I think perhaps you are referring to the OLED displays.
If you are thinking of waiting on one of these then you will either have to be loaded with cash AND very patient.
Afaik, the screen sizes only go up to 20" or something at present due to the technology, but the price is sky high. This will continue for several years I feel.
The way I see it in the consumer electronics market is that one technology has to get well placed before another comes along. So they get hundred of millions to buy plasmas/LCDs throughout the world, then invent another technology to get all these people to upgrade. Thats how the market works. People always want the latest technology.
So I would not wait - just buy your LCD now. There are some great deals out there at present, and they will improve over the next few months.