购买液晶显示器必须谨防的七大陷阱(The seven traps that must be taken care of when buying LCDs)

taken care of when buying LCDs）

The seven traps that must be taken care of when buying LCDs

Any product price depends largely on the cost, reduce the cost is the most effective way to improve profits, so all kinds of products are easy to cut corners on the cost of links, the liquid crystal display is no exception. Seemingly similar products, different manufacturers, different models, there are hundreds or even more than 1000 yuan gap, the reason is that there is a difference in cost.

The panel level is the easiest to cut corners

A liquid crystal display seventy percent of the cost from the liquid crystal panel, a liquid crystal panel is a core component of liquid crystal display well, of course it is most likely to cut corners of parts.

First of all, there are differences in performance of LCD panels, the performance of a more general LCD panel, but also a high angle of view, high contrast panel. Performance effect of liquid crystal display or not, basically by the choice of what the panel decided, bad JS is likely to be some shoddy, low performance products for superior performance products and Huyou expensive for such products only need to carefully check the information, the real performance can clear the product easy to distinguish.

In addition, the liquid crystal panel the same performance when

the sale of the factory was set at different levels, and different levels of panel prices are different, in order to reduce the cost only need to order a low level panel on the line. From the panel appearance is difficult to distinguish between the grade of the panel, so after all the panel assembled into a product from the sale is difficult to see the difference.

To distinguish the grade of the panel, mainly to see the number of pixels of the panel, the less the number of pixels, and promised no highlights panel level is higher. The high level panel itself is light small, no other problems such as spots, color. The lower level of the panel have more or less problems, such as bad or more, there are stains, light is hard. That is to say, this is when the actual business classification panel factory by choosing to distinguish, good product quality, high grade, higher prices, or low goods or defective products, the price is certainly low. This classification standard is widely used in IT product parts.

In fact, there are many LCD display giants are not specially customized proprietary LCD panels, but also with other two or three wire manufacturers in the same panel manufacturers procurement. But this kind of companies often pay much attention to the selection panel, is often selected a small part in a batch of LCD panel manufacturers in this part of the boutique course quality is higher than other products, high cost, the price of more expensive and very easy to understand.

In fact, for their own use panel manufacturers quality often have a mental picture, agent told dealers to sell under the condition that a batch of products, because the panel quality

is poor, prone to bad dark spots and other issues. Of course, the faster you sell, the better. If the panel quality is good, manufacturers may also temporarily implement insurance policy on a batch of products, because manufacturers understand that these products are good, and the rate of rework will not be high.

Hidden tricky in LCD product packaging

Do not think that the product packaging is a box so simple, the product packaging involves many issues such as safety, environmental protection, in the mass production of industrial products, packaging is also very important, the cost is not low. If you don't see the discarded boxes, you can sell a few cents a kilo. A lot of people are scrambling for it, aren't they?

Liquid crystal display good packaging is usually thick, in order to ensure the handling time will not be damaged, the raw materials are usually recyclable, environmentally friendly material, can find the logo on the packaging material circulation in general. In the packaging printing, pay more attention to the manufacturers usually printed on the built-in display appearance, but also as far as possible to provide information such as display, such as the type, size, weight, the approximate performance, the printed text is also a cost of printing less cost lower. More attention will also be paid to the beauty of the outer packing,

The printed content can even include pictures and other information, very delicate. And in the outer packaging, Jerry manufacturers generally try to simplify these things, an outer package can be used for more than the specifications of similar

products.

In addition to the packaging itself, the internal filling material can not be ignored. The most common materials are recycled paper and foam plastics. Recycled paper is more expensive, and is usually seen on high-end displays. The foam is very popular. Because it is a by-product of petroleum, the price is very cheap.

LCD products can also shrink function

Familiar friends all know, the current field of liquid crystal display has an unwritten rule, a liquid crystal display usually launched with DVI interface and DVI interface with two models, and other specifications are almost exactly the same, of course, the price is also different. This is the most direct example of simplifying functionality and reducing costs. Of course, there are other ways to omit built-in speakers, microphones, USB interfaces, and so on.

This functional simplification can effectively reduce costs without reducing most of the performance of the LCD display. \"Shrink\" version of the product will not be designed, using the \"original\" products of the scheme can be produced, is simply a rich product line, the clan of the two products can meet the needs of more people, in line with market rules.

In fact, this \"Jerry\" can be regarded as a normal means, is not necessary as an abhorrence of the phenomenon, we cite the case is not to everyone choose functional products, if this function is of little significance for you, then choose \"shrink\"

products is certainly more sensible.

LCD products such as accessories can not be less

The attachment is another very straightforward LCD display link. The usual LCD displays include cables, discs, instructions, and other mounting attachments. Any deductions or reductions in quality can reduce costs.

The most common example is the double interface display should equipped with DVI and VGA two cable chisel DVI line, can save part of the cost, dual interface display is more high-end products, two lines are basically there will be now, with the popularity of DVI, many entry-level display also has this interface, but the DVI line is usually omitted.

In addition to simply do not give, the quality of cable is also very common. First, say the VGA signal line, which is easiest to see. OK, VGA line diameter is coarse, and flexible and elastic, and the joint part is exquisite, without burr. The poor quality VGA wire is not only very thin, but the wire is very crisp and the quality of the joint is not good. At present, many low display VGA lines have shrunk seriously, many brands attached to the VGA line is actually only a little bit thick than the keyboard line. All this comes with a VGA line machine, a grade not high. The DVI line is roughly the same as the VGA line.

In addition to the signal line, the power line also shows the problem. Good lines of flexible material, and the length is generally 1 meters, 5 to 2 meters or so, the difference in the

length of the line has shrunk, the corresponding material requirements are reduced. Then, you can see through the signal line interface authentication said good sign line has a lot of, what the EU, Japan, the United States, and China's CCC, the line is through multinational certification, quality guaranteed. Poor line certification is rare, and some are not available at all. If the monitor comes with speakers, what should also pay attention to cable, good audio lines have degaussing ring, high cost. Of course, of course not. However, the audio lines attached to the monitor are all the same, and it is rare to see cables with degaussing loops.

Transformer is also part of the important accessories display, good quality and quality in general, the middle of great flexibility. However, at present, many display manufacturers prefer to use built-in power, so that the cost of their own master, or control.

In addition to the cable can make a big article, save the drive CD-ROM, instructions are the same. Although the cost of these parts is not high,

But in the mass production of industrial products, the amount accumulated is not small.

Product shell prone to Jerry building

The biggest cost outside the LCD panel is the shell, which is the most important part of the display manufacturers. LCD manufacturers have a special design and R & D team for the shape of the products, and the current LCD can easily distinguish the

manufacturers from the design. The large brand LCD often has unique design in appearance and shape, but the small factories with insufficient strength often adopt simple shape design, or imitate other excellent products. Since there is so much knowledge on the shell, so much effort has been put into it, of course, it is very easy to cut corners.

First, simplify the design as much as possible. For example: plastic shell display commonly used are smooth and pitted, which pitted the surface than expensive, if the housing is designed into a light, the cost is naturally designed than cheap noodles. In addition, in the shape design can also adopt the gradual method, only on the original basis to do some minor adjustment, so that you can use as much spare parts as possible, so that the cost savings.

Secondly, it can reduce the material of the shell. The most common material for liquid crystal displays is plastic, and a small number of high-grade metal housings, such as AOC and 174F, are integral steel shells, and Samsung 193P+ even uses aluminum magnesium alloy housings. Cast aside the metal shell, not to say, plastic shell is also a variety of, of which the most important is the material is different, good plastic material is environmental protection, fire, and some less is not so good. In general, the quality of good display, fire plastic shell, at least the cost of 200 yuan or so, if the unique shape, but also more expensive. As far as metal is concerned, let alone.

Finally, work hard on the mold. Many people may not know, in fact, die spending is one of the highest cost of project display manufacturing and R & D cost is very simple! Even if the

appearance of the display, the light mold cost will be about 1000000! And die cannot old, midway requires a lot of maintenance in order to maintain the quality of housing, even if it is to maintain the good die there life, wear to a certain extent is useless, must spend a lot of money to do the new. If the manufacturers want to reduce housing costs, the mold can continue to use at end-of-life degree under the condition, this can save a lot of mold cost, but the shell accuracy will be greatly affected, will be very rough.

TCO, RoHS certification Basics

In order to ensure safety, environmental protection and other factors, some industrialized products have certain standards to be implemented, that is, we usually say certification, only in compliance with these certification in order to allow users to ease their use. Certification of this item in general goods can not see, can not touch, and when more certified products must have more advantages. And this is just one icon on the monitor, similar to the invisible cost, also need manufacturers pay a great deal of price. Through these certification is not free, in accordance with the certification bodies, fees are different, it costs a lot.

At present, China's implementation of CCC mandatory security certification of display products, as long as it is not inferior products will pass this certification. The rest of the common certifications include the CE European common market security mark, Japan's JIS logo, the British BEAB logo, the US UL logo, the French NF logo, and the German CS logo. If the display in the domestic sales, it only needs to pass CCC, and if sold in

the countries mentioned above, it is necessary to pass the country's certification, obtain certification.

In addition to the safety certification that electronic products must carry out, there are some professional certifications, such as MPR, II, TCO, and the current popular RoHS.

Among them, MPR II is about the monitor radiation certification, is a relatively basic standard, almost all monitors can meet this standard. TCO is the certification of environmental protection, and RoHS is the certification of lead-free process production.

TCO certification is a Swedish Labor Union developed a series of strict and standard for display products, only in ecology, energy, radiation, human engineering and electrical safety five aspects are in line with the TCO Development standards, can through the TCO version certification. TCO is currently recognized as the most stringent authentication system in the field of display, and the display of this specification can provide maximum protection for users. Currently, TCO has released the 06 standard.

RoHS (Restriction, of, Hazardous, Substances, hazardous substances restrictions) is an official certification of the European Union (Figure 1), known by the industry as the world's most stringent environmental directives. According to the relevant provisions of RoHS certification standards, since July 1, 2006, all sold in the EU market of electrical and electronic equipment must prohibit the use of lead (Pb),

mercury (Hg), cadmium (Cd), six chromium (Cr6+) and other heavy metals, and polybrominated diphenyl ether (PBDE two) and polybrominated biphenyls (PBB) and other harmful substances. Of course, RoHS's influence is not limited to Europe. It is becoming a global standard. The relevant laws and regulations of our country have already entered the \"bulletin\" stage, and we believe it will be published and implemented soon.

To pass these certification is not easy, first of all, the product should be strict security certification, design requirements, all aspects can not be careless, so as to increase the production cost of the product. According to statistics, a monitor through certification requires about 200 thousand of the cost, although there are domestic commissioning units, but the licensing rights in foreign countries. The average display takes about 2 months, so the cost of a small certification is never low. These long-term environmental protection and lead-free considerations, is clearly not in line with the idea of JS, so many small plants in addition to electrical safety certification necessary, of course, all the other certification.

Other cost control for LCD products

In addition to the aforementioned aspects, there are also parts of the LCD that can be \"cost control\including control modules and power modules.

Position control module in liquid crystal display is equivalent to the personal computer motherboard, display control function of it all, and the power supply module is for power management,

they are in the form of integrated circuit board integrated in liquid crystal display device, and integrated circuit board in the \"cost savings\" place very much. From PCB to all kinds of electronic components selection, can be very different. For example, PCB version, the cheapest single board, there are more expensive multi-storey board, good board, high security, integration is good, but the price is not cheap. Even components of the same specifications on an integrated circuit board may differ in quality, such as fire resistance and durability, and will lead to the final cost difference.

In addition, the function of the control panel also plays a decisive role in the cost. For example, to realize the gray scale response time, we must join the corresponding chip, and the design of the board should also be taken into consideration. More functions of the board, less expensive than the function of a lot of money. At present, a simple control board will cost nearly 300 yuan, not to mention more functions. epilogue

After watching this, I believe you not only for the production of the LCD and part of a certain understanding, choice of technology, complete materials carefully consideration while products will increase the cost, but you use the product safety and comfort can get the best guarantee. More importantly, you should know how to distinguish between the advantages and disadvantages of LCD monitors, and then face the JS Huyou, you will not easily caught. Last

Don't easily believe all kinds of propaganda on the internet.