Title :
Improvement of brightness uniformity by AC driving scheme for AMOLED display
Author :
Lin, Yen-Chung ; Shieh, Han-Ping D.
Author_Institution :
Opt. Storage & Display Lab., Nat. Chiao-Tung Univ., Hsinu, Taiwan
Abstract :
We propose an AC voltage driving scheme which can improve the brightness uniformity of active-matrix organic light-emitting diode (AMOLED) displays. Through the use of a charge feed-through mechanism and an AC driving voltage, the voltage drop caused by the parasitic resistance can be compensated. A 2.2 in AMOLED panel with a resolution of 176×RGB×220 has been fabricated by low temperature polycrystalline silicon technology to evaluate the performance of the AC driving scheme. Experimental results show that a brightness uniformity of higher than 91.6%, achieved by the AC driving scheme, in contrast to that of 74% achieved by a DC driving scheme.
Keywords :
LED displays; driver circuits; organic light emitting diodes; thin film transistors; AC voltage driving; AMOLED display; active-matrix organic light-emitting diode; brightness uniformity; charge feed-through mechanism; low temperature polycrystalline silicon; parasitic resistance; thin-film transistor; voltage drop; Active matrix organic light emitting diodes; Active matrix technology; Brightness; Circuits; Electrodes; Flat panel displays; Liquid crystal displays; Organic light emitting diodes; Thin film transistors; Voltage; AC driving; AM; AMOLED; LED; TFT; active-matrix; light-emitting diode; thin-film transistor; uniformity;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2004.837535
