Abstract
A capillary discharge tube is very useful for the back light source for a liquid crystal display device. The luminance and the spectral characteristics of the positive column of the capillary discharge tube usually depend on plasma parameters of positive column. Therefore, it is very important to investigate the relation between the spectral characteristics and the plasma parameters in order to increase the spectral luminous efficiency of discharge tubes. In this paper, the luminance and the spectral characteristics were measured for a cylindrical capillary discharge tube. Then the plasma parameters were also measured. The gases used were helium, neon and argon. The tube used for measurement was 1 mm in diameter and the discharge current was 10∼50 mA. The gas pressure was varied from 0.2 to 20 Torr. The luminance and the spectral characteristics were obtained as a function of the gas pressure. The electron temperature and the axial electric field were also measured as a function of the gas pressure. The experimental results were discussed qualitatively.
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