Top ten truths about "LED TV" you don't know
Among the first-tier international brands, Samsung, LG, Sony and Sharp have all launched "LED TVs", so what kind of new technology and concept is this "LED TV"? If you do n’t want to be fooled by the manufacturer again, you have to look at the ten truths you must know about the “LED TV†summarized by the author below. 1. LED TV is not a new type of TV technology Although many brands directly promote their products in the name of "LED TV", in fact, it is just an ordinary LCD TV that replaces CCFL backlight with LED backlight. It should be more accurately called "LED backlight LCD TV" ", Rather than a TV product that completely adopts the principles of the new display technology. For example, the ultra-thin LED TV launched by Samsung this year is actually an LCD TV. It is worth noting that consumers should distinguish between LED TVs and OLED TVs. Although the abbreviation is only one letter different, the latter is a technology that is completely different from LCD TVs. It uses the principle of active light emission. widely. 2. The LED backlight is divided into two types of incidence: direct-beam and side-beam The direct type is also called localdimming or fullarray, which means that the LED lights are evenly distributed on the back of the entire LCD screen, and the light directly passes through the panel. For example, Sony's flagship XBR10, Sharp XS1. The side-shooting type is also called edge-lit, which means that the LED lights are only arranged on the edge of the screen, and the light is evenly distributed to the screen through the precision-designed light guide plate. For example, Samsung Slim 7000, 6000, Sony 40ZX1. Three, direct-beam LED can show a deeper black level, but it is prone to high regional brightness Direct LED can be used with area driving technology to light up the partitions when displaying the picture. According to the actual picture needs, if the picture of a certain area is completely black, then this area will not light at all, so that a deeper Black effect, such as Sharp LE700 series. The ordinary CCFL and side-emitting LEDs must be fully lit at all times, and the performance of the black level is definitely not as good as that of direct-emitting LEDs. However, this kind of area driving technology also has disadvantages, that is, if a certain area has a very dark and dark screen at the same time, and there is a bright screen, then the LEDs in this area are driven at the same time, then this area The place where the black screen should have been will be brighter than the surrounding black. The more obvious models with such problems can refer to the Toshiba SV670. In addition, Samsung's 8500 actually has this situation, but it is not so obvious. To solve this problem, unless the LED lamp driver can achieve one pixel corresponding to one LED, but this is currently not a very realistic idea. Fourth, side-emitting LEDs can be made very thin, but the brightness is easily uneven The biggest feature of the side-emitting LED is that the TV can be made very thin, but the brightness of the screen is easy to produce unevenness. For example, when you want to display a completely white screen, you will find that the brightness of the surrounding edges is higher, and when you display a completely black screen, you will find that the edges are transparent or gray. 5. LED backlight does not improve the viewing angle of the LCD When you watch the LCD TV, stand too high or squat too low, or stand at a position with a large horizontal angle, you will find that the screen color and brightness will be significantly distorted, only you are in front of the screen Only then can you have vivid and ideal picture effects. With the LED backlight, there is no improvement in the viewing angle of the liquid crystal. For example, the Samsung 8500 can have excellent black level performance. You can get good results if you sit in front of the watch, but if you move to a more left or right angle, you will find that the picture quality is still certain. It has dropped, and many friends who have actually seen it will think that this change is more obvious. why? In fact, this is because when you were watching directly in front of you, the picture effect was really good. According to the visual habits of the average person, as long as you have seen a picture with a better effect, when you return to a less good picture, your eyes are very sensitive. Yes, your eyes have been "raised".
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