Spaced Color Conversion Layers for LED Display Luminance
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Solution Overview
Problem
Display devices using LEDs face challenges in achieving improved luminance and color gamut while minimizing light leakage and absorption losses in the color conversion layer.
Innovation Solution
A display device design featuring a substrate with sub-pixels and LEDs, where color conversion layers with multiple spaced-apart material layers are used to enhance color conversion efficiency and luminance, and transparent layers are interposed between these material layers to reduce light loss and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If color conversion material layers are stacked closely together, then color conversion efficiency is improved, but light absorption and loss increase
Solution Approach 1:
The color conversion layer is segmented into multiple color conversion material layers (first color conversion material layer, second color conversion material layer, third color conversion material layer) with transparent layers positioned between them. This segmentation allows light to pass through transparent layers, reducing absorption loss while maintaining color conversion efficiency through the distributed arrangement of conversion materials.
2Manufacturing precision
If color conversion material layers are made thicker, then color gamut is improved, but light leakage increases
Solution Approach 1:
The thick color conversion layer is divided into multiple thinner color conversion material layers separated by transparent layers. This segmentation achieves the desired color gamut through cumulative conversion while the transparent layers prevent excessive light absorption and reduce blue light leakage by allowing unconverted light to pass through to subsequent layers or escape.
Solution Approach 2:
The patent introduces a vertical dimension with multiple stacked layers at different heights. The first, second, and third color conversion material layers are positioned at different vertical levels with transparent layers in between, creating a three-dimensional structure that optimizes both color gamut and light extraction by distributing conversion function across multiple dimensions.
3Device complexity
If single-layer color conversion structure is used, then device complexity is reduced, but luminance decreases due to light loss
Solution Approach 1:
The color conversion layer is segmented into multiple color conversion material layers (first, second, and third layers) with transparent layers positioned between them. This segmentation allows light to pass through transparent layers, reducing absorption loss while maintaining color conversion efficiency through the distributed arrangement of conversion materials, thereby improving luminance.
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 design improves color gamut and luminance by optimizing the placement and thickness of color conversion material layers, reducing light absorption and leakage, and enhancing light extraction efficiency.
Implementation Method 1
a plurality of color conversion layers covering the plurality of LEDs. The plurality of color conversion layers each includes a plurality of color conversion material layers that are stacked to be spaced apart from each other
Data Source
AI summary
A display device according to an embodiment of the present disclosure includes a substrate on which a plurality of sub-pixels are defined, a plurality of LEDs disposed in each of the plurality of sub-pixels, and a plurality of color conversion layers covering the plurality of LEDs. The plurality of color conversion layers each include a plurality of color conversion material layers that are stacked to be spaced apart from each other. Accordingly, according to the present disclosure, it is possible to minimize or reduce light lost inside the color conversion layer by separating the plurality of color conversion material layers from each other, and improve color conversion efficiency and luminance.