Computer monitors with extremely low electromagnetic emissions

Here are our modified LCD monitors with extremely low electromagnetic emissions.

These monitors have the same picture quality of the best commercial monitors but internally they have been modified to avoid all the electromagnetic emissions that come from the backlight lamps and cables and the monitor's main electronic board.

A low emission monitor is aimed especially to sensitive users but everyone who uses a computer, for work or hobby, for more than one hour a day would get great benefits from removing the electromagnetic emissions from the monitor.

This monitor is recommended to CAD designers, designers, writers, drawers, programmers, software developers, video technicians, researchers and all people who need computer monitors without electromagnetic emissions.

This monitor is a good solution also for those special applications that need a monitor with extremely low electromagnetic emissions, like in some scientific researches.

Currently we make these monitors by modifying used LCD monitors, we can modify LCD monitors of any size.

What is the difference in these monitors

The exterior of these monitors is exactly like any other commercial LCD monitor but internally they are very different from common monitors.

The CCFL (Cold Cathode Fluorescent Lamp) LCD backlight has been replaced with a set of white LEDs designed for this purpose. The internal inverter and power supply have been completely removed. The monitor's main electronic board has been moved away from the monitor's container and put in a shielded box, connected to the display by means of a low voltage signal cable.

The electric power for the LED backlight is supplied by a small power supply with very low noise. The large current required by the LCD module and controller is provided by a special power supply with very low noise too.

Such modified monitors have also a much lower energy consumption, the power drawn from the mains is about 15 W or less.

Comparisons with other solutions

In the past years we've seen many proposals of gadgets that promised the cancellation of electromagnetic fields emitted from computer monitors: there was who was trying to sell you an amulet, "rare earth crystals", pendants,... of course that things have small or no effect.

Some small company provided LCD monitors modified internally with MuMetal sheet to shield the magnetic field.

Our solution is much better because we have removed the sources of electromagnetic emissions.

In this monitor the circuits and cables that create the strong electromagnetic fields have been removed completely, and a special power supply with very low electromagnetic noise is used.

Several people from all over the world have tried to modify a desktop LCD monitor to reduce its electromagnetic emissions. Some people tried to shield the internal parts with one or more layers of metal foil, using also different metals with different electromagnetic properties.

In our opinion the shield is far from being enough, because the emissions coming from the controller board are so strong that a little of them always passes through such thin shield. In addition the CCFL lamps are impossible to shield because they are directly attached to the light diffuser behind the TFT panel. Finally, even if the front of the monitor is closed with transparent conductive shield the shield is not completely closed around the monitor because that materials have a little shielding effectiveness.

Our solution is much better because we have removed the electronic circuits not just the internal power supply but also the inverter, the CCFLs tubes and wires, and the controller board. No one other than LowEMFOffice has removed all the removable electronic parts from the monitor. To achieve this result we use custom designed LED lamps and custom built signal cables.

Availability

Currently we can build a reduced EMF emissions display only by modifying a commercial LCD monitor, because the big industries do not sell LCD modules directly to small buyers, or they sell at a much higher price than the price of a complete monitor at the shop, and anyway buying just an LCD module would be a waste of money because the LCD module has to be opened to remove the CCFL and the CCFL are discarded.

Each monitor is a bit different from the others so the LED lamp has to be build accordingly, and LCD modules with embedded LED backlight are not very common yet.

We can transform your old LCD monitor, however for a complete transformation the components must have some kind of detachable connectors, the very old monitors contain a larger and more fragile type of connectors so they can't be modified.

If you would like to have a monitor with extremely low level of EMF emissions, contact us.

Some modified monitors

The following are two examples of modified LCD monitors that we currently use in our office, several other modified LCD monitors are under construction and will be finished soon. Click the pictures to see more details of each monitor.

	Low EMF LCD monitor built from an HP 1702. Size 17". Resolution up to 1280 x 1024. VGA input.
	Low EMF LCD monitor built from an Acer AL1716. Size 17". Resolution up to 1280 x 1024. VGA input.

Read more about the arrangement of this modified monitors
Read more about LCD monitor emissions.