of pixel detectors. Each pixel detector includes a photosensor (2) that is constructed and arranged to detect incident light and provide a signal that represents a time integral of the detected light intensity. A signal generator device (4) is constructed and arranged to generate a reference signal that varies according to a predetermined function. A comparator (6) has a first input (18) connected to receive the photosensor signal, a second input (20) connected to receive the reference signal, and an output (22) for providing a capture signal. The comparator (6) is constructed and arranged to generate a capture signal at a time determined by comparing the photosensor signal and the reference signal. A read out device (10) is constructed and arranged to capture a read out signal upon receiving the capture signal. The read out signal represents a logarithm of the integrated detected light intensity.

Description

technical field [0001] The present invention relates to an image sensor for an electronic imaging device, and a sensing method. The invention also relates to an imaging device having such an image sensor. Background technique [0002] Image sensors for electronic imaging devices, such as cameras, typically include an array of light-sensitive pixel detectors ("pixel detectors"). Light falling on the image sensor is detected by pixel detectors, which produce output signals corresponding to the amount of light falling on each of these detectors. The output signal of the pixel detector is digitized and stored in an electronic file containing the image information. The image sensor may be incorporated into a camera, or video camera, or any other electronic imaging device for capturing a single image. [0003] Many electronic imaging devices use CCD sensors that measure incident light by integrating the photocurrent of each pixel detector over a predetermined period of time to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/335H04N5/353H04N25/00H04N3/15
CPCH04N5/35518H04N3/155H04N5/37455H04N25/573H04N25/57H04N25/772H04N3/1556H04N23/73
Inventor 史蒂文·柯林斯
Owner OXFORD UNIV INNOVATION LTD