Organic light emitting display panel having sub-pixels with different coupling capacitors

1. An organic light emitting display panel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel, each of the first and second sub-pixels comprising:

a switching transistor connected to a data line, and having a gate electrode configured to receive a scan signal;

a driving transistor connected to the switching transistor;

an emission control transistor connected to the driving transistor, and having a gate electrode configured to receive an emission control signal;

an emission control line of which a part is the gate electrode of the emission control transistor;

an organic light emitting diode electrically connected to the driving transistor through a via hole; and

a coupling capacitor comprising:

a first electrode comprising a portion of the emission control line; and

a second electrode comprising a first electrode layer of the organic light emitting diode overlapping the portion of the emission control line,

wherein capacitances of the coupling capacitors of the first and second sub-pixels are different.

2. The panel of claim 1 , wherein an entire width of the emission control line overlaps the second electrode of a first capacitor comprising the coupling capacitor of the first sub-pixel and the second electrode of a second capacitor comprising the coupling capacitor of the second sub-pixel.

3. The panel of claim 1 , wherein the first electrode further comprises at least a portion of the gate electrode of the emission control transistor.

4. The panel of claim 1 , wherein the first sub-pixel is configured to emit red color light,

wherein the second sub-pixel is configured to emit blue color light,

wherein the third sub-pixel is configured to emit green color light, and

wherein an emission efficiency of the third sub-pixel is higher than an emission efficiency of each of the first and second sub-pixels.

5. The panel of claim 1 , wherein the emission control transistor is configured to receive the emission control signal that swings between an inactive level and an active level during an emission period within a frame period, the emission period comprising a period in which the organic light emitting diode is configured to emit light.

6. The panel of claim 5 , wherein the coupling capacitor is configured to raise a voltage of an anode of the organic light emitting diode by coupling based on the emission control signal swing.

7. The panel of claim 1 , wherein each of the first and second sub-pixels further comprises a storage capacitor, the storage capacitor comprising:

a first electrode comprising a gate electrode of the driving transistor; and

a second electrode comprising a conductive pattern overlapping the first electrode of the storage capacitor.

8. The panel of claim 7 , wherein each of the first and second sub-pixels further comprises:

a compensation transistor connected to the driving transistor for compensating a threshold voltage of the driving transistor, and comprising a gate electrode configured to receive the scan signal.

9. The panel of claim 8 , wherein each of the first and second sub-pixels further comprises:

an initialization transistor connected to the gate electrode of the driving transistor, and comprising a gate electrode configured to receive an initialization signal to transmit an initialization voltage to the gate electrode of the driving transistor; and

a bypass transistor connected to an anode of the organic light emitting diode, and comprising a gate electrode configured to receive a bypass control signal to transmit the initialization voltage to the anode.

10. The panel of claim 1 , wherein the first through third sub-pixels are arranged in a pentile structure.

11. The panel of claim 1 , wherein the first through third sub-pixels are arranged in a stripe structure.