The application prospects of Back-illuminated CMOS sensor

Digital products market is currently at an alarming rate growth with the rapid development of digital technology, semiconductor manufacturing technology and network, composed of key parts of the video, audio and video products - image sensor (Sensor) to become the industry's current

The eyes are the visual image sources, while the image sensor device is the image of the video capture device accepts general there are two types: linear image sensor and face image sensor, image sensor morphological classification. Linear image sensor is used in scanners, copiers, fax machines, and other equipment; the face image sensor, a wide range of applications in the security monitoring camera, cell phone camera, car reversing video camera, tablet computers and other well-known products. Speaking of image sensor CCD and CMOS chip two early we usually think equipment with excellent image quality CCD sensor, and low-cost products use a CMOS sensor. The new CMOS chip technology has overcome the weaknesses of the early CMOS sensor technology, compared to the old products to enhance the performance of low according to the design of the sensor, such as exposure mode. Take the popular back-illuminated CMOS sensor, in the conventional CMOS image sensor, the light-sensitive diode is located in the rear of the circuit transistor, the light through the circuit between the micro-lens and the photodiode and the transistor, then the amount of light will be due to obstructions affected. Back-illuminated CMOS sensor on the internal structure of the original image sensor optimized, it photosensitive layer of the original reverses direction, so that the light from the back directly into the chip to increase the amount of light, so the back-illuminated CMOS image sensor than conventional CMOS qualitative leap sensor light sensitivity in low light conditions, the use of back-illuminated CMOS sensor HD network camera with a great ability to focus, the image quality performance, image noise control performance boost.

Back-illuminated CMOS image sensor in addition to the excellent low according to other properties, but also has better high-sensitivity noise control performance, that is, after the ISO improve noise than CCD much less this image in low illumination environment collected a great advantage, high frame rate performance is better. Are often high-speed back-illuminated CMOS sensor chip, many chip support full HD quality image output frame rate of 60 frames per second or higher, while the CCD sensor is more difficult in this regard. Most mainstream HD network camera with back-illuminated CMOS sensor supports 1080P@30fps full HD video or 720P@60fps common CCD sensor camera can only 720p@25fps support 1080P format CCD sensor is very expensive, but the back illuminated CMOS sensor pixels can be higher. Although both back-illuminated CMOS or CCD, can increase the effective pixel back-illuminated CMOS sensor structure effective pixels to further improve in the area of the same case, the quality is also able to maintain better. In contrast, if the CCD blindly raise pixels, image quality will be poor, and the cost of rising geometrically as the pixels to improve the chip size is also larger. More complex manufacturing process of the CCD sensor, surveillance camera with CCD sensor prices are relatively high. In fact, through technological innovation, CCD and CMOS actual effect of the gap has been reduced a lot, and the manufacturing cost and power consumption of CMOS chips should be much lower than the CCD and CMOS image sensor, so a lot of HD network camera manufacturers. In imaging: the permeability of the same pixel CCD imaging Ming sharpness are very good color reproduction, exposure can be guaranteed to be basically accurate. The CMOS products screen permeability restore the weak capacity of the kind of color, exposure mode mostly Rolling Shutter mode capture distortion caused by high-speed moving objects sensor CMOS imaging quality CCD sensor in painting quality requirements more stringent scene or a certain distance. However, due to low prices, as well as a high degree of integration, the increasingly rapid development of HD network camera market and has been widely used.

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