Dust, the first killer of projector life
As the low-end projectors continue to evolve, prices have plunged like competitions, and more and more companies and families are considering buying projectors. For the company, the large screen display can play a big role in many aspects such as conferences and presentations. For home users, low-cost projectors bring affordable big-screen enjoyment. All these changes are derived from "cost."
Although the price of high-end projectors is still unsatisfactory, more and more low-end projectors hit the market, and the cost of purchasing projectors has been greatly reduced. From the past 10,000 yuan price, only enterprises and institutions, audio and video enthusiasts dare to buy. Up to now, the minimum screen price is only 3,000 yuan, and the cost difference is self-evident. However, friends familiar with the projection industry know that buying projectors only saves upfront costs, and post-maintenance costs are equally important. However, many users who are eager to purchase projectors often overlook the late cost of the projector.
The so-called post-cost is the cost of purchasing and using the projector, the biggest cost of which comes from the bulb. When the light bulb is illuminated, it will also generate a lot of heat. On the one hand, the bulb should be well cooled, and on the other hand, the life of the bulb is also the focus of attention. Of course, the problem of self-heating is inevitable. The real image to the later cost is often the most inconspicuous and most common dust in our lives. As we all know, dust is harmful to electronic components. A large amount of dust gathers not only heat and loss of image, but also causes problems such as static electricity and short circuit, which directly threaten the "health" of electronic equipment. If you compare the projector to a person, the disease can damage the human body and shorten the life of human beings. The interference of dust on the projector is like a chronic disease that threatens life. The faster the dust accumulates, the larger the image of life.
At present, the life of the projector bulb is generally between 2000 and 4000 hours (normal mode), but if the dust image is relatively large, it is likely to be imaged to life. The lifetime of these images can be called the post-projector cost. How to effectively control the dustproof and heat dissipation of the projector naturally becomes the key to grasp the cost later. In other words, in order to make the projector dustproof and heat-dissipating, it is equivalent to let the projector live longer.
Dust as the projector's number one "enemy" has always been the difficulty that projector manufacturers are committed to overcome. Of course, after all, the projector is bought and used by consumers. Here, we will discuss the actual analysis of dust and heat dissipation for the majority of consumers, from the core of the projector, dustproof, and actual products of the bulb.
LCD projector principle, and dust prevention measures
Since it is a projector, it is impossible to mention the working principle of the projector. At present, the projector can be roughly divided into two camps, LCD and DLP, and the projection principle is also very different. Below, we will first look at the working principle of the LCD projector, as well as its common dust-proof measures.
Figure 1 LCD projector works
Typical three-chip LCD projector works
The three-panel LCD projector uses independent R, G, and B liquid crystal panels. The white light generated by the bulb is split and reflected by the optical path system to generate three red, green, and blue light beams, which respectively penetrate the corresponding liquid crystal panel, and the liquid crystal panel receives electrons. The control of the circuit determines the switching state of each pixel, and finally the color image is output by the color mixing matrix system and the lens. Since white light is decomposed into red, green and blue colors in all time periods, the light utilization efficiency and color depth are effectively improved.
　　 Figure 2 shows the working principle of a typical three-chip LCD projector
LCD projectors Because the liquid crystal panel needs to contact the air to cool the high temperature, an open optical system must be adopted. Therefore, it is necessary to add dustproof glass to the TFT (Thin Film Transistor) panel. Add dust-proof glass to the front and rear to prevent damage to the TFT panel and to absorb dust. Dust cannot be seen on the dust-proof glass sheet because the dust is out of focus when projected. Of course, after all, it is still exposed to the outside air and cannot block dust 100%. Usually LCD projectors will add a dust filter at the air inlet to minimize the ingress of dust. Especially for LCD projectors used in the education industry, the use of specially designed dust filters will of course add a part of the cost.
LCD projector: The dustproof effect is normal, and it must be equipped with a dust filter to achieve a good dustproof effect. Especially for the education industry.
Figure 3 DLP color wheel
Texas Instruments' DLP (Digital LightProcessor) digital light processor uses DMD digital micromirror device as a light valve imaging device, uses digital optical processing technology to modulate the video signal, drives the DMD optical path system, and acquires large-screen images through the projection lens. Each micromirror of the DMD board represents a basic pixel. For example, the SXGA+ resolution DMD board is distributed with at least 1400 & TImes; 1050 micromirrors. Since DLP uses reflected light imaging technology, there is no problem that the LCD projector aging due to the high temperature working environment, and the life of the typical use is significantly better than that of the LCD projector.
Figure 4 DLP projector internal structure
Better innate dust resistance
Millions of micromirrors used for imaging on DLP chips, because they are already packaged, do not touch dust, and most DLP projectors use closed optomechanical design, so the inherent dust resistance is better. .
DLP projector: DLP itself has better anti-dust ability, and the filter dust net is not high, and even the filter net can be used. Long-term use does not cause aging, but affects color.
Filter and bulb cleaning
Despite various dust-proof measures, dust is inevitably entered in areas with high dust. For example, in an educational environment, the use of chalk in the classroom can produce a lot of dust. Or the entertainment environment of the disco, there are many dusts. There are also some dry areas in the north, especially in the northwest, where sandstorms are coming, which greatly tests the dust filter effect of the projector.
In addition, relying solely on the filter screen does not work. The filter can effectively filter the dust, but the dust accumulates too much for a long time. Once the image air enters normally, the image dissipates heat. Secondly, it can't block the dust 100%, but it will inevitably fall. Therefore, cleaning the projector's strainer and light bulb becomes a daily homework.
Filter and bulb cleaning
Despite various dust-proof measures, dust is inevitably entered in areas with high dust. For example, in an educational environment, the use of chalk in the classroom can produce a lot of dust. Or the entertainment environment of the disco, there are many dusts. There are also some dry areas in the north, especially in the northwest, where sandstorms are coming, which greatly tests the dust filter effect of the projector.
In addition, relying solely on the filter screen does not work. The filter can effectively filter the dust, but the dust accumulates too much for a long time. Once the image air enters normally, the image dissipates heat. Secondly, it can't block the dust 100%, but it will inevitably fall. Therefore, cleaning the projector's strainer and light bulb becomes a daily homework.
Cleaning the net
For LCD projectors, dust filters are especially critical. The projectors used in the education industry are often equipped with such a dusty filter.
Cleaning the net and cleaning the bulb
For DLP projectors, the dust filter requirements are not critical. Even without the filter net, it can achieve good heat dissipation, because the DLP itself is a closed light path, and the dust image is small. Equipped with this quick-disassembling filter dust net, it is easy to clean and maintain.
Vacuum cleaner to clean dust
Cleaning of the filter dust net: depending on the use environment, it can be as little as 3 months and more than half a year. It is best to clean it once. At least one or two filter nets are cleaned every year, and the environment is dusty, and the bulbs need to be cleaned of dust.
In fact, dust filter cleaning is also part of the later cost. If the projector dust filter has a simple disassembly design, it is much easier for cleaning. However, if there are a large number of projectors (such as school classrooms), it is necessary to clean up each projector once, and it takes a lot of time and labor. On the other hand, if the projector dust filter cannot be removed from the outside, it is very troublesome to clean up. Considering that most of the projectors are hung on the roof, first climb the ladder and climb down, then take the professional maintenance department to disassemble and clean. The cost is huge, I don’t think it’s necessary to say that the netizens have already counted.
For the dusty environment such as the education industry and the bar disco, cleaning the filter screen regularly must become a daily homework. It is best to choose a projector that can easily remove the dust filter design. Don't be tempted to buy it for a while, and then clean up and maintain it later, you will know the trouble. For ordinary environments such as business and home use, it is basically enough to clean up one or two times a year. In contrast, LCD projectors require some work because the filter must be cleaned. The cleaning and maintenance cost of the DLP projector is less, because the dustproof effect is good, and it is good to take it with a vacuum cleaner.
The unique acicular radiator,360 degree dissipation small wind resistance. High heat dissipation efficiency ensuring that the LED chip can work for 50000 hours.
Color temperature 3000-6000K
Light≥90LM/W
Matching the 2.3.4 lane,tunnel and Landscape Lamp,floodlight dedicated lens.Ensure that intensity and uniformity.
Glare index Signification reduce the original LED Module size,removal of power supply problems.Low demands for application situation and installation personnel More suitable for the transformation of traditional lamps.
Technical parameters
Power :30W,30W,15W,15W
Structure size: 135×100×40 mm, 208×74×49 mm, 125×58×30mm, 380×40×25mm
Lens size: 135×100 mm, 186×64 mm, 125×58mm, 355×40mm
Input voltage: 220 V, 220 V ,220 V, 220 V
Input current: 0.132 A, 0.132 A ,0.123 A, 0.125 A
Luminous flux: 2760 LM ,2400 LM ,1230 LM ,1300 LM
Light effect: 92 LM/W 80 LM/W 82 LM/W 86 LM/W
Color temperature: 5000 K 5000 K 5000 K 5000 K
Power factor: 0.99 PF 0.98 PF 0.98 PF 0.99 PF
Working temperature: -40+50°C, -40+50°C, -40+50°C ,-40+50°C
Led Module,Led Modules For Signs,Led Module Bulb,Led Modules For Signage
Jiangsu chengxu Electric Group Co., Ltd , https://www.satislighting.com