Horizontally Oriented Liquid Crystal OLED Emission
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Solution Overview
Problem
The existing OLED devices face limitations in brightness and power consumption due to randomly oriented emitting materials, which cause light to be emitted in all directions and result in refractive index differences leading to extinction of light within the device.
Innovation Solution
The OLED device incorporates a liquid crystal type emitting material that is horizontally oriented, with its transition dipole parallel to the electrodes, reducing light emission in side directions and improving electron and hole mobility, thereby increasing brightness and lowering the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If randomly arranged emitting materials are used in the emitting material layer, then the device structure is simple, but the emitting efficiency is limited and brightness is reduced
Solution Approach 1:
The patent changes the orientation parameter of the emitting materials from random arrangement to horizontally oriented arrangement. This parameter change causes the transition dipole to be parallel to the electrodes, directing light emission perpendicular to the surface, which significantly improves brightness and emitting efficiency without adding device complexity
Solution Approach 2:
The patent uses a composite material system consisting of liquid crystal type emitting materials combined with host materials. This composite structure enables both horizontal orientation control and efficient light emission, resolving the contradiction between simple structure and high brightness
2Use of energy by moving object
If randomly arranged emitting materials are used, then no additional orientation processes are needed, but light is emitted in all directions causing internal extinction and increased power consumption
Solution Approach 1:
The patent changes the orientation parameter of emitting materials to horizontal alignment, which directs light emission perpendicular to the electrode surfaces. This eliminates internal extinction caused by random emission directions, reduces power consumption, and maintains ease of manufacture through self-organization of liquid crystal materials
Solution Approach 2:
The liquid crystal type emitting materials automatically self-organize into horizontally oriented structures without requiring additional orientation processes. This self-service property maintains manufacturing simplicity while achieving the energy efficiency benefits of controlled light emission
3Productivity
If emitting materials are horizontally oriented with transition dipole parallel to electrodes, then light is emitted perpendicular to surface improving brightness, but requires specific material structure
Solution Approach 1:
The patent employs composite materials where liquid crystal type emitting materials are combined with host materials. This composite structure enables horizontal orientation and perpendicular light emission for high emitting efficiency, while the modular nature of the composite system keeps the overall device structure manageable
Solution Approach 2:
The patent changes the molecular structure parameter of emitting materials to include liquid crystal type structures with specific aromatic groups and substituents. This structural parameter change enables horizontal orientation and high emitting efficiency without excessively complicating the device architecture
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 horizontal orientation of the liquid crystal emitting materials enhances light emission perpendicular to the surface, increasing brightness and reducing the driving voltage of the OLED device, while also simplifying the fabrication process and reducing production costs.
Implementation Method 1
The OLED device emits light by injecting electrons from a cathode as an electron injection electrode and holes from an anode as a hole injection electrode into an emission compound layer, combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state
Implementation Method 2
the liquid crystal type emitting material has a liquid crystal phase in an operation temperature of the OLED device so that the liquid crystal type emitting material is horizontally oriented
Data Source
AI summary
An organic light emitting diode (OLED) device includes a first electrode; a second electrode facing the first electrode; an emitting material layer disposed between the first and second electrodes and a horizontally oriented liquid crystal type emitting material.