Light-Emitting Element Above Color Filter for Front Extraction
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Solution Overview
Problem
Existing light emission devices face challenges in improving front light extraction efficiency due to difficulties in forming light emission layers with variable thickness and increased manufacturing steps, particularly in structures with lens members between reflection and transparent electrode layers.
Innovation Solution
A light emission element with a recessed or dome-shaped portion, a first electrode layer, an organic layer, a second electrode layer, and a planarization layer, where light is emitted through the second electrode and planarization layer, enhancing front light extraction efficiency without significant manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light emission layer with variable thickness is formed to function as an optical lens, then front light extraction efficiency is improved, but manufacturing difficulty increases significantly
Solution Approach 1:
The device is divided into distinct functional layers: a standard uniform thickness light emission layer, a separate microlens layer, and a color filter layer. This segmentation allows the light emission layer to maintain constant thickness for easy manufacturing while the microlens layer provides the optical focusing function to improve front light extraction efficiency.
Solution Approach 2:
The optical lens function is extracted from the light emission layer and implemented as a separate microlens layer. This extraction allows the light emission layer to be formed with uniform thickness using standard manufacturing processes, while the microlens layer provides the variable thickness optical function needed for improved light extraction.
2Illumination intensity
If a lens member is arranged between the reflection layer and transparent electrode layer, then front light extraction efficiency is improved, but manufacturing steps increase
Solution Approach 1:
The microlens layer is combined with the color filter layer in a single integrated structure. This merging reduces the total number of manufacturing steps by eliminating separate processing for individual layers while maintaining the optical functions of both the microlens and color filter.
Solution Approach 2:
The microlens layer serves multiple functions: it acts as an optical lens for light extraction enhancement, provides structural support, and works in conjunction with the color filter layer for color selection. This multi-functionality reduces the need for additional specialized components and manufacturing steps.
3Volume of moving object
If position adjustment between the organic layer and on-chip microlens is required for miniaturization, then device size is reduced, but alignment difficulty increases
Solution Approach 1:
The microlens layer and color filter layer are formed simultaneously in the same manufacturing step, ensuring automatic alignment between these layers. This preliminary action of creating both layers together eliminates the need for subsequent alignment operations, maintaining manufacturing precision while enabling device miniaturization.
Solution Approach 2:
The color filter layer acts as an intermediary between the light emission layer and the microlens layer, providing a common reference plane that facilitates precise alignment. By forming both the microlens and color filter together, the system uses this intermediary layer to maintain positional accuracy during miniaturization.
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 proposed structure improves front light extraction efficiency by reflecting and emitting light through the organic and second electrode layers, reduces manufacturing steps, and minimizes viewing angle-dependent luminance changes, while allowing for a resonator structure formation.
Implementation Method 1
a light emission layer configured to emit light by electroluminescence
Implementation Method 2
light from the organic layer is emitted to the outside via the second electrode layer and the planarization layer
Data Source
AI summary
In one example, a light emitting device comprises a substrate, a color filter disposed above the substrate, and a light emitting element disposed above the color filter. The light emitting element includes a first electrode, an organic layer and a second electrode. The first electrode has a recessed shape or a domed shape in a cross-sectional view, and the second electrode is disposed between the color filter and the first electrode. The light emitting element is configured to emit a light towards the substrate. A first layer is disposed between the light emitting element and the substrate, an upper surface of the first layer having the recessed shape or the domed shape in the cross-sectional view.