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Image sensor global shutter supply circuit with variable bandwidth

A global shutter, image charge technology, applied in the field of image sensors, can solve problems such as image distortion

Active Publication Date: 2019-11-15
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For slowly moving objects, the time difference between each line can produce image distortion
For fast moving objects, rolling shutter can cause perceivable elongation distortion along the object's axis of motion

Method used

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  • Image sensor global shutter supply circuit with variable bandwidth
  • Image sensor global shutter supply circuit with variable bandwidth
  • Image sensor global shutter supply circuit with variable bandwidth

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Embodiment Construction

[0013] As will be shown, methods and apparatus are disclosed for a global shutter control signal generator providing a global shutter control signal to a global shutter switch in a pixel unit. In the following description, several specific details are set forth in order to provide a thorough understanding of the present invention. In the following description, several specific details are set forth in order to provide a thorough understanding of the embodiments. One skilled in the art will recognize, however, that the techniques described herein may be practiced without one or more of the specific details or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.

[0014] Reference throughout this specification to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic descri...

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PUM

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Abstract

The present application relates to a global shutter power supply circuit having an image sensor having a variable bandwidth. The pixel cell contains a photodiode to accumulate image charge. The global shutter transistor is coupled to the photodiode in response to the global shutter control signal and the image charge in the photodiode is reset. Global shutter control signal generator circuit generates the global shutter control signal to have a first value signal or a second value signal. The first value signal is coupled to turn on the global shutter transistor to reset the photodiode. The second value signal controls the global shutter transistor to a low leakage shutdown mode. The power supply circuit is coupled to provide the second value signal to the global shutter control signal generator circuit. The power supply circuit comprises a variable filter circuit, which is coupled to the output of the power supply circuit in response to the bandwidth selection signal and selectively changes the bandwidth of the second value signal.

Description

technical field [0001] The present invention generally relates to image sensors. More specifically, examples of the invention relate to image sensor pixel cells with global shutters. Background technique [0002] For high-speed image sensors, a global shutter can be used to capture fast-moving objects. A global shutter typically enables all pixel elements in an image sensor to simultaneously capture an image. For slower moving objects, the most common rolling shutter is used. A rolling shutter typically captures images sequentially. For example, each row within a two-dimensional ("2D") array of pixel cells may be enabled sequentially such that each pixel cell within a single row captures an image simultaneously, but each row is enabled in a rolling order. Thus, each row of pixel cells captures an image during a different image acquisition window. For slowly moving objects, the time difference between each row can produce image distortion. For fast-moving objects, rolli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235H04N5/369H04N5/378
CPCH04N23/73H04N25/709H04N25/78H04N25/532H04N25/617H04N25/771H04N25/531H04N25/53H04N25/75
Inventor 邓黎平宋志强张鹏庭刘易
Owner OMNIVISION TECH INC