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战斗力 鹅
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注册时间 2006-8-19
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首先要搞明白眼疲劳跟辐射没有任何显著的关系，看书也会看瞎眼，难道书也有辐射？
跟眼疲劳有关的是亮度，聚焦清晰度，周围环境，字体，个人体质和用眼习惯
战LCD辐射的，懒得说，自己看，不相信的自己去google lcd emission
Q
How do various types of computer monitors compare in terms of radiation emission? Is it fair to assume that flat panel (LCD) type screens are \"safer\" in this regard than traditional cathode ray tube (CRT) monitors? Are there products available that effectively mitigate this concern and are practical? How does all this apply to smaller children who are using computers earlier and earlier in life?
A
The short answer is that as far as we know, all types of video monitors being sold in the United States are safe for adults and small children in that they do not emit any hazardous radiation under normal operating conditions. None can be said to be \"safer\" than others in terms of radiation emissions, based on any of the evidence we have today.
However, there are several different types of video monitors and they have different emissions and different potential emissions. The only potential emission from any of them that we know may be hazardous is x radiation from CRT-type monitors. It is fair to say that flat-panel LCD monitors will not emit x radiation under any operating condition whereas CRT monitors have the potential for emitting x radiation if the high voltage is raised higher than the CRT is designed to operate at. One might be able to cause a CRT monitor to emit some x radiation by failing a circuit or component, such as the hold-down safety circuit, and misadjusting user and service controls to raise the high voltage. But the manufacturers of CRT video monitors who sell their monitors in the United States are required to test their designs and certify that they will not emit significant x radiation (more than 0.5 mR/hr) with any one component or circuit failure and all the controls adjusted to maximize x radiation. That is required by the US Federal Performance Standard for Television Receivers administered by the Food and Drug Administration of the Department of Health and Human Services. The manufacturer of a CRT monitor is required to affix a label to its product certifying that it complies with the standard if he wants to sell it in the United States. LCD monitors and Plasma monitors are not considered subject to the standard because they have no potential for emitting x radiation.
Still, as electronic products, all video monitors emit a spectrum of radiation. They all emit light; they have to for people to see the picture but that is not hazardous at the levels emitted. They all emit some RF (radio frequency) radiation from oscillator circuits. That is not hazardous to people in almost all situations but it has the potential for interfering with other electronic circuits which is why people are required to turn off such devices when taking off or landing in an airplane. Any of them that operate off the home electrical power emit some ELF (extremely low frequency) but the scientific studies to date generally indicate that is not hazardous at the levels emitted. Concerning smaller children, none of the radiations emitted by any normally operating video monitor are believed to be hazardous to them.
Edward F. Dawson
Center for Devices and Radiological Health
US Food and Drug Administration |
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发表于 2007-5-15 12:26
发表于 2007-5-15 14:33