Originally Posted by tgm1024
1: a potential even wear (because everything starts as blue)
Actually, it has no potential for even wear.
, and 2: a potentially cheaper production process because there's only one type of OLED they have to create. I have no idea at what stage they add the filters.
A dramatically cheaper process because they vapor deposit the entire layer of OLED without any pixels whatsoever. Samsung has to push the OLED material through a screen which has to be scanned across a large substrate to avoid sagging (from a large screen). LG has no screen, they just deposit a layer over the whole substrate.
Note: at one point there was some information from LG that implied that there were no subpixels at all. Strictly speaking this is impossible, because to get a varying red/green/blue, you have to supply separate regions with differing amounts of electricity. This means subpixels. So I have no idea where that business came from, and I haven't seen any documentation that explains it.
So, you're still confused then.
There are no OLED subpixels made on the display in any conventional sense. The TFT backplane is made with subpixels... The transistors they excite a bit of OLED material that is a "subpixel's worth". That material is always "white", but represents a subpixel that will ultimately be red, green, blue or white depending on the color filter in front of it. The color filters sit above the OLED layer in much the same way they sit between you and the light in an LCD (which is also white, of course).
In some very loose sense, LG's OLED resembles LCOS in that the pixels are not directly patterned in the active layer.
Strictly speaking, what you consider "impossible" is what's going on. The transistors feed the OLED layers exactly the same for each subpixel, with the only difference between a current modulation to determine intensity (let's say it's 0-255, though I'm not strictly sure what shenanigans are going on that may make them a bit different). Colors are made by mixing sub pixels like in all flat panels but within
a subpixel there is no internal modulation.