I was asked in the Intel thread to post about the difference between analogue and digital LCoS.
The analogue side is what JVC and others have been doing for some time and there is good information out there about this technology.
This image comes from the Sony press release about SXRD, and does a good job of showing how an LCoS cell is layered.
Those technical amongst you will recognise the architecture - it looks a lot like a DRAM cell! And it works along the same lines.
Essentially a voltage is written to the pixel and stored on the capacitor - this in turn causes the LC to align according to the voltage.
However, the voltage on the capacitor will decrease over time, so they need to understand three things - the voltage they want to write, the rate of decay and the time between pixel refresh. So they need to write a higher voltage so that the average voltage on the LC gives the grey scale level that they desire.
So, the faster they update the screen, the better off they are. The slower that they write, the higher the drive voltage needs to be in order to be the correct average voltage.
Ok, now let's imagine for a second that white is represented by voltage Vw and that the higher the voltage, the whiter the LC will get (this is not always the case, but it is easier to think of it this way).
So, for argument, a full white can be achieved by Vw = 4.5 volts or greater across the LC. So for an analogue system to write a white pixel, they need to write say 5.5 volts to the pixel so that as the voltage decays, the average is going to be 4.5 volts. Remember this part when we start talking about the digital system...
Disclaimer: These comments are all my opinion and do not represent any official stance from eLCOS. I am just an engineer - sometimes I think that the marketing guys would prefer it if I didn't talk to anyone...!