Active matrix organic light emitting device having organic thin film transistor disposed on organic light emitting diode structure
View Patent ↗A bottom-surface emitting organic light emitting device and a method of manufacturing the organic light emitting device includes providing a transparent substrate, an organic light emitting diode (“OLED”) that includes a transparent electrode, an organic light emitting layer, and a pixel electrode sequentially stacked on an upper surface of the transparent substrate, a planarization film covering the OLED, and a pixel circuit that drives the OLED using an organic thin film transistor (“OTFT”) located on the planarization film.
1. A bottom-surface emitting organic light emitting device comprising:
a transparent substrate;
an organic light emitting diode structure including a transparent electrode, an organic light emitting layer, and a pixel electrode sequentially stacked on an upper surface of the transparent substrate;
a planarization film covering and planarizing the organic light emitting diode structure and having a planarized upper surface; and
a pixel circuit driving the organic light emitting diode using an organic thin film transistor disposed on the planarized upper surface of the planarization film.
2. The organic light emitting device of claim 1 , wherein light is emitted through a bottom surface of the transparent substrate, the bottom surface opposite the upper surface.
3. The organic light emitting device of claim 1 , wherein a drain electrode of the organic thin film transistor is connected to the pixel electrode of the organic light emitting diode via an interlayer connection unit formed by filling a conductive material in a hole passing through the planarization film.
4. The organic light emitting device of claim 3 , wherein the hole further passes through a gate insulating layer of the organic thin film transistor.
5. The organic light emitting device of claim 1 , wherein the pixel electrode is a metal electrode.
6. The organic light emitting device of claim 1 , wherein the organic light emitting diode comprises a bank unit defining a light emission region and formed vertically on the transparent electrode.
7. The organic light emitting device of claim 1 , wherein the transparent electrode is uninterrupted by a bank unit of the organic light emitting diode, and the transparent electrode is formed on at least substantially an entire surface of the transparent substrate.
8. The organic light emitting device of claim 1 , wherein at least a part of the pixel circuit overlaps with a light emission region of the organic light emitting diode.
9. The organic light emitting device of claim 1 , wherein the transparent electrode of the organic light emitting diode is formed in one body with the entire surface of the transparent substrate.
10. The organic light emitting device of claim 1 , further comprising a protection film preventing the pixel circuit from contacting external air by covering an upper surface of the pixel circuit.
11. The organic light emitting device of claim 1 , wherein the pixel circuit includes a gate electrode formed on the planarized upper surface of the planarization film, a gate insulating layer covering the gate electrode, a drain electrode and a source electrode formed on the gate insulating layer in spaced locations, and an organic semiconductor unit positioned between the source electrode and the drain electrode.
12. The organic light emitting device of claim 11 , further comprising a protection film covering the drain electrode, the source electrode, the organic semiconductor unit, and exposed portions of the gate insulating layer.
13. The organic light emitting device of claim 11 , wherein the drain electrode is electrically connected to the pixel electrode.
14. An active matrix organic light emitting device comprising:
a transparent substrate;
an organic light emitting diode structure including a transparent electrode, an organic light emitting layer, and a pixel electrode sequentially stacked on the transparent substrate;
a planarization film covering and planarizing the organic light emitting diode structure and having a planarized upper surface; and
a pixel circuit driving the organic light emitting diode and including an organic thin film transistor located on the planarized upper surface of the planarization film, wherein a drain electrode of the organic thin film transistor is connected to the pixel electrode of the organic light emitting diode through a hole formed through the planarization film.