5 M pixel CMOS OV5642 be brief
Complementary metal oxide semiconductor (CMOS image sensor) of the leading independent suppliers as OmniVision, Inc. In on October 1, 2008, the world's first launched the 1/4 "5 million pixels system level chip (SOC) image sensors OV5642 (see chart 1). The launch of new OV5642 also adopted in on May 27, 2008 launched OmniBSI (OmniVision shoulders Back Illumination) technology and TrueFocus image signal processor, is by far the most advanced OmniVision sensor, it combines 1.4 microns OmniBSI pixels and the most advanced TrueFocus image signal processor. OmniBSI technology makes OV5642 can realize high quality low illumination performance (> 500 mV/Lux-the SEC), and advanced embedded TrueFocus image signal processor can provide a complete all the functions of the chip camera, including preview function expansion (EDoF).

OmniBSI framework with traditional using CMOS image sensors technology completely different methods. The comment on the Back (OmniBSI intensity of Illumination) technology, make shoulders OmniVision can provide better images in the quality at the same time will the pixels reduced to 0.9 microns in size, this is digital image technology continual miniaturization of the key. CameraChip sensor technology BSI reversed the lower level, so the sensor can through the original sensor is the bottom of the silica to collect the light. This method and the traditional Front intensity of Illumination (shoulders Illumination) image sensor in Front of him, in different FSI image sensors, the light sensitive to in some way be sensors that can be converted into electronic will photons metal and dielectric layer that limit. FSI method would block the light pixels or make the light arrived from pixels, minimizing the filling coefficient, and bring pixel crosstalk between other questions. BSI upside down between each layer, so that the arrangement of the metal and dielectric layer is located in the bottom of the sensor array, for the light to provide the most direct channel pixels. This new method optimization light absorption, make OmniVision can develop a more than 1.4 microns all of the performance indexes of 1.4 microns BSI pixels, its performance index and even more than most 1.75 micron FSI pixels. The difference please refer to what is shown below.

OmniBSI architecture provides the multiple beyond FSI performance improvement, including every unit area stronger sensitivity, higher efficiency and reduce the quantum crosstalk and light response heterogeneity, all these improvements can significantly improve the image quality. Because the light silica, so directly to the image sensor for filling coefficient, which can improve the gleam of best provide similar sensitivity. The Lord of the significantly higher light Angle (Chief Ray Angle) can realize more short scenes, which can support the height of the camera module more thin, the module is a new generation of mobile phone ultra-thin ideal choice. Finally, BSI technology can support more aperture size, which can realize the aperture of the lower coefficient, with outstanding camera performance more outstanding performance to promote the development of the camera module.

OmniVision process design vice President Howard Rhodes said, "according to the current design rules, will FSI pixel structure to within 1.4 microns or the following brought some real challenges, because the metal line and transistors are constantly make pixel aperture close to their physical limits, the wavelength of light. To use traditional FSI pixel technology to solve this question will be converted to 65 nm process technology, the copper this greatly increases the complexity of the production and cost. Because the support of more than three layers of metal, BSI to realize enormous advantages in production, eliminating the need for more small change process node. This means that it can be simplified wiring, and compared with FSI sensor, chip size more small, at the same time for change will not bring to a smaller process node and the complexity of the additional cost and produced." "BSI make OmniVision can continue to we recognized by the product 0.11 micron process technology at the same time, further consolidate their digital images in the competitive advantage of technology. This for OmniVision, and eventually for our clients to create huge cost and performance advantage."

Embedded TrueFocus image signal processor is OmniVision the most powerful signal processing engine, it not only improves the image quality and performance, but also the use of camera lens of traditional technology to achieve the standard of the depth of field expansion. TrueFocus use advanced noise reduction, brightness and color correction algorithm in no loss of detail reduces the noise, and use the image color sharpening technology will color distortion to lowest to create very clear color image.

OmniVision vice President of marketing Bruce Weyer said: "to our customers, the OV5642 whether in the performance of the sensor or image processing aspect is the world's best solution. By the use of the technology, we can OmniBSI we function, the most powerful TrueFocus image signal processor implanted sensors, without having to increase the use of silicon or convert higher cost of process node. OV5642 for our customers in the design of the quality and performance of the higher on cell phones, provide a more cost-effective way."

In order to further improve the performance and improve the user experience camera, OV5642 equipped with a used to improve the image of the internal stability vibration device, and hand support thumbnail and Scalado tag, so as to realize the quick preview and zoom. It also contained a can through the internal micro controller on the adjustment of the embedded af controller.