Definition
IR (infrared) and UV (ultraviolet) blocking filters for displays are optical films or coatings that absorb or reflect specific non-visible wavelengths while transmitting visible light. These filters protect both the display hardware and the end-user from harmful radiation, and in some applications prevent IR wavelengths from interfering with sensors or night-vision systems.
Why Displays Need IR/UV Protection
| Wavelength | Source | Problem Without Blocking |
|---|---|---|
| UV (280–400nm) | Sunlight, UV LEDs, fluorescent | Degrades LCD polarizers; fades colors over time |
| Near-IR (700–1000nm) | Sunlight, IR LEDs, heat | Heats components; interferes with IR sensors/cameras |
| Far-IR (1000nm+) | High-temperature environments | Thermal stress on electronics and adhesives |
Night Vision Compatibility (NVIS)
Military and aviation applications using night-vision goggles (NVGs) require displays to emit no light in the 625–930nm range — the spectral sensitivity of image intensifier tubes. Standard backlights are rich in this range. NVIS-compatible filters block these wavelengths to prevent NVG whiteout while maintaining display readability to the unaided eye.
UV Blocking for Display Longevity
UV radiation is the primary cause of color fading and polarizer degradation in outdoor and UV-exposed display installations. Museum displays, outdoor signage, and retail window displays exposed to UV can show visible yellowing, contrast loss, and color shift within months without protection. Display Logic’s UV blocking films provide 99%+ UV rejection while maintaining full visible light transmission.
Frequently Asked Questions
What is NVIS compatibility for displays?
NVIS (Night Vision Imaging System) compatibility means the display has been filtered to suppress emissions in the 625–930nm range that would overwhelm night-vision goggles. Display Logic supplies NVIS-compatible display filters meeting MIL-L-85762A requirements.
Do IR blocking filters affect display brightness?
Near-IR blocking filters have minimal impact on visible light transmission — typically less than 5% brightness reduction. Far-IR and UV blocking combined with visible-pass filters maintain full display luminance for the viewer.