Wavelength Selective Absorption Filter for Blue Light Reduction
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Solution Overview
Problem
Current optical filters used in image display devices, such as OLED and liquid crystal displays, either fail to sufficiently reduce blue light emission, leading to eye strain, or cause a decrease in relative brightness and a change in tint, compromising both eye protection and visual quality.
Innovation Solution
A wavelength selective absorption filter comprising a resin and specific dyes A and D, with main absorption bands at 400-430 nm and 640-730 nm respectively, is used to effectively cut blue light while maintaining excellent correlated color temperature and relative brightness, by adjusting the absorbance ratio to satisfy a specific relational expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an optical filter containing a coloring agent with an absorption maximum near 430 nm is used to cut blue light, then blue light cutting function is improved, but a change in tint occurs
Solution Approach 1:
The patent divides the blue light absorption function into two separate coloring agents: one responsible for cutting blue light (absorption maximum near 430 nm) and another responsible for maintaining color temperature (absorption maximum near 620 nm). This segmentation allows each agent to perform its specific function without interfering with the other, thereby achieving both blue light cutting and color temperature maintenance simultaneously
Solution Approach 2:
The patent uses a composite optical filter containing both a first coloring agent (for blue light cutting) and a second coloring agent (for color temperature maintenance). This composite approach combines the beneficial properties of both individual agents while mitigating their respective drawbacks, achieving a balanced performance in both blue light reduction and color quality preservation
2Object-affected harmful factors
If a shield film is used to reduce harmful light radiation, then eye protection function is improved, but relative brightness decreases
Solution Approach 1:
The patent applies local quality by making different parts of the optical filter have different absorption characteristics. The first coloring agent is specifically positioned to absorb harmful blue light wavelengths, while the second coloring agent is positioned to maintain overall color temperature and brightness. This localized functional differentiation allows the filter to protect against harmful radiation without uniformly dimming the entire spectrum
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 solution achieves both excellent blue light cutting and correlated color temperature while preventing a decrease in relative brightness, ensuring improved eye protection and visual performance for image display devices.
Implementation Method 1
a wavelength selective absorption filter comprising a resin; and the following dye A and dye D, each of which has a main absorption wavelength band in a different wavelength range... an absorbance Ab (k) at a wavelength k nm of this wavelength selective absorption filter satisfies a relationship
Implementation Method 2
the dye A: a dye having a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 400 to 430 nm... the dye D: a dye having a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 640 to 730 nm
Data Source
AI summary
Provided are a wavelength selective absorption filter including a resin and the following dye A and dye D, each of which has a main absorption wavelength band in a different wavelength range, in which an absorbance Ab (λ) at a wavelength λ nm of this wavelength selective absorption filter satisfies a relationship of the Relational Expression (I) 0.05<Ab (450)/Ab (430)<1.00, as well as a polarizing plate and an organic electroluminescent display device or liquid crystal display device including the wavelength selective absorption filter. The dye A is a dye having a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 400 to 430 nm. The dye D is a dye having a main absorption wavelength band in the wavelength selective absorption filter at a wavelength of 640 to 730 nm.