Whats the difference between WLED and LED in displays

Okay, I'll take a stab at the RGB question. The backlight of the screen used to be cold cathode type bulbs. Think super thin flourescents. The problem is that they were power hungry. The next generation used a white light LED to save on power. The problem is that there is no such animal as a white LED. The LED is actually a yellow LED with a blue coat. Sometimes that creates a slight shift in color. Slight yellow or yellow green tones are common. You display may show this shift with slightly off color images.

RGB uses pure color Red/Green/Blue LED's. When you focus them together, they create a true white light and this focused through the display should create brighter, truer colors.

This depends on the manufacturer. I was able to swap out the 1680x1050 w/ CCFL backlight display in my notebook with a 1920x1200 w/ LED backlight -- but I had to make sure the new panel would mate with the same inverter and cable. My original panel was LG, but the replacement panel was a Samsung. The model numbers and compatible replacement part numbers specified by the manufacturer made it easier finding panels that mate. The 1920x1200 panel wasn't offered for my machine, but was a compatible Dell part.

The cable that comes off of the motherboard branches off in a Y-split, a smaller connector carrying power to the inverter, and a larger connector that goes to the panel itself carrying display data (LVDS). Making sure the panel mates with your existing step is crucial.