Wavelength-Selective Absorption Filter for Wide Color Gamut Brightness
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Solution Overview
Problem
Existing wavelength selective absorption filters and color filters in liquid crystal and organic electroluminescent display devices fail to achieve sufficient color reproducibility and brightness while meeting NTSC and DCI-P3 standards, with issues such as tint changes and significant brightness decreases.
Innovation Solution
A wavelength selective absorption filter comprising a resin and dyes A and C with specific absorption bands at 400-450 nm and 560-600 nm, respectively, without fluorescence, to adjust chromaticity and block unnecessary wavelengths, enhancing color gamut coverage and suppressing brightness loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color filters are used to block unnecessary wavelengths, then color reproducibility is improved, but brightness decreases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the filter by using specific dyes (cyanine-based dye for 400-450nm band and squarylium-based dye for 560-600nm band) with defined absorption characteristics. This allows selective blocking of unnecessary wavelengths while maintaining transmission of useful light, achieving NTSC 100% and DCI-P3 95% color gamut coverage without significant brightness loss
Solution Approach 2:
The patent combines multiple dye components in a composite filter structure - specifically cyanine-based dye and squarylium-based dye with specific absorption bands. This composite approach enables simultaneous achievement of wide color gamut coverage and high brightness by coordinating the absorption characteristics of different dye components
2Object-generated harmful factors
If absorption dyes with broad absorption bands are used, then unnecessary wavelengths are blocked, but color purity deteriorates due to tint changes
Solution Approach 1:
The patent applies local quality by assigning specific absorption responsibilities to different dye components - the cyanine-based dye specifically targets the 400-450nm blue region while the squarylium-based dye targets the 560-600nm orange region. This localized absorption approach prevents unwanted tint changes while maintaining color purity in the displayed RGB colors
Solution Approach 2:
The patent precisely controls the absorption band parameters of each dye component, ensuring the cyanine-based dye absorbs at 400-450nm and the squarylium-based dye absorbs at 560-600nm. This parameter optimization allows effective blocking of unnecessary wavelengths without affecting the purity of the displayed colors
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 filter achieves excellent color reproducibility and minimizes brightness decrease, improving color gamut coverage for both NTSC and DCI-P3 standards by adjusting chromaticity without significant brightness loss.
Implementation Method 1
the dye A: a dye having a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 400 to 450 nm
Implementation Method 2
the dye C: a dye having a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 560 to 600 nm
Data Source
AI summary
Provided are a wavelength selective absorption filter containing a resin and a dye A, which has a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 400 to 450 nm, and a dye C, which has a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 560 to 600 nm, each of which has a main absorption wavelength band in a different wavelength range, as well as a polarizing plate and an organic electroluminescent display device or liquid crystal display device, which include the wavelength selective absorption filter. However, the dye A and the dye C do not have fluorescence.