Optical element and display device provided with said optical element
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 18, 2000
Grant Date -
N/A
app pub date -
Apr 13, 1998
filing date -
Apr 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The optical element (29) comprises a substrate (28) provided with a light-transmitting layer (20) whose transmission in the visible range varies in response to a variation in light. The optical element (29) is characterized in that an anti-reflective layer (21) is provided between the substrate (28) and the light-transmitting layer (20), the refractive index of said anti-reflective layer preferably ranging from 1.5 to 2.2. The light-transmitting layer (20) may further be provided, on a side of the light-transmitting layer (20) facing away from the substrate, with a further anti-reflective layer (22) having a refractive index which preferably ranges between 1.3 and 1.6. The light-transmitting layer may comprise an electrochromic element (20) as well as a photochromic element. The optical element (29) is preferably provided on the outside of the display window (28) of a display device.
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