購買液晶顯示器必須謹(jǐn)防的七大陷阱（The seven traps that must be taken care of when buying LCDs）

1、購買液晶顯示器必須謹(jǐn)防的七大陷阱（The seven traps that must be taken care of when buying LCDs）The seven traps that must be taken care of when buying LCDsAny 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

2、 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 cornersA liquid crystal displa

3、y 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, b

4、ut 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

5、 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 n

6、eed 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

7、 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 t

8、o 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 LC

9、D 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 ma

10、nufacturers 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

11、 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

12、 are good, and the rate of rework will not be high.Hidden tricky in LCD product packagingDo 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 v

13、ery important, the cost is not low. If you dont see the discarded boxes, you can sell a few cents a kilo. A lot of people are scrambling for it, arent 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

14、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

15、, 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 packagi

16、ng, 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. Rec

17、ycled 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 functionFamiliar friends all know, the current field of liquid crystal display has an unwritten rule, a liq

18、uid 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

19、 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 s

20、imply 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 fun

21、ction is of little significance for you, then choose shrink products is certainly more sensible.LCD products such as accessories can not be lessThe attachment is another very straightforward LCD display link. The usual LCD displays include cables, discs, instructions, and other mounting attachments.

22、 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 t

23、he 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,

24、 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

25、 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 d

26、ifference 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 Chinas CCC, the line is through multinational certifica

27、tion, 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

28、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 thei

29、r 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 buildingThe big

30、gest 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 h

31、as 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, simp

32、lify 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 gradua

33、l 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 h

34、ousings, 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 protec

35、tion, 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 spe

36、nding 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 ma

37、intain 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 gr

38、eatly affected, will be very rough.TCO, RoHS certification BasicsIn 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 t

39、o 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 the

40、se certification is not free, in accordance with the certification bodies, fees are different, it costs a lot.At present, Chinas 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 cer

41、tifications include the CE European common market security mark, Japans 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

42、the countrys 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 relat

43、ively 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 eco

44、logy, 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 specificat

45、ion 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 worlds most stringent environmental d

46、irectives. 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 dipheny

47、l ether (PBDE two) and polybrominated biphenyls (PBB) and other harmful substances. Of course, RoHSs 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

48、 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

49、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 clear

50、ly 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 productsIn 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 e