Color OLED display with a larger aperture ratio
A method of making an OLED device includes providing a first undercut lift-off structure over the device substrate having a first array of bottom electrodes. Next, one or more first organic EL medium layers including at least a first light-emitting layer are deposited over the first undercut lift-off structure and over the first array of bottom electrodes. The first undercut lift-off structure and overlying first organic EL medium layer(s) are removed by treatment with a first lift-off agent comprising a fluorinated solvent to form a first intermediate structure. The process is repeated using a second undercut lift-off structure to deposit one or more second organic EL medium layers over a second array of bottom electrodes. After removal of the second undercut lift-off structure, a common top electrode is provided in electrical contact with the first and second organic EL medium layers.
1. A full color OLED display comprising:
a substrate having a display region, the display region including an array of first, second and third organic EL elements, each array having individually patterned light-emitting layers for emission of differently colored light,
wherein the display region has an aperture ratio of greater than about 60% and a resolution of greater than about 600 ppi.
2. The OLED display of claim 1 , wherein the aperture ratio is greater than about 70%.
3. The OLED display of claim 1 , wherein the display region has a resolution of greater than about 700 ppi.
4. The OLED display of claim 1 , wherein the display region has a resolution of greater than about 800 ppi.
5. The OLED display of claim 1 , wherein each of the first, second and third organic elements are less than about 25 microns in size in any dimension.
6. The OLED display of claim 1 , wherein each of the first, second and third organic elements are less than about 15 microns in size in any dimension.
7. The OLED display of claim 1 , wherein each of the first, second and third organic elements are less than about 5 microns in size in any dimension.
8. The OLED display of claim 1 , wherein the first, second and third organic EL elements emit red, green, and blue light, respectively.
9. The OLED display of claim 1 , wherein the combined emissive area of a first, second, and third organic EL element is less than about 1100 square microns.
10. The OLED display of claim 1 , wherein the combined emissive area of a first, second, and third organic EL element is less than about 500 square microns.
11. A full color OLED display comprising:
a substrate having a display region, the display region including an array of first, second and third sub-pixels, each array having individually patterned light-emitting layers for emission of differently colored light,
wherein each of the first, second and third sub-pixels has a size of less than about 25 microns in any dimension and the display region has an aperture ratio of greater than about 60%.
12. The OLED display of claim 11 , wherein each of the first, second and third sub-pixels has a size of less than about 20 microns in any dimension.
13. The OLED display of claim 11 , wherein each of the first, second and third sub-pixels has a size of less than about 15 microns in any dimension.
14. The OLED display of claim 11 , wherein each of the first, second and third sub-pixels are spaced apart from each other by less than about 5 microns.
15. The OLED display of claim 11 , wherein the first, second and third sub-pixels comprise a unit cell having a display region area of less than about 1100 square microns.
16. A top-emitting full color OLED display comprising:
an active-matrix substrate having a display region, the display region including an array of first, second and third organic EL elements, each array having individually patterned light-emitting layers for emission of differently colored light; and
a transparent or translucent top electrode disposed above the EL elements,
wherein the display region has an aperture ratio of greater than about 60% and a resolution of greater than about 600 ppi.