Jin Ho Yang

The addressing characteristics of an alternating current plasma display panel adopting a ramping reset pulse

The characteristics of the address discharge of an alternating current plasma display panel (ac PDP) adopting a ramping reset pulse were studied using two-dimensional (2-D) numerical simulation. We investigated the principal parameters of the reset pulse for a successful address discharge. In this paper, we suggest a new parameter, the terminal voltage of the ramping reset pulse, and its effects on the minimum address voltage and current flow characteristics during the address discharge. The minimum addressing voltage decreased with increase in the ramping-down time and with increase in the terminal voltage of the ramping reset pulse, which were explained with the wall charge characteristics obtained by a 2-D simulation and confirmed through an ac PDP experiment.

Comparison of electric field and priming particle effects on address discharge time lag and addressing Characteristics of high-Xe content AC PDP

The alternating current plasma display panel (AC PDP) is generally driven by the subfield method to realize the gray scale, and each subfield is composed of reset, address and display period. Therefore, a significant time should be allocated to an address period in high-resolution PDP, which results in a short display period and a reduction of brightness, and so the dual scan method has been widely used to solve this problem. In this case, however, the address electrodes need to be physically divided into two parts and driven by different data drive integrated circuits (ICs), thereby causing a cost up due to doubling the number of data drive ICs. In this paper, we investigate the factors that could influence the address discharge time lag and, in particular, the electric field effects and priming particle effects are compared in order to achieve high speed addressing. In this regard, the address characteristics of high-Xe content panel are investigated from which it was found that the address discharge time lag was reduced to one half that of the conventional method when the priming particles are provided.

A driving method for high-speed addressing in an AC PDP using priming effect

A novel driving method is proposed to reduce the addressing time in an ac plasma display panel. In this method, priming discharges are used to achieve high-speed addressing without adding an auxiliary electrode. Some of the scan lines were used to provide the priming particles for the reduction of the address discharge time lag (t/sub d/) in the adjacent scan lines. The number of priming electrodes was optimized and two different types of priming discharge were tested in order to reduce the inherent light output caused by the priming discharges. In the panel experiment, the t/sub d/ was reduced to one half of that of the conventional method when the priming particles were provided and the background luminance was reduced from 4.97 to 2.94 cd/m/sup 2/ through the reduction of the number of priming electrodes, and further, by changing the type of the priming discharge while the peak luminance could be improved more than twice by allocating the saved-time-to-display period, which in turn, resulted in a higher contrast ratio.

The improvement of discharge characteristics by the use of asymmetric pulse driving in an alternating current plasma display panel

Asymmetric pulse driving was employed to enhance the luminance and luminous efficacy of an AC plasma display panel (PDP). We observed dependencies of operating voltages, luminance and luminous efficacy on the pulse off-time ratio in asymmetric pulse driving. The luminance and luminous efficacy of the ac PDP improved when it was operated with small pulse-off time ratios in the asymmetric pulse driving. The spectral and temporal emission characteristics of vacuum ultraviolet (VUV) were investigated to explain the improvements. The luminous efficacy and VUV emission increased with the decrease of pulse off-time ratio, and with the increase of gas pressure.

A new RMSP reset pulse for improved reset discharge controllability in AC PDP

We are proposing a new ramp-biased multiple short pulse (RMSP) for AC plasma-display panels, which is composed of multiple short pulses with fast ramp bias up to 5 V//spl mu/s. Through adjustment of the period and duty ratio of RMSP and using the tail effect, we have succeeded in controlling the final wall voltage level by /spl plusmn/10 V from the level of (peak RMSP voltage)-(discharge breakdown voltage). We applied RMSP to the reset period and achieved stable discharge, higher address margin, and lower background luminance as well as shorter reset time. When compared with the conventional ramp reset method, the new reset method using RMSP could improve the darkroom contrast ratio by 52% and shorten the reset time by 215 /spl mu/s for each subfield.

55.2: Luminous Charcateristics Analysis of a New SDR Cell Structure AC PDP

A new AC PDP pixel structure with Segmented electrode in Delta color arrayed Rectangular subpixel (SDR) shows high luminance and luminous efficiency simultaneously compared with those of the conventional type AC PDP. The luminous characteristics of a new SDR structure were analyzed with 3-dimensional numerical simulation and ray optics calculation. Also, the test panels of SDR structure were fabricated and their addressing charcateristics were examined.

Spatio-Temporal Variation of VUV and IR Emission from Surface Discharge Type AC PDP Cell with He-Xe and Ne-Xe

The spatio-temporal variations of 147nm, 173nm, and IR emission images were obtained from He-Xe and Ne-X surface discharge type AC PDP cell. Differences in the 147nm, 173nm, and IR emission characteristics between He-Xe and Ne-Xe gas mixture were observed and explained by the difference of Xe mobility and dimer reaction coefficients in two cases.

Application of dichroic mirror for improvement of luminance and luminous efficacy in an alternating current plasma display cell

An alternate application of dichroic mirror for the improvement of luminance and luminous efficacy in an ac plasma display panel (PDP) is suggested. Since only part of the vacuum ultraviolet (VUV) generated in the PDP cell is used to excite the phosphor, we propose deploying a dichroic mirror that increases luminance and efficiency by reflecting part of the VUV toward the phosphor. The optical constants of the dielectric layers of the dichroic mirror and a protecting layer of a PDP were determined from the measurements of reflectance and transmittance of the corresponding films and they were used to design the dichroic mirror including the protecting layer. The 147 nm xenon resonance line is usually used to activate the phosphor in the PDP cell. Thus, we designed the dichroic mirror to have a high reflectance for the VUV centered around 147 nm and a high transmittance for the visible light. We investigated the usefulness of the dichroic mirror by comparing the luminance and luminous efficacy of test panels with and without the dichroic mirror and found it could increase the luminance by 20%–31% and the luminous efficacy by 25%–34%.

P-58: A New Reset Method Using Ramp biased Multiple Short Pulses RMSP for AC PDP

We are proposing a new reset method for AC PDP, which is composed of multiple short pulses with fast ramp bias voltage. We have succeeded in achieving low background luminance as well as stable and higher address margin. When compared with the conventional ramp reset method, the darkroom contrast ratio can be increased by 52% and the reset time can be shortened by 215μs for each subfield.

Spatio‐temporal variation of VUV and IR emissions from surface‐discharge‐type ACPDP cell

— The spatio-temporal variations of 147-nm, 173-nm, and IR emission images were obtained from He-Xe and Ne-Xe surface-discharge-type ACPDP cells. Differences between the 147-nm, 173-nm, and IR emission characteristics between He-Xe and Ne-Xe gas mixtures were observed and explained by the difference of Xe mobility and dimer reaction coefficients in two cases.