Error compensator and organic light emitting display device using the same

摘要

An error compensator and an organic light emitting display device using the same. The organic light emitting display device includes pixels each having a driving transistor and an organic light emitting diode; and a sensing unit extracting at least one of a first information including the threshold voltage of the driving transistor or a second information including the degradation of the organic light emitting diode from a pixel of the pixels. In the organic light emitting display device, the sensing unit includes an amplifier amplifying a voltage corresponding to the at least one of the first information or the second information; and an error compensator compensating for error components of elements included in the amplifier and the error compensator.

主权项

1. An organic light emitting display device, comprising:
a plurality of pixels each having a driving transistor and an organic light emitting diode; and a sensing unit for extracting at least one of a first information including a threshold voltage of the driving transistor or a second information including a degradation of the organic light emitting diode from a pixel of the pixels, wherein the sensing unit includes:
an amplifier for amplifying a voltage corresponding to the at least one of the first information or the second information;an error compensator for compensating for error components of elements included in the amplifier and the error compensator; andan analog-digital converter for converting an output of the error compensator, wherein the error compensator is coupled between the amplifier and the analog-digital converter, the error compensator comprising:
a first operational amplifier (OP-AMP) and a second OP-AMP;a first switch and a first capacitor, coupled in parallel between a first input terminal and an output terminal of the first OP-AMP;a second switch coupled between a first input terminal and an output terminal of the second OP-AMP;a first storage unit coupled between the output terminal of the first OP-AMP and the first input terminal of the second OP-AMP, and for changing a voltage at the output terminal of the first OP-AMP and supplying the changed voltage to the first input terminal of the second OP-AMP; anda second storage unit coupled between the first input terminal and the output terminal of the second OP-AMP, and wherein the second storage unit comprises:
a second capacitor coupled between tenth and eleventh nodes;a ninth switch coupled between the eleventh node and the first input terminal of the second OP-AMP;a tenth switch coupled between the tenth node and the output terminal of the second OP-AMP;an eleventh switch coupled between the tenth node and the first input terminal of the second OP-AMP; anda twelfth switch coupled between the eleventh node and the output terminal of the second OP-AMP.