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The TFTs act as switching devices to actively maintain the pixel state while addressing other pixels. The two common TFT backplane technologies used are the non-crystalline thin-film silicon and the polycrystalline silicon. These technologies aid in the fabricating of active matrix backplanes for flexible plastic substrates. Flexible plastic substrates are crucial in producing flexible AMOLED displays.
The AMOLED technology provides a higher refresh rate than its passive-matrix counterpart and consumes less power. This advantage gives it an edge to be the technology of choice in the manufacture of mobile devices. Other advantages are:
One major disadvantage with the AMOLED is the limited lifetime of the organic compound used. The blue OLEDs reduce to half their brightness after 14,000 hours. This is compared to conventional LCDs, which usually dim to half after 25,000 to 40,000 hours.