OLED Encapsulation Layer with Integrated Quantum Dots
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Solution Overview
Problem
Conventional display apparatuses face challenges in encapsulation and color accuracy, with complex manufacturing processes and potential for color blurring or mixing due to the use of quantum-dot color conversion layers, which can be compromised by environmental exposure and require additional encapsulation or increased manufacturing costs.
Innovation Solution
The implementation of an encapsulation layer with alternately stacked inorganic and organic material layers, including quantum dots for color conversion, and a color filter layer to minimize color mixing and blurring, while providing enhanced environmental protection and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum-dot color conversion layers are used to achieve high color accuracy, then color conversion efficiency is improved, but the device becomes more susceptible to environmental damage and requires additional encapsulation
Solution Approach 1:
The patent combines the quantum-dot color conversion layer with the encapsulation layer into a single integrated structure. The quantum dots are embedded within the encapsulation layers, allowing the encapsulation layer to simultaneously perform both environmental protection and color conversion functions, eliminating the need for separate components
Solution Approach 2:
The encapsulation layer is designed to serve multiple functions: it provides environmental protection (sealing against moisture and oxygen) while simultaneously acting as the color conversion layer through embedded quantum dots. This multi-functional design reduces device complexity and improves reliability
2Reliability
If separate encapsulation and color conversion layers are used, then functional performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the encapsulation layer and color conversion layer into a single integrated layer structure. The quantum dots are incorporated within the encapsulation layers, reducing the total number of layers and simplifying the manufacturing process while maintaining both encapsulation and color conversion functions
3Productivity
If quantum dots are placed close to the OLED substrate for efficient color conversion, then color conversion efficiency is improved, but color blurring and mixing between adjacent pixels increase
Solution Approach 1:
The patent divides the quantum-dot-containing organic material layer into distinct regions corresponding to different color sub-pixels (red, green, blue). Each region contains quantum dots optimized for its specific color conversion function, with spatial separation between regions to prevent color mixing while maintaining efficient color conversion in each pixel
Solution Approach 2:
The patent applies different quantum dot compositions and configurations to different regions of the display. Each sub-pixel region has locally optimized quantum dots (e.g., specific sizes and materials) tailored to convert the OLED's blue light into the appropriate color, ensuring high color accuracy without cross-contamination
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 solution effectively suppresses color blurring and mixing, enhances encapsulation properties, and simplifies the manufacturing process by integrating color control elements within the organic material layer close to the OLED substrate, ensuring high color accuracy and robust environmental sealing.
Implementation Method 1
a first color control element including a first quantum dot with which a color of the emitted first light incident to the encapsulation layer is converted to a first color
Implementation Method 2
an encapsulation layer to which the emitted first light from the organic light-emitting device substrate is incident and from which a second light is emitted, the encapsulation layer including an inorganic material layer and an organic material layer alternately stacked with each other
Implementation Method 3
The organic material layer may further include a light-scattering element adjacent along the organic light-emitting device substrate to the plurality of color control elements. The light-scattering element may maintain the color of the emitted first light incident to the encapsulation layer
Data Source
AI summary
A display apparatus includes an organic light-emitting device (“OLED”) substrate which generates and emits a first light, and an encapsulation layer to which the emitted first light from the OLED substrate is incident and from which a second light is emitted. The encapsulation layer includes an inorganic material layer and an organic material layer alternately stacked with each other. The organic material layer includes a plurality of color control elements which color-convert the emitted first light incident to the encapsulation layer. The plurality of color control elements may include a first and second color control element including a first and second quantum dot with which a color of the emitted first light incident to the encapsulation layer is converted to a first and second color, respectively.