Title :
A source-follower type analog buffer using poly-Si TFTs with large design windows
Author :
Tai, Ya-Hsiang ; Pai, Cheng-Chiu ; Chen, Bo-Ting ; Cheng, Huang-Chung
Author_Institution :
Dept. of Photonics, Nat. Chiao-Tung Univ., Hsinchu, Taiwan
Abstract :
New simple source follower circuits using low-temperature polycrystalline silicon thin-film transistors (LTPS-TFTs) as analog buffers for the integrated data driver circuit of active-matrix liquid crystal displays and active-matrix light emitting diodes are discussed. In addition to the threshold voltage difference of driving TFTs, the unsaturated of output voltage arisen from the significant subthreshold current will also result in the difficulty of the buffer circuit design. The proposed circuit is capable of minimizing the variation from both the signal timing and the device characteristics.
Keywords :
LED displays; analogue integrated circuits; buffer circuits; driver circuits; integrated circuit design; liquid crystal displays; thin film transistors; AMLCD; AMOLED; LTPS-TFT; active-matrix light emitting diodes; active-matrix liquid crystal displays; analog buffer; buffer circuit design; integrated data driver circuit; low-temperature polycrystalline silicon thin-film transistor; poly-Si TFT; source follower circuits; threshold voltage; Active matrix liquid crystal displays; Active matrix technology; Circuit synthesis; Driver circuits; Light emitting diodes; Silicon; Subthreshold current; Thin film transistors; Threshold voltage; Timing; Active-matrix light emitting diodes (AMOLEDs); active-matrix liquid crystal displays (AMLCDs); low-temperature polycrystalline silicon thin-film transistors (LTPS-TFTs); source follower;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2005.857689