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Improvement of brightness uniformity by AC driving scheme for AMOLED display

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2 Author(s)
Yen-Chung Lin ; Opt. Storage & Display Lab., Nat. Chiao-Tung Univ., Hsinu, Taiwan ; Shieh, Han-Ping D.

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.

Published in:

Electron Device Letters, IEEE  (Volume:25 ,  Issue: 11 )