Display Device Quantum Dot Color Gamut Efficiency
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Solution Overview
Problem
Conventional display devices face challenges in simultaneously achieving a wide color gamut and high extraction efficiency due to difficulties in excluding intermediate color wavelengths, which affects color reproducibility and brightness.
Innovation Solution
A display device comprising a light source, a color conversion layer with quantum dots that emit red light, and a color filter with blue, green, and red filters, where specific conditions regarding the proportion of non-overlapping regions in the spectrum curves and light transmittance are met to optimize the color gamut and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional color conversion layers and color filters are used, then device complexity is reduced, but color gamut and extraction efficiency cannot be simultaneously optimized
Solution Approach 1:
The patent applies parameter changes by precisely controlling the emission spectrum characteristics of quantum dots and the transmittance spectrum of color filters. Specific parameters include wavelength ranges (440-460nm for blue, 520-540nm for green, 620-650nm for red), full width at half maximum values (20-80nm), and transmittance ratios (βb+βg+βr ≥ 63.0). By optimizing these parameters, the patent achieves high extraction efficiency while maintaining manageable device complexity through standardized spectral characteristics.
Solution Approach 2:
The patent uses composite materials by combining quantum dots with specific color filters in a color conversion layer. The quantum dots emit light at specific wavelengths (blue, green, red) and are combined with color filters that have corresponding transmittance characteristics. This composite structure enables simultaneous optimization of color gamut and extraction efficiency by leveraging the complementary properties of both materials.
2Manufacturing precision
If intermediate color wavelengths are excluded to improve color gamut, then color reproducibility improves, but brightness and extraction efficiency deteriorate
Solution Approach 1:
The patent applies local quality by optimizing the spectral characteristics at specific wavelength regions. Each color filter (blue, green, red) is designed with specific transmittance ranges centered on primary colors, allowing precise control over which wavelengths are transmitted. This localized optimization enables high color reproducibility in each channel while maintaining overall brightness through the cumulative effect of all three color filters working together.
Solution Approach 2:
The patent applies partial action by selectively transmitting only the necessary wavelength ranges for each color filter, rather than transmitting all wavelengths. The color filters are designed with specific transmittance characteristics (βb+βg+βr ≥ 63.0) that allow partial transmission of intermediate wavelengths when beneficial, while excluding wavelengths that would degrade color purity. This partial action approach balances color reproducibility with brightness preservation.
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 enables both a wide color gamut and high extraction efficiency by carefully managing the spectrum curves and light transmittance, improving color reproducibility and brightness by effectively excluding intermediate color wavelengths.
Implementation Method 1
a color conversion layer (B); wherein the color conversion layer (B) contains quantum dots (B-r) that emit red light
Implementation Method 2
a color filter (C), wherein the color filter (C) has a blue color filter (C-b), a green color filter (C-g), and a red color filter (C-r)
Data Source
AI summary
A display device including a light source (A), a color conversion layer (B), and a color filter (C), wherein the color conversion layer (B) contains quantum dots (B-r) that emit red light, the color filter (C) has a blue color filter (C-b), a green color filter (C-g), and a red color filter (C-r), and the display device satisfies α≤1.80 and (II) β≥63.0.