Light source device and liquid crystal display device

A liquid crystal display device comprising

• a light source device, wherein the light source device comprises at least one discharge tube and first and second electrodes, in which application of a voltage only across a first electrode and a second electrode causes excitation of a discharge medium sealed inside the discharge tube, wherein the first electrode is arranged only at an end inside the discharge tube, the second electrode is in contact with an outer surface of the discharge tube at a plurality of contact portions, the contact portions being located at different distances from the first electrode and being provided discontinously, the plurality of the contact portions are arranged in a tube axial direction of the discharge tube at the same potential, and a mixture gas containing xenon gas and at least one selected from argon gas and krypton gas is sealed in the discharge tube, the xenon gas accounting for 60 percent by volume to 80 percent by volume.