Osram unveils colour LED

Osram Opto Semiconductors has developed the Advanced Power TopLED Plus, providing 15 per cent more light for direct display backlighting than standard Advanced Power TopLEDs.

Depending on the display, the LEDs in the usual combination of red (623nm), green (527nm) and blue (457nm) cover more than 125 per cent of the NTSC colour gamut and are suitable for all directly backlit displays, particularly for large-format LCDs in sizes of 24in diagonal and up.

The TopLED Plus offers an optimised display brightness-to-thickness ratio so that the minimum number of LEDs is required.

The improved brightness is made possible by a lens specially designed for backlighting.

At an operating current of 100mA, the LEDs achieve 14lm (red), 24lm (green) and 28 mW/sr (blue).

The wider viewing angle of the lens ensures absolutely uniform backlighting.

The chips used are 500 micrometres in size and are fabricated with the latest ThinGaN or Thinfilm technology for high efficiency: 65lm/W (red), 59lm/W (green) and 27 per cent overall efficiency (blue).

With a lifetime of more than 50,000 hours, the Advanced Power TopLED Plus is compatible with typical LCD lifespans.

The LED's low profile - 2.25mm high - enables the design and production of very thin backlights.

Osram's Advanced Power TopLED Plus is suitable for all display sizes.

The optimised brightness-to-thickness display ratio means that only 1,200 LEDs are needed to backlight a 24in diagonal LCD, compared with previous designs that required up to 1,800 LEDs to produce the same brightness.

Projects are already under way with key customers for use in 46in monitors.

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