CUED Publications database

A driving scheme for active-matrix organic light-emitting diode displays based on current feedback

Ashtiani, SJ and Nathan, A (2009) A driving scheme for active-matrix organic light-emitting diode displays based on current feedback. IEEE/OSA Journal of Display Technology, 5. pp. 257-264. ISSN 1551-319X

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Abstract

This paper presents a method of driving active-matrix organic light-emitting diode (AMOLED) displays with amorphous silicon (a-Si) thin-film transistors (TFTs). By using current feedback, the method effectively compensates for the effect of shift in the threshold voltage(V T ) of a-Si TFTs on the OLED current. A CMOS transresistance amplifier is used as the column driver to cancel the effect of large parasitic capacitance of data lines. An accelerating pulse is used at the start of the programming cycle to improve the settling at low currents. A detailed analysis has been done to investigate the effect of circuit components on the sensitivity of the OLED current to V T shift and the settling behavior of the circuit. Prototypes of pixel circuits and the transresistance amplifier were fabricated in an a-Si TFT process and a 0.8- μm 20-V CMOS technology, respectively. Measurements show less than 5% change in the OLED current for 2.5-V shift in $V T of TFTs. Settling times smaller than 50 & mus were achieved for parasitic capacitances of 50200 pF and programming currents as small as 200 nA. © 2006 IEEE.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:08
Last Modified: 23 Nov 2017 03:55
DOI: