OLED Hole Injection Layer Dipole Material for Response Speed
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Solution Overview
Problem
Liquid crystal displays (LCDs) have limitations such as requiring a separate backlight, limited response speed, and restricted viewing angle, which are not addressed by existing technologies.
Innovation Solution
An organic light emitting diode (OLED) structure is developed, featuring a first and second electrode with an emission layer and a hole injection layer containing a dipole material with components of different polarities, along with an electron injection layer, hole transfer layer, and electron transfer layer, optimized for improved efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a liquid crystal display is used, then the device can be manufactured with existing technology, but it requires a separate backlight and has limited response speed and viewing angle
Solution Approach 1:
The patent extracts the backlight unit from the display structure, replacing it with self-emissive OLED layers. This eliminates the need for separate backlight components while achieving faster response speeds and wider viewing angles through organic electroluminescent materials
Solution Approach 2:
The patent employs composite organic materials including hole injection layers, hole transport layers, emission layers, and electron transport layers with specific molecular structures. These composite material systems enable self-emission with rapid response characteristics and wide viewing angles without requiring LCD's complex backlight structure
2Length of stationary object
If a liquid crystal display is used, then the device can be manufactured with existing technology, but it requires additional backlight components increasing device thickness
Solution Approach 1:
The patent removes the backlight unit, polarizing filters, and other bulky components characteristic of LCD structures. The OLED structure achieves light emission through thin organic layers deposited on electrodes, dramatically reducing overall device thickness while simplifying the manufacturing process
Solution Approach 2:
The patent utilizes thin-film organic materials deposited in vacuum or solution processes to create the emission structure. These thin films replace the thick liquid crystal panels and backlight assemblies of LCDs, enabling ultra-thin display devices with simplified manufacturing
3Adaptability or versatility
If a liquid crystal display is used, then the device structure is established, but it has restricted viewing angle
Solution Approach 1:
The patent extracts the polarizing filters and liquid crystal molecules that limit viewing angles in LCDs. The OLED structure emits light directly from organic electroluminescent layers, providing wide viewing angles without requiring complex optical compensation structures
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 OLED achieves enhanced emission efficiency, rapid response, and a wide viewing angle, making it a superior alternative to traditional LCDs with self-emitting capabilities.
Implementation Method 1
a hole injection layer between the first electrode and the emission layer, the hole injection layer including a dipole material including a first component and a second component that have different polarities
Implementation Method 2
The first component may be a metal or non-metal having a work function of 4.0 eV or more
Implementation Method 3
an emission layer between the first electrode and the second electrode
Data Source
AI summary
An organic light emitting diode, including a first electrode and a second electrode facing each other; an emission layer between the first electrode and the second electrode; and a hole injection layer between the first electrode and the emission layer, the hole injection layer including a dipole material including a first component and a second component that have different polarities.