Image sensors play a key role in smartphones, cameras, and camcorders. In the CIS, CMOS and CCD sensors, people often discuss the comparative advantages between CMOS and CCD image sensors. This article will briefly introduce the classification and characteristics of the two sensors, and will give the choice of two sensor products. Some practical suggestions.
CCD imaging quality is good, but the manufacturing process is complex, the number of manufacturers that can be produced is relatively small, the price is relatively high, and the power consumption is also high, so it is not suitable for use on mobile devices. The CMOS sensor consumes less power, but the picture quality is not as good as the CCD. However, with the improvement of technology, the image quality of COMS has gradually caught up with the CCD. In addition, at the same resolution, the CMOS price is cheaper than the CCD, so currently The mobile phone cameras on the market use CMOS sensors.
Classification of CMOS sensorsUsually CMOS sensors are divided into: back-illuminated CMOS sensors and stacked CMOS sensors.
Back-illuminated CMOS sensor
Stacked CMOS
The so-called back-illuminated CMOS sensor is actually opposed to the traditional positive-illuminated CMOS sensor. Simply put, the photodiode and the wiring layer are reversed, so that the light first enters the photodiode, thereby increasing the amount of light, and significantly improving the shooting under low light conditions. Like us, iPhon, Xiaomi, and Meizu are all equipped with such sensors.
The stacked CMOS sensor is a derivative of the back-illuminated CMOS sensor. It is the most widely used and the most advanced one in the current mobile phone camera. It belongs to Sony's exclusive technology.
The stacked CMOS sensor replaces the support substrate of the original back-illuminated CMOS image sensor with a chip with a signal processing circuit, and overlaps the pixel portion of the back-illuminated CMOS device on the chip, thereby realizing formation of a large number of pixel points on a small chip size. Craft. Since the pixel portion and the circuit portion are independent, the pixel portion can be optimized for high image quality, and the circuit portion can be optimized for high performance.
It should be noted that the photosensitive element is only an indispensable part of the composition of the mobile phone camera, but it is not the decisive factor of the image quality. This includes the optimization of the hardware by the manufacturer through software, which makes people feel the best effect. This is also one of the decisive factors influencing the difference in the quality of mobile phone camera quality between various manufacturers.
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