Mixed Color Sequential Technique for Reducing Color Breakup and Motion Blur Effects

This paper proposes a mixed color sequential (MCS) algorithm with high contrast enhancement technique in RGB light-emitting diode (LED) backlight display. Owing to synchronous control of liquid crystal display (LCD) and LED panels, high quality image with suppressed color breakup (CBU) and motion blur effects is achieved by our novel color sequential technique. Importantly, MCS algorithm is useful for color filter-less optical compensated bend (OCB) panel display for alleviating CBU and motion blur effects. Furthermore, high contrast image is also presented on LCD panel because of mixed red-green-blue (RGB) and cyan-magenta-yellow (CMY) backlights with optimum power consumption. In other words, MCS algorithm with high contrast enhancement technique can have the better performance compared with other field sequential color techniques. Experimental results demonstrate by an actual RGB backlight module for 32-in 1366*768 LCD panel the improvement of CBU and motion blur effects.     

场时序彩色液晶显示器技术

场时序彩色液晶显示器(FSC-LCD)具有响应速度快、亮度高、彩色性能好、成本低等特点,代表了未来高端液晶显示器的发展方向.主要从基本原理、实现方法和相关材料等方面介绍了FSC-LCD的关键技术及发展趋势.     

LED背光源用于场序彩色LCD的研究

以红色LED材料AlGaInP，绿色和蓝色LED材料InGaN三芯合一的全彩LED为研究对象，通过大量实验及所测数据，研究用高密高位LED作场序彩色液晶显示器背光源，在不同情况下形成的彩色对人眼的视觉影响；研究在不同场频和不同占空比情况下，LED的发光特性曲线，确定白平衡情况下LED三基色的等量关系；研究LED三基色形成的白光光谱与三基色各光谱之间的关系；比较LED三基色与电视系统三基色在色度图上所覆盖的彩色范围，确定LED管子的选择方法及使用注意事项。     

场序彩色液晶显示器用LED背光源的研究

通过比较光谱曲线和色坐标,指出如何选用场序彩色液晶显示器中的LED三基色光源,从而使场序彩色液晶显示器能正确复现彩色电视机所能复现的彩色。     

彩色液晶显示器控制电路研究

介绍了７．６ｃｍ彩色液晶显示样机实现动态视频图像显示的控制电路的设计方法。     

用于设备控制的双核驱动智能彩屏

本智能彩屏终端系统采用双核控制的方式使用C语言进行软件编程,解决了目前工控领域如何快速、低成本地从单色STN/FSTN液晶屏升级到真彩色TFT液晶屏的问题。     

LCD显示器传输系统的抗噪声技术研究

随着LCD模块在多媒体显示系统中的广泛应用,由于系统对LCD的分辨率要求不断提高及显示丰富多彩的视频信息,使系统频率也变得越来越高。当系统的频率超过40MHz时,用传统的采用滤波器的方法来抑制EMI和ESD的技术也达到其应用极限。文章根据系统的特点提出采用DC均衡的差分传输技术和数据处理技术的结合方法来抑制系统的EMI。文章提出的控制EMI的技术是首先对传输数据进行处理,使处理后的数据基本趋近于0,并将已处理的数据以DC平衡的差分方式进行传输。文章提出的技术提高了LCD模块的传输的抗干扰能力,适合于折叠式手机主板与LCD模块之间的数据传输。     

Adaptive Digital Feedback Predistortion Technique for Linearizing Power Amplifiers

We have developed a new adaptive digital predistortion (DPD) linearization technique based on analog feedback predistortion (FBPD). The lookup-table-based feedback input can remove the bandwidth limitation of the feedback circuit related to the loop delay, and suppress feedback oscillation by accurate digital control of the feedback signal. Moreover, the predistortion (PD) signal can be extracted very efficiently. By combining the feedback linearization and DPD linearization techniques, the performance of the predistorter is enhanced significantly compared to the conventional DPD. To clearly visualize the characteristics of digital FBPD (DFBPD), we have compared it to the conventional DPD based on the recursive least square algorithm using Matlab simulation. The results clearly show that the new method is a good linearization algorithm, better than a conventional DPD. For the demonstration, a Doherty power amplifier with 180-W peak envelope power is linearized using the proposed DFBPD. For a 2.14-GHz forward-link wideband code-division multiple-access signal, the adjacent channel leakage ratio at 2.5-MHz offset is -58 dBc, which is improved by 15 dB at an average output power of 43 dBm     

Two-Field Scheme: Spatiotemporal Modulation for Field Sequential Color LCDs

A novel displaying method, two-field driving scheme, was proposed for field sequential color LCDs without color filter. A spatially modulated color backlight provided multi-primary low-resolution optical stimuli, which were then compensated by an LC panel to display detailed colorful images. That is, the manipulation on three (or more) spatial and two temporal degrees of freedom was sufficient to convey full color information. The simulation results showed that the proposed method achieved acceptable color reproduction accuracy, average CIEDE2000 color difference (DeltaE₀₀) < 3. The least number of fields particularly alleviated the demand for fast-response LC modes in sequential-type LCDs. Furthermore, color break-up suppression was observed due to less chrominance difference between the two fields.     

Adaptive Control Technique for Artificial Hearts

This paper is concerned with an adaptive control technique for artificial hearts. The design control strategy is multiobjective: aortic pressure control, atrial pressure control, and pump output flow rate control. A desired control mode can be chosen frQm a console.     

高亮度LCoS微显示器的接口设计

为了提高LCoS微显示器的亮度，提出了双拍存储伪并行的驱动方式，设计了适用于高亮度LCoS微显示器的接口ASIC（专用集成电路），从而使LCoS微器的亮度可以提高数倍，并获得了更小的接口尺寸和更低的功耗。     

Sleep Transistor Sizing and Adaptive Control for Supply Noise Minimization Considering Resonance

The conventional sleep transistor sizing schemes do not consider the resonant supply noise which represents the worst-case supply disturbance. This paper investigates the impact of sleep transistor sizing on different on-chip noise components and shows that, contrary to the conventional wisdom, a larger sleep transistor is not always favored in term of performance when the resonant supply noise is taken into account. To minimize the worst-case supply noise, an optimal sizing scheme using an explicit noise and impedance model is developed and verified by benchmark circuits. Employing the proposed technique results in a reduction of the worst-case noise by 19%, as well as a saving of standby leakage and area overhead by 60% in comparison with conventional sizing scheme. In order to deal with the sporadic nature of the resonant, we propose an adaptive sleep transistor circuit which adjusts the size of sleep transistor on the fly to remove the DC noise penalty of the fixed sizing scheme. Simulation results on 32-nm CMOS technology are used to demonstrate the functionality and effectiveness of the proposed adaptive sizing circuits.      

应用于LCD控制器的动态抖动算法及帧速率控制技术

文章提出了应用于液晶显示(LCD)控制器的动态抖动算法及帧速率控制技术。抖动算法极大的改善了显示图象的平滑度，帧速率控制技术大大增加图象灰度而明显降低图象的抖动和赝象。结果显示在LCD控制器中采用动态抖动算法及帧速率控制技术，如果每一象素数据的位宽是8比特，则单色图象的显示效果可高达256级灰度，彩色图象高达256^3彩色。     

A Linear-State Feedback Plus Adaptive Feed-Forward Control for DC Servomotors

This paper proposes a linear-state feedback plus adaptive feed-forward control to control position for DC servomotors. The aim is to control DC servomotors submitted to inertia and Coulomb friction variations. Conditions for stability depending on the frequency richness of the reference input are presented. Experimental results show the improvement with respect to classical tachometric feedback.     

一类MIMO非线性系统的自适应模糊输出反馈控制

针对一类MIMO非线性状态不可测系统,提出了一种稳定的基于观测器的自适应模糊控制方法.该方法不需要系统状态可测的条件,而是通过设计模糊观测器来估计系统的状态.证明了所提出的控制方法可保证闭环系统的稳定性和跟踪误差的收敛性.仿真结果进一步验证了该控制方法的实用性和有效性.     

A Technique for Adaptive Voice Flow Control in Integrated Packet Networks

Integrated packet-switched networks have potential for providing improved performance by dynamically sharing transmission bandwidths between various users and user types, but new flow control methods are needed to deal with packetized voice traffic. This paper describes a packet voice flow control concept based on embedded speech coding. Results are presented from a computer simulation study of the technique in the context of a multilink wideband packet speech network. Several control methodologies are described, leading to an end-to end feedback approach that achieves stable operation and efficient utilization of network resources by adaptively matching transmitted voice bit rates to prevailing network conditions. Issues in the design of embedded speech coding algorithms are reviewed and a candidate structure based on channel vocoding principles is presented, along with the subjective results of some preliminary listening tests     

Adaptive Resource Management in Mobile Wireless Networks Using Feedback Control Theory

Emerging mobile wireless networks are characterized by significant uncertainties in mobile user population and system resource state. Such networks require adaptive resource management that continuously monitor the system and dynamically adjust resource allocations for adherence to the desired system performance requirements. We propose adaptive resource management technique based on control theory. The controller dynamically solves resource allocation problem using feedback control laws. In the base algorithm, the number of guard channels is dynamically adjusted by feeding back the current handoff call dropping probability. The base algorithm is then enhanced in two ways: feeding back the instantaneous number of handoff calls and by probabilistically implementing a fractional number of guard channels. We study the effects of parameter choices on the performance of the proposed algorithms using discrete event simulation. Simulation results indicate that the feedback controllers can guarantee the predetermined call dropping probability under a variety of traffic conditions, and so can utilize the scarce wireless resource efficiently by accepting more new calls.     

四频差动激光陀螺自适应程长控制技术

为了减小四频差动激光陀螺(FMDLG)对外界干扰的敏感性,设计了自适应程长控制系统使之工作于最佳工作点。对FMDLG的程长进行小抖动正弦调制,利用相敏检波技术从光强中提取调制信号的基波和二次谐波幅度。上述两个信号和光强一起用来实现自适应程长控制,它包括自动增益控制、自动调制幅度控制和程长控制3个环路。实验表明,自适应控制可有效消除光学和电子元件参量以及光强变化对控制系统的影响,而且可使FMDLG稳定地工作在最佳工作点上,从而降低其磁灵敏度。     

一种基于NACK的HSDPA自适应信道质量反馈技术

作为一种B3G技术，HSDPA已经受到广泛的关注，该技术可以提供高速的分组下行数据传输。其关键技术包括AMC，HARQ，FCS等。在HSDPA系统中，其调制方式和编码可以随着下行链路的质量状况自适应改变。因此，信道质量反馈就直接影响AMC的准确度和系统的性能。本文介绍了TD—SCDMA模式下HSDPA中CQI的工作机制和一种基于NACK的自适应信道质量反馈技术。