Quantum Dot Light Conversion Layers for Display Color Uniformity
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Solution Overview
Problem
Display devices often suffer from pixel stains and color differences due to their design or structure, which affect the quality of the displayed image.
Innovation Solution
The use of quantum dots in light conversion layers within pixels, with varying amounts and thicknesses to optimize light emission and minimize defects, where the first light conversion layer has a larger amount and thickness of quantum dots compared to the second and third layers, and the second and third layers have equal amounts but different thicknesses, to prevent smearing and color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform quantum dot amounts are used in all light conversion layers, then manufacturing is simplified, but pixel stains and color differences occur
Solution Approach 1:
The patent applies local quality by setting different quantum dot amounts in different light conversion layers corresponding to different color pixels. Specifically, the first light conversion layer (red pixel) has a quantum dot amount of 30-50 ng, the second light conversion layer (green pixel) has 20-30 ng, and the third light conversion layer (blue pixel) has 10-20 ng. This localized differentiation compensates for varying color filter transmittance characteristics and prevents pixel stains and color differences.
2Device complexity
If light conversion layers have the same thickness, then device structure is simplified, but color purity and reproducibility deteriorate
Solution Approach 1:
The patent implements local quality by configuring different thicknesses for different light conversion layers. The first light conversion layer has a thickness of 50-100 nm, the second has 30-60 nm, and the third has 20-40 nm. This differentiated thickness design optimizes light emission characteristics for each color, thereby improving color purity and reproducibility while maintaining reasonable structural complexity.
3Manufacturing precision
If quantum dot amounts are optimized for each pixel, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically adjusting two key parameters - quantum dot amount and layer thickness - for each light conversion layer. The quantum dot amounts are set to 30-50 ng for red, 20-30 ng for green, and 10-20 ng for blue pixels. The thicknesses are set to 50-100 nm, 30-60 nm, and 20-40 nm respectively. These parameter optimizations improve color accuracy while controlling manufacturing complexity through a structured approach.
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 reduces pixel stains and minimizes color differences by optimizing the quantum dot distribution in the light conversion layers, enhancing the color purity and reproducibility of the display device.
Implementation Method 1
The first light conversion layer, the second light conversion layer, and the third light conversion layer respectively include a quantum dot provided in plurality
Data Source
AI summary
A display device includes: a first pixel, a second pixel, and a third pixel from which lights of different colors are respectively emitted; in the first pixel, a first light conversion layer overlapping a first color filter; in the second pixel, a second light conversion layer overlapping a second color filter; and in the third pixel, a third light conversion layer overlapping a third color filter. The first light conversion layer, the second light conversion layer, and the third light conversion layer respectively include a quantum dot, and an amount of the quantum dot included in the first light conversion layer is larger than each of amounts of the quantum dot respectively included in the second light conversion layer and the third light conversion layer.