23 August 1996 Ultrahigh-resolution emissive micromirror LETFEL displays for the injection of intelligent graticule information in avionic head-up display systems
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Abstract
Fixed legend light sources, manufactured using micro-mirror laterally emitting thin film electroluminescent (LETFEL) device technology, are suitable for avionic head-up display (HUD) systems. These devices utilize commercially accepted alternating current thin film electroluminescent device structures for internal light generation. However, light out-coupling occurs solely by the reflection of lateral light by micromirrors, whereas conventionally the emission occurs through transparent electrodes and substrates. The novel structure facilitates the use of black surface layers which maximize contrast ratio. LETFEL micro-fabrication processes, such as dry etching of Y2O3 and ZnS:Mn, define fixed legend symbology with feature sizes as small as 3 microns in width. Display contrast ratio is greater than 100:1, angular divergence is Lambertian and brightness can exceed 20,000 fL at 10 kHz sinusoidal excitation and 30 V above threshold. Extrapolated lifetimes of the structure exceed 10,000 hours with a reduction in brightness to 90% of initial readings. These ultra high resolution displays exceed specifications for avionic HUD systems operating in bright sunlight conditions.
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Robert Stevens, Robert Stevens, Abd. Hassan Abdullah, Abd. Hassan Abdullah, Wayne Cranton, Wayne Cranton, } "Ultrahigh-resolution emissive micromirror LETFEL displays for the injection of intelligent graticule information in avionic head-up display systems", Proc. SPIE 2774, Design and Engineering of Optical Systems, (23 August 1996); doi: 10.1117/12.246721; https://doi.org/10.1117/12.246721
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