Fig. 1. Electronic paper display driven by OTFT on PI substrate.(a) Cross-section of one pixel；(b) Electrophoretic display bent to a curvature radius of about 1 cm^［12］.

Fig. 2. TFT performance. (a) Output characteristics of TFT on PET (L=10 µm，W=240 µm）； (b) Uniformity of 100 TFT ON and OFF currents across a 60 × 80 active-matrix array^［14］.

Fig. 3. (a) Photograph of flexible display in operation while being bent to a radius of curvature of 5 mm； (b) TFT performance before and after flexing to a radius of curvature of 5 mm^［14］.

Fig. 4. (a) Transfer characteristics of polymer TFT； (b) Change of the on-current and off-current as function of exposure time to air^［15］.

Fig. 5. (a) On current，off current，and on/off ratio characteristics measured from 250 polymer OTFTs； (b) Threshold voltage and mobility variation measured from 250 polymer OTFTs^［18］.

Fig. 6. Simulated transfer characteristics of the OTFTs in BCBG structure (a) and BCTG structure (b）^［19］

Fig. 7. Simulated gate drain parasitic capacitance (C_gd)as a function of V_gd．(a) BCBG structure； (b) BCTG structure^［19］．

Fig. 8. Transfer curves of U-type dual TFT(a) and dual-gate TFT (b) on a metal foil^［23］

Fig. 9. Initial (Gray curves）‍，heat treatment (Blue curves）‍，and bias-temperature stress (Red curves)characteristics of a-Si∶H TFTs fabricated on stainless steel substrate at 250 ℃^［24］.

Fig. 10. (a）Transfer characteristics of an a-Si TFT on a plastic film before and after an environmental test at 85 ℃ and relative humidity of 85%； (b）Transfer characteristics of pixel TFT measured before and after 100 000 times bending test with r=5 mm^［25］.

Fig. 11. (a) Structure of conventional color electronic paper；(b) Novel “front drive” structure^［28］.

Fig. 12. Transmission spectra of each subpixel with and without transparent TFT^［28］

Fig. 13. Transfer characteristics of a-IGZO TFT ^［29］

Fig. 14. Transfer characteristics of ZnO TFT in the AM-EPD^［30］

Fig. 15. (a) Transfer characteristic curves，measured 10 times without gate bias stress； (b) Output characteristic curves^［33］.