Switching from CCFL to LED backlighting

摘要

As lighting topologies have advanced, backlighting technologies have evolved to keep pace. At one time, cold-cathode fluorescent lamps (CCFLs) were the dominant technology for backlighting active-matrix thin-film transistor (TFT) LCDs and were powered by dc/ac inverters. Now, LED backlights have taken over. Their advantages over CCFL have been well documented - higher brightness, longer lifetime, lower power consumption, and no mercury, to name a few. The rising prominence of LED backlights (see Fig. 1), usually in the form of rails, strings or LED arrays, has presented many manufacturers and users of display power supplies with a number of options.