How much transmittance loss can be expected when adding an EMI/RFI shielding filter to my display or touch screen?
Luminance or transmittance loss depends on the type of optical EMI/RFI shielding, as well as the optical substrates used. For transparent conductive coatings on glass, unenhanced ITO at 10 ohms/sq will have photopic transmission of roughly 85%. By adding a dielectric (antireflective coating) enhancement to both sides of the glass, transmission can be improved to over 92%. This is approximately the transmission of clear glass. Consequently, transparent conductive coatings can be used for a variety of EMI/RFI shielding applications while preserving virtually 100% of the display’s contrast and luminance.
