device for reducing the impact of diffuse and specular reflections in a in a narrowband issuing ljuskella based presentationsorgan

摘要

PCT No. PCT/SE79/00172 Sec. 371 Date Apr. 15, 1980 Sec. 102(e) Date Mar. 20, 1980 PCT Filed Aug. 14, 1979 PCT Pub. No. WO80/00499 PCT Pub. Date Mar. 20, 1980.An arrangement for reducing influence of diffuse and direct reflections in a display device based on a light source emitting in a narrow band said display device comprising an absorption filter (25) having a pass band enclosing the center frequency of the light source (11) said absorption filter being placed in the beam path between the light source (11) and the observer (14) and immediately adjacent reflecting means (24), the bandwidth of the filter (25) being wider than the bandwidth of the light source (11), but considerably narrower than the spectral bandwidth of the eye.