It means "Liquid Crystal Display", liquid crystal display. This technology is mainly used in screens for laptops. As for many projectors use 3 panels with a prism to generate the image. This technology in projectors is rich in color and a lamp requires less power than in the DLP technology.

The technology in liquid crystal displays is one of the methods used in the construction of flat screen televisions. The light is not created by the liquid crystals, but by a light source (bulb) located at the rear of the display, which emits light through the screen. This includes two polarized panels and a liquid crystal solution between the two. An electric current passing through the liquid causes the crystals to align so that light can not pass through them. Each crystal acts like a shutter, to permit the passage of light or to block it. The pattern of transparent and dark crystals forms the image.

Since the particles (or crystals) themselves do not give off any light, this is known as a “non-emissive” technology. This means that a LCD TV does not give off radiation like older versions of the TV. Light is given off by fluorescent tubes that are behind one of the polarized panels. This unique technology allows LCDs to be thinner than their rival plasma screens as well as be lighter and more durable.  Advancing technology will soon be allowing for a larger screen size in order to compete with plasmas.

LCD technology is used in flat TVs, for front projection and projector. LCD uses liquid crystals, one for each pixel, on glass panels. Light passes through these LCD panels on the way to the lens and is modulated by the liquid crystals as it passes. Thus it is a "transmissive" technology.

Its main drawback is that there is a grid between pixels, which in resolutions lower as SVGA, is visible at a distance close to the screen, and get away, it gives a shadow effect.

The new equipment with this technology have the lowest grid, and with resolutions higher than SVGA and is almost imperceptible.

In projectors for home theater there is a new technology called "Smooth Screen" from Panasonic, which reduces the grid through a lens of diffraction.

LCD panel:

In projectors for home theater there is a new technology called "Smooth Screen" from Panasonic, which reduces the grid through a lens of diffraction.

Differences between LCD and plasma screen TV or LCD and DLP projector