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Image sensor CMOS VS CCD
Source:Original | Author:Calio Huang of C&T RF Antennas Inc | Publish time: 2019-12-13 | 362 Views | Share:

Image sensor CMOS VS CCD
Image sensor CMOS VS CCD -- DGMF Mold Clamps Co., Ltd

The development of society and technology, and human life are inseparable from a variety of cameras, and image sensors are the most important part of various types of cameras and cameras. In general, the principle is mainly to convert the external light signal into an electrical signal and to display the image through a series of conversions.

At present, CCD image sensors and CMOS image sensors are mainly used in the market. In terms of the time course, although both were born in the 1960s, CCD is earlier than CMOS. However, there is a big difference in the working principle, manufacturing process, structure, and parameters.

What's the difference?

First, the basic working principle of a CCD sensor is to accumulate the charge generated by irradiating light to each pixel (photosensitive unit). However, it should be noted that the CCD has only one readout port, so the charge between each pixel needs to be serially moved to the output port, and the image is obtained after charge/voltage conversion, an amplifier, and A / D conversion.

The working principle of the CMOS sensor is a different path. It is a charge/voltage conversion at the position of each pixel, rather than a serial post-conversion. This also brings different advantages and disadvantages to CMOS than CCD. The relative advantages and disadvantages are compared later.

Due to different working principles, CCD and CMOS have large differences in the composition of the photosensitive element. Except for the adjacent charge storage units used in series on the photosensitive element structure of the CCD, most of the area is occupied by the photosensitive diode. The COMS sensor is relatively complicated. Because each pixel generates a voltage, in addition to the photodiode, each pixel also has an amplifier and A / D conversion circuit, so this has caused the CMOS aperture ratio. relatively low. Therefore, in the case of controlling variables such as illumination and area, the light signal that CMOS can obtain is smaller than that of CCD. In the output result, the image content quality that CMOS can obtain is not as good as that of CCD.