Dielectric Barrier discharge lamp, backlight device, and liquid crystal display device

摘要

A dielectric barrier discharge lamp has a pair of external electrodes disposed in series along the direction of tube axis outside a bulb. A lamp capacity, which is an electrostatic capacity between the pair of external electrodes, is set such that a discharge charge quantity per unit length of the external electrodes and one discharge between the pair of external electrodes is less than 100 nC/m. The lamp capacity is regulated, for example, by a width or a length of the external electrodes or a clearance distance to the external electrodes and bulb. A high lamp efficiency can be accomplished.