Thursday, February 8, 2007



Plasma and LCD are very expensive in the large sizes. Once you get past 42", things get exponentially more expensive. With 1080p resolutions now available on all displays, 50" will cost you almost a body part. A 40" or 42" is a lot more affordable. Going back to our concept of "perception" in the beginning and also introducing the factor of "substitution", manufacturers developed several technologies to address the "big screen" issue. Some consumers would rather have a huge 70" screen even if it means giving up quality. Enter the following display types; Rear projection LCD, LCOS, DLP, and as they use in the cinema, front projectors. Rear projection allows for the "blowing up" of the picture in a cost-effective manner. What we get is a huge screen in the 60"+ range with good performace. I stress "good", because as it stands now, quality IS substituted for size. When compared to Plasma, LCD or CRT's, colors will look washed out and far from realistic while, contrast, vividness, response times, and refresh rates, will look far from that of their counterparts. When you look at the specs for any of these screens, you will often see 10,000:1 contrast ratios or 5ms response times; similar specs to those of plasmas or LCD, but I urge you to physically look at the display. The nature of the technology, the way the picture is created, will produce a very different result despite their high end specifications. Now let's not compare them. Let's look at them for what they are. What you have is a huge screen cinema experience with a great picture! Let's look a little more indepth on each individual rear
projection technology.

REAR PROJECTION LCD: Today you see more variation on the rear-projection LCD such as DLP and LCOS. But there are still a few regular RP-LCD's on the market. RP-LCD's uses transmissive LCD chips that allows light to pass through the liquid crystal onto each individual pixel.


  • Light
  • Large Screen
  • High Contrast and brightness
  • Lower power consumption than plasma and crt.
  • Reasonably inexpensive.


  • Suffers from dead pixels
  • Suffers from the screen door effect due to the LCD panel being made up of individual pixels.
  • Colors have a washed out look
  • Not as vivid as regular LCD's.

Recomendation: The Sony KDF50E2000 50" Grand WEGA Rear-Projection LCD. One of the few actual rear projection LCD's available on the market. This model represents the best of the few available. Even against DLP's and LCOS, this model still holds its weight and its price point makes it a bargain for those who want a cheap alternative into the HDTV market. It must be noted that this is a 720p screen.