Originally Posted by JoeyBagadonuts
I think you're both wrong...or both right.
As far as I can tell you're both saying essentially the same thing:
By letting the W subpixel handle the underlying greyscale luminance (to the extent that it can) of a pixel...it allows
1) Overall lower power consumption by having a "filterless" subpixel eminate the "white light portion" of color.
2) Increases subpixel (therefore overall panel) longevity because you're not driving any single sub-pixel as hard as you would otherwise.
Except that he's missing the critical piece of information. You cannot boost the brightness of the non-saturated colors with W without skewing everything. Why? Because the overall extents of the output color space is rooted to the ground with the maximum of each primary.
That Red, Green, and Blue are the defining corners of the color space triangle. They cannot budge----they are anchored, period, end of story. As you wander toward the middle of the triangle you increasingly desaturate. You cannot use W to artificially create things brighter for desaturated colors and leave the saturated colors alone. It is not
about making things brighter. It can't be without mucking things up. Imagine a pale (white-ish) green suddenly pumping out ever more brightness even more than you normally get with desaturation, but having the solid colors lag significantly behind. It just couldn't work.
I suppose if you're more comfortable with an RGB cube (we're at the display level after all), then it might look as if the white corner is pulled. If you're comfortable with the HSB model, the desaturation point would be similarly distended.
Given an inherent limitation in brightness of the RGB triad, it's then
about lessening the power load for those. That triad is filtered, and is throwing away a lot of light. To overcome that, they likely are driving the OLED stack underneath it pretty hard. To overcome that
power drain, they are employing white.
Look, I think I've exhausted this. All the coding I've done in color model conversion just cannot make heads or tails out of desaturated colors pumped even higher than normal. So folks, believe what you want. And be well.
And above all, keep in mind (again), that this is theory vs. theory.