Osram launches small RGB multi-chip LED

Osram Opto Semiconductors has developed a small RGB multi-chip LED, for high-resolution full-colour video screens with large diagonals and small viewing distances.

The RGB multi-chip LED takes up an area of 1.6mm x 1.6mm and is 0.9mm high.

With this LED it is possible to have a pixel spacing of only 2mm, so that a large number of pixels can be provided in a small area.

A 2.5m x 4m display achieves a system luminance of 1,500-2,500cd/m.

This corresponds to around 10 times the luminance of a conventional LCD TFT screen.

Perfect colour mixing takes place in the package itself, thanks to the specially developed encapsulation material.

Colour appearance remains constant across the entire viewing angle, and the picture appears vibrant even when viewed from the side.

Ambient light cannot ruin the picture quality because it is barely reflected at all by the black package in which the LED is housed.

Inside the multi-chip LED there is a red chip, a blue chip and a green chip in Thinfilm and ThinGaN technology.

If the RGB-LED is operated with a current of 20mA, the individual chips 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.

The beam angle of the LED is +/-60deg.

Back to top