Threshold Voltage Compensation Error in Voltage Programmed AMOLED Displays
Accepted version
Peer-reviewed
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Abstract
© 2005-2012 IEEE. A new accurate voltage-programmed pixel circuit for active-matrix organic light-emitting diode (AMOLED) displays is presented. Composed of three TFTs and one storage capacitor, the proposed pixel circuit is implemented both in a-Si and a-IGZO TFT technologies for the same pixel size for fair comparison. The simulation result for the a-Si-based design shows that, during a programming time of {\hbox{90}}μ \hbox{s} , the pixel circuit was able to compensate for a 3 V threshold voltage (V\rm th) shift of the drive TFT with almost no error. In contrast, the a-IGZO-based pixel circuit, has a larger current error (of around 8%), despite its proven three-fold higher speed.
Description
Keywords
Active-matrix organic light-emitting diode (AMOLED), amorphous silicon (a-Si), compensation, oxide thin-film transistor (TFT)
Journal Title
Journal of Display Technology
Conference Name
Journal ISSN
1551-319X
1558-9323
1558-9323
Volume Title
12
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
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Sponsorship
Engineering and Physical Sciences Research Council (EP/M013650/1)
Authors thank to the EPSRC under Project EP/M013650/1.