Quantum dot technology delivers wide color gamut in large Screen LCD TV

This work reports a wide color gamut solution using quantum dot (QD) technology. Quantum dots are nano-crystal semiconductor material with a much narrower full width at half-maximum (FWHM) emission spectrum than that of phosphors. The emission wavelength of QD light can be tuned by varying its particle size to create almost any color desired. In this work, an edge-lit LED backlight is developed by combining a blue LED chip with green and red QDs. The QD materials are hermetically sealed inside an optical glass tube. A mixing cup is used to couple a blue LED light bar with the QD tube, providing mechanical spacing control, light recycling and mixing. By applying typical light guide plate and color filters of LCDs, a wide color gamut of 105% NTSC is attained on a 55” TV.