Method for controlling light charge quantity of light sensing LED and its image sensor

A photodiode and image sensing technology, applied in lighting devices, electroluminescent light sources, light sources, etc., can solve the problems of difficult control process, halo phenomenon, image retention, etc., to avoid image retention and halo phenomenon, Low cost and accurate charge size
CN1987973AInactive Publication Date: 2007-06-27PIXART IMAGING INC
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
PIXART IMAGING INC
Publication Date
2007-06-27
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

This invention relates to a method for measuring photoelectric charges of a light sensing diode in controllable active pixels and a sensing device, in which, the method includes: providing a reference voltage greater than the earth potential to the grid of a converted transistor when a light sensing diode is exposed and one end of which contacts to the earth to control the photoelectric charges stored by light sensing diode, which advoides image resort and halation.
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Description

technical field

[0001] The invention provides a method for controlling active pixels, especially a method for controlling the amount of photoelectric charges that can be stored in a photodiode and an image sensing device thereof. Background technique

[0002] Please refer to FIG. 1 , which is a circuit diagram of the previous active pixel 8 . The active pixel 8 includes a pinned photodiode 10, a transfer transistor 12, a reset transistor 14, a source follower 16 and a row selector. ) transistor 18. The clamping photodiode 10 is used to receive light; the switching transistor 12 is used to control the charge transfer stored in the clamping photodiode 10; the reset transistor 14 is used to reset the clamping photodiode 10; the source of the source follower 16 The potential of the electrode will change with the charge received by the gate of the source follower 16; the column selection switch transistor 18 is used to control the storage of the optical signal or the reset sign...

Claims

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