DTFTS

AcronymDefinition
DTFTSDoubly-Truncated Failure-Time Series
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The proposed circuit was composed of five TFTs and one capacitor and it simultaneously compensated for the threshold voltage variations of DTFTs and OLEDs and the I x R drop voltage of a power line.
The voltage previously stored in [C.sub.ST] is reset; therefore, the gate voltage of the DTFT connected to [C.sub.ST] is also reset for initialization.
In this stage, the threshold voltage of the DTFT ([V.sub.TH]) is detected by the compensation operation.
Capacitor [C.sub.ST] maintains the gate voltage of DTFT ([V.sub.DATA] + [V.sub.TH]) until the reset stage of next operation cycle.
Thus, [I.sub.OLED] is independent of the DTFT and OLED threshold voltages and is only affected by the data voltage ([V.sub.DATA]).
Figure 5 shows the transient waveforms of each DTFT node when the data voltage ([V.sub.DATA]) is 3 V.