Article Abstracts | October 2007
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LEDs in High-Definition Television
Innovations in materials and packaging have increased brightness to the point where LEDs are now used in television displays.
by D.J. Segler, Texas Instruments
Recent improvements in light output have enabled new applications for LEDs such as automotive lighting, traffic signals and, more recently, television displays. Improvements in manufacturing the epitaxial material and packaging have enhanced thermal conductivity and increased the overall light extraction efficiency of LEDs (Figure 1). Quantum efficiency gains and unique photon-extraction techniques also have helped improve brightness.
Significant improvements in producing AlInGaP and InGaN structures have enhanced brightness, specifically in green and blue LEDs. Colors such as amber and cyan also are being developed, and all will lead to better color fidelity at a brightness nearly equivalent to that of common lamp-based technologies but with longer lifetimes. Additional performance enhancements include system-level features such as being mercury-free, turning on instantly, not producing sequential color artifacts, having adjustable brightness and exhibiting improved color gamuts (Figure 2)...
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