Display Substrate Light Modulation Layer Blue Light Reduction
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Solution Overview
Problem
Current display technologies, such as LCDs and OLEDs, emit blue light that can cause photochemical damage to the retina, particularly affecting children's eyes, due to its high energy and ability to penetrate the cornea and lens, leading to potential vision loss from prolonged exposure.
Innovation Solution
A display substrate is designed with a light-emitting unit layer and a reflective layer having light transmission holes, combined with a light modulation layer that reflects blue light and transmits other wavelengths, using a metal-oxide or metal-compound composite structure to form a colored mirror display, reducing blue light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display structure without light modulation layer is used, then the display brightness and mirror effect are maintained, but blue light emission causes photochemical damage to the retina
Solution Approach 1:
The light modulation layer is divided into multiple sub-layers with alternating high and low refractive indices, where each sub-layer has a specific thickness designed to reflect blue light wavelengths while allowing other wavelengths to pass through. This segmented structure enables selective wavelength modulation without compromising overall display brightness.
Solution Approach 2:
The light modulation layer uses composite material structure with alternating layers of different refractive indices (high refractive index material and low refractive index material), creating a multi-layer composite that selectively reflects blue light while maintaining transmission of other wavelengths, thus protecting against blue light damage without reducing display brightness.
2Object-affected harmful factors
If a light modulation layer is added to reflect blue light, then blue light emission is reduced, but the device structure becomes more complex
Solution Approach 1:
The light modulation layer serves multiple functions simultaneously: it reflects blue light to protect against retinal damage, maintains display brightness through controlled transmission, and integrates with the existing display substrate structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If the light modulation layer reflects blue light, then blue light transmission is reduced, but transmission of other wavelengths must be maintained for display quality
Solution Approach 1:
The light modulation layer exhibits local quality by having different optical properties for different wavelengths: it reflects blue light wavelengths (480-500nm) while maintaining high transmission for other wavelengths (red, green, and other visible spectrum). This wavelength-selective property is achieved through precise control of sub-layer thicknesses and refractive indices, ensuring that blue light is blocked while other colors pass through to maintain display quality.
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 blue light emission while maintaining display brightness and contrast, protecting eyes and reducing power consumption, with minimal process complexity and cost, ensuring high transmission, wide viewing angles, and flexibility.
Implementation Method 1
the first refractive index layer and the second refractive index layer in the plurality of sub-layers are alternately arranged
Implementation Method 2
a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index
Data Source
AI summary
A display substrate and a preparation method therefor, and a display apparatus. The display substrate includes a light-emitting unit layer arranged on a base, and a reflecting layer arranged on the light-emitting unit layer, wherein the light-emitting unit layer comprises a plurality of light-emitting units corresponding to different colors, and the reflecting layer is provided with light transmission holes corresponding to the plurality of light-emitting units on a one-to-one basis; and a light modulation layer is arranged on the side of the reflective layer away from the base, and the light modulation layer is configured to reflect some light rays in a blue light waveband and transmit light rays in wavebands other than the blue light waveband.