If your impression of the projector is still in the "slide projector" of the 1960s and 1970s, when the class, family and friends get together to watch the slideshow, then you are out!
Today, slide projectors have gradually been eliminated from the market and replaced by "projectors." It is widely used in home, education, smart office, entertainment venues, large projects and other fields. According to different working methods, it is mainly divided into different types such as LCD and DLP. This is why you will see different types of projectors in the current market. The price ranges from several hundred to several thousand to ten hundred thousand yuan. 100,000.
What is an LCD?
LCD is the abbreviation of Liquid Crystal Display. As the name implies, it is a liquid crystal projector. It is a red, green and blue liquid crystal panel that is transmitted through a lens and a Mirror. The light source in the liquid crystal projector is a metal halide lamp or a UHP (cold light source).
Why is the price of LCD projectors relatively low?
The metal halide lamp is a tungsten filament in the quartz bulb of the bulb, which is flushed with argon and added with a small amount of halogen gas. The technology is simple, so the price is low, and the disadvantage is that the half life is high, that is, the life is short, and the volume is large. , generally less than 1000 hours of brightness will be reduced to half of the original. When using a metal halide lamp projector, when the light is on, the voltage across the bulb is about 60-80V, the gas pressure in the bulb is greater than 10kg/cm, and the temperature is thousands of degrees, and the filament is in a semi-molten state. Therefore, it is strictly forbidden to vibrate when the power is turned on, and the projector is moved to prevent the bulb from bursting. After the use is stopped, the power cannot be disconnected immediately. The machine should be automatically stopped after the heat is dissipated. The damage caused by the power failure of the machine is the most common projector. One of the reasons for the repair.
Most UHPs are filled with high-pressure mercury and have low power consumption. They are called cold light sources. The bulb is moderately priced, with a normal service life of more than 4,000 hours, the longest even nominally 12,000 hours, and a small attenuation of brightness, making it an ideal cold light source for LCDs.
LCD projector advantages
Cheap price, good color reproduction (because it is projected by means of light), uniform brightness, general resolution up to XGA/WXGA/1080P standard, small size, light weight, easy to carry, is the projector market Mainstream products are also gradually becoming popular in home entertainment and small shopping malls at lower prices.
LCD projector shortcomings
The bulb of an LCD projector is generally maintained at about 60% of the original brightness after 1,500 hours of use, and after only 3,000 hours, there is basically only 40% of the brightness left, and the projector with a brightness of 3,000 lumens, After two years, there are only 1,200 lumens left. If you use the average of 4 hours per day, the bulb of the LCD bulb projector will usually change in about 2 years. As the only consumable of the bulb projector, the unit price of the bulb is generally about 1000~3000 yuan. Moreover, different brands and different types of projectors, bulbs are not interchangeable.
Japanese projectors always have an absolute advantage in the market. Although the brand has a good reputation, it is mainly based on liquid crystal panels. It is not a sealed engine. It is easy to enter dust, and the brightness is attenuated quickly. The initial use effect is very good, but unfortunately sustainable. Poor, the performance of the exhibition and the theme park industry is slightly eclipsed.
What is DLP?
DLP is the abbreviation of “Digital Light Processingâ€, which means digital light processing, that is, the image signal is digitally processed first, and then the light is projected. The principle is to pass the cold light source emitted by the UHP bulb through the condensing lens, homogenize the light through the Rod (light rod), and the processed light passes through a Color Wheel to separate the light into RGB three colors (or RGBW). Wait for more colors), then cast the color on the DMD chip from the lens, and finally reflect the image on the projection screen through the projection lens.
Principle analysis of DLP
The light source is refracted on the DMD chip after passing through the color wheel, and the DMD chip emits light onto the projection screen after receiving the control signal from the control board. The DMD chip looks like a small mirror that is enclosed in a confined space of metal and glass. In fact, this mirror is made up of hundreds of thousands or even millions of micromirrors. Taking a DMD chip with a resolution of XGA (1024×768) as an example, there are 1024×768=786432 micromirror units in an area of ​​1 cm wide and 1.4 cm long, and each micromirror represents one pixel, and the image is composed of these pixels. Composition.
Advantages of DLP projectors:
1. From a technical point of view, DLP projectors mainly have three characteristics: high native contrast, small machine size, and closed optical path;
2. The DMD chip adopts a mechanical working mode, and the movement of the lens is more controllable, and the high contrast of the original is expected;
3. The DLP projector adopts the principle of reflection, which is more thoughtful for eye protection;
4, DMD chip is a semiconductor structure, the lens is not easy to change too much at high temperatures, so the DLP projector uses a closed optical path, reducing the probability of dust entering;
DLP projector disadvantages:
Because the reflective structure adopted by the DLP projection system, especially in the middle and low-end products, it is slightly inferior to the LCD in the reduction of image color, and the color is not vivid enough.
Laser projector
How can we take the essence and take the dross? The emergence of DLP technology laser projector came into being, which not only perfectly inherits the advantages of both, but also makes up for the defects of both.
DLP laser projector is a laser light source projector using DLP technology. The laser light source has a lifetime of 20,000 hours, at least 10 times the life of the bulb. If the bulb is replaced by a laser, there is no expensive cost for subsequent replacement of the bulb; The projector adopts a fully sealed engine, which plays a very good role in protecting the chip. It is a very good choice for long-time projection, such as theme parks, exhibitions and other scenes, without worrying about color attenuation.
Laser source advantages:
1. Low energy consumption, the energy consumption of laser light source is only 50% of traditional high pressure mercury lamp;
2, low heat, cold light source has lower requirements for heat dissipation, so the projector can be quieter;
3, small size, the volume of the solid-state light source illuminator is less than one tenth of the traditional light bulb;
4, long life, 20,000 hours of life, the projector is broken, the light source may not be broken;
5, the color is pure, RBG three primary colors are directly mixed, the image is more beautiful;
6, flashing, switch at any time, no need to wait, there is no risk of flashing.
Emerging brands
At present, from the classification of brands, high-end laser engineering machines are mainly Japanese, European and American brands, while domestic and Taiwanese brands focus on education and households. At present, there are more outstanding domestic brands that are quietly rising.
Take DET as an example. Det Dehao, a leading domestic video display system solution provider with 18 years of careful brewing, established its own laser projector brand, DET Dade Information, which was mainly developed and sold. Laser projector and other directions. DET laser product line completes from laser phosphor powder to tri-color pure laser, single-chip DLP laser projector to 3 DLP laser projectors, from 2800 lumens to 30,000 lumens, from laser home theater, short-focus commercial laser projection, high education Projection, to laser engineering projection, to meet the needs of various fields.
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