Personal computers are great tools for office activities, for Internet activities and many other uses, but they have a big drawback: the monitor is still an electronic device and creates electromagnetic fields, or rsdiation, of many kinds that are unhealthy。
From the beginning of the "computer revolution", about 1995, we have seen the gradual replacement of CRT (Cathode Ray Tube) monitors with LCD (Liquid Crystal Display) ones with a few improvements but not so many。
A CRT monitor creates a strong magnetic field all around itself, and radiates low frequency waves that are almost impossible to shield.
An LCD monitor doesn't generate a strong magnetic field, however both the backlight system and the other circuits emit lots of electromagnetic fields of various frequency bands.
The electromagnetic fields are completely invisible and this fact has many consequences on the way people and society behave and consider them.
The effects of electromagnetic fields are of course variable from an individual to another.
In work environments, in schools, and everywhere a group of people is using together a computer display, most of the people aren't aware of the electromagnetic radiation that are coming from the device, so when symptoms of electromagnetic stress start to appear they blame completely different things for that.
Doctors that should care about our health have almost no knowledge of the effects of electromagnetic radiation to our body. They give prescriptions for some pills or other chemical products that don't change anything in the environment, and people gets further health loss from medicines in addition to that from the electromagnetic radiation.
We can suspect that there are some doctors who know that electromagnetic radiation are the only cause of the illness of their patients, but they still don't tell a thing, and give prescriptions for medicines or painkillers, perhaps because they are paid by the pharmaceitical companies。
Of course not all doctors are so bad, there are a few doctors that are publicly asserting the harmful effects of many types of electromagnetic radiation.
But if there is this negative subproduct of the device, why the industry hasn't done anything to stop it ? The reasons are many and complex: industries, like nations, aren't real entities that can see and touch, and feel pain, they are complex organizations where thousands of people do something for receiving a salary or bonus, and the result is that products are never tested for enough time to see these problems。
On the other hand single users, expecially who works on software or web site development, use the computer monitor for many hours each day so they can notice the naughty effects of the electromagnetic emissions of monitors on physical health.
Of course industry managers are looking for profits and market shares and do not think to it twice if they have a chance to sell something to millions of people, making billions of dollars, even if the device they are selling is polluting and dangerous, as long as the product doesn't kill or harm people evidently and in short time.
Even if industry managers had respect for human health and decided to avoid all electromagnetic emissions from such an important device as the computer monitor, there are many technical problems as we can see.
Every electrical and electronic circuit generates electromagnetic field around it, and once the fields are produced it is very difficult to contain them.
We've been researching for more than a decade the ways to reduce unwanted electromagnetic emissions from computer monitors, and we have collected many techniques that give good results.
Today it is possible to build computer monitors with very, very low electromagnetic emissions, but industries still don't make them, why ? If it is possible to avoid these harmful emanations, why don't they do this ?
The reasons are always the same: organizations are slow and bloated, and profit interests have the precedence。
Very large, enormous, factories have been built to produce LCD modules and displays by machine。 Automated factories cost millions or billions, and redesigning them requires much much work, time and money。