Display panel, light emitting display device using the same, and driving method thereof

A display panel of a light emitting display device comprising a plurality of pixel circuits disposed in a matrix format wherein at least one of the pixel circuits comprises:

• a transistor having a first electrode, a second electrode coupled to a first power source, and a third electrode, the transistor for outputting a current corresponding to a voltage applied between the first and second electrodes to the third electrode;
• a light emitting element, coupled between the third electrode of the transistor and a second power source, for emitting light in correspondence to an amount of the current outputted by the transistor;
• a capacitor coupled between the first electrode of the transistor and a third power source;
• and
• a switch for transmitting image signals to the first electrode of the transistor in response to an applied select signal,
• wherein at least one of the first, second, and third power sources provides a variable voltage to allow the light emitting element to emit light at least twice during a data frame period,
• wherein the data frame period is from after an image signal of the image signals are applied to the at least one of the pixel circuits to before a subsequent image signal of the image signals is applied to the at least one of the pixel circuits, and
• wherein at least twice during the data frame period, the third power source provides the voltage of the first power source and a voltage which is less than the voltage of the first power source by a first voltage alternately.

A display panel of a light emitting display device comprising a plurality of pixel circuits disposed in a matrix format wherein at least one of the pixel circuits comprises:

• a transistor having a first electrode, a second electrode coupled to a first power source, and a third electrode, the transistor for outputting a current corresponding to a voltage applied between the first and second electrodes to the third electrode;
• a light emitting element, coupled between the third electrode of the transistor and a second power source, for emitting light in correspondence to an amount of the current outputted by the transistor;
• a capacitor coupled between the first electrode of the transistor and a third power source;
• and
• a switch for transmitting image signals to the first electrode of the transistor in response to an applied select signal,
• wherein at least one of the first, second, and third power sources provides a variable voltage to allow the light emitting element to emit light at least twice during a data frame period,
• wherein the data frame period is from after an image signal of the image signals are applied to the at least one of the pixel circuits to before a subsequent image signal of the image signals is applied to the at least one of the pixel circuits, and
• wherein the third power source provides a voltage which substantially corresponds to the voltage of the first power source while the voltage of the second power source is varied.

A method for driving a light emitting display device comprising a plurality of pixel circuits disposed in a matrix format wherein

• at least one of the pixel circuits comprises:
• a transistor having a first electrode, a second electrode coupled to a first power source, and a third electrode, the transistor for outputting a current corresponding to a voltage applied between the first and second electrodes to the third electrode;
• a capacitor coupled between the first electrode of the transistor and an emit signal line;
• and
• a light emitting element, coupled between the third electrode of the transistor and a second power source, for emitting light in correspondence to an amount of the current outputted by the transistor, wherein
• the method for driving comprises a method for driving the pixel circuits during a data frame period being from after a data signal is applied to the at least one of the pixel circuits to before a subsequent data signal is applied to the at least one of the pixel circuits, the method for driving the pixel circuits comprises
• applying a third voltage to the emit signal line, transmitting the data signal to the first electrode of the transistor, and thus charging the capacitor, and
• applying the third voltage and a fourth voltage to the emit signal line alternately at least twice,
• wherein the third voltage has a voltage level that is substantially the same as that of the voltage of the first power source.

A method for driving a light emitting display device comprising a plurality of pixel circuits disposed in a matrix format wherein

• at least one of the pixel circuits comprises:
• a transistor having a first electrode, a second electrode coupled to a first power source, and a third electrode, the transistor for outputting a current corresponding to a voltage applied between the first and second electrodes to the third electrode;
• a capacitor coupled between the first electrode of the transistor and an emit signal line;
• and
• a light emitting element, coupled between the third electrode of the transistor and a second power source, for emitting light in correspondence to an amount of the current outputted by the transistor, wherein
• the method for driving comprises a method for driving the pixel circuits during a data frame period being from after a data signal is applied to the at least one of the pixel circuits to before a subsequent data signal is applied to the at least one of the pixel circuits, the method for driving the pixel circuits comprises
• applying a third voltage to the emit signal line, transmitting the data signal to the first electrode of the transistor, and thus charging the capacitor, and
• applying the third voltage and a fourth voltage to the emit signal line alternately at least twice,
• wherein the transistor comprises a P channel transistor, the first electrode is a gate, the second electrode is a source, and the third electrode is a drain, and
• wherein the fourth voltage is established to have a level which is greater than that of the third voltage so as to electrically interrupt the transistor while the second voltage is applied to the emit signal line.