Quantum Dot Layer Color Conversion for Transparent OLED Displays
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Solution Overview
Problem
Existing organic light emitting diode (OLED) displays using colored polymer substrates face challenges in achieving transparency due to the yellow index and heat resistance limitations, making it difficult to realize a transparent OLED display while maintaining excellent mechanical and heat resistance characteristics.
Innovation Solution
Incorporating a quantum dot layer on the organic light emission display layer, which shifts the color of the substrate's wavelength range from 570 nm to 590 nm to a transparent range of 450 nm to 495 nm, using quantum dot particles made of Cd, Se, or S with diameters less than 2 nm, and a protection layer to safeguard the quantum dot layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a colored polymer substrate is used in OLED displays, then mechanical strength and heat resistance are improved, but transparency is worsened due to yellow index
Solution Approach 1:
The patent applies color conversion by placing a quantum dot layer on the colored polymer substrate. The quantum dots convert the yellow light (570-590 nm) emitted by the substrate to blue light (450-495 nm), effectively changing the color spectrum to achieve transparency while maintaining the mechanical and thermal benefits of the colored polymer substrate.
2Temperature
If a colored polymer substrate is used in OLED displays, then heat resistance is improved, but transparency is worsened due to yellow index
Solution Approach 1:
The patent uses quantum dot-based color conversion to transform the yellow wavelength range (570-590 nm) to blue wavelength range (450-495 nm). This allows the display to maintain the heat resistance properties of the colored polymer substrate while achieving transparency through spectral transformation.
3Object-affected harmful factors
If a quantum dot layer is added to shift color wavelength, then transparency is improved, but device complexity increases
Solution Approach 1:
The patent employs a composite structure combining the colored polymer substrate with a quantum dot layer. This composite approach enables the system to achieve transparency through wavelength conversion while maintaining the structural integrity and thermal properties of the original substrate, adding only a thin functional layer rather than completely redesigning the display 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
This approach enables the realization of a transparent OLED display with excellent heat resistance and mechanical characteristics, as the quantum dot layer effectively color-shifts the light to a transparent state without interfering with the image displayed, while the protection layer safeguards the quantum dots from external damage.
Implementation Method 1
a quantum dot layer on the organic light emission display layer, the substrate representing a color of a first wavelength range, and the quantum dot layer color-shifting the color of the first wavelength range to form a transparent light passing through the quantum dot layer
Data Source
AI summary
An organic light emitting diode display, including a substrate; an organic light emission display layer on the substrate; and a quantum dot layer on the organic light emission display layer, the substrate representing a color of a first wavelength range, and the quantum dot layer color-shifting the color of the first wavelength range to form a transparent light passing through the quantum dot layer.