OLED Microcavity Resonance and Non-Resonance Subpixel Segmentation
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Solution Overview
Problem
Organic light-emitting display apparatuses face issues with light efficiency and color purity due to internal total reflection, leading to decreased light extraction efficiency and color shift at side viewing angles, especially when using microcavity structures to enhance light efficiency.
Innovation Solution
The apparatus incorporates a combination of organic light-emitting devices with resonance and non-resonance structures, where one device has a reflective and semi-transmissive electrode configuration and the other has a reflective and transparent electrode configuration, allowing for independent driving and adjustment of light intensity and number of active devices based on the user's viewing angle to optimize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a microcavity resonance structure is applied to increase light efficiency, then light extraction efficiency is improved, but luminance deteriorates at side viewing angles and color shift occurs
Solution Approach 1:
The invention divides each pixel into multiple sub-pixels, where some sub-pixels employ microcavity resonance structures for high light extraction efficiency while other sub-pixels use non-resonance structures for wide viewing angle characteristics. This segmentation allows the system to combine the advantages of both structures and mitigate their respective disadvantages.
Solution Approach 2:
Different sub-pixels within the same pixel are assigned different structural qualities - some with resonance characteristics optimized for light extraction, others with non-resonance characteristics optimized for viewing angle. This local differentiation enables the overall pixel to achieve both high efficiency and wide viewing angle performance.
2Loss of energy
If a microcavity resonance structure is applied to increase light efficiency, then light extraction efficiency is improved, but color shift is generated
Solution Approach 1:
The invention segments the pixel structure into sub-pixels with different resonance characteristics. By combining sub-pixels with resonance structures (high extraction efficiency) and non-resonance structures (color stability), the overall system achieves both improved light extraction efficiency and maintained color stability across viewing angles.
Solution Approach 2:
The invention changes the structural parameters of different sub-pixels - specifically the presence or absence of microcavity resonance structures - to optimize the balance between light extraction efficiency and color stability. This parameter variation across sub-pixels allows the system to achieve superior overall performance.
3Illumination intensity
If light is emitted in arbitrary direction from the organic emission layer, then light emission coverage is improved, but light extraction efficiency decreases due to internal total reflection
Solution Approach 1:
The invention introduces microlens arrays as intermediary structures above the organic emission layer. These microlenses act as optical mediators that guide and extract photons that would otherwise be lost to internal total reflection, converting arbitrary-direction emission into directed light output and improving overall extraction efficiency.
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 approach balances light efficiency and viewing angle characteristics, minimizing luminance deterioration and color shift while ensuring optimal image display conditions for the user by dynamically adjusting the emission characteristics based on the viewer's position.
Implementation Method 1
The organic light emitting device is a self-emission type device that generates light when excitons transition from an excited state to a ground state. The excitons are generated when holes injected from the hole injection electrode and electrons injected from the electron injection electrode combine in the organic emission layer.
Implementation Method 2
one of the first pixel electrode and the first counter electrode is a reflective electrode and the other one is a semi-transmissive electrode
Implementation Method 3
an organic light-emitting display apparatus has been proposed that uses a microcavity structure
Implementation Method 4
one of the first pixel electrode and the first counter electrode is a reflective electrode and the other one is a semi-transmissive electrode
Data Source
AI summary
An organic light-emitting display apparatus includes a first light emitter having a resonance structure and a second light emitter having a non-resonance structure. The first light emitter and the second light emitter are to emit light of a same color. The resonance structure includes a reflective electrode and a semi-transmissive electrode. The non-resonance structure includes a reflective electrode and a transparent electrode. The first light emitter and the second light emitter are independently driven based on signals from different drivers.