| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 96 === ABSTRACT
Carbon nanotube backlight unit (CNT-BLU) is one of the categories of flat surface back-lighting source, which have been developed recently. Comparing with cold cathode fluorescent lamp (CCFL) backlight unit, CNT-BLU has the advantages of high brightness, mercury free, superior color performance and low surface temperature etc.. These merits render the CNT-BLU rather attractive as a backlight unit candidate. However, so far, the luminescent efficiency of CNT-BLUs is not good enough. Hence, the major motivation of this research is trying to further increase the luminescent efficiency of CNT-BLUs.
Basically, the major contributions of this thesis may be summarized as follows. First, an asymmetrical dynamic model of the luminescent property of phosphors is first derived. Second, the derived model is then used to investigate various driving voltage waveforms to further improve the luminescent efficiency by simulations. Then, based on the simulation results, a novel driving strategy is proposed to fully exploit the persistence effect of phosphors for a 20-inch CNT-BLU. Finally, a prototype of the proposed driving system is implemented and tasted. Experimental results show that the resulting illuminative efficiency can be increased by more than 74% as compared with the most recent pulse mode driving strategy.
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