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The LCDs put in projection systems are generally small reflective or transmissive panels lit by a powerful arc lamp source. A series of lenses magnifies the reflected or transmitted image and casts it on the screen. In front-projection systems the LCD is placed on the same side of the screen as the viewer, but in rear-projection systems the screen is lit up from behind. Projectors of more expense and capacity can utilise three discrete LCD panels, forming separate red, green, and blue images that blend to make a coloured image on the screen.

The increasing demand for pictographic displays has granted a special emphasis on the switching speed of liquid crystals. This has led to the creation of objects utilizing smectic liquid crystals, certain types of which have a speedier electro-optical response than nematic liquid crystals. The surface-stabilized ferroelectric liquid crystal (SSFLC) display is in the current day the most complex smectic device. Inside it the liquid crystal molecules are set out in perpendicular layers to the substrate planes, which are distanced by one or two micrometres, and within the layers the molecules are on a tilt, as displayed in the figure. The host liquid crystal holds optically active molecules, and a slight outcome of the optical activity and the tilt of the molecules is the appearance 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 through the plane of the layers. Therefore, there is a permanent charge separation through the liquid crystal layer in the SSFLC, and its sign is directly attracted to the tilt direction of the molecules. An applied voltage of the corresponding sign can reverse the direction of this dipole in tens of microseconds and by doing so reverse the tilt direction of the molecules. The corresponding change in optical properties can create a change from light to dark when one or more polarizers are utilised.

SSFLC devices have been produced for big passive-matrix presentations, but their expensiveness and intricacy has impeded them from having any significant impact on the market. Small transmissive and reflective active-matrix SSFLC displays, however, have shown some possibility for use as elements in projection systems or as viewfinders in digital cameras. Their quick reacting allows them to be utilised in time-sequential colour systems, in which expensive colour filters are removed for a coloured backlight that flashes red, green, and blue in quick speed (approximately 100 cycles per second). For example, the liquid crystal might be switched to a transmissive state during the red and green periods and then to a nontransmissive state during the blue period, with the outcome that the eye sees an average of red and green light, or the colour yellow.

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