OLED illumination device with improved aperture ratio
An illumination device includes a transparent substrate and multiple first metal lines. The transparent substrate includes an emitting area and a peripheral area and the emitting area includes multiple sub-emitting areas. The first metal lines are disposed on the transparent substrate, each first metal line has an end connected to a corresponding one of the sub-emitting areas and an opposite end connected to the peripheral area. Each sub-emitting area includes an insulating layer, a second metal line and an OLED layer. The second metal line is disposed between the transparent substrate and the OLED layer, the insulating layer is between the first metal lines and the second metal line, each first metal line is overlapped with the second metal line in vertical projection. One of the first metal lines, which is connected to a first one of the sub-emitting areas, passes through a second one of the sub-emitting areas.
1. An illumination device comprising:
a transparent substrate comprising an emitting area and a peripheral area, wherein the peripheral area is disposed at an edge of the transparent substrate, and the emitting area comprising a plurality of sub-emitting areas; and
a plurality of first metal lines disposed on the transparent substrate, each first metal line has an end connected to a corresponding one of the sub-emitting areas and an opposite end connected to the peripheral area,
wherein each sub-emitting area comprises an insulating layer, a second metal line and an OLED layer, and the second metal line is disposed between the transparent substrate and the OLED layer, the insulating layer is between the first metal lines and the second metal line, each first metal line is overlapped with the second metal line in vertical projection, and one of the first metal lines, which is connected to a first one of the sub-emitting areas, passes through a second one of the sub-emitting areas.
2. The illumination device of claim 1 further comprising a driver circuit disposed on the peripheral area.
3. The illumination device of claim 1 further comprising a driver circuit, which is electrically connected to the opposite end of each first metal line within the peripheral area.
4. The illumination device of claim 1 , wherein a number of the first metal lines connected between the peripheral area and a farther one of the sub-emitting areas is greater than a number of the first metal lines connected between the peripheral area and a closer one of the sub-emitting areas.
5. The illumination device of claim 1 , wherein the first metal lines and second metal line are opaque metal lines.
6. The illumination device of claim 1 , wherein the first metal lines and second metal line share an equal width.
7. The illumination device of claim 1 , wherein the first metal line and second metal line are different in respective widths by less than 20%.
8. The illumination device of claim 1 , wherein the first metal lines are in parallel with one another.
9. The illumination device of claim 1 , wherein the first metal lines are different in respective widths by less than 20%.
10. The illumination device of claim 1 , wherein the second metal lines in respective sub-emitting areas are different in respective widths by less than 20%.
11. The illumination device of claim 1 , wherein the insulating layer has a through hole, through which the second metal line is connected to a corresponding one of the first metal lines.
12. The illumination device of claim 1 further comprising a transparent anode layer, which is disposed above the second metal line and disposed between the OLED layer and the second metal line.
13. The illumination device of claim 12 , wherein the insulating layer has a through hole, through which the first metal line is connected to the transparent anode layer.
14. The illumination device of claim 1 , wherein the second metal line within the first one of the sub-emitting areas is insulated from the second metal line within a second one of the sub-emitting areas.
15. The illumination device of claim 1 , wherein the sub-emitting areas generally have the same shape and area.
16. The illumination device of claim 1 , wherein the second metal line is formed as grids or meshes within each sub-emitting area.
17. The illumination device of claim 1 , further comprising an opaque cathode layer, disposed above the OLED layer.
18. The illumination device of claim 1 , wherein one of the first metal lines, which is connected to the first one of the sub-emitting areas, is overlapped with the second metal line, within the second one of the sub-emitting areas, in vertical projection.