Organic light emitting device, method of manufacturing the same, and shadow mask therefor
View Patent ↗The present invention relates to an organic light emitting device, and the organic light emitting device according to an exemplary embodiment of the present invention includes a blue subpixel that is larger than a red subpixel and a green subpixel. The red subpixel and the green subpixel have the same layered structure such that the red subpixel and the green subpixel are formed by using the same shadow mask.
1. An organic light emitting device, comprising:
a red subpixel comprising a pixel electrode, a common electrode and a red organic light emitting member;
a green subpixel comprising a pixel electrode, a common electrode and a green organic light emitting member; and
a blue subpixel comprising a pixel electrode, a common electrode, and a blue organic light emitting member, the blue subpixel having a larger size than the red subpixel, and the blue subpixel having a larger size than the green subpixel,
wherein both of the red organic light emitting member and the green organic light emitting member comprise both of a red emission layer and a green emission layer.
2. The organic light emitting device of claim 1 , wherein
the red subpixel, the green subpixel, and the blue subpixel further comprise a reflecting electrode arranged under the pixel electrode, and
an interval between the reflecting electrode and the common electrode in the red subpixel is different from the interval between the reflecting electrode and the common electrode in the green subpixel.
3. The organic light emitting device of claim 2 , wherein
the thickness of the pixel electrode of the red subpixel is different from the thickness of the pixel electrode of the green subpixel.
4. The organic light emitting device of claim 3 , wherein
the thickness of the pixel electrode of the blue subpixel is the same as the thickness of the pixel electrode of the green subpixel.
5. The organic light emitting device of claim 2 , wherein
the common electrode is a translucent electrode.
6. The organic light emitting device of claim 5 , wherein
the interval between the reflecting electrode and the common electrode is an integer multiple of the wavelength of the corresponding color of the corresponding subpixel.
7. The organic light emitting device of claim 5 , wherein
the reflecting electrode and the translucent electrode in each subpixel comprise a metal of magnesium, aluminum, silver, or an alloy thereof, and
the translucent electrode is thinner than the reflecting electrode.
8. The organic light emitting device of claim 1 , further comprising
a middle layer arranged between the red emission layer and the green emission layer to block interference between the red emission layer and the green emission layer.
9. The organic light emitting device of claim 1 , wherein the blue organic light emitting member comprises a hole injection layer, a hole transport layer, a blue emission layer, an electron transport layer, and an electron injection layer that are sequentially disposed.
10. The organic light emitting device of claim 1 , wherein
one red subpixel, one green subpixel, and one blue subpixel form a unit pixel, and
the red emission layer and the green emission layer are deposited between the red subpixel and the green subpixel that form the unit pixel.
11. An organic light emitting device comprising:
a red subpixel comprising a pixel electrode, a common electrode, and a red organic light emitting member;
a green subpixel comprising a pixel electrode, a common electrode, and a green organic light emitting member; and
a blue subpixel comprising a pixel electrode, a common electrode, and a blue organic light emitting member, the blue subpixel having a larger size than the red subpixel, and the blue subpixel having a larger size than the green subpixel,
wherein both of the red organic light emitting member and the green organic light emitting member comprise both of a red emission layer and a green emission layer, and
one red subpixel, one green subpixel, and one blue subpixel form a unit pixel, and
a first unit pixel comprises the red subpixel and the green subpixel, which are alternately arranged according to a first column, and the blue subpixel, which is arranged according to a second column, and
a second unit pixel that is symmetrical in left and right directions.
12. The organic light emitting device of claim 1 , wherein
a width of the blue subpixel is same as the width of the red subpixel or the green pixel.
13. The organic light emitting device of claim 1 , wherein
a length of the blue subpixel is 1.5 to 2 times its width.
14. The organic light emitting device of claim 2 , wherein
the interval between the reflecting electrode and the common electrode in the red subpixel is equivalent to a total thickness of the pixel electrode of the red subpixel and the red organic light emitting member, and
the interval between the reflecting electrode and the common electrode in the green subpixel is equivalent to a total thickness of the pixel electrode of the green subpixel and the green organic light emitting member.
15. The organic light emitting device of claim 1 , wherein
the red emission layer and the green emission layer in the red organic light emitting member contact each other, and
the red emission layer and the green emission layer in the green organic light emitting member contact each other.