CCD or CMOS high definition camcorder cost? the game

We all know, the core component of the camera has three: lens, image sensor and compression chip.

Among them, the image sensor is the image acquisition and processing part of core. At present, CCD and CMOS sensors are widely used in both image sensors, both are using photographic diode (photodiode) photoelectric conversion, convert the image to digital data, but the main difference is the transmission of digital data in different ways. CCD in data transfer without distortion, so each pixel data can be gathered to edge and then zoom in; and CMOS technology data long distance transmission will generate noise, therefore, you must first amplification, consolidation of individual pixel data. Also, it is precisely because of its data transfer in different ways, CCD and CMOS sensors in efficiency and application also many differences.

1. sensitivity disparity: as the CMOS sensor for each pixel is composed of four transistor and a sensitive diodes form (with amplifier and A/D conversion circuit), so that each pixel of the photosensitive area far less than the surface area of the pixel itself, so the pixel dimensions of the same circumstances, the sensitivity of the CMOS sensor than CCD sensor.

2. the cost difference: as CMOS sensor with General semiconductor circuit most common CMOS technology, can easily be peripheral circuits (such as CDS, AGC, Timing generator, or DSP, etc.) is integrated into the sensor chip, so you can save the cost of external chip; in addition, because of the CCD uses the charge transfer means of transmitting data, as long as one pixel cannot run, will result in an entire row of data cannot be transferred, so control of the finished product rate CCD sensor than the difficulties many CMOS sensor, even experienced manufacturers are very difficult to come out in the product's half year breakthrough level of 50%, therefore, the CCD sensor costs will be higher than the CMOS sensor.

3. the resolution difference: as noted above, the CMOS sensor for each pixel CCD sensor than the pixel dimensions of the complex and difficult to reach the level of the CCD sensor, so when we compare the same size of CCD and CMOS sensors, the resolution of the CCD sensors are usually better than CMOS sensor level.

4. noise variance: as each CMOS sensor photosensitive diodes are required to match an amplifier and amplifier belonging to analog circuit, it is difficult to let each amplifier that remains consistent, and only one amplifier on the edge of the CCD sensor chip, CMOS sensor noise will increase a lot, affecting image quality.

5. power differences: CMOS sensor image capture mode is active, the photographic diode will charge directly from the transistor amplifier output, but the CCD sensor for passive sampling, applied voltage to each pixel in the charge to move, and in addition add voltage typically achieve 12 ~ 18V; therefore, the CCD sensor in addition to the power management circuit design more difficult (required plus power IC), high driving voltage to power consumption is much higher than the level of the CMOS sensor.

In sum, the CCD sensor in sensitivity, resolution, noise control, and so are better than CMOS sensor, the CMOS sensor is a low-cost, low power consumption, as well as the characteristics of high degree integration.

Monitoring in SD Times, whether analog video camera or a webcam, video camera and SD generally most CCD sensor. While in high-definition monitor era, due to the high definition monitor is very sensitive to the cost, the CMOS sensor while the image quality is better on the whole, CCD, but it cost advantages on the CCD or caused a very large risk.

From the current trend, clear CMOS winning opportunities.

On the one hand, as technology evolves, the sensitivity of the CMOS is being quickly improved, according to the current market is dedicated to the study of manufacturers has CMOS developed sensitivity performance and CCD nearest 720p and 1080p dedicated CMOS devices. On the other hand, although the same size of CCD sensor resolution better than CMOS sensor, but if you do not take into account the size limit, CMOS in flux advantage can effectively eliminate large photographic original manufacturing difficulties, so that the CMOS in higher resolution will also have the advantage. In addition, CMOS response faster than CCD quickly, more suitable for high-definition monitor characteristics of large data volumes.

Therefore, in spite of CCD and CMOS in different scenarios all advantages, but with the CMOS process and technology continues to improve, as well as high-end CMOS prices continue to decline, the future of high definition network camera more select CMOS.