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Author Topic: DLP or LCD  (Read 1344 times)

Chuck Fudge

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DLP or LCD
« on: January 12, 2012, 11:23:00 am »

While investigating the purchase of new projectors, I was surprised to see many LCD options.  Currently planning the replacement of single chip DLP, 5000L projectors (Panasonic 5600U).  We want to increase brightness, but the budget may not allow for single or 3 chip DLP models that are in the 8-10000L catagory. 

Primarily, we are projecting computer generated images, mostly power point.  Secondary functions include video playback and IMAG camera images.  Nothing HD has hit us yet.  Most signals are fed from a Analog Way Pulse...RGBHV.  Occasionally we transmit RGBHV through Twisted Pair transmitter/receivers.  4:3 is our standard screen aspect ratio.

In readers opinion, what would we sacrafice by going back to LCD projection in the 8-10000L catagory?  What type would be more viable to have in inventory assuming a 3-5 year replacement schedule?  What else should I consider?
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Brad Weber

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Re: DLP or LCD
« Reply #1 on: January 12, 2012, 04:57:20 pm »

What is the application(s)?  LCD and DLP both have potential pros and cons, many of which may be of little or no significance except under certain conditions or in specific applications.

For example, while LCD has definitely closed the gap significantly, DLP still generally offers better contrast.  However, in a typical classroom, conference room, worship center or other similar application the ambient lighting is likely going to so dominate the actual image contrast that the potential differences in the projector contrast ratio may be of no relevance.  How much difference does a 5,000:1 versus 1,000:1 contrast ratio for the projector make if the image contrast ratio due to the light levels in the room is 10:1 or lower?  In comparison, in a cinema or home theater application with very low ambient light levels on the screen the projector contrast ratio may be more relevant.

Another example is that LCD still has issues with the 'screen door' effect where you can see individual pixels more easily, however that is much more an issue where the image is large compared to the viewing distance and not usually as much of a concern is larger scale applications.  On the other hand, DLP projectors have a sealed light engine and can be compact and light, a potential factor in some applications where the physical size, weight and/or environment conditions may be a concern but not necessarily a factor in other applications.

Some DLP supporters make a big deal of the potential color degradation of LCD projectors and LCD projectors can indeed develop a yellow or green tint over time.  However, how much time and under what conditions is open to debate and this would likely be much more relevant to projectors used in 24/7 applications than to those used a couple of hours a day.

I could go on about differences such as rainbow effect, color saturation and so on but the point is simply that the impact of the related pros and cons depends on the application and that for many 'commercial' applications many of the differences may not even be worth worrying about.
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Chuck Fudge

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Re: DLP or LCD
« Reply #2 on: January 18, 2012, 11:43:08 am »

What is the application(s)?  LCD and DLP both have potential pros and cons, many of which may be of little or no significance except under certain conditions or in specific applications.

Mostly rear projection 10.5 x 14 screen.  Portable setups.  Audience is usually 15' - 18' from screen.  Indoor.  Standard stage lighting levels.....think corporate.  Power point, IMAG and video rolls.   
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