Thin Film Encapsulation with Alternating Refractive Index Films for OLED Light Recycling
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in enhancing display quality due to limitations in light emission efficiency and encapsulation methods, which affect the intensity and color accuracy of the displayed images.
Innovation Solution
The integration of a quantum dot layer and a thin film encapsulation part with alternating inorganic and organic films, where the inorganic films are structured to reflect and recycle colored light, enhancing light emission intensity and color conversion, is implemented. This structure includes first and second inorganic films with different refractive indices, alternately stacked to maximize the intensity of reflected light within specific wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separate mirror layer is added to reflect colored light, then light emission intensity is improved, but device complexity increases
Solution Approach 1:
The patent combines the encapsulation function and the light reflection function into a single thin film encapsulation part. The alternating inorganic and organic films serve dual purposes: protecting the organic light emitting diode from environmental factors and reflecting colored light to enhance emission intensity, thereby eliminating the need for a separate mirror layer.
Solution Approach 2:
The thin film encapsulation part is designed to perform multiple functions simultaneously: it provides encapsulation protection against moisture and oxygen while also acting as a reflective structure for colored light. This multi-functionality reduces the overall device complexity by integrating what would traditionally require separate components.
2Illumination intensity
If alternating inorganic and organic films are used for encapsulation, then light reflection and color conversion are enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes changes in refractive index parameters between alternating inorganic and organic films to achieve constructive interference and enhance colored light reflection. By carefully controlling the thickness and material composition of each layer, the structure optimizes optical properties without requiring complex manufacturing processes.
3Manufacturing precision
If quantum dot layer is integrated with pixel layer, then color accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The quantum dot layer is integrated directly with the pixel layer structure, merging the light emission function of the OLED with the wavelength conversion function of the quantum dots. This integration achieves high color accuracy by enabling precise color tuning through quantum dot size control while maintaining a compact layered structure.
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 solution significantly improves the display quality by increasing the intensity of colored light used for imaging and simplifies the device structure by eliminating the need for a separate mirror layer, thereby enhancing the overall performance of the organic light emitting display device.
Implementation Method 1
The first inorganic film has a plurality of first auxiliary films, each having a first refractive index, and a plurality of second auxiliary films, each having a second refractive index that differs from the first refractive index. The plurality of second auxiliary films may be alternately stacked with the plurality of first auxiliary films in a thickness direction of the base substrate.
Implementation Method 2
The quantum dot layer includes quantum dots on the pixel layer
Implementation Method 3
The electrons and holes in the organic light emitting layer are recombined to generate excitons, and the energy generated due to the conversion of excitons from an excited state to a ground state causes light to be generated from the organic light emitting layer.
Data Source
AI summary
Provided is an organic light emitting display device including a base substrate, a pixel layer, a quantum dot layer, and a thin film encapsulation part. The pixel layer includes a plurality of organic light emitting diodes on the base substrate. The quantum dot layer includes quantum dots on the pixel layer. The thin film encapsulation part is between the quantum dot layer and the pixel layer, and seals the pixel layer. The thin film encapsulation part includes a first inorganic film and an organic film. The first inorganic film has a plurality of first auxiliary films, each having a first refractive index, and a plurality of second auxiliary films, each having a second refractive index that differs from the first refractive index, alternately stacked with the plurality of first auxiliary films along a thickness direction of the base substrate.