基于酞菁类和二亚铵类近红外吸收染料的等离子显示器滤光膜的性能对比研究

等离子显示器中的潘宁气体在放电过程中会产生近红外线、氖黄光,干扰遥控器等设备,影响观看效果,需安装滤光膜。文章对以酞菁类、二亚铵类为近红外吸收染料的PDP滤光膜进行了对比研究,实验结果表明,酞菁类、二亚铵类滤光膜具有良好的耐湿热、耐高温性能,二亚铵类滤光膜相对于酞菁类滤光膜具有较好的光稳定性能,且可见光区透过率可达到60%以上,适合应用于高透过率PDP滤光膜。     

透过率实时可调的PDP屏滤光膜

利用NiOx薄膜具有优良的电致变色性能,制备了透过率可实时调整的PDP屏滤光膜以提高PDP屏的出光效率,在不同环境照度下获得更好的图像质量。采用扫描电镜(SEM)、X射线衍射仪(XRD)、分光光度计研究了采用磁控溅射法制备的NiOx薄膜中镍的含量对薄膜光电特性的影响。分析测试结果表明:溅射时随着氧分压的提高,氧化镍薄膜的镍含量明显降低;NiOx薄膜中镍原子含量为45%左右时,NiOx薄膜对可见光透过率的调节能力最强,其最高透过率与最低透过率差值达70%。     

基于一维光子晶体的1064 nm激光窄带滤光膜的设计

为了获取具有宽截止带的1064 nm激光窄带滤光膜,本文以含缺陷的一维光子晶体为基础设计了两种不同的结构。模拟分析了缺陷层引入方式、缺陷层光学厚度、缺陷层材料折射率、光子晶体周期数和缺陷层位置等因素对窄通带位置、宽度和强度的影响,明确了其影响规律。通过优化光子晶体的结构参数优化滤光膜窄通带、拓宽截止带,设计了截止范围在200～1500 nm、1064 nm透过率大于90%的多层结构滤光膜。     

InGaAs探测器片上集成滤光膜的微结构与性能

为了适应未来红外焦平面探测器系统小型化、集成化和高精度的发展要求,采用了热蒸发方法分别在InP衬底和InGaAs探测器上实现了中心波长为1.38μm滤光膜的片上集成。利用偏光显微镜、原子力显微镜(AFM)和扫描电子显微镜(SEM)以及红外傅里叶光谱(FTIR)等实验手段研究了滤光膜的表面界面形貌和光学性能,结果显示,滤光膜为法布里-珀罗三谐振腔结构,与膜系设计一致;滤光膜中心波长为1.38μm,透射率在60%左右。对集成滤光膜InGaAs器件的电学和光学性能测试分析表明,滤光膜制备工艺对器件的电流电压特性和噪声基本没有影响;而集成滤光膜器件的响应要优于滤光膜分离器件的性能。     

可见/红外双波段阵列式滤光片设计与制作工艺研究

双波段阵列式滤光片是集成式可见,红外双波段传感器的核心部件,分别采用干涉截止滤光方法和干涉吸收滤光法设计了蓝宝石衬底上红外和可见光波段的滤光膜系,实际测量两个波段的滤光膜的平均透过率均达到90%以上.同时采用光刻、电子束蒸发镀膜和剥离工艺完成了滤光片的制作.     

自由空间激光通信系统中多通道滤光膜的研制

激光通信作为一种通信手段,以其抗干扰能力强、保密性好、功率集中等优点,在军事和民用等领域得到广泛应用。为满足激光通信系统使用要求,提高信噪比,对系统中的滤光膜进行研制。选用Ti3O5和Si O2作为镀膜材料,依据倍频设计和双波长增透原理完成了三带通、宽反射带滤光膜的设计。通过膜厚缩放比例和逆向工程方法分析膜厚累积误差,重点解决了膜厚监控误差大的问题。制备的滤光膜在532 nm和1064 nm处透射率大于90%,808 nm处透射率大于85%,(1550±20)nm处透射率小于0.4%,满足该系统环境测试要求。     

彩色液晶显示用彩色滤光膜的制备及其性能的研究

利用可溶性高聚合物和光感剂材料,采用染色法制成了用于彩色液晶显示的彩色滤光膜,并对其进行了光学与色度特性的测量。结果表明,用光刻剂技术研制的彩色滤光膜基本上达到了彩色液晶显示的设计要求,一系列三基色的x、y值可以满足不同使用条件对色度的需要。     

红外探测器光学系统滤光膜的研制

为了提高红外探测器的灵敏度,针对红外探测器元件滤光膜的技术要求,采用Si和YbF3的膜料组合,依据薄膜理论,设计干涉截止滤光膜,满足了3个波段对光学性能的要求,并且在实际制备过程中优化了工艺参数,包括温度、蒸发速率以及离子源辅助沉积参数。通过多次实验研究,对设备的本身误差进行分析修正,提高了膜层厚度控制精度,在蓝宝石基底上成功镀制了1 064 nm透射率为91.5%、1 200～2 900 nm平均反射率大于97%、3 000～5 000 nm平均透射率为93%的3波段干涉截止滤光膜,给出了综合测试结果和实测光谱曲线。     

3.7～4.8μm中红外带通滤光膜研制

以光学薄膜理论为出发点,系统介绍了3.7～4.8 m带通滤光膜的理论设计与优化、实际生产制备以及成品测试方法。考虑到膜料性能及膜层匹配等问题,分别选用锗和一氧化硅作为高低折射率材料,并以氧化铝作为薄膜基底。确定了滤光膜的基础膜系,并使用Filmaster软件对膜系进行了设计和优化计算。在薄膜蒸镀过程中,根据材料选取合适的镀制工艺。通过温度控制、离子辅助等方法研制出了可靠性与光谱特性皆优的带通滤光膜,并对其光谱特性及膜层质量等进行了测试。根据设计目标修改工艺参数,最终确定可行的工艺流程,从而研制出了符合光学性能设计指标的3.7～4.8 m带通滤光膜。     

新型数字显示设备基础知识(二)

三、PDP等离子体显示器关键概念:PDP,发光效率,ALIS,华夫饼干结构,疑似轮廓基本结构:PDP的中文名称为等离子体显示板,它是利用气体加热到等离子状态会放电发光的原理来显示图像的一种设备。PDP最适合大画面利用,也是画面尺寸最早超过CRT的直视式电视。PDP像素点的发光原理与家用荧光灯基本相同。在备有电极的两块玻璃板间封入氖(Ne)和氙(Xe)气体。玻璃基板的内侧布涂有R、G、B三原色荧光粉。     

彩色等离子体显示板的彩色重现

叙述了影响彩色ＰＤＰ彩色重现的因素,其中主要因素是荧光粉的色度值和排列情况,其次是单元的结构、滤色膜、黑色矩阵、驱动电路和障壁等。     

彩色平板等离子体显示器(PDP)用基板玻璃

本文分析了普通钠钙玻璃不能作为大面积彩色ＰＤＰ基板玻璃的原因,指出大面积ＰＤＰ最终应用的基板玻璃必将是与现已开发应用的、与彩色ＰＤＰ相关材料匹配的,但其应变点温度高于彩色ＰＤＰ制造过程中最高热处理温度的玻璃,同时提出了一种在ＰＤＰ制造过程中减小普通钠钙玻璃热变形的方法。最后从浮法玻璃的制造方法和特点出发,指出彩色ＰＤＰ制造工艺中,应特别区分浮法玻璃的正反面。     

新型荫罩式PDP放电单元谐振光子辐射和捕获过程研究

本文在流体模型计算的基础上采用蒙特卡罗模型,研究了彩色等离子体平板放电单元中的辐射和捕获过程.研究了新型荫罩式等离子体显示器(SMPDP)和传统的交流表面放电等离子体显示器(ACC PDP)的放电过程以及谐振光子的辐射和捕获特性.给出了电子及氙谐振态平均浓度以及相应空间浓度分布随时间变化情况.模拟了谐振光子和147谱线的分布情况.可以看到SMPDP的发光效率高于表面放电结构.     

A novel energy-recovery sustaining driver for plasma display panel

A novel energy-recovery driver is proposed to drive a plasma display panel (PDP) in the sustaining operation. The proposed circuit uses the parallel resonance between the inductor and the intrinsic capacitance of PDP to mainly recover the energy lost by the capacitive displacement current of the PDP. The parasitic resonance caused by the parasitic inductance and the stray capacitance is prevented greatly. A 34-in AC PDP equipped with the proposed driving circuit, operated at 100 kHz, is investigated. In addition, some prior work is shown in this paper for comparison, in which the power consumption of driving the same 34-in panel is measured. The experimental results show that the proposed driver has a low-cost structure and better performance than the prior ones.     

Energy-recovery circuit for plasma display panel

A new energy-recovery circuit for a plasma display panel (PDP) is proposed. It features a simpler structure, less mass, higher efficiency, and fewer devices. The very stable and uniform light emitted from a PDP proves the high quality of the screen. It is suitable for hang-on-the-wall TVs which have desirable features such as thinness, lightness, high efficiency, and low price     

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.     

Novel gate-overlap tunnel FET based innovative ultra-low-power ternary flash ADC

This paper presents a highly efficient ternary flash ADC, designed using the innovative gate-overlap tunnel FET (GOTFET) at the 45 nm technology node. The proposed GOTFETs have on-state currents I_on more than double, while the off-state currents I_off remaining at least an order of magnitude lower than the corresponding values of the standard 45 nm CMOS technology with the same width. Replacing MOSFETs with the proposed GOTFETs significantly reduces the static power consumption and improves performance. However, the higher I_on increases the dynamic power as well. To minimize the dynamic power, we propose a novel complementary GOTFET (CGOT) based comparator design. In addition to the inherent advantages of the GOTFET technology, the proposed design further reduces the dynamic power, such that the final power delay product (PDP) is merely 6.3% of the PDP in conventional CMOS comparator design. In addition to the novelty related to the innovative GOTFET devices, there are at least two-fold circuit-level novelty reported in this work. Firstly, we propose a novel CGOT based comparator circuit design, which, in addition to the advantages of GOTFET, further reduces the dynamic power such that the PDP is less than 1/3rd of the original PDP of the conventional comparator designed with GOTFETs. Secondly, the proposed CGOT based ADC requires only 48 transistors to encode the comparator outputs into the 2-bit ternary output, which is 30% lower than the 70 transistors necessary for the 2-bit CMOS based ternary flash ADC designs reported earlier in the literature. We propose an efficient 2-bit ternary flash ADC with a resolution of 50 mV and input quantized to 9 levels. Subsequently, we benchmark the performance of the proposed CGOT ternary flash ADC with the same ADC circuit implemented using the standard 45 nm CMOS technology library, all corresponding devices having the same width. We demonstrate that in addition to the superior performance than the corresponding CMOS ADC, the proposed CGOT ADC design consumes significantly lower power. The overall PDP of the proposed CGOT ADC is merely 6.3% of the PDP in corresponding CMOS design.     

Pilot-Based LMMSE Channel Estimation for OFDM Systems With Power–Delay Profile Approximation

In linear-minimum-mean-square-error (LMMSE) channel estimation for multicarrier systems, one needs to know the channel correlation function. This poses a problem for systems with a small number of pilots operating in time-varying channels. We propose to approximate the channel power–delay profile (PDP) with a shape that can completely be described in two parameters, namely, the mean delay and the root-mean-square (RMS) delay spread. Furthermore, we develop a simple technique to estimate these delay parameters. The approximate PDP is then used to generate the LMMSE filter coefficients for data-subcarrier channel estimation. Mathematical expressions are derived that can be used to predict the accuracy of the various estimates, and they are verified by simulation. The proposed technique is applicable to both point-to-point communication and multiaccess communication where different users may experience different channel conditions. As a practical application, we also specialize the proposed technique to Mobile WiMAX signals and investigate the resulting performance.