Tandem OLED Microcavity Structure for Higher Light Extraction
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Solution Overview
Problem
Existing OLED devices face limitations in external quantum efficiency due to substrate, waveguide, and surface plasma mode losses, and the introduction of polarizers further reduces optical gain and efficiency.
Innovation Solution
A tandem OLED device with light-emitting units positioned at antinode points of a resonant microcavity and enhanced with a cholesteric liquid crystal layer and polarizer to optimize light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is introduced to control light polarization, then display quality is improved, but external quantum efficiency and optical gain are reduced
Solution Approach 1:
The patent extracts and removes the polarizer component from the OLED display structure. By eliminating this component that causes optical loss, the invention achieves higher external quantum efficiency while maintaining display quality through alternative means such as microcavity resonance and cholesteric liquid crystal layers.
Solution Approach 2:
The patent converts the harmful optical loss caused by traditional polarizers into beneficial effects by using cholesteric liquid crystal layers that can selectively reflect and transmit light based on wavelength and polarization, turning what was previously a loss mechanism into a light extraction enhancement mechanism.
2Ease of manufacture
If substrate, waveguide, and surface plasma mode losses occur, then device manufacturing is simplified, but external quantum efficiency is limited
Solution Approach 1:
The patent employs microcavity resonance, which is a form of optical vibration, to enhance light extraction. By designing the OLED structure as a resonant microcavity with specific cavity lengths, the invention creates constructive interference patterns that amplify light emission in desired directions, overcoming the limitations of substrate and waveguide modes without complicating the manufacturing process.
3Illumination intensity
If tandem OLED structure is used to increase brightness and efficiency, then luminous performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple light-emitting units into a single integrated OLED structure with shared electrodes and integrated light extraction mechanisms. This consolidation approach achieves high luminous brightness and efficiency comparable to tandem structures while reducing overall device complexity and simplifying manufacturing by eliminating the need for separate charge generation layers and multiple independent electrode 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
Significantly enhances electro-optical performance by improving light extraction and efficiency, achieving higher brightness and longer device life.
Implementation Method 1
a light-emitting center of the light-emitting unit is located at an antinode point of a resonance wave of a resonant microcavity formed between the first electrode and the second electrode
Implementation Method 2
a cholesteric liquid crystal layer is arranged on a side of the second electrode away from the first electrode
Data Source
AI summary
The present disclosure relates to the technical field of display, and provides a light-emitting device and a display panel. The light-emitting device comprises a first electrode, a second electrode, a plurality of light-emitting units arranged between the first electrode and the second electrode, and a charge separating generating unit arranged between adjacent light-emitting units, wherein a light-emitting center of the light-emitting unit is located at an antinode point of a resonance wave of a resonant microcavity formed between the first electrode and the second electrode.