News

15 May 2009

 

Osram claims smallest RGB LED, targeting high-res full-color video screens

Osram Opto Semiconductors GmbH of Regensburg, Germany has developed the smallest member of its RGB Multi ChipLED family, bringing what it claims is a new dimension of high-definition picture quality to large full-color video screens.

The RGB Multi ChipLED’s package measures 1.6mm x 1.6mm and just 0.9mm high, so a pixel spacing of only 2mm is possible and many pixels can be accommodated in a very small area: less than 10m is sufficient to display pictures in HDTV quality and accommodate more than 2 million pixels. A 2.5m x 4.0m (98” x 157”) display that is 10m (394”) in diagonal can achieve a system luminance of 1500-2500cd/m², corresponding to about ten times the luminance of a conventional LED-backlit TFT LCD screen.

All this enables high-resolution full-color video screens (e.g. in TV studios, conference rooms, trade fairs and concert halls) to offer brilliant colors and high contrast from all viewing angles, helped by the LED being housed in a black package that reflects hardly any ambient light, the firm says.

Also, thanks to the specially developed encapsulation material, perfect color mixing in the package itself means that color appearance remains constant across the entire viewing angle, and the picture appears vibrant even when viewed off-axis. The LED’s beam angle is ±60°.

If the RGB-LED is operated with a current of 20 mA, the individual red, blue and green chips (fabricated using Osram’s ThinFilm and ThinGaN technology) produce typical luminous intensities of 250mcd (red), 350mcd (green) and 70mcd (blue). The typical efficiency of this luminous intensity is 4cd/W, which corresponds to a luminous efficacy of 12lm/W.

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