Light emitting display device

A light emitting display device, comprising:

• a plurality of first pixels in a first display area of a display panel, each of the plurality of first pixels comprising a first driving switching element connected to a first power line and a first light emitting element connected to a second power line;
• a first maximum voltage detection unit for detecting a voltage from each of the first light emitting elements of each of the first pixels and outputting a first maximum voltage that has a highest voltage level among the detected voltages;
• a first power supply unit for correcting a first driving voltage based on the first maximum voltage and applying the corrected first driving voltage to the first power line;
• a plurality of second pixels in a second display area of the display panel, each of the plurality of second pixels comprising a second driving switching element connected to a third power line and a second light emitting element connected to the second power line;
• a second maximum voltage detection unit for detecting a voltage from each of the second light emitting elements of each of the second pixels and outputting a second maximum voltage that has a highest voltage level among the detected voltages;
• and
• a second power supply unit for correcting a third driving voltage based on the second maximum voltage and applying the corrected third driving voltage to the third power line,
• wherein the first maximum voltage detection unit comprises:
• a first resistor connected between a first feedback input terminal of the first power supply unit and the second power line, the first maximum voltage being input to the first feedback input terminal;
• and
• a first diode-type element connected between each one of the first light emitting elements of the first pixels and the first resistor, and a first terminal of each of the first diode-type elements is individually connected to a corresponding one of the first light emitting elements of the first pixels, and
• a second terminal of each of the first diode-type elements is connected in common to the first feedback input terminal.

A light emitting display device, comprising:

• a display panel;
• a plurality of first pixels disposed in the display panel, each of the plurality of first pixels comprising a first driving switching element connected to a first power line and a first light emitting element connected to a second power line;
• a first maximum voltage detection unit for detecting a voltage from each of the first light emitting elements of each of the first pixels and outputting a first maximum voltage that has a highest voltage level among the detected voltages;
• a first power supply unit for correcting a first driving voltage based on the first maximum voltage and applying the corrected first driving voltage to the first power line;
• a plurality of second pixels disposed in the display panel, each of the plurality of second pixels comprising a second driving switching element connected to a third power line and a second light emitting element connected to the second power line;
• a second maximum voltage detection unit for detecting a voltage from each of the second light emitting elements of each of the second pixels and outputting a second maximum voltage that has a highest voltage level among the detected voltages;
• and
• a second power supply unit for correcting a third driving voltage based on the second maximum voltage and applying the corrected third driving voltage to the third power line,
• wherein the first light emitting element emits a light having a color different from a color of a light emitted from the second light emitting element,
• wherein the first maximum voltage detection unit comprises:
• a first resistor connected between a first feedback input terminal of the first power supply unit and the second power line, the first maximum voltage being input to the first feedback input terminal;
• and
• a first diode-type element connected between each one of the first light emitting elements of the first pixels and the first resistor, and
• a first terminal of each of the first diode-type elements is individually connected to a corresponding one of the first light emitting elements of the first pixels, and a second terminal of each of the first diode-type elements is connected in common to the first feedback input terminal.

A light emitting display device, comprising:

• a display panel including a plurality of pixels, each of the plurality of pixels comprising a driving switching element connected to a first power line and a light emitting element connected to a second power line;
• a maximum voltage detection unit for detecting a voltage from each of the light emitting elements of each of the pixels and outputting a maximum voltage that has a highest voltage level among the detected voltages;
• a timing controller for outputting a highest gray level image data signal having a highest gray level among image data signals applied to the plurality of pixels;
• a compensation voltage selection unit for storing compensation voltages corresponding to respective gray levels of a plurality of image data signals and selecting a compensation voltage corresponding to the highest gray level image data signal;
• a compensation voltage update unit for correcting the compensation voltage of the compensation voltage selection unit corresponding to the highest gray level image data signal based on the maximum voltage;
• and
• a power supply unit for correcting a first driving voltage based on the compensation voltage selected by the compensation voltage selection unit and applying the corrected first driving voltage to the first power line,
• wherein, when the number of image data signals having a lower gray level than a reference gray level among the image data signals applied to the plurality of pixels exceeds a threshold value, the timing controller further generates a holding signal and applies the holding signal to the compensation voltage update unit.

A light emitting display device, comprising:

• a display panel comprising a plurality of pixels, each of the plurality of pixels comprising a driving switching element connected to a first power line and a light emitting element connected to a second power line;
• a power supply unit for applying a power to the first power line;
• and
• a diode directly connected to an anode electrode of the light emitting element disposed in at least one pixel, a driving transistor of the at least one pixel, and a feedback input terminal of the power supply unit, wherein a resistor is connected between the diode and the second power line.