Materion Balzers Optics
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UV-Guard™

High Performance UV-Blocking Filter for Projection Display Applications

Materion Balzers Optics UV-Guard™ filters are high performance blocking filters for ultraviolet and infrared radiation from high intensity arc lamps in projection display systems. The high level of blocking ensures stringent requirements on UV suppression for microdisplay panels and other optical components, whereas the optional IR blocking reduces the heat load on these components. The UV-Guard™ filters’ excellent transmission for visible light results in high brightness and neutral colors. UV-Guard™ filters are produced with Materion Balzers Optics’ patented sputtering deposition technology, providing very dense filter coatings with excellent optical stability both at higher operating temperatures and varying environmental conditions.

High Performance UV-Blocking Filter for Projection Display Applications

Benefits

  • Excellent UV-rejection and IR suppression with high transmission for visible light.
  • Narrow cut-on/cut-off edge tolerances (< ±1%)
  • Very steep cut-on slopes available
  • Excellent spectral uniformity and stability
  • Superior optical stability at higher operating temperatures (spectral stability < 1 nm/100 °C) and in varying humidity environment (< 0.5 nm shift)
  • Excellent mechanical properties (scratch resistant, adheson)
  • High volume production capabilities with consistent high quality.
  • Engineering support for custom designed UV-Guard™


Applications

UV-Guard™ filters are specially designed for the individual requirements in all major projection display system architectures: DLP®, tLCD and LCOS. Other application areas are in lighting and instrumentation.

Schematic of UV-Guard™

Technical Data

UV-Guard™ types available

UV-blocking filters with broadband RGB transmission

UV/IR blocking filters with broadband RGB transmission

UV/IR blocking filters with extended IR blocking ranges

UV-blocking filters optimized for blue channel in tLCD
architectures (high UV rejection, steep cut-on edge slope)


Typical performance* (AOI = 0°)


T = 50%

300–400 nm

440–680 nm

750–900 nm

20/80% slope

UV-Filter

420 ± 4 nm

T-avg < 0.5%

T-avg > 97%

n.a.

< 9 nm

UV/IR-Filter

420 ± 4 nm
700 ± 8 nm

T-avg < 0.5%

T-avg > 95%

T-avg < 2%

< 9 nm, < 24 nm

* other performance upon customer request.


Heat resistant

Surface quality

Environmental stability

Substrate material

heat resistant borosilicate glass

up to 400 °C

80/50 (typical)

according to MIL-14806C



Typical spectral curves of UV-Guard™ Filters and emission spectrum of typical UHP lamp

UV filter for DLP®
UV/IR filter for DLP®
UV/IR filter for tLCD/LCOS
UV/IR filter with extended IR blocking
UV filter for tLCD blue channel
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