LCD screens are available in a wider range of screen sizes than CRT and plasma displays, with LCD screens available in sizes ranging from tiny digital watches to very large television receivers. LCD screens have replaced heavy, bulky cathode-ray tube (CRT) displays in nearly all applications. LCD screens are also used on consumer electronics products such as DVD players, video game devices and clocks. Small LCD screens are common in LCD projectors and portable consumer devices such as digital cameras, watches, digital clocks, calculators, and mobile telephones, including smartphones. LCDs are used in a wide range of applications, including LCD televisions, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage.
Optical filters are added to white on blue LCDs to give them their characteristic appearance. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. For instance: preset words, digits, and seven-segment displays, as in a digital clock, are all good examples of devices with these displays. LCDs are available to display arbitrary images (as in a general-purpose computer display) or fixed images with low information content, which can be displayed or hidden. Liquid crystals do not emit light directly, instead using a backlight or reflector to produce images in color or monochrome. (In a backlit LCD, this layer is replaced or complemented with a light source.)Ī liquid-crystal display ( LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers.
Vertical ridges etched on the surface are smooth. The shapes of these electrodes will determine the shapes that will appear when the LCD is switched ON. Polarizing filter film with a vertical axis to polarize light as it enters.
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