Suppressing ${V_{\mathrm{TH}}}$ Variations in LTPS Thin-Film Transistors With Current Scaling Ratio Modulation for AMOLED Display
| Autor: | Po-Ting Lee, Chih-Cheng Hsu, Po-Chun Lai, Pin-Yen Kuo, Po-Syun Chen, Chih-Lung Lin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science business.industry Transistor 02 engineering and technology Current source 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials Threshold voltage law.invention AMOLED Thin-film transistor law 0103 physical sciences Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Voltage drop Voltage Diode |
| Zdroj: | IEEE Transactions on Electron Devices. 65:3577-3581 |
| ISSN: | 1557-9646 0018-9383 |
| DOI: | 10.1109/ted.2018.2848700 |
| Popis: | This brief suppresses threshold voltage ( ${V}_{\text {TH}}$ ) variations in low-temperature polycrystalline-silicon thin-film transistors (LTPS TFTs) with a new current scaling ratio modulation method for the application of active-matrix organic light-emitting diode displays. With a newly proposed 3T2C LTPS TFT-based pixel circuit, high-current scaling ratios at low gray levels and low ratios at high gray levels are achieved. Thus, the programming time at low gray levels can be reduced, and the driving currents of the OLED are efficiently generated over the entire data range without consuming extra power for the current source. The driving currents are also independent of the threshold voltage of the driving TFT and the power line voltage, guaranteeing the uniformity of the current. Simulation results demonstrate that the relative current error rates are below 3.7% as the threshold voltage varies ±0.5 V and below 5.3% as the threshold voltage varies ±0.5 V and the power line voltage drops by 1 V; the programming time can be as short as only $12~\mu \text{s}$ . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|