Display filter arrangements

Details Display filter arrangements Display filter arrangements

1992-06-12

1993-12-07

Lerner, Martin

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

359498, 359589, 359590, 358240, 358253, G02B 520, G02B 530

Patent

active

052687880

ABSTRACT:
A display especially for viewing by a night-vision aid has an array of LED's which emit green light. A dichroic filter is located in front of the display and transmits radiation at the peak emission of the diodes but reflects radiation in the range to which the night-vision aid is sensitive. A bandpass filter located in front of the dichroic filter prevents transmission of longer wavelengths, and a circularly polarizing filter in front of the bandpass filter prevents transmission of radiation reflected specularly from surfaces behind it.

REFERENCES:
patent: 4007396 (1977-02-01), Wisbey et al.
patent: 4515442 (1985-05-01), Aron
patent: 4747674 (1988-05-01), Butterfield et al.
patent: 4944579 (1990-07-01), Egan

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