Organic light emitting diode display

A pixel comprising:

• a light emitting device;
• a driving transistor for causing a driving current to flow through the light emitting device;
• a first switching unit for selectively delivering a data signal;
• a second switching unit for selectively delivering a first power of a first power source;
• and
• a storage unit for applying a voltage to a gate electrode of the driving transistor, wherein, when the first power is not delivered to the storage unit, the storage unit applies a second power of a second power source to the gate electrode of the driving transistor to store a first voltage, wherein the storage unit then stores a second voltage corresponding to the data signal and applies the first voltage and the second voltage to the gate electrode of the driving transistor, and wherein the first voltage comprises a voltage difference between a source electrode of the driving transistor and the gate electrode of the driving transistor.

A pixel comprising:

• a light emitting device;
• a driving transistor for causing a current to flow through the light emitting device;
• a second switching transistor for selectively delivering a first power of a first power source to a gate electrode of the driving transistor in response to a first scan signal;
• a third switching transistor for selectively delivering a voltage at a source electrode of the driving transistor in response to the first scan signal when the first power is applied to the gate electrode of the driving transistor;
• a fourth switching transistor for selectively delivering a second power of a second power source to the driving transistor in response to a second scan signal;
• a first switching transistor for selectively delivering a data signal in response to a third scan signal;
• a first capacitor for storing a voltage having a voltage difference between the delivered data signal and the second power;
• and
• a second capacitor for storing a voltage having a threshold voltage of the driving transistor, wherein the driving transistor causes the current to flow through the light emitting device in response to the voltage stored into the first capacitor and the voltage stored into the second capacitor.

An organic light emitting diode display comprising:

• a plurality of scan lines comprising a first scan line, a second scan line, and a third scan line;
• a data line for delivering data signals;
• and
• a plurality of pixels connected to the scan lines and the data line, wherein at least one of the pixels comprises:
• a light emitting device;
• a driving transistor for causing a current to flow through the light emitting device;
• second switching transistor for selectively delivering a first power of a first power source to a gate electrode of the driving transistor in response to a first scan signal;
• a third switching transistor for selectively delivering a voltage at a source electrode of the driving transistor in response to the first scan signal when the first power is applied to the gate electrode of the driving transistor;
• a fourth switching transistor for selectively delivering a second power of a second power source to the driving transistor in response to a second scan signal;
• a first switching transistor for selectively delivering at least one of the data signals in response to a third scan signal;
• a first capacitor for storing a voltage having a voltage difference between the delivered data signal and the second power;
• and
• a second capacitor for storing a voltage having a threshold voltage of the driving transistor, wherein the driving transistor causes the current to flow through the light emitting device in response to the voltage stored into the first capacitor and the voltage stored into the second capacitor.