What are the advantages of LED displays? What is the price of LED displays? What is the difference compared to traditional LCD displays? This article refers to the address: http:// LCD LCD market fights fiercely The current LCD market can be described as chaotic, and various specifications of products coexist in the market. Only 16:10 widescreen has 19, 22, 24 or even larger size melee, and the 16:9 widescreen is a sudden rise. The situation is even more confusing, the prices of the two series of various specifications are staggered, and the price difference between 19, 22 and even 28 inches is more than a few hundred yuan, and even less than tens of dollars. The quality is also uneven, and some large-screen displays are arbitrarily shoddy in order to control costs, from core components to shell designs. Obviously, the previous method of determining the product to be purchased by size alone is not suitable at present. LED LCD "spoiler" display market The addition of LED-backlit LCDs has made consumers more confused. LED-backlit LCD is based on traditional liquid crystal, and the backlight system has been changed from fluorescent to LED. However, both display performance and longevity have made great progress. More importantly, this display has been developed for nearly a year. The price has dropped from the original thousands of dollars all the way to the current 2,000 yuan, and the traditional LCD is in the same price range. When consumers face so many choices, what should they do? How much is the LED LCD display effect? ​​Is it worthwhile for us to pay for it? LED backlight as a new technology, what are the performance advantages? LED LCD Whether the long life and low power consumption can offset the price difference between the traditional LCD and the traditional LCD. In order to solve these problems, we have gathered several representative LED liquid crystal products, and we hope to test and analyze them. Let consumers choose a product that is more suitable for them in a foggy LCD market. The low-cost LED display currently on the market is designed with white backlight Since LED backlights are still relatively new technologies, major manufacturers are now applying them to high-end products. For example, Samsung's XL20/XL24/XL30 products are positioned in professional-grade markets and are expensive. However, this type of product uses RGB three-color LED backlight, that is, each LED light source can emit red, green and blue colors at the same time, so its color expression can reach a very high level. Of course, not all manufacturers have positioned LED backlight LCDs so high. For example, ViewSonic's VLED221wm is also LED backlight, but the price is much gentler, 3999 yuan. The price of V19/V22 introduced by AOC is 1699 yuan and 1999 yuan respectively. The price of such products is low, but it uses another kind of backlight: white LED, that is, the LED in the backlight only emits white light. So what are the advantages of this product, and whether there is value in the purchase at this stage, we will give you a detailed answer now. Table 1 LCD and LED respective advantages table From fluorescent tubes to light-emitting diodes In the past, the backlight used in liquid crystal displays was called CCFL, which can be simply understood as a very small fluorescent tube. LED is a kind of light-emitting diode. What we see in daily life is LED flashlight, which has the advantages of high brightness, long life and small size. The LED liquid crystal only changed the backlight from the traditional CCFL to the LED, and there was no change in the panel type. LED white backlight Five advantages of having the advantages ★More colors ★More uniform brightness ★ smear and dynamic contrast ★ more power saving ★ lighter and thinner Contrast one, the color is more abundant, the LED gamut range is as high as 100%~130% At present, the color of the liquid crystal display is still not satisfactory. In the eyes of many users, the color of the liquid crystal display cannot match the CRT display of the peak period. In the current stage of panel manufacturing technology can not achieve a big breakthrough, only through the improvement of backlight technology, it is expected to improve the color of the liquid crystal display. LED display color gamut range up to 100%~130% At present, the mainstream CCFL (Cold Cathode Backlight) cannot be decomposed into more colored light due to its own spectrum limitation, and the color gamut is only about 70% of NTSC. The use of LEDs as backlight sources is different. The light emitted by LEDs has a wider range of chromatograms, and its color gamut can reach 100%-130% without 30% color loss like traditional CCFL backlights. Therefore, the color of the LED-backlit display should be more full, and the details of the picture are clearer, and the color transition is more natural. For the user, this also means better picture quality when playing games or watching HD movies. Now let's compare the AOC V22 with the ordinary 22-inch widescreen to see if the LED LCD is as good as the theoretical one. Contrast test: LED liquid crystal display is more natural LED liquid crystals have unparalleled advantages in terms of color purity and transitional naturalness. Take a picture of a fallen leaf as an example. On a normal LCD display, the color on the leaves is very messy. On the middle of a leaf, there is a very clear dividing line between red and green. On the LED-backlit LCD, although the middle leaves have green, red, purple, orange and other colors, the transition between colors is extremely soft. The most amazing thing is that on the CCFL LCD, a leaf is displayed in green, and on the LED-backlit display, we only see that the leaf is actually pale yellow, and the LED display is more visible. natural. This is very important for users who like to watch big movies. Tip: What is the NTSC color gamut NTSC color gamut: the sum of the colors under the NTSC standard. NTSC is a set of protocols for the transmission and acceptance of television broadcasts by the National Television Standards Committee. The color depth is set at 24 bits (approximately 16.7 million different colors), which exceeds the number of colors that can be distinguished by the human eye. (12 million - 14 million), so it is also called true color. The past CCFL backlight LCD has been deceiving our eyes. LED LCDs have an extremely powerful color transition capability, and thanks to this, the details in the picture are more clearly presented to us. Contrast 2, LCD brightness is higher, brightness uniformity is better Insufficient brightness and uneven brightness on the screen. These two problems are particularly noticeable on large-size LCD monitors, which can make some places on the screen bright, some places dark, and also cause color deviation. Traditional LCDs are generally in the range of 300-500 lumens and LED brightness can reach thousands of lumens. The brightness of traditional LCD monitors cannot be too high, generally between 300-500 lumens. The brightness of LEDs can theoretically increase indefinitely. Therefore, the LED backlight display can even achieve thousands of lumens to meet the needs of various users. In addition to brightness, the biggest benefit of LED backlighting is better brightness uniformity. The traditional CCFL backlight display has a slender shape. No matter how the layout is, it cannot make the brightness of each point on the screen the same. The brightness difference between the center and the periphery of the screen is about 100 lumens. LED backlights use a combination of point sources to illuminate, distributing many small LEDs evenly, which allows the difference in brightness at each point on the screen to be controlled, and as the number of LEDs increases, this difference can continue reduce. Higher brightness For users who like HD movies or who need graphics, the details on the screen will be clearer. Better brightness uniformity will make it impossible for the screen to appear brighter, and some places are black. The brightness difference between LED points is about 15 lumens and the LCD is about 80 lumens. The brightness test is still based on the illuminance meter, while the brightness uniformity test is to take 9 test points on the screen. After testing the brightness of each point, the point in the center of the screen is taken as the standard to calculate other points and this The difference between the points, the smaller the value, the better. In terms of brightness uniformity, the performance of the LED liquid crystal is very good. The difference in brightness between the surrounding 8 test points and the central reference point is only about 15 lumens, and this data is about 80 lumens on the CCFL liquid crystal. It is obvious that the brightness uniformity of the LED liquid crystal has reached a high level.
Maximum
module conversion efficiency up to 16.6%
Positive
power tolerance 0~+3%
Severe
environment resistance
Wind
load 2400 pascal
Snow
load 5400 pascal
|Highly
transparent low iron tempered glass
Excellent
performance under low light environment
Anodized
aluminum for improving corrosion resistance
Certification
IEC61215&IEC61730
10-year
product warranty for repair and workmanship
25-year
warranty for power output
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