一种新的AC PDP低灰度级图像增强方法及SoC实现

为增强交流等离子体显示器(AC PDP)中经过反Gamma校正后的低灰度级图像,在图像进行反Gamma校正后,根据图像原始灰度与二进制编码灰度之差建立浮动灰度编码.然后利用误差扩散方法将浮动灰度编码所包含的低灰度级图像信息融合到用于显示的子场编码中.同时提出了采用并行流水线结构进行该方法的在系统芯片(SoC)实现.仿真及实验结果表明,本文提出的新方法补偿了反Gamma校正后损失的低灰度图像信息,有效地改善了AC PDP低灰度级图像质量,并且该方法的SoC实现具有良好的实时处理性及较高计算精度,且占用系统资源较少.     

Sc2O3掺杂及其工艺参数对MgO介质保护膜性能的影响

MgO介质保护膜掺杂可以改变其性能，基于这一现象，本文利用电子束加热蒸镀法，在多种掺杂比和多种工艺条件下制备了MgO介质保护膜和宏单元气体放电屏。利用扫描电子显微镜（SEM）对制备的复合介质保护膜样品的进行了微观表征，并且，利用宏单元气体放电实验屏研究了介质保护膜的气体放电特性。结果表明：与纯Mg0介质保护膜相比，掺杂Sc2O3的介质保护膜具有较好的性能。     

A New Method for Measuring the Wall Charge Waveforms of AC PDP

A new method is developed to measure the wall charge waveforms in coplanar alternating current plasma display panel (AC PDP). In the method, two groups of display electrodes are selected from a coplanar AC PDP and two capacitors are respectively connected with thesetwo groups of display electrodes in series, and a measuring circuit and a reference circuit are thus constructed. With the help of special processing, discharge takes place in the cells included in the measuring circuit under a normal drive voltage but no discharge takes place in the cells included in the reference circuit under a normal drive voltage. The wall charge waveforms are obtained from the voltage difference between the two capacitors. Using the method, the wall charge waveforms are measured during resetting period, addressing period and sustaining period for the 304.8 mm (12-inch) test PDP panel. The result shows that the wall voltage is about 96 V during the sustaining period.     

A Volume-Weighting Cloud-in-Cell Model for Particle Simulation of Axially Symmetric Plasmas

A volume-weighting cloud-in-cell (VW-CIC) model is developed to implement the particle-in-cell (PIC) simulation in axially symmetric systems. This model gives a first-order accuracy in the cylindrical system, and it is incorporated into a PIC code. A planar diode with a finite-radius circular emitter is simulated with the code. The simulation results show that the VW-CIC model has a better accuracy and a lower noise than the conventional area-weighting cloud-in-cell (AW-CIC) model, especially on those points near the axis. The two-dimensional (2-D) spaze-charge-limited current density obtained from VW-CIC model is in better agreement with Lau‘s analytical result. This model is more suitable for 2.5-D PIC simulation of axially symmetric plasmas.     

增强AC PDP低灰度级图像的子场抖动方法

为增强交流等离子体显示器(AC PDP)中低灰度级图像的显示效果,提出了一种子场抖动方法。该方法根据ACPDP采用子场方法显示灰度的特点,利用一种新型阈值矩阵对AC PDP中权重较小的两个子场分别进行抖动处理。同时,设计实现了子场抖动电路,并将其与传统误差扩散电路分别应用于32英寸AC PDP上进行测试。实验结果表明,子场抖动方法在表达低灰度级图像时无条纹状噪声,对低灰度级图像的增强效果优于传统误差扩散方法。     

强流离子束的最佳聚焦

在同时考虑束流发射度和空间电荷效应情况下,推导出了轴对称强流离子束的最佳聚焦条件,并根据数值计算结果,绘制出了最佳聚焦条件下确定束腰半径、束腰位置和固定靶上最小束半径的通用关系曲线。     

加速器非线性动力系统方程任意阶近似解析解

用严格的分析方法获得了普遍的非线性动力系统方程的任意阶近似解析解,从而解决了加速器动力学和带电粒子光学中长期未能解决的任意阶象差系数解析解的难题。     

Zr含量对磁控溅射Mg-Zr-O薄膜微观结构和放电性能的影响

采用磁控溅射在玻璃基底上沉积Mg-Zr-O 复合介质保护膜,研究Zr掺杂含量对薄膜微观结构和放电性能（着火电压,最小维持电压）的影响。结果发现,沉积的Mg-Zr-O薄膜晶粒细小,微观结构仍然保持MgO的面心立方NaCl型结构,所掺杂的Zr以Zr4+形式置换固溶于MgO晶格中。当掺杂Zr浓度为2.03at%时,薄膜具有最强的（200）择优取向和最小的表面粗糙度。适当Zr掺杂的Mg-Zr-O薄膜和纯MgO薄膜相比,其着火电压和最小维持电压分别降低了25和15 V。     

表面放电AC—PDP放电特性的数值模拟

给出一种数值模拟的方法,来研究表明放电型AC－PDP的放电单元结构参数对着火电压的影响。通过这种方法,研究了放电单元结构参数,如放电间隙宽度、电极宽度、障壁高度、绝缘介质层厚度、介质层的介电常数以及寻直电极偏压等对着火电压的影响。所得结果有助于优化表面放电AC－PDP放电单元的结构设计。