SIGNAL LINE DRIVER CIRCUIT AND ACTIVE MATRIX SUBSTRATE, AND DISPLAY DEVICE

PROBLEM TO BE SOLVED: To suppress fluctuation of a threshold value voltage of an n channel TFT and superposition of an electromagnetic noise on an n channel TFT and its wiring, and to simplify and miniaturize a circuit structure.SOLUTION: A signal line driver circuit alternately inputs: a first n-ch...

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Bibliographic Details
Main Author ICHIMURA TERUHIKO
Format Patent
LanguageEnglish
Japanese
Published 05.07.2018
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Summary:PROBLEM TO BE SOLVED: To suppress fluctuation of a threshold value voltage of an n channel TFT and superposition of an electromagnetic noise on an n channel TFT and its wiring, and to simplify and miniaturize a circuit structure.SOLUTION: A signal line driver circuit alternately inputs: a first n-channel TFT1 for outputting an initiating pulse (in) to a second n-channel TFT2; the second n-channel TFT2 for outputting a clock pulse (VCK1) having a peak potential of a positive potential as a drive pulse to a signal line 12; a third n-channel TFT3 (TFT3) for resetting the potential of the first connection line 21 after the drive pulse is outputted to a negative potential; a high signal pulse having the peak potential of the positive potential on a gate electrode of the third n-channel TFT3; and a low signal pulse having a bottom potential of a negative potential. The signal line driver circuit further includes a rising portion of the high signal pulse and/or a control circuit 11 for inclining a falling portion.SELECTED DRAWING: Figure 1 【課題】 nチャネルTFTの閾値電圧の変動を抑えること、またnチャネルTFTおよびその配線に電磁ノイズが重畳されることを抑えること、また回路構成を簡易化および小型化すること。【解決手段】 信号線駆動回路は、開始パルス(in)を第2のnチャネルTFT2に出力する第1のnチャネルTFT1と、開始パルスによってオンされ、正電位のピーク電位を有するクロックパルス(VCK1)を駆動パルスとして信号線12に出力する第2のnチャネルTFT2と、駆動パルスの出力後に第1の接続線21の電位を負電位にリセットする第3のnチャネルTFT3(TFT3)と、第3のnチャネルTFT3のゲート電極に、正電位のピーク電位を有するハイ信号パルスと、負電位のボトム電位を有するロー信号パルスと、を交互に入力するとともに、ハイ信号パルスの立上がり部および/または立下がり部を傾斜させる制御回路11と、を有している。【選択図】 図1
Bibliography:Application Number: JP20160255602