The projection television is very common in the current household equipment, and the larger family usually chooses to install the projection television, which can be described as a projection television if the image is reflected between the screens of the wall. This projection is very well suited to choose when watching a movie. Normally, families with smaller televisions would choose to install such large-screened projection televisions, which seem extremely convenient, like being in a cinema。
Rationale:
Traditional television produces images using cathode ray tubes (crt)。
Crt shoots a bunch of electrons on a screen with fluorescent powder coatings. Every time an electron touches the screen, the point of contact that we call pixels will shine. Coloured crt televisions use three electronic beams and separate fluorescent powder to obtain red, green and blue. When we watch television, we watch the surface of television for the creation of images. That's why traditional crt tvs are called visual monitors。
Crt is highly reliable and of good quality. But they also have a major disadvantage - because the screen is made of glass, the size is limited. The biggest crt screen is only about 40 inches. Traditional television screens are thick and heavy and clumsy。
This is the main reason why the television projector was born. Although some of the machines are not comparable to the graphic crt, they can be much larger than the latter. The projection television does not use visual devices, but first creates a small image and then displays that image at a much larger size using a lit of light。
There are two main ways to project television: right and back。
The active projection system uses a projector and a single screen to project images to the front of the screen. The device looks very similar to the one in the cinema: the projector is completely separated from the screen. The projector may be placed on a table or mounted with a ceiling. The images are shown on high-quality screens with the best sense of view, but specially painted flat walls are also available。
It looks more like traditional television. They show the images on the back of the screen rather than on the front, while the projector is fully embedded in the television. With a projector and a special screen, you can also assemble a back-to-back system, but the word "back-to-back" is usually used to describe integrated television。
Both methods use micro-equipment that produces very delicate images. The equipment may be reflective, i. E. The light receives the image by reflecting back from the device. It can also be trans-radiotyped, i. E. The light obtains the image by crossing through the device. Once the light gets the image, the lens magnifies the image and projectes it onto the screen。
Transmittance projection types include crt and lcd. The following is a brief summary of its working principles:
Crt: crt projector uses a much smaller catheter than standard television. These tubes are created in the same way as standard tv - e-mailing on screens of fluorescent powder coatings。
Crt projectors may include:
A colour crt with red, green and blue fluorescent powder
A black and white crt and a colored rotation wheel
Three crts each for red, green and blue
Dlp: dlp projectors use digital microscopes (dmds), a rectangular device consisting of several microscopes, to produce images. Depending on whether the corresponding pixels need to be shallow or deep, the mirror will be directed towards or back towards the projection lens. Most dlps have a dmd and a rotation wheel for coloring. Some positive input devices use separate dmds for red, green and blue. For all information about dlp tv, see the dlp tv working principles。
Lcos: lcos uses both reflection and penetrating, like a combination of dlp and lcd technology. In the lcos tv
The light source passes through the liquid crystal layer and returns from the reflecting surface. When the light returns through the lcd, the crystal acts as a light valve, creating a light and dark area of the image. Most of the lcos projectors used separate devices to obtain red, green and blue, which were then combined with lenses。
A tablet is also an option for those seeking a larger television. Plasma and surface transfer electronic launcher (sed) televisions can provide very large images of a device of just a few centimetres thick. The tablet ccd tv is another option, but its size is limited to about 40 inches。
The three types of tablet tv are usually more expensive than most projectors. In addition, plasma screens are easily aging - if the same image is maintained on the screen for long periods, they may leave permanent branding of plasma screens. For more information, please refer to the lcd working principles。
In addition, there are other television technologies of lesser visibility, such as raster valves. But if you are buying a projection television, you are most likely to see a tv that creates images using crt, lcd, dlp or lcos. Now, we'll look at the comparison of these technologies when they're on tv。
And, of course, it's so much of a projective television that it's very advanced technology. Before a projection can be made, you must have a projector in your home to achieve the luxurious effect of viewing the big screen, which is of varying size, from 100 to 200 inches. When we switch images, we can also do it with the mouse, without even getting up. However, you can put up screens whenever you want to, without taking any space in your home。
