共查询到20条相似文献,搜索用时 31 毫秒
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为了更全面地评价显示器的色重显性能,用准积分法构建了人类视觉可感知三维色域.该算法用CIE标准色度观察者观察、混配等能单色辐射测得的CIE 1931 XYZ色度系统光谱三刺激值,按某一波长间隔求累加和,来近似实现未知函数表达式的多重积分运算.构建的色域囊括了人眼能识别的全部颜色,是宽色域、高动态范围显示设备的目标色域.还用三棱锥体积求和算法计算出该色域体积,验证了算法的可行性.进而由实测的LCD电视显示器数据,用同样方法计算其三维色域,并与视觉可感知三维色域进行定量比较.这些工作表明,本算法可为定量评价显示器的三维色域提供理论依据和可行算法,用这种方法给出的显示设备三维色域覆盖率可克服通常在二维色度图计算色域覆盖率的局限性. 相似文献
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A flat gas-discharge panel TV with good color saturation 总被引:2,自引:0,他引:2
《Electron Devices, IEEE Transactions on》1975,22(9):657-662
A flat 8-in diagonal gas-discharge color-TV has been fabricated and operated at 5 fL in white with a luminous efficiency of 0.05 lm/W. The contrast ratio was measured at better than 300:1, owing to the special configuration of the discharge cell, and also the careful adjustment of gas loading conditions. The CIE chromaticity coordinates for red, green, and blue (R,G,B) exhibited in the panel were, respectively, (0.56,0.31), (0.22,0.68), and (0,17,0.14)-- reasonably good values considering those of NTSC. The electrical and optical properties of the panel as well as the techniques for real-time TV picture display are discussed. 相似文献
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本文从CIE色度原理解释了LED显示系统的像素结构,利用LED显示系统混色理论,设计出基于四原色RGBW像素结构的LED显示系统电路,并论证了该电路在高效节能、减少光污染等方面的优势。 相似文献
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LED背光源现况与展望 总被引:1,自引:0,他引:1
现阶段,LED被广泛地应用到中小尺寸背光源中,大尺寸TV背光源也由原来的CCFL向LED转变。LED背光源的优势有低能耗、无汞环保、超薄化结构设计、高色彩饱和度、高品质画面显示,其应用领域广阔,几乎涵盖了中小尺寸、大尺寸显示应用领域。文章介绍了国内外LED背光源的标准体系建立情况,并根据当前产业面临的困难提出大尺寸LED背光源的发展方向。 相似文献
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《Display Technology, Journal of》2008,4(3):314-318
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LED背光对LCD色彩的影响 总被引:2,自引:2,他引:0
研究LED背光对液晶器件色彩的影响和CSTN及TFT—LCD白色色度坐标的变化规律,以及LCD的红、绿、蓝三色受LED背光的影响规律及色彩还原性的变化,并对背光发光光谱和液晶屏的透过光谱进行了测量比较。 相似文献
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通过试验研究了不同驱动电流下LED背光透过液晶器件时TFT-LCD白色色度坐标在驱动电流影响下的变化规律、LCD的红绿蓝3色辉度以及LCD色域与驱动电流变化的关系。实验结果表明液晶屏平均亮度和液晶屏中心RGB亮度随驱动电流呈线性变化,而液晶屏中心色域值几乎与驱动电流变化无关。 相似文献
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数字电视显示器的宽色域技术是显示领域的发展方向.近年来,宽色域显示器件和显示方式有长足进步,以发光二极管为背光源的液晶显示器等已商品化.采用三维色域测量方法,可以比传统测量方法更加准确地衡量产品的色域.提出了利用显示器宽色域色块校准方法,解决三维色域测量的准确性问题. 相似文献
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Lutao Li Yun Hu Yuan Chen Chen Wang Guoxiang Zhao Xinyu Du Chaoqiang Wang Lingbo Xiao Zheng Lu Jiong Wang Dan Wang Jiansheng Jie Jingsong Huang Guifu Zou 《Advanced functional materials》2023,33(29):2301205
High color purity is one of the important features for single-crystal metal halide perovskite light-emitting diode (LED). Despite single-crystal perovskite showing low bulk defect concentration, single-crystal perovskite LEDs do not exhibit high color purity advantage due to the absence of effective surface defect passivation. Herein, one fully wrapped structure is proposed to passivate the surface of the free-standing CsPbBr3 single-crystal films. The surface of CsPbBr3 single-crystal films is wrapped by ultra-thin polymethyl methacrylate, precisely controlling the thickness. The single-crystal perovskite film device can achieve high color purity with a full width at half maximum (FWHM) of 15.8 nm) and a large luminescent area of 2.25 mm2. It is observed that surface passivation is due to interaction of CO bond in polymer chains with the Lewis acid PbBr2. The passivated perovskite single-crystal films significantly improve carrier lifetime and suppress surface defects. It is noteworthy that the passivated free-standing single-crystal perovskite films are feasible to build up a vertical LED device structure, avoiding the edge glowing and short-circuiting of the LED device. This study demonstrates the large luminescent area of the high-quality millimetre-scale free-standing single-crystal films for wide color gamut display and vertical optoelectronic devices. 相似文献
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Unexpected Sole Enol‐Form Emission of 2‐(2′‐Hydroxyphenyl)oxazoles for Highly Efficient Deep‐Blue‐Emitting Organic Electroluminescent Devices 下载免费PDF全文
Bijin Li Guoqiang Tang Linsen Zhou Di Wu Jingbo Lan Liang Zhou Zhiyun Lu Jingsong You 《Advanced functional materials》2017,27(9)
Considerable efforts have been devoted to the development of highly efficient blue light‐emitting materials. However, deep‐blue fluorescence materials that can satisfy the Commission Internationale de l'Eclairage (CIE) coordinates of (0.14, 0.08) of the National Television System Committee (NTSC) standard blue and, moreover, possess a high external quantum efficiency (EQE) over 5%, remain scarce. Here, the unusual luminescence properties of triphenylamine‐bearing 2‐(2′‐hydroxyphenyl)oxazoles ( 3a–3c ) and their applications in organic light‐emitting diodes (OLEDs) are reported as highly efficient deep‐blue emitters. The 3a ‐based device exhibits a high spectral stability and an excellent color purity with a narrow full‐width at half‐maximum of 53 nm and the CIE coordinates of (0.15, 0.08), which is very close to the NTSC standard blue. The exciton utilization of the device closes to 100%, exceeding the theoretical limit of 25% in conventional fluorescent OLEDs. Experimental data and theoretical calculations demonstrate that 3a possesses a highly hybridized local and charge‐transfer excited state character. In OLEDs, 3a exhibits a maximum luminance of 9054 cd m?2 and an EQE up to 7.1%, which is the first example of highly efficient blue OLEDs based on the sole enol‐form emission of 2‐(2′‐hydroxyphenyl)azoles. 相似文献
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双通道PWM的冷暖白光LED混色模型研究 总被引:1,自引:0,他引:1
LED光色度的动态调节是实现智能照明的基础, 采用冷暖白光LED和双通道脉冲宽度调制(PWM)法,基于1931CIE标准建立混合光源模型,推导出混合光源色坐标、相关色温 、最大亮度、显色指数与双通道调制脉冲 占空比比值的关系式。采用暖白光(色温3282 K)和冷白光(色温12930K)两种白光LED进行 混色实验, 通过微控制器输出PWM信号控制LED驱动电源,改变冷色光和暖色光的比重,得到的混合 光源色坐 标、最大亮度、相关色温及显色指数值与理论计算值吻合很好,证明了理论模型的正确性。 理论和实验结 果还表明,混合光源在双通道调制脉冲占空比比值为1的附近可得到低色温、高显色性和大 光通量的混合白光。 相似文献