41results about How to "Reduce read noise" patented technology

A photosensor includes a plurality of photosensitive regions including a first photosensitive region connected to a first voltage reference, and at least one additional photosensitive region. A signal collector is connected to the first photosensitive region. At least one switching device is for switching the at least one additional photosensitive region between the first voltage reference and a second voltage reference that is less than the first voltage reference, and for reversibly connecting the at least one additional photosensitive region to the signal collector so that the photosensor is variably responsive to different light levels.

Methods and digital imaging devices disclosed herein are adapted to capture images of a specimen in a chemical reaction using a series of short exposures of light emissions from the specimen over a period of time. The series of short exposures is captured using an array of pixels of an image sensor in the digital imaging device that are configured for performing continuous non-destructive read operations to read out a set of non-destructive read images of the specimen from the pixel array. In one embodiment, images are captured by delaying the read out until at or near the end of the chemical reaction to reduce read noise in the images. The signals read out from the image sensor can be continuously monitored and the capturing of images can be discontinued either automatically or based on a command from a user. The captured images can then be displayed in a graphical display.

The invention discloses a high-luminous sensitivity CMOS image sensor pixel structure which comprises M pixel units and a control unit. Each pixel unit comprise a light sensing unit and a reading circuit, wherein the light sensing unit comprises a photodiode and N pass transistors; one of the N pass transistors of each pixel unit is connected with the reading circuit of the pixel unit, and the remaining N-1 pass transistors of each of at least M-N+1 pixel units are connected with the reading circuits of the other N-1 pixel units respectively; the reading circuit of each of at least M-N+1 pixel units is connected with one pass transistor of the pixel unit and the N-1 pass transistors of the other different pixel units, so that photoproduction signals of the N pixel units are read at one time; the control unit controls the M reading circuits to read the signals according to a specified order, so that the photoproduction signals of at least M-N+1 pixel units are read for N times in sequence. The high-luminous sensitivity CMOS image sensor pixel structure can increase the luminous sensitivity and signal to noise ratio on the condition of low illumination.

The invention provides a global exposure pixel unit, a capacitor structure and a preparation method. Through forming a first capacitor structure, a second capacitor structure and a third capacitor structure at a longitudinal direction, and connecting the three capacitor structures together in a parallel connection manner, on the basis of not increasing the area of the capacitor structure of the global exposure pixel unit, the storage capacitance value of the capacitor structure is increased, and the readout noise is reduced; and meanwhile, the area of a photodiode photosensitive area of the whole global exposure pixel unit is not affected, and the performance of a device is improved.

The invention discloses a signal processing system of a variable-band multi-spectral camera based on an area array CCD, including a variable-spectrum timing controller, a drive circuit, a frame-transfer area array CCD with the function of pouring charges, and an analog-to-digital conversion circuit and video processors. The variable spectrum timing controller generates timing signals for driving the area array CCD to work according to the specified spectrum; the driving circuit converts the timing signals into driving signals of corresponding amplitudes; the frame transfer area array CCD with the function of dumping charges Under the action of the output spectrum information; the analog-to-digital conversion circuit converts the analog signal output by the CCD into a digital signal; the video processor receives the digital image signal and processes the image information according to the input parameter requirements. Compared with the signal processing system of the traditional multi-line array multi-spectral camera, the present invention has the characteristics of large number of spectral segments, real-time adjustable spectral range of spectral segments, high adjustment precision of spectral segment width, and the like.