共查询到20条相似文献,搜索用时 230 毫秒
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投影机根据工作原理、光源和光输出量的区别,有不同的分类方式.投影机能效标准在能源效率测试方法上不需要考虑投影机的分类,统一测试方法为白场信号下产品光输出和功耗的比值.待机测试采用功率积分的方式进行测试.根据光输出的差异,统计近期投影机节能测试的结果,提出不同的能效指数限定值要求、待机功耗要求. 相似文献
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洪琦 《信息技术与标准化》2010,(5):26-28
以液晶显示器为例,介绍计算机显示器能效值的测试方法,分析显示器能效测试的不确定度来源,计算显示器能效值和显示器关闭方式下功耗的测试不确定度. 相似文献
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为打击能效虚标,提高能效数据一致性核验的评价能力,利用稳健统计Z比分数法描述测试数据.以平板电视的能源效率为例,介绍了Z比分数的构成、评价标准以及中位值、标准化四分位距等统计量的计算.结果表明,应用Z比分数进行能效数据一致性核验的数据统计处理,可以有效地识别能效备案实验室间存在的差异,提高能效检测的技术水平. 相似文献
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本文介绍了平板电视新能效的标准执行后,在电视机应用时,如何保证在电视机个性指标的前提下获得更高的能效指数,通过数据对比,总结出如何设定出厂设计,如何设定用户模式的自我调整。并通过对直下式液晶模组的测试,结合LED的不同电流下发光效率,给出具体的调光信号设定方案。 相似文献
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The application of DPCM to the coding of color television signals calls for the design of the quantization characteristics for the luminance and the two color difference components. In this paper we describe quantizer designs based on visibility thresholds of quantization noise measured as a function of prediction error for a number of test slides. We assume a quantizer for the luminance component designed previously by a similar procedure and conduct psychovisual tests for theU andV color components. The results show that, mainly for granular noise, there is some visual superposition of quantization noise between the luminance and theU chrominance signals, while little or no visual interaction is evident between the luminance and theV signal impairments. The quantizers for theU andV components are designed such that, with the previously designed luminance quantizer, the number of levels are minimized without exceeding the visibility thresholds. We conclude that a total of 6 bits per color sample are required to code theU andV components together at 4.4 MHz. 相似文献
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真空荧光显示器亮度特性的研究 总被引:3,自引:3,他引:0
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。 相似文献
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Aram Baek Daehyeok Gwon Sohee Son Jinho Lee Jung-Won Kang Hui Yong Kim Haechul Choi 《ETRI Journal》2021,43(2):313-323
The Joint Video Exploration Team (JVET) has studied future video coding (FVC) technologies with a potential compression capacity that significantly exceeds that of the high-efficiency video coding (HEVC) standard. The joint exploration test model (JEM), a common platform for the exploration of FVC technologies in the JVET, employs quadtree plus binary tree block partitioning, which enhances the flexibility of coding unit partitioning. Despite significant improvement in coding efficiency for chrominance achieved by separating luminance and chrominance tree structures in I slices, this approach has intrinsic drawbacks that result in the redundancy of block partitioning data. In this paper, an adaptive tree structure correlating luminance and chrominance of single and dual trees is presented. Our proposed method resulted in an average reduction of −0.24% in the Y Bjontegaard Delta rate relative to the intracoding of JEM 6.0 common test conditions. 相似文献
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Improvement of color temperature using independent control of red, green, blue luminance in AC plasma display panel 总被引:1,自引:0,他引:1
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. 相似文献
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针对目前液晶显示屏在低灰阶下显示不均匀的问题,对基于图像处理的亮度矫正方法在液晶显示屏中的改善进行了实验。基于高精度超暗亮度CCD采集器,采集液晶显示屏在低灰阶下单个像素的亮度信息及Gamma曲线数据,并逐个像素进行矫正。重点介绍了该采集系统与其他采集设备的优势及亮度和云纹矫正算法,试验结果表明:该采集系统可以一次完成所有像素的亮度信息的采集,并能有效分辨各像素点的亮度,理论上均匀度可以提高到100%,在正常显示状态下,可以独立实时地对每一帧画面进行矫正,确保显示信息的真实性。 相似文献
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最小可觉差是人眼视觉重要特性之一,随着计算机显示器的普及,显示器环境下的亮度最小可觉差对图像细节有重要的应用价值。利用10bit图像显示卡和液晶显示器方便、精确控制亮度刺激,在显示器显示亮度范围内产生27个不同亮度背景,采样心理物理学亮度视觉匹配实验测得亮度最小可觉差。实验结果表明,在背景亮度为11.89~142.3cd/m~2中等亮度下人眼最小可觉差与背景亮度的比值约为0.017,并遵守韦伯定律;在背景亮度为0.38~9.36cd/m~2的弱亮度情况下,人眼最小可觉差与背景亮度的比值随亮度的增加呈单调递减趋势。在显示器上测量的中等亮度下人眼亮度最小可觉差与Koenig and Brodhun采用传统光学方法得到的实验结果基本一致。 相似文献
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对碳纳米管阴极的制备以及场发射显示器的真空封装技术进行了研究.利用一种新的碳纳米管生长工艺制备出了具有优良场发射性能的碳纳米管阴极.并将这种直接生长的碳纳米管薄膜作为阴极,结合一种弹性封装工艺,开发了一种具有简单字符显示功能的场发射显示器.该显示器在较低的工作电压下就可获得高亮度的显示效果,并且器件的亮度与驱动电压成较好的线性关系,这将有利于未来的碳纳米管场发射显示器实现高亮度和多级灰度显示.器件的持续工作寿命测试已经超过5500小时,充分验证了碳纳米管作为场发射阴极的应用潜力. 相似文献
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Joon-Young Choi Dong-Hyun Kim Ho-Jun Lee Lee H.J. Chung-Hoo Park 《Electron Devices, IEEE Transactions on》2005,52(9):1988-1992
A possible method to control luminance of a whole panel in an ac plasma display panel (PDP) is to control a total number of sustain pulses which is called as gray level control. However, this method leads to rough step-like luminance control especially in the low gray level. In this paper, a simple and robust luminance control method of whole panel is proposed. The key feature of the proposed driving technique is application of asymmetric amplitude modulation of sustain pulses in the display period of the address, display-period separation (ADS) driving scheme. As a result, the range of luminance control by the proposed method is about 50% of the luminance for a given gray level. Moreover, it is experimentally verified that the proposed method has similar dynamic margin performances compared with the conventional method. 相似文献