LED backlight technology battle: side-entry white light temporarily leading

As a perfect upgraded version of CCFL (Cold Cathode Fluorescent Lamp) backlight , LED backlight technology has been highly praised by Sony, Sharp, Samsung and other color TV giants since its launch. These companies have also invested heavily in research and development to reduce costs. When Sony and Sharp are committed to discussing the perfect three-color RGB-LED cost reduction solution, Samsung has taken the lead and launched the white light source. At the same time, it uses the side-in structure to replace the direct type. Although it is not perfect, it boosts. The popularity of LED LCD TVs.

RGB-LED high cost is difficult to fall in the short term

Any good technology, in order to be widely used, must significantly reduce costs. During this time, one of the most popular vocabulary in the color TV market was LED. This sensational technology that was sensational four or five years ago became the protagonist of this year's market because of the sharp decline in manufacturing costs.

Turning over the history of LED technology, we can easily find that LED LCD TVs are popular today, and they are closely related to color TV manufacturers knowing how to "give up".

There are three types of LED backlight technology: direct-lit three-color RGB- LED light source , direct-lit white LED light source and side-mounted white LED light source. Among them, the earliest appeared is the three-color RGB-LED technology.

Compared with the traditional CCFL backlight technology, the advantages of RGB-LED TV are mainly reflected in the two aspects of color expression and contrast: RGB-LED TV has a wide color gamut that can reach NTSC 120 due to the use of RGB three primary color independent light-emitting components. More than %, some well-tuned models can even reach a color gamut of about 150%, fully meeting or surpassing the level of plasma TV.

In addition, RGB-LED TV can also support backlight area adjustment technology, brightness adjustment is very easy to implement, so in contrast, it can often reach tens of millions of dynamic contrast, which is very important to improve the image quality of TV. .

The advantages of RGB-LED technology are obvious, and the global color TV giants such as Xinli, Sharp and Samsung have invested heavily in R&D. In those years, Sony, Samsung, and Sharp all introduced some products based on RGB-LED technology, but the price is too high. From the emergence to the present, although RGB-LED technology has undergone many years of development, there is no substantial reduction in cost. Slowly, these companies have reduced the R&D investment of RGB-LED technology, and the more RGB-LED sounds in the market. The smaller it is.

The reporter learned that several major companies that have previously promoted RGB-LED LCD TVs are now doing white LED TVs. For example, the 8000 series LED LCD TVs released by Samsung at the beginning of the year adopt side-lit white light mode, and Sharp introduced white light LED light sources. The LE700 series and the new KLV-40ZX1 TV released by Sony are also using white LED backlights. In the meantime, although Sharp has introduced a small number of RGB- LED products , it is expensive to sell as a high-end product of Sharp, and there is no possibility of market popularization at all.

Cost is expected to drop sharply next year

"Technically speaking, RGB-LED is perfect, but the high cost problem has been difficult to overcome. After comparing the various costs, we will focus on the development of white LED light source in the past few years." Samsung Electronics Digital Imaging Research and Development Center Standing Hong Chengyu told reporters.

In contrast, the RGB-LED color gamut performs slightly better. The disadvantage is that the cost is higher. The price of the finished TV product is still difficult for ordinary consumers to accept. The white LED light source is slightly inferior to the RGB-LED in the color gamut. Its relatively high contrast and affordable cost are unmatched by RGB-LEDs.

Since the end of last year, LCD TVs using white LED backlights have been appearing in front of people. According to the statistics of the reporter, the Samsung 8000 series all use white light side-in LED backlights; Hisense Blue Media LED TVs use white light direct-lit LED backlights; Skyworth launched a cool-open white-light ultra-thin LED TV before the National Day, covering 26 inches-47 Inch full range and more. Other manufacturers including Xinli, Sharp, Konka, Changhong, Tongfang, etc. have launched their own white LED light source LCD TV.

According to statistics from DisplaySearch, the annual price of white LED light sources has dropped by at least 20%. In white LED LCD TVs, the cost of light sources exceeds 1/3 of the whole machine, which will inevitably lead to huge price reduction and market for LED TVs in the future. The possibility of popularization. "At present, the price of LCD TV with white LED light source is 1.5 times that of ordinary CCFL backlight LCD TV, and it is expected to drop to about 1.2 times next year, thus achieving a complete replacement for CCFL." Huang Xinzhong, general manager of Konka Multimedia Marketing Division The reporter said.

It is not only terminal manufacturers that continue to lower prices for white LED light sources. Wei Zhiguang (Shenzhen) Co., Ltd. Yao Zhitu even said: "In the next few years, the cost of white LED backlights will definitely be lower than the current CCFL backlights. Cheap."

In addition, the increase in investment by terminal companies is also conducive to the reduction of the cost of white LED LCD TVs. Recently, Tongfang is planning to build the largest LED industry base in China. It is reported that the initial investment of the project is nearly 1 billion yuan, and the annual output value reaches 10 billion yuan. “1 billion yuan is the input of the first phase of the project.” Wang Lianghai, general manager of Tsinghua Tongfang Digital TV, said that after mass production, the cost of LED TV will drop.

Side entry meets alternative CCFL conditions

Due to the complicated technology of the direct-type RGB-LED light source, it is far from the technical requirements of commercial production. At present, it does not seem to have the conditions for popularization and promotion, so there are few products adopting this application mode. The competition for the three types of LED light source solutions is actually the battle between direct-lit white LEDs and side-in white LEDs.

The reporter learned that there are representative manufacturers of direct-lit white LEDs and side-in white LEDs. For example, Sharp, Skyworth, Hisense, etc., which push down the white LED TV products and chips, and Samsung, Xinli, Tongfang, etc., which push the side-in white LED TV products and chips.

From the point of view of process design, the white LED direct-down structure is the easiest to replace the traditional LCD backlight application method, and its technical difficulty and the need to modify the product design are minimal. "Direct-lit RGB-LED technology, although there is no need to make major innovations in the original design of LCD TVs, but the structure of the backlight module itself is complex, so there are very few products using this application mode." Hong Chengyu told reporters, " In contrast, the side-in white LED technology has its advantages."

However, since the purpose of the side-in type structure is mainly to design a slimmer TV set, the original host power supply, circuit, screen power supply and heat sink of the LCD TV need to be improved. This will also lead to an increase in the cost of side-in white light, making it short-term machine cost higher than the more straight-line white LED TV of the backlight module.

On the other hand, the advantages of direct-lit white LED technology in picture control are obvious, which will make the technology of this technology superior to the side-in white LED technology in the final image display capability. "The two technical genres of Baiguang have their own advantages and disadvantages. It depends on who is industrialized faster. At present, Samsung LED TVs have the largest sales volume, and the chance of side-entry replacement of CCFL is bigger, but with the promotion of such as Hisense, Skyworth, etc. The large-scale promotion of domestic white-light enterprises, whether the future is direct or mainstream, is still difficult to judge.” Jin Xiaofeng, deputy general manager of Aowei Consulting, said.

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