An output buffer for amoled column driver circuit
An output buffer, column drive technology, applied in the direction of logic circuit coupling/interface, logic circuit connection/interface arrangement, instrument, etc. using field effect transistors, to achieve the effect of large driving current and small quiescent current
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Embodiment 1
[0050] An output buffer for an AMOLED column drive circuit, comprising: a bias circuit 1, a rail-to-rail input stage circuit 2, a bootstrap stage circuit 3 and an output stage circuit 4, and the rail-to-rail input stage circuit 2 is respectively connected The bootstrap stage circuit 3 and the bias circuit 1 , the bootstrap stage circuit 3 is connected to the output stage circuit 4 . The rail-to-rail input stage circuit 2 is used to amplify the difference between the positive input signal and the reverse input signal; the bootstrap stage circuit 3 is used to increase the control voltage of the output stage circuit 4 to a level higher than The power supply voltage VDD may drop to be lower than the ground voltage VSS; the output stage circuit 4 is used to drive the output load; the bias circuit 1 is used to provide a bias voltage for the rail-to-rail input stage circuit 2 .
[0051] Such as image 3 As shown, in this embodiment, the rail-to-rail input stage circuit 2 includes a ...
Embodiment 2
[0064] According to the first embodiment, the second embodiment is as image 3 As shown, the inverting input terminal V of the rail-to-rail input stage circuit 2 in this embodiment N Connected with the output buffer output signal Vout, the non-inverting input terminal V of the rail-to-rail input stage circuit 2 P with the input signal of the output buffer V IN connected together to form a unity gain buffer structure. Therefore, the signal can be simplified as the input signal V IN (V IN =V P ), the output signal V OUT (V OUT =V N ). According to the input signal V IN and the output signal V OUT , we divide the proposed circuit into the following working states.
[0065] (1) When the input signal V IN equal to the output signal V OUT (Static, V IN =V OUT ), the fifteenth transistor enters the saturation region, the sixteenth transistor enters the linear region, the seventeenth transistor enters the linear region, and the eighteenth transistor enters the saturatio...
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