While most projectors are grouped under the umbrella name 'LCD Projector,' there are actually three different light technologies which enable a machine to project a computer image onto a screen. Though not substantial, the differences among these technologies are important to recognize when comparing similarly priced models. These LCD projectors operate by shining light through a transparent panel of LCD cells.
Tiny transistors control each LCD cell, changing their polarity to produce the appropriate color.
Together, these LCD cells combine to display the desired image. Since single panel LCDs are relatively easy to produce, models that use this technology tend to be on the cheaper side. As is usually the case, though, a less expensive single panel LCD projector will have a lower color quality than its more expensive counterparts. One of the key advantages of this design is that it tends to produce more highly-saturated colors that the other technologies. At the same time, if you're interested in projecting the brightest image possible, or will be using video extensively in your presentations, a projector with DLP technology will be more suited to your needs.