Nano-Stack Encapsulation for QD-OLED Light Reflection
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Solution Overview
Problem
Conventional quantum dot light-emitting diode display panels suffer from low light output efficiency, low brightness, and poor contrast in a dark state due to scattering of quantum dot materials and the influence of ambient light.
Innovation Solution
The display panel incorporates a light-emitting substrate with an encapsulation layer featuring a nano-stack structure of inorganic and organic layers to reflect red and green light, and a buffer layer with a similar nano-stack structure to reflect blue light, enhancing light utilization efficiency and reducing ambient light influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dot light-emitting diode display panel uses conventional structure without nano-stack layers, then the structure is simple and easy to manufacture, but the light output efficiency is low and brightness is reduced
Solution Approach 1:
The patent applies composite materials by stacking inorganic layers (such as SiO2, Si3N4, TiO2) and organic layers (such as PMMA, PC) to form nano-stack structures. This composite structure enables effective reflection of specific wavelengths of light while maintaining manufacturing feasibility through established thin-film deposition techniques.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the thickness of each layer in the nano-stack structure and selecting materials with specific refractive indices. By adjusting these parameters, the structure reflects specific wavelengths (red/green light from color filter substrate, blue light from light-emitting substrate) to improve light output efficiency.
2Device complexity
If quantum dot light-emitting diode display panel uses conventional structure, then the device complexity is low, but the brightness and light utilization efficiency are insufficient
Solution Approach 1:
The patent transitions from a conventional single-layer or simple multi-layer structure to a nano-stack structure with multiple alternating inorganic and organic layers. This dimensional complexity in the vertical stacking arrangement enables selective wavelength reflection, thereby enhancing brightness and light utilization efficiency.
3Ease of manufacture
If quantum dot light-emitting diode display panel uses conventional structure, then the manufacturing process is simple, but the contrast in dark state is poor due to ambient light influence
Solution Approach 1:
The patent converts the harmful effect of ambient light and scattered light into a beneficial effect by using the nano-stack structure to reflect specific wavelengths. The inorganic/organic layer stack reflects red and green light from the color filter substrate and blue light from the light-emitting substrate, thereby improving contrast in dark state while maintaining manufacturing simplicity.
4Productivity
If quantum dot light-emitting diode display panel incorporates nano-stack layers for light reflection, then light output efficiency and brightness are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the encapsulation layer and buffer layer into multiple discrete inorganic and organic sub-layers, each with specific thickness and material properties. This segmentation allows independent optimization of each layer's reflective properties for different wavelengths, improving light output efficiency while managing complexity through modular design.
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 output efficiency, increases brightness, and enhances contrast in a dark state by reducing light loss and utilizing blue light more effectively, addressing the limitations of conventional quantum dot light-emitting diode display panels.
Implementation Method 1
the first nano-stack layer comprises a first inorganic layer and a first organic layer disposed in a stack arrangement, and the first organic layer has a refractive index less than a refractive index of the first inorganic layer
Implementation Method 2
the first organic layer has a refractive index less than a refractive index of the first inorganic layer
Implementation Method 3
the second nano-stack layer comprises a second inorganic layer and a second organic layer disposed in a stack arrangement, and the second organic layer has a refractive index less than a refractive index of the second inorganic layer
Implementation Method 4
the second organic layer has a refractive index less than a refractive index of the second inorganic layer
Implementation Method 5
QD-OLED technology uses electroluminescent diodes to generate blue light to excite red/green quantum dots to form a full-color display
Data Source
AI summary
A display panel includes a light-emitting substrate, an encapsulation layer, and a color filter substrate. The encapsulation layer includes at least a first nano-stack layer for reflecting light emitted from the color filter substrate. The first nano-stack layer includes a first inorganic layer and a first organic layer disposed in a stack arrangement, and the first organic layer having a refractive index less than a refractive index of the first inorganic layer. By using at least one first nano-stack provided in the encapsulation layer to reflect red and/or green light emitted from the color filter substrate, the present invention can reduce light loss of the red light quantum dot conversion unit and the green light quantum dot conversion unit due to scattering, and improve light output efficiency.