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Triple Pull-Down Gate Driver Using Oxide TFTs  

Kim, Ji-Sun (Department of Electronic Engineering, Konkuk University)
Park, Kee-Chan (Department of Electronic Engineering, Konkuk University)
Oh, Hwan-Sool (Department of Electronic Engineering, Konkuk University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.49, no.1, 2012 , pp. 1-7 More about this Journal
Abstract
We have developed a new gate driver circuit for liquid crystal displays using oxide thin-film transistors (TFTs). In the new gate driver, negative gate bias is applied to turn off the oxide TFTs because the oxide TFT occasionally has negative threshold voltage (VT). In addition, we employed three parallel pull-down TFTs that are turned on in turns to enhance the stability. SPICE simulation showed that the proposed circuit worked successfully covering the VT range of -3 V ~ +6 V And fabrication results confirmed stable operation of the new circuit using oxide TFTs.
Keywords
Gate driver; oxide TFT; negative threshold voltage; depletion-mode; triple pull-down;
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