Four-Dye Absorption Filter for OLED Contrast Without Tint Shift
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Solution Overview
Problem
Existing OLED display devices face issues with external light reflection causing a decrease in contrast and brightness, and existing light absorption filters either fail to suppress brightness loss or cause unwanted changes in image tint.
Innovation Solution
A wavelength selective absorption filter comprising specific dyes A to D with defined absorbance ratios in different wavelength ranges, dispersed in a resin, to minimize external light reflection and maintain original image tint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light absorbing layer containing carbon black pigment and dye is provided to suppress external light reflection, then external light reflection is suppressed, but brightness decreases and image tint changes
Solution Approach 1:
The patent applies local quality by using different dye types (cyan, magenta, yellow) with specific absorption characteristics in different wavelength regions. Each dye absorbs external light in its complementary wavelength range while allowing OLED emission wavelengths to pass through, achieving localized spectral filtering that suppresses reflection without uniformly reducing brightness or altering image tint.
Solution Approach 2:
The invention uses a composite light absorbing layer containing multiple dye components (cyan dye, magenta dye, yellow dye) combined with carbon black pigment. This composite formulation creates a multi-functional material that simultaneously achieves external light reflection suppression, brightness maintenance, and color accuracy preservation through the synergistic absorption properties of different dyes.
2Object-affected harmful factors
If a circularly polarizing plate is provided to suppress external light reflection, then external light reflection is suppressed, but brightness decreases
Solution Approach 1:
The patent changes the optical parameters of the light absorbing layer by precisely controlling dye concentrations and absorption characteristics. By adjusting the density and spectral absorption properties of cyan, magenta, and yellow dyes, the layer achieves selective wavelength absorption that suppresses external light reflection while maintaining high transmittance for OLED emission wavelengths, thus preserving brightness.
3Object-affected harmful factors
If a light absorbing layer with broad absorption spectrum is used to suppress external light reflection, then external light reflection is suppressed, but image tint changes
Solution Approach 1:
The patent applies local quality by using different dye types (cyan, magenta, yellow) with specific absorption characteristics in different wavelength regions. Each dye absorbs external light in its complementary wavelength range while allowing OLED emission wavelengths to pass through, achieving localized spectral filtering that suppresses reflection without uniformly reducing brightness or altering image tint.
Solution Approach 2:
The invention utilizes color changes principles by selecting dyes whose absorption spectra are complementary to the OLED emission spectra. The cyan dye absorbs red external light, magenta dye absorbs green external light, and yellow dye absorbs blue external light, while allowing their respective emission wavelengths to pass through unchanged, thus suppressing reflection without altering the displayed image color.
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 effectively suppresses external light reflection and brightness decrease while preserving the original image tint of OLED displays.
Implementation Method 1
a wavelength selective absorption filter comprising: a resin; and the following dyes A to D each having a main absorption wavelength range in different wavelength ranges
Data Source
AI summary
There are provided a wavelength selective absorption filter including a resin, and four types of dyes A to D each having a main absorption wavelength range in different specific wavelength regions, in which an absorbance Ab (λ) of the wavelength selective absorption filter at a wavelength λ nm satisfies specific Relational Expressions (I) to (VI), and an organic electroluminescent display device.