Type of HDTV Display

Saturday, April 30, 2011

With complete of the variant TV display technologies on the market now ( Plasma, DLP, LCD, etc. ), it is principal to know the first pro’s and con’s of the display technologies used in manufacturing High Definition TVs. First, here are the ruling types of displays available present:

 - Direct view tube CRT
 - Flat panel LCD
 - Plasma
 - Rear projection LCD
 - Rear projection DLP
 - Rear projection CRT
 - Rear projection LCoS

What makes a plasma TV better than a direct tube CRT? Why would I pick a rear - projection TV over an LCD? Each type of display has likely advantages and disadvantages associated with the technology used in manufacturing the display. The following adviser provides a summary which should help you know relevant points to consider when deciding which HDTV display type is great for you.

 Direct-view CRT HDTV Displays

CRT stands for “cathode ray tube " and is the type of TV we are all most recognized with. Chances are, if you have a TV that is 5 or more years old, you have a CRT TV. Despite their age, CRT displays still approach a lot of bang for your buck.

The main advantages of CRT’s include:
 - Flat screen – which provides wide viewing angles ( most new CRT’s built now have flat screens, but you will stilled find a few that have are manufactured with curved screens )
 - Famous picture quality
 - Relatively inexpensive in all sizes
 - No danger of burn - in
 - Capable of producing true blacks

Sounds nice, so why are CRT displays losing market share new display technology like plasmas and LCD’s?

 - Bulky size and very heavy weight
 - Maximum screen size is limited to approximately 36 "

To present you an idea of what is meant by “bulky " and “very heavy ", a normal 27-inch flat screen CRT will weigh around 100 - 120 lbs, a normal 30-inch flat screen CRT will weigh about 150 lbs and a common 36-inch flat screen CRT will tip the scales at about 200 - 225 lbs. At over 200 lbs., that kind of weight is going to require at least 2 heavy people to lift it up onto the TV stand.

CRT’s are also much larger in terms of depth. A common 27-inch CRT measures 20-Inch deep, a normal 34-inch CRT measures 24-inch deep, and a normal 36-inch CRT measures 26-inch deep.

Why should I choose a flat screen CRT over a curved screen CRT?

 The answer is two - district:
 1 ) Having a flat - screen will allow for wider viewing angles, so that you can those people sitting on the left and right sides of the TV also have a good view of the images going on displayed.
 2 ) Having a flat screen liking allow you to view the image as it was meant to be seen, without any of the growth in images that is associated with a curved tube. A curved tube has regular flaws that cause the picture to be “stretched " as it reaches the edges of the screen. While this may not be an important element for you, I would encourage you to look at a flat screen and a curved screen side - by - side. The variance in picture quality will be much more solid.

Flat panel LCD HDTV Displays

LCD stands for Liquid Crystal Display and is the type of TV you will be known with if you have seen the flat - panel LCD monitors used with many newer computers. The same technology is also used in LCD TV’s.

The main advantages of LCD’s include:
 - Flat screen – but see below for note on the viewing angles - Thin, lightweight and stylish looking
 - High resolution and excellent image quality
 - No danger of burn - in

 Flat panel LCD’s main disadvantages: - Relatively narrow viewing angles - Expensive in sizes over 30 " - Incapable of producing true blacks

 To give you an idea of what "thin" and "lightweight" means, a normal 27-inch to 30-inch LCD will weigh about 40 - 50 lbs, a 32-inch LCD will weigh about 50 - 55 lbs, a 37-inch LCD will weigh about 60 - 65 lbs. These types of TV 's are thin and light enough to be hung on a wall.

Plasma HDTV Displays

While plasma displays used to be much too worthy for the average Sunday football fan, they have come down in price enough to become a very good choice for many HDTV shoppers. Having said that, you will more than likely still pay more for a big - screen plasma TV than a similarly sized rear - projection display. What makes plasma TV’s so attractive?

 - Flat screen with very wide viewing angles
 - Very thin and lightweight
 - High resolution with deep, saturated colors
 - Excellent picture quality ( especially for home theater )
 
Plasma’s main disadvantages:
 - Fairly valued compared to other HDTV display types
 - Slight potential for burn - in
 - Limited lifespan

To clarify "thin" and "lightweight", a common 42-inch plasma will weigh between 50 - 90 lbs, a 50-inch plasma will weigh about 80 - 110 lbs. These types of TV 's are thin and light enough to be hung on a wall.

Rear projection HDTV Displays

Rear projection TV 's are an careful choice for a large sized TV and they still offer excellent image quality. They are, however, too sizeable to be hung on a wall and work best when placed on a TV stand ( or on the floor in the case of rear projection CRT's ). The most economical type of rear projection display is the rear projection CRT.

Rear projection CRT HDTV ' s offer:
 - Flat screen
 - Relatively low cost
 - Excellent image quality ( especially for home theater )

Rear projection CRT’s main disadvantages:
 - Very heavy and very bulky
 - Narrow viewing angles
 - Picture visibility suffers in brightly lit rooms

Very weighty and bulky is a nice way of saying that rear projection CRT 's are HUGE. A normal 48-inch rear projection CRT weighs 150 lbs. and is a little less than 24-inch deep, a common 56-inch rear projection CRT weighs almost 200 lbs. and is over 2 feet deep, a typical 65-inch rear projection CRT weighs 300 lbs. and is over 2 feet deep, and a standard 73-inch rear projection CRT weighs over 400 lbs. – now THAT is a huge TV!

Rear projection LCD, DLP and LCoS HDTV Displays

These types of rear projection HDTV displays are also referred to as microdisplays. They work by using a lamp that bounces light off of or through a tiny pixel - filled microchip and onto the screen.

Rear projection LCD’s offer these advantages:
 - Flat screen with nice viewing angles
 - Thin and lightweight compared to CRT
 - Not susceptible to picture burn - in
 - No "rainbow effect" artifacts that are sometimes found in rear - projection DLP TV 's
 - Excellent image quality ( especially for home theater )

Rear projection LCD’s main disadvantages:
 - Fairly worthy
 - Slight delay when powering up
 - Lamp replacement required periodically
 - Possibility for "screen door effect " artifacts

Rear projection DLP’s offer these advantages:
 - Flat screen with gentle viewing angles
 - Thin and lightweight compared to rear projection CRT
 - Not susceptible to image burn - in
 - No "screen door effect" artifacts that are sometimes found in rear - projection LCD TV 's
 - Excellent image quality ( especially for home theater )

Rear projection DLP’s main disadvantages:
 - Fairly expensive
 - Slight delay when powering up
 - Lamp replacement required periodically
 - Possibility for "rainbow effect" artifacts

LCoS, D - ILA and SXRD

These technologies are all variations on the same manufacturing process that utilizes liquid crystal on silicon ( hence the acronym LCoS ). However, implementation of this display technology differs significantly from one manufacturer to the next, so it is impossible to lay out common pro’s and con’s of the technology itself. Each TV with this type of technology will have different characteristics for image quality, viewing angle and cost. I recommend researching each manufacturer and their specific models featuring LCoS in order to compare their benefits and drawbacks to other display types.

Conclusion

There are lots and lots of choices online and in stores today for new TV’s. Enter into the television section of any Best Buy or Circuit City and you’ll get bombarded with a myriad of options for plasma, LCD, direct - view tube and rear - projection TV’s. What you choose for your new TV will either brings you hundreds of hours of enjoyment watching movies, sports and news or will bring you many hours of frustration by not choosing the best type of TV for your needs. My hope is that this information will give you the learning, and the trust, to make the well selection for your next TV purchase.