Prices of Plasma, LCD and even LED flat panel displays have dropped drastically which have tilted the balance between affordable flat panel display screens vs. projector screens.
For obvious reasons, flat panel displays are much preferred due to its imagery performance. There is no brightness loss like a projected image and its contrast performance can be better appreciated. The only reason users are holding back on large flat panel displays is their cost.
Projectors can easily achieve image sizes from 100” to 300” with a relatively low price. Despite the current low prices in flat panel displays, it is still restricted to categories of 42” and below; cost of anything larger than 42” increases in an exponential rate. So despite better image quality and performance, their pricing is still a huge deterrent for large image users.
Projector manufacturers have also been developing brighter products, better performance and lower prices. It will be a tough battle for large panel displays to replace the projector market. However, slowly but surely, they are creeping closer to breach the large display market.