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A liquid crystal display (LCD) is a flat panel display or other electronically modulating optical device that utilizes the light modulation properties of liquid crystals and polarizers. Liquid crystals do not emit light directly,[1] but instead use backlights or reflectors to produce color or monochrome images.  LCDs can be used to display arbitrary images (as in general computer monitors) or fixed images with low information content, which can be displayed or hidden. For example: preset word, number, and seven-segment displays, like in a digital clock, are good examples of devices with these displays. They use the same basic technology, except that arbitrary images consist of a matrix of small pixels, whereas other displays have larger elements. The LCD can be normally on (positive) or off (negative), depending on the arrangement of the polarizers. For example, a character positive LCD with a backlight will have black letters on the background the same color as the backlight, while a character negative LCD will have a black background with the letters the same color as the backlight. Filters are added to the whites on the blue LCDs to give them their unique look.