Display Device Color Conversion Film with Light Absorption Layer
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Solution Overview
Problem
Existing display devices face challenges in achieving good color rendition and a wide color gamut due to limitations in controlling light emission peaks, particularly with the use of LEDs and quantum dots, which often result in decreased brightness and efficiency.
Innovation Solution
A display device incorporating a liquid crystal panel and a backlight unit with a color conversion film and a light absorption layer, where the color conversion film has specific light emission peaks and the light absorption layer is optimized to enhance both color gamut and brightness by absorbing unnecessary light, thereby improving BT2020 coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used to expand color gamut, then color rendition is improved, but production costs increase and safety issues arise with cadmium-based quantum dots
Solution Approach 1:
The patent changes the material composition parameters by replacing cadmium-based quantum dots with non-cadmium alternatives (such as InP or carbon dots), thereby maintaining the color gamut expansion function while eliminating safety and cost issues associated with toxic materials
Solution Approach 2:
The patent employs cost-effective non-cadmium quantum dot materials that are safer and more environmentally friendly, replacing expensive and hazardous cadmium-based materials while achieving the same optical performance
2Ease of manufacture
If traditional phosphor mixing methods are used, then production is simple, but color control is difficult and color gamut deteriorates
Solution Approach 1:
The patent segments the color generation process by using separate quantum dot layers or regions that emit specific wavelengths (red, green, blue), replacing the mixed phosphor approach. This segmentation enables precise color control while maintaining relatively simple manufacturing processes
Solution Approach 2:
The patent uses composite material structures combining quantum dots with polymer matrices or other supporting materials, achieving both precise color control through quantum dot size/composition tuning and ease of manufacture through solution processing techniques
3Object-affected harmful factors
If non-cadmium quantum dots are used to replace cadmium-based quantum dots, then safety is improved, but efficiency significantly deteriorates
Solution Approach 1:
The patent optimizes parameters such as quantum dot size, composition ratio, and shell thickness to maximize quantum efficiency of non-cadmium materials, bringing their performance close to or comparable with cadmium-based quantum dots while maintaining safety advantages
Solution Approach 2:
The patent replaces the core material composition (cadmium) with alternative materials (InP, carbon dots) that have different electronic structures but can be engineered to achieve similar or better optoelectronic efficiency through proper design and synthesis
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 effectively enhances both color gamut and brightness while maintaining high BT2020 coverage, outperforming traditional methods that often sacrifice brightness for increased color gamut.
Implementation Method 1
the color conversion film includes, during light irradiation, a first light emission peak in which a light emission peak having the largest height within a wavelength range of 500 nm to 560 nm is present within 520 nm to 535 nm and a full width at half maximum of the light emission peak is 50 nm or less and a second light emission peak in which a light emission peak having the largest height within a wavelength range of 600 nm to 780 nm is present within 625 nm to 640 nm and a full width at half maximum of the light emission peak is 60 nm or less
Implementation Method 2
the light absorption layer has a maximum absorption wavelength at 560 nm to 610 nm
Data Source
Figure 1~3
Figure 4
AI summary
The present specification relates to a display device including: a liquid crystal panel; and a backlight unit, in which the backlight unit includes one or more color conversion films, the liquid crystal panel or backlight unit includes a light absorption layer, and the color conversion film includes, during light irradiation, a first light emission peak in which a light emission peak having the largest height within a wavelength range of 500 nm to 560 nm is present within 520 nm to 535 nm and a full width at half maximum of the light emission peak is 50 nm or less and a second light emission peak in which a light emission peak having the largest height within a wavelength range of 600 nm to 780 nm is present within 625 nm to 640 nm and a full width at half maximum of the light emission peak is 60 nm or less.