Quantum Dot Light Control Layer for Green Display Efficiency
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Solution Overview
Problem
Existing display devices face challenges in enhancing power conversion efficiency and light transmission efficiency, particularly for green light, in their light control units, which utilize quantum dots.
Innovation Solution
A display device incorporating a light-emitting element with green and blue light-emitting structures and a light control layer containing green quantum dots made of AgInXGa1−XS2, where 0.05≤X<1, to convert and emit green light with a power conversion efficiency less than 32%, and a light control panel with separate units for red, green, and blue light-emitting regions to optimize wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If quantum dots are used in light control units to convert wavelength, then color quality is improved, but power conversion efficiency is insufficient (less than 32% for green light)
Solution Approach 1:
The patent changes the compositional parameters of the quantum dot material by using AgInXGa1−XS2 where 0.05≤X<1, and controls the particle size within 2-20 nm. This parameter optimization enables the quantum dot to achieve higher power conversion efficiency while maintaining the desired green light emission characteristics.
Solution Approach 2:
The patent employs composite quantum dot materials combining multiple elements (Ag, In, Ga, S) in specific ratios to create AgInXGa1−XS2 quantum dots. This composite approach allows optimization of both optical properties and conversion efficiency by leveraging the synergistic effects of different materials.
2Manufacturing precision
If light control layer is added to convert wavelength, then color accuracy is enhanced, but light transmission efficiency is reduced
Solution Approach 1:
The patent optimizes the thickness and compositional parameters of the light control layer to minimize light absorption while maximizing wavelength conversion. By controlling the quantum dot size and concentration, the layer achieves high color accuracy with minimal light loss.
Solution Approach 2:
The patent applies different light control units with specific quantum dot compositions to different regions (red, green, blue) to optimize local wavelength conversion efficiency. Each region receives tailored treatment to maximize its specific wavelength conversion while maintaining overall light transmission.
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 enhances light extraction efficiency and power conversion efficiency for green light, improving the overall display quality by optimizing the use of quantum dots in the light control layer.
Implementation Method 1
a green light control unit including a green quantum dot that converts the wavelength of light emitted from the light-emitting element and emits green light
Data Source
AI summary
A display device is disclosed. The display device may include a light-emitting element that outputs source light and a light control layer on the light-emitting element, which transmits the source light or converts the wavelength of the source light. The light-emitting element may include a first electrode, a second electrode facing (e.g., opposite to) the first electrode, at least one green light-emitting structure between the first electrode and the second electrode, and at least one blue light-emitting structure between the first electrode and the second electrode. The light control layer may include a green light control part including a green quantum dot that converts the wavelength of light emitted from the light-emitting element and emits green light. The power conversion efficiency of the green light control part may be less than about 32%, thereby being able to exhibit or provide excellent or suitable light efficiency and relatively high luminance characteristics.