Display Laboratory 3 Group, Corporate R&D Center, Samsung SDI, 428-5, Gongse-dong, Giheung-gu, Yongin, Gyeonggi 446-577, Republic of Korea
Abstract. We report on the fabrication of a carbon nanotube field emission backlight unit (CNT-BLU) and its application for liquid crystal displays (LCD). The CNT-BLU was operated with locally controllable luminance and impulse-type scanning. The local luminance control, which is based on a very small block size of 1 cm2, consisted of local dimming and local brightening. This resulted in the contrast ratio of the LCD-TV to be as high as 300 000:1. A fast response time of ~5.7 ms was also achieved from the LCD-TV lit by CNT-BLU, originating from the impulse-type scanning. In addition, the CNT-BLU showed long-term emission stability and high luminance uniformity.
Print publication: Issue 23 (11 June 2008)
Received 7 March 2008, in final form 10 April 2008
Published 6 May 2008
Conclusion - from PDF:4. Conclusion
We have developed an FE-BLU using a CNT emitter (CNTBLU), and then analyzed its field emission characteristics including emission current, stability and uniformity. Well distributed CNTs were precisely integrated into gate holes through simple photolithography and a surface treatment process. The CNT-BLU generated high emission current with long-term stability and the observed emission uniformity was high enough to be used for an LCD-TV. The image characteristics of an LCD-TV lit by the CNT-BLU were evaluated and compared with those by a CCFL. Compared with a CCFL backlight, at least 200 times enhanced contrast ratios and three times improved response times were demonstrated by using the CNT-BLU. These were achieved by fine local luminance control and impulse-type scanning, respectively. Achieving these technologies using CNT emitters is believed to be very promising for the next-generation LCDs with excellent image characteristics.