Hereunder is some information on the types of filters that we recommend for different display types.

Electro-Luminescent Displays
These are one-colour bright displays. EMI can radiate from the electronics behind the display. On sensitive devices the display needs to be shielded.
Plastic or glass windows can be used. Moiré fringing is not an issue on these displays so the mesh can be set at 90° 

A circular polariser is usually included in the laminate to eliminate reflections from the metal components of the display

LCDs

This is a pixel based display with electro-magnetic interference emanating from the electronic circuitry itself. Whilst much of this electro-magnetic interference can be controlled at the board level, it some cases it may be necessary to shield the whole appliance, including putting a shielded window over the display aperture.
There are two options for shielding these displays: conductive coatings and wire mesh windows.

The choice of shielding element is a balance between the optical and shielding performance required. Wire meshes, whilst providing a higher level of shielding effectiveness, may cause Moiré fringing. This is the black and white moving pattern caused by a mismatch between the open area of the mesh and the pixel structure of the display. This can be controlled by rotating the mesh to find the optimum angle or by using an EmiClare mesh. 

PDPs
This is the only display type where the emi emanates from the display itself and not the circuitry. It is therefore essential that the window area is shielded as the interference can not be controlled at board level.
Issues for consideration are:

	Light transmission
	Shielding to Class B EN5044:1
	Near Infra-red blocking when remote control devices are used.
	Surface reflections
	Cost

Up until recently manufactures of PDP displays had ruled out mesh windows as being too dark and causing too much distortion. They had therefore settled for ITO coatings that were unable to offer the shielding requirements that were expected of a PDP for domestic use.

EmiClare(tm) PDP is a cost-effective solution that has overcome all of the problems associated with shielding these displays and offers a high light transmission, with more than sufficient shielding and excellent optics. If required these windows can also incorporate NIR blocking.

LEDs
These are usually one colour displays. They can be bright and there is usually a requirement for contrast enhancement. Using a coloured filter or neutral density filter will enhance the actual LEDs whilst attenuating the other colours and making the back of the display appear darker.

EmiClare GP70 provides suitable shielding for this display.

CRTs
Most CRT displays are produced with a fine etched surface. Using a filter with a non-glare surface (another etched surface) produces a coloured sparkling effect when viewing the CRT through this filter. This can be dealt with by moving the filter further away from the CRT or by changing to an anti-reflective optical coating.

For office or bank use where confidentiality is an issue, a privacy film can be included in the laminate. This controls the viewing angle of the display.

Touchscreens - click here for detailed information.
Touchscreens are now being used in a wide range of applications from offices to ATMs, Public Information displays to gaming machines. Given the nature of these applications, these screens are often treated roughly and it is therefore important that they provide a reasonable level of impact resistance and safety. If they were to break, the screen should remain intact, thus avoiding damage to the equipment and to persons from broken glass.

Security Glass
Full lamination of the sensor glass with another piece of glass or plastic can enhance the overall strength and safety of the screen without impairing the optical clarity of the display. 

Privacy filters
Touchscreens are being increasingly used on ATM machines where privacy is an important consideration. Light control films such as 3M privacy filters, can be used to control the angle from which the display can be viewed.