A laser projector is more energy-efficient and will last longer than a standard projector. Upgrading to a laser projector has its perks, but it isn’t for everyone. Lasers also last longer than traditional lamp bulbs and don’t need time to warm up before projecting. Not only does that mean less electricity wasted, but also less heat produced. This means that less energy is needed to produce the same picture. The only light that’s produced is the light that’s needed, and because laser beams are focused in a single direction, no light is lost in transit. Other models combine a blue laser with a red LED and use a phosphor to generate green light from the blue laser light. These three light beams are then combined in a lens and prism assembly which passes the light onto either a DLP, LCD, or LCoS chip, and then through lenses for magnification and focus. The light from this laser is split into two beams, with one beam converted into either green and yellow light. The hybrid models reduce the number of lasers from three to one laser. Instead, hybrid laser models that utilize blue laser light are more commonly available to consumers. However, true RGB models are very expensive. The ideal system uses red, green, and blue lasers. This light is then diffused, hits a chip, and is magnified and focused by a series of lenses. How a Laser Projector is DifferentĪ laser project replaces the white light bulb with primary-colored lasers. However, the light cycles so quickly, that it appears to be a single, full-color image. This is why, when you wave your hand in front of a standard projector, you get a similar effect as when you wave your hand in front of a strobe light. What you are seeing is actually rapid cycling of the red, green, and blue images in quick succession. This filtered and shaped light is then passed through a series of lenses that magnify and focus the image for projection. The LCoS combines both of these technologies by laying a liquid-crystal display over a reflective layer of silicon (hence the name liquid-crystal over silicon) to give an improved contrast ratio. LCD passes the filtered light through a tiny liquid-crystal display that produces the images for each color to display, like a tiny version of what you’d find on a calculator. This filtered light then hits either a DLP, LCD, or LCoS chip to produce the colored images.ĭLP, or digital light processing, uses tiny mirrors to reflect or deflect light to produce the lighted or darkened pixels in each color. This means that two-thirds of the white light is “thrown away” when the light is filtered into primary colors. This provides the red, green, and blue light that is projected onto your screen in rapid succession to blend into one image. This light is then passed through a color wheel–a spinning wheel with filters in each of the primary colors. How a Standard Projector WorksĪ standard projector uses a white light bulb to power the projection. Unlike a standard projector, which projects white light through a color filter to generate the colors in your image, a laser projector uses laser light in primary colors, producing less wasted light. How Does a Laser Projector Work?Ī laser projector uses a light source deflected off of a chip and magnified and focused by lenses to project an image on your screen. To many people, the advantages of laser projectors outweigh the cost. Knowing the differences between standard white light projectors and laser projectors reveals why laser projectors are more efficient, but also more expensive. Once you understand the basics of how projectors work, understanding laser projectors is easy. Compared to traditional projectors, which use white light that is then filtered into colors, laser projectors are more energy efficient. Typically, a laser projector uses three lasers, one for each primary color, to project an image directly on the screen. While the technical details around all the different projector specifications can get complicated (more on that here), the basic principles of how they operate are fairly simple. There’s a lot of hype around laser projectors, but not many people understand how they work.
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