Originally Posted by tgm1024
I've been wondering for a while now if this isn't related to the single sheet of OLED material (per OLED layer) that LG employs. I can conceive of a kind of emission scatter that emits through these layers at odd angles.
I wonder if the Samsung RGB standard stripe OLEDs have this. FWIW, AFAICT my Samsung Galaxy Note II OLED does not.
In the case of the Samsung OLED technology, different OLED layers for red-alone, green-alone, and blue-alone are deposited right at the outermost layer (the position of the color filters on an LCD).So the light generated is always chromatically pure and emitted right from the surface of the image plane. I would suspect that this would offer the best off-axis performance and you are confirming it for your Galaxy Note II OLED.
In the case of LCD, light is generated below the IGZO layer, then has to travel through the liquid crystal layer and the color filter layer before emitting, so intensity cannot be uniform in all directions. For an exaggerated example, a shotgun cannot shoot an equal number of pellets in all directions - it must have a 'cone'
Yellow push implies loss of blue, and the LG WOLED layers are composed of yellow and blue OLED layers. The white light which is generated has to pass through color filters, so it some sense, it is 'in between' an LCD and a pure surface-emitting OLED like the Samsung. If either the blue light is generated further back from the image plane than the yellow light (IGZO then blue then yellow then color filters) or if the effect generating blue light after yellow light has been generated (IGZO then yellow then blue then color filters) results in blue light which is more columnated than the yellow light, either of these could explain a yellow push when viewing off-angle.
I've been somewhat surprised to see all the naysayers regarding LGs WOLED technology versus the more 'perfect' emissive OLED technology of Samsung, but maybe this is the basis for that.
In some sense, LGs WOLED technology will have much, much better off-angle viewing performance than LCD, but will never be 100% as good as a 'perfect' emissive technology such as plasma or Samsung striped-RGB OLED.
Panel-to-panel variation is hard to explain and hopefully disappears with the Gen-2 WOLEDs being manufactured n the dedicated M2 line. And this issue seems to be subtle enough that I doubt it is a deal-breaker in any case (though it is a further reason that I object to the curved screen, which will turn a mild off-axis color-push into a nonuniformity issue which could be more noticable).