Samsung Electronics announced its new advanced pixel technology for CMOS image sensors. The ISOCELL technology is claimed to "substantially increase" light sensitivity and to effectively control the absorption of electrons, resulting in higher colour fidelity even in poor light. The company argues that while back-side illumination - introduced a few years ago - did improve the light absorption of each pixel, "BSI technology also faced limitations in improving image quality as pixel sizes continued to decrease." Samsung's patent-pending ISOCELL technology forms a physical barrier between neighboring pixels – isolating the pixel. This isolation enables more photons to be collected from the micro-lens and absorbed into the correct pixel’s photodiode minimising undesired electrical crosstalk between pixels – by as much as 30% compared to BSI sensors - and allowing expanded full well capacity, leading to greater dynamic range. The first Samsung image sensor to adopt this new technology, the S5K4H5YB 8-megapixel imager, is currently sampling to mobile device manufacturers with mass production scheduled for Q4 2013.