Using prismatic microstructured films for image blending in OLEDS
View Patent ↗An apparatus such as a light source is disclosed which has an OLED device and a microstructured film disposed on the substrate or transparent electrode of said OLED device and on the exterior of said OLED device. The microstructured film contains features which diffuse light emitted by said OLED device and increase the luminance of the device.
1. An apparatus, comprising:
an OLED device formed as a striped OLED device having neighboring emissive stripes capable of emitting light, the OLED device comprising a light emitting layer and a transparent layer capable of at least partially transmitting light from said light emitting layer and out from the OLED device; and
a microstructured film disposed over said transparent layer and on the exterior of said OLED device, said microstructured film having a plurality of features located distal to said transparent layer and on the outer side of said film, said features capable of diffusing said transmitted light, wherein
the features are arranged in repeating rows across the film; and
the neighboring emissive stripes of the swiped OLED device are aligned parallel to the rows of the features.
2. The apparatus of claim 1 wherein said transparent layer is a substrate of said OLED device.
3. The apparatus of claim 1 wherein said each of features are prismatic in geometry.
4. The apparatus of claim 1 wherein said features are periodic across said film.
5. The apparatus of claim 1 wherein said microstructured film is attached physically and/or chemically to said transparent layer.
6. The apparatus of claim 1 wherein said device is part of light source application.
7. The apparatus of claim 1 wherein said transparent layer is an anode layer of said OLED device.
8. The apparatus of claim 1 wherein the width between one row and a next row of the repeating rows is smaller than the width of an emissive stripe of the emissive stripes of said striped OLED device.
9. The apparatus of claim 1 wherein each of said features are wavelike in geometry.
10. The apparatus of claim 1 wherein said film blends the light of an emissive stripe of said striped OLED device with light of an adjacent emissive stripe of said striped OLED device.
11. The apparatus of claim 1 wherein the microstructured film has a thickness from about 50 microns to 400 microns.
12. The apparatus of claim 1 wherein the neighboring emissive stripes emit light in red, green or blue from adjacent emissive stripes, respectively.
13. The apparatus of claim 1 wherein a width of features from row to row is about 1/10 th a width of an emissive stripe of the striped OLED device.