탄소나노튜브(CNT)는 나노 기술의 대표적인 물질로, 나노 크기의 팁 반경과 100:1 이상의 높은 종횡비, 그리고 물리ㆍ화학적 안정성 등으로 인해 이상적인 전자 방출원 재료로 여겨져 많은 연구기관들이 CNT를 이용한 응용 소자를 개발하고 있다. 나노 기술을 바탕으로 한 CNT 백 라이트 유닛(BLU)은 CNT에 인가된 전기장에 의해 전자가 방출되고 방출된 전자가 고전압으로 가속되어 형광체를 때려서 발광하는 원리로 작동되며, 면광원으로서 고정세의 로컬 디밍, 고속 순간 발광에 의한 잔상 제거 등의 장점으로 고품질의 LCD TV에 적용될 수 있으며, 냉음극형광램프와 발광다이오드를 대체할 만한 차세대 BLU로서 뛰어난 특성을 가지고 있다.
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