An organic light-emitting display comprising: a display panel comprising pixels and sensing lines connected to said pixels; a current integrator (Ci, 12a) a sampling part and an analog-to-digital converter, wherein the current integrator (Ci,12a) comprises: an amplifier that comprises a first external input terminal connected to a sensing line and adapted to receive current from the pixels through said sensing line, a second external input terminal configured to receive a reference voltage (Vref), a first internal input terminal, a second internal input terminal, and an output terminal for outputting an output voltage; an integrating capacitor (Cfb) connected between the first external input terminal and output terminal of the amplifier; and a reset switch connected to both ends of the integrating capacitor (Cfb), wherein the amplifier comprises a swapping part (OS, 12a2) adapted to connect the first external input terminal to the first internal input terminal and to connect the second external input terminal to the second internal input terminal in a first configuration of the swapping part (OS, 12a2) and to connect the first external input terminal to the second internal input terminal and to connect the second external input terminal to the first internal input terminal in a second configuration of the swapping part (OS, 12a2); wherein the sampling part is connected to the output terminal of the amplifier and comprises a first sample & hold circuit arranged to sample, when the swapping part has the first configuration, a first output voltage of the current integrator and a second sample & hold circuit arranged to sample, when the swapping part has the second configuration, a second output voltage of the current integrator, subsequent to the first output voltage, wherein the sampling part is adapted to output the voltages sampled by the first and second sample & hold circuits (SH1, SH2) simultaneously as average output voltage through the single output channel of the sampling part; and wherein the analog-to-digital converter is connected to the single output channel of the sampling part and is adapted to convert the voltages received from the single output channel to digital sensed values and to output the digital sensed values. a display panel comprising pixels and sensing lines connected to said pixels; a current integrator (Ci, 12a) a sampling part and an analog-to-digital converter, wherein the current integrator (Ci,12a) comprises: an amplifier that comprises a first external input terminal connected to a sensing line and adapted to receive current from the pixels through said sensing line, a second external input terminal configured to receive a reference voltage (Vref), a first internal input terminal, a second internal input terminal, and an output terminal for outputting an output voltage; an integrating capacitor (Cfb) connected between the first external input terminal and output terminal of the amplifier; and a reset switch connected to both ends of the integrating capacitor (Cfb), an amplifier that comprises a first external input terminal connected to a sensing line and adapted to receive current from the pixels through said sensing line, a second external input terminal configured to receive a reference voltage (Vref), a first internal input terminal, a second internal input terminal, and an output terminal for outputting an output voltage; an integrating capacitor (Cfb) connected between the first external input terminal and output terminal of the amplifier; and a reset switch connected to both ends of the integrating capacitor (Cfb), wherein the amplifier comprises a swapping part (OS, 12a2) adapted to connect the first external input terminal to the first internal input terminal and to connect the second external input terminal to the second internal input terminal in a first configuration of the swapping part (OS, 12a2) and to connect the first external input terminal to the second internal input terminal and to connect the second external input terminal to the first internal input terminal in a second configuration of the swapping part (OS, 12a2); wherein the sampling part is connected to the output terminal of the amplifier and comprises a first sample & hold circuit arranged to sample, when the swapping part has the first configuration, a first output voltage of the current integrator and a second sample & hold circuit arranged to sample, when the swapping part has the second configuration, a second output voltage of the current integrator, subsequent to the first output voltage, wherein the sampling part is adapted to output the voltages sampled by the first and second sample & hold circuits (SH1, SH2) simultaneously as average output voltage through the single output channel of the sampling part; and wherein the analog-to-digital converter is connected to the single output channel of the sampling part and is adapted to convert the voltages received from the single output channel to digital sensed values and to output the digital sensed values.