I used to have an overhead projector when i was younger. I took apart a portable dvd players LED and took off its backlight and stuck the LCD panel over the surface to watch movies. It took a powerful halogen lamp that produced alot of heat. Other times id let my brothers scribble with dry erase markers on the glass to shine drawings on the wall. Fun times
These days i just have a collection of video projectors. Latest one is a casio laser projector. Acts like DLP by Using a blue laser which combines with red light from a Red LED bulb, shines onto a wheel with green phosphor and a space and goes to the DMD chip. It is rated for up to 20000 hours. So far its on 8000
How is the color saturation on your projector?