Colored
Filters
Applications for colored optical filters include
contrast enhancement for monchrome displays (i.e., VF, EL, LED's)
via a color selective bandpass aligned with the peak output of the
display. Long pass filters are used to improve contrast and performance
of optical scanners and red, yellow and amber LED's. Neutral density and triple notch
filters and polarizers improve contrast LCDs by attenuating internal reflections and producing
a greater delta between the display's output and background.
Contrast Enhancement:
Neutral Density Optical Filters (Grays &
Bronzes)
Long Pass Optical Filters (Yellows, Ambers, Reds)
Band Pass Optical Filters (Blues & Greens)
Custom Colored Optical Filters (Triple Notch Filters)
Polarizers (Linear & Circular)
Band Rejection:
Visual Rejection Near IR Pass Filters
IR Rejection Heat Reflectors
Night Vision Compatibility Filters
Dontech colored filters are made with optical
substrates including acrylic, polycarbonate, and glass. The coloring
is produced by bulk loading the substrates with absorptive materials
materials or by depositing a thin film coating that passes or
rejects specific wavelengths of the visible, infrared or near
infrared spectrum.
Dontech manufactures custom colored filters utilizing many standard
and custom colors and substrates.
For additional information on colored filters and some standard
or typical transmittance data, please contact
a Dontech applications engineer, or request that a hard copy of
the Windows Design Guide be sent to you.
