AC-PDP放電特性與堆疊電極-韓國電子工程dissertation  Discharge Characteristics of AC-PDP with Stacked Facing Electrode

Jung Woo Ok, Ho-Jun Lee, Hyun-Jong Kim, Hae Jun Lee and Chung-Hoo Park

Dept. of Engineering, Pusan National University, Pusan 609-735, Korea

Abstract

我們提出堆疊電極（SFE）結構的PDP， 其中匯流電極和電介質交替層疊在PDP玻璃的前側。We have proposed a PDP with Stacked Facing Electrode (SFE) structure, in which bus electrode and dielectric are alternatively stacked on the front side glass of PDP. Advantage of the SFE structure is that ITOless electrodes and low capacitance. In this

paper, we study discharge characteristics of SFE structure, which are summarized by low charge current, short addressing time and long discharge time.  http://ukthesis.org/Thesis_Writing/Accounting_Assignment/Engineering/

1. Introduction

Commercialized Plasma Display Panel (PDP) with co-planar electrodes structure is a most popular large-area flat panel display device such as 40 to 100 inch screen for digital TVs.許多研究人員和制造商已經作出他們的努力提高AC-PDP的性能，改善發光亮度和發光效率是AC-PDP技術的重要工作。 Many researchers and manufacturers have been making their effort to improve the performance of AC-PDP. The improvement of luminance and luminous efficiency is the one of the most important works to be done in AC-PDP technologies. The extended discharge-gap and high Xe content were popular approaches to obtain high luminous efficiency [1,2,3,4,5].

However, in order to achieve high luminous efficiency using high Xe content or long co-planar gap discharge, the operation conditions such as dynamic margin, addressability, and the reliability were getting worse compared to those of the conventional PDP [6, 7]. We have proposed a PDP with Stacked Facing Electrode (SFE) structure, in which bus electrode and dielectric are alternatively stacked on the front side glass of PDP. An advantage of the SFE structure is low discharge current, high luminance, short addressing time, and high luminous efficiency[8]. In this paper, we study discharge characteristics of PDP with SFE structure.

2. Panel Structure

Fig. 1 and Table 1 show the Stacked Facing Electrode (SFE) structure and the specification of the test panel. It does not need transparent ITO layer in front glass. SFE structure consists of bus electrodes and dielectric layers. The gap size between electrodes is split into 330μm, 350μm and 370μm. We make a test panel with three layers in facing electrode. Each layer is composed of electrode and dielectric having 10μm of height. To prevent breakdown of insulation in discharge, width of dielectric and#p#分頁標題#e#

height of last dielectric layer are 30 μm. Total electrode height is 80 μm.

The cell size of a sub-pixel is 300×676 μm which is the dimension of one sub-pixel in 42-inch PDP with XGA resolution. The ITO electrode gap of co-planar type is 60μm. Fig. 1 Schematic drawing of SFE structure Table 1 Specification of test panel Working Gas : Xe(8%) + Ne Base, 400Torr

 

3. Experiments and Discussion

The test panels are 4-inch monochrome green and all the experiments are done under 10 kHz, 25% duty continuous sustaining condition. The Xe content is 8% and the total pressure is 400Torr.

Fig. 2 shows SEM image of SFE structure having discharge gap 370 μm. After annealing, discharge gap of first layer, second layer and third layer are each 320 μm, 340 μm, 390 μm. Average of three layers is 350 μm. The height of first layer, second layer, third layer are each 20 μm , 20 μm , 40 μm and total height is 80μm.

(a) SFE structure on front glass

(b) Cross section of discharge gap at 370μm

Fig. 2 SEM image of SFE structure

3.1 Discharge current and Efficiency

The current and efficiency characteristics were already reported in IDW’05. [8] Here we present more detail results. Fig. 3 (a) shows discharge current characteristic of co-planar structure and SFE structure. The discharge current of SFE structure is lower about 50% than that of co-planar structure. Fig. 3 (b) shows luminous efficiency characteristic of co-planar structure and SFE structure. 超臨界流體萃取的結構的發光效率比共平面結構高約300%。The luminous efficiency of SFE structure is higher about 300% than that of co-planar structure. 此外，亮度的特點是更高，更廣泛的放電間隙。值得注意的是，越長的放電間隙，越低的放電電流和更高的發光亮度和發光效率。Also, luminance characteristic is higher as wider discharge gap. It is noted that the longer discharge gap, the lower discharge current and the higher luminance and luminous efficiency.Fig. 3 Discharge current and luminous efficiency characteristic of co-planar and SFE structure

3.2 Discharge and IR Waveform

Fig. 4 shows discharge current and IR emission waveforms for the co-planar and SFE structure. 在相同的電壓脈沖，共平面 結構的開始快于SFE結構的。但是放電

SFE結構的電流遠低于共面的結構。At same voltage pulse, co-planar structure begins faster than that of SFE structure. But discharge current of SFE structure is much lower than that of co-planar structure. IR waveform of SFE structure is a little higher and wider than those of co-planar structure.

(a) SFE structure

(b) Co-planar structure

Fig. 4 discharge current and IR waveform

3.3 Discharge Image

IR image was taken by a gated ICCD camera to investigate the spatial distributions. Fig. 5 shows IR image of the discharge propagation of co-planar and SFE structure at gap 370μm. The discharge initiates from the anode side due to fast electron and moves to the cathode side. Then strong discharge occurs on the cathode side also. At the same time, the large-strong discharge occurs on the anode side. After all both electrode area become dark as a net potential applied on the gas space is decreased by accumulation of wall charges. The discharge duration is about 560nsec. In case of SFE structure, the shape of discharge is more wide and continuing than that of co-planar structure.

Fig. 6 shows discharge time characteristic of co-planar and SFE structure. 放電開始時間共平面的結構是比SFE結構更快的，但通過延長放電間隙，放電持續時間的超臨界流體萃取的結構是長于共平面結構。Discharge start time of co-planar structure is faster than that of SFE structure, but by lengthening discharge gap, discharge continuation time of SFE structure is longer than that of co-planar structure. Also peak continuation time of SFE structure is longer than that of co-planar structure.

In case of SFE structure, the wider discharge gap, the longer discharge and peak continuation time. In proportion to the discharge path, SFE structure is operated in lower electric field,low electron energy conditions. The proposed structure basically provides opposite discharge mode and we can expect lower surface loss of charged particles. These characteristics results in high luminous efficiency. [8]

(a) Co-planar structure

(b) SFE structure

Fig. 5 Gated ICCD image co-planar 330um 350um 370um

 

3.4 Addressing Jitter

Fig. 7 shows light waveform of repeated address discharge. The formative time lag (tf) of SFE structure is almost same as that for co-planar structure. On the other hand, statistical time lag (ts) reduced up to about 60% of co-planar structure because scan electrode protruded from front glass is exposed in the discharge space.

(a) Conventional structure

(b) SFE structure

Fig. 7 Light waveform of addressing jitter

4. Conclusion

In summary, we proposed a new PDP structure that can provide facing discharge mode using vertically raised bus electrode on the front glass.我們做了4英寸的測試面板的堆疊電極。We made stacked electrode type in 4-inch test panel. 疊放向電極（SFE）的PDP的結構表明，具有比傳統的共面電極結構具有高亮度，發光效率，更寬的電壓裕度，較低的放電電流。The PDP of Stacked Facing Electrode (SFE) structure showed that higher luminance, luminous efficiency, wider voltage margin, and lower discharge current than that of the conventional coplanar electrode structure. [8] In this paper, we have studied discharge characteristics of SFE structure. SFE structure showed much lower discharge currents, longer discharge time than those of coplanar structure. As a result of those, Efficiency of SFE structure is higher than that of co-planar structure. Addressing jitter of SFE structure is reduced up to half of that of co-planar structure.The performance enhancement in proposed structure is due to its large discharge path, low electric field and low surface loss of charged particles.#p#分頁標題#e#

7. References

[1] J.D. Schemerhorn, E. Anderson, D. Levison, and C. Hammon,J. S. Kim, “A controlled Lateral Volume Discharge for High Luminous Efficiency AC-PDP”, SID’00, pp106-109, 2000.

[2] W. J. Chung, B. J. Shin, T. J. Kim, H. S. Bae, J. H. Seo, and K. W. Whang, “Mechanism of High Luminous Efficiency Discharges With High Pressure and Xe-Content in AC PDP”IEEE Trans. Plasma Sci, vol. 31, no. 5, pp1038-1043, 2003.

[3] G. Oversluizen, T. Dekker, M. F. Gillies, and S.T. Dezwart,“High Efficacy PDP ”, SID’03 DIGEST, pp28~31, 2003.

[4] J. Ouyang, T. Callegari, B. Caillier, and J.P. Boeuf, “Large-Gap AC Coplanar Plasma Display Panel Cell: Macro-Cell Experiments and 3-D Simulations” IEEE Trans. Plasma Sci, vol.31, no. 3, , pp422-428, 2003

[5] J. H. Lee, B. J. Kim, S. M. Hong, K. C. Choi, “Discharge characteristics of the AC PDP with Coplanar long-gap Electrodes”, SID’03, pp426-430,2003.

[6] J.S. Kim, J.H. Park, T.J Kim, K.W. Whang “Comparison of Electric Field and Priming Particle Effects on Address Discharge Time Lag and Addressing Chaacteristics of High-Xe Content AC PDP” , IEEE Trans. ED, Vol.31,No.5,2003

[7] K.C. Choi, B.J. Kim, J.H. Lee, S.M. Hong, B.J. Shin“Improvement of the Efficiency and the Addressability by Using the Auxiliary Pulses in an AC PDP” IDRC’03, pp129-132, 2003

[8] J.W. Ok, H.J. Lee, W.S. Choi, Y.M. Jang, H.J. Lee and C.H. Park “A Study on the Characteristics of AC-PDP with Stacked Facing Electrode” IDW’05