Pixel driving circuit for a display device and a driving method thereof

A pixel driving circuit for a display device comprising:

• red, green and blue EL devices, each having a first electrode and a second electrode;
• a switching transistor for sequentially transmitting red, green and blue data signals;
• and
• a plurality of driving devices connected to the switching transistor to drive the red, green and blue EL devices in response to the red, green and blue data signals sequentially received through the switching transistor,
• wherein each said first electrode is connected to a corresponding one of the plurality of driving devices, and each said second electrode is connected to a second power source control part, such that the red, green and blue EL devices are sequentially emitted in response to driving signals transmitted by the driving devices in response to second power source signals transmitted from the second power source control part.

A pixel driving circuit for a display device comprising:

• red, green and blue EL devices, each having a first electrode and a second electrode;
• a switching transistor for sequentially transmitting red, green and blue data signals;
• a driving transistor connected to the switching transistor to sequentially drive the red, green and blue EL devices in response to the red, green and blue data signals;
• and
• storage means for storing the red, green and blue data signals,
• wherein the first electrodes of the EL devices are commonly connected to the driving transistor, and each said second electrode is connected to a second power source control part, such that the red, green and blue EL devices are sequentially emitted in response to the driving signals transmitted through the driving transistors in response to second power source signals received from the second power source control part.

An organic electroluminescent display device comprising a pixel driving circuit disposed at an intersection between gate lines and data lines, the pixel driving circuit comprising:

• a first transistor having a gate connected to one of the gate lines, and a source connected to one of the data lines;
• a second transistor having a gate coupled to a drain of the first transistor;
• a first capacitor connected between the gate and the source of the second transistor;
• a third transistor having a gate coupled to the drain of the first transistor;
• a second capacitor connected between the gate and the source of the third transistor;
• a fourth transistor having a gate coupled to the drain of the first transistor;
• a third capacitor connected between the gate and the source of the fourth transistor;
• a first power source line commonly connected to sources of the second, third and fourth transistors;
• red, green and blue EL devices, each having a first electrode connected to the drain of a corresponding one of the second, third and fourth transistors;
• a red second power source line connected to a second electrode of the red EL device;
• a green second power source line connected to a second electrode of the green EL device;
• and
• a blue second power source line connected to a second electrode of the blue EL device.

An organic electroluminescent display device comprising a pixel driving circuit disposed at an intersection between gate lines and data lines, the pixel driving circuit comprising:

• a first transistor having a gate connected to one of the gate lines, and a source connected to one of the data lines;
• a second transistor having a gate connected to a drain of the first transistor, and a source connected to a power source line;
• a capacitor connected between the gate of the second transistor and the power source line;
• red, green and blue EL devices, each having a first electrode connected to the drain of the second transistor;
• a red second power source line connected to a second electrode of the red EL device;
• a green second power source line connected to a second electrode of the green EL device;
• and
• a blue second power source line connected to a second electrode of the blue EL device.

A driving method for a display device comprising a plurality of gate lines, a plurality of data lines, a plurality of power source lines, a plurality of second power source lines, and a plurality of pixels, each pixel being connected to a corresponding one of the gate lines, a corresponding one of the data lines, a corresponding one of the power source lines, and a corresponding one of the second power source lines, each pixel comprising at least red, green and blue light emitting elements, the method comprising:

• generating scan signals per a sub-period of time in a period of time to the corresponding one of the gate lines;
• sequentially applying red, green and blue data to the corresponding one of the data lines whenever the scan signals are generated so that red, green and blue driving signals are generated to the corresponding one of the data lines;
• and
• sequentially driving the at least red, green and blue light emitting elements of the pixel connected to the corresponding one of the gate lines using second power source signals sequentially applied from a second power source control part, thereby realizing a certain color for the sub-period of time in the period of time.