Organic light emitting display panel including a plurality of organic and inorganic layers

1. An organic light emitting display panel, comprising:

a first electrode;

a second electrode on the first electrode;

an organic layer between the first electrode and the second electrode and the organic layer including a light emitting layer;

an organic cover layer on the second electrode;

a lower layer between the organic cover layer and the second electrode, wherein the lower layer including a first layer, a second layer, and a third layer, which are different from each other and are sequentially stacked; and

an upper layer on the organic cover layer, and

wherein the first layer contacts the second electrode, and

wherein each of the second layer and the third layer includes a silicon compound.

2. The organic light emitting display panel as claimed in claim 1 , wherein the second layer has a lower reflective index than the first layer, and a difference between the reflective index of the second layer and the reflective index of the first layer is equal to or greater than 0.2.

3. The organic light emitting display panel as claimed in claim 2 , wherein the second layer includes a silicon oxide.

4. The organic light emitting display panel as claimed in claim 3 , wherein the thickness of a second layer is within from about 200 Å to about 600 Å range.

5. The organic light emitting display panel as claimed in claim 3 , wherein the third layer includes silicon oxynitride or silicon nitride.

6. The organic light emitting display panel as claimed in claim 5 , wherein a thickness ratio of the third layer to the second layer when the third layer includes silicon oxynitride is relatively smaller than a thickness ratio of the third layer to the second layer when the third layer includes a silicon nitride.

7. The organic light emitting display panel as claimed in claim 1 , wherein the lower layer further includes a fourth layer between the third layer and the organic cover layer and in contact with the third layer, wherein the fourth layer includes a silicon compound.

8. The organic light emitting display panel as claimed in claim 7 , wherein the fourth layer has higher oxygen content than the third layer.

9. The organic light emitting display panel as claimed in claim 1 , wherein the organic layer further includes a hole control layer between the light emitting layer and the first electrode, and an electron control layer between the light emitting layer and the second electrode, and wherein the first layer include a host material of the hole control layer or the electron control layer.

10. The organic light emitting display panel as claimed in claim 1 , wherein:

the first electrode is provided in plurality;

the light emitting layer includes a first organic pattern on one first electrode among the plurality of first electrodes and generating a first color light, and a second organic pattern disposed on another first electrode among the plurality of first electrodes and generating a second color light different from the first color light,

the first organic pattern and the second organic pattern have thicknesses different from each other and,

a thickness of a first portion of the second layer is substantially the same as a thickness of a second portion of the second layer, the first portion overlaps the first organic pattern and the second portion overlaps the second organic pattern.

11. The organic light emitting display panel as claimed in claim 1 , wherein an optical path of the second layer is defined by a product of a refractive index of the second layer and the thickness of the second layer, wherein the optical path of the second layer is within from about 280 Å to about 900 Å range.