Xie Yiyi said that the white light LED 's grievances and hatreds can't help but mention the brothers and walls of RGB and white LEDs. The two are all the same, they all hope to achieve the effect of white light, but one is directly in white light, the other is red and green. The blue three-color mixed light, one said that the purity of the other party is not enough, the price is too expensive, the other rebuts that the color is beautiful, and the other party's old age is declining. Such a war, I am afraid that it will not stop in the short term.
However, although the green radish is good, but it is not so simple in terms of technology and cost. Some things can't be compromised, because in terms of frequency or voltage consistency, if there is no adjustment, Then the mixed light is likely to be out of control at all. Therefore, both technologies are done by people, and each has its own market. However, whether the market can determine the technology or the technology to pull the market may cause considerable discussion.
RGB color is in the way
People who like high quality should find it easy to find that the color of some LED backlights is particularly clear and bright, and even has a high-definition TV. In this case, it is the characteristic of RGB. The red is red and green. It is the characteristic of green, blue or blue. In the color mixture of light, it has more characteristics. Just like the painter's palette, it will make the most realistic color world perfect and make a beautiful life.
From seeing the bright future of white LEDs using phosphors, Lin Zhuxuan, the general manager of the US light source, who has already announced the abandonment of this line, said that not only is the problem of light attenuation, but other problems are also a major cause. He clearly stated that white LEDs are obviously inferior to RGB in terms of sharpness and color purity. He also said that the overall brightness and sharpness of RGB is five times that of phosphor white LEDs when the RGB overlaps. In addition, the problem of light attenuation, expensive wafers, is also a major reason for his optimistic RGB lights.
In addition, RGB is obviously more diverse than white LEDs. For example, such as car lights, traffic signs, shop windows, etc., when you need to use a certain band of lights, RGB color mixing can be arbitrary, in comparison, White LEDs are more disadvantageous, so of course they are more effective.
However, what is the principle of imaging RGB lights? Cai Zhengda of the Institute of Electronics and Optoelectronics of the Industrial Technology Research Institute said that RGB lamps are integrated with the three primary colors. In addition, there are blue LEDs with yellow phosphors, and UV LEDs with RGB phosphors. Overall, both have their imaging principles. However, the problem of attenuation and the influence of ultraviolet light on the human body are problems that are difficult to solve in the short term. Therefore, although the demand for white light can be achieved, there are different results.
Figure 1: The color principle of white LEDs is different, which affects the overall performance.
White LED reflects cost
White LEDs based on phosphors, although they can't resist the problem of old age, can have a foothold in the market. The most important problem is actually the cost!
One win over three, which is the main reason for the breakthrough in the market. Zhang Hongwei, business development manager of high-performance analog products in Texas Instruments, said that at the current cost, RGB lights are significantly higher than white LED lights. The only place for competitiveness is on the backlight board. In the future, it is possible to compete with white LED lights. As for other places, it is mainly based on auxiliary lighting. As for RGB lights, there is still a problem. It is the reaction time, the current RGB lights. Most of the reaction time is about 4-8ms. He said that if one day goes to the hypermarket, the response time of all RGB lights can be 1-2ms, then the era of RGB lights is coming soon.
However, he also said that in the color mixing technology, if it is not pure enough, it will plant a failure. After in-depth analysis, he pointed out that the adjustment of color temperature is often the most difficult part. When the color temperature is high, the whole color tone is biased. Cool color, when the color temperature is low, the whole color is a warm color, so the color mixing technique must be quite good, otherwise it will cause considerable problems.
Why is there such a problem? Mainly in the frequency and wavelength of the three colors, Agilent, senior project manager of the Application Engineering Department of Agilent's Electronic Measurement Group, said that the red light frequency is the lowest, the wavelength is the longest, up to 611nm, and the green light is the second. Up to 544nm, the shortest blue light is only 440nm. Under such conditions, it is naturally problematic to package the three RGB dies together.
Therefore, he said that when RGB is separated, it can be controlled separately. Although it can be directly controlled, the color mixing is also good. However, it is a big problem to achieve mixed white light. Although the cost is expensive, the quality is relatively good. As for the white LED. In terms of lamps, although the cost is cheap, it can directly replace CCFL and become the main technology of LEDs. However, relatively speaking, because of the problem of wavelength frequency, they are packaged together, so that the scattering will be unstable.
However, the control problem of RGB lamps still needs to be strengthened. For example, if one of the lights is broken, it will be quite obvious on the whole screen. On the contrary, the white LED lights can complement each other because it is a side-by-side relationship. Can make up for a broken LED, and make up the uniformity, so that the overall situation does not look too bad.
Figure 2: Red, green, and blue colors of different wavelengths, which are packaged on the same die, causing instability.
RGB or CMYK
Now that there are three colors, some people may have thought that some art publications are based on CMYK. Can such color mix and match be applied to white LEDs? Xunzi said that the current RGB wavelength is the most primitive phenomenon in the overall spectrum. The concept of CMYK is different from the RGB method. The main reason is that the backlight is mainly reflected light, RGB can do As far as CMYK is concerned, even if the saturation is higher on the general imaging principle, it is equal to the conversion coordinate of RGB in chromaticity. It is not necessarily ideal after color formation, and as far as he knows, it is not currently heard in the market. Said that there is such a way.
If you want to solve the problem of RGB due to frequency mixing, Zhang Hongwei said that there is a color filter in the market for filtering and integration, mainly based on RGB, even RGB plus black color mixing principle. This is mainly because the RGB three-color reaction time is long and short. In the future, if the RGB three-color reaction time can reach the ideal state of 1-2ms, it should be more in line with the cost requirement, because it is no longer necessary to use color filter. The film can be filtered accurately, and the color filter is mainly controlled in the United States, Japan and other countries, so the advancement of technology helps to break the monopoly of filters in these countries.
In addition, he also said that there are many specialty stores in the current market, selling different sets of lights for each family's demand for color, whether it is coloring or filtering, this effect adds to the flexibility after customization. It can also make the lamps for living lighting more colorful, and it can stimulate the market to do various conversions and needs.
Is the market still technically dominant?
In the current situation of contending, whether RGB technology will become the mainstream, or white LED will become the mainstream, in fact, there is no certain answer, from the perspective of each point of view, the application and cost of the market will be the main key.
Zhang Hong clearly stated that in addition to the problem of reaction time in RGB lamp, the price is a major cause, so even after two years, it can climb up with the white LED in the backlight market, but the price is still high. It is a fatal injury, so in the layout of the lighting business, white LEDs will still be the main source of illumination, while RGB lamps are mainly auxiliary lighting.
Coincidentally, Xunzi also believes that the cost of RGB lamps is too high. Although the overall color mixing performance is good, for midstream and downstream manufacturers, it is impossible to reflect the market price, which will make it difficult to ship. Therefore, he also believes that Some technical breakthroughs are necessary, but the price issue is the primary solution.
However, Lin Zhuxuan, general manager of the US Light Source Technology, does not think so. He pointed out that the cost of RGB lamps may be expensive in the present, but overall, the purpose of lighting is not to brighten, but to reconcile the color, if it is to be bright. In the evening, when there is enough brightness, there is no need to turn on the lights. In the evening, in addition to watching the brightness of watching TV and reading books, "Would you like to be so bright?" Therefore, he thinks that in the average family's number of pings, RGB lights It is very reasonable and logical to build lighting lamps.
Taiwanese technology will be caught up?
Whether it is RGB light or white light, as long as it can be accepted by the market is good light! However, in Taiwan's white LED technology, will it be replaced by China, which is cheaper in price, labor and equipment because of the OEM relationship? Zhu Mudao, head of the Optoelectronics and Applications Systems Institute of the Institute of Electronics and Optoelectronics, ITRI, said that in the short term, Taiwan’s technology is still ahead of China, and such concerns are not necessary.
However, he also clearly pointed out that in the upper and middle reaches of the industry, Taiwan’s advantage in leading the gap is relatively large, but in the downstream industry, the lead is not large, and China has established a semiconductor lighting office, driven by national power. However, the difficulty lies in the integration of related industries, and in the international production part, the quantity of products can be obviously insufficient. Therefore, at present, China is still unable to catch up with this aspect.
However, he also pointed out that because China's hinterland is vast, the market has a high appetite. Even if the technology is done in Taiwan, most of the finished products will be sold to China. Therefore, it cannot be ignored that the powerful magnetic effect of China's rise will be marketed. The competitive advantage has absorbed the advantages of the original Taiwanese business. Therefore, the key point should be how to quickly integrate Taiwan's technology, in order to make a spur to the end, and to push the road of research and development of its own brand to the last glimpse.
Figure 3: Whether it is RGB light or white light, it is good for the market to accept
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