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Spectroscopic analysis of the non‐circular external electrode fluorescent lamp for large‐sized LCD backlight applications
Author(s) -
Ko JaeHyeon
Publication year - 2010
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid18.11.988
Subject(s) - backlight , fluorescent lamp , materials science , gas discharge lamp , perpendicular , mercury vapor lamp , argon , phosphor , electrode , optics , fluorescence , emission spectrum , ionization , liquid crystal display , spectral line , atomic physics , optoelectronics , analytical chemistry (journal) , chemistry , physics , ion , geometry , mathematics , astronomy , organic chemistry , chromatography
— The spectroscopic analysis of the external electrode fluorescent lamp (EEFL) having non‐circular cross sections was carried out in order to obtain insight into the discharge condition confined in this unusual discharge space. The emitting spectra of EEFLs with and without phosphor layers were investigated as a function of the measurement position and/or time. It was found that the argon (Ar) emission was intense when the lamp was turned on and decreased rapidly as the Hg emission lines got stronger. The intensities of visible lines from mercury atoms were measured as a function of position along the direction perpendicular to the channel axis. It was found that the positive column does not spread in the entire discharge space but was contracted at the center of the channel. This result was discussed in relation to the ionization process occurring in the low‐pressure discharge lamps. In addition, the correlation between the cross‐sectional shape and the backlight efficiency was investigated, from which optimized shape parameters could be derived.