OLED Display Organic Dot Light Extraction via Donor Substrate
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Solution Overview
Problem
OLED display devices suffer from low light emission efficiency due to significant light loss caused by total internal reflection in their multilayer stacked structure.
Innovation Solution
The implementation of an organic dot on a second electrode within the OLED display device, which has a refractive index different from the surrounding layers, disrupts the light path and prevents total internal reflection, combined with a donor substrate that forms the organic dot through selective light irradiation and heat conversion, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a multilayer stacked structure is used in OLED display device, then the device can be thin and light-weighted with lower power consumption, but light emission efficiency deteriorates due to total internal reflection
Solution Approach 1:
The patent introduces an organic dot layer that segments the continuous organic light emitting layer into discrete dots. This segmentation disrupts the total internal reflection paths and creates multiple light extraction interfaces, allowing more light to escape from the OLED structure while maintaining the multilayer stacked configuration.
Solution Approach 2:
The organic dots are strategically positioned at specific locations within the multilayer structure where light extraction is most beneficial. By creating local variations in refractive index and light path at these specific positions, the patent enhances light emission efficiency without altering the overall multilayer structure that enables low power consumption.
2Illumination intensity
If a multilayer stacked structure is used in OLED display device, then the device achieves higher luminance and response speed, but light emission efficiency deteriorates due to total internal reflection
Solution Approach 1:
The organic dot layer segments the light emitting layer into discrete emission points. This segmentation creates multiple light extraction interfaces that reduce total internal reflection, allowing a greater proportion of the generated light to escape externally, thereby improving light emission efficiency while preserving the high luminance capability of the multilayer structure.
Solution Approach 2:
The organic dots act as intermediary structures between the organic light emitting layer and the external environment. These dots provide additional light extraction pathways that mediate the transition from trapped light within the multilayer structure to externally emitted light, enhancing efficiency without compromising luminance.
3Loss of energy
If organic dot is added to OLED display device, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines the organic dot layer with the existing organic light emitting layer in a single manufacturing process. The organic dots are formed by selectively aggregating organic material from the same layer that provides light emission, merging the light-emitting function with the light-extraction enhancement function in one integrated structure rather than adding separate components.
Solution Approach 2:
The organic dots serve multiple functions simultaneously: they act as light-emitting centers like the continuous organic layer, while also serving as light extraction interfaces that reduce total internal reflection. This multi-functionality improves light emission efficiency without requiring additional separate structures, thereby limiting the increase in 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 approach significantly improves light emission efficiency by reducing light loss through internal reflection and scattering, leading to enhanced external light emission.
Implementation Method 1
a light-heat conversion layer disposed on the thermal insulating layer
Implementation Method 2
a thermal insulating layer disposed on the light blocking pattern layer
Implementation Method 3
a low surface tension layer disposed on the light-heat conversion layer. The low surface tension layer has a first surface tension lower that is than a second surface tension of the organic layer
Implementation Method 4
forming an organic agglomerate, from the organic layer, on the low surface tension layer by irradiating light to the donor substrate
Data Source
AI summary
An OLED display device including a first substrate, a first electrode disposed on the first substrate, an organic light emitting layer disposed on the first electrode, a second electrode disposed on the organic light emitting layer, and an organic dot disposed on the second electrode.