LED-driven backlights for automotive displays

Frank Strauch

doi:10.1117/12.776891

28 September 2007 LED-driven backlights for automotive displays

Frank Strauch

Proceedings Volume 6797, Manufacturing LEDs for Lighting and Displays; 67970Y (2007) https://doi.org/10.1117/12.776891
Event: Manufacturing LEDs for Lighting and Display, 2007, Berlin, Germany

Abstract

As a light source the LED has some advantage over the traditionally used fluorescence tube such as longer life or lower space consumption. Consequently customers are asking for the LED lighting design in their products. We introduced in a company owned backlight the white LED technology. This step opens the possibility to have access to the components in the display market. Instead of having a finalized display product which needs to be integrated in the head unit of a car we assemble the backlight, the glass, own electronics and the housing. A major advantage of this concept is the better control of the heat flow generated by the LEDs to the outer side because only a common housing is used for all the components. Also the requirement for slim products can be fulfilled. As always a new technology doesn't come with advantages only. An LED represents a point source compared to the well-known tube thus requiring a mixing zone for the multiple point sources when they enter a light guide. This zone can't be used in displays because of the lack of homogeneity. It's a design goal to minimize this zone which can be helped by the right choice of the LED in terms of slimness. A step ahead is the implementation of RGB LEDs because of their higher color rendering abilities. This allows for the control of the chromaticity point under temperature change but as a drawback needs a larger mixing zone.

Citation Download Citation

Frank Strauch "LED-driven backlights for automotive displays", Proc. SPIE 6797, Manufacturing LEDs for Lighting and Displays, 67970Y (28 September 2007); https://doi.org/10.1117/12.776891

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KEYWORDS

Light emitting diodes

LCDs

Glasses

Waveguides

LED backlight

LED displays

LED lighting

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