We developed an organic thin-film transistor (OTFT) -driven 16×16 polymer-dispersed liquid crystal (PDLC) display panel on a flexible plastic film. We fabricated low-voltage-operation bottom-contact (BC) OTFT with Ta
2O
5 gate insulator, using photolithography method. This transistor is suitable for both scaling down and increasing the number of pixels, however its performance is inferior to that of top-contact OTFT because of contamination and defects on the surface of the insulator, and leakage-current of channel region. We have reduced the current of the OTFT by optimizing the pentacene deposition area. We used O
2 plasma, UV cleaning and HMDS as surface treatments suitable for Ta
2O
5 gate insulator, to improve the characteristics. The OTFT showed a good carrier mobility of 0.3 cm
2/Vs, a high current on/off ratio of over 10
6 and a low operating drain voltage of -6V. We also successively confirmed display operation of the fabricated 16×16 PDLC display panel with a low driving voltage of 13 volts.
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