TFT Pixel Design Considerations

The previous sections have described how an a-Si H and polymeric-based TFTs can be fabricated using the digital lithographic process. While a layer-to-layer registra- 

For example, active-matrix backplanes for reflective displays using electrophoretic media is a potential application for large-area electronics. Electrophoretic media are usually charged colored particles suspended in an insulating fluid [35-37]. When the fluid is held in an electric field between two conductive plates, the particles will move between the plates creating a dark or a reflective state. Because the contrast in an electrophoretic display is because of reflection, no backlight is required and the display has relatively low-power consumption compared with a transmissive liquid-crystal display. 

The design of active-matrix TFT (AM-TFT) backplanes for capacitive media, such as electrophoretic ink, has been extensively reviewed [1] and we discuss here some of the most relevant issues for printed backplanes. A simplified equivalent circuit for a pixel in an AM-TFT backplane is shown in Fig. 11.14. 

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