Method for making an OLED device
View Patent ↗An AC powered light emitting device is provided. The device includes a plurality of organic light emitting diode (OLED) modules. The modules are arranged into groups of modules where the individual modules of the groups are electrically connected in series. The device may be powered using AC power. A display is also provided. The display includes a plurality of OLED modules arranged to spell out a letter or depict an image.
1. A method of making a light emitting device comprising:
providing a substrate;
forming a first conducting material over the substrate;
forming an organic light emitting material over at least part of the first conducting material;
forming a second conducting material over at least part of the organic light emitting material; and
patterning the first conducting material, organic light emitting material, and second conducting material to form a plurality of organic light emitting diode (OLED) modules, each OLED module being disposed on said substrate, each OLED module further having a first electrode formed from the patterned first conducting material, a light emitting layer formed from the organic light emitting material, and a second electrode formed from the patterned second conducting material, the first and second electrodes of respective OLED modules electrically connected to electrically connect the OLED modules in series.
2. The method of claim 1 , wherein the first conducting material comprises a conducting material which is transparent to light emitted by the light emitting device.
3. The method of claim 2 , wherein the first conducting material comprises indium tin oxide.
4. The method of claim 1 , wherein the forming the first conducting material comprises:
forming a first conducting electrode material; and
forming a first conducting interconnect material.
5. The method of claim 4 , wherein the patterning the first conducting material comprises:
patterning the first conducting electrode material to form the first electrodes; and
patterning the first conducting interconnect material to form respective interconnects electrically connected to the respective first electrodes.
6. The method of claim 4 wherein the patterning the second conducting material forms respective second electrodes electrically connected to respective interconnects.
7. The method of claim 4 , wherein the forming the first conducting interconnect material comprises:
sputtering the first conducting interconnect material.
8. The method of claim 1 , wherein the forming the first conducting material comprises sputtering at least part of the first conducting material.
9. The method of claim 1 , wherein the patterning the first conducting material comprises etching the first conducting material.
10. The method of claim 1 , wherein the forming and patterning the first conducting material comprises:
selectively depositing the first electrode material.
11. The method of claim 1 , wherein the first conducting material is a single material.
12. The method of claim 1 , wherein the forming and patterning the organic light emitting material comprises:
evaporating the organic light emitting material through a shadow mask.
13. The method of claim 1 , wherein the forming and patterning the organic light emitting material comprises:
depositing the organic light emitting material over the substrate; and
etching the deposited organic light emitting material to form the light emitting layer.
14. The method of claim 1 , wherein the forming and patterning the organic light emitting material comprises:
selectively depositing the organic light emitting material over the substrate to form the light emitting layer.
15. The method of claim 1 , wherein the forming and patterning the second conducting material comprises:
evaporating the second conducting material through a shadow mask.
16. The method of claim 1 , wherein the forming and patterning the second conducting material comprises:
depositing the second conducting material over the substrate; and
etching the deposited second conducting material.
17. The method of claim 1 , wherein the step of forming the first conducting material comprises:
forming a first electrode component; and
forming a first interconnect component.
18. The method of claim 17 , wherein forming the first electrode component and forming the first interconnect component are performed in a single patterning step.
19. A method of making a light emitting device comprising:
providing a substrate;
forming a first conducting material over the substrate;
forming an organic light emitting material over at least part of the first conducting material;
forming a second conducting material over at least part of the organic light emitting material; and
forming a plurality of organic light emitting diode (OLED) series groups on the substrate, each OLED series group comprising a plurality of OLED modules, the OLED modules of each OLED series group electrically connected in series, wherein each OLED series group is disposed on the substrate and wherein the OLED modules emit light upon application of an AC voltage.