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.