Light-emitting apparatus and method for forming the same

Details Light-emitting apparatus and method for forming the same Light-emitting apparatus and method for forming the same

2006-07-04

2006-07-04

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S498000, C428S140000

Reexamination Certificate

active

07071617

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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Filed May 13, 2004, Tetsuya Utsumi (deceased); Masaaki Arima; Masayuki Harada and Mari Funada.

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