Color Filter with Narrow Absorption Spectrum for Display Gamut
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Solution Overview
Problem
Liquid crystal displays using blue LEDs and conventional color filters face challenges in achieving high color purity and gamut due to the emission spectrum of red and green lights, which affects the color tone and gamut, necessitating improved filtering solutions.
Innovation Solution
Incorporating a color correction material with a narrow absorption spectrum, specifically metal phthalocyanine derivatives, subphthalocyanine, BODIPY, indigoid, and acene bisimide, into the color filters to selectively absorb intermediate wavelengths, thereby enhancing color purity and gamut by filtering out specific wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional color filters are used in liquid crystal displays, then the display can show colors, but the color purity and gamut are limited due to the emission spectrum of red and green lights
Solution Approach 1:
The patent divides the color filtering function into multiple segments: conventional color filters for primary color separation and additional color correction filters for purifying specific wavelength ranges. This segmentation allows each filter to specialize in correcting specific color issues, achieving higher overall color purity without requiring a complete redesign of the filtering system
Solution Approach 2:
The patent combines conventional color filter materials with color correction materials having narrow absorption spectra. This composite filtering approach integrates the broad-spectrum filtering capability of conventional filters with the selective wavelength purification of correction materials, resolving the contradiction between color purity and device complexity
2Quantity of substance
If the emission spectrum of green light is broad, then more green wavelengths are available, but color purity decreases and influences color gamut and tone
Solution Approach 1:
The patent extracts and removes the problematic intermediate wavelength components from the green light spectrum using color correction filters with narrow absorption bands. These correction filters selectively absorb specific wavelength ranges within the green spectrum, extracting only the purer green wavelengths needed for high-color-purity display while discarding the impurity wavelengths that harm color gamut
3Illumination intensity
If the emission spectrum of red light includes longer wavelengths, then more red light is emitted, but these wavelengths can't be easily detected by human eye and reduce color purity
Solution Approach 1:
The patent applies color correction filters with specifically designed narrow absorption spectra tailored to each color channel's unique purity issues. For the red channel, correction filters are designed to target and remove only the specific longer wavelength components that fall outside human detection range, maintaining local optimization for red color purity without affecting overall red light emission intensity
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 these color correction materials results in a narrower full width at half maximum (FWHM) emission spectrum, leading to higher color purity and a wider color gamut, improving the overall color tone and durability of liquid crystal displays.
Implementation Method 1
a wavelength interval of absorption spectrum of the color correction material with a visible light absorption rate smaller than 0.2 is from 150 to 180 nanometers
Data Source
AI summary
A color filter and a display panel, wherein the color filter includes a color correction material. In an absorption spectrum of the color correction material, a wavelength interval of the absorption spectrum with a visible light absorption rate smaller than 0.2 is from 150 to 180 nanometers.