Organic light emitting diode display
View Patent ↗An OLED display includes a pixel electrode on a substrate, an organic emission layer on the pixel electrode, a first common electrode on the organic emission layer, a transmission layer on the first common electrode, a second common electrode on the transmission layer, a selective reflective layer on the second common electrode, a polarizing plate on the selective reflective layer, and a phase delay plate between the polarizing plate and the second common electrode.
1. An organic light emitting diode (OLED) display comprising:
a pixel electrode on a substrate;
an organic emission layer on the pixel electrode;
a first common electrode on the organic emission layer;
a transmission layer on the first common electrode;
a second common electrode on the transmission layer;
a selective reflective layer on the second common electrode;
a polarizing plate on the selective reflective layer; and
a phase delay plate between the polarizing plate and the second common electrode.
2. The OLED display as claimed in claim 1 , wherein the selective reflective layer is a cholesteric liquid crystal (CLC) layer, and the phase delay plate is between the polarizing plate and the CLC layer.
3. The OLED display as claimed in claim 2 , wherein the CLC layer transmits one of left circularly polarized light and right circularly polarized light and reflects the other.
4. The OLED display as claimed in claim 3 , wherein light that is linearly polarized after passing through the polarizing plate is circularly polarized after passing through the phase delay plate.
5. The OLED display as claimed in claim 4 , wherein the phase delay plate is a ¼ wavelength plate, and an angle of intersection between an optic axis of the phase delay plate and a polarization axis of the polarizing plate is 45 degrees.
6. The OLED display as claimed in claim 1 , wherein the selective reflective layer is a dual brightness enhancement film (DBEF) and the phase delay plate is between the second common electrode and the DBEF.
7. The OLED display as claimed in claim 6 , wherein the polarizing plate and the DBEF have the same polarization axis.
8. The OLED display as claimed in claim 7 , wherein light that is linearly polarized after passing through the DBEF is circularly polarized after passing through the phase delay plate.
9. The OLED display as claimed in claim 8 , wherein the phase delay plate is a ¼ wavelength plate, and an angle of intersection between an optic axis of the phase delay plate and a polarization axis of the polarizing plate is 45 degrees.
10. The OLED display as claimed in claim 1 , wherein one of the first common electrode and the second common electrode is formed as a transflective layer.
11. The OLED display as claimed in claim 10 , wherein the transflective layer includes at least one of magnesium (Mg), silver (Ag), calcium (Ca), lithium (Li), chromium (Cr), and aluminum (Al).
12. The OLED display as claimed in claim 1 , further comprising a pixel defining layer having an opening that exposes the pixel electrode and is formed on the substrate member.
13. The OLED display as claimed in claim 12 , wherein the pixel defining layer has a black or grey-based color.
14. The OLED display as claimed in claim 12 , wherein the pixel defining layer is disposed under the first common electrode.
15. The OLED display as claimed in claim 1 , wherein the phase delay plate is between the polarizing plate and the selective reflective layer.
16. The OLED display as claimed in claim 1 , wherein the phase delay plate is between the second common electrode and the selective reflective layer.
17. The OLED display as claimed in claim 1 , wherein the transmission layer is directly on the first common electrode and the second common electrode is directly on the transmission layer.
18. An optical member for use with an organic light emitting diode (OLED) display including a pixel electrode on a substrate, an organic emission layer on the pixel electrode, a first common electrode on the organic emission layer, a transmission layer on the first common electrode, a second common electrode on the transmission layer, the optical member comprising:
a selective reflective layer to be positioned adjacent the second common electrode;
a polarizing plate on the selective reflective layer; and
a phase delay plate between the polarizing plate and the second common electrode.
19. The optical member as recited in claim 18 , wherein the OLED display includes a sealing member, the optical member being on the sealing member.
20. The optical member as recited in claim 18 , wherein the OLED display includes a sealing member, the optical member being between the sealing member and the second common electrode.