Organic light emitting display apparatus
View Patent ↗An organic light emitting display apparatus has a hybrid structure in which resonance red, green and blue pixels and a non-resonance white pixel are combined. An optical path control layer and a white color filter which selectively absorbs light having a specific wavelength are included in the white pixel. Thus, the organic light emitting display apparatus has a large viewing angle, low power consumption, and long lifetime.
1. An organic light emitting display apparatus, comprising:
red, green and blue pixels which each comprise a semi-transparent electrode, a reflection electrode facing the semi-transparent electrode, and an emissive layer interposed between the semi-transparent electrode and the reflection electrode;
a white pixel which comprises a transparent electrode, a reflection electrode facing the transparent electrode, and an emissive layer interposed between the transparent electrode and the reflection electrode;
red, green, blue and white color filters disposed in correspondence to each of the red, green, blue and white pixels; and
an optical path control layer disposed at least between the transparent electrode and the white color filter in the white pixel.
2. The organic light emitting display apparatus of claim 1 , wherein the optical path control layer has a refraction index difference of within 10% relative to that of the transparent electrode of the white pixel.
3. The organic light emitting display apparatus of claim 1 , wherein the optical path control layer has a refractive index in a range of 1.8 and 2.0 in a visible light region.
4. The organic light emitting display apparatus of claim 1 , wherein the optical path control layer has an optical transmittance of greater than 90% in a visible light region.
5. The organic light emitting display apparatus of claim 1 , wherein the optical path control layer is formed of at least one material combination selected from the group consisting of an organic material, an oxide and a sulphide.
6. The organic light emitting display apparatus of claim 5 , wherein the optical path control layer is formed of at least one material combination selected from the group consisting of Al 2 O 3 , BaO, MgO, HfO 2 , ZrO 2 , CaO 2 , SrO 2 , Y 2 O 3 , Si 3 N 4 , AlN, GaN, ZnS and CdS.
7. The organic light emitting display apparatus of claim 1 , wherein the optical path control layer is disposed between the semi-transparent electrode of the red, green and blue pixels and the red, green and blue color filters.
8. The organic light emitting display apparatus of claim 1 , wherein the white color filter selectively absorbs a specific wavelength.
9. The organic light emitting display apparatus of claim 8 , wherein the white color filter selectively absorbs a specific wavelength so that the difference of Cx and Cy values of white light required by a panel and that of white light generated from the white pixel is within ±0.03.
10. The organic light emitting display apparatus of claim 8 , wherein the white color filter includes means for performing a neutral density (ND) filter function so as to control an intensity of light.
11. The organic light emitting display apparatus of claim 1 , wherein the semi-transparent electrode comprises a transparent electrode and a semi-transparent film formed under the transparent electrode.
12. The organic light emitting display apparatus of claim 11 , wherein the semi-transparent film is formed of at least one material selected from the group consisting of ITO/Ag/ITO, ITO/Ag/IZO, ATD and ITO/APC/ITO.
13. The organic light emitting display apparatus of claim 11 , wherein optical distances between the semi-transparent electrode and the reflection electrode of each of the red, green and blue pixels are controlled by controlling a thickness of the transparent electrode.
14. The organic light emitting display apparatus of claim 11 , wherein the transparent electrode is of at least one material selected from the group consisting of ITO, IZO, ZnO and In 2 O 3 .
15. The organic light emitting display apparatus of claim 1 , wherein the transparent electrode is formed of at least one material selected from the group consisting of ITO, IZO, ZnO and In 2 O 3 .
16. The organic light emitting display apparatus of claim 1 , wherein the emissive layer comprises one of a stacking type and a tandem type.
17. The organic light emitting display apparatus of claim 1 , wherein the emissive layer comprises one of a fluorescent material and a phosphor material.
18. The organic light emitting display apparatus of claim 1 , wherein the organic light emitting display apparatus is of a bottom emission type.
19. The organic light emitting display apparatus of claim 1 , wherein the organic light emitting display apparatus is of a top emission type.