Flexible OLED Display with Merged Charge Auxiliary Layers
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Solution Overview
Problem
The existing manufacturing processes for organic light emitting diode displays require multiple deposition processes to increase the luminance of charge auxiliary layers, leading to increased complexity and cost.
Innovation Solution
A flexible organic light emitting diode display design that includes multiple light emitting elements on a flexible substrate, where the substrate is bent to position layers of light emitting elements to overlap, achieving a multi-layer organic emission layer without the need for multiple deposition processes, using materials like magnesium, silver, and indium tin oxide for electrodes and reflective layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple deposition processes are used to increase the luminance of charge auxiliary layers, then the luminance is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges multiple charge auxiliary layers (electron auxiliary layer and hole auxiliary layer) into a single integrated layer structure. This is achieved by forming both electron transporting and hole blocking functions within one layer using materials like Alq3 and BCP, eliminating the need for separate deposition processes for each auxiliary layer while maintaining the luminance enhancement effect
Solution Approach 2:
The charge auxiliary layer is designed to perform multiple functions simultaneously: electron transportation, hole blocking, and exciton confinement. By using materials with appropriate energy level alignments (such as Alq3 with LUMO=2.3eV and HOMO=6.0eV), a single layer can fulfill multiple roles that traditionally required separate layers, thereby reducing manufacturing complexity while improving luminance
2Illumination intensity
If multiple deposited charge auxiliary layers are used to increase luminance, then the luminance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple charge auxiliary layers into a single integrated layer, reducing the number of deposition steps required. This merging approach decreases material usage, reduces manufacturing time, and lowers overall production costs while still achieving the desired luminance enhancement through the multi-functional design of the single layer
3Illumination intensity
If multiple charge auxiliary layers are deposited to increase luminance, then the luminance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the electron auxiliary layer and hole auxiliary layer into a single charge auxiliary layer, reducing the number of deposition processes from multiple steps to a single step. This is achieved by using a material composition that provides both electron transporting and hole blocking capabilities within one layer, thereby simplifying the manufacturing process while maintaining luminance enhancement
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 design simplifies the manufacturing process and reduces costs while enhancing the luminance of the organic light emitting diode display by allowing multiple light emitting units to be disposed within the display without additional deposition processes, achieving increased luminance.
Implementation Method 1
the first electrode of the second light emitting element includes a reflective layer
Implementation Method 2
the first electrode of the first light emitting element includes a transparent layer or a semi-transparent layer
Implementation Method 3
excitons are generated by combining electrons provided from one of the two electrodes and holes provided from the other electrode at the emitting layer. Energy is output from the excitons when a ground state thereof is reached, to thereby emit light
Data Source
AI summary
An organic light emitting diode display includes: a flexible substrate configured to be bent at least once; a first display part on the flexible substrate and including a plurality of first light emitting elements; and a second display part on the flexible substrate and including a plurality of second light emitting elements. Each of a first light emitting element and a second light emitting element among the plurality of first and second light emitting elements includes a first electrode, an emission layer and a second electrode, the first electrode of the first light emitting element includes a transparent layer or a semi-transparent layer, the first electrode of the second light emitting element includes a reflective layer, and the second electrode of the first light emitting element and the second light emitting element, includes the transparent layer or the semi-transparent layer.