A two-stage driving circuit of a one-chip TFT-LCD driver IC for portable electronic devices is proposed. The driving buffers of the new circuit are built in the γ-correction circuit rather than in the source driver. ...A two-stage driving circuit of a one-chip TFT-LCD driver IC for portable electronic devices is proposed. The driving buffers of the new circuit are built in the γ-correction circuit rather than in the source driver. The power consumption,die area, and driving capability of the driving circuit are discussed in detail. For a two-stage driving circuit with 13 driving buffers, the settling time of the driving voltage within 0.2% error is about 19.2μs when 396 pixel-loads are driven by the same grayscale voltage. The quiescent current of the whole driving circuit is 518μ~A,and the power consumption can be reduced by 77%. The proposed driving circuit is successfully applied in a 132RGB × 176-dot,260k color one-chip driver IC developed by us for the TFT-LCD of mobile phone, and it can also be used in other portable electronic devices, such as PDAs and digital cameras.展开更多
为提高电机系统测试效率及降低测试成本和风险,提出了回馈制动运行状态无刷直流电机(brushless DC motor,BLDCM)功率级实时仿真方法.该方法以功率级电流源模拟真实BLDCM绕组,可与电机驱动器交互电功率.采用双线性变换和逆Z变换方法推导...为提高电机系统测试效率及降低测试成本和风险,提出了回馈制动运行状态无刷直流电机(brushless DC motor,BLDCM)功率级实时仿真方法.该方法以功率级电流源模拟真实BLDCM绕组,可与电机驱动器交互电功率.采用双线性变换和逆Z变换方法推导了基于线电压的虚拟BLDCM数值模型,分析了功率级虚拟BLDCM回馈制动过程的电流路径以及电压和电流关系,给出了回馈制动运行时数值模型所需虚拟绕组线电压的获取方法.构建了功率级虚拟BLDCM实验平台,并进行了回馈制动实时仿真.应用MATLAB软件进行了BLDCM回馈制动的离线仿真以验证实验结果的准确性.结果表明,该方法无须改变驱动器硬件结构,可准确模拟BLDCM的稳态和瞬态过程,有效实现BLDCM回馈制动功率级实时仿真.展开更多
随着TFT-LCD在尺寸、分辨率及刷新率方向的飞速发展,优质的显示品味对时序控制器(T-CON)和特定源极驱动芯片(SD)之间的传统接口传输协议速率提出了挑战,因此成为TFT-LCD发展的关键。为了实现数据信号的高速传输,本文研究并提出了一种新...随着TFT-LCD在尺寸、分辨率及刷新率方向的飞速发展,优质的显示品味对时序控制器(T-CON)和特定源极驱动芯片(SD)之间的传统接口传输协议速率提出了挑战,因此成为TFT-LCD发展的关键。为了实现数据信号的高速传输,本文研究并提出了一种新型高速点对点接口传输协议CSPI(China Standard Point-to-Point Interface)。CSPI通过嵌入式的CDR(Clock Data Recovery)机制实现T-CON和SD之间时钟校准,CDR校准完成后,指令信号LS输出高电平并反馈发送端T-CON,通知T-CON可以传输下一阶段有效数据,同时,CSPI技术特定封装包对位数据嵌入传输数据线中。数据传输采用特有的8位/9位编码和扰码技术以实现数据快速而不失精准的传输。相对于传统mini-LVDS接口协议,CSPI技术的传输速率可以提升至3Gb/s,有效减少传输线数量,同时大幅提升信号传输质量。此外,CSPI时钟信号内置,可以有效降低EMI。基于1 383mm(55in)超高清液晶显示屏的实验结果表明,眼图的最小幅度和宽度分别约为312mV和548ps。可以满足系统对传输信号稳定性,可靠性和抗干扰能力的要求,同时减少印刷电路板(PCB)布局面积,有利于降低成本。展开更多
文摘A two-stage driving circuit of a one-chip TFT-LCD driver IC for portable electronic devices is proposed. The driving buffers of the new circuit are built in the γ-correction circuit rather than in the source driver. The power consumption,die area, and driving capability of the driving circuit are discussed in detail. For a two-stage driving circuit with 13 driving buffers, the settling time of the driving voltage within 0.2% error is about 19.2μs when 396 pixel-loads are driven by the same grayscale voltage. The quiescent current of the whole driving circuit is 518μ~A,and the power consumption can be reduced by 77%. The proposed driving circuit is successfully applied in a 132RGB × 176-dot,260k color one-chip driver IC developed by us for the TFT-LCD of mobile phone, and it can also be used in other portable electronic devices, such as PDAs and digital cameras.
文摘为提高电机系统测试效率及降低测试成本和风险,提出了回馈制动运行状态无刷直流电机(brushless DC motor,BLDCM)功率级实时仿真方法.该方法以功率级电流源模拟真实BLDCM绕组,可与电机驱动器交互电功率.采用双线性变换和逆Z变换方法推导了基于线电压的虚拟BLDCM数值模型,分析了功率级虚拟BLDCM回馈制动过程的电流路径以及电压和电流关系,给出了回馈制动运行时数值模型所需虚拟绕组线电压的获取方法.构建了功率级虚拟BLDCM实验平台,并进行了回馈制动实时仿真.应用MATLAB软件进行了BLDCM回馈制动的离线仿真以验证实验结果的准确性.结果表明,该方法无须改变驱动器硬件结构,可准确模拟BLDCM的稳态和瞬态过程,有效实现BLDCM回馈制动功率级实时仿真.
文摘随着TFT-LCD在尺寸、分辨率及刷新率方向的飞速发展,优质的显示品味对时序控制器(T-CON)和特定源极驱动芯片(SD)之间的传统接口传输协议速率提出了挑战,因此成为TFT-LCD发展的关键。为了实现数据信号的高速传输,本文研究并提出了一种新型高速点对点接口传输协议CSPI(China Standard Point-to-Point Interface)。CSPI通过嵌入式的CDR(Clock Data Recovery)机制实现T-CON和SD之间时钟校准,CDR校准完成后,指令信号LS输出高电平并反馈发送端T-CON,通知T-CON可以传输下一阶段有效数据,同时,CSPI技术特定封装包对位数据嵌入传输数据线中。数据传输采用特有的8位/9位编码和扰码技术以实现数据快速而不失精准的传输。相对于传统mini-LVDS接口协议,CSPI技术的传输速率可以提升至3Gb/s,有效减少传输线数量,同时大幅提升信号传输质量。此外,CSPI时钟信号内置,可以有效降低EMI。基于1 383mm(55in)超高清液晶显示屏的实验结果表明,眼图的最小幅度和宽度分别约为312mV和548ps。可以满足系统对传输信号稳定性,可靠性和抗干扰能力的要求,同时减少印刷电路板(PCB)布局面积,有利于降低成本。
