A New AC Plasma Display Panel With Auxiliary Electrode for High Luminous Efficacy

A new ac plasma display panel (PDP) for high luminous efficacy is proposed, and its characteristics are investigated. The new ac PDP has a coplanar gap of 200 mum and an auxiliary electrode located between the scan and common electrodes. The periodic pulses are applied to the auxiliary electrode during the sustain period, which plays the roles of enhancing the infrared emission and reducing the discharge current. The sustain voltage decreases with the increase of the auxiliary pulse voltage until 80 V. When the voltage of the pulse applied to the auxiliary electrode is 50 V, the luminous efficacy reaches its peak value and is approximately 8.7 lm/W obtained from the measurement of Ne + 20% Xe gas-mixture discharges in the green cells. The luminous efficacy of the new proposed test ac PDP with Ne + 13% Xe and Ne + 20% Xe gas mixtures is improved by 190% and 320%, respectively, compared to that of the conventional ac PDP with a Ne + 13% Xe gas mixture     

A study on the new type sustaining electrode showing high luminousefficiency in AC PDPs

In order to improve the luminous efficiency of ac plasma display panel (PDP), a new bridge type sustaining electrode is suggested. The luminous efficiency of the ac PDP with suggested new sustaining electrodes is improved about 30% compared with that of conventional sustaining electrodes. Furthermore, the suggested ac PDP is maintained almost the same luminance with the conventional ones, and this type has a merit of free alignment between front and rear panels     

Driving Characteristics of a High-Efficacy AC PDP With an Auxiliary Electrode

A new driving waveform was proposed in order to stabilize the driving characteristics of a high-efficacy AC plasma-display panel (PDP) with a coplanar gap of 200 mum and an auxiliary electrode. To stabilize the reset and address discharge, an erase pulse was applied to the auxiliary electrode instead of the sustain electrode after the sustain period. The write pulse was applied to the scan electrode, and a reset discharge was induced between the scan and auxiliary electrodes. As a result, the minimum address voltage could be reduced to a level similar to that achieved with a conventional ac PDP with a coplanar gap of 80 mum. Furthermore, the address-discharge time lag of the ac PDP with a coplanar gap of 200 mum was improved to a level that is comparable with that of the ac PDP with a coplanar gap of 80 mum.     

The addressing characteristics of an alternating current plasmadisplay 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     

Improvement of color temperature using independent control of red, green, blue luminance in AC plasma display panel

This paper presents a new driving scheme for the improvement and flexibility of a color temperature without sacrificing a peak white luminance using an independent control of the red (R), green (G), and blue (B) luminance in an alternating current plasma display panel (AC-PDP). The independent control for the R, G, and B emissions can be achieved by selective application of the various narrow auxiliary pulses to the R, G, and B address electrodes during a sustain-period. The auxiliary pulses can control the luminance levels independently from the R, G, and B cells by forming the fast and efficient plasma or by slight disturbing of the wall charge accumulation. By the application of various auxiliary pulses leading to the simultaneous control of each color's luminance, it is observed that the new driving scheme can improve the color temperature from 5396 K to 10 980 K in a 4-in test panel with almost the same peak white luminance as that of the conventional driving scheme.     

Improve the luminous efficiency of AC plasma display by high-frequency driving on address electrodes

A novel high-frequency driving scheme was proposed in this paper to improve the luminous efficiency of a plasma display. High-frequency oscillating waveform was applied to the address electrodes of the conventional three-electrodes AC-type plasma display panel during the sustaining period. More vacuum ultraviolet rays were generated by the high-frequency waveform so that the luminance and luminous efficiency could be enhanced. From experiments on an 8.5-in panel, the luminance was improved and the luminous efficiency was enhanced more than 40%.     

纳秒快脉冲提高等离子体显示平板光效研究

目前等离子体显示平板(PDP)主要问题是光效不高。基于快脉冲驱动能显著提高介质阻挡放电光效的理论基础,提出了快脉冲驱动提高PDP光效的新思路。利用CPLD可控编程控制技术,通过控制快速开关MOSFET开通、关断,实现正负几百伏双极纳秒脉冲输出,使PDP工作在维持驱动期。实验测量了输入电功率及发光效率。给出不同上升沿、脉宽与光效的对应关系,分析硬开关阶段上升沿参数选取的参考值。试验表明,快上升沿脉冲驱动能够显著地改善PDP的发光效率。     

荫罩式等离子体显示器Ne-Xe气体放电性能研究

对36cm新型荫罩式等离子显示器(SM-PDP)的气体放电进行了实验,对着火电压、光效、亮度及气压等一系列参数进行实验分析和研究,给出了SM-PDP气体放电的部分性质。     

The Operation Characteristics of an Alternating Current Plasma Display Panel With Si-Doped MgO Protecting Layer

In this paper, the operation characteristics of an ac plasma display panel (PDP) with Si-doped MgO protecting layer are investigated. The test panels are fabricated with the protecting layers of conventional MgO and Si-doped MgO, and the operation voltage margin, luminous efficacy, and address discharge time lag are observed. Even though the test panel with Si-doped MgO protecting layer showed lower operation voltages, higher luminous efficacy, and shorter statistical discharge time lag, its addressing discharge characteristics become deteriorated as the scanning time is increased from the end time of the reset period. The photon-induced surface conductivity increased by Si doping into MgO, and surface charges on the Si-doped MgO protecting layer showed faster decay characteristics compared to those on the conventional one. It is believed that the impurity doping into the protecting layer can improve the short-period characteristics of an ac PDP, but the long-term stability of surface charge retention is deteriorated.     

新型介质阻挡放电平面光源高压窄脉冲逆变电源的设计与研究

为了提高介质阻挡放电型平面光源的放电效率,本文设计并给出了一种可用于介质阻挡型平面光源及基于介质阻挡原理的气体放电器件的高压窄脉冲产生电路.该逆变电路包含两个全桥逆变电路部分,通过控制两全桥逆变电路输出脉冲的相位差来实现高压窄脉冲的输出.设计并验证了基于12英寸介质阻挡放电平面光源的电路原型.实验结果表明,该逆变电路可以实现最小脉宽为800 ns,脉冲幅值为4.5 kV的高压窄脉冲;亮度及发光效率随工作频率的升高而升高;当输入功率为36.4W时,亮度可达3200 cd/m2,此时系统发光效率为13.4 lm/W.     

彩色PDP发光效率的分析及改善方法

分析了影响等离子体显示器(PDP)发光效率的因素,在此基础上, 介绍了提高PDP发光效率的四种措施:选择10%Xe,使用新型的单元结构,利用正柱区放电以及外加射频电压.     

A new method to reduce addressing time in a large AC plasma displaypanel

To replace the dual scan system by single scan in large ac plasma display panel (PDP), the addressing time should be reduced by modifying cell structure and/or driving circuits. Moreover, the luminance of the PDP can also be increased with the decrease in the addressing time. In this paper, we suggest the bus and address electrodes with triangular protruding tips in order to reduce the addressing time. Moreover, the addressing time of the ac PDP with these electrodes was investigated experimentally with address and display period separated (ADS) driving method. The experimental results show that the addressing time can be reduced more than 30% compared with the conventional type by modifying the electrodes without reducing the luminance of the PDP     

真空荧光显示器亮度特性的研究

为了确定真空荧光显示器(Vacuum Fluorescent Display,VFD)亮度特性(灯丝发射电流、电流分配系数、发光效率和亮度)与阳极电压的关系,缩短开发时间并提高新品开发的成功率,选取8种常见颜色荧光粉制作了8种型号的VFD实验样品,实测每个步长阳极电压下的灯丝发射电流、阳极电流以及亮度数据,利用最小二乘法得到了灯丝发射电流随阳极电压变化的关系,采用右逼近法分别给出了电流分配系数及发光效率的威布尔拟合公式,最终确定了亮度随阳极电压变化的计算表达式。研究结果表明,实验设计方案切实可行,灯丝发射电流、电流分配系数及发光效率随阳极电压变化的拟合公式精确度很高,亮度的计算值与实验值相比误差很小,便于在设计之初只需根据阳极电压设计值就能够获得VFD的亮度特性,为VFD的结构优化设计提供重要的理论依据和技术参考。     

彩色PDP放电单元参数设置分析

本文对三电极表面放电反射结构彩色PDP放电单元进行了等效和分析,利用一实验验证及计算机模拟的结果,研究了放电单元的一些参数变化对单元亮度、功耗以及发光效益的影响,为彩色PDP的单元设计提供了一定的参考。     

等离子体显示板面光源的制备技术及光电特性研究

利用等离子体显示板自发光、薄型、亮度高、发光均匀的特点,开发出基于等离子体显示机理的薄型等离子体面光源,用于需要薄型照明的特定场合.为克服等离子体显示板发光效率过低的不足,对面光源显示板的结构、材料,工艺和驱动电路诸方面进行多项改进,经改进后的等离子体面光源最小厚度不大于4 mm,亮度350 cd/m2,色温为 6500 K,发光效率4Lm/W.光源型 PDP 显示板的研究结果对进一步提高图象型 PDP 显示板的光电性能提供了有益的启示.     

Enhanced carrier balance by organic salt doping in single-layer polymer light-emitting devices

We have showed that the doping of an organic salt into a PVK-based polymer emissive layer could enhance the carrier balance greatly to result in higher luminance and luminous efficiency. It is found out that the salt-doped devices show the similar operating characteristics of frozen-junction light-emitting electrochemical cells (LECs). With the salt doping of 0.6 wt.% and an appropriate salt activation process, the fabricated PVK-based polymer light-emitting diodes (PLEDs) shows the luminous efficiency of 15 cd/A at the highest luminance of 55,000 cd/m² even without an electron-injecting LiF layer. Due to the enhanced carrier balance, the luminous efficiency is found to be maintained from the turn-on voltage to the voltage for the maximum luminance, which means a linear relationship between luminance and current density.     

Color plasma displays

After decades of research and development, plasma displays are finally beginning to appear in the commercial and consumer markets. Following a short review on the basic principles of direct and alternating current plasma displays, we present a summary of the status of color plasma displays. Plasma display panels (PDPs) have finally achieved luminance and efficiency values on par with hi-definition cathode ray tube monitors. Additional improvements in performance will open up a new world of large PDP displays. Ultimately, what will drive the PDP market will be continued improvements in the performance of color PDPs themselves. PDP makers are working on reducing power consumption through improved luminous efficiency and improved component materials and manufacturing methods of color PDPs. With improvements in the cell structure and driving methods, there is a good prospect of achieving a luminous efficiency of 2-3 lm/W and a power consumption of about 200 W for 50-in diagonal size     

New Sustain Waveform for Improving Luminous Efficiency in Wide-Gap Plasma-Display Panel

The three-electrode microdischarge characteristics of ac-plasma-display panels (PDPs) are analyzed with a wide sustain discharge gap of 180 mum. In particular, the luminous efficiency variation is examined as a parameter of the operating frequency. It is found that the luminous efficiency decreases with an increase in the operating frequency. In other words, a failure discharge mode for luminous efficiency occurs at a high frequency up to 200 kHz, originating from a self-erasing discharge and the space-charge behavior under high sustaining frequency conditions. Thus, based on an analysis of the failure mode of a wide-gap discharge, a new sustain waveform is proposed to improve the luminous efficiency at a high operating frequency. As a result of adopting the proposed sustain waveform, a luminous efficiency of 2.4 lm/W is obtained at a sustain voltage of 170 V in a 42-in high-definition wide-gap PDP.     

Discharge physics of alternating current plasma display panels (PDPs)

In this paper, we describe the experimental techniques and numerical modeling approaches to understand the alternating current plasma display panel (ac PDP) discharge physics. Conventional ac PDP uses microscale dielectric barrier discharge, and the spatio-temporal visualization of discharge not only helps to understand the discharge dynamics, but also validates the models adopted in the computer simulation study of PDP cell. The experimental observations using optical spectroscopy and imaging method turned out to be very helpful especially for the understanding of discharge dynamics including gas reactions and wall charge formation. The numerical simulation shows good agreement with experimental observations which allows us to use the computer simulation to extract more useful information with more confidence. Some parametric study, such as the effects of the variations of cell pitches, address electrode width, barrier rib height, and geometrical structure, etc., on the luminous characteristics of PDP had been carried out and could now well be explained.     

彩色等离子体显示器自动功率控制方法研究

为降低彩色等离子体显示器(PDP)的功耗,提高图像质量,在分析了寻址功耗和图像数据在各子场列方向上的变化率有关的基础上,根据自动功率控制(APC)的原理提出了自动功率控制的方法,该方法的主要内容包括:图像最小残像工作模式,图像信号的平均强度和维持脉冲数的关系,图像负载率和亮度及功耗的关系等.根据以上APC的原理和方法研制的107cm(42英寸)彩色PDP电路在功耗和图像质量方面均达到设计目标.