Improvement of the discharge efficiency in plasma displays

Abstract

Influence of gas mixture ratio on the luminous efficiency in surface discharge alternating current plasma display panels New combination of a three-component gas, Ne-Xe-Ar, for a high efficiency plasma display panelThe dependence of the efficacy of an alternating current surface-discharge plasma display panel on the gas pressure is investigated for several Xe-Ne gas mixtures. In monochrome green 4 in. test panels the efficacy trends and emission spectra are examined for increasing gas pressure and/or Xe concentration. The measured panel efficacy and emission characteristics are compared with the results of a numerical discharge model. It is found that the discharge efficiency for the cell geometry used in present-day commercial products can be increased significantly by using a larger Xe partial pressure. An increase of the electron heating efficiency and of the Xe excitation efficiency contribute about equally to the efficacy increase. The contribution of the increasing Xe dimer radiation fraction to the efficacy improvement is relatively small. These findings are applied in a 4 in. color test display with a design that resembles the one used in present-day commercial products and contains a gas mixture of 13.5% Xe in Ne at 800 hPa. For realistic operating conditions an efficacy of 3.8 lm/W at a white luminance of 2010 cd/m 2 is obtained. Furthermore, the panel chromaticity improves for increasing Xe partial pressure due to decreasing Ne emission.

The effect of electrode tilt angle on the characteristics of coplanar dielectric barrier discharges with Xe-Ne mixtures

“…Similar results were obtained in the studies carried out by other researchers. 2,5,6 It is well known that a larger gap or a higher Xe concentration results in higher luminance and luminous efficacy within the range between a sustaining voltage and a firing voltage. In this study, the reference case is considered to have a Xe concentration of 10% and a gap distance of 70 lm.…”

“…Figure 9(c) shows that the luminous efficacy decreases with the driving voltage, which has been demonstrated by a number of PDP experiments. [1][2][3][4] It is thus necessary to reduce the driving voltage. The luminous efficacy of a convex structure is almost the same as that of a coplanar structure, while its operation voltage range is much lower than that of a coplanar structure.…”

“…Equations (1), (2), and (4) are solved by using the finitedifference method (FDM). The alternating direction implicit (ADI) method is used to integrate the continuity equation.…”

Characteristics of a micro dielectric barrier discharge ignited by a cold cathode with high ion-induced secondary electron emission for plasma display panel

“…1, 2 The fundamental property of microdischarge in a PDP cell has been experimentally investigated for the last 10 years, [3][4][5][6][7][8][9][10][11][12] and the high Xe concentration of the discharge gas becomes one of the most promising approaches to improve the luminous efficiency. 13,14 But, the condition of high Xe partial pressure accompanies an increase in breakdown voltage, and the development of new cathode material is strongly required for low voltage PDP operation.…”

Improving luminous efficacy using dual sustain pulse waveform associated with short sustain pulse width in AC-plasma display panels

“…[1][2][3][4][5][6][7][8][9][10][11] Since the discharge characteristics are strongly related to sustain pulse waveforms, the modified sustain pulse waveforms have been proposed to improve the luminous efficiency. [12][13][14][15] Nevertheless, it is still necessary to improve the luminous efficacy to survive in the display market.…”