丝网印刷碳纳米管显示器驱动电路的研制

为解决采用丝网印刷技术制作的碳纳米管显示器件(CNT-FED)驱动电压高、亮度均匀性差的问题,设计并实现了电压控制的寻址与显示分离型的驱动电路.采用分离高压控制器件实现了行、列驱动电压波形,并利用反向高压控制暗像素点,不仅能满足丝网印刷CNT-FED 700~1 000 V的高压驱动要求,并且有效抑制了漏电流导致的串亮现象.在各行电路上设计了限流电阻,对场发射电流起到反馈作用,有效改善了亮度均匀性.该驱动电路成本低,且从电路角度提升了丝网印刷CNT-FED的亮度和发光均匀性.测试结果表明:由新电路驱动的CNT-FED可实现动画显示,峰值亮度可达到1 400 cd/m2.

Study on Driving Circuit for Complete Silk Screen-Printed Carbon Nano-Tube Field Emission Display

To avoid the high driving voltage and illuminant non-uniformity of carbon nano-tube field emission display(CNT-FED) fabricated by silk screen-printed technology,a voltage controlled address display-period separation driving circuit is designed and implemented.Line and column driving wave are realized by adopting a separate high voltage controller and a reverse high voltage is applied to control turn-off pixels.The circuit not only satisfies the high driving voltage from 700 V to 1 000 V for silk screen-printed CNT-FED,and also the crosstalk caused by leakage current is restrained.Current-limit resistance is presented on every line which serves as the feedback for field emission current,and the illuminant uniformity of CNT-FED is improved effectively.The driving circuit has low cost,and luminance and uniformity of silk screen-printed CNT-FED is advanced from the point of circuits view.Tests results show that CNT-FED with the driving circuit can displays dynamic image and the peak luminance comes to 1 400 cd/m2.