An OLED pixel is not able to represent a dot if it´s not made off one or two colors the pixel consists of.
An OLED pixel consisting of red and green, cant represent a blue dot*.
An OLED pixel consisting of blue and green, cant represent a red dot*.
Every LCD Pixel is able to represent any color composition of a dot*.
OLEDs needs normally at least 2 pixels to represent one dot* correctly it wants to display.
you have 1/3 less subpixels on an OLED screen that are not compansatet in any form, they´re just missing.
If you remember the DK1 it had a "High-Resolution-Mode" where it only used the green subpixels, as ever pixel on an oled screen can represent green.
I won´t contradict that there´s probably a mistake in calculating a useful resolution out of an oled screen. The percentage compares the amount of subpixels, the actual amount of dots ignoring the color it has. Dividing it by 3, doesn´t change anything about the amount and relations to the percentage. In the best case an oled display could represent a colored dot by 3 subpixels like an LCD screen does, thats why I divided them by 3.
Now that I´m thinking about it, the situation is probably even worse - you have to remember that LCD Panels have the same amount of R G B subpixels, where OLED has 50% G, 25% R and 25% B.
I will think about a better way to represent the resolution problem with OLED screens. The impact is really high when comparing same resolution screens.
You can ignore the paneltype-impact by just looking at the "Res".
*dot= actually meaning a pixel that the display gets send to represent
Also if you compare the vive normaly to the FHD resolution it still has just 25% more then it, which is again not much, and is still funnily low.
edit1: ok this would be a way to go, lets take the vive´s resolution of 2160x1200
2160x1200 equals a resolution of 2 592 000 pixels.
Which is true for an LCD screen, as every one of these pixels can take any color composition the pixel needs to represent. The amount of subpixels is "res*3" 2.592.000*3=7.776.000 this is the sum of subpixels where every color takes 1/3 of the amount of subpixels (R=G=B)
2160x1200 equals also a resolution of 2 592 000 pixels.
Which is not true compared to an LCD screen, as each Pixel is not able to represent every color it gets send.
So how high is the actual resolution an OLED can represent without "throwing away" pixels/colors it should represent?
again we look at the amount of subpixels, an OLED screens defines a pixel as consisting of 2 subpixels in combination of RG and BG therefore it has 2.592.000*2=5.184.000 subpixels.
But these subpixels have not an equal distribution, the amount of G subpixels equals the amount of R+B subpixels. To correct the amount of subpixel to compare it with an lcd screen we have to throw away the G ones that are not useful in recreating a pixel*, you could say they are "unnecessary" when comparing to an LCD. These make 25% of all subpixels on a oled screen. So 5.184.000*0.75=3.888.000 is the actual number of subpixels that an oled screen could use to represent pixels correctly without throwing away information. And now we can compare them to LCD panels by just dividing it back by 3 as the amount of RGB is now equal.
3.888.000/3=1.296.000 and now we have the actual resolution an oled screen can correctly display.
now comparing: 2.592.000 (LCD) to 1.296.000 (OLED). An OLED panel can exactly display half of the resolution an LCD screen can represent at the same resolution. The eff.Res. should´ve been therefore just 1/2 of res for oled when comparing to an LCD.
*because you need a pair of 2 subpixels, where every second G subpixel is useless RGBG=RGB