Quantum Dot Sub Light Control Layer for Display Efficiency
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Solution Overview
Problem
Existing display devices with quantum dots face challenges in achieving high light efficiency and color gamut due to the presence of multiple layers that reduce light emission efficiency, particularly the need for a filling layer that deteriorates light efficiency.
Innovation Solution
A display device design that includes a sub light control layer with quantum dots adjacent to the light-emitting layer, eliminating the need for a filling layer and incorporating a light control layer with quantum dots, along with a capping layer and color filter, to enhance light output and color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a filling layer is included in the display device structure, then the structural integrity is maintained, but the light efficiency deteriorates
Solution Approach 1:
The patent removes the filling layer from the display device structure entirely. By extracting this unnecessary component, the patent eliminates the light absorption and scattering that occurred within the filling layer, thereby improving light efficiency while simplifying the overall device structure.
Solution Approach 2:
The patent repositions the sub light control layer from a planar configuration to a three-dimensional structure extending in the thickness direction. This dimensional change allows the light control functionality to be achieved without requiring a separate filling layer, as the extended sub light control layer itself provides the necessary structural support and light management.
2Illumination intensity
If multiple layers are used to control light emission, then color gamut is improved, but light emission efficiency decreases
Solution Approach 1:
The patent merges the light control functionality into the sub light control layer itself, which is already an existing component in the device stack. By combining the light emission control and light transmission functions within this single layer, the patent reduces the total number of separate layers needed while maintaining color gamut performance.
Solution Approach 2:
The patent divides the light control function into distinct regions within the sub light control layer, creating first, second, and third sub light control parts with different quantum dot compositions. This segmentation allows each region to optimize for specific color wavelengths while maintaining overall light efficiency, avoiding the need for separate dedicated layers for each function.
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 efficiency and color gamut by reducing the light emission path and optimizing color filtering, resulting in enhanced display performance without the filling layer.
Implementation Method 1
Each of the sub light control layer and the light control layer may include quantum dots
Data Source
AI summary
A display device according to an embodiment includes a circuit layer, a light-emitting element layer, an inorganic encapsulation film, a sub light control layer, a light control layer, a capping layer, and a color filter layer which are sequentially stacked each other. The sub light control layer includes a first to third sub light control parts, and a light control layer includes a bank and a first to third light control parts spaced apart from each other with the bank therebetween. Each of the sub light control layer and the light control layer includes quantum dots. The display device according to an embodiment includes the sub light control layer adj acent to the light-emitting element layer to exhibit improved light efficiency and color gamut.