Quantum Dot Migrating Layer for High Pixel Density Displays
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Solution Overview
Problem
Existing quantum dot electroluminescent devices face challenges in achieving high pixel density due to the need for separate quantum dot layers for red, green, and blue light emission, which limits the compactness and efficiency of display apparatuses.
Innovation Solution
A light-emitting device with a quantum migrating layer that encapsulates transparent charged particles and quantum dots, allowing for selective light emission by controlling the migration of quantum dots between light-exiting and non-light-exiting regions, enabling a single sub-pixel to emit at least two colors, thereby improving pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate quantum dot layers for red, green, and blue light emission are used, then color display capability is achieved, but device complexity and pixel density are limited
Solution Approach 1:
The patent combines multiple quantum dot layers (red, green, blue) into a single integrated quantum dot migrating layer. This layer contains all three quantum dot types that can migrate to different sub-regions within the same layer, eliminating the need for separate stacked layers and reducing overall device complexity while maintaining full color display capability.
Solution Approach 2:
The quantum dot migrating layer serves multiple functions simultaneously: it contains red, green, and blue quantum dots that can each be independently controlled to emit their respective colors. The single layer structure performs the work of multiple separate layers, enabling color display while simplifying the device architecture.
2Adaptability or versatility
If separate quantum dot layers for red, green, and blue light emission are used, then color display capability is achieved, but pixel density is limited
Solution Approach 1:
By merging red, green, and blue quantum dots into a single migrating layer, the patent reduces the vertical space required for color display structures. This allows for higher pixel density as fewer discrete layers need to be stacked, enabling more pixels to be packed into the same area while maintaining full color capability.
3Ease of manufacture
If quantum dots are confined to fixed positions, then manufacturing simplicity is maintained, but light emission efficiency and color selectivity are reduced
Solution Approach 1:
The patent introduces dynamic mobility to quantum dots within the migrating layer through application of electric fields. Quantum dots can move from a relaxed state to an activated state, allowing them to migrate to specific sub-regions for light emission. This dynamic control enables efficient light emission and color selectivity while maintaining relative manufacturing simplicity compared to fixed multi-layer structures.
4Device complexity
If a single quantum dot layer is used for multiple colors, then device complexity is reduced, but control precision over color emission is worsened
Solution Approach 1:
The patent segments the quantum dot migrating layer into multiple sub-regions (red sub-region, green sub-region, blue sub-region) within the single layer. By applying electric fields, quantum dots can be precisely controlled to migrate to their respective target sub-regions, enabling accurate color emission control. This segmentation approach maintains the simplicity of a single layer structure while achieving precise color control through spatial separation of emission zones.
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 the utilization of each sub-pixel, increasing pixel density and resolution by allowing a single sub-pixel to selectively emit two colors, improving the compactness and efficiency of the display apparatus.
Implementation Method 1
a quantum dot is a semiconductor in nanoscale. This nano-semiconductor material would emit light at a specific frequency by applying a specific light pressure thereto
Implementation Method 2
transparent charged particles and quantum dots, which can migrate in the light-exiting region and the non-light-exiting region
Data Source
AI summary
Provided are a light-emitting device and a display apparatus. The light-emitting device includes: sub-pixels located on an array substrate, the sub-pixels each includes a first electrode and a second electrode that are disposed opposite to each other, and a quantum migrating layer between the first electrode and the second electrode. The quantum migrating layer includes a non-light-exiting region and a light-exiting region corresponding to a backlight source. Transparent charged particles and quantum dots, which can be driven by an electric field to migrate in the light-exiting region and the non-light-exiting region, are encapsulated in an accommodating cavity of the quantum migrating layer. When there are quantum dots gathered in the light-exiting region, the quantum dots are excited to emit light; when there is no quantum dot in the light-exiting region, the light emitted by the backlight source directly passes and exits through the light-exiting region.