Polycarbonate is an excellent plastic for display filters. The material provides high impact resistance combined with an excellent flammability rating unlike acrylic. In terms of clarity polycarbonate is comparable to glass, but being a much lighter substrate polycarbonate is more suitable for applications where weight is an important consideration.
Optical filter's polycarbonate sheets are available in a range of thickness and surface finishes. Our CNC cutting facility will machine steps, holes with threads and grooves to strict tolerances.
Because polycarbonate is easily scratched due to softness Optical Filters recommends that polycarbonate filters are specified with a clear hard coating to front surface and preferable to both sides. This coating provides a high level of chemical resistance whilst eliminates the risk of scratches occurring through general handling of the product.
Non-glare hard coating
This coating provides the benefits of a non-scratch coating combined with a dispersive non-glare finish to reduce reflections in conditions where bright sunlight or overhead lighting may reduce the readability of a display.
Anti-reflective coating
Very low surface reflectance is achieved via multiply vacuum deposition layers process resulting in the surface being almost invisible. The coating also includes a clear hard coating and a finger print resistance layer.
Colours
Coloured polycarbonate sheets can provide effective contrast enhancement for coloured displays. Typical applications are LED, Vacuum Fluorescent and Electro-luminescent displays, where the filter accentuates the colour of the emitted light, making the back of the display appear darker. Solid material is limited in thickness and available colours but Optical filters can offer laminated material with a colour tinted interlayer.
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