OLED Memory?

I was just thinking... couldn't we use passive OLED as a memory module? I mean, for each pixel, we can store RGB values (without using power except to change the data)... most people would think right off the bat that means we could represent 3 bytes per pixel... there might be a better way... not sure... but, forgetting for a second what the best way to encode the data would be -- we could save data to it (ie: just like we draw on a screen), then assuming that we are using PASSIVE OLED, then we can shut the power off without it actually loosing any data... we could read those values in (upon reboot) and re-read the values...

so, what about encoding... most obvious solution is that each pixel stores 3 bytes (RGB)... we could probably also use brightness and contrast, but let's ignore those for a second... maybe ternary... maybe holographic encoding... maybe basic compression (gzip for example)... hmmm, this could be good. could we do more than RGB? Could we have other colors as well?

wait a sec... so, RGB, we have 3 colors at 0-255 each... is that in itself a requirement? or could OLED allow for 0-100%? that could give us floating point (ie: 0.0 to 1.0)... hmmm...