Organic Light Emitting Display Color Adjusting Layer
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Solution Overview
Problem
Existing organic light emitting displays lack the ability to easily adjust the color of light emitted, which limits their versatility and application in various devices.
Innovation Solution
Incorporating a color adjusting layer between the organic light emitting layers and the second electrode, composed of materials with high electron and hole transport capabilities, allows for the adjustment of the light emitting zone without altering the device's thickness, enabling easy color adjustment of emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color adjusting layer is added to enable color adjustment, then the adaptability of the display is improved, but the device complexity increases
Solution Approach 1:
A color adjusting layer is introduced as an intermediary component between the organic light emitting layer and the second electrode. This layer contains both electron-transporting materials and hole-transporting materials, acting as a mediator that enables color adjustment by controlling the recombination zone position without requiring fundamental changes to the device architecture.
Solution Approach 2:
The color adjusting layer serves multiple functions simultaneously: it acts as an electron-transporting layer, a hole-transporting layer, and a color adjustment mechanism all in one component. This multi-functionality reduces the need for separate dedicated layers for each function, thereby managing complexity while achieving color tunability.
2Adaptability or versatility
If the light emitting zone is adjusted by changing device structure, then the color adjustment capability is improved, but the manufacturing complexity increases
Solution Approach 1:
Color adjustment is achieved by changing the relative amounts or concentrations of electron-transporting materials and hole-transporting materials in the color adjusting layer, rather than by changing the physical structure or thickness of layers. This parameter-based adjustment simplifies manufacturing as it involves compositional control rather than structural reconfiguration.
Solution Approach 2:
The color adjusting layer is formed as a composite material containing both electron-transporting materials and hole-transporting materials in specific ratios. This composite approach allows color adjustment through material composition control, which is more easily manufactured than adjusting multiple separate layers or complex structural configurations.
3Adaptability or versatility
If multiple organic light emitting layers are used to emit different colors, then the color variety is improved, but the device complexity increases
Solution Approach 1:
Multiple light emitting functions are merged into a single organic light emitting layer by introducing a color adjusting layer that contains both electron- and hole-transporting materials. This combination allows different colors to be emitted from the same layer by controlling the recombination zone position, avoiding the need for multiple separate light emitting layers.
Solution Approach 2:
The color adjusting layer enables a single organic light emitting layer to perform multiple color emission functions by adjusting the relative amounts of electron- and hole-transporting materials. This universal approach allows one layer to replace what would traditionally require multiple specialized layers.
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 configuration enables easy adjustment of light color by modifying the amounts of electron and hole transport materials, facilitating the emission of desired colors without operational changes, enhancing the display's versatility and application range.
Implementation Method 1
holes and electrons are injected by a first electrode and a second electrode and the injected holes and electrons are combined with each other in a light emitting layer positioned between the first electrode and the second electrode to thereby generate light using energy generated when excitons formed due to the electron-hole combination drop from an exited state to a ground state
Implementation Method 2
a color adjusting layer positioned between the organic light emitting layer and the second electrode
Implementation Method 3
composed of materials with high electron and hole transport capabilities
Data Source
AI summary
Provided are organic light emitting display and manufacturing method of the organic light emitting display. According to an aspect of the present invention, there is provided a organic light emitting display comprising a substrate, a first electrode and a second electrode disposed on the substrate and opposed to each other, at least one organic light emitting layer positioned between the first electrode and the second electrode, and at least one color adjusting layer positioned between the organic light emitting layer and the second electrode.