LCD displays can not burn in. CRT moniters [be it curved or flat] can burn in. and plasma can burn in too...
there is no materal that is consumed in the making of an image on a LCD display. on a crt or plasma display, the phosfer on the screen surface gets excited by an electron beam. when the image burns in, that area has been excited to the point of it no longer being able to light up with the same brightness as the area around it. on a LCD, there are little liquid crystals triads that get excited by electricity to give off color one of 3 colors [red, green or blue] if all are on you have white, all off black, and mix's of the colors and their frequency will give you all the other colors. those LCD moniters do have a backlight that can burnout [with no back lighting, expect a very dark image. kinda like looking at a slide, with no backlighting]
so if you are wanting a true LCD display [thin kind, not those flat screen CRT's] you don't need to worry about burn in. , just backlight burnout
edit
**********
most of the info i know comes from crt and lcd data/home theater projectors. crt tubes for projectors are a lor of $$$. usually around one fifth the price of the projector [60k projector, 10-12k for a crt tube]. lcd lamps are not cheap either... 500-2500 cdn each
edit again
**********
to make tv's and computer moniters last longer, keep the contrast and brightness down. the higher the brightness/contrast setting, the shorter the expected life. crt tubes have an average lift of 20k hours. at full brightness/contrast, you can easily take off 3,000 hours. at lower settings [±60% on both] you can add like 5,000 hours to that life...