Electroluminescent Device Window Light Transmittance
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Solution Overview
Problem
Existing electroluminescent devices face challenges in efficiently integrating a light transmitting region within the emission area, which affects the device's performance and reliability.
Innovation Solution
The proposed electroluminescent device incorporates a lower structure with a light transmitting region surrounded by the emission area, along with an encapsulation structure that includes an inorganic lower surface making contact with the outer inorganic surface portions, while avoiding contact with the opened outer inorganic surface portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light transmitting region is integrated within the emission area, then light transmittance is improved, but device complexity increases
Solution Approach 1:
The emission area is segmented into multiple regions: a light emitting region and a light transmitting region. This segmentation allows different functional zones within the same emission area, enabling light to pass through the transparent region while maintaining emission functionality in other areas, thus improving overall light transmittance without compromising device performance
Solution Approach 2:
The emission area serves multiple functions: it can emit light in certain regions and transmit light in other regions. This multi-functionality allows the same structural area to perform both emission and transmission roles, reducing the need for additional separate components and thereby managing device complexity
2Reliability
If encapsulation structure contacts outer inorganic surface portions, then moisture and oxygen permeation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The encapsulation structure is designed to contact only specific outer inorganic surface portions rather than the entire surface. This localized contact approach provides effective moisture and oxygen barrier protection at critical interfaces while reducing the stringency of manufacturing precision requirements across the whole device structure
3Illumination intensity
If light transmitting region is surrounded by emission area, then light transmittance is improved, but area utilization decreases
Solution Approach 1:
The light transmitting region is merged with the emission area such that the transparent region is surrounded by and integrated into the emission area. This merging allows the emission area to serve dual purposes: emitting light in its functional zones and framing/providing structural support for the light transmitting region, thereby improving light transmittance while maintaining effective area utilization
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 enhances the device's light transmittance and reduces moisture and oxygen permeation, leading to improved performance and reliability of the electroluminescent device.
Implementation Method 1
an encapsulation structure that is located on the lower structure... The encapsulation structure may include an inorganic lower surface that makes a contact with an entire of the outer inorganic surface portion... reduces moisture and oxygen permeation
Implementation Method 2
The window a light transmitting region or a notch... This configuration enhances the device's light transmittance
Data Source
AI summary
In non-limiting example embodiments, an electroluminescent device may include a lower structure including an emission area, and an encapsulation structure located on the lower structure. The lower structure may include a window. The window may be a light transmitting region or a notch. The light transmitting region may be spaced apart from the emission area and completely or partially surrounded by the emission area in a plan view. The notch may be formed at one side of the lower structure and recessed inward in a plan view such that one side of the emission area substantially conforms to the notch.