提高亮度均勻性之Full HD主動式矩陣有機發光二極體畫素補償電路設計

Abstract

Active-matrix organic light-emitting diode displays have many advantages, such as wide-viewing angle, fast response time and excellent color reproducibility. This thesis presents five compensation pixel circuits for use in AMOLED displays to solve the issues including deviations of electrical characteristics of thin-film transistors, such as low-temperature polycrystalline-silicon, amorphous indium-gallium-zinc-oxide technology, and OLED degradation as well as power line I-R drop. The first circuit is utilized of simple 2T1C structure for use in 3D Full HD displays, and it compensates for threshold voltage variation. Howerver, the external swith circuit increases the system costs. Although the second circuit compensates for threshold voltage variation without external swith circuit, it suffers from VDD I-R drop. The third circuit compensates for not only threshold voltage variation but also VDD I-R drop and mobility variation. The previous three circuits are voltage programming LTPS pixel circuits, and the following two a-IGZO pixel circuits are operated with current-biased voltage-programming method. Although the fourth circuit compensates for threshold voltage shift of the driving TFT and the OLED with simple operation, the structure 5T1C is more complex. The last circuit with simple 3T1C structure can also compensate for threshold voltage shift of the driving TFT and the OLED, but the uniformity of luminance would be affected by parasitic resistance and capacitance of SCAN line signals.

Date of Award	2014
Original language	Chinese (Traditional)
Supervisor	Chih-Lung Lin (Supervisor)