Dramaqueen
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Rear Projector is relative to the front projector . The common multimedia projectors on the market that people often refer to are orthographic projectors. In principle, rear projection and front projection are the same.
The meaning of Rear Projector:
Simply put, the front projection is that the observer and the projector are located on the same side of the reflective screen. The light projected from the projector illuminates the screen, and the observer sees the light reflected by the screen; the rear projection is The observer and the projector are located on both sides of the rear projection screen. Install the projector at the bottom of the fuselage. When the light projected from the projector illuminates the translucent rear projection screen, part of the light will pass through. It is the transmitted light.
For users who use rear projector, because the projector and the screen are integrated, they do not need to make optical adjustments to the system, and it is as simple as using an ordinary TV. Since the rear projector uses in the cabinet, the image projected on the screen will not be affected by the ambient light, so the image can be displayed intact in a brighter environment. There is a large space in the rear projection cabinet, which can easily access the TV signal and install high-quality audio. The rear projection TV is the product of this principle. Rear projection TVs can be divided into CRT (cathode ray tube), LCD (liquid crystal), DLP (digital light processor), LCOS (reflective liquid crystal) and other types according to the type of projectors they use.
1.CRT rear projector
CRT rear projection has the advantages of high brightness and long continuous use time. Because the CRT technology is very mature, the production scale is large, and the cost performance is high, it is in a dominant position in the current rear projection market. The disadvantage of CRT rear projection is that it is difficult to increase the brightness, because it relies on phosphors to emit light, and it is easy to age the kinescope. After a long time, the picture will become darker and the definition will be reduced.
2. LCD rear projector
LCD rear projection utilizes a very mature liquid crystal projection technology, which has good color reproduction, brightness and contrast are superior to CRT rear projector. Since LCD rear projection relies on the light bulb to emit light, it is easy to increase the brightness. As long as the power of the light lamp is increased, as the technology continues to improve, the life of the light bulb has been greatly improved, which is close to the life of ordinary TV sets. The main reason why LCD rear projection has not become the mainstream of the rear projection market is the high cost. In addition, compared with CRT rear projection, although the display effect is good, it is limited to the reason of its working principle, and it cannot be opened like CRT rear projection. With the shutdown, it takes time to warm up after power on and heat dissipation after power off.
3.DLP rear projector
DLP rear projection has high brightness, long continuous use time and complete functions. Due to the use of digital processing technology, it has great advantages in the reproduction of digital signals. DLP technology can be easier to achieve miniaturization than CRT and LCD, and the cost is lower, the development prospects are optimistic about the industry. Previously, American Luxeon Technology launched a 42 / 52-inch DLP ultra-bright rear projection TV, and its clear and bright image performance was praised by the industry.
4. LCOS rear projector
LCOS rear projection has the advantages of high brightness, high resolution and low power consumption. At present, products based on LCOS technology have not yet been mass-produced, and only a few manufacturers (such as LG and Skyworth) have launched several products. Because the mass production of LCOS display chips has the potential to greatly reduce costs, people in the industry are optimistic as a popular product technology. As the technology matures, once mass production is achieved, there will be very good market prospects.
Summary
At present, foreign brands of rear-projection TV products on the market include Hitachi, Toshiba, Panasonic, etc., and domestic brands are mainly Changhong, TCL, and Skyworth. Last year, the production of domestically produced rear projection TVs was 200,000 units, and this year it will reach 300,000 to 400,000 units. Rear projection TVs are becoming more and more popular and are being used more and more widely.
The meaning of Rear Projector:
Simply put, the front projection is that the observer and the projector are located on the same side of the reflective screen. The light projected from the projector illuminates the screen, and the observer sees the light reflected by the screen; the rear projection is The observer and the projector are located on both sides of the rear projection screen. Install the projector at the bottom of the fuselage. When the light projected from the projector illuminates the translucent rear projection screen, part of the light will pass through. It is the transmitted light.
For users who use rear projector, because the projector and the screen are integrated, they do not need to make optical adjustments to the system, and it is as simple as using an ordinary TV. Since the rear projector uses in the cabinet, the image projected on the screen will not be affected by the ambient light, so the image can be displayed intact in a brighter environment. There is a large space in the rear projection cabinet, which can easily access the TV signal and install high-quality audio. The rear projection TV is the product of this principle. Rear projection TVs can be divided into CRT (cathode ray tube), LCD (liquid crystal), DLP (digital light processor), LCOS (reflective liquid crystal) and other types according to the type of projectors they use.
1.CRT rear projector
CRT rear projection has the advantages of high brightness and long continuous use time. Because the CRT technology is very mature, the production scale is large, and the cost performance is high, it is in a dominant position in the current rear projection market. The disadvantage of CRT rear projection is that it is difficult to increase the brightness, because it relies on phosphors to emit light, and it is easy to age the kinescope. After a long time, the picture will become darker and the definition will be reduced.
2. LCD rear projector
LCD rear projection utilizes a very mature liquid crystal projection technology, which has good color reproduction, brightness and contrast are superior to CRT rear projector. Since LCD rear projection relies on the light bulb to emit light, it is easy to increase the brightness. As long as the power of the light lamp is increased, as the technology continues to improve, the life of the light bulb has been greatly improved, which is close to the life of ordinary TV sets. The main reason why LCD rear projection has not become the mainstream of the rear projection market is the high cost. In addition, compared with CRT rear projection, although the display effect is good, it is limited to the reason of its working principle, and it cannot be opened like CRT rear projection. With the shutdown, it takes time to warm up after power on and heat dissipation after power off.
3.DLP rear projector
DLP rear projection has high brightness, long continuous use time and complete functions. Due to the use of digital processing technology, it has great advantages in the reproduction of digital signals. DLP technology can be easier to achieve miniaturization than CRT and LCD, and the cost is lower, the development prospects are optimistic about the industry. Previously, American Luxeon Technology launched a 42 / 52-inch DLP ultra-bright rear projection TV, and its clear and bright image performance was praised by the industry.
4. LCOS rear projector
LCOS rear projection has the advantages of high brightness, high resolution and low power consumption. At present, products based on LCOS technology have not yet been mass-produced, and only a few manufacturers (such as LG and Skyworth) have launched several products. Because the mass production of LCOS display chips has the potential to greatly reduce costs, people in the industry are optimistic as a popular product technology. As the technology matures, once mass production is achieved, there will be very good market prospects.
Summary
At present, foreign brands of rear-projection TV products on the market include Hitachi, Toshiba, Panasonic, etc., and domestic brands are mainly Changhong, TCL, and Skyworth. Last year, the production of domestically produced rear projection TVs was 200,000 units, and this year it will reach 300,000 to 400,000 units. Rear projection TVs are becoming more and more popular and are being used more and more widely.
