August 08, 2020

Europe introduced LED Blu-ray restrictions

Europe introduced LED Blu-ray restrictions Regarding "blue light", if users of electronic products are asked, they will say that blue light will make the eyes feel tired, and therefore, in order to prevent the wear of anti-blue light glasses. If you ask monitor technicians, sometimes they will answer coldly: "Although there are many arguments, but there is no evidence." If you go to the optical shop, you will see the shop "protecting your eyes from the LCD TV and LED lighting Blu-ray damage prevention Blu-ray glasses" and other ads. Ophthalmologists will say that people’s eyes have two functions: “imaging” and “clocking.” Blue light has a lot to do with the eyes. Some ophthalmologists have begun to remind people of the impact of blue light on the human eye.

For those involved in the electronics industry, it is very important to specifically understand this issue in depth. It was at this time that the international society "1st International Symposium of BlueLight Society", which discussed the Blu-ray problem, was held in Tokyo in June 2013. Let us introduce some of the content published by the Society and review the past restrictions on the impact of electronic products on the human body. Hope to help everyone understand Blu-ray further.

Let us first talk about which spectrum of light each electronic product emits. Since there is no published data, it may not be easy to understand. Figure 1 shows the spectral concept of the white "bulb", "LED" and "organic EL" used by each light source. Among the three kinds of light sources, LEDs use blue light and yellow fluorescent materials to produce white light. The problem is that there is a peak (blue peak) at the wavelength equivalent to blue light (460 nm). When the back light of the liquid crystal display uses LEDs, the peak blue light intensity can be controlled, but it is difficult to change the peak wavelength. Therefore, the LED display and lighting may affect the user due to the blue peak.

LED unavoidable "blue issue" Europe issued restrictions
<br> <br> The meeting was held in the classroom Professor of Medicine Department of Ophthalmology, Keio University in Japan Ping Tin man a call. Representatives of prominent ophthalmologists, psychiatrists, electronic component researchers, European CIE (International Commission on Illumination), and LED manufacturers from related organizations and industries from around the world delivered speeches at the conference. Regrettably, people in the display industry did not give speeches, but the theme and content of the conference are worth listening to.

Basically, the author does not have medical expertise, and cannot explain in detail. Please forgive me. The Blu-ray problem is mainly in the following two aspects. The author also mentioned earlier that the human eye has two important functions of imaging and clock. First of all, if the eyes are overexposed to blue light, the eyeball may be damaged, which is an effect on the imaging function. Second, if the eyes keep watching the blue light day and night, it may cause abnormalities in the circadian rhythm (biological clock with a period of about one day), which is an effect on the clock function. This time, the society has focused on these two points and elucidated the Blu-ray problem from many angles. The purpose is to prevent the future from being left behind.

May affect the eyes of "imaging", "Clock" two functions
<br> <br> first talk about the effects of blue light on an imaging function in mice experiments show that if the eye over a long time exposed to blue light, can not deny lead to "old age "Macular degeneration" possibility. Age-related macular degeneration is a difficult disease and treatment trials using iPS cells have now begun. According to an ophthalmologist who gave a speech, the diameter of the part of the human retina that can be focused on imaging is only about 0.35mm. There is a substance called lutein on the macular area with a diameter of 1.5 to 2mm. The role of lutein is to block blue light and protect the retina, thus protecting eyesight. If you over-irradiate blue light, the macular area will be damaged and cause age-related macular degeneration.

Another speech pointed out that the lifespan of human eyeballs is about 50 years. Since the crystals begin to turn yellow from the age of 40, they can block blue light automatically. Therefore, there are more cases of cataracts in water crystals after the age of 40. On the contrary, young people's crystal clear, poor ability to block blue light, may be seriously affected by blue light.

Let's talk about the effect of blue light on the clock function. Blu-ray was originally an indispensable light for humans. The sun contains more blue light. Every day, the sun rises and the blue light shines. The human wakes up and starts to move. The sun sinks and the blue light disappears. The melatonin in the human body is reduced, and humans are induced to sleep.

However, in recent years, with the popularity of electronic products equipped with LED backlights and LED lighting, people’s eyes have been exposed to blue light day and night. This may disrupt the rhythm of life based on human body function (circadian rhythm).

Prof. Pingda of Keio University in Japan pointed out: "Recently, researchers have discovered a group of cells called the "third cell of vision" that has an absorption peak at blue wavelengths, and discovered that this cell controls circadian rhythms." Blu-ray is no problem, but it is not enough to continue to expose the blue light at night. If you continue to watch Blu-ray at night, "the body will mistakenly believe that it is still daytime."

Verifying the long-term impact of Blu-ray will take a long time, and now electronic product users have begun to wear anti-Blu-ray glasses. Prof. Sliney from the Johns Hopkins University in the United States pointed out at the conference: “Although it is not a hard requirement to wear anti-blue light glasses at present, there is no reason to deny that users are equipped with anti-blue light glasses for insurance purposes.”

Europe's preparation to introduce restrictions on LED researchers' speeches is also thought-provoking. Hunt, a professor at the University of California, USA, pointed out that if the luminous efficiency of white LEDs is always improved in the current way, the brightness of the blue part will be increased. LED manufacturers have stated that as a technology to solve this problem, LEDs with a spectrum close to sunlight are being developed.

Standing on the limit of Blu-ray, European CIE stated that the blue light of LED lamps will be graded in the near future. After answering the reporter's question after the CIE speech, the reporter asked: "Smart phones and TVs will also take such measures?" CIE responded that "is considering." CIE plans to first implement a blue light limit for fast-spread LED lighting. In the future, Blu-ray will be limited to all electronic products.

Later, NHK Osaka TV broadcasted an album about Blu-ray. The program introduced that the German Industrial Standard (DIN) has introduced the Blu-ray standard for LED lighting. According to the standard, experiments are being conducted in classrooms in universities to emphasize blue light during the day and reduce blue light at night. Students participating in the experiment rated it highly. The program also introduced Japanese universities that are conducting similar experiments, but the professor who promoted the experiment called for public agencies to promote research. “Even if it is beneficial to humans, it cannot be promoted without scientific basis in Japan.”

From this program, you can feel the attitude of Japan and Europe and the United States on the Blu-ray problem. However, what the author wants to emphasize is that the International Society does not support negative thinking such as “Because of this, then return to the era of light bulbs”. Instead, it is discussed in the positive direction of “having problems to solve”.

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