Segmented OLED Pixel Layout With Protective Films for Light Extraction
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Solution Overview
Problem
Current display devices with organic electroluminescence (EL) elements face limitations in improving light extraction efficiency due to the wide radiation angle of light from the light emitting layer, which restricts the enhancement of light extraction efficiency.
Innovation Solution
The proposed light emitting device incorporates a pixel configuration with multiple subpixels, each containing multiple light emitting elements, where a first protective film transmits light and a second protective film guides light between adjacent elements, narrowing the width of light emitting elements to enhance light extraction efficiency without reducing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the width of light emitting elements is reduced to improve light extraction efficiency, then light extraction efficiency is improved, but the aperture ratio is reduced
Solution Approach 1:
The light emitting element is divided into multiple subpixels, each containing multiple light emitting elements. This segmentation allows the introduction of protective films between adjacent light emitting elements without reducing the overall aperture ratio, as the protective films are positioned in the spaces between segmented elements rather than occupying significant active area.
Solution Approach 2:
A protective film is introduced as an intermediary structure between adjacent light emitting elements. This protective film serves dual functions: it guides and confines light to improve extraction efficiency while being positioned in the interstitial spaces between elements, thus not significantly reducing the aperture ratio.
2Loss of energy
If the width of light emitting elements is reduced to confine and guide light, then light extraction efficiency is improved, but the device complexity increases
Solution Approach 1:
The pixel is segmented into multiple subpixels, and each subpixel contains multiple light emitting elements arranged in a systematic pattern. This segmentation creates a modular structure that, while more complex than a single element, follows a regular repeating pattern that simplifies manufacturing and control.
Solution Approach 2:
The protective film structure serves multiple functions: it protects the light emitting elements, guides light extraction, and defines the boundaries between adjacent elements. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
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 improves light extraction efficiency by confining and guiding light within the protective films, increasing the amount of light emitted upward while maintaining the aperture ratio, thus stabilizing the operation of the light emitting device.
Implementation Method 1
a second protective film constituting an interface for guiding the light immediately above the light emitting element is embedded between the light emitting elements adjacent
Data Source
AI summary
There is provided a light emitting device (10) including a plurality of pixels (20) arranged on a substrate, in which a pixel of the plurality of pixels includes a plurality of subpixels (100), at least one subpixel of the plurality of subpixels includes a plurality of light emitting elements (200), each light emitting element includes: a first electrode (202) provided on the substrate (300); a light emitting layer (204) that is laminated on the first electrode and emits light; a second electrode (206) that is laminated on the light emitting layer and transmits light from the light emitting layer; and a first protective film (208) that is laminated on the second electrode and transmits light from the light emitting layer, and a second protective film (210) constituting an interface for guiding the light immediately above the light emitting element is embedded between the light emitting elements adjacent.