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2002•SID Symposium Digest of Technical PapersRequires access

P‐38 Discharge Characteristics of External Electrode Fluorescent Lamps (EEFLs) for LCD Backlighting Application

S. S. Lee, Jhoon Kim, Sung Won Lim

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Abstract

Abstract The discharge characteristics of the external electrode fluorescent lamps (EEFL) depending on the widths of the external electrodes were evaluated and compared with that of the cold cathode fluorescent lamps (CCFL). The conventional inverter was used for driving EEFL and CCFL. The luminance of the EEFL with 20mm of external electrode width and CCFL at 12V of inverter input voltage were 22,000 cd/m 2 and 25,500 cd/m 2 , respectively. The luminance and efficiency of the EEFL is similar to that of CCFL or CEFL. The life time of EEFL is expected to be much longer than that of CCFL or CEFL so that the EEFL could be more useful as the lamps for LCD backlighting.

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What this paper is about

Abstract The discharge characteristics of the external electrode fluorescent lamps (EEFL) depending on the widths of the external electrodes were evaluated and compared with that of the cold cathode fluorescent lamps (CCFL). The conventional inverter was used for driving EEFL and CCFL. The luminance of the EEFL with 20mm of external electrode width and CCFL at 12V of inverter input voltage were 22,000 cd/m 2 and 25,500 cd/m 2 , respectively. The luminance and efficiency of the EEFL is similar to that of CCFL or CEFL. The life time of EEFL is expected to be much longer than that of CCFL or CEFL so that the EEFL could be more useful as the lamps for LCD backlighting.

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Available abstract

Abstract The discharge characteristics of the external electrode fluorescent lamps (EEFL) depending on the widths of the external electrodes were evaluated and compared with that of the cold cathode fluorescent lamps (CCFL). The conventional inverter was used for driving EEFL and CCFL. The luminance of the EEFL with 20mm of external electrode width and CCFL at 12V of inverter input voltage were 22,000 cd/m 2 and 25,500 cd/m 2 , respectively. The luminance and efficiency of the EEFL is similar to that of CCFL or CEFL. The life time of EEFL is expected to be much longer than that of CCFL or CEFL so that the EEFL could be more useful as the lamps for LCD backlighting.

Key concepts: Backlight, Cold cathode, Liquid-crystal display, Luminance, Electrode, Fluorescent lamp, Materials science, Optoelectronics

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P‐38 Discharge Characteristics of External Electrode Fluorescent Lamps (EEFLs) for LCD Backlighting Application — Research Paper | ScholarLens