Improvement of luminous efficacy and driving characteristics in AC plasma display by changing the bus position

Two different ac plasma displays having different bus electrode position were simulated using two-dimensional fluid code. In a conventional plasma display, the bus electrode was located at the outer part of each cell. However, in a proposed structure (hereinafter the in-bus), the bus electrode was positioned at the inner part of each cell. The differences in electron density, Xe^*(³P₁) density and wall charge distributions between the conventional and the in-bus structures were studied. Because of the bus position in the in-bus structure, the discharge and wall charges tended to accumulate more at the center of cell than the conventional structure. In Xe 10%-Ne mixture at 500 torr, the simulation showed the comparable discharge efficacy in both structures. 7.5´´ test panels in 0.68 × 0.90 mm pixel pitch were fabricated for the measurements of luminance, efficacy and driving characteristics. In Xe 8%-Ne mixture, both structures showed very similar efficacies and luminance, but in Xe 14%-Ne mixture, the in-bus structure showed 5% higher efficacy and luminance than the conventional structure. To evaluate the driving characteristics of the test panel in Xe 14%-Ne mixture, the delays of discharge ignition were measured during the address period. Total delay of the ignition in the in-bus structure was less than 1.4 μs, and it was 30-40% less than total lag of ignition in the conventional structure.