Tiny Three-Color LED Chip Makes Large Video Screens

The RGB Multi ChipLED enables high-resolution, full-color video screens to offer brilliant colors and high contrast from all viewing angles. The chip’s small dimensions—1.6 by 1.6 mm by 0.9 mm high—allow a large number of pixels in a small display area, with pixel spacing as close as 2 mm. The black housing reflects almost no ambient light, which also improves picture quality. The Multi ChipLED houses a red chip, green chip, and blue chip fabricated using the company’s ThinFilm and ThinGaN technology. Color mixing takes place inside the chip’s package using the specially developed encapsulation material. The LED’s viewing angle is ±60°. If the RGB-LED runs with a 20-mA current, the individual devices produce typical luminous intensities of 250 mcd (red), 350 mcd (green), and 70 mcd (blue). Typical efficiency at this intensity is 4 cd/W, which corresponds to a luminous efficiency of 12 lm/W. OSRAM OPTO SEMICONDUCTORS, Sunnyvale, CA. (888) 446-7726.