Seems to be at least 2 or 3 topics weaving themselves together on this thread, but whatever
On the original posters mis-use of the word 'transmit' when used with color filters, filters to not really 'transmit' anything, they passively filter out (block) or pass through light based on frequency (and without any control). As has already been stated, LCDs are transmissive because they actively either transmit light of block light based on electronic control (an electronic lightvalve).
If there is any difference in the light coming from an RGB OLED and a WOLED, it boils down to spectral content (as you pointed out).
very narrow/tight spectral characteristics of the RGB primaries is the most important criterion to being able to expand color gamut.
One way to tighten the spectral narrowness of RGB primaries is by using quantum dots (film or otherwise) and this is how LED/LCD are getting their color gamut a up to full DCI-P3 and beyond.
The current crop of LG WOLEDs is only able to achieve 90% DCI-P3, and this is almost certainly the reason why. Next year's crop is supposed to achieve 100% DCI P3 and this may be through a different composition of the WOLED layer that emits a 'purer' white light composed of narrower RGB primaries.
As a fall-back, a WOLED backplane can always be covered with QDF as well, so if cost is not object, there is no color gamut achievement that LED/LCD can achieve that WOLED cannot achieve as well (subject to brightness limitations).
So yes, RGB OLEDs may have the ability to produce narrower RGB primaries, and because of this, wider color gamut than current-generation WOLEDs.
My only issue with this interpretation of the OPs statement that WOLED is more 'LED/LCD-like' than RGB OLED is that 99.999% of content is based on Rec.709 where the benefits of wider color gamut are invisible (unobservable), so I don't believe that can be what he was trying to express.
My suspicion is that he is referring to the 'digital-versus-analog' image quality attributes of plasma versus LCD, which boils down to PWM (plasma) versus sample-and-hold (LCD). On that basis, WOLED looks more 'LCD-like' than 'plasma-like' because it is also sample-and-hold. But RGB OLED is also sample-and-hold, so it will look just as 'LCD-like' as WOLED on that score.
If the OP is hoping that an RGB OLED is going to look more like his plasma (or CRT
) than an LCD, I'm afraid he is in for dissapoinment.
Now if the OP is hoping that an RGB OLED may display Inside Out closer to the Rec.2020 color gamut it has been mastered in than a current-generation WOLED, their desire may hold some merit (but again, that has nothing to do with emissive versus transmissive).