Organic light emitting device pixel circuit and driving method therefor

A pixel circuit in an organic light emitting device, comprising:

• a first transistor for delivering a data signal voltage in response to a current scan line signal;
• a second transistor for programming the data signal voltage and for generating a driving current in response to a programmed data signal when light is emitted;
• a third transistor for providing the data signal voltage for the second transistor in response to the current scan signal;
• a capacitor for maintaining the data signal voltage programmed onto the second transistor;
• a fourth transistor for delivering a power supply voltage to the second transistor when the light is emitted;
• a fifth transistor for delivering the driving current, provided from the second transistor, in response to the data signal voltage when the light is emitted;
• and
• an electroluminescent element for emitting light corresponding to the driving current delivered through the fifth transistor,
• wherein the third transistor connects the second transistor in the form of a diode in response to the current scan signal so that the second transistor detects and compensates its threshold voltage deviation in itself.

A pixel circuit in an organic light emitting device, comprising:

• an electroluminescent element for emitting light in response to an applied driving current;
• a first transistor for delivering a data signal voltage in response to a current scan line signal;
• a second transistor for generating a driving current to drive the electroluminescent element in response to the data signal voltage;
• a third transistor for connecting the second transistor in the form of a diode in response to the current scan signal to self-compensate a threshold voltage of the second transistor;
• a capacitor for storing the data signal voltage delivered to the second transistor;
• a fourth transistor for delivering a power supply voltage to the second transistor in response to a current light-emitting signal;
• and
• a fifth transistor for providing the driving current, provided from the second transistor, for the electroluminescent element in response to the current light-emitting signal.

A pixel circuit in an organic light emitting device, comprising:

• a first transistor including a gate to which a current scan signal is applied, and a source to which a data signal voltage is applied;
• a second transistor whose source is coupled to a drain of the first transistor;
• a third transistor whose drain and source are connected between a gate and a drain of the second transistor;
• a fourth transistor including a gate to which a current light-emitting signal is applied, a source to which a power supply voltage is applied, and a drain coupled to the source of the second transistor;
• a fifth transistor including a gate to which the current light-emitting signal is applied, a source coupled to the drain of the second transistor, and a drain coupled to one terminal of an electroluminescent element;
• the electroluminescent element having the one terminal coupled to the drain of the fifth transistor and the other terminal grounded;
• and
• a capacitor in which one terminal of the capacitor is coupled to the gate of the second transistor and a power supply voltage is applied to the other terminal of the capacitor.

A pixel circuit in an organic light emitting device having a plurality of data lines, a plurality of scan lines, a plurality of power lines, and a plurality of pixels each connected to one associated data line, scan line and power line of the plurality of data lines, scan lines and power lines, each pixel comprising:

• a first transistor including a gate to which a current scan signal to be applied to the associated scan line is applied, and a source to which a data signal voltage from the data line is applied;
• a second transistor whose source is coupled to a drain of the first transistor;
• a third transistor whose drain and source are connected between a gate and a drain of the second transistor, respectively;
• a fourth emitting transistor including a gate to which a current light-emitting signal is applied, a source to which a power supply voltage from the power line is applied, and a drain coupled to the source of the second transistor;
• a fifth transistor including a gate to which the current light-emitting signal is applied, and a source coupled to the drain of the second transistor;
• an electroluminescent element including one terminal coupled to the drain of the fifth transistor and the other terminal grounded;
• and
• a capacitor including one terminal coupled to the gate of the second transistor, and the other terminal to which the power supply voltage from the power line is applied.