A kind of nmos line array image sensor

Abstract

The present invention relates to an NMOS line array image sensor, comprising: sensor pixels grouped according to integration time; a driving pulse sequence 1 used for initial reset of the image sensor and for normal data readout of the image sensor; Driving pulse sequence 2 of readout pulses for a group of pixel data with the same integration time. The NMOS line array image sensor of the invention has good performance and can improve the signal-to-noise ratio of the output signal of the image sensor.

Description

Technical field [0001] The invention relates to a sensor for measuring the energy of light signals, in particular to an NMOS linear array image sensor. Background technique [0002] The driving pulse sequence of commonly used NMOS linear image sensor is as figure 1 Shown. When the sensor is in use, it needs to provide three-way drive pulse sequence to the sensor, and the corresponding pin is Φ st , Φ 1 , Φ 2 . Among them, Φ 1 , Φ 2 The two signals are completely synchronized, but the phases are exactly opposite. Φ st Start pulse read out for sensor pixel signal, namely Φ st After giving a positive pulse, the video signal Video will be compared with Φ 1 , Φ 2 Synchronous output. After the signals of all pixels are read out, the End of Scan pin and Φ 2 Synchronously output a negative pulse ( image 3 In, End signal). When the video signal of the first pixel appears, Φ 1 , Φ 2 The corresponding pulse period is defined as the pixel readout period 1, and the pixel readout period...

AI Technical Summary

Problems solved by technology

The segmented integration function is realized by changing the driving timing, and the realization of the driving pulse timing is more complicated; moreover, in a frame of image data, the integration time of different pixels can only increase or decrease monotonously; after valid data is read out, a separate Reset driving pulse sequence; the readout frequency of image data of all pixels depends on the maximum integration time of all pixels, and the image data of pixels with short integration time cannot be read out multiple times within one integration cycle of pixels with long integration time. Low time pixel utilization

Images