Lamp based – DLP: Digital Light Processing Projector
- One of the oldest technologies used in projectors.
- Uses a DLP chip with millions of microscopic mirrors that create a dark or light pixel. The color is added by a beam of light that is passed through spinning color wheel before feeding into the DLP.
- Major strength is, no color decay, no misalignments that can occur in DLP
Lamp based – LCD: Liquid Crystal Display Projectors
- Same technology that we see in many LCD screen starting with digital wrist watches, alarm clocks and so on.
- In this, white beam of light is first separate the white beam into Red, Green, Blue lights which a LCD panels and finally combined into white light.
- Major strength is, more stable and reliable, and less expensive to buy but have maintenance costs.
LED Based – LED: Light-emitting Diode Projectors
- They can also be either DLP or LCD but they use LED as light source
- LED life is about 20,000 hours vs. Lamp life of 1000 to 5000 hours.
- Cast can be cheap to high. But least expensive in maintenance.