The LCDs used for projection systems are generally small reflective or transmissive panels illuminated by a forceful arc lamp source. A number of lenses expands the reflected or transmitted image and casts it on a screen. For front-projection systems the LCD is located on the side of the screen as the viewer, although in rear-projection systems the screen is lit from behind. Projectors of higher cost and capacity can utilise three distinct LCD panels, forming separate red, green, and blue images that mesh to form a coloured image on the screen.
The increase in demand for pictographic displays has had a growing emphasis on the switching speed of liquid crystals. This has led to the development of devices employing 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 currently the most sophisticated smectic device. Inside it the liquid crystal molecules are set out in perpendicular layers to the substrate planes, which are differentiated by one or two micrometres, and throughout the layers the molecules are on a slant, as displayed in the figure. The host liquid crystal has optically active molecules, and a subtle outcome of the optical activity and the tilt of the molecules is the appearance of a permanent charge separation, or ferroelectric dipole, likeable 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 has to be a permanent charge separation throughout the liquid crystal layer in the SSFLC, and its sign is directly paired to the tilt direction of the molecules. An applied voltage of the right sign can reverse the direction of this dipole in tens of microseconds and in so doing reverse the tilt direction of the molecules. The respective change in optical properties can create a change from light to dark if or when one or more polarizers are used.
SSFLC devices have been commercialized for larger passive-matrix presentations, but their high cost and intricacy has impeded them from enjoying any particular impact on the market. Small transmissive and reflective active-matrix SSFLC displays, however, have displayed some possibility for use as aspects in projection systems or as viewfinders in digital cameras. Their immediate reaction allows them to be made use of in time-sequential colour systems, in which high cost colour filters are emulated by a coloured backlight that flashes red, green, and blue in rapid pace (approximately 100 cycles a second). For example, the liquid crystal may be switched to a transmissive state for the red and green periods then to a nontransmissive state during the blue period, displaying the outcome that the eye sees an average of red and green light, or the colour yellow.
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