Robust low power DC-type shift register circuit capable of compensating threshold voltage shift of oxide TFTs |
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| Affiliation: | 1. Department of Computer Science and Engineering, National Institute of Technology, Durgapur, India;2. Department of Computer Science and Technology, Bengal Engineering and Science University, Shibpur, India;1. Department of Circuit and System, College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. Division of Communication Systems, Department of Electrical Engineering, Linköping University, SE-581 83, Sweden;3. Division of Integrated Circuits and Systems, Department of Electrical Engineering, Linköping University, SE-581 83, Sweden;1. School of Computer Science and Technology, Northwestern Polytechnical University, Xi''an 710072, Shaanxi, China;2. Institut Pluridisciplinaire Hubert CURIEN, Strasbourg, France |
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| Abstract: | This paper proposes an oxide TFT DC-type shift register that consists of eleven TFTs and one bootstrapping capacitor. The proposed circuit connects drain nodes of large size pull-up TFTs of output drivers to positive supply voltage instead of alternating clock signals for low power consumption. In addition, a robust internal inverter capable of maintaining the high voltage level of the output over the large positive threshold voltage shift by bootstrapping is implemented. For a 120 Hz Full-HD display, the SPICE simulation estimates the clock power consumption of the proposed DC-type circuit as 0.56 mW at 32 shift registers and ensures the robust operation over the wide range of threshold voltage shift from −4 V to 10 V. |
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| Keywords: | Low power Oxide TFT DC-type Shift register Depletion mode Threshold voltage shift |
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