Heater / EMI 

Spectrum Displays offers custom transparent ITO coatings used as EMI/RFI suppression. These filter elements are designed with excellent transmission in the visible spectrum while minimizing internal reflections for use with TFT LCD assemblies. The viewing surfaces of the EMI / Heater assemblies can be enhanced with broadband anti-reflective coatings with very low levels of diffuse to maximize the contrast of the display assembly when used in high ambient lighting conditions. 

The cover glass can be coated with precisely controlled indexed matched layers of Indium Tin Oxide (ITO) to achieve very low resistive values per square inch while maintaining high transmission minimizing internal reflections when bonding in the final assembly. 

All filter elements include features such as silver frit bus bars and can be customized for unique termination in the final assembly. All of the coatings and bus bars are processed to be robust and resistant to chemicals, solvents, and cleaning fluids typically found in aircraft applications.

AR Heater (DIMITO) filters: 

• Specular reflectance (wet with black glass)
• : 0.25 ~ 0.50% (Depending on resistance)
• Surface resistance: 3 ~ 300 ? (wire to wire) 
• Glass size: Up to 24″ diagonal
• Buss Bars made with a silver frit firing process 
• Surface requirement: 80/50, 60/40, or 40/20
• Transmission: >93% (High ?), >90% (Low ?)
• Base glass: Soda-lime, Borosilicate, & others
• Dimension tolerance: +/- 0.005 ? +/-0.010 ?
• Soldering heater wire / Heater lead
• Black epoxy or frit on silver frit (Optional)

AR EMI (DIMITO) Filters: 

• Specular reflectance (wet with black glass)
• :  0.25 ~ 0.50% (Depending on resistance) 
• Surface resistance: 3 ~ 300 ?/sq.
• Glass size: Up to 24″ diagonal
• Silver frit & Black frit firing process
• Surface requirement: 80/50, 60/40, or 40/20
• Transmission: >93% (High ?), >90% (Low ?)
• Base glass: Soda-lime, Borosilicate, & others
• Dimension tolerance: +/- 0.005 ? +/-0.010?
• Black epoxy & Silver epoxy (Optional)
• CSG (Chemical Strengthen Glass) (Optional)

All of the display modules include enhancement options like custom AR over glass elements. These cover lens assemblies are specially designed to maximize display contrast and minimize reflective loss when used in high ambient lighting. These AR coatings are a broadband low reflection index-matched process typically found in aerospace applications. The AR coatings can be applied to a wide variety of glass substrates including soda-lime, white float, and strengthened glass elements. These cover lens assemblies are optically bonded in a clean room and meet the demands of aerospace applications.

Optical Bonding 

Optical Bonding increases TFT AMLCD view ability in high ambient lighting or direct sunlight applications. With index-matched AR, AG cover lens assemblies, or touch screens the optical bonding process improves contrast (Improved black and white levels) by reducing the reflective loss. Spectrum Displays offers a single point of supply for the complete display solution optically bonding of the filter to TFT modules is performed in a clean room environment using proprietary processes that have been developed specifically for displays used in rugged environments. We supply both high-volume low cost and small-production types of bonding for aerospace and defense applications. The optical bonding techniques have been rigorously tested in harsh military environments to insure the display optical stack will perform in a rugged application.