Light-emitting apparatus and method for forming the same

a technology of light-emitting apparatus and light-emitting device, which is applied in the direction of discharge tube/lamp details, luminescnet screen, discharge tube/lamp details, etc., can solve the problems of low extraction efficiency of light-emitting apparatus, uneven surface of light-emitting device, and specular reflection of external light, so as to prevent specular reflection and high brightness
US20060186806A1Inactive Publication Date: 2006-08-24UTSUMI TETSUYA +3
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
UTSUMI TETSUYA
Publication Date
2006-08-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

In a light-emitting apparatus, a face of a substrate on which a light-emitting device is formed is an uneven surface having a plurality of asperities. The mean spacing Sm of adjacent asperities or the mean spacing S of peaks of adjacent projections of the asperities is no less than three times the longest wavelength of light generated by a light-emitting layer and no more than two hundred times the longest wavelength. The arithmetic mean slope Δa of the uneven surface is in a range between 4° and 30°, inclusive. Therefore, the apparatus emits substantially a greater amount of light from a light extraction side and has less brightness unevenness than a light-emitting apparatus with no uneven surface.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a divisional of U.S. patent application Ser. No. 10 / 844,923 filed on May 13, 2004. The entirety of these priority applications is hereby incorporated in toto by reference.BACKGROUND OF THE INVENTION

[0002] The present invention relates to a light-emitting apparatus having a substrate on which a light-emitting device is formed. The light-emitting device is an organic electroluminescent device (organic EL device) or an inorganic electroluminescent element (inorganic EL elements). Such a device has a light-emitting layer held between a pair of electrodes. The present invention also pertains to a method for forming the apparatus.

[0003] Lighting systems and displays using a light-emitting apparatus such as an organic electroluminescent apparatus (organic EL apparatus) and an inorganic electroluminescent apparatus (inorganic EL apparatus) have been proposed.

[0004] Such light-emitting apparatuses are known for low extract...

Claims

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