Blue Light Filtering Layer in Array Substrates
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Solution Overview
Problem
Existing liquid crystal display backlights emit high-energy, short-wave blue light that can harm human eyes, and previous solutions like anti-blue light radiation lenses are complex, absorb too much blue light, and affect display quality.
Innovation Solution
An array substrate with a blue light filtering layer, comprising semiconductor nano particles like carbon-doped titanium dioxide or tungsten oxide and silicon dioxide, is integrated into the light-transmission region to absorb blue light with a wavelength smaller than 450 nm, reducing harmful blue light without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-blue light radiation lens is used to filter blue light, then harmful blue light radiation is reduced, but the film structure becomes complicated and processing difficulty increases
Solution Approach 1:
The patent extracts only the essential blue light filtering function from the complex anti-blue light radiation lens structure. By using a simple blue light filtering layer containing semiconductor nanoparticles, it isolates and implements only the wavelength-selective absorption capability, eliminating the need for complicated multi-layer film structures while maintaining effective blue light radiation reduction.
Solution Approach 2:
The patent applies local quality by positioning the blue light filtering layer specifically in the light-transmission region of the display device. This localized placement ensures that blue light filtering is applied only where light passes through, rather than throughout the entire device structure, thereby reducing overall complexity while maintaining effectiveness in the critical optical path.
2Object-affected harmful factors
If anti-blue light radiation lens absorbs blue light in a large wavelength range, then harmful blue light is reduced, but display quality and visual experience are affected
Solution Approach 1:
The patent employs local quality by designing the blue light filtering layer to selectively absorb only specific wavelengths of blue light (high-energy short-wave blue light) while allowing other wavelengths to pass through. This wavelength-selective filtering maintains display quality by preserving the blue color component necessary for visual experience while eliminating only the harmful portion of the blue light spectrum.
Solution Approach 2:
The patent applies parameter changes by utilizing the optical properties of semiconductor nanoparticles, whose light absorption characteristics can be precisely controlled by adjusting their size and composition. By optimizing these parameters, the filtering layer achieves selective absorption of harmful blue light wavelengths while maintaining transmission of beneficial wavelengths, thus preserving display quality.
3Illumination intensity
If conventional white light LED with phosphorous powder is used, then white light is produced, but harmful blue light with wavelength between 430 nm and 450 nm is emitted
Solution Approach 1:
The patent introduces a blue light filtering layer as an intermediary component between the white light LED source and the user's eyes. This intermediary layer selectively absorbs harmful blue light wavelengths while allowing the rest of the white light spectrum to pass through, thus maintaining white light output while eliminating the harmful blue light component that would otherwise reach the user.
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 effectively reduces harmful blue light radiation while maintaining the display quality by selectively absorbing blue light in a narrower wavelength band, improving eye protection without affecting the visual experience.
Implementation Method 1
the blue light filtering layer is configured to absorb blue light with a wavelength smaller than 450 nm
Data Source
AI summary
An array substrate, a method for manufacturing the same, a display panel and a display device are disclosed, for reducing the amount of harmful blue light in a backlight without influencing the display quality of the product. The array substrate comprises a light-transmission region and a non-transmission region, and the light-transmission region is provided with a blue light filtering layer configured to absorb blue light with a wavelength smaller than 450 nm (FIG. 1).