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Dezember 2012
Fabio Pieralisi
Low Temperature Polycrystalline Silicon Integrated Analogue and Digital Display Drivers
The active-matrix OLED (AMOLED) technology has emerged as the most promising candidate for the next generation of large area high resolution flat panel displays. And, to date, excimer laser annealed low temperature polysilicon (LTPS) is the primary thin film transistor (TFT) technology for the realization of AMOLED display backplanes. Still, for LTPS TFT AMOLED displays to establish themselves against the ubiquitous liquid crystal displays, superior image quality and affordable costs must be achieved. The picture requirements demanded by high-quality display applications can be achieved by overcoming the spatial non uniformities of LTPS TFT electrical characteristics, which affect the uniformity of OLED driving currents on the backplane. Fabrication costs can be greatly reduced through the monolithic integration of row and column drivers on the backplane, allowing to spare the peripheral chips and leading to higher production yields. Further manufacturing cost reductions can be achieved by employing single channel (either NMOS or PMOS) LTPS TFT processes, which require a reduced number of fabrication process steps compared to the complementary (CMOS) approach.
In the present work advanced single-channel LTPS TFT devices and electronic circuits for the realization of high-performance AMOLED backplanes and integrated digital and analogue peripheral drivers are investigated. Reliable parameter extraction processes, accurate device simulation models and layout guidelines for reducing transistor non idealities and non uniformities are determined. A novel three TFTs (3T) pixel circuit, enabling the external compensation driving method for high resolution displays, is successfully implemented in a 4.4 inch qVGA PMOS LTPS TFT AMOLED display demonstrator, upon the design of a reliable cell layout and the determination of the optimum driving conditions. A novel two phase ratioed dynamic NMOS LTPS TFT shift register with a dual bootstrap output stage, conceived for addressing the two independent switching TFTs in the 3T pixel circuit, is integrated in a 4.4 inch qVGA NMOS LTPS TFT AMOLED display demonstrator. Reliable row driver operation has been achieved through the implementation of wide channel sliced TFT structures, which greatly reduce the self heating degradation effects. The electrical behaviour of a novel NMOS single channel output offset compensated operational amplifier (op amp) is simulated. For the accurate implementation of basic analogue building blocks, integrated ITO thin film resistors (TFRs) and long channel sliced TFT pairs are developed.
In the present work advanced single-channel LTPS TFT devices and electronic circuits for the realization of high-performance AMOLED backplanes and integrated digital and analogue peripheral drivers are investigated. Reliable parameter extraction processes, accurate device simulation models and layout guidelines for reducing transistor non idealities and non uniformities are determined. A novel three TFTs (3T) pixel circuit, enabling the external compensation driving method for high resolution displays, is successfully implemented in a 4.4 inch qVGA PMOS LTPS TFT AMOLED display demonstrator, upon the design of a reliable cell layout and the determination of the optimum driving conditions. A novel two phase ratioed dynamic NMOS LTPS TFT shift register with a dual bootstrap output stage, conceived for addressing the two independent switching TFTs in the 3T pixel circuit, is integrated in a 4.4 inch qVGA NMOS LTPS TFT AMOLED display demonstrator. Reliable row driver operation has been achieved through the implementation of wide channel sliced TFT structures, which greatly reduce the self heating degradation effects. The electrical behaviour of a novel NMOS single channel output offset compensated operational amplifier (op amp) is simulated. For the accurate implementation of basic analogue building blocks, integrated ITO thin film resistors (TFRs) and long channel sliced TFT pairs are developed.
Schlagwörter: Low Temperature Polycrystalline Silicon; AMOLED Display; Integrated Drivers
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