Color Conversion Film Interlayer for Layer Separation and Color Purity
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Solution Overview
Problem
Existing color conversion films in liquid crystal display devices suffer from inadequate color reproducibility, which affects the quality of the displayed images.
Innovation Solution
A color conversion film comprising a support, a first color conversion layer, an interlayer, and a second color conversion layer, where the layers are structured to emit specific wavelength ranges of light and are separated by an interlayer to prevent mixing, with the interlayer containing a water-soluble resin, particularly polyvinyl alcohol and polyvinylpyrrolidone resins, to enhance color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple color conversion layers are used to achieve broad spectrum coverage, then color reproduction capability is improved, but layer mixing occurs causing color contamination
Solution Approach 1:
An interlayer containing water-soluble resin (polyvinyl alcohol or polyvinylpyrrolidone) is introduced between the first color conversion layer and the second color conversion layer. This interlayer acts as a barrier that prevents mixing of adjacent color conversion layers while maintaining transparency to light, thereby eliminating color contamination and improving color reproducibility
Solution Approach 2:
The color conversion film is divided into distinct segmented layers (first color conversion layer, interlayer, second color conversion layer) with clear boundaries. This segmentation prevents interlayer mixing and allows each layer to maintain its specific color emission characteristics independently
2Measurement precision
If an interlayer is added to prevent layer mixing, then color reproducibility is improved, but device complexity increases
Solution Approach 1:
The interlayer is formed as a homogeneous layer containing water-soluble resin without requiring complex multi-component compositions. This simple homogeneous structure achieves the barrier function effectively while minimizing added complexity to the overall film structure
Solution Approach 2:
The interlayer uses inexpensive water-soluble resins (polyvinyl alcohol or polyvinylpyrrolidone) that can be easily applied and processed. Although the interlayer is a permanent structural element, the use of low-cost, readily available materials reduces manufacturing complexity and cost
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 film achieves improved color reproducibility by maintaining the integrity of each layer's color emission, resulting in enhanced image quality and display performance.
Implementation Method 1
a first color conversion layer containing an organic light-emitting material which emits, by an excitation light having a wavelength of 400 nm or more and less than 500 nm, light observed in a region having a peak wavelength of 500 nm or more and less than 580 nm
Implementation Method 2
a second color conversion layer containing an organic light-emitting material which emits, by at least one of the excitation light having a wavelength of 400 nm or more and less than 500 nm or the light emitted from the organic light-emitting material, light observed in a region having a peak wavelength of 580 nm or more and less than 750 nm
Data Source
AI summary
Provided are a color conversion film including, in the following order, a support, a first color conversion layer containing an organic light-emitting material which emits, by an excitation light having a wavelength of 400 nm or more and less than 500 nm, light observed in a region having a peak wavelength of 500 nm or more and less than 580 nm, an interlayer, and a second color conversion layer containing an organic light-emitting material which emits, by at least one of the excitation light having a wavelength of 400 nm or more and less than 500 nm or the light emitted from the organic light-emitting material, light observed in a region having a peak wavelength of 580 nm or more and less than 750 nm; a method for manufacturing a color conversion film, a backlight unit, and a liquid crystal display device.