
Taking pixel technology to the next level, OmniVision introduced OmniPixel3, the latest version of its revolutionary pixel architecture, in May 2007. Featuring a 1.75 x 1.75 micron pixel size, this third-generation pixel design is among the smallest currently commercially available, and delivers sensors with higher resolution, enhanced performance and improved image quality, all in a smaller form factor.
The OmniPixel3 architecture uses leading-edge design rules in conjunction with a dedicated and proprietary 0.11-micron CMOS process. It incorporates several significant technology developments that enable increased pixel density and maximize the performance of the new 1.75-micron pixel:
- By optimizing the photodiode process and pixel design for high full-well capacity and installing a new low-noise pixel and column sense readout, OmniPixel3 avoids color distortion and offers improved dynamic range of up to 65dB.
- With up to 20 percent improvement in fill factor plus increased sensitivity, OmniPixel3 delivers more vibrant and truer-to-life color reproduction.
- A new color filter array technology and zero-gap micro-lens technology means excellent sensitivity and superior cross-talk performance.
- Additional process technology optimizations achieve ultra low dark current (30 e/sec) and low defect density, making OmniPixel3 technology ideal for use in low-light and variable light conditions.
- Further innovations include a new transfer gate design process and contact technologies that achieve lag-free operation throughout the signal range. Eliminating read-out lag ensures that no 'ghost images' or unwanted noise are present in the imaging process.
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