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PROJECTOR USAGE HOURS - DLP vs. LCD

by Phil Conner

DLP and LCD projector technologies process light in very different ways and these two techniques determine not only how they are operated, but which projector you may want to purchase. While LCD projectors may display a much brighter image than DLP in many cases - their transmissive design limits the amount of time they may be used in a set period.

The light engine design in DLP projectors use a reflective design to create the image from thousands of tiny mirrors. Therefore, the heat from the lamp does not adversely affect any of the components. The DLP units can be in operation continuously with no appreciable loss in performance. The only loss will come from the bulb slowly decaying over time resulting in the reduction of brightness. The bulb or (lamp) may then be replaced in most cases and the DLP projector will return to its original quality state.

Conversely, LCD based projectors may only operate effectively for 8-10 hours per day. When operating longer than 8-10 hours, the image will begin to depreciate and not return to its previous state. The transmissive design of an LCD projector passes light through the LCD chips then on through the optics and onto the screen. Heat is transferred to the LCD chips from the light source. The LCD chip will begin to deteriorate from a build up of this heat transfer from continuous operation. This will likely result in a tremendous image loss - reflected in skewing of colors, contrast, and overall picture quality. Practically, what is essentially occuring is that the continuous heat is slightly "melting" or bending the LCD surfaces in such a way that an etching effect can occur. This can permanently damage the LCD projector.

Projector Buying Tips:
  An Introduction to Projectors
  Product Types
  DLP vs LCD Projectors
  Resolution - which is best for you?
  Resolution - the FAQs
  Weight and Portability
  Pricing
  Brightness
  Aspect Ratio
  Other Features
  Other Considerations
  Guide to Inputs
  Lens and Optics Specifications
  Zoom Lenses
  Projector - Quick FAQs

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