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Image sensor and pixel that has switchable capacitance at the floating node

An image sensor and pixel technology, which is applied in the field of image sensors, can solve the problems of small pixel size and limited dynamic range of pixels, and achieve the effect of increasing the signal-to-noise ratio

Inactive Publication Date: 2006-05-17
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the reduction in pixel size, as described later, the dynamic range of pixels may be limited

Method used

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  • Image sensor and pixel that has switchable capacitance at the floating node
  • Image sensor and pixel that has switchable capacitance at the floating node
  • Image sensor and pixel that has switchable capacitance at the floating node

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Embodiment Construction

[0036] In the following description, numerous specific details are provided in order to provide a thorough understanding of specific embodiments of the invention. One skilled in the art will recognize, however, that the invention can be practiced without one or more of these specific details, or that the invention can be practiced with other methods, elements, etc. In addition, well-known structures and operations are not shown or described in detail in order to clearly describe the various embodiments of the present invention.

[0037] In the description of the present invention, when referring to "an embodiment" or "a certain embodiment", it means that the specific features, structures or characteristics described in this embodiment are included in at least one embodiment of the present invention. Thus, appearances of "in an embodiment" or "in a certain embodiment" in various places in the specification do not necessarily refer to all belonging to the same embodiment; manne...

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Abstract

The invention provides an active pixel and an image sensor. The active pixel and the image sensor of the invention have two working modes: a high illumination mode and a low illumination mode. The present invention determines whether to connect the auxiliary capacitor at the floating node according to the amount of light on the image sensor. Wherein, the amount of light on the image sensor can be measured by various methods. After the light intensity is determined, it can be determined whether to turn on the auxiliary capacitor (high light condition) or not to turn on the auxiliary capacitor (low light condition) by comparing it with a threshold value.

Description

technical field [0001] The present invention relates to image sensors, and more particularly, the present invention relates to an image sensor employing pixels whose capacitance can be changed according to the intensity of incident light. Background technique [0002] Image sensors have become ubiquitous, and they are widely used in digital cameras, cellular phones, security cameras, medical equipment, automobiles, and other applications. The technology of manufacturing image sensors, especially CMOS (Complementary Metal Oxide Semiconductor) image sensors continues to develop rapidly. For example, the requirements of high resolution and low power consumption promote the further miniaturization and integration of image sensors. [0003] As pixels get smaller, it becomes more difficult for the pixels to output a signal of sufficient intensity to be easily interpreted by subsequent signal processing. Furthermore, image sensors are required to operate in a wide range of light ...

Claims

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Application Information

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IPC IPC(8): H04N3/15H04N3/14
CPCH04N23/741H04N25/59H04N25/76H04N25/771
Inventor 何新平
Owner OMNIVISION TECH INC
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