Quantum Dot Display Bank Structure for Uniform Light Emission
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Solution Overview
Problem
Current display devices face challenges in achieving uniform light emission and enhanced luminance, particularly in the arrangement and configuration of light emitting elements and color conversion layers.
Innovation Solution
The display device incorporates light emitting elements on a base layer with a bank structure that includes protrusions and a cavity portion, where a color conversion layer with quantum dots is positioned adjacent to the bank, allowing for efficient light emission and conversion, and a color filter layer with light blocking layers to define distinct sub-pixel and emission areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If light emitting elements are arranged in a conventional manner, then the device structure is simple, but uniform light emission cannot be achieved
Solution Approach 1:
The bank structure is segmented into multiple protrusions arranged in a specific pattern, with each protrusion serving to define and organize light emitting elements in a controlled manner. This segmentation allows precise control over light emission uniformity while managing structural complexity through modular design
Solution Approach 2:
Different regions of the bank structure are designed with different properties - the protrusions have specific heights and spacing to control light emission in certain areas, while the cavity portion provides a different functional zone. This local differentiation enables uniform light emission across the display area by optimizing each region's contribution
2Illumination intensity
If luminance is enhanced by increasing light emitting element density, then brightness improves, but manufacturing precision requirements increase
Solution Approach 1:
The bank structure with its protrusions and cavity portions is formed in advance to create predetermined positioning features. These pre-formed structures guide the placement of light emitting elements, ensuring high-density arrangement with consistent spacing and alignment, thereby achieving enhanced luminance while maintaining manufacturability
Solution Approach 2:
The bank structure acts as an intermediary between the substrate and the light emitting elements, providing a structured platform that facilitates precise element placement. The protrusions serve as physical guides that mediate the positioning process, reducing the direct precision requirements for element placement while achieving high luminance through optimized density
3Ease of manufacture
If color conversion layer is positioned far from light emitting elements, then manufacturing is easier, but light conversion efficiency decreases
Solution Approach 1:
The color conversion layer is nested within the cavity portion of the bank structure, positioning it in close proximity to the light emitting elements. This nested arrangement maximizes the overlap between emitted light and the color conversion material, enhancing conversion efficiency while the cavity structure provides a defined space that facilitates controlled deposition processes
4Measurement precision
If sub-pixel areas are made larger to improve color coverage, then color accuracy improves, but emission area overlap increases
Solution Approach 1:
The protrusions are arranged in an asymmetric pattern that optimizes the distribution of sub-pixel areas. This asymmetric configuration allows each sub-pixel to achieve adequate color accuracy through appropriate sizing while the overall pattern minimizes overlap between adjacent sub-pixels, balancing color performance with emission area efficiency
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 ensures uniform light emission and improved luminance by optimizing the arrangement of light emitting elements and color conversion layers, enhancing the display's ability to produce full-color images with increased efficiency and reduced probability of defects.
Implementation Method 1
a color conversion layer on the light emitting elements in an area adjacent to the bank, the color conversion layer including quantum dots that convert a color of a light
Data Source
AI summary
A display device in accordance with an embodiment may include light emitting elements on a base layer; a bank on the base layer and protruding in a thickness direction of the base layer; and a color conversion layer on the light emitting elements in an area adjacent to the bank, the color conversion layer including quantum dots that convert a color of a light. The bank may include a main body and protrusions protruding from the main body toward the light emitting elements.