First of all, the body is thin and saves space: compared with the relatively bulky CRT display, the LCD display only has one-third of the space of the former.
Second, power saving, no high temperature: it is a low-power product, which can be completely non-hot. Compared with CRT monitors, high temperature is inevitable due to imaging technology.
Third, no radiation, good for health: LCD monitors are completely radiation-free, which is a boon for people who work in front of computers all day.
Fourth, the soft picture does not hurt the eyes: unlike CRT technology, the LCD screen does not flicker, which can reduce the damage to the eyes of the monitor and make the eyes not tired easily. ..
Buy LCD display notes:
First of all, size: 15 inches is the choice of most people, but in recent years, it has become popular with 17 and 19 inches. If you are only dealing with paperwork or surfing the Internet, 15 inches will meet their needs. If you are in computer graphics, video editing, large size is more suitable for work.
Second, viewing angle: For 15-and 17-inch monitors, most of them are used by one person, so a vertical viewing angle of 120 degrees is enough. Above 18 inches, it needs more than 150 degrees. Youpai's various machines adopt special technology and can reach a 170-degree viewing angle.
Contrast ratio: Generally speaking, the greater the contrast ratio, the better. As far as the current technology is concerned, the most basic contrast ratio of LCD brightness of various sizes should be 400: 1.
Fourth, brightness: for those who use computers to handle paperwork, 250nits brightness is enough; If you often play computer games, watch digital discs (DVD) or TV, then you must choose 450nits brightness.
Response time: Compared with the shadow response time of movie props of at least 40 milliseconds (ms), the current products will not appear, and the response time of our color LCD with less than 25 milliseconds should be one of your basic considerations. However, if the appreciation is based on animated movies or playing online games, it is recommended to choose the response time of model 16 ms.
VI bright spot: the market is not a certain standard, but the bright spot of each color LCD is not more than 5 shortcomings of LCD.
There are many low-priced 14-inch or 15-inch LCD monitors on the market now, and many businesses have praised LCD monitors to the sky. To be sure, LCD monitors have many obvious advantages, but for various reasons, the current sales of low-priced LCD monitors are only the "low end" of LCD products, and there are many inherent shortcomings.
1. Price
Although the price is lower, compared with CRT, the price of LCD in the monitor family can be described as "noble price", which is only 3,000 yuan for a 15-inch flat panel display, and only about 1000 yuan for a flat panel display of the same size ... According to expert analysis, the main reason for the high LCD screen is the low yield in the manufacturing process, which leads to the inability to reduce the cost. At present, only some Japanese and Taiwan Province manufacturers can produce LCD screens, and the technology has not been fully popularized, and large-scale production competition has not yet formed, and the quality is also very different. In the international market, the price difference between different grades can reach tens to hundreds of dollars.
2. Interface
Liquid crystal display digital interface mania. Theoretically, a pure digital LCD device connected to the host computer should be a digital interface, and the advantages of using digital interface are self-evident. First, the mold can be reduced.
In the conversion process, LCD liquid crystal displays do not need to adjust the clock frequency and vector, but most low-cost LCD liquid crystal displays will produce signal loss and interference in the conversion process; Reduce the corresponding conversion circuits and components; Secondly, there is no need to adjust the clock frequency and vector, but most low-cost LCD liquid crystal displays must completely avoid the clock frequency of pixel L CD in the conversion process. In addition, the digital interface of LCD has not yet formed a unified standard, and display cards with digital output are rare in the market. Therefore, the key advantages of LCD are difficult to play.
3, the viewing angle is small
The visual deflection angle of early lcds is only 90 degrees, which can only be seen from the front, and it will show greater brightness and color distortion from the side ... The visual deflection of lcds in the market is generally about 140 degrees, which is enough for personal use, but if several people watch it at the same time, the distortion will become obvious. ..
4. The response time is too slow
Response time is a specific indicator of LCD. The response time refers to the response speed of the input signal of the LCD display, and each pixel with short response time will not occur when displaying the image of the moving image path. It is very important to watch videos and act quickly when playing games. Fast enough response time ensures the continuity of the picture. At present, the response time of the general LCD market has been compared with before, usually, about 40ms has made a great breakthrough. But it still can't meet people's demand for high-quality 3D games and DVD movies.
5. Low brightness and contrast
Do you want a flashlight? The joke is about the brightness and contrast of LCD. Because liquid crystal molecules cannot emit light by themselves, liquid crystal displays need to rely on external light to assist in light emission. Usually 140 lumens per square meter. There is still a gap between the parameter standard and the actual standard of some manufacturers .. In order to explain here, small-sized lcd used to be mainly used in notebook computers with dual lights adjustment, so their brightness and contrast are not very good. ..
6. maintenance problems
LCD "pixel" problem. Glass, which is commonly used in LCD materials, is easily broken. In addition, each pixel is very small, which often leads to the phenomenon of broken pixels. It is usually called "dead pixels", which can not be repaired, but only the whole display screen is replaced, and the price is often very expensive. According to the actual process requirements, the liquid crystal screen of LCD is sprayed on ITO conductive glass sealant or adhesive, cellophane or glass particles through fine and uniform layers in screen printing. The specific materials used can be divided into pure solids or a mixture of solid solutions, and then bonded with another good screen-printed conductive paste or ITO glass sealant as required according to the position, so that they do not form a cured liquid crystal cell with a certain thickness.
In the process of box making, special attention should be paid to the following points:
Temperature control of lining 1 glass. In general, when using pure solid liner, the glass temperature should be the same as room temperature; When using the mixed liquid liner, try to keep the glass in a hot state just dried from the oven.
Joined ②LCDLCD, it should be appropriate to apply pressure to two pieces of glass to prevent the spacer box fragments from damaging the orientation layer.
When 3 is bonded, the two pieces of glass should be kept at room temperature, so as to avoid the uneven thickness of the box caused by the glass deformation caused by the temperature difference between hot and cold.
A well-packed LCD box needs to be handled with care, because it has not solidified and the bonding is not firm, so as not to cause position change.
⑤ When wet spraying method is used, the gasket prepared by the mixture must have good compatibility, and there can be no agglomeration and precipitation.
