On-panel Analog Output Buffer for Data Driver with Consideration of Device Characteristic Variation in LTPS Technology
A class-A analog output buffer for the data driver with consideration of device variation in low temperature poly-silicon (LTPS) technology is proposed. With high enough mobility, LTPS thin-film transistor (TFT) has been suitable for the realization with driver circuits on the LCD panel to meet system-on-panel (SoP) applications. However, the device characteristics of poly-Si TFTs have poor uniformity and suffer from huge variations in different locations due to the poly-silicon grain structures. Besides, the variation on device characteristic of the N-type TFT is much worse than that of P-type TFT. Therefore, replacing the critical part of the analog circuit by P-TFTs is a good design solution for suppressing device characteristic variation in order to improve manufacturing yield of the analog circuit on panel. A class-A output buffer realized with P-TFTs as the input stage has been designed and fabricated in a 8-μm LTPS technology. From the experimental results, this proposed analog output buffer with P-TFTs as input stage can be operated at 50-kHz operation frequency with at least a 1 -to-9 V output swing for using in the on-panel data drivers to provide a uniform brightness and high resolution display.
Data Driver Analog Output Buffer LTPS Slew Rate Manufacturing Yield
Yu-Hsuan Li Ming-Dou Ker Chun-Yao Huang Chun-Yuan Hsu
Nanoelectronics and Gigascale Systems Laboratory,Institute of Electronics, National Chiao-Tung Unive Panel Design Dept., Technology Development General Division,R&D Center, TFT Business Unit, Chunghwa
国际会议
上海
英文
210-215
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）