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Osram`s efficient LEDs offer constant display backlighting

The firm's III-nitride MicroSideled 3806 offers 15,000 hours of constant output for portable device displays
Osram has introduced a new LED which is ideally suited to mobile display applications.

Even at high temperatures and high currents Osram Opto Semiconductors says its MicroSideled 3806 ensures stable light conditions on the display.

The brightness of this LED, which is available in white and blue, remains constant throughout its lifetime. And Osram says its colour rendering leaves nothing to be desired. The devices also have an impressive efficiency so these semiconductor light sources are ideal for portable devices such as tablets and smartphones.

MicroSideled 3806

Multifunctional devices such as tablets, ultrabooks and smartphones need high brightness levels and good colour rendering without draining the batteries too quickly. The MicroSideled 3806 has been designed specifically to meet these requirements.

Osram says the LED is very efficient in white and blue, offers constant brightness throughout its lifetime of 15,000 hours and can withstand high temperatures and high currents. At the end of its rated life it does not simply go dark. At this time, half of the LEDs will still provide 70 percent of their initial brightness (L70/ B50).

With impressive luminous efficacy and external quantum efficiency, the white version is a classic LED with chip and converter, achieving an efficiency of 150 lumen/watt (lm/W).

Matthias Winter, Marketing Director Consumer at Osram Opto Semiconductors mentions another benefit. He says, “For white in particular we offer very fine binning so there is always a uniform colour over the entire backlit surface.”

The efficiency of the blue MicroSideled is 55 percent, measured as the external quantum efficiency (EQE), in other words the ratio of the electrical power used to the emitted optical power.

This LED is designed for special display technology that uses quantum dots (special nano particles) as conversion material. This conversion technology features a thin sheet with quantum dots (the quantum dot sheet) in the backlighting. This sheet is illuminated by the blue LEDs. This in turn leads to an extremely narrow-band emission spectrum which accurately hits the colour filters of the backlighting unit.

Tablets, ultrabooks and smartphones benefit from these robust LEDs because they offer constant brightness throughout their entire lives and extend battery life thanks to their high efficiency (Picture: Osram)

Light losses are therefore kept to a minimum and the colours are more vibrant. System efficiency with this conversion technology is 10 to 15 percent greater than with classic white LED solutions. Coverage of the colour space is also 33 percent better than with classic white LED systems.

Both versions are compact, measuring only 3.8 x 1.0 x 0.6 mm (length x width x height), and have good thermal conductivity with a thermal resistance of 66 K/W.

“The new MicroSideled offers extraordinarily high efficiency, constant brightness and brilliant colour rendering, irrespective of which technology is used to create white light,” is how Matthias Winter sums it up.

Technical data:

Osram says thanks to its excellent efficiency, the MicroSideled is the ideal energy saver for portable devices.

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