OLED Display Assisting Conductive Layer for Voltage Homogeneity
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Solution Overview
Problem
Conventional OLED display devices face issues with non-uniform in-plane voltage and brightness due to high electrical resistance of the second electrode, leading to mura and other display inconsistencies, especially in large-sized displays.
Innovation Solution
The introduction of an assisting conductive layer on the upper substrate, which is in direct contact with the second electrode on the lower substrate, enhances electrical conduction and reduces the electrical resistance of the second electrode, achieving homogeneous in-plane voltage and improved display consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode is made thinner to improve light transparency, then light transparency is improved, but electrical resistance increases
Solution Approach 1:
The second electrode system is segmented into two parts: the original thin second electrode and a newly added assisting conductive layer. The thin second electrode maintains light transparency, while the assisting conductive layer provides additional electrical conduction paths to compensate for the high resistance of the thin electrode.
Solution Approach 2:
The patent merges the second electrode and the assisting conductive layer into a composite conductive system. The assisting conductive layer is positioned adjacent to and electrically connected with the second electrode, creating a combined structure that achieves both optical transparency and electrical conductivity.
2Illumination intensity
If the second electrode is made thinner to improve light transparency, then light transparency is improved, but in-plane voltage uniformity deteriorates
Solution Approach 1:
The conductive function is segmented between the thin second electrode and the assisting conductive layer, allowing the thin electrode to focus on optical transparency while the assisting layer addresses voltage uniformity through its extended conductive network.
Solution Approach 2:
The assisting conductive layer is added in a new spatial dimension (adjacent to and parallel with the second electrode), creating additional conduction pathways that extend across the display area to ensure uniform voltage distribution without compromising the thin electrode's transparency.
3Illumination intensity
If the second electrode is made thinner to improve light transparency, then light transparency is improved, but display homogeneity deteriorates
Solution Approach 1:
The display performance is segmented into two independent functions: light transparency handled by the thin second electrode and voltage uniformity handled by the assisting conductive layer, allowing optimization of both aspects simultaneously.
Solution Approach 2:
The thin second electrode and assisting conductive layer are merged into a unified conductive system that delivers both optical and electrical performance, achieving homogeneous display output through the synergistic combination of transparency and voltage uniformity.
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
This solution reduces the electrical resistance of the second electrode, enhances in-plane voltage homogeneity, and alleviates issues of non-uniform panel brightness and mura, while also allowing for a thinner, more transparent second electrode, thus improving the overall display performance.
Implementation Method 1
the assisting conductive layer and the second electrode being in direct contact with and electrically connected to each other
Data Source
AI summary
An OLED display device includes an assisting conductive layer formed on a bottom surface of an upper substrate in such a way that the assisting conductive layer is in direct contact with and electrically connected to a second electrode that is located on a top surface of a lower substrate so that electrical conduction capability of the second electrode is enhanced and the electrical resistance of the second electrode is reduced to thereby make in-plane voltage homogenous, improve consistency of displaying, and alleviate the issues of non-uniform panel brightness and mura and also help reduce the thickness of the second electrode for saving material of the second electrode and increase light transparency of the second electrode.