The high-tech LED industry research center predicts that domestic LED TV sales will increase by three times in 2010, while LED TV consumers pay attention to 70%. This means that as an upgrade of traditional LCD TVs, LED TVs will become the mainstream products of the color TV industry in the future. According to the analysis of the product development route of LED TV in the last two years, we can find that LED TVs have three kinds of technology branches according to the types of backlights, namely: RGB LED, white LED and edge LED. Today we mainly perform a simple analysis of RGB-LEDs.

Widely adopted by Japanese manufacturers

RGB LED backlights are a technology that was born very early. The RGB LEDs are modulated into white light by red, green and blue LEDs with the best optical properties. The position of the RGB-LED backlight is not much different from that of the conventional CCFL, and is still directly behind the liquid crystal panel layer. Therefore, from the structural point of view, the LED TV adopting this technology does not have a significant difference in appearance and ordinary LCD LCD TV. In addition, RGB LEDs can also support backlight area adjustment technology, brightness adjustment is very easy to achieve, so in contrast, often can achieve 10 million: level 1 dynamic contrast, which is very important to improve the image quality of TV.

Due to the use of RGB three primary color independent light-emitting elements, the gamut color range of RGB LED can reach more than 120% of NTSC, and some well-tuned models can even reach the color gamut range of about 150%, completely meeting or surpassing plasma TV. The standard. Therefore, it is widely adopted by Japanese manufacturers who pay attention to image quality. For example, Sony and Sharp's top models adopt RGB-LED backlight technology.

Prices are difficult to fall in the short term

Because of the obvious advantages of RGB LED technology, the global color TV giants such as Xinli, Sharp, and Samsung have invested heavily in R&D. In the past few years, Sony, Samsung, and Sharp have 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 developed over the years, technically, RGB LED is perfect, but the high cost problem has been difficult to overcome. After comparing various costs, major manufacturers have focused on these years. In the research and development of white LED light sources, these companies have gradually reduced their R&D investment in RGB LED technology, and the RGB LEDs are getting smaller and smaller in the market. Although Sharp and Sony also introduced a small number of RGB LED products, as Sharp's high-end products are available for sale, the price is expensive and the market is difficult to popularize.

Breakthrough in separate dimming and cooling

 

Although the performance of RGB LED TV is very good, it is not perfect. RGB LED requires separate dimming circuit and better heat dissipation structure, which causes the TV structure to be complicated and difficult to be thin and light. The advantages and disadvantages of heat dissipation directly affect the length of LED life. Because the outstanding features of RGB LED are not ultra-thin, RGB LED heat dissipation is not a problem at present, but since LCD TVs are developing in the direction of lightness and thinness, RGB in heat dissipation technology LEDs have yet to be technologically advanced.

 

Recent improvements in RGB LEDs have significantly improved white and color LED subtitles. The red, green and blue RGB LEDs package the chips in red, green and blue to emit different colors of light. In the past, the color mixing light emitted by RGB LEDs was very unstable, and high-power LED drivers successfully solved this technical problem. Recently, high-power RGB LEDs, such as Luster's AstraLED, make white and colored light very stable and soft.

Large-scale listing in the past two years is not realistic

Subject to cost pressures, the LED market is highly positioned. Among them, the large-scale listing of RGB LED backlight products in the short term is not realistic. When RGB LEDs are used as backlights, they are not completely 1:1:1. The most common solution at present is one red LED, one blue LED and two green LEDs. This combination is because each color of LED has a certain difference in luminous efficiency, and it is necessary to achieve matching of three kinds of light sources by combination. Due to the complexity of RGB LED technology, it is far from the technical requirements of commercial production. At present, it does not seem to have the conditions for popularization and promotion. Therefore, there are few products adopting this application mode. Generally speaking, it is aimed at and covering high-end consumers and professional people. From appearance design to performance equipment, it has different requirements. Therefore, RGB LED is difficult to carry out large-scale promotion and listing in the low-end market.

The future may become the mainstream of LCD TVs

 

The edge-lit white LED LCD TV has become the mainstream of LED LCD TVs due to its low cost and easy to realize ultra-thin technical advantages. However, RGB LED backlight technology has the advantages of high contrast, high color reproduction, and low power consumption. The RGB LED-backlit LCD TV has much better color performance than the white LED LCD TV. The former has a color gamut of more than 120% and the latter has a color gamut of about 70%. At present, white LED has become the mainstream of low-end LED LCD TVs, which is forming a rapid replacement for CCFL. However, we believe that as LEDs continue to increase in volume, their performance continues to increase and prices are gradually reduced. It is believed that the cost of RGB LED backlight modules will continue to approach CCFL, coupled with its high color reproduction, high dynamic contrast, low power consumption and many other advantages. Bring higher display quality to LCD TVs, and believe that RGB LEDs will become the mainstream of LCD TVs in the future.

Conclusion

We are already very aware of the high color rendering of RGB LEDs, and we are now looking forward to the high performance and cost-effectiveness of RGB LEDs. In fact, I think that major manufacturers should not give up the development of their technology because of the high cost of RGB LEDs. The cost is important, but the unique advantages of RGB LEDs are unmatched, as long as the major manufacturers cooperate with each other to strengthen R&D and Capital investment, mass production, and cost price will naturally decline, and market promotion will not be a problem.

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November 29, 2023