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The shift register of display panel employing double-gate oxide thin-film transistors (TFTs) to compensate the severe degradation of the threshold voltage (V TH) is proposed. In double-gate TFTs, V TH… Click to show full abstract
The shift register of display panel employing double-gate oxide thin-film transistors (TFTs) to compensate the severe degradation of the threshold voltage (V TH) is proposed. In double-gate TFTs, V TH is controlled by adjusting top-gate bias, so that V TH degradation can be stabilised by top-gate bias control. However, an optimum top-gate voltage varies from product to product due to process–voltage–temperature variation. To overcome this variation, a feedback system is designed and fabricated in a 0.18 μm BCDMOS process. The system consists of the shift register current sensing and the searching algorithm for finding optimal top-gate bias of double-gate TFTs. It is verified that proposed system successfully stabilised the operation of the shift register up to 80°C.
Journal Title: Electronics Letters
Year Published: 2017
Link to full text (if available)
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