Conductive Organic Filling Material for OLED Reliability
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Solution Overview
Problem
Large-sized organic light-emitting displays face challenges with increased size and weight of sealing substrates, leading to reliability issues, and conventional filling materials can cause dark spots and pixel shrinkage due to outgassing.
Innovation Solution
Incorporating a conductive-organic small molecular filling material with electron withdrawing groups, such as cyano or fluorine, between the substrate and sealing substrate, which contacts the second electrode and has a thickness of 100 nm to 2000 nm, to enhance reliability and reduce voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filling material is used between the substrate and sealing substrate, then the space is filled and sealed, but dark spots and pixel shrinkage occur due to outgassing
Solution Approach 1:
The patent changes the material parameters by using a conductive organic small molecule with specific properties (lateral current leakage of 0.1-5.0 mA/cm², thickness of 100-2000 nm) instead of conventional filling materials. This material parameter change eliminates outgassing issues while maintaining display reliability.
Solution Approach 2:
The conductive organic small molecule acts as an intermediary material between the substrate and sealing substrate. It serves multiple functions: filling the space, preventing outgassing, and providing electrical conduction to reduce voltage drop, thereby resolving the contradiction between sealing effectiveness and display quality.
2Use of energy by moving object
If the thickness of the second electrode is reduced to lower driving voltage, then power consumption decreases, but voltage drop and reliability issues increase
Solution Approach 1:
The conductive organic small molecule filling material serves as an intermediary that compensates for the reduced electrode thickness. By providing lateral conduction (0.1-5.0 mA/cm²), it supports the thin electrode structure and prevents voltage drop, enabling both low driving voltage and high reliability.
Solution Approach 2:
The patent creates a composite structure where the thin second electrode (1-100 nm) works in conjunction with the conductive organic small molecule filling material. This composite system achieves both low driving voltage through the thin electrode and high reliability through the conductive filling material's lateral conduction.
3Reliability
If a sealing substrate is attached to the substrate with a sealing member, then the display is sealed and protected, but the size and weight increase for large-sized displays
Solution Approach 1:
The patent changes the filling material parameters to use a conductive organic small molecule with specific thickness (100-2000 nm) and conductivity properties. This material provides sealing support while being lightweight, reducing the overall weight compared to conventional filling materials while maintaining sealing reliability.
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 use of conductive-organic small molecules reduces lateral current leakage and prevents dark spots, maintaining panel reliability and lowering driving voltage even with thin electrodes, while minimizing thermal instability and outgassing.
Implementation Method 1
the filling material is a conductive-organic small molecule... the lateral current leakage of the conductive-organic small molecule may be in a range of about 0.1 to about 5.0 mA/cm2
Implementation Method 2
the conductive-organic small molecule may include an electron withdrawing group selected from a cyano group, a nitro group, a hydroxyl group, —F, —Cl, —Br, and —I
Data Source
AI summary
An organic light-emitting display including a conductive-organic small molecular filling material and methods of manufacturing the same are disclosed. The organic light-emitting display includes a substrate, a display unit disposed on the substrate, a sealing substrate disposed above the display unit, a sealing member that attaches the substrate to the sealing substrate and disposed outside the display unit; and a filling material filling a space between the substrate and the sealing substrate inwards from the sealing member, wherein the filling material is a conductive-organic small molecule.