Study of Electrode Materials in Liquid Crystal Display Backlighting Lamp Systems

Discharge properties of CVD polycrystalline diamond and MgO single crystal (111) plates as electrodes in a cold cathode fluorescent lamp for liquid crystal display backlighting system were investigated. CVD polycrystalline diamond and MgO single crystal (111) plates with polished surface and no polished surfaces, each were employed as the test electrodes. The breakdown voltages for electrode materials of both electrode materials under various Ne pressure filling conditions were measured with a V-Q Lissajous method. The breakdown voltages in them with no polished surfaces were obtained lower than those with polished surface. The relationship between the secondary electron emission coefficient and the surface roughness of CVD polycrystalline plates were influenced strongly as compared with that of MgO single crystal (111) plates.