Halogen-Free Green Color Filter for High Transmittance
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Solution Overview
Problem
Conventional green color filters in liquid crystal display panels have high halogen content, which is environmentally detrimental, and existing halogen-free alternatives fail to achieve sufficient transmittance for high luminance and color saturation.
Innovation Solution
A halogen-free green color filter with a halogen concentration less than 10 ppm, utilizing a mixture of green and yellow pigments such as azo metal complexes and phthalocyanine series pigments, optimized to achieve a peak intensity between 0.33 and 0.4 in the transmittance spectrum when combined with the International Commission on Illumination's color matching function, enhancing transmittance without using harmful halogens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional green color filters with high halogen content are used, then transmittance and color filtering performance are improved, but environmental protection is compromised
Solution Approach 1:
The patent changes the chemical composition parameters of the green color filter by using alternative pigments (C.I. Pigment Green 58 and C.I. Pigment Yellow 150) with specific molecular structures that do not contain halogen atoms, while adjusting their weight ratios (60-90% green pigment, 10-40% yellow pigment) to achieve the required optical performance without halogen content
Solution Approach 2:
The patent employs a composite pigment system combining organic green pigment (azo metal complex) and organic yellow pigment (phthalocyanine series), where the synergistic effect of these two pigments produces the desired green color filtering performance and high transmittance without relying on halogen-containing compounds
2Object-affected harmful factors
If halogen-free green color filters are used, then environmental protection standards are met, but transmittance and color saturation are reduced
Solution Approach 1:
The patent optimizes the molecular structure parameters of the pigment molecules and their weight ratio parameters to enhance light absorption in the cyan region (480-520nm) while maintaining high transmittance in the green region (520-560nm), achieving peak intensity of G(λ)×CMF_Z(λ) between 0.33-0.40 without halogen content
Solution Approach 2:
The patent utilizes the color mixing principle by combining green pigment and yellow pigment in specific proportions, where the yellow pigment compensates for the limited color saturation of the halogen-free green pigment alone, achieving full color display capability through spectral manipulation
3Object-affected harmful factors
If halogen-free green color filters are used, then environmental protection standards are met, but color saturation is reduced
Solution Approach 1:
The patent creates a composite color filter system using two different organic pigment compounds with complementary absorption characteristics, where C.I. Pigment Green 58 provides the primary green filtering and C.I. Pigment Yellow 150 enhances the color saturation by absorbing in the blue-cyan region, together achieving full color display performance without halogen
Solution Approach 2:
The patent adjusts the molecular structure parameters of the pigment molecules (specific chemical formulas with metal complexes) and their concentration parameters (weight ratios between 60-90% green and 10-40% yellow) to optimize the transmission spectrum shape, achieving peak intensity of 0.33-0.40 for G(λ)×CMF_Z(λ) that ensures high color saturation
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 halogen-free green color filter achieves improved transmittance and color saturation, meeting environmental protection standards while maintaining high luminance, thus enhancing the overall performance of liquid crystal display panels.
Implementation Method 1
The green color filter has a transmittance spectrum G(λ), and a peak intensity between 380 nm and 780 nm of G(λ)×CMF_Z(λ) is in a range between 0.33 and 0.4
Data Source
AI summary
A display device and color filter substrate thereof are provided. The color filter substrate includes a substrate and a green color filter disposed on the substrate. A concentration of halogen in the green color filter is less than 10 ppm. The green color filter has a transmittance spectrum G(λ), and CMF_Z(λ) is the color matching function defined by International Commission on Illumination (CIE). A peak intensity between 380 nm and 780 nm of G(λ)×CMF_Z(λ) is in a range between 0.33 and 0.4.