Optical element and display device provided with said optical el

Details Optical element and display device provided with said optical el Optical element and display device provided with said optical el

1997-02-18

1999-01-12

Spyrou, Cassandra C.

Optical: systems and elements

Absorption filter

313478, 313479, 359277, G02B 522, G02F 101, H01J 3100

Patent

active

058597352

ABSTRACT:
An optical element (8) is provided on a substrate, for example a display screen (3) of a display device (1), which optical element comprises a light-transmitting layer whose transmission in the visible region varies in response to a change in ambient light. The optical element (8) is characterized in that it further comprises a colored coating which selectively absorbs light in the visible region. The colored coating has such an absorption characteristic that the color coordinates (x;y) of the combination of the light-transmitting layer and the colored coating vary in such a way, as a result of a variation in ambient light, that a line, which interconnects the color coordinates, is partly situated in an elliptical area with achromatic point (0.333;0.333) in the color triangle, which ellipse comprises a major axis and a minor axis, which major axis terminates in (0.30;0.28) and (0.36;0.38) and the eccentricity of which ranges between 2 and 3. Preferably, the line is situated predominantly in the elliptical area. The invention is important, in particular, for optical elements which serve to reduce the transmission of light, and which comprise an electrochromic element or a photochromic element.

REFERENCES:
patent: 4970431 (1990-11-01), Vegter et al.
patent: 5060075 (1991-10-01), Skinner
patent: 5539276 (1996-07-01), Exell et al.
patent: 5694001 (1997-12-01), Wielstra

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