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How Does an LCD Video Projector Work?Movie enthusiasts are turning their family rooms, dens, or living rooms into home theaters using LCD video projectors. In reality, you do not need a load of fancy equipment. All it takes is a white or pale gray wall, LCD video projector, your cable or satellite box, and DVD player.
To best understand how an LCD projector works, you need to understand what “liquid crystal displays” are. The terminology “liquid” and “crystal” seem to be opposites. You cannot have a solid object and a liquid object in the same form. Think of liquid crystals like ice cubes. The solid object becomes liquid with the addition of a little heat. The same is true for liquid crystal displays; the heat of a halogen bulb changes the crystal to a flowing liquid.
LCD (liquid crystal display) video projectors come in a box shaped piece of equipment. Inside the box are three LCD panels. In the center of the video projector is a halogen light. Three LCD panels surround this halogen light. As the halogen light heats up the liquid crystal, the crystals expand allowing more light to filter through each panel. The intensity of the heat causes the differences in tones. As they cool, the crystals contract causing dark or gray shades.
Images travel from a cable/satellite box or DVD player to the tube within the video projector. Those images bounce onto a small interior screen that is coated with phosphor. Each fragment of light that hits this screen is called a pixel and then breaks down into its color component, red, blue, or green.
With an LCD video projector, voltage alters the intensity of the flow of the halogen light against the LCD panels. This causes the subtle tones of a pastel or the brilliant tones of ocean scenery. In reality, with voltage changes taken into consideration, the three LCD panels (red, blue, and green) have the capability of producing more than sixteen million different colors and hues. It sounds amazing, but it is true.
One panel handles the pixels created by all shades of red. The next panel attracts green shades. The third panel attracts blue shades. As the halogen bulb heats the LCD, the color images travel as three separate beams through the projector lens onto a blank wall or a specially crafted projection screen. On the wall or projection screen, the color rays layer on top of each other to form the high quality movie images that you expect in a theater setting.
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