ABSTRACT
In the previous chapter we discussed the influence of the threshold voltage shift in TFTs. We saw that one of the approaches to solve the problem of threshold voltage shift is the use of compensation circuits. The role of the
for Non-Crystalline
compensation circuit was to evaluate the threshold voltage in the TFT of interest. However, compensation circuits are a practial approach when one or very few TFTs have to be compensated for the threshold voltage shift. Typically these TFTs work in analog mode and the accuracy of the effective gate-source voltage is important — for example active matrix light emiting diode display pixel drivers. However, as the circuit gets more complex with more TFTs needing to be controlled, building compensation circuits for each TFT becomes very cumbersome.
