Quantum Dot Color Conversion Layout for Blue-Light Display Efficiency
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Solution Overview
Problem
Existing display devices with light emitting elements and color conversion layers face challenges in achieving high light efficiency and display quality, particularly in converting lights with central wavelengths less than or equal to 450 nm effectively.
Innovation Solution
A display device configuration that includes multiple light emitting element groups with specific central wavelengths and a color conversion layer with distinct patterns for each group, utilizing quantum dots and scatterers to enhance light conversion efficiency and color matching rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion layer is used to convert light from light emitting elements, then display quality is improved, but light efficiency is reduced due to conversion losses
Solution Approach 1:
The color conversion layer is divided into multiple distinct color conversion patterns (first, second, and third patterns) positioned at different locations. Each pattern converts light from specific light emitting elements, allowing optimized light paths and reduced conversion losses for each color channel while maintaining overall display quality.
Solution Approach 2:
The patent introduces a light reflecting structure as an intermediary between the light emitting elements and the color conversion layer. This reflector redirects light that would otherwise be lost, directing it toward the color conversion patterns, thereby improving light efficiency without compromising the color conversion function.
2Illumination intensity
If light emitting elements with central wavelength less than or equal to 450 nm are used, then color gamut is expanded, but light conversion efficiency in the color conversion layer is reduced
Solution Approach 1:
The patent positions different types of light emitting elements at specific locations, with elements having central wavelength ≤450 nm placed where they can effectively contribute to color gamut expansion. The color conversion layer is configured with corresponding patterns that optimize conversion for each element type, ensuring high conversion efficiency is maintained despite the use of challenging wavelength ranges.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of light emitting elements and color conversion patterns. By controlling the vertical and lateral positions of elements with specific wavelengths and their corresponding conversion patterns, the system optimizes light extraction and conversion paths, maintaining efficiency even for elements with central wavelength ≤450 nm that are difficult to convert.
3Manufacturing precision
If multiple light emitting element groups with different central wavelengths are arranged, then color matching rate is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple light emitting element groups with different central wavelengths (including elements with wavelength ≤450 nm and elements with wavelength >450 nm) into a single integrated display structure. The color conversion layer integrates multiple conversion patterns that work together to achieve high color matching rate, simplifying the overall device architecture while maintaining precision.
Solution Approach 2:
The color conversion layer is designed with multi-functional patterns that can handle different wavelength ranges from various light emitting elements. The same color conversion layer structure serves multiple purposes: converting light from ≤450 nm elements, converting light from >450 nm elements, and maintaining color matching across the entire display, thereby reducing device complexity.
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 proposed configuration improves light conversion efficiency and color matching rate, achieving a light efficiency and display quality enhancement without compromising the color matching rate, with light conversion efficiencies of the color conversion patterns exceeding 30% and 35% respectively.
Implementation Method 1
a color conversion layer disposed on the first light emitting element group, the second light emitting element group, and the third light emitting element group and including a first color conversion pattern which converts a light emitted from the second light emitting element group
Implementation Method 2
a light transmission pattern which transmits a light emitted from the first light emitting element group
Implementation Method 3
the light transmission pattern may include a first scatterer, and each of the first color conversion pattern and the second color conversion pattern may include a quantum dot
Data Source
AI summary
A display device includes a first light emitting element group including at least one first light emitting element emitting a first light having a central wavelength greater than 450 nm and less than about 485 nm, a second light emitting element group including at least one second light emitting element emitting a second light having a central wavelength of about 450 nm or less, a third light emitting element group including at least one third light emitting element emitting a third light having a central wavelength of about 450 nm or less, and a color conversion layer disposed on the first, the second, and the third light emitting element group and including a first color conversion pattern which converts the second light emitted from the second light emitting element group and a second color conversion pattern which converts the third light emitted from the third light emitting element group.