| 摘要 |
This present invention is aimed to use at least a long diameter and a short diameter to prevent luminance unevenness and at the same time to provide sufficient luminance when the cross section shape is regulated. The solution used in the invention is that the cross section shape of the glass tube 2 is set to the range of 1.2-14.0 mm while the short diameter is set to the range of 0.7-10.0 mm, enabling to regulate a cross sectional shape of a discharge space into a thin flat shape and an elliptic shape so as to prevent generation of contracting positive column and to provide a diffusion positive column. And, the mixed gas including the neon of 60-99.9% and the argon of the rest are enclosed in the glass tube in the range of charged pressure of 6.5-16.0 kPa to optimize luminous efficiency of the cold cathode fluorescent lamp. Thus, luminance unevenness is prevented and incidence efficiency to a light guide plate and a diffusion plate is improved to provide sufficient luminance. |
