Instrument Plastics’ range of Optolite Clear HSR optical grade filters offers a robust material that is resistant to high temperature, scratches and impact. It is especially suited to LCDs and other display applications where these characteristics are of a particular importance.
LCDs often suffer from problems such as a soft front surface polariser, which can be subject to damage from scratching, dirt, moisture, finger marks, etc, front surface reflections that can make it difficult to read the display in certain lighting conditions, and restricted viewing angles caused by LCD construction and method of operation.
In addition to this, LCDs often suffer from ultraviolet degradation in strong sunlight, shielding from electromagnetic interference must be mitigated, and sourcing of bezels is not always possible or feasible with so many different LCD sizes available.
Optolite Clear HSR (High Scratch Resistant) filters are designed to overcome these problems on LCDs. The material has both outstanding abrasion resistance – up to 20 times that of acrylics – and excellent impact resistance. It is also chemical-resistant, being immune to the effects of virtually all common solvents.
It is lightweight, approximately half that of glass, and exhibits optical properties comparable to crown glass. Its maximum continuous operating temperature is in excess of 100°C. The filters are available with selected optional cast-in, non-glare finishes to overcome front surface reflections. These finishes can improve readability, whilst offering advantages in that they cannot chip, peel or rub off.
Optolite Clear HSR is cast in-house down to 0,5 mm thickness for applications where maximum viewing angle is required or where space is at a premium. Thicker filters are manufactured for when impact resistance takes priority. Tight thickness tolerances are supplied for specialised applications.
An optional ultraviolet inhibitor is also available to restrict potentially harmful UV rays when certain displays are operated outdoors in strong sunlight conditions. A further option incorporates a blackened stainless-steel mesh for electromagnetic shielding; a full edge termination service is also available. These mesh filters typically give a protection of 60–70 dB over the frequency range of 100 kHz to 1 GHz.
In applications where bright LEDs cause ‘burnout’, or uneven illumination of a display, Optolite Diffusers soften the light and provide an even illumination.
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