Originally Posted by Melkior
It seems that the blue sub-pixel switch on and off more rapidly than the two others
Yes, that's exactly what I've found with my TH-50PHD8UK. I suspected these "rainbows" were really a pixel response time issue, since what I was seeing was very similar to LCD pixel response issues.
Using the GUN setting in my 8UK's service menu I too can demonstrate this clearly given any appropriate scene, in my case a 3D video game with a free-look camera. Blue responds very quickly, Red is somewhat slower, and on my set Green is surprisingly slow compared with the other 2.
The effect is typically a blurry, yellow smear and not a rainbow at all. It doesn't have anything to do with wearing glasses or having particularly acute vision - the TV is physically displaying yellow-hued pixels for visible lengths of time.
When a pixel is White (R=255, G=255 B=255) and is instructed to turn Black (R=0 G=0 B=0), B reacts near instantly, whereas R and G have visible decay times. During this time, while R and G are still being output on the screen in the absense of B, and slightly dominated by the slower G, a yellowish hue is produced somewhere in the neighborhood of this forum's post text (but a tad more greenish-sikly yellow, like THIS