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Additional resources for Developments in LEDs for Lighting
Mobile telephone flash units are hand-held appliances, but do not use back lighting. These hand-held applications are hidden to the consumer because the LEDs are internal to the equipment used. 5–3in on the diagonal, in a market that grew more rapidly than expected during the last year because more mobile phones (both high and low end) were sold than had been forecast. Mobile phone sales had been robust up to about mid-2006, but weaker mobile phone sales have been forecast for the second half of 2006 and 2007 in some quarters, with correspondingly weaker LED sales expected for the same period.
Prototype headlamp units have been demonstrated by such companies as Hella KG Hueck and Co. in Germany, Koito in Japan and Visteon Corporation in the US. Premarket concept models have been exhibited by auto manufacturers such as Audi, Cadillac, Ford and Mitsubishi. As stated earlier, the use of front running lights in the daytime reduced accidents by about 20% and front running lights have been gradually introduced on new models. As the LED has increased output power it has become an ideal candidate for running lights and could be the first white LED front application to be adopted.
The large displays will add substantial growth in the future because they require many LEDs per display. For the large LED powered LCDs, side-by-side comparisons with other technologies show obvious improvement in definition and colour rendition and really enhance customer appeal for these models. Side emitting LEDs have also been introduced to improve display uniformity and form factors. The benefits from LED backlighting over the compact fluorescent systems are no colour filter required, thinner and smaller volume lighting systems, an obvious higher definition quality to the observer and improved colour rendition.