Color Conversion Film Material for Display Devices
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Solution Overview
Problem
Current liquid crystal display backlights with yellow phosphor and overlapping color filters result in low color purity and gamut, limiting the RGB color representation.
Innovation Solution
A color conversion film material comprising a boron fluoride dipyrrole derivative to absorb cyan light and emit green light, and a rhodamine 101 derivative to absorb yellow-orange light and emit red light, improving heat stability and color gamut while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common yellow phosphor backlights are employed, then the display device can be manufactured with lower costs, but the color gamut of the liquid crystal display becomes low
Solution Approach 1:
The patent uses a composite color conversion film containing both a first compound (absorbing cyan light at 480-510nm) and a second compound (absorbing yellow-orange light at 560-610nm). This composite material approach allows the film to simultaneously convert cyan to green and yellow-orange to red, achieving wide color gamut while maintaining compatibility with cost-effective yellow phosphor backlights
Solution Approach 2:
The patent optimizes the mass ratio parameters of the first and second compounds within specific ranges (0.4-1.6):(0.3-1.7) to achieve optimal color conversion efficiency. By adjusting these compositional parameters, the film achieves high color purity and gamut while maintaining manufacturing feasibility with conventional backlight systems
2Device complexity
If three primary color filters with overlapping areas are used, then the display device can be manufactured with simpler structure, but the purity of the RGB three primary colors becomes low
Solution Approach 1:
The patent applies local quality by using color conversion compounds that selectively absorb specific wavelength ranges (cyan at 480-510nm and yellow-orange at 560-610nm) and convert them to pure green and red light respectively. This localized spectral conversion at specific wavelength bands achieves high color purity without requiring complex multi-layer filter structures
Solution Approach 2:
The patent extracts and eliminates the harmful overlapping wavelength regions by using the color conversion film to absorb cyan and yellow-orange light, removing these unwanted spectral components and replacing them with pure green and red emission, thereby achieving high color purity without complex filtering
3Ease of manufacture
If conventional color conversion materials are used, then the manufacturing process remains simple, but the heat stability of the color conversion film deteriorates
Solution Approach 1:
The patent employs a composite formulation combining first and second color conversion compounds with a dispersion system comprising acrylic resin, acrylic monomer, and photoinitiator. This composite material structure provides both thermal stability and ease of manufacturing through simple coating and UV curing processes
Solution Approach 2:
The patent specifies optimal mass ratio parameters of the compounds to the dispersion system components to achieve both heat stability and manufacturing simplicity. The controlled composition ratios ensure proper dispersion, adhesion, and thermal resistance while maintaining a straightforward manufacturing process
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
Enhances heat stability and color gamut of display devices by using the color conversion film, which absorbs specific light bands to purify and improve light emission, thereby reducing production costs.
Implementation Method 1
a first compound... which is a boron fluoride dipyrrole derivative and absorbs cyan light in a wavelength range of 480 to 510 nm to emit green light
Implementation Method 2
a second compound... which is a rhodamine 101 derivative and absorbs yellow-orange light in a wavelength range of 560 to 610 nm to emit red light
Data Source
AI summary
A color conversion film material, a color conversion film, and a display device are provided. The material of the color conversion film includes a first compound and a second compound, and a mass ratio of the first compound and the second compound is (0.4-1.6):(0.3-1.7). A heat stability of the color conversion film is enhanced by using the color conversion film made of the material of the color conversion film. Moreover, a color gamut of the display device is improved, and costs thereof are reduced by applying the color conversion film to the display device.