Backlight Assembly Quantum Dot Wavelength Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight assemblies for display devices face challenges in achieving high color purity and uniformity of light emission, particularly due to limitations in the wavelength conversion efficiency of phosphor materials used in liquid crystal displays.
Innovation Solution
Incorporating quantum dots as wavelength conversion layers between substrates in a backlight assembly, where the quantum dots are strategically positioned in recess patterns on the substrates to enhance light emission efficiency and color uniformity, with the layers converting the wavelength of light emitted from blue light sources into white light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional phosphor materials are used for wavelength conversion, then the structure is simple, but the color purity and luminance are insufficient
Solution Approach 1:
The wavelength conversion member is segmented into multiple functional layers: a first substrate, multiple wavelength conversion layers (each corresponding to different light sources), a second substrate, and support structures. This segmentation allows each layer to be optimized for specific wavelength conversion tasks, improving color purity and luminance while maintaining manageable complexity through modular design
Solution Approach 2:
The patent employs composite material structures by combining quantum dots with phosphor materials in specific layers, and integrating multiple wavelength conversion layers with different materials (yellow phosphor, red phosphor, green phosphor) to achieve superior optical performance that cannot be obtained with single materials
2Illumination intensity
If quantum dots are integrally disposed on the light source portion, then color purity increases, but manufacturing precision requirements increase
Solution Approach 1:
Instead of integrally disposing quantum dots across the entire light source portion, the patent segments them into discrete wavelength conversion layers, with each layer containing quantum dots positioned to correspond to specific light sources. This segmentation reduces the positioning precision required for each individual layer while maintaining overall color purity
Solution Approach 2:
The patent introduces intermediary structures (first substrate, second substrate, and support members) that facilitate the positioning of quantum dots. These intermediaries act as mediators that simplify the manufacturing process by providing structured platforms for quantum dot placement, reducing the direct precision requirements
3Illumination intensity
If multiple wavelength conversion layers are used, then uniformity of light emission improves, but device complexity increases
Solution Approach 1:
The wavelength conversion function is segmented into multiple layers, with each layer dedicated to converting wavelengths from specific light sources. This segmentation ensures uniform light emission by distributing the conversion function across layers, with each layer optimized for its specific task, preventing hotspots and ensuring even illumination
Solution Approach 2:
The first and second substrates serve multiple functions: they provide structural support for the wavelength conversion layers, facilitate heat dissipation, enable positioning of components, and contribute to the overall optical performance. This multi-functionality reduces device complexity by consolidating multiple functions into fewer components
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 use of quantum dots significantly increases the color purity and uniformity of light emitted, improving the overall picture quality of display devices by efficiently converting light across a narrow wavelength range, thereby enhancing luminance and reducing color stains between adjacent light sources.
Implementation Method 1
Each of the quantum dots may be a nano-size semiconductor material that has a quantum confinement effect. The quantum dot may generate stronger light than phosphor in a narrow wavelength range
Implementation Method 2
The plurality of wavelength conversion layers may comprise quantum dots
Data Source
AI summary
A backlight assembly includes a light source portion including a plurality of light sources. The light sources are configured to emit light. A wavelength conversion member is disposed on the light source portion. The wavelength conversion member is configured to convert a wavelength of light emitted from the light source portion. The wavelength conversion member includes a first substrate disposed on the light source portion, a second substrate disposed on the first substrate, and a plurality of wavelength conversion layers interposed between the first substrate and the second substrate. Each of the plurality of wavelength conversion layers correspond to a light source of the plurality of light sources.