CBD as far as I know is not a "screen". It's a standard AMOLED screen with a new filter on top. Much like anti-reflective layer but more advanced. Some really expensive plasma TVs use them. Old high-end Pioneers, Samsung 2009 model B850 series 8 plasmas etc. (other plasmas use screen filters also but isn't as advanced..) Not sure who makes the CBD filter though. I assumed the AMOLED is made vy Samsung. But not sure.
I don't think Samsung has a shortage anymore. New i9001 SGS1 Plus has SAMOLED again.
Samsung is only manufacturer that at the moment got enough capacity to manufacturer AMOLED screens in huge capacity as they got their plant ready and already working last month that increased AMOLED production 10x.