With LCoS displays, the process is similar to 3LCD, in that you start by splitting the light into three beams. A key difference, though, is that LCoS (Liquid Crystal on Silicon) is a reflective panel (like DLP) rather than transmissive (light passing through it), like the 3LCD panels. So, light bounces off of the LCoS panels, then to a dichroic prism (like 3LCD) to recombine the light into a single, full-color image.
LCoS imagers have a higher pixel density than their DLP or LCD counterparts so a smaller LCoS chip can produce more resolution. This is why most native 4K Home Theater projectors utilize LCoS chips.
How LCoS Works
What this means is about is 8 million pixels, each producing an individual element of the picture. There are other ways of displaying 4K. Technologies like DLP’s wobulation and LCD’s pixel-shifting are some examples. But are these native 4K? It’s something of a debate in the industry. Is native resolution determined by how many pixels you can see on the screen or how many pixels or mirrors exist on the chip? You’re going to have to be the judge of that because it’s about how you perceive the picture.