CRT	CRT stands for Cathode Ray Tube.
DLP	DLP is a technology made by Texas Instruments. It uses a Digital Micromirror Device (DMD) which has approximately one million tiny mirrors to reflect light that creates a digital image. This is considered to be the best digital picture you can get! DLP is said to have a fill-rate of 88%. The fill-rate is determined by how much of the image is made up of elements compared to the space in between the elements. Thus, 88% means the screen is 88% full of color, while 12% of the image is in between those elements.
LCD	LCD stands for Liquid Crystal Display. It has millions of individual LCD elements that are turned on and off to create the colors Red, Green, and Blue. If an element is turned on, light is projected through that specific LCD cell and you see the corresponding color. The fill-rate of LCD is said to be 83%. D-ILA is a type of LCD display that is owned by JVC. D-ILA, unlike LCD, uses a method of reflecting light through the elements twice before being passed to the lens. The fill-rate of D-ILA is said to be 93%. LCOS stands for Liquid Crystal on Silicon and is very similar to the technology of D-ILA, but is instead owned by Hitachi.
Plasma	A plasma screen is different in that it contains millions of compartments that contain noble gases such as Argon, Neon or Xenon. To turn these pixels on a current is passed into the compartment and they turn red, green or blue. This is the exact same technology that is used in Neon signs, except a neon sign usually only has one or two compartments of gas, whereas plasma screens have millions.

View the difference in 1080i and 1080p

Display Methods

Direct-View	A direct-view television is the basic television we are so familiar with by now. It is only called a direct view because there are now other types of TVs and the image of a direct-view monitor is drawn directly on the inside of the glass cathode ray tube (CRT). Direct-view televisions currently are less then 36 inches big and the aspect ratio is usually 4:3. Direct-view TVs are limited in their size by the manufacturing technology and the cost of shipping heavy glass tubes. Although there have been larger direct-view models before, in general, 36 inches is the limit of this type of TV.
Rear-Projection	A rear-projection television usually ranges from 40 inches to 80 inches in size. Inside a rear-projection TV is a mirror that reflects an image that is projected from the front projector to the display screen. This is done so that the actual television depth does not need to be as deep as a 2 piece rear projection set.
Front Projector	A front projection TV is a two piece unit that projects the image from the front of the TV onto a screen. It is like the technology that is used in movie theaters. With this type of setup you will have two parts to your television: 1) the projector and 2) the display screen. A front projection TV can be made with any of the following display types: LCD, CRT, DLP, D-ILA, or LCoS.
2 Piece Rear-Projection	This type of projector is like a front projector, except the image is projected onto the screen from behind instead from the front. This option is not as viable for most home theater setups, but some find it to be preferable.