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What is the projection ratio? What is the projection ratio of the projector?
The projection ratio in the definition of the formula refers to the ratio of the projection distance to the width of the screen. It needs to be explained here that we usually call the length of the projection screen the width and the width as the height, so don't get it wrong. Actually, projection is not just a simple definition. It can reflect the changes in projection technology over the years. From the earliest telephoto projectors to today’s short-throw projectors, the projection ratio is getting more and more. Small, which allows the projector to have a wider range of applications, to put it simply, short distance and large screen.
So what is the general value of the projector's throwing ratio? The throw ratio of ordinary projectors is usually between 1.5 and 1.9. When the throw ratio is less than 1, we usually call it a short throw lens, and when the throw ratio is less than 0.6, we usually call it an ultra-short-throw lens. In addition, the throw ratio can also be a range, because some projectors support zoom, that is, have different effects at the same distance, and users can adjust it according to their needs.
So when we usually encounter ordinary, short-throw, and ultra-short-throw projectors, how far is the projection distance required in general when the projected screen size is fixed? Take our common projector with a 16:9 projection image. It is necessary to project a 100-size image. When the projection ratio is 1.5, the projection distance of the projector is about 3.3 meters; when the projection ratio is 1, the projection distance of the projector is about 2.2 meters; when the projection ratio is 0.4, this is what we usually call a reflective ultra-short-throw laser projector. The projection distance of the 100-inch screen is generally about 0.4 meters.
The original projector requires a distance of two or three meters to project a picture above 100 inches, which makes most projectors choose the ceiling installation method, which is acceptable for education and other fields because the wiring and wiring of the projector have been installed in advance. Design arrangements have been made for installation. However, for some users who have not reserved a projected location, it is troublesome, and wiring everywhere will also affect the aesthetics of the room.
The reduction of the projection ratio value brings great convenience to our lives
Now with the development of science and technology and the changes in people's needs, the projection ratio of projectors is constantly getting smaller, and ultra-short-throw projectors that can project large images at short distances have become a trend. At present, laser ultra-short-throw projectors are more and more used in education, home use, and other fields. The main reason is that ultra-short-throw projectors greatly shorten the projection distance, eliminating the worry of many users who want to use the projector but suffer from the small indoor space. In addition, the reduction of the projection ratio has many advantages, for example, the light will not illuminate the speaker in front of the screen, which will affect the speaker's speech and audience viewing.
The application of ultra-short-throw projectors in-home laser TVs will also stimulate the reduction of the throw ratio
Will the projection ratio of the projector continue to decrease? The author thinks that laser TVs are still heating up, and everyone knows that laser TVs use reflective ultra-short-throw projectors. The fierce competition in the laser TV industry is bound to promote technological change, and it is quite possible that the projected ratio will continue to decrease. When everyone pays attention to projector prices and other aspects, they also need to pay more attention to some changes in the projector's projection ratio. The throw ratio has a great influence on the daily application of the projector.