Both CCD and CMOS are two important categories of optical sensors. Both use photodiodes for photoelectric conversion. The main difference is the way digital data is transmitted.
CMOS is mainly made of semiconductors made of silicon and germanium. It coexists with N (negatively charged) and P (positively charged) semiconductors in CMOS. The current generated by these two complementary effects passes through After processing, the image can be obtained. Since the image changes rapidly and the current changes, the early CMOS is prone to noise. CMOS is cheap and the image quality is not as good as CCD. It is mainly used for camera imaging. With the development of technology, the current CMOS image sensor converts the charge converted into each image into a voltage, and then amplifies it, and drives it with a 3.3V power supply, showing that the power consumption is lower than that of the CCD. Another advantage of CMOS is that it can process signals in the sensor, and the sensitivity and noise control are also improved. At present, a large number of SLR cameras also use CMOS.
The CCD is also a charge-coupled device image sensor, which is composed of many photosensitive units and is currently in the order of megapixels. When the surface is exposed to light, it converts the light into a charge, and then digitally converts it to a digital signal. The digital signal can be saved by an internal memory card, and the memory card can be connected to a computer to process the image. The advantage of CCD is that the image quality is good. Due to the responsibility of the manufacturing process, the domestic manufacturers have little control. Most of the previous years have relied on imports, so the price is also expensive. CCD also has an obvious feature. We should be able to feel that the camera we often take pictures will not be used for a long time. This is because the CCD is used to make the charge transmission smooth, the noise is reduced, and the transmission is improved by the high voltage difference. More power consumption.
Guangzhou Yunge Tianhong Electronic Technology Co., Ltd , https://www.e-cigarettesfactory.com