An improved two-stage model of colorimetric characterization for liquid crystal display （LCD） was proposed. The model included an S-shape nonlinear function with four coefficients for each channel to fit the Tone re...An improved two-stage model of colorimetric characterization for liquid crystal display （LCD） was proposed. The model included an S-shape nonlinear function with four coefficients for each channel to fit the Tone reproduction curve （TRC）, and a linear transfer matrix with black-level correction. To compare with the simple model （SM）, gain-offset-gain （GOG）, S-curve and three-one-dimensional look-up tables （3-1D LUTs） models, an identical LCD was characterized and the color differences were calculated and summarized using the set of 7 × 7 × 7 digital-to-analog converter （DAC） triplets as test data. The experimental results showed that the model was outperformed in comparison with the GOG and SM ones, and near to that of the S-curve model and 3-1D LUTs method.展开更多
提出了一种用于控制与保护开关电器的4~20 m A标准电流输出电路。阐述了基于脉宽调制技术实现数模转换的原理,在电路仿真的基础上设计了硬件电路,分析了电路的各个部分并详细讨论了实现脉宽调制输出的软件设计方法。对导致输出电流产生...提出了一种用于控制与保护开关电器的4~20 m A标准电流输出电路。阐述了基于脉宽调制技术实现数模转换的原理,在电路仿真的基础上设计了硬件电路,分析了电路的各个部分并详细讨论了实现脉宽调制输出的软件设计方法。对导致输出电流产生误差的因素作了进一步探讨,改进了相关器件选型,试验表明提高了电路精度和线性度。该电路抗干扰能力强、安全性高且比采用数模转换器实现方式的成本低,适合传输远程模拟量信号,可用于工业现场设备及自动化仪表的相关开发。展开更多
基金This work was supported by the National Nature Science Foundation of China under Grant No. 60578011.
文摘An improved two-stage model of colorimetric characterization for liquid crystal display （LCD） was proposed. The model included an S-shape nonlinear function with four coefficients for each channel to fit the Tone reproduction curve （TRC）, and a linear transfer matrix with black-level correction. To compare with the simple model （SM）, gain-offset-gain （GOG）, S-curve and three-one-dimensional look-up tables （3-1D LUTs） models, an identical LCD was characterized and the color differences were calculated and summarized using the set of 7 × 7 × 7 digital-to-analog converter （DAC） triplets as test data. The experimental results showed that the model was outperformed in comparison with the GOG and SM ones, and near to that of the S-curve model and 3-1D LUTs method.
文摘提出了一种用于控制与保护开关电器的4~20 m A标准电流输出电路。阐述了基于脉宽调制技术实现数模转换的原理,在电路仿真的基础上设计了硬件电路,分析了电路的各个部分并详细讨论了实现脉宽调制输出的软件设计方法。对导致输出电流产生误差的因素作了进一步探讨,改进了相关器件选型,试验表明提高了电路精度和线性度。该电路抗干扰能力强、安全性高且比采用数模转换器实现方式的成本低,适合传输远程模拟量信号,可用于工业现场设备及自动化仪表的相关开发。
