Inkjet-Printed Color Conversion Regions for High-Resolution Displays
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Solution Overview
Problem
High-resolution display devices face challenges in forming color conversion layers and transmission layers using the inkjet printing method due to the reduction in planar sizes, making it difficult to maintain manufacturing efficiency and cost-effectiveness.
Innovation Solution
A display device design that includes color conversion regions and transmission layers formed by inkjet printing, with specific arrangements and dimensions of color pixels and conversion regions, allowing for equal distances and widths that facilitate the inkjet printing process, even at high pixel densities, and includes quantum dots in the conversion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the planar sizes of color conversion layers and transmission layers are reduced to increase resolution, then pixel density increases, but it becomes difficult to form these layers using the inkjet printing method
Solution Approach 1:
The pixel area is divided into multiple color pixel regions (first color pixel area, second color pixel area, third color pixel area) with distinct color conversion regions. Each color conversion region is further segmented into multiple color conversion layers that can be independently formed by inkjet printing. This segmentation allows each layer to be printed separately while maintaining overall high resolution.
Solution Approach 2:
The patent introduces a multi-layer vertical structure where color conversion layers are stacked in different heights. The first color conversion layer is formed at a first height, the second color conversion layer at a second height, and so on. This vertical dimensionality allows inkjet printing to form each layer sequentially without requiring extremely fine lateral resolution, thus resolving the contradiction between high pixel density and inkjet printing feasibility.
2Manufacturing precision
If more color conversion layers are added to improve color purity, then color quality increases, but manufacturing complexity increases
Solution Approach 1:
Multiple color conversion layers (first color conversion layer, second color conversion layer, third color conversion layer) are merged within the same color conversion region. Each layer contributes to the overall color purity while sharing the same spatial footprint. This merging approach increases color quality without proportionally increasing the lateral area or manufacturing steps, as layers are stacked vertically rather than spread horizontally.
Solution Approach 2:
Instead of adding color conversion layers horizontally which would increase area and complexity, the patent stacks layers vertically at different heights. The first color conversion layer is positioned at a first height, the second at a second height, and the third at a third height. This vertical stacking achieves high color purity while maintaining compact lateral dimensions and simplifying the manufacturing process by using sequential deposition.
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
Enables the manufacturing of high-resolution display devices with reduced manufacturing costs and simplified processes, while maintaining high pixel density and color purity, by optimizing the arrangement and dimensions of color conversion regions and transmission layers for inkjet printing.
Implementation Method 1
The first color conversion layer and the second color conversion layer may include quantum dots
Data Source
AI summary
A display device includes a pixel; and a first color conversion region, a second color conversion region, and a third color conversion region respectively overlapping a first color pixel, a second color pixel, and a third color pixel and spaced from each other. The third color conversion region is aligned with a region between the first color conversion region and the second color conversion region in a first direction, and the first color conversion region and the second color conversion region are aligned with each other in a second direction crossing the first direction. Part of the first color conversion region is disposed in a second pixel area that is adjacent to the first pixel area in the second direction, and part of the second color conversion region is positioned in a third pixel area that is adjacent to the first pixel area in the second direction.