Organic Light Emitting Display Device, System Including Organic Light Emitting Display Device and Method of Driving Organic Light Emitting Display Device
An organic light emitting display device includes a pixel unit, a scan driver, a data driver and a voltage generation unit. The pixel unit includes a plurality of pixels coupled to a plurality of scan lines and a plurality of data lines, where each of the pixels includes an organic light emitting diode. The voltage generation unit is coupled to the pixel unit through one power line which provides the common supply voltage to the pixels. Each of the plurality of pixels includes a voltage drop unit, each voltage drop unit generates a respective drive voltage by dropping a voltage of the common supply voltage, and turns on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the drive voltage based on a logic level of the data signal. The organic light emitting display device increases an aperture ratio.
1 . An organic light emitting display device, comprising:
a pixel unit including a plurality of pixels coupled to a plurality of scan lines and a plurality of data lines, each of the plurality of pixels including an organic light emitting diode and turning on the organic light emitting diode to emit light using a common supply voltage;
a scan driver configured to provide a scan signal to the plurality of pixels through the plurality of scan lines;
a data driver configured to provide a data signal to the plurality of pixels through the plurality of data lines, the data signal having one of a first logic level and a second logic level; and
a voltage generation unit coupled to the pixel unit through one power line, the voltage generation unit providing the common supply voltage to the plurality of pixels through the one power line.
2 . The organic light emitting display device of claim 1 , wherein each of the plurality of pixels includes a voltage drop unit, each voltage drop unit generates a respective drive voltage by dropping a voltage of the common supply voltage, and turns on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the drive voltage based on a logic level of the data signal.
3 . The organic light emitting display device of claim 2 , wherein the plurality of pixels include a red pixel, a green pixel and a blue pixel, and
wherein the voltage drop units included in the red pixel, the green pixel and the blue pixel generate the respective drive voltages, the respective drive voltages having different voltages from each other.
4 . The organic light emitting display device of claim 3 , wherein the voltage drop unit includes a metal oxide semiconductor (MOS) transistor connected to the common supply voltage.
5 . The organic light emitting display device of claim 4 , wherein aspect ratios of the MOS transistors included in the red pixel, the green pixel and the blue pixel are different from each other.
6 . The organic light emitting display device of claim 3 , wherein the voltage drop unit includes a resistor connected to the common supply voltage.
7 . The organic light emitting display device of claim 6 , wherein resistances of the resistors included in the red pixel, the green pixel and the blue pixel are different from each other.
8 . The organic light emitting display device of claim 1 , wherein each of the plurality of pixels comprises:
an organic light emitting diode having a cathode connected to a ground voltage;
a first p-type metal oxide semiconductor (PMOS) transistor having a gate electrode, a first electrode and a second electrode coupled to an anode of the organic light emitting diode;
a voltage drop unit generating a drive voltage by dropping a voltage of the common supply voltage and providing the drive voltage to the first electrode of the first PMOS transistor;
a second PMOS transistor having a first electrode coupled to the data line, a second electrode coupled to the gate electrode of the first PMOS transistor and a gate electrode coupled to the scan line; and
a storage capacitor coupled between the gate electrode of the first PMOS transistor and the first electrode of the first PMOS transistor.
9 . The organic light emitting display device of claim 8 , wherein the plurality of pixels include a red pixel, a green pixel and a blue pixel, and
wherein the voltage drop units included in the red pixel, the green pixel and the blue pixel generate the drive voltages having different voltages from each other.
10 . The organic light emitting display device of claim 9 , wherein the voltage drop units included in the red pixel, the green pixel and the blue pixel provide loads having different resistances from each other between the common supply voltage and the first electrode of the first PMOS transistor.
11 . The organic light emitting display device of claim 9 , wherein the voltage drop unit includes a third PMOS transistor having a first electrode connected to the common supply voltage, a second electrode coupled to the first electrode of the first PMOS transistor and a gate electrode coupled to the second electrode of the second PMOS transistor.
12 . The organic light emitting display device of claim 11 , wherein aspect ratios of the third PMOS transistors included in the red pixel, the green pixel and the blue pixel are different from each other.
13 . The organic light emitting display device of claim 9 , wherein the voltage drop unit includes a resistor coupled between the common supply voltage and the first electrode of the first PMOS transistor.
14 . The organic light emitting display device of claim 13 , wherein resistances of the resistors included in the red pixel, the green pixel and the blue pixel are different from each other.
15 . The organic light emitting display device of claim 1 , wherein each of the plurality of pixels comprises:
an organic light emitting diode having a cathode connected to a ground voltage;
a first p-type metal oxide semiconductor (PMOS) transistor having a gate electrode, a first electrode and a second electrode coupled to an anode of the organic light emitting diode;
a voltage drop unit generating a drive voltage by dropping a voltage of the common supply voltage and providing the drive voltage to the first electrode of the first PMOS transistor;
a second PMOS transistor having a first electrode coupled to the data line, a second electrode coupled to the gate electrode of the first PMOS transistor and a gate electrode coupled to the scan line; and
a storage capacitor coupled between the gate electrode of the first PMOS transistor and the common supply voltage.
16 . A method of driving an organic light emitting display device that includes a plurality of pixels coupled to a plurality of scan lines and a plurality of data lines and including an organic light emitting diode, comprising:
providing a common supply voltage to the plurality of pixels through one power line;
providing a scan signal to the plurality of pixels through the plurality of scan lines;
providing a data signal to the plurality of pixels through the plurality of data lines, the data signal having one of a first logic level and a second logic level;
at pixels among the plurality of pixels that receive the data signal having the first logic level, generating a drive voltage by dropping a voltage of the common supply voltage and turning on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the drive voltage; and
at pixels among the plurality of pixels that receive the data signal having the second logic level, turning off the organic light emitting diode.
17 . The method of claim 16 , wherein the plurality of pixels include a red pixel, a green pixel and a blue pixel, and
wherein generating the drive voltage by dropping a voltage of the common supply voltage and turning on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the drive voltage comprises:
at the red pixel that receives the data signal having the first logic level, generating a first drive voltage by dropping a voltage of the common supply voltage and turning on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the first drive voltage;
at the green pixel that receives the data signal having the first logic level, generating a second drive voltage by dropping a voltage of the common supply voltage and turning on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the second drive voltage; and
at the blue pixel that receives the data signal having the first logic level, generating a third drive voltage by dropping a voltage of the common supply voltage and turning on the organic light emitting diode to emit light with a luminance corresponding to a voltage of the third drive voltage.
18 . The method of claim 17 , wherein the red pixel generates the first drive voltage by dropping a voltage of the common supply voltage using a first MOS transistor, the green pixel generates the second drive voltage by dropping a voltage of the common supply voltage using a second MOS transistor, and the blue pixel generates the third drive voltage by dropping a voltage of the common supply voltage using a third MOS transistor, and
wherein aspect ratios of the first MOS transistor, the second MOS transistor and the third MOS transistor are different from each other.
19 . The method of claim 17 , wherein the red pixel generates the first drive voltage by dropping a voltage of the common supply voltage using a first resistor, the green pixel generates the second drive voltage by dropping a voltage of the common supply voltage using a second resistor, and the blue pixel generates the third drive voltage by dropping a voltage of the common supply voltage using a third resistor, and
wherein resistances of the first resistor, the second resistor and the third resistor are different from each other.
20 . A system, comprising:
a storage device configured to store video data;
an organic light emitting display device configured to display the video data; and
a processor configured to control the storage device and the organic light emitting display device,
wherein the organic light emitting display device comprises:
a pixel unit including a plurality of pixels coupled to a plurality of scan lines and a plurality of data lines, each of the plurality of pixels including an organic light emitting diode and turning on the organic light emitting diode to emit light using a common supply voltage;
a scan driver configured to provide a scan signal to the plurality of pixels through the plurality of scan lines;
a data driver configured to provide a data signal to the plurality of pixels through the plurality of data lines, the data signal having one of a first logic level and a second logic level; and
a voltage generation unit coupled to the pixel unit through one power line, the voltage generation unit providing the common supply voltage to the plurality of pixels through the one power line.