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发表于 2014-6-16 16:16
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本帖最后由 zjxs 于 2014-6-17 09:40 编辑
无忌一哥们提醒了我,SONY官方有阐述灵敏度提高的很重要一个原因:
CMOS的暗电流,暗电流是影响CMOS信噪比的元凶。目前尚没有办法完全抑制暗电流。 但曲面感光器弯曲后,感光层的应力产生了改变,应力改变后,感光层的能级差发生了改变,抑制了暗电流的不规则的产生,从而大大削减了噪声水平。所以曲面传感器本身的灵敏度会产生巨大的提升(这个感光层正常应力的平面感光器是没有办法实现的)。
所以仅仅这个应力改变暗电流(大幅度减少暗电流产生的噪声)的只有“曲面感光器”才具备的特性,其本身就已经决定了,曲面感光器在传感器的生命:灵敏度(灵敏度又决定宽容度),这个最重要指标上,平面感光器绝对无法与曲面感光器相提并论!
所以二B,说到底,还是曲面感光器的性能是全面超越平面感光器,不仅仅是能最大限度的减少镜头的镜片使用数量,简化镜头的设计,更重要的是在感光器最重要的性能指标:灵敏度上的巨大提升空间!
http://spectrum.ieee.org/tech-talk/semiconductors/devices/sony-creates-curved-cmos-sensors-that-mimic-the-eye
A curved CMOS sensor has a few advantages over a planar sensor, Itonaga said. Because of the geometry, it can be paired with a flatter lens and a larger aperture, which lets in more light. Photodiodes at the periphery of a sensor array will be bent toward the center, which means light rays will hit them straight on instead of obliquely. What's more, the strain induced on a CMOS sensor by bending it alters the band gap of the silicon devices in the sensor region, lowering the noise created by "dark current" — the current that flows through a pixel even when it is receiving no external light.
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