Auxiliary Electrode for OLED Lateral Leakage Control
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Solution Overview
Problem
As the resolution of organic light emitting display devices increases, it becomes challenging to prevent lateral leakage currents from adjacent subpixels, leading to unintended light emission and color mixture, which affects display quality and reliability.
Innovation Solution
Incorporating an auxiliary electrode between the protective layer and the planarizing layer, electrically connected to the organic layer through a contact hole, to redirect lateral leakage currents and prevent unwanted light emission from adjacent subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of organic light emitting display devices is increased, then the display quality is improved, but lateral leakage currents from adjacent subpixels occur leading to unintended light emission and color mixture
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary component between the first electrode and the organic layer. This auxiliary electrode serves as a mediator to collect and redirect lateral leakage currents away from adjacent subpixels, preventing unintended light emission and color mixture while enabling higher display resolution
Solution Approach 2:
The harmful lateral leakage currents are extracted and redirected through the auxiliary electrode. By providing a dedicated current collection path through the auxiliary electrode connected to the transporting layer, the patent removes the harmful effect of lateral leakage from adjacent subpixels
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The auxiliary electrode effectively reduces lateral leakage currents, preventing unintended subpixel emission and color mixture, thereby enhancing the display quality and reliability of organic light emitting display devices.
Implementation Method 1
the auxiliary electrode directly connected to the transporting layer
Implementation Method 2
emits light when an exciton generated by recombination of the injected holes and electrons changes its state from an excited state to a ground state
Data Source
AI summary
Embodiments disclosed herein relate to a light emitting display device comprising a plurality of subpixels, the plurality of subpixels including at least a first subpixel and a second subpixel. The light emitting display device includes a common layer shared by a first light emitting diode of the first subpixel and a second light emitting diode of the second subpixel, the common layer disposed between a first anode electrode and a first cathode electrode of the first subpixel and between a second anode electrode and a second cathode electrode of the second subpixel, and an auxiliary electrode disposed on a different layer from the common layer, the first anode electrode, the first cathode electrode, the second anode electrode, and the second cathode electrode, the auxiliary electrode connected to the common layer through a contact hole.