How does the rear projection television work?
A rear projection TV is a type of television designed to have a particularly large screen. These large-screen TVs are very popular. They are part of people’s attempt to get a great on-screen movie experience without having to go to the movies. The rear projection TV, therefore, is used as the centerpiece of people’s home theater systems. The reference to the cinema is where this big-screen TV gets its name. When traditional videos and movies are projected on a blank screen like in a movie theater, the image that is presented on a rear screen TV on the back of the screen is projected. Even though large digital TV sets are available to the general public, its high price means that this type of TV is still very much in demand. There are three types of rear projection televisions on the market: CRT, LCD and DLP.
How does a rear projection CRT TV work?
A CRT (CRT) rear projection television is the most common and least expensive of the three types of televisions of this type. It uses the technology that has existed for decades and is relatively inexpensive to repair. The disadvantage of such a TV is the large box needed to contain all the delicate electronic components and machinery, which takes up a lot of space in the house. When a CRT television is on, three small cathode ray tubes begin to produce beams of light. Each tube produces a primary color that can be combined at different intensities to represent any color in the spectrum. They light up according to the signal they receive, either through cable, antenna or satellite. These aces pass through a magnifying lens. The image produced bounces off a mirror at a careful angle on the back of the TV to project the image inside the TV screen. The reason why the image we see is the other way around is that light is reversed when it is reflected in the mirror.
How does the rear projection LCD TV work?
A rear liquid crystal display or LCD screen is generally considered to have a better image than a CRT TV. It uses more advanced technology more expensive to produce, therefore, the price is higher to the consumer. A rear-projection LCD television basically works by passing a powerful light source through a transparent LCD chip composed of individual pixels (which shows the moving video image) and projects the image through a magnifying lens towards a mirror, which in turn reflects that image on a screen.
How does a rear projection DLP TV work?
The best of the three types of TV available that has higher quality is the rear projection of Digital Light Processing or DLP (for its acronym in English). Like the LCD, the current image is displayed on a chip, however, the chip is used on a DLP projection TV differently. The chip on a DLP television is known as a DMD (digital micromirror device). In essence, each pixel in a DMD chip is a reflective mirror. The image is presented on the DMD chip. Each micromirror tilts as the image changes to create the base of the image. Color is added by means of a high-speed color wheel, which reflects lights that strike the micromirrors as they are tilted. As the amplified light bounces off the micromirrors, it is sent through the lens, reflected in a single large mirror and on the screen. Due to this intense and highly technical mechanical process, DLPs are more prone to break than the other two types of rear projection TVs.