Method for predicting motion artifacts of plasma display panels

A simulation method is proposed to predict the motion artifacts of plasma display panels （PDPs）. The method simulates the behavior of the human vision system when perceiving moving objects. The simulation is based on the measured temporal light properties of the display for each gray level and each phosphor. Both the effect of subfield arrangement and phosphor decay are involved. A novel algorithm is proposed to improve the calculation speed. The simulation model manages to predict the appearance of the motion image perceived by a human with a still image. The results are validated by a set of perceptual evaluation experiments. This rapid and accurate prediction of motion artifacts enables objective characterization of the PDP performance in this aspect.

Breakdown Voltage Research of Penning Gas Mixture in Plasma Display Panel

Paschen law and equations, which ignore the influence of the Penning ionization on the electron ionization coefficient （α）, are always used as the approximation of the breakdown voltage criterion of the Penning gas mixture in current researches of discharge characteristics of the plasma display panel （PDP）. It is doubtful that whether their results match the facts. Based on the Townsend gas self-sustaining discharge condition and the chemical kinetics analysis of the Penning gas mixture discharging in PDP, the empirical equation to describe the breakdown of the Penning gas mixture is given. It is used to calculate the breakdown voltage curves of Ne-Xe/MgO and Ne-Ar/MgO in a testing macroscopic discharge cell of AC-PDP. The effective secondary electron emission coefficients （γeff） of the MgO protective layers are derived by comparing the breakdown voltage curves obtained from the empirical equation with the experimental data of breakdown voltages. In comparison with the results calculated by the Paschen law and the equation which ignore the influence of the Penning ionization on α , the results calculated by the empirical equation have better conformity with experimental data. The empirical equation characterizes the breakdown of the Penning gas mixture in PDP effectively, and gives a convenient way to study its breakdown characteristics and the secondary electron emission behaviors.

Simulation Studies of Rib Structure Effect on Discharge Characteristics of Plasma Display Panel

To investigate the effect of the rib structure on the discharge characteristics of the plasma display panel, the potential distribution, particles density distribution and ions incident angle distribution were examined by simulation of a two-dimensional particle-in-cell/Monte Carlo collision, with two kinds of rib structure： the stripe rib structure and the Waffle rib structure. The results showed that the distribution of electric potential at the corner of the discharge cell was almost the same for these two rib structures while in the centre there was a difference between these two rib structures. The striation phenomenon could be observed in both cases. The distribution of density also indicated that the striation phenomenon was accompanied by the firing of discharge, and the Waffle rib structure might reduce the density humps. In the cell with a stripe rib structure, the profiles of the surface charge density along the sustained dielectric layer presented a better fluctuating distribution than that in the cell with a Waffle rib structure. The spatial potential and particle density in the discharge bulk showed that the Waffle ribs could weaken the striation phenomenon, which could be explained by the decrease in the particle numbers in the discharge cell. The simulation results of the ion incident angle showed that most ions impacted the sustained dielectric layer in the normal stripe rib cell with an incident angle in the range of 6° to 19° while with the Waffle rib structure the incident angle of most ions was in the range of 4° to 19°. The Waffle rib structure did not affect the angle distribution of incident ions significantly.

Effects of Xe Gas Content and Total Gas Pressure on the Discharge Characteristics of Colour Plasma Display Panels

The effects of the Xe gas content and total gas pressure on the discharge characteristics of colour plasma display panels including the sustaining voltage margin, white-field chromaticity, discharge time lag （DTL）, discharge current peak, and full-width-at-half-maximum （FWHM） of the discharge current pulse, are experimentally studied. The results indicate that as the Xe gas content in the He-Ne-Xe gas mixture or total pressure increases, the sustaining voltage margin increases, the white-field chromaticity improves, and the discharge current peak has a maximum value, while DTL and FWHM have a minimum value. The mean electron energy in the gas mixture discharge is also calculated through a numerical solution of Boltzmann equation. The experimental results are explained from a view of the mean electron energy variations with the Xe gas content and total gas pressure.

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Studies on fluid model for numerical simulation of gas discharges in color plasma displays

The fluid models of gas discharge in alternating current plasma display panel (AC PDP) cell are discussed. From the Boltzmann equation, the hydrodynamic equations are derived, but this model consumes much computa- tional time for simulation. The drift-diffusion approximation model and the local field approximation model are ob- tained to simplify the numerical computation, and the approximation conditions of these two models are discussed in detail. The drift-diffusion approximation model gives more satisfactory result for PDP simulation, and the expression of energy balance equation is given completely in this model.

Macroscopic cell experiments and three-dimensional modelling on electrode-shaping plasma display cell

A macroscopic cell and three-dimensional fluid model have been used to investigate the discharge characteristics in ac plasma display panel cells of electrode-shaping configurations. Four kinds of non-standaxd geometries （i.e. D-, △-, W- and U-shape electrodes） have been considered. The characteristics of the discharge current, the operating voltage and the discharge efficiency of different configurations have been discussed. It is found that the discharge efficiency can be improved by about 10%-30% compared with the standard geometry, while the operating voltage increases slightly in the non-standard geometries. There is a trade-off between improving the discharge efficiency and lowering the sustaining voltage in design of plasma display cells by electrode shaping.

Effect of Wall Charge on Striation in Plasma Display Cells

Different configurations and driving voltages have been employed to investigate the effect of the wall charge on the striations in macroscopic plasma display panel （PDP） cells. The experimental results show that a discharge channel near the dielectric layer is indispensable to striation occurring in the anode area during a discharge, while the pre-accumulated charge on the dielectric layer and the surface state are not important. The origin of the striation is related only to the physical process in the cell. The dielectric layer acts as a charge collector during a PDP discharge.

非对称荫罩式PDP放电特性和工作参数的模拟研究

本文采用二维流体模型模拟了非对称荫罩式PDP结构的放电过程和放电特性。非对称荫罩式PDP结构的放电过程表明,该结构可产生斜拉的长路径放电,有效地提高放电效率。在5.8×104Pa,Ne+10%Xe的工作条件下,非对称结构相较对称结构发光效率提高了32%左右。同时通过对非对称结构各种参数的模拟表明,在扫描电极的中心偏离荫罩下开孔中心150μm,扫描电极宽度在60μm左右,工作气体压强在5.9×104Pa-6.6×104Pa,Xe比例在15%-20%左右,可使放电效率提高约65%。

彩色PDP动态假轮廓的评价方法——相对比值法

为减小彩色等离子体显示器(PDP)的动态假轮廓(DFC),在分析DFC产生的主要原因和距离法评价DFC的基础上,根据人眼视觉对亮度响应的特性,提出了一种评价DFC的新方法———相对比值法。该方法认为人的视觉是对DFC的相对量敏感,因此,定义任一灰度级的DFC为该灰度级和无DFC的灰度级之间的DFC之和与该灰度级的比值。通过对不同子场编码DFC的计算,结果表明:增加子场数、改变子场顺序、采用斜坡上升编码(SIC)方法,都会使动态假轮廓减轻。根据图像的灰度直方图,对各灰度级选择合适的子场组合,可以进一步优化DFC。

表面放电型彩色AC-PDP 驱动技术的新进展

制约等离子体显示器件（ＰＤＰ）发展的两个关键问题是成本和画质，采用不同的驱动技术可以降低ＰＤＰ的成本和提高画质。主要介绍实现上述目的的最新驱动技术。

AC PDP多脉冲放电特性一维流体模型的数值分析

本文建立了ACPDP单元放电的一维流体模型,对ACPDP单元的多脉冲放电特性进行了数值分析.模型是基于对电子和离子输运的二元流体描述,包括各种粒子的连续性方程和简单的动量传输方程以及Poisson方程和电路方程.计算过程中,假定放电气体为He且处于局域平衡状态,各种粒子的反应几率设为E/P的函数,通过Boltzmann方程解出.模拟了在50kHz方波电压驱动下发生在ACPDP单元内的多脉冲放电行为,给出了放电过程中电压、电流以及各种粒子密度、电位等参量随时间的变化及其在空间的分布.

PDP单元寻址期放电特性的研究

本文基于帕邢定律,采用数值模拟的方法,计算了放电单元内,沿不同放电路径着火电压的分布情况。结合流体模型,研究了寻址期ACCPDP中X电极偏压,对寻址放电以及壁电荷积累的影响。模拟结果表明,寻址期间,在ACCPDP的X电极加一定的正偏压(VX),能达到较好的壁电荷积累,从而降低维持期工作电压。在理论计算的基础上,本文基于气体放电相似性定律,设计和制作了ACCPDP放大单元。拍摄了ACCPDP寻址放电过程,并研究了不同VX偏压对于寻址放电影响。实验得到的放电过程中光发射分布,也间接证明了模拟结果的正确性。

关于PDP荧光粉研究的新思路

针对目前PDP荧光粉存在的不足之处,从量子剪裁理论与真空紫外光谱出发,对高效PDP荧光粉的研究提出了新思路。

PDP用荧光粉的亮度衰减

PDP用荧光粉的亮度衰减分成工艺过程的衰减和工作过程中的衰减。工艺过程的荧光粉亮度衰减是由于在焙烧过程中激活剂 Eu氧化 ,蓝色荧光粉的亮度衰减达到了 2 0 %。本文提出 ,在保护气氛或还原性气氛中焙烧可以防止氧化。PDP工作过程中亮度衰减主要是由于真空紫外光辐射和离子轰击 ,以蓝色荧光粉的亮度衰减最大 ,达到 3 0 %～ 40 %。文中提出 ,用荧光粉的包膜技术可以解决此问题 。

等离子体显示板(PDPs)的封接工艺

本文介绍了用于ＰＤＰｓ封接的低溶玻璃材料的选择方法和ＰＤＰｓ的封接工艺。我们按照此工艺封接出的ＰＤＰｓ的质量令人满意。

等离子显示屏PDP电源的设计

重点论述PDP控制电源的技术特点,详细介绍待机电源、PFC电路、寻址电源、逻辑电源之间的逻辑关系以及设计,同时对EMI、安规等进行设计。

基于薄膜SOI的PDP高压寻址驱动集成电路

基于自主开发的薄膜SOI高低压兼容工艺,研制出一种64位输出的薄膜SOI PDP高压寻址驱动集成电路。测试结果显示,该电路具有80 V驱动电压和20 mA输出电流,电路时钟频率大于40 MHz。

New red phosphor (Y,Gd,Lu)BO_3:Eu^(3+) for PDP applications

Highly efficient phosphors under vacuum ultraviolet excitation are still demanded for the development of plasma display panels and Hg-free fluorescent lamps. The phosphors of Eu3＋ doped （Y, Gd, Lu）BO3 were synthesized with solid state reaction method and the contents of y3＋ Gd3＋, and Lu3＋ for plasma display panel red phosphor were optimized under vacuum ultraviolet excitation. Two new potential candidates, which were （Y1-S-TGdsLuT）BO3： Eu^3＋ （0〈S〈0.2, 0〈T〈0.1） and （GdlYJLuK）BO3： Eu3＋ （0.5〈I〈0.7, 0.2〈J〈0.4, 0〈K〈0.1）, were olgtained. The mechanism of luminescence improvement was discussed upon the analysis of crystal microstructure and excitation spectra.

不同PDP放大单元放电性能的研究

基于放大单元实验研究了不同等离子体显示板(PDP)结构的放电特性。设计并制作了不同结构的放大单元实验屏,在相同条件下比较了不同放电单元的放电延时、红外强度和放电效率。结果表明,荫罩式PDP结构在放电性能上与传统的PDP结构相比有一定的优越性。这些结果对于优化荫罩式PDP结构、改善其性能有一定的指导作用。