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

1998-04-13

2000-07-18

Patel, Ashok

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

313111, 313478, H01J 516, H01J 6140, H01K 126, H01K 130

Patent

active

060911840

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.

REFERENCES:
patent: 3708622 (1973-01-01), Brown, Jr. et al.
patent: 5060075 (1991-10-01), Skinner
patent: 5076674 (1991-12-01), Lynam
patent: 5157540 (1992-10-01), Kidai et al.
patent: 5534748 (1996-07-01), Oomen
patent: 5652477 (1997-07-01), Tong et al.
patent: 5694001 (1997-12-01), Wielstra
patent: 5874801 (1999-02-01), Kobayashi et al.

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