OLED Double-Side Emission Electrode Protection
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Solution Overview
Problem
Double-sided emission-type organic light-emitting display devices face issues with dark pixels due to damage of the second lower electrode during the etching process for forming the first lower electrode, leading to incomplete light emission in both the front and back directions.
Innovation Solution
Incorporating a protection member to cover the first lower electrode and using a second lower electrode with a transflective electrode layer, which includes a resonant structure, to prevent damage from etchants and ensure consistent light emission in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a first lower electrode is formed in the top emission region, then light emission in the front direction is improved, but the second lower electrode in the bottom emission region is damaged by etchant causing dark pixels
Solution Approach 1:
The patent divides the lower electrode structure into two separate electrodes: a first lower electrode in the top emission region and a second lower electrode in the bottom emission region. This segmentation allows each electrode to be independently formed and protected, preventing the etchant used for the first electrode from damaging the second electrode, thus resolving the contradiction between improving front light emission and maintaining electrode integrity
Solution Approach 2:
The patent introduces a pixel defining layer as an intermediary protective barrier between the first lower electrode and the second lower electrode. This layer prevents the etchant from reaching and damaging the second lower electrode during the formation process of the first lower electrode, thereby protecting the integrity of the second electrode while allowing the first electrode to be formed for improved front emission
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 solution effectively prevents the generation of dark pixels and enhances light emission in both the front and back directions by protecting the first lower electrode and utilizing a resonant structure for improved light transmission and reflection.
Implementation Method 1
the second lower electrode includes the transflective electrode layer, the OLED device may have a resonant structure including the second lower electrode and the reflection member
Implementation Method 2
the protection member covers the first lower electrode... protect the first lower electrode from an etchant used in a process for forming the second lower electrode
Data Source
AI summary
An organic light emitting display device including a substrate, a first semiconductor element, a first lower electrode, a protection member, a first light emitting layer, a second lower electrode, and a second light emitting layer. The substrate has a first pixel region in which a light is emitted in a first direction, and a second pixel region in which a light is emitted in a second direction that is opposite to the first direction.