Display Electrode Layout With Bank Cut Lines Against Pixel Defects
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Solution Overview
Problem
In display elements with linearly shaped cathode electrodes, disconnection issues lead to pixel defects, which existing configurations fail to adequately address.
Innovation Solution
A display element design featuring a flattening film, lower reflective electrodes, inversely tapered banks, active layers, and an upper transparent electrode, where cut lines with reduced height facilitate electrical connections between adjacent active layers, reducing the likelihood of pixel defects even if the upper transparent electrode is disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a linear-shaped cathode electrode is used, then the display element structure is simplified, but pixel defects occur when the electrode is disconnected
Solution Approach 1:
The cathode electrode is divided into multiple segments corresponding to different sub-pixels (red, green, blue). Each segment is independently formed on its respective active layer, allowing localized defects to be contained within individual segments rather than affecting the entire electrode structure.
Solution Approach 2:
The cathode electrode is formed before the encapsulation process, allowing the electrode pattern to be established while the surrounding structure is still being built. This preliminary formation ensures proper alignment and reduces the risk of disconnection during subsequent manufacturing steps.
2Reliability
If the upper transparent electrode is disconnected, then electrical connection is lost, but continuous power supply is needed
Solution Approach 1:
The cathode electrode structure is designed with different properties in different regions: the electrode material provides electrical conductivity where needed, while the bank structure provides mechanical support and isolation where required. This local differentiation ensures electrical connection continuity while maintaining structural integrity.
Solution Approach 2:
The bank structure acts as an intermediary element between the cathode electrode and the active layer. It provides both mechanical support and electrical isolation, ensuring that the electrode remains properly positioned and connected while preventing unwanted electrical interactions with adjacent structures.
Data Source
AI summary
Provided is a display element according to an aspect of the disclosure including a flattening film and, on the flattening film, a plurality of banks each having a linear shape, a plurality of active layers each having a linear shape and formed between adjacent banks, and an upper transparent electrode formed on each of the plurality of active layers. A cut line having a locally reduced height with reference to the flattening film is formed in each the plurality of banks, and the upper transparent electrode formed on one of the adjacent active layers and the upper transparent electrode formed on the other of the adjacent active layers are electrically connected via a conductive electrode formed in the cut line.