购买液晶显示器必须谨防的七大陷阱

1、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 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 cost of links, the liquid crystal display is no exception. S

2、eemingly 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 display seventy percent of the cost from the liquid crystal panel,

3、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. Performanc

4、e 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 cl

5、ear 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 ap

6、pearance 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

7、 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

8、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

9、 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 hi

10、gher 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 da

11、rk 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 tri

12、cky in LCD product packagingNever think that the outer packing of a product is a box. Its so simple,The outer packing of products involves many problems, such as safety, environmental protection and so on. In the mass production of industrial products, the outer packing is also a very important part

13、, and 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 recyclabl

14、e, 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

15、 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 packaging, the content of the printing will even include pictures and other information, very delicate. And in the outer packaging,

16、 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. Recycl

17、ed 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 liquid

18、 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 om

19、it 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 simp

20、ly 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 functi

21、on 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. An

22、y 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

23、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

24、 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 tha

25、n 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 diffe

26、rence 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 certification

27、, 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

28、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 ow

29、n 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 production of large quantities of industrial products, the amount accumulated is not small.Product shell prone to Jerry bui

30、ldingThe 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

31、 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

32、.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 adop

33、t 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-g

34、rade 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 environm

35、ental 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 fa

36、ct, 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

37、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

38、 will be greatly 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

39、 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.

40、Through these 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

41、 common certifications 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 necessa

42、ry to pass 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,

43、 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,

44、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

45、 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 worlds most stringent envi

46、ronmental directives. According to the relevant provisions of the RoHS certification standards, since July 1, 2006,All electronic and electrical equipment sold in the EU market must prohibit the use of lead (Pb), mercury (Hg), cadmium (Cd), six valence chromium (Cr6+) and other heavy metals, as well

47、 as polybrominated diphenyl ethers (PBDE) 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 i

48、t 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

49、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 c

50、onsiderations, 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 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