Technical status of LED as backlight

Following more than 10 inches of notebook computers (NB) a large number of LED backlight applications, the market began to speculate when a large number of LED tv. LEDinside pointed out that, due to the LED will be able to make TV quality contrast is more obvious, the model is more thin, so the future of LED TV will be expected to high quality and ultra-thin two trends. However, due to the more than 1 thousand LED backlight, regardless of uniformity and reliability is a problem, leading to the current high cost of LED tv. In terms of price and ultra thin balance, it is expected that consumers will still take the price as a priority. Is expected this year, the global LED TV shipments accounted for less than 1% of the shipments, to 2012 shipment penetration is expected to exceed the level of 10%.

At present, LED backlight technology can be divided into straight down (Direct Type) and side light (Edge Type) two. Among them, the direct backlight technology at this stage of the application is more, refers to the backlight directly placed in the back of the panel, the use of the diffusion plate to make the light source. Side light technology is the LED module in the panel around the use of light guide plate to the uniform projection to the rear panel.

Compared to the two technologies, side light can save more LED particles. To 46 inches panel, for example, straight down the use of the LED particles about 1100~1300 or so, while the side light of about 400~600. Due to the direct use of a large number of LED particles, whether or not to save electricity, depending on the manufacturer's design ability. The side light type due to the lack of CCFL and LED placed behind the panel, so the overall design can be very thin. However, it is difficult to adjust the light and shade in some areas because of the side light, which leads to the contrast and color saturation of the screen.

In the LED part of LED technology, backlight module manufacturers at this stage of production, mostly in R, G, B three LED do assembly, and direct type backlight technology collocation of regional control technology (Local, Dimming) in the area of independent blocks, brighten the screen or dim makes face painting than the more obvious. Many TV makers claim that their dynamic contrast can be as high as 1 million to 1, or even higher.

In addition, there are also manufacturers to adopt green fluorescent powder (RG Phosphor) with blue LED, to stimulate the white light, so not only can save LED quantity to reduce the cost, the excited white light than the blue LED and yellow phosphor (YAG) effect is good.

In summary, LEDinside said that the mainstream of the future LED TV will continue to develop in two directions, one is high quality, one is ultra-thin. However, due to the more than 1 thousand LED as backlight, uniformity and reliability are very big problem, which makes the LED TV is still facing the problem of high cost. Therefore, although there has been a TV manufacturers will LED LED backlight module collocation in more than 46 inches big inch high-end models, emphasizing the image quality and contrast, but are at a very high price, the main top consumers.

According to Witsview for the North American TV market research shows that the current LED TV retail price and the price of traditional LCD TV, there is still a big gap. With a 40 inch, 46 inch LED TV and Full HD LCD TV price comparison, although reduce spreads has just launched, but the two kinds of specifications of the retail price difference is more than 30%, and this is only the survey in 2007 as a benchmark for the old model. Because there are new LED TV to be listed in 2008, so the recent LED TV old models are rapidly falling prices. If the price of the new models to be listed by the end of 2008 to be considered, LED TV and traditional LCD TV spreads will be greater.

On the other hand, LED TV in the pursuit of high quality and ultra light, LEDinside pointed out that if the consumer preference for high contrast images, there are actually present plasma TV (PDP TV) you can choose, do not have to buy LED TV can not. While thin and attractive appearance, but the family does not need to move the TV often, for the general consumer, the price of the low priority may still be higher than the thin appearance.

Overall, LEDinside believes that the current LED TV technology enthusiasts and consumers are still the top customers to accept the product. Estimated 2008 LED TV accounted for less than 1% of global TV shipments. And after 2010, LED backlight technology matures and the cost of a substantial decline, LED TV penetration will gradually rise. Estimated 2010 LED TV penetration will be close to 5%, the penetration rate is expected to increase to 7%-8% in 2011, the penetration rate will exceed 10% in 2012.