• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.748-751
• /
• 2009

This paper provides a novel scheme to enhance luminous efficiency within Plasma Display Panels (PDPs). The He-Xe or Ne-Xe mixtures are mainly used in conventional PDP cells, where their discharge characteristics exemplify different behavior. Significantly, the excitation efficiency in He-Xe is lower than that of the Ne-Xe mixture. This paper demonstrates that by adding a small quantity of Ar or Kr gas in Ne-Xe mixture increases cell efficiency, while for the He-Xe mixtures their cell efficiency is reduced.

• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.51 no.11
• /
• pp.536-540
• /
• 2002

This paper proposes a method to drive an AC plasma display panel(PDP) with a significantly improved contrast ratio. In the proposed method, during the first sub-field of one frame, all PDP cells are reset by the ramp waveform, and during the other sub-field, only the cells turned on in the previous sub-field are reset. No light is emitted during the reset period of every sub-field except the first sub-field. For a 10-bit picture, the luminance of the dark level for the proposed method is 10 times lower than that for the conventional method, in which the ramp waveform for the reset is used in every sub-field. Accordingly, the contrast ratio for the proposed method is 10 times higher than that for the conventional method. For the 10-bit picture, the measured contrast ratio was about 3080:1 for the proposed method and about 285:1 with the conventional method, a result the contrast ratio has been increased in 10.8 times. This result shows that the proposed method can realize an image with high contrast ratio.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2002.08a
• /
• pp.594-597
• /
• 2002

We studied the effect of secondary electron emission from the back plate of AC-PDP, on the ramp waveform driving of the system, using two-dimensional PDP cell discharge simulator. It is found that the secondary electron emission from back plate plays a significant role in getting a stable weak discharge during the ramping up of X-Y electrode voltage. This is because grounded address electrode acts as a cathode during the setup of surface charge, and the secondary electron emission from phosphor in the back plate must be large enough to accumulate surface charges on the dielectric layers without strong plasma discharge. We have concluded that the secondary electron emission coefficient(${\gamma}$) of phosphor, besides MgO, must be known to understand the characteristics of the PDP system. A few suggestions for improvement of the system is also made and tested.

• Information Display
• /
• v.2 no.4
• /
• pp.6-12
• /
• 2001

• Electrical & Electronic Materials
• /
• v.13 no.8
• /
• pp.27-32
• /
• 2000

• Journal of Information Display
• /
• v.2 no.1
• /
• pp.24-33
• /
• 2001

The characteristics of the reset and the address discharges of an alternating current Plasma Display Panel (ac PDP) were studied using 2-dimensional numerical discharge cell simulation. We investigated the wall charge variations during the reset discharge adopting ramping reset pulse and the subsequent addressing discharge. The roles of the ramping reset scheme can be divided into two stages, each electrode gathers wall charges during ramping-up of the initial stage and the built-up wall charges are lost during ramping-down of the later stage. Address discharge does not only change the wall charge distributions on the address and the scan electrodes but also on the sustain electrode. The increase in the wall charges on the sustain electrode was observed with the variation of the applied voltage to the sustain electrode during the address period. The increase of the applied voltage to the sustain electrode during the address period is expected to induce the decrease of the sustain voltage during the display period.

• Journal of the Korean Vacuum Society
• /
• v.15 no.6
• /
• pp.556-562
• /
• 2006

The plasma display panel is made of many small discharge cells, which consist of a discharge space between the cathode and anode. An electrical discharge occurs in the discharge space filled by neon and xenon gases. The electron temperature is determined from the sparking criterion, which theoretically estimates the electrical breakdown voltage in terms of the xenon mole fraction. The plasma in the cell emits vacuum ultraviolet lights of 147 nm and 173 nm, exciting fluorescent material and converting VUV lights to visible lights. The physical mechanisms of all these processes have been theoretically modeled and experimentally measured. The theory and experimental data agree reasonably well. However, new materials and better configuration of cells are needed to enhance discharge and light emission efficiency and to improve the PDP performance.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.61 no.9
• /
• pp.1314-1318
• /
• 2012

Recently, applications of plasma display to the large public display and transparent display gain much attention. With this background, we report characteristics of opposite electrodes discharge cell with long electrode gap in comparison with conventional co-planar surface discharge. The cell size of test panel is $2950{\mu}m{\times}840{\mu}m$, which corresponds to that of the display having diagonal size of 130" with XGA resolution. Electrode gap of co-planar and opposite electrode structure are $240{\mu}m$ and $500{\mu}m$ respectively. These gap dimensions provide similar driving voltage windows. Experimental results show that opposite discharge provides approximately four fold higher luminous efficacy compared with that of the surface discharge. Resulting efficacy is found to be higher than 19 lm/W in green phosphor with 10 KHz continuous pulse operation.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2006.08a
• /
• pp.477-479
• /
• 2006

In this study, a stripe type counter electrode discharge cell for PDP was attempted to realize high luminance efficiency and low firing voltage for fine pitch discharge cells. The cells were prepared using electroplated Cu/Ni electrodes coated with glass dielectric layer. The discharge behaviors of such cells were observed. These results indicate that the counter electrode discharge cells have different discharge behavior compared with coplanar cells, which may affect the luminance efficiency of the panel.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2003.07a
• /
• pp.339-342
• /
• 2003

Main PDP panel efficacy improvement factors are discussed. A large panel efficacy improvement can be obtained through a combination of discharge efficiency improvement and phosphor improvement. Important design elements are a high Xe-content gas mixture, the application of a $TiO_2-layer$, and a new green phosphor with little saturation at high VUV-load. In a 4-inch color test panel with a conventional stripe-type cell configuration a white efficacy of 4.4 lm/W and a luminance of 5000 $cd/m^2$ is obtained for sustaining at 250V in addressed condition.