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High-power LEDs target automotive HUDs

Posted: 23 Jul 2015     Print Version  Bookmark and Share

Keywords:Osram Opto Semiconductors  LED  TFT display  HUD  head-up display 

Osram Opto Semiconductors has announced a high-power LED with a colour coordinate that has been specially matched to TFT displays and the relevant white point requirements. The high-power Oslon Compact CL has a ceramic converter that ensures that the colour locus remains constant even at high temperatures.

When it comes to automotive HMIs, head-up displays (HUDs) are, despite isolated criticism, regarded as a technology of the future. A ceramic converter ensures that the colour locus remains constant even at high temperatures. With an extremely compact footprint of just 1mm2, this light source is ideal for use in head-up displays.

Oslon Compact CL

HUDs offer many significant advantages for car users. Drivers are less distracted and therefore enjoy greater safety. Relevant information such as current speed, warnings, satnav instructions and infotainment data appear directly in the field of vision. Drivers can therefore keep their eye on the road and at the same time receive important information.

The quality of a HUD depends largely on the light source used. TFT displays typically use white LEDs as the light source offer impressive performance, with full-colour display and excellent contrast. The Oslon Compact CL chip has a number of properties that make it ideal for use in HUDs. It's extremely compact package measures only 1.9mm x 1.5mm x 0.75mm so the LED can be arranged very close to the TFT display (< 100m). This results not only in high efficiency and excellent optical characteristics but also in a small mounting depth, which is a great advantage in the cramped interior of vehicles.

The colour coordinate in the colour triangle is cx 0.28/cy 0.25, producing a slightly bluish white. TFT displays filter out the blue component, leaving a pure white from which the entire colour spectrum can be generated. As a ceramic component, the Oslon Compact CL has only a small thermal resistance of 8K/W. The resultant heat is quickly dissipated and the colour coordinate remains constant even at high temperatures. There are no colour shifts, and the colour appearance is excellent.

As a Lambertian radiator, the Oslon Compact CL has an emission angle of 120 degrees. It can be used as a single light source or in tight cluster arrangements of 1 x 2, 2 x 2, 2 x 3 or 2 x 4 LEDs. This means that different lumen packages can be provided and different brightness requirements can be met. The typical luminous flux of a single LED is 260lm at an operating current of 1A, and 350lm at 1.5A. With these high light outputs the Oslon Compact CL is also fit for the next generation of HUDs that will provide even more information (augmented reality) in the drivers' field of vision.

- Christoph Hammerschmidt
  EE Times Europe

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