Kabushiki Kaisha Toyota Jidoshokki

Tetsuya Utsumi, Deceased

Masayuki Harada

Tomoko Utsumi, Legal Representative

Mari Funada

Masaaki Arima

In a bottom emission type light-emitting apparatus, a face of a substrate, which is opposite from a light-emitting device, 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 the light-emitting layer and no more than two hundred times the longest wavelength. The arithmetic mean slope &#x394;a of the uneven surface is in a range between 3&#xb0; and 20&#xb0;, inclusive. Therefore, the apparatus substantially has higher extraction efficiency and a higher brightness in a specific direction.

Light-emitting apparatus and method for forming the same

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 &#x394;a of the uneven surface is in a range between 4&#xb0; and 30&#xb0;, 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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Kariya, Japan

Tetsuya Utsumi, Deceased