The LCDs built in projection systems are usually small reflective or transmissive panels lit by a bright arc lamp source. A series of lenses magnifies the reflected or transmitted image and sends it on the screen. In front-projection systems the LCD is placed on the side of the screen as the viewer, while in rear-projection systems the screen is lit up from behind. Projectors of higher cost and performance sometimes utilise three distinct LCD panels, forming separate red, green, and blue images that combine to form a coloured picture on the screen.

The increasing demand for film displays has put a particular emphasis on the switching speed of liquid crystals. This has required the creation of devices utilizing smectic liquid crystals, some of which have a faster electro-optical response than nematic liquid crystals. The surface-stabilized ferroelectric liquid crystal (SSFLC) display is at this time the most developed smectic device. Inside it the liquid crystal molecules are arranged in layers perpendicular to the substrate planes, which are separated by one or two micrometres, and in the layers the molecules are tilted, as displayed in the figure. The host liquid crystal holds optically active molecules, and a scarcely perceptible result of the optical activity and the shape of the molecules is the presence of a permanent charge separation, or ferroelectric dipole, analogous to the ferromagnetic dipole of a magnet. The direction of this dipole is perpendicular to the tilt direction of the molecules and in the plane of the layers. So, there must be a permanent charge separation across the liquid crystal layer in the SSFLC, and its sign is directly paired up to the tilt direction of the molecules. An applied voltage of the correct sign can reverse the direction of this dipole in tens of microseconds and so reverse the tilt direction of the molecules. The consequential change in optical properties can effect a change from light to dark if or when one or more polarizers are employed.

SSFLC devices have been commercialized for big passive-matrix displays, but their high cost and complex detail has stopped them from having any great progress on the market. Small transmissive and reflective active-matrix SSFLC displays, however, have some probability for use as aspects in projection systems or as viewfinders in digital cameras. Their fast response allows them to be made use of in time-sequential colour systems, in which dear colour filters are replaced with a coloured backlight that flashes red, green, and blue in fast pace (approximately 100 cycles per second). For example, the liquid crystal might be switched to a transmissive state for the red and green periods and to a nontransmissive state in the blue period, displaying the upshot that the eye sees an average of red and green light, or the colour yellow.

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