LCD Projectors use lighted liquid crystal displays to make the dots which are then in turn projected onto your screen. LCD projectors can have a high resolution, as high as a computer monitor (which is much higher than a television.) A TV has about 300 horizontal lines, whereas an LCD projector can have as many as 1200 or more.

CRT Projectors use the carthode ray tubes like televisions to create the image that is projected onto the screen.

LCD Flat Panel The Operation of a LCD direct view display is similar to that of a slide viewer - the LCD panel, like a slide, is in front of a back light.  The LCD panel is an electronic grid, where each hole in the grid can be electronically opened and closed to let red, green, and blue light come through, creating an image.

Plasma technology Plasma televisions can be made so thin because they do not use tubes.  The picture is created by using tiny mirrors and blue, red, and green phosphors.  The plasma gas contained within each cell serves as an electrical medium, to switch the phosphors on and off.  As the cells are charged by the plasma gas, it emits ultraviolet light that is produced into one of almost 17 million colors.

DLP  DLP TVs consist of a chip that contains thousands of tiny mirrors.  Each mirror represents a single pixel.  In a DLP projector, light from the projector's lamp is directed onto the surface of the chip.  The mirrors move back and forth, directing light either into the lens path to turn the pixel on, or away from the lens to trun the pixel off.  In higher-end DLP projectors, there is a 3-chip system that allows for each chip to serve as the red, blue, and green channels.  In a one-chip system there is a color wheel that consists of a red, green, blue, and in some cases, a white (clear) filter.  This wheel spins between the lamp and the chip, and alternates the color of the light hitting the chip.  The mirrors tilt away from or into the lens path based upon how much of each color is required for each pixel.  This activity modulates the light and produces the image projected onto the screen.

LCD projection- LCD displays contain 3 separate glass panels, one each for red, blue, and green comonents of the image signal being ged into the projector.  As the light passes through the panels, individual pixels can be opened to allow light to pass through or closed to block the light.  This activity modulates the light and produces the image projected onto the screen.

LCoS  Liquid Crystal on Silicon- LCoS is somewhat of a combination between DLP and LCD.  It is a reflective technology that uses liquid crystals instead of mirrors.  Liquid crystals are applied to a reflectrve mirror.  As the liquid crystals open and close, the light is either reflected from the mirror below, or blocked.  This modulates the light and creates the image.  Typically 3 LCoS chips are used in this form of projection, one each for red, blue, and green.