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The LCDs built in projection systems are usually small reflective or transmissive panels set off by a forceful arc lamp source. A line of lenses enlarges the reflected or transmitted image and casts it onto the screen. In front-projection systems the LCD is situated on the same area of the screen as the viewer, but in rear-projection systems the screen is illuminated from behind. Projectors of greater expense and capability might use three discrete LCD panels, casting separate red, green, and blue images that blend to form a coloured display on the screen.

The growth in demand for pictographic presentations has put a special emphasis on the switching speed of liquid crystals. This has necessitated the invention of objects utilizing smectic liquid crystals, certain types of which have a faster electro-optical response than nematic liquid crystals. The surface-stabilized ferroelectric liquid crystal (SSFLC) display is currently the most sophisticated smectic device. With it the liquid crystal molecules are managed in layers perpendicular to the substrate planes, which are separated by one or two micrometres, and inside the layers the molecules are slanted, as demonstrated in the figure. The host liquid crystal contains optically active molecules, and a minor turn up of the optical activity and the shape of the molecules is the presence of a permanent charge separation, or ferroelectric dipole, comparable 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. Thus, there has to be a permanent charge separation through 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 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 in the case that one or more polarizers are used.

SSFLC devices have been produced for large passive-matrix displays, but their expensiveness and intricacy has impeded them from enjoying any particular progress on the market. Small transmissive and reflective active-matrix SSFLC displays, however, have shown some probability for use as elements in projection systems or as viewfinders in digital cameras. Their speedy responding allows them to be made use of in time-sequential colour systems, in which expensive colour filters are emulated with a coloured backlight that flashes red, green, and blue in rapid succession (around 100 cycles per second). For example, the liquid crystal could be switched to a transmissive state for the red and green periods but 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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