Television is now becoming an indispensable part of every family. With the advancement of technology, the types of TVs are increasing, and rear-projection TV is one of them. So what is a rear projection TV? What is the principle of rear projection TV? The following decoration home decoration network Xiaobian will give you an answer one by one for your reference.
What is a rear projection TV?
Rear projection TV is the TV behind projection. It is a TV imaging system that combines the screen and projection system with the principle of projection and reflection. The full name of the rear projection display system is also called "Rear Projection Display System". In fact, rear projection is also a way of projection display. Due to the integration of the projector and the screen, the user of the rear projection TV does not need to optically adjust the system, making it more convenient to use than the front projector.
What is the principle of rear projection TV?
1, imaging principle: different imaging principles ordinary rear projection TV and the TV, which is a combination of an ordinary color television projection technique based on the research and develop. From the working principle, the principle of the receiving part is basically the same as that of the ordinary color TV, and the biggest difference lies in the processing after receiving the television signal. After receiving the video signal, the ordinary color TV directly displays to the screen through the picture tube, and after the back projection color TV receives the signal, it is processed by the circuit, and then optimized by the convergence circuit and the digital filter circuit, and transmitted to the red, green, and side by side. Blue three monochrome projection tubes. The television images produced by the three projection tubes are respectively magnified by a lens and reflected by the mirror onto the projection screen to be combined into a complete large-screen color image.
2. Reflection technology: The projection image of the projector has to be reflected several times to be projected onto the screen, so the rear projection has high requirements for the mirror. The first is that it cannot be deformed, and the second is that the reflectivity is high. In terms of reflectivity, it is different from the ordinary optical glass reflection method, and the rear projection type is a front reflection method with a high reflectance.
3 , screen classification: At this stage, the big screen rear projection TV can roughly include three types, plasma TV, LCD rear projection TV and DLP rear projection TV. They all have very high definition, especially for plasma TVs and LCD rear projection TVs. However, although the first two products have obvious advantages, they are all subject to cost and manufacturing constraints. The price is very expensive and can be borne by ordinary consumers. DLP rear-projection TVs have obvious advantages over traditional CRT TVs, and are much cheaper in price than the other two products. So for most home users, DLP rear projection TV is the right choice.
Why is rear projection TV eliminated?
1. The picture is vague and unclear: some people once thought that its price was high. But this reason is already untenable, because with the drastic cut in the price of rear projection TV, its sales are still slow to go up. “Looking too vagueâ€, this is a lot of consumers’ evaluation of rear-projection TV. Due to the narrow viewing angle, some TVs are even blurred from the side, which is far from the development of traditional TVs that have been skilled for decades.
2, high cost of use: rear projection TV brightness is uneven, need to change the bulb regularly, the price of a general bulb is about 1000 yuan, which is quite different from the traditional TV one-time investment.
3, fierce price war: LCD TV prices are getting lower and lower, and its resolution and display technology is also constantly improving. The emergence of a large number of flat-panel TV products has made the competition faced by rear-projection TVs more and more fierce, and it is increasingly difficult to maintain profitability, so that major manufacturers can not maintain the normal operation of the rear-projection TV business.
4. Technical barriers: Compared with traditional TVs, rear-projection TVs are larger in size and smaller in radiation. They have become synonymous with high-end products for a period of time, but these technologies were only in the hands of a few European and Japanese companies. Forcing other TV manufacturers to invest only in mature plasma and LCD TVs, which has led to the backward development of backlight TV technology, which has been surpassed by plasma and LCD TVs.
The above is what Xiaobian brought to you. What is a rear projection TV? What is the principle of rear projection TV? I believe that everyone has a basic understanding of what is a rear projection TV after reading this article. If you want to know more about decoration, please click on the decoration knowledge channel .
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